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AISI 8630
Category Steel
Class Alloy steel
Type Standard
Common Names Nickel-chromium-molybdenum steel
Designations  Germany: DIN 1.6545
Italy: UNI 30 NiCrMo 2 KB
United States: AMS 6280 , AMS 6280E , AMS 6281 , AMS 6281C , AMS 6355 , AMS 6355G , AMS 6530 , AMS 6530E , AMS 6550 , AMS 6550E , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J412 , SAE J770 , UNS G86300

Composition

ElementWeight %
C  0.28-0.33 
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) 564.0  25  annealed at 845°C  more
Yield Strength (Mpa) 372.3 
Elongation (%) 29.0 
Reduction in Area (%) 58.9 
Hardness (HB) 156  25  annealed at 845°C more
Impact Strength (J)
(Izod)
95.2  25  annealed at 845°C  more

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 11.2  21-100 more  
Glossary