AEROSPACE
MATERIAL
SPECIFICATION
AMS 2770H
Issued
Revised
JUN 1974
AUG 2006
Superseding AMS 2770G
Heat Treatment of Wrought Aluminum Alloy Parts
RATIONALE
AMS 2770H represents a technical revision of this specification.
1. SCOPE
1.1
Purpose
This specification specifies the engineering requirements for heat treatment, by part fabricators (users) or their vendors or
subcontractors, of parts (See 8.8.1). It also covers heat treatment by warehouses or distributors converting raw material
from one temper to another temper (See 1.3 and 8.5). It covers the following aluminum alloys:
1100, 2004, 2014, 2017, 2024, 2098, 2117, 2124, 2219, 2224, 3003, 5052, 6013, 6061, 6063, 6066, 6951, 7049, 7050,
7075, 7149, 7178, 7249, 7475
1.1.1
This specification may be used for heat treatment of parts made from other alloys provided the temperature,
temperature uniformity tolerances, times, and quenchants are specified or approved by the cognizant engineering
organization (See 8.8.9).
1.2
Castings and parts made from castings shall be heat treated in accordance with AMS 2771.
1.3
Temper Conversion
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
When a warehouse, distributor or similar organization converts raw material to a different temper, it shall be heat treated
and tested to the requirements of this specification. The marking, testing and reporting requirements shall also be in
accordance with AMS 2772 and the raw material specification.
2. APPLICABLE DOCUMENTS
The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the
extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue
is specified. When the referenced document has been cancelled and no superseding document has been specified, the
last published issue of that document shall apply.
2.1
SAE Publications
Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside
USA and Canada) or 724-776-4970 (outside USA), or www.sae.org.
AMS 2658
AMS 2750
Hardness and Conductivity Inspection of Wrought Aluminum Alloy Parts
Pyrometry
SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely
voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”
SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.
Copyright © 2006 SAE International
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,
recording, or otherwise, without the prior written permission of SAE.
TO PLACE A DOCUMENT ORDER:
Tel:
877-606-7323 (inside USA and Canada)
Tel:
724-776-4970 (outside USA)
Fax:
724-776-0790
Email: [email protected]
http://www.sae.org
Copyright SAE International
Provided
IHS under
license with SAE
SAE by
WEB
ADDRESS:
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
AMS 2771
AMS 2772
AMS 3025
Heat Treatment of Aluminum Alloy Castings
Heat Treatment of Aluminum Alloy Raw Materials
Polyalkylene Glycol Heat Treat Quenchant
ARP1962
Training and Approval of Heat-Treating Personnel
2.2
-2-
ASTM Publications
Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,
Tel: 610-832-9585, or www.astm.org.
ASTM D 445
Kinematic Viscosity of Transparent and Opaque Liquids (and the Calculation of Dynamic
Viscosity)
3. TECHNICAL REQUIREMENTS
3.1
Equipment
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
3.1.1
Pyrometry
Shall conform to AMS 2750.
3.1.1.1
Solution heat treating furnaces shall be a minimum of Class 2 (±10 °F or ±6 °C).
3.1.1.2
AMS 2750 furnace classifications for aging shall be as follows:
3.1.1.2.1
Aging ovens operating at or below 300 °F (149 °C) shall be a minimum of Class 2 (±10 °F or ±6 °C).
3.1.1.2.2
For alloys 7049, 7149, 7249 and 7050, aging ovens or aging furnaces operating above 300 °F shall be a
minimum of Class 1 (±5 °F or ±3 °C).
3.1.1.2.3
For aging all other alloys, all ovens or furnaces operating above 300 °F (149 °C) shall be a minimum of Class
2 (±10 °F or ±6 °C).
3.1.1.3
3.1.2
Annealing and stress relieving furnaces shall be a minimum of Class 5 (±25 °F or ±14 °C).
Furnaces
3.1.2.1
Heating Media
Shall be air, molten salt bath, oil bath, or fluidized bed. The products of combustion and other materials that could
contaminate parts shall not come into contact with parts during solution heat treating, annealing or stress relieving.
Electrical heating elements and radiant tubes shall be shielded to prevent parts from being exposed to direct radiation.
Shield construction and placement shall be such as to prevent parts from being exposed to re-radiation of heat from
electrical elements or radiant tubes. Composition and maintenance of salt baths and fluidized beds shall be such as to
prevent attack of the parts.
3.1.2.2
Temperature Uniformity Test Recovery Requirements (See 8.8.11)
For all solution heat treat and aging furnaces, the lag time between recovery of the first test thermocouple and the last test
thermocouple to within 10 °F (6 °C), or 5 °F (3 °C) as applicable, of the set temperature during furnace uniformity tests
shall not exceed the following:
3.1.2.2.1
Furnaces Tested Without a Load
20 minutes.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
3.1.2.2.2
-3-
Furnaces Tested With a Load
40 minutes.
3.1.2.3
Furnaces Used for Alclad Material
Heat input of furnaces used for solution heat treating of parts made from alclad product shall be sufficient to ensure
conformance to 3.3.4.
3.1.3
Racks and Fixtures
Shall be constructed so as to preclude entrapment of water, molten salt and/or water/polymer solutions.
3.1.4
Quenching Equipment
3.1.4.1
Equipment shall be provided for quenching in water, and/or water/polymer solutions, and for measuring
quenchant temperature. Provisions shall be made for mechanical or hydraulic agitation of the quenching
medium and/or agitation of the parts and for heating and cooling of the quenchant, as necessary to conform to
3.4.2 and 3.4.3. Air agitation shall not be used.
3.1.4.2
Quench tanks shall be located in proximity to solution heat treating furnaces so that the quench delay
requirements of Table 5 can be met.
3.1.4.3
The quenchant volume shall be sufficient to prevent the quench tank temperature from rising more than
permitted in 3.4.3 during quenching with a maximum load.
3.1.5
Refrigeration Equipment
Refrigerators, dry ice boxes, or liquid baths shall be provided for cold storage of parts when retention of the as-quenched
(AQ) temper is required. Refrigerators, dry ice boxes with fans and liquid baths shall be equipped with a temperature
recorder. Refrigerators shall be capable of temperature recovery to within 5 °F (3 °C) of the set temperature within twenty
minutes of door closing after insertion or removal of parts.
