Jun 18 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Stainless steels are called as high-alloy steels. Due to the presence of large amounts of chromium in the range of 4 to 30%, they have high corrosion resistance than other steels. Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. However, stainless steels present in the form of a combination of martensitic and austenitic steels are known as precipitation-hardened steels.
The following datasheet will provide more details about grade 430F stainless steel, which has moderate strength and corrosion resistance.
Chemical Composition
The following table shows the chemical composition of grade 430F stainless steel.
|
Element |
Content (%) |
|
Iron, Fe |
81 |
|
Chromium, Cr |
16 |
|
Manganese, Mn |
≤ 1.25 |
|
Silicon, Si |
≤ 1 |
|
Molybdenum, Mo |
≤ 0.60 |
|
Sulfur, S |
≥ 0.15 |
|
Carbon, C |
≤ 0.12 |
|
Potassium, K |
≤ 0.060 |
Physical Properties
The physical properties of grade 430F stainless steel are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
7.80 g/Cm³ |
0.282 lb/in³ |
|
Melting point |
1482°C |
2700°F |
Mechanical Properties
The mechanical properties of annealed grade 430F stainless steel are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength, ultimate |
550 MPa |
79800 psi |
|
Modulus of elasticity |
200 GPa |
29000 ksi |
|
Poisson’s ratio |
0.27 – 0.30 |
0.27 – 0.30 |
|
Elongation at break (in 50 mm) |
25% |
25% |
|
Hardness, Brinell |
170 |
170 |
|
Hardness, Knoop (converted from Brinell Hardness) |
189 |
189 |
|
Hardness, Rockwell B (converted from Brinell Hardness) |
86 |
86 |
|
Hardness, Vickers (converted from Brinell Hardness) |
178 |
178 |
Other Designations
Other designations that are equivalent to grade 430F stainless steel include the following:
-
ASTM A314
-
ASTM A473
-
ASTM A581
-
ASTM A582
-
ASTM A895
-
DIN 1.4104
-
AFNOR Z 10 CF 17
-
UNI x 10 CrS 17
-
JIS SUS 430
-
SS 2383
-
MIL SPEC MIL-S-862
-
SAE 51430F
-
SAE J405 (51430F)
Fabrication and Heat Treatment
Machinability
Machining of grade 430F stainless steel can be done with good feeds and speeds.
Welding
Grade 430F stainless steel cannot be welded due to its high sulfur content. If necessary, welding can be performed using low heat settings and AWS E/ER430 filler metal.
Hot Working
Grade 430F stainless steel can be hot worked by initially bringing the material to 816°C (1500°F) and then slowly to 1066 to 1149°C (1950 to 2100°F).
Cold Working
Grade 430F stainless steel can withstand only moderate cold forming.
Annealing
Grade 430F stainless steel can be annealed at temperature ranging from 677 to 760°C (1250 to 1400°F) and then air cooled.
Hardening
Grade 430F stainless steel is unresponsive to heat treatment.
Applications
The following are the major applications of grade 430F stainless steel.
-
Fasteners
-
Gears
-
Shafts
-
Pinions