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AISI S7
Category Steel
Class Tool steel
Type Shock-resisting steel
Designations  United States: ASTM A681 , UNS T41907

Composition
ElementWeight %
C  0.45-0.55 
Mn  0.20-0.80 
Si  0.20-1.00 
Cr  3.00-3.50 
Mo  1.30-1.80 
V  0.20-0.30(a) 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.76 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 640  25  annealed  more
Yield Strength (Mpa) 380 
Elongation (%) 25 
Reduction in Area (%) 55 
Hardness (HRB) 95  25  annealed more
Impact Strength (J)
(Charpy unnotched)
244  25  fan cooled from 940°C, single tempered at 205°C  more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 12.6  20-200 more  
Glossary