3.2
General Procedures
3.2.1
Parts requiring a heat treatment to produce a final “T” temper shall be solution heat treated (including quenching),
refrigerated when necessary, and aged when required, as specified herein (See 8.8.1). Heat treatment shall be
performed only on entire parts, never on a portion or section of a part.
3.2.2
Cleaning
Prior to solution heat treating or annealing, parts shall be clean and visually free of contaminants such as dirt, metal
residues, lubricants and solvent residues. Residue from heating and quenching media shall be removed from parts after
any heat treatment step.
3.2.3
Racking and Spacing
3.2.3.1
3.2.3.1.1
Parts, except rivets and other small parts (See 3.2.3.2), shall be racked or supported to permit free access of
the heating and quenching media to all surfaces of parts in all portions of the load.
Solution Heat Treating
Parts, 0.250 inch (6.35 mm) and under in nominal thickness, shall be separated by not less than 1 inch (25 mm). Thicker
parts shall be separated by at least 1 inch (25 mm) plus the part thickness. (Complex parts and parts of large plan form
(See 8.8.12) may require greater separation.)
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
3.2.3.1.2
-4-
Aging, Annealing and Stress Relieving
Parts shall be separated by not less than 1 inch (25 mm) except thin parts may be nested providing thickness of nested
stacks does not exceed 1 inch (25 mm) and stacks are at least 1 inch (25 mm) apart.
3.2.3.2
Rivets and Other Small Parts
3.2.4
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
May be heated and soaked in baskets or in continuous furnaces. Arrangement in baskets may be either orderly or
random. Parts may touch but shall not be nested; free access of the quench media to most surfaces must be maintained.
Maximum thickness of layers of rivets or parts in baskets, and minimum space between layers, shall be 2 inches (51 mm).
Salt Entrapment
Parts that can entrap salt shall be racked so as to preclude salt entrapment. If salt entrapment cannot be precluded, parts
shall not be solution heat treated in a salt bath.
3.2.5
Soaking
3.2.5.1
Start of Soaking Time
Soaking time starts when all temperature control sensors reach the minimum of the uniformity tolerance range specified in
3.1.1.1, 3.1.1.2, or 3.1.1.3, as applicable. Load sensors should not be used to determine start of soaking time. (See 8.3)
3.2.5.2
Soaking Times
The minimum soaking time shall be based on furnace control sensor(s) and, for solution heat treating, shall conform to
Table 3 based on the thickness (minimum dimension of the heaviest section) at the time of heat treatment (See 8.4). The
minimum soaking times for the second step of 7475 solution heat treatment are fifteen minutes for alclad and sixty
minutes for bare product. For all alclad products, the maximum soaking time is ten minutes longer than the minimum.
3.2.5.3
Interruptions
During solution heat treatment, soaking shall be performed without interruption. During aging, annealing, stress relieving,
and heat treatment to the O1 (formerly T411) temper, a maximum of four interruptions, with doors open for not more than
two minutes during each, is permissible for removal or loading of parts. Door opening durations greater than two minutes
are permitted provided the time between the door opening and recovery of furnace temperature is not included in the total
time.
3.3
Solution Heat Treating - Heating and Soaking
3.3.1
Temperature
Parts that require solution heat treatment shall be soaked at the temperature specified in Table 2.
3.3.2
Furnace Temperature Stabilization
3.3.2.1
For air furnace loads where the previous load was at a higher set temperature, or the prior temperature
uniformity test was in a loaded furnace, furnaces shall be stabilized at the new set temperature before loading
parts.
3.3.2.2
If the prior temperature uniformity test was in an unloaded furnace, furnace loads of non-clad material may be
loaded in a cold furnace or furnace whose previous set temperature was below the new set temperature.
3.3.2.3
For parts made from alclad material, furnaces shall be stabilized at the set temperature before loading parts.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
SAE
3.3.3
AMS 2770H
-5-
Prevention of Hydrogen Induced Porosity
Entrapped water shall be prevented from entering the furnace. Ammonium fluoborate, or equivalent, should be used in air
furnaces as necessary, however, purging the furnace with fresh air may be necessary to prevent discoloration of
subsequent loads of parts made from alclad product.
3.3.4
Recovery Time for Alclad Parts
For solution heat treating of parts made from alclad product under 0.125 inch (3.18 mm) thick, the furnace recovery time
shall not exceed 30 minutes and for parts made from heavier Alclad product, shall not exceed 60 minutes.
3.3.5
Multiple Solution Heat Treatments of Alclad Product
Parts made from product over 0.125 inch (3.18 mm) in nominal thickness shall be limited to two solution heat treatments
in addition to any by the material producer. Parts made from product 0.020 to 0.125 inch (0.51 to 3.18 mm) in nominal
thickness, shall be limited to one additional solution heat treatment in addition to any by the raw material producer. For
parts made from product under 0.020 inch (0.51 mm) in nominal thickness, additional solution heat treatments are
prohibited.
3.4
Solution Heat Treating - Quenching
3.4.1
Following completion of the required soaking, parts shall be quenched by immersion in water or in a
water/polymer solution conforming to the requirements of Table 4, except where the use of alternate quenched
media is allowed for 6xxx series alloy parts per 3.4.6. Parts are in the AQ (as-quenched) temper immediately after
quenching (See 8.8.7).
3.4.2
Quenchant Temperature
At the start of quench, quenchant temperature shall not exceed 90 °F (32 °C) except when water quenching parts made
from forgings. When quenching parts made from forgings, the start of quench water temperature shall conform to Table 1.
TABLE 1 - QUENCHING TEMPERATURE FOR FORGINGS
Alloy
2014
2024, 2219, 6061, 7075
7049, 7149, 7249, 7050
3.4.3
Quenching Temperature
150 to 180 °F (66 to 82 °C)
140 to 160 °F (60 to 71 °C)
130 to 160 °F (54 to 71 °C)
Temperature Rise of Quenchant During Quenching
The quenchant temperature shall not exceed the maximum start-of-quench temperature specified in 3.4.2 by more than
10 °F (6 °C) at any time during quenching. In addition, the quenchant temperature shall not increase more than 25 °F
(14 °C) from the starting temperature as a result of quenching any single load.
3.4.4
Quench Delay Times
Shall conform to Table 5.
