eFunda: Properties of Alloy Steel AISI Type 420
engineering fundamentals Alloy Steel AISI Type 420
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AISI Type 420
Category Steel
Class Stainless steel
Type Martensitic standard
Common Names Chromium steel
Designations  France: AFNOR Z 20 C 13
Germany: DIN 1.4021
Italy: UNI X 2O Cr13
Japan: JIS SUS 420 J1
Sweden: SS 2303
United Kingdom: B.S. 420 S 37 , B.S. CDS-18
United States: AMS 5506 , AMS 5621 , ASTM A276 , ASTM A314 , ASTM A473 , ASTM A580 , FED QQ-S-763 , FED QQ-S-766 , FED QQ-W-423 , MIL SPEC MIL-S-862 , SAE 51420 , SAE J405 (51420) , UNS S42000

Composition

ElementWeight %
C  0.15 (min) 
Mn  1.00 
Si  1.00 
Cr  12.0-14.0 
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) 860  25  annealed, cold finished (wire) more
Yield Strength (Mpa)  
Elongation (%)  
Reduction in Area (%)  
Hardness (HRC) 52  25  tempered at 205°C (bar) 

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10.3  0-100 more  
Thermal Conductivity (W/m-K) 24.9  100   
Specific Heat (J/kg-K) 460  0-100   

Electric Properties

Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 550  25   
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