Stainless Steel grade AISI 430/430F
Stainless steel grade 430 is a non-hardenable steel containing straight
chromium, and belongs to the ferritic group of steels. This steel is known
for its good corrosion resistance and formability, coupled with practical
mechanical properties. It can be used in certain chemical applications due
to its resistance to nitric acid.
Grade 430F stainless steel is usually provided in bar form to be used in
automatic screw machines.
All ferritic grades, such as stainless steel grade 430, have excellent stress
corrosion cracking resistance. Grade 430 has good corrosion resistance to
numerous substances, such as certain organic acids and nitric acid. The
corrosion resistance is maximized in well-polished or buffed condition. Its
pitting and crevice corrosion resistance is quite similar to that of grade
304. 430F is a high-sulfur free machining grade, and therefore the
resistance to pitting and crevice corrosion is comparatively lesser than
those grades that are non-free machining.
Stainless steel grade 430 is capable of resisting oxidation up to 870°C
(1598°F) in intermittent usage, and up to 815°C (1499°F) in continuous
usage. At room temperature, it has the tendency to become brittle,
especially when it has been heated for a long time in the 400-600°C (7521112°F) range. This issue can be overcome with annealing.
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Chemical Properties
430
(%)
0.12 max.
1.00 max.
1.00 max.
0.04 max.
0.030 max.
16.00 – 18.00
0.50
-
Composition
C
Mn
Si
P
S
Cr
Mo
Ni
N
430F
(%)
0.12 max
1.25 max.
1.00 max.
0.06 max.
0.15 min.
16.00 – 18.00
-
Mechanical Properties in room temperature
Grade
Tensile Strength
(MPa) min
430
430F
483
552 typical
Yield Strength
0.2% Proof (MPa)
min
310
379 typical
Elongation
(% in 50mm) min
Rockwell B (HR B)
max
Brinell (HB) max
22
25 typical
85
-
183
262
Physical Properties
Grade
Density
(kg/m3)
Elastic
Modulus
(GPa)
430
7750
200
Mean Coefficient of Thermal
Expansion
(μm/m/°C)
100°C
315°C
538°C
10.4
11.0
11.4
Thermal
Conductivity
(W/m.K)
100°C 500°C
26.1
26.3
Specific
Heat 0-100°
C (J/kg.K)
Electrical
Resistivity
(nΩ.m)
460
600
Grade Specification Comparison
Grade
430
430F
Old British
BS
430S17
-
Name
Euronorm No
Japanese JIS
X8Cr17
X12CrMoS17
1.4016
1.4104
SUS 430
SUS 430f
Many pieces of bright trim on automobiles have been made of Carpenter Stainless Type 430-body molding, door
handles, hub caps, instrument panel trim, finishing washers, bumper medallions.
www.steeleaglemalta.com [email protected] +356.21.333.190