3.4.5
Agitation
Parts and/or quenchant shall be agitated during quenching. For thin, parts (minimum dimension in heaviest section is
under 0.105 inch (2.67 mm), movement into the quenchant during immersion is sufficient agitation.
3.4.6
Quenchants Other Than Water or Water/Polymer Solutions for 6061, 6063, 6066 and 6951 Alloy Parts
Thin parts under 0.125 inch (3.18 mm) in nominal thickness, made from 6061, 6063, 6066 and 6951 alloys, may be
quenched in an air blast, water spray or fog, providing that the quality assurance provisions specified herein are
supplemented by tensile and hardness tests as specified in 4.3.1.2.2.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
3.4.7
-6-
Immersion Time
Parts racked or in baskets shall be kept immersed in the quenchant for not less than one minute per inch (25.4 mm) of
maximum thickness, or fraction thereof, or for not less than one minute after all evidence of boiling ceases, whichever is
longer. Sheet metal parts less than 0.125 inch (3.18 mm) thick may be removed from the quenchant as soon as all boiling
ceases.
3.4.8
When water quenching from a salt bath, if the water quench tank does not have an overflow system to preclude
salt build-up in the quench tank, parts shall be rinsed in fresh water to preclude the possibility of salt residue on
parts.
3.4.9
Water/Polymer Solutions
Water/polymer solutions shall conform to AMS 3025, Type 1 or Type 2. Concentrations shall comply with Table
4. The pH of water/polymer solutions shall be maintained between 7.5 and 8.7.
3.4.9.2
After quenching into a water/polymer solution, parts shall be thoroughly rinsed with fresh water to remove the
residual polymer.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
3.4.9.1
3.4.9.3
Polymer Concentration Control
3.4.9.3.1
Test Methods
Determination of concentration shall be based on tests of viscosity (in accordance with ASTM D 445) or by refractive
index using a refractometer, e.g. °Brix, glycol coolant, salinity, specific gravity, Abbe, etc., calibrated in accordance with
3.4.9.3.6. A refractometer scaled in °Brix is preferred.
3.4.9.3.2
Test Frequency
Concentration shall be determined quarterly by viscosity. In addition, concentration shall be determined weekly, and when
concentration is changed, by viscosity or refractive index.
3.4.9.3.3
3.4.9.3.3.1
When refractometer concentration measurement is made, the concentration of the tank shall be recorded as
the value determined by the corrected refractive index measurement (See 3.4.9.3.6).
Quenchants Used With Salt Bath Furnaces
When a refractometer is used, and a test of the quenchant shows that its salt content has changed by 1% or more since
the last viscosity test, a new multiplying factor shall be determined (See 3.4.9.3.6.3) . Determination of the new multiplying
factor shall be based on a new viscosity test or calibration against solutions of similar concentration in accordance with
3.4.9.3.4.
3.4.9.3.4
When a viscosity concentration measurement is taken, the reading shall be compared to the corrected
refractive index concentration measurement (See 3.4.9.3.6) taken on the same sample. For the purpose of
comparison, the viscosity value and refractive index value shall be rounded to the nearest 0.5% polymer
concentration. If the concentration value of the two measurements differ by 2% or less, the concentration of
the tank shall be recorded as the value determined by the refractive index measurement. If the rounded
corrected concentration values of the two measurements differ by more than 2%, the reasons for the variance
shall be determined and corrective action taken.
3.4.9.3.5
Equipment
3.4.9.3.5.1
Refractometers use for determination of concentration shall be temperature compensating, and of a range
suitable for the concentration being measured.
3.4.9.3.5.2
Refractometers, when checked against standards, shall have a measurement accuracy of ± 0.5% polymer
or ± 0.3° Brix as applicable, with a scale resolution or minimum indication of ± 0.2° Brix (or equivalent).
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
3.4.9.3.6
-7-
Calibration of Refractometers
3.4.9.3.6.1
Refractometers shall be calibrated at 90-day intervals. The method of calibration shall be documented, and
a seal stating the date of calibration shall be affixed to the refractometer.
3.4.9.3.6.2
Method A
Refractometers may be calibrated against prepared polymer solutions of known composition. The calibration solutions
may be prepared either by a volumetric or a weight method. Calibration points shall bracket each concentration and shall
be within 2% of the tank concentration to be measured. The tank concentration shall be determined by adjusting the
refractometer reading according to a calibration factor, curve or table resulting from the calibration.
3.4.9.3.6.3
Method B
Refractometers may be calibrated against known refractive index standards. These standards can be created using
carefully weighed amounts of sucrose in water. Alternatively, NIST traceable refractive index standards can be purchased
(such as °Brix or refractive index prisms). Three points (zero, midpoint and span of the refractometer) are required.
Concentration of either AMS 3025 Type 1 or Type 2 polyalkalene glycol (PAG) is determined by dividing the reading on
the refractometer by the concentration of the same sample determined by viscosity. This multiplying factor is then applied
to subsequent concentration determinations by refractometer. A new multiplication factor is determined at each
concentration determination by viscosity in accordance with ASTM D 445.
3.4.9.3.6.4
The calibration curve for each specific fluid shall accompany each refractometer.
3.4.9.3.6.5
For quenchants used with salt bath furnaces, the calibrating solutions shall contain known amounts of salt,
and the calibration method shall incorporate the effects of the salt.
3.4.9.3.6.6
Alternative Calibration Methods
Calibration methods different from 3.4.9.3.6.2 or 3.4.9.3.6.3 may be utilized when approved by the cognizant engineering
organization.
3.4.9.4
Salt Contamination
Salt content in polymer/water quenchants shall not exceed 6.0% by weight. Water/polymer quenchants used with salt
bath furnaces shall be tested for salt content weekly. The method used shall be calibrated against solutions containing
known amounts of both polymer and salt, and the procedure documented. Meters used to determine the salt
concentration shall be calibrated every 90 days. Quench tanks which exceed 6.0% salt content shall not be used until the
salt content has been reduced below 6% or the quenchant has been replaced.
3.5
Refrigeration
3.5.1
Parts requiring retention of the as quenched (AQ) condition after solution heat treatment shall, after quenching, be
refrigerated in conformance with the requirements of Table 6.
3.5.2
Prechilling
Prior to refrigeration, parts may be prechilled by immersion in a cooled liquid to accelerate cooling.
