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AISI L6
Category Steel
Class Tool steel
Type Low-alloy special-purpose tool steel
Designations United States: UNS T61206

Composition
ElementWeight %
C  0.65-0.75 
Mn  0.25-0.80 
Si  0.50 
Cr  0.60-1.20 
Ni  1.25-2.00 
Mo  0.50 
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) 7.86 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 655  25  annealed  more
Yield Strength (Mpa) 380 
Elongation (%) 25 
Reduction in Area (%) 55 
Hardness (HRB) 93  25  annealed more
Impact Strength (J)
(Charpy V-notch)
12  25  oil quenched from 845°C, single tempered at 315°C  more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 11.3  20-100 more  
Glossary