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AISI S5
Category Steel
Class Tool steel
Type Shock-resisting steel
Designations  United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T41905

Composition
ElementWeight %
C  0.50-0.65 
Mn  0.60-1.00 
Si  1.75-2.25 
Cr  0.35 
Mo  0.20-135 
V  0.35 
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) 725  25  annealed  more
Yield Strength (Mpa) 440 
Elongation (%) 25 
Reduction in Area (%) 50 
Hardness (HRB) 96  25  annealed more
Impact Strength (J)
(Charpy unnotched)
206  25  oil quenched from 870°C, single tempered at 205°C  more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 12.6  20-425 more  
Glossary