3.6
Aging
3.6.1
Parts requiring aging shall be aged as specified in Table 7.
3.6.2
Straightening After Aging
Straightening of parts in the following tempers is prohibited unless approved by the cognizant engineering organization:
T6, T6X, T7, T7X, T8 and T8X as well as parts in the T4 and T4X tempers which have aged sufficiently at room
temperature to meet either the hardness or conductivity minimum of AMS 2658.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
3.7
AMS 2770H
-8-
Annealing and Stress Relieving
3.7.1
Parts requiring annealing shall be heated, soaked and cooled as specified in Table 8.
3.7.2
A full anneal shall be used unless the treatment specified is a partial anneal or stress relief.
3.7.3
Except for material in the solution heat treated or aged condition, if a stress relief or stress relief treatment is
specified, the partial anneal parameters of Table 8 shall be used. The partial anneal (stress relief) treatments in
Table 8 shall not be used to relieve residual stress in parts in the solution heat treated or aged condition.
3.8
O1 (Formerly T411) Temper
Parts required to be in the O1 temper shall be heated to the solution heat treating temperature specified in Table 2,
soaked for the time specified in Table 3, and air cooled to room temperature.
Logs
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
3.9
A record (written or electronic storage media), traceable to temperature recording information (chart(s) or electronic
storage media) and to shop travelers or other documentation, shall be kept for each furnace and load. The information on
the combination of documents shall include: equipment identification, approved personnel’s identification, date; part
number or product identification, number of parts, alloy, lot identification, AMS 2770 (or other applicable specification),
actual thermal processing times and temperatures used. When applicable, atmosphere, quench delay, quenchant type,
polymer concentration, and quenchant temperature shall also be recorded. The maximum thickness, when process
parameters are based on thickness, shall be recorded and shall be taken as the minimum dimension of the heaviest
section of the part. The log data shall be recorded in accordance with the heat treater’s documented procedures.
3.10 Temper Conversion
When a warehouse, distributor or similar organization converts raw material to a different temper, it shall be heat treated
and tested in accordance with the requirements of this specification. The marking, testing and reporting shall be in
accordance with AMS 2772 and the material specification.
3.11 Qualification of Vendors (Subcontractors)
Facilities performing heat treatment in accordance with this specification shall be approved by the cognizant quality
assurance organization.
3.12 Personnel Training
Companies performing heat treatment in accordance with this specification shall have a verifiable program (either
company-created or conforming to ARP1962) of initial and periodic training and evaluation of its personnel. The training
program shall consist of one or more of the following: on-the-job training, classroom instruction, academic instruction.
4. QUALITY ASSURANCE PROVISIONS
4.1
Responsibility for Inspection
Except as specified by the purchasing documents, the processor shall be responsible for the performance of all tests and
inspections specified herein. The procuring activity reserves the right to perform any surveillance or tests or inspections of
parts, and to review heat treating records and results of processor’s tests and inspections to verify that heat treating
conformed to the specified requirements.
4.2
Records
Records shall be kept available for five years after heat treatment. The records shall contain all data necessary to verify
conformance to the requirements of this specification.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
SAE
4.3
4.3.1
AMS 2770H
-9-
Parts Control
Parts Other Than Rivets and Similar Small Standard Parts
Shall be tested in accordance with the following:
4.3.1.1
7xxx Alloy Parts in T7X Tempers
Every part shall be conductivity tested at the thickest section. Additionally, every part shall be hardness tested except,
when approved by the cognizant engineering organization, hardness testing frequency may be reduced to not less than
25%. (Parts which exhibit low conductivity and/or high hardness may be given additional aging (See Table 7) and
retested).
4.3.1.2
6061, 6063, 6066 and 6951 Alloy Parts
Every part shall be hardness tested. 6061, 6063, 6066 and 6951 alloy parts should not be conductivity tested and shall
not be rejected for failure to meet conductivity requirements of AMS 2658.
4.3.1.2.1
6013 alloy parts shall be tested in accordance with 4.3.1.3.
4.3.1.2.2
Air Blast, Water Spray or Fog Quenched 6xxx Series Alloy Parts (See 3.4.6)
In addition to hardness testing in accordance with 4.3.1.2, tensile specimens shall be taken from each heat treat load. The
specimens may be made from parts having the lowest hardness, or sample material representing the thickest section of
the parts, located near the center of the load. Tensile properties shall conform to the applicable material specification.
4.3.1.3
Other Alloys or Other Tempers
Each lot (See 8.8.10) of parts in a “T” temper shall be hardness and conductivity tested. (Hardness and conductivity
testing is not required for parts in the annealed or stress relieved condition.) Testing shall be in accordance with 4.3.1.3.1
or 4.3.1.3.2.
4.3.1.3.1
Every part shall be hardness tested and 10% of the parts shall be conductivity tested. The conductivity tested
parts should include those having the highest and lowest hardness.
4.3.1.3.2
Every part shall be conductivity tested and 10% of the parts shall be hardness tested. The hardness tested
parts should include those having the highest and lowest conductivity.
4.3.1.3.3
Tensile or Shear Testing
Alternatively, when tensile or shear testing is required, it may be substituted for the 10% hardness testing. Specimen(s)
shall be made from a part selected at random, or a prolongation thereof, or from a sample of the product from which the
parts were fabricated. The specimen(s) shall represent the maximum thickness of each lot of parts in each heat treat load.
If any test result fails to meet to the applicable requirements, the entire lot shall be rejected and referred to the customer
for disposition.
4.3.1.3.4
Sampling and Testing
In lieu of testing each part in accordance with 4.3.1.3.1 or 4.3.1.3.2, random samples of each lot may be tested for both
hardness and conductivity when sampling is approved by the cognizant quality assurance organization. The sampling
frequency shall not be less than 25 percent.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
4.3.1.4
- 10 -
Testing and acceptance criteria for parts whose size or shape does not permit hardness or conductivity testing
shall be as follows:
4.3.1.4.1
Either the hardness or conductivity testing may be omitted provided every part is tested by the remaining
method. If this option is used, the report shall reflect that the parts could not be hardness (or conductivity)
tested due to size or shape, and that all parts were conductivity (or hardness) tested.
4.3.1.4.2
If parts can neither be hardness nor conductivity tested, testing and acceptance criteria shall be as specified
by the cognizant quality assurance organization.
