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Typical standards for Type 430 stainless steel overview
Type 430 is a ferritic stainless steel with corrosion resistance approaching that of 304/304L stainless steel. This grade does not work harden rapidly and can be formed using both mild stretch forming, bending, or drawing operations. This grade is used in a variety of interior and exterior cosmetic applications where corrosion resistance is more important than strength. Type 430 has poor weldability compared to most stainless steels due to the higher carbon content and lack of stabilizing elements for this grade, which requires post weld heat treatment to restore the corrosion resistance and ductility. Stabilized grades such as Type 439 and 441 should be considered for welded ferritic stainless steel applications.
Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*
| Element | 430 |
| Carbon | 0.12 |
| Chromium | 16.0-18.0 |
| Nickel | 0.75 |
| Manganese | 1.00 |
| Silicon | 1.00 |
| Phosphorus | 0.040 |
| Sulfur | 0.030 |
Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240
| Property | 430 |
| Yield Strength, min. (ksi) | 30 |
| Tensile Strength, min. (ksi) | 65 |
| Elongation, min. (%) | 22 |
| Hardness, max. (Rb) | 89 |
Physical Properties
Physical properties for Type 430 stainless steel
| Property | 430 Data |
| Density, lb/in3 | 0.276 |
| Modulus of Elasticity, psi | 29.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 5.7 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 13.8 |
| Specific Heat, Btu/lb ˚F | 0.11 |
| Electrical Resistivity, Microohm-in | 23.6 |
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