Type 430 (UNS S43000)


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
* Maximum, unless range is indicated
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
Typical standards for Type 430 stainless steel
AMS 5503

Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.  © 2014 RMP Inc. All rights reserved.