4.3.2
Rivets and Similar Small Standard Parts
If mechanical testing (e.g., tensile, shear) is not required on each lot, hardness testing is required on each lot of parts. In
addition, conductivity testing is required on each lot of 7xxx alloy parts. Sampling shall be at the same frequency as
required for the strength parameter by the part specification or drawing. For parts whose size or configuration precludes
the above testing, representative (in alloy, thickness, and temper) coupons shall be tested based on furnace used as
follows:
4.3.2.1
Parts Solution Heat Treated and Aged in Batch Type Furnaces
A minimum of three test coupons per lot shall have been randomly placed in each solution heat treatment and age load.
4.3.2.2
Parts Solution Heat Treated and/or Aged in Continuous Furnaces
A minimum of one test coupon per lot shall have been placed in each solution heat treating and aging furnace during
each shift or twelve hours, whichever is less.
4.3.3
Failures
If any part or coupon fails to meet either hardness or conductivity requirements of AMS 2658, every part (which can be
tested) in the lot shall be tested. Parts, and parts represented by coupons, which fail to meet either requirement shall be
rejected and referred to the customer for disposition.
4.4
Report/Certification
The heat treating processor shall furnish, with each shipment of parts, a certified quality assurance report, traceable to the
heat treat control number(s), stating that the parts were processed in accordance with the requirements of AMS 2770 (or
other applicable specification). This report shall include: purchase order number, part number or product identification,
alloy, temper/strength designation, quantity of parts in the shipment; identification of furnace(s) used; actual thermal
processing times and temperatures used. When applicable, the report shall include: atmosphere type, quenchant
(including polymer concentration range), hot straightening temperature and method of straightening (e.g. press, fixtures),
actual test results (e.g. hardness, conductivity, tensile, shear, etc.), and a statement of their conformance/nonconformance to requirements. This data shall be reported in accordance with the heat treater’s documented procedures.
5. PREPARATION FOR DELIVERY
Not applicable.
6. ACKNOWLEDGMENT
Not applicable.
7. REJECTIONS
Not applicable.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
- 11 -
8. NOTES
8.1
A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical
revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the
left of the document title indicates a complete revision of the specification, including technical revisions. Change
bars and (R) are not used in original publications, nor in specifications that contain editorial changes only.
8.2
Raw Material Heat Treatment
Production heat treatment by material producers and forge shops, or their vendors, of products listed below should be
performed in accordance with the procurement specification and/or AMS 2772 (See 8.8.8). Products applicable to AMS
2772 are: Sheet, Plate, Foil, Bar, Rod, Wire, Extruded Shapes, and Forgings.
8.3
Use of Load Sensors
The mandatory soaking times for air furnace solution heat treatment (Table 3) and aging (Table 7) are based on using
control sensors reflecting furnace air temperature. They include allowance for the lag between air temperature and metal
temperature. Therefore basing the start of soaking on load sensors, and soaking for the Table 3 and 7 times, will result in
excess soaking time. In the case of aging, this may result in reduced properties; in the case of solution heat treatment, it
will increase clad diffusion. Use of load sensors should be limited to confirming that parts reached and, during soaking,
remained within the allowable range, i.e., the range defined by applying the furnace temperature uniformity tolerance to
the specified temperature.
Solution heat treatment soak times include allowances for the more uniform temperature distribution in salt
baths/fluidized beds than air furnaces and the extra lag time needed for part temperatures to reach the heating
medium temperature in air furnaces.
8.5
Mill Furnished Tempers
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
8.4
The tempers listed below are normally furnished by producers and cannot be produced by users. Consequently, parts for
which product in one of these tempers is specified should not be re-solution heat treated, annealed, or heat treated to the
O1 (formerly T411) temper unless authorized by the cognizant engineering organization:
T3, T31, T36, T361, T37, T81, T86, T87, T351, T451, T651, T851, T861, T3510, T3511, T4510, T4511, T6510, T6511,
T8510, T8511, T7651, T7351, T76510, T73510, T73511, T736510, T736511, T652, T654, T7352, T7354, T73651,
T73652, T73654, T7451, T7452, T7454, T74510, T74511.
8.6
T736XX temper designations have been superseded by T74XX temper.
8.7
Aluminum Alloy Tempers are described in AS1990.
8.8
Terms used in AMS are clarified in ARP1917 and as follows:
8.8.1
Parts Heat Treatment
Heat treatment by a source other than the raw material producer. Product is tested to the requirements of the heat treat
processing specification or to selected requirements of other specifications (See 8.8.8). Rivets are considered parts at
any stage of manufacture.
8.8.2
Solution Heat Treatment
Heating an alloy at an elevated suitable temperature for sufficient time to allow soluble constituents to enter into solid
solution where they are retained in a supersaturated state after quenching.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
8.8.3
AMS 2770H
- 12 -
Aging (Precipitation Heat Treatment)
Soaking solution heat treated parts at a moderately elevated temperature or, for some alloys and tempers, at room
temperature to enhance strength and corrosion resistance properties.
8.8.4
Annealing
A thermal treatment used to soften metal. A full anneal will soften product to develop maximum formability and ductility. A
partial anneal (stress relief) is used when grain growth is a problem or when less formability or ductility than provided by a
full anneal is acceptable.
8.8.5
Polymer Quenchant
A water solution of polymer used to alter the quench rate, intended to minimize distortion and residual stresses.
8.8.6
O1 (formerly T411) Temper
A special annealed condition used to minimize warpage during machining. Response to ultrasonic inspection is better
than with “F” or “O” temper product. This is not a final temper.
8.8.7
AQ Temper After Quenching
8.8.8
Raw Material (e.g., Sheet, Plate, Bar, Extrusions, Forgings, Castings)
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
All alloys are in the AQ (as-quenched) temper immediately after quenching. After maximum delay time at room
temperature or maximum refrigerated storage time (as listed in Table 6) has elapsed, they are in the W temper which is
unstable, i.e., their properties are continually changing. After 96 hours, of room temperature aging, the 2xxx and 6xxx
alloys achieve stable, or relatively stable, T4 or T42 tempers.
Heat treatment is performed by or for the raw material producer and product is tested as required by the material
specification (See 8.8.1).
