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AISI Type 431
Category Steel
Class Stainless steel
Type Martensitic standard
Common Names Chromium steel
Designations  France: AFNOR Z 15 CN 16.02 , AFNOR Z 6 CNU 17.04
Germany: DIN 1.4057
Italy: UNI X 16 CrNi 16
Japan: JIS SUS 431
United Kingdom: B.S. 431 S 29 , B.S. 5 S 80
United States: AMS 5628 , ASTM A276 , ASTM A314 , ASTM A473 , ASTM A493 , ASTM A579 (grade 63) , ASTM A580 , MIL SPEC MIL-S-862 , SAE 51431 , SAE J405 (51431) , UNS S43100

ElementWeight %
C  0.20 
Mn  1.00 
Si  1.00 
Cr  15.0-17.0 
Ni  1.25-2.50 
P  0.04 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.8 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 200 25  
Tensile Strength (Mpa) 965  25  annealed, cold finished (wire) more
Yield Strength (Mpa)  
Elongation (%)  
Reduction in Area (%)  

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10.2  0-100 more  
Thermal Conductivity (W/m-K) 20.2  100   
Specific Heat (J/kg-K) 460  0-100   

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 720  25