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AISI Type 420F
Category Steel
Class Stainless steel
Type Martensitic standard
Common Names Chromium steel
Designations  United States: AMS 5620 , SAE 51420F , SAE J405 (51420F) , UNS S42020

ElementWeight %
C  0.15 (min) 
Mn  1.25 
Si  1.00 
Cr  12.0-14.0 
P  0.06 
S  0.15 (min) 
Mo(optional)  0.6 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 760  25  annealed and cold drawn (bar) more
Yield Strength (Mpa) 690 
Elongation (%) 14 
Reduction in Area (%) 40 
Hardness (HB) 228  25  annealed and cold drawn (bar) more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10.3  0-100 more