8.8.9
Cognizant
A term applied to the engineering organization responsible for the design of the parts, its allied quality assurance
organization, or a designee of those organizations.
8.8.10 Lot
A group of parts of the same part number and at the same stage of fabrication which have been either heat treated in the
same load or, in the case of continuous furnaces, hand loaded salt baths, etc., have been heat treated continuously
during a single shift, not to exceed a twelve hour period.
8.8.11 Recovery Time
The elapsed time between insertion of parts in a heating medium and start of soaking time.
8.8.12 Large Plan Form
A part which has a large planer surface area in relation to its thickness such as a plate or sheet.
8.9
Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and
properties in SI units and the Celsius temperatures are shown as approximate equivalents of the primary units and
are presented only for information.
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
PREPARED BY AMS COMMITTEE
“D” AND “AMEC”
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
- 13 -
TABLE 2 - SOLUTION HEAT TREATING TEMPERATURES
Set Temperature
Alloy
Form
°F
°C
2004
Sheet
985
529
2014, 2017, 2117
All
935
502
2024, 2124, 2224
All
920
493
2098
All
970
521
2219
All
995
535
6013
Sheet
1000
538
Rod/Bar
985
529
6061
All
985
529
6063
All
985
529
6066
All
985
529
6951
All
985
529
7049, 7149, 7249
All
875
468
7050
Forgings
880
471
7050
All Other
890
477
7075
Sheet under 0.05 inch (1.3 mm)
870
466
when aged to T73, T76 temper
7075
Sheet under 0.05 inch (1.3 mm)
920
493
when aged to T6 temper
7075
Other
870
466
7178
All
870
466
7475
Sheet, Plate under 0.500 inch
880
471
(12.7 mm)
7475
Plate, 0.500 inch (12.7 mm)
890
477
and over
Notes
10
8
12
1, 2
2, 7, 11
2, 7, 11
3, 6
3
4, 9
5
5
Notes:
1. The aging treatment for 7049, 7149 and 7249 alloys shall not be initiated until at least 48 hours at room
temperature have elapsed after quenching.
2. To avoid stress corrosion cracking of thick 7049, 7149, 7249 and 7050 parts, delay between quenching and start of
aging should not exceed 72 hours.
3. The 0.05 inch (1.3 mm) dimension refers to thickness at time of heat treatment.
4. If heat treater can positively identify the original raw stock as sheet or plate having a thickness of 0.05 to 1.0 inch
(1.3 to 25 mm), inclusive, 920 °F (493 °C) may be used.
5. After normal soaking, increase temperature to 920 °F (493 °C) for alclad and 955 °F (513 °C) for non clad;
minimum soaking time at higher temperatures, 15 minutes and 60 minutes, respectively.
6. 870 °F is the preferred treatment to achieve adequate hardness and conductivity readings but 920 °F (493 °C) may
be used to improve tensile properties.
7. Solution heat treat temperatures as low as 870 °F (466 °C) may be used to control recrystallization and surface
cracking problems.
8. For 6061, an alternate solution heat treating temperature of 995 °F (535 °C) may be used.
9. Rivets, which are to be aged to the T73 temper may be solution heat treated at 875 °F (469 °C).
10. Should not be solution heat treated after forming because it has a tendency to develop a large grain structure due
to recrystallization.
11. Eutectic melting may occur at the specified temperature if the raw material was not properly homogenized or
worked.
12. Applies to clad brazing sheet #21 and #22 - core is 6951 alloy.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
- 14 -
TABLE 3 - SOLUTION HEAT TREATING SOAKING TIMES
Minimum soaking Time,
(hours:minutes) (2)(3)(4)
Thickness (1)
Thickness (1)
Salt and
Inches
Millimeters
Fluidized Bed
Air Furnace
Up to 0.020, incl
Up to 0.51, incl
0:10
0:20
Over 0.020 to 0.032, incl
Over 0.51 to 0.81, incl
0:15
0:25
Over 0.032 to 0.063, incl
Over 0.81 to 1.60, incl
0:20
0:30
Over 0.063 to 0.090, incl
Over 1.60 to 2.29, incl
0:25
0:35
Over 0.090 to 0.125, incl
Over 2.29 to 3.18, incl
0:30
0:40
Over 0.125 to 0.250, incl
Over 3.18 to 6.35, incl
0:35
0:50
Over 0.250 to 0.500, incl
Over 6.35 to 12.70, incl
0:45
0:60
Over 0.500 to 1.0, incl
Over 12.70 to 25,
incl
0:60
1:30
Over 1.0 to 1.5, incl
Over 25
to 38,
incl
1:30
2:00
Over 1.5 to 2.0, incl
Over 38
to 51,
incl
1:45
2:30
Over 2.0 to 2.5, incl
Over 51
to 64,
incl
2:00
3:00
Over 2.5 to 3.0, incl
Over 64
to 76,
incl
2:15
3:30
Over 3.0 to 3.5, incl
Over 76
to 89,
incl
2:30
4:00
Over 3.5 to 4.0, incl
Over 89
to 102,
incl
2:45
4:30
Over 4.0
Over 102
Add 0:15 per
Add 0:30 per
0.500 inch
0.500 inch
(12.7 mm)
(12.7 mm)
Notes: 1.
2.
3.
4.
The thickness is the minimum dimension of the heaviest section at the time of heat treatment.
Soaking time starts when all thermocouples are within 10 °F (6 °C) degrees of the set temperature.
For alclad product, the maximum soaking time is 10 minutes longer than the minimum.
