Aurubis Stolberg Advanced Phosphor Bronze Alloys

English
Aurubis Stolberg
Advanced Phosphor Bronze Alloys
Advanced Phosphor Bronze
opens up new possibilities
for applications
Phosphor Bronze alloys are regarded as very
important copper materials due to their excellent properties, such as the combination of high
strength with sufficient electrical conductivity
and high resistance to wear and corrosion. They
are the preferred material for the production
of electrical contact parts thanks, in particular,
to their unusual springiness and outstanding
fatigue strength.
Aurubis Stolberg is now offering advanced phosphor bronze alloys to meet the constantly increasing demands on modern contact materials.
Composition
and metallurgy
Advanced phosphor bronze alloys are bronze
materials with a tin content of between 3.5 and
9 % and CuSnZn9, which also contain small
amounts of nickel and iron.
The strength of conventional bronze materials
stems from the impact of solid solution hardening that is achieved by the alloy’s tin content.
In addition to this solid solution strengthening,
the processing of advanced phosphor bronze
alloys into semi-finished products results in
precipitation hardening due to the formation
of nickel and iron phosphides during a special
annealing process.
The chemical composition and physical properties of advanced phosphor bronze with 4 and 8 %
tin are shown in the following table.
* Unified numbering system
Copper
Tin
Iron
Nickel
Phosphorus
Zinc
Density
Electr.
conductivity
Thermal
conductivity
Therm. Expan­
sion coeff.
E-module
AURUBIS STOLBERG
PNA 284
CuSn4
UNS* S51100
PNA 294
CuSn4 Adv.
UNS* C51180
PNA 283
CuSn8
UNS* C52100
PNA 293
CuSn8 Adv.
UNS* C52180
PNA 299
CuSn3Zn9
Adv.
UNS* C42520
Residue
3.5 – 4.9
< 0,10
–
0.03 – 0.35
–
8.85 g/cm3
12.0 MS/m
Residue
3.50 – 4.90
0.05 – 0.20
0.05 – 0.20
0.01 – 0.35
–
8.85 g/cm3
11.6 MS/m
Residue
7.0 – 9.0
< 0.10
–
0.03 – 0.35
–
8.80 g/cm3
7.5 MS/m
Residue
7.00 – 9.00
0.05 – 0.20
0.05 – 0.20
0.01 – 0.35
–
8.80 g/cm3
7.4 MS/m
88.0 – 91.0
1.50 – 3.00
0.05 – 0.20
0.05 – 0.20
0.01 – 0.20
Residue
8.80 g/cm3
17 MS/m
100 W/mK
90.6 W/mK
62.4 W/mK
67 W/mK
130 W/mK
18.0 10-6K-1
17.8 10-6K-1
18.2 10-6K-1
18.5 10-6K-1
18.4 10-6K-1
120 GPa
110 GPa
110 GPa
115 GPa
110 GPa
Strength
and electrical conductivity
The strength compared with conventional
bronze can be increased on account of the
additional strengthening caused by the aforementioned nickel and iron precipitation.
Since the additionally discharged iron and nickel
are precipitated in the form of the aforementioned phosphide, the electrical and thermal
conductivity does not appreciably decline
compared with iron-free and nickel-free bronze
with the same tin content.
New areas of application are the result of the
increased strength of these advanced phosphor
bronze alloys. With still good workability, a
modified CuSn8 bronze can achieve tensile
strength of more than 900 N/mm², which today
is normally confined to CuBe alloys. The advanced CuSn8 bronze thus presents both an economically and ecologically interesting alternative
to CuBe materials.
With modified CuSn4 (CuSn4 Adv.), it is for
instance possible in this way to achieve the
strength of conventional CuSn6 while maintaining the conductivity of conventional CuSn4.
The alloy CuSn3Zn9Adv. offers the strength
and processing properties of conventional
CuSn4 but with much higher conductivities.
This combination of possible spring force and
conductivity enables new possibilities for the
connector designer.
FIG. 1: Yield strength and electrical conductivity of
copper alloys
AURUBIS STOLBERG
Workability
Also when processed into complex punching/
bending parts, these materials have a technolo­
gical advantage in the form of a favourable stress
condition, lower particle size and thus improved
flexibility.
Additionally, advanced phosphor bronze alloys
have excellent properties for punching and electroplating. They can also be very well soft and hard
soldered and are suitable for resistance welding.
Delivery
programme
DIMENSIONS:
As for the conventional phosphor bronze alloys,
Aurubis Stolberg supplies advanced phosphor
bronzes in the following dimensions and coil
weights
• Strip thickness: 0.1 to 3.0 mm
• Strip width: 10 to 600 mm
• Spec. coil weight: up to 15 kg/mm
SURFACE FINISH:
The following surface finishes can be delivered
• blank
• hot-dip tinned
• electroplated
SHAPES:
• coil (eye-to-sky or eye-to-wall)
• ContiCoil
• traverse wound (with or without core)
APB_03/12 EN
FIG. 2: Bendability of bronze alloys, here for example
a 90° bend in parallel with the rolling direction
Contact
Aurubis Stolberg GmbH & Co KG
Fon
Fax
Zweifaller Straße 150
D – 52224 Stolberg
E-mail:[email protected]
Webwww.aurubis.com/stolberg
+ 49 2402 1241-0
+ 49 2402 1241-2927