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AISI 8620
Category Steel
Class Alloy steel
Type Standard
Common Names Nickel-chromium-molybdenum steel
Designations  France: AFNOR 20 NCD 2 , AFNOR 22 NCD 2
Germany: DIN 1.6523
Italy: UNI 20 NiCrMo 2
Japan: JIS SNCM 21 , JIS SNCM 21 H
United Kingdom: B.S. 805 H 20 , B.S. 805 M 20
United States: AMS 6274 , AMS 6274G , AMS 6276 , AMS 6276C , AMS 6277 , AMS 6277A , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A513 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J770 , UNS G86200

Composition

ElementWeight %
C  0.18-0.23 
Mn  0.70-0.90 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.40-0.60 
Ni  0.40-0.70 
Mo  0.15-0.25 

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) 536.4  25  annealed at 870°C  more
Yield Strength (Mpa) 385.4 
Elongation (%) 31.3 
Reduction in Area (%) 62.1 
Hardness (HB) 149  25  annealed at 870°C more
Impact Strength (J)
(Izod)
112.2  25  annealed at 870°C  more
Glossary