Minimum soaking times for second step of 7475 solution heat treatment are 15 minutes for alclad and 60 minutes
for nonclad.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
Polymer
Type (1)
Alloy
2024
2219
6061
7049
7050
7075
1
6061
7075
7049
7149
7050
2
- 15 -
TABLE 4 - LIMITS FOR QUENCHING IN POLYMER SOLUTIONS
Maximum Thickness (3)
Polymer (1)(4)
Form
Concentration %
Inches
Millimeters
0.040
1.02
34 max
0.063
1.60
28 max
Sheet, Extrusions
0.071
1.80
22 max
0.080
2.03
16 max
Sheet, Extrusions
0.073
1.85
22 max
0.250
6.35
40 max
Sheet, Plate, Bar,
0.375
9.52
32 max
Extrusions
1.00
25.4
22 max
0.080
2.03
40 max
0.250
6.35
34 max
Sheet, Plate
0.375
9.52
28 max
Bar
0.500
12.70
22 max
1.00
25.4
16 max
1.00
25.4
18 to 22
Forgings
2.00
50.8
11 to 15
2.50
63.5
8 to 12
1.00
25.4
18 to 22
Forgings
2.00
50.8
11 to 15
3.00
76.2
8 to 12
1.00
25.4
28 to 32
2.00
50.8
24 to 28
Forgings
3.00
76.2
18 to 22
4.00
101.5
13 to 17
7049
7050
7075
Extrusions
0.250
0.375
6.35
9.52
28 max
22 max
2024
Sheet, Extrusions
0.040
0.063
0.080
1.02
1.60
2.03
34 max
22 max
16 max
Sheet,
Plate,
Bar
0.040
0.190
0.250
1.02
4.83
6.35
34 max
20 max
18 max
6061
7049
7050
7075
6061
7075
Forgings
1.0
2.0
25.4
50.8
11 to 15
8 to 12
Notes
2
2
2
2
2
5
5
2
2
2
5
Notes:
1. Type 1 and Type 2 polymer solutions and concentrations shall conform to AMS 3025. Concentrations are percentages
by volume of the undiluted polymer as furnished by the producer.
2. Applicable when final temper is T4 or T42. When final temper is T6 or T62, sheet and plate up to 0.250 inch (6.35 mm),
inclusive, may be quenched in Type 1 or Type 2 polymer solution at 22% maximum.
3. Thickness is the minimum dimension of the largest section at the time of heat treatment.
4. Where only maximum concentration is shown, any 4% range may be used except the maximum shown shall not be
exceeded. When concentration is specified on a drawing or purchase order without tolerance or range the tolerance
shall be ±2%.
5. Prohibited for 7075 alloy over 1 inch (25 mm) when final temper is T6.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
- 16 -
TABLE 5 - MAXIMUM QUENCH DELAY TIMES (NOTE 1)
Maximum Thickness (Note 2)
Maximum Time Seconds
(Note 3)
Inch
Millimeters
Up to 0.016, incl
Up to 0.41, incl
5
Over 0.016 to 0.031, incl
Over 0.41 to 0.79, incl
7
Over 0.031 to 0.090, incl
Over 0.79 to 2.29, incl
10
Over 0.090
Over 2.29
15
1.
2.
3.
Alloy
2XXX
Others
The delay time is measured from the time the furnace door of an air furnace starts to open, or the
first portion of the load emerges from a fluidized bed or salt bath or the heating zone of a
continuous furnace, to complete immersion of the load in the quenchant.
Minimum thickness is the minimum dimension of the thinnest section of any part in the load.
The maximum quench delays specified may be exceeded providing tests made within the past
year have demonstrated that part temperatures do not fall below 775 °F (413 °C) before
immersion except, for 2219 alloy, part temperatures shall not fall below 900 °F (482 °C) before
immersion.
TABLE 6 – REFRIGERATION
Maximum Refrigerated Storage
Maximum Delay Time
Time, Days, at Max Temp Shown
Between Quench and
Refrigeration Minutes
10 °F (-12 °C)
0 °F (-18 °C)
-10 °F (-23 °C)
15
1
30
90
30
7
30
90
TABLE 7 - AGING TREATMENTS
Starting
Alloy
Form
Temper
Sheet
AQ, W
2XXX
Other
AQ, W
2004 Sheet
T4
Sheet
T3
2014
T4
All
T42
T3
T351
Sheet,
Plate,
T361
Drawn Tube
T42
T42
T4
2024 Forgings
T352
T351
Wire, Rolled Bar
T4
T351X
Extruded Bar and
T4
Shapes
T42
T351
2098 All
T42
2124 Plate
T351
Alclad Sheet
T42
Forgings
T42
All Other
T42
T31
Sheet
T37
T352
2219 Forgings
T4
T351
Plate
T37
Rivets
T31
Extruded Bar and
T31
Shapes
T351X
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Final
Temper
(2)
T4
T42
T6
T6
T6
T62
T81
T851
T861
T62
T72
T62
T852
T851
T6
T851X
T6
T62
T851
T62
T851
T62
T62
T62
T81
T87
T852
T6
T851
T87
T81
T81
T851X
Mand,
Pref or
Alt. (1)
M
M
M
M
1st Step
Temp
Time (12)
°F
°C
Hours
Room
N/A
Room
N/A
330
166
17 to 19
320
160
18 to 20
2nd Step
Temp
Time (12) Notes
(4)
°F
°C
Hours
10
10
5
5
M
350
177
8 to 9
M
375
191
12 to 13
M
M
M
375
375
375
191
191
191
8 to 9
9 to 12
16 to 18
5
5
M
375
191
12 to 13
5
M
375
191
12 to 13
M
375
191
12 to 13
M
M
M
M
M
M
M
M
M
M
M
M
M
320
320
375
375
375
375
350
325
350
375
350
325
350
160
160
191
191
191
191
177
163
177
191
177
163
177
17 to 19
17 to 19
12 to 13
17 to 19
25 to 27
35 to 37
17 to 19
23 to 25
17 to 19
25 to 27
17 to 19
17 to 19
17 to 19
M
375
191
17 to 19
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
5
5
5
5
5
5
5
5
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Notes:
SAE
AMS 2770H
- 17 -
TABLE 7 - AGING TREATMENTS (CONT’D)
Alloy
Form
6013 Sheet
6061
6063 All
6066
6951 Sheet (11)
Extruded Bar and
7049
Shapes
7149
Forgings
Rivets
Plate, Extruded
Bar, & Shapes
7050
Plate
All Except Plate
All
All
7178
250
121
6-8
350
177
11.5-12.5
6,8
M
M
M
M
P
A
P
A
P
A
P
A
P
A
P
A
M
P
A
P
A
M
M
M
M
M
M
M
250
250
250
250
225
250
225
250
225
250
250
225
225
250
250
225
250
250
250
250
250
250
250
250
250
250
250
250
121
121
