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AISI 8640H
Category Steel
Class Alloy steel
Type H-steel
Common Names Nickel-chromium-molybdenum steel
Designations  Germany: DIN 1.6546
Italy: UNI 40 NiCrMo 2 KB
United Kingdom: B.S. Type 7
United States: ASTM A304 , SAE J1268 , UNS H86400

Composition

ElementWeight %
C  0.37-0.44 
Mn  0.70-1.05 
Cr  0.35-0.65 
Ni  0.35-0.75 
Mo  0.15-0.25 
P  0.035 
S  0.040 
Si  0.15-0.30 

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) 945  25  cold drawn (round bar (25 mm)) more
Yield Strength (Mpa) 931 
Elongation (%)
Reduction in Area (%) 43 
Hardness (HB) 277  25  cold drawn (round bar (25 mm)) more
Glossary