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AISI Type 440A
Category Steel
Class Stainless steel
Type Martensitic standard
Common Names Chromium steel
Designations  United States: AMS 5631 , ASTM A276 , ASTM A314 , ASTM A473 , ASTM A511 , ASTM A580 , FED QQ-S-763 , MIL SPEC MIL-S-862 , SAE 51440A , SAE J405 (51440A) , UNS S44002

Composition
ElementWeight %
C  0.60-0.75 
Mn  1.00 
Si  1.00 
Cr  16.0-18.0 
P  0.04 
S  0.03 
Mo  0.75 

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 (bar) more
Yield Strength (Mpa)  
Elongation (%)  
Reduction in Area (%)  
Hardness (HRB) 95  25  annealed (bar) more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10.2  0-100  
Thermal Conductivity (W/m-K) 24.2  100   
Specific Heat (J/kg-K) 460  0-100   

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 600  25   
Glossary