121
121
107
121
107
121
107
121
121
107
107
121
121
107
121
121
121
121
121
121
121
121
121
121
121
121
6-8
6-8
6-8
23-25
6-7
4-5
6-7
4-6
6-7
4-5
3-4
6-7
6-7
4-5
3-4
6-7
23-25
23-25
4-6
23-25
4-6
10-12
4-28
3-5
3-5
23-25
3-5
3-5
350
350
350
177
177
177
6.5-7
3.5-4.5
6-8
6,8
6,8
6,8
325
350
325
350
350
350
325
325
350
350
320
320
163
177
163
177
177
177
163
163
177
177
160
160
26-28
8-10
16-18
5-7
8-10
8-10
16-18
16-18
6-8
6-8
19-21
19-21
3,8
3,8
8
8
8
8
8
8
8
8
8
8
325
325
320
320
325
325
315
325
163
163
160
160
162
162
157
163
16-18
16-18
18-20
18-20
6.5-7.5
4-10
3-3.25
10-12
8
8
8
8
6,8
6,8
8
8
AQ, W
T73
AQ, W
AQ, W
AQ, W
AQ, W
T76
T76
T74(9)
T6
AQ, W
T73
AQ, W
T76
T73
Extruded Bar &
Shapes
AQ, W
All
AQ, W
T62
Sheet, Plate
AQ, W
T76
AQ, W
T76
Extruded Bar &
Shapes
Forgings
7249
Extrusions
M
Mand,
Pref or
Alt. (1)
M
M
M
P
A
M
M
M
M
M
M
T76
7075 Wire, Rolled Bar,
Forgings
2nd Step
Temp
Time (12) Notes
(4)
°F
°C
Hours
10
5
10
5
5
10
5
330
166
21-22
6,7,8
330
166
14-15
6,8
330
166
13-14
6,8
355
179
8 Min
Final
Temper
(2)
T4, T42
T6, T62
T4, T42
T6
T62
T4, T42
T6, T62
T73
T76
T73
T73
T73
Sheet, Plate
1st Step
Temp
Time (12)
°F
°C
Hours
Room
N/A
375
191
4 to 5
Room
N/A
350
177
8 to 10
320
160
18 to 34
Room
N/A
320
160
17 to 19
250
121
23-25
250
121
23-25
250
121
23-25
250
121
4 Min
Starting
Temper
(4)(5)
AQ, W
T4, T42
AQ, W
T4
T42
AQ
T4, T42
W
W
W
AQ, W
T76
W
T73
W
T76
AQ, W
T61
Sheet
AQ, W
T761
7475
AQ, W
T6
Plate
AQ, W
T76
325
163
12-18
8
AQ, W
T73
325
163
24-30
8
Notes for Table 7 - Aging Treatments:
1. (M) Mandatory, (P) Preferred or (A) Alternate Aging Treatment.
2. Digits added to these basic temper designations to denote stress relief treatments etc. should appear identical before
and after aging.
3. Either second step age may be used with either first step age interchangeably.
4. For all T7XX tempers, the first step of the T7XX age may be omitted if parts (material) are (is) in the T6 temper.
5. When temper before furnace aging is AQ, W, T4, or T42, the furnace aging treatment may be started immediately
after quenching or at any time thereafter. With the exception of 7049, 7149 and 7249 alloys, natural aging is not
necessary before initiating a -T6XX or the first step of -T7XX age.
6. The aging treatment for 7049, 7149 and 7249 parts shall not be initiated until at least 48 hours after quenching. To
avoid stress corrosion cracking of thick 7049, 7149, 7249 and 7050 parts, the elapsed time between quenching and
start of aging should not exceed 72 hours.
7. 14 to 15 hours if thicker than 2 inches (51 mm).
8. Longer aging times, not exceeding a total of 4 additional hours (6 additional hours for 7050 forgings thinner than
0.260 inches (6.60 mm), at the specified second step temperature are permissible to reduce hardness and/or raise
conductivity of T7XX parts in order to meet AMS 2658 requirements.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT
SAE
AMS 2770H
- 18 -
9. Formerly designated T736.
10. T4 is achieved when hardness and conductivity per AMS 2658 are met. Typically, this is achieved within 96 hours at
room temperature.
11. Applies to clad brazing sheet #21 and #22 - core is 6951 alloy.
12. Soaking time shall conform to 3.2.5. All soaking times, except those for 7050 alloy and those referencing note 7, are for
product or nested stack up to 0.5 inch (12.7 mm) thickness (minimum dimension of heaviest section). Add 0.5 hours to
times for each additional 0.5 inch (12.7 mm) or fraction thereof. Soaking times shown are applicable to all thicknesses of
7050 alloy. When using load thermocouples to measure aging time, the soaking times for the 0.5 inch product shall apply.
13. Aging temperature and times for stress relieved tempers, TX5, TX51, TX51X and TX52 shall be the same as basic
temperatures.
TABLE 8 - ANNEALING
Alloy
1100,
5052
3003
2xxx,
6xxx
7xxx
Notes: 1.
2.
3.
4.
Full Anneal
Soaking Time
Set (1) Temperature
Minimum
°F
°C
Hours (2)
Cooling
Medium
630-660
333-349
0.5
Air
720-770
388-404
0.5
750-800
399-427
1
750-800
399-427
2
Air
Furnace (3)
or (4)
Furnace (4)
Partial Anneal (Stress Relief)
Set (1) Temperature Soaking Time
Cooling
Minimum
Medium
°F
°C
Hours (2)
630-660
333-349
0.5
Air
630-660
333-349
2
Air
Any temperature within the set temperature range may be used.
Soaking time starts when all thermocouples are within temperature range indicated. Soak times listed are for up to
0.5 inch (13 mm) maximum thickness. Add 0.5 hour for each additional 0.5 inch (13 mm) of product or nested
stack thickness or fraction thereof over 0.5 inch (13 mm).
Furnace cool at 50 °F (28 °C) degrees per hour maximum, to 500 °F (260 °C), air cool to room temperature.
Furnace cool at 50 °F (28 °C) degrees per hour maximum, to 450 °F (232 °C), hold at 450 °F
(232 °C) for 6 hours, furnace or air cool to room temperature.
--``,`,`,,`,``,,,`,`,,,,,,,,`,-`-`,,`,,`,`,,`---
Copyright SAE International
Provided by IHS under license with SAE
No reproduction or networking permitted without license from IHS
Licensee=Messier Dowty/5905381001
Not for Resale, 09/17/2006 21:31:28 MDT