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AISI S1
Category Steel
Class Tool steel
Type Shock-resisting steel
Designations  France: AFNOR 55 WC 20
Germany: DIN 1.2550
Italy: UNI 58 WCr 9 KU
United States: ASTM A681 , FED QQ-T-570 , SAE J438 , UNS T41901

Composition
ElementWeight %
C  0.40-0.55 
Mn  0.10-0.40 
Si  0.15-1.20 
Cr  1.00-1.80 
Ni  0.30 
Mo  0.50 
W  1.50-3.00 
V  0.15-0.30 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.88 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 690  25  annealed  more
Yield Strength (Mpa) 415 
Elongation (%) 24 
Reduction in Area (%) 52 
Hardness (HRB) 96  25  annealed more
Impact Strength (J)
(Charpy unnotched)
249  25  oil quenched from 930°C, single tempered at 205°C  more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 12.4  20-100 more  
Glossary