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4140 Steel Properties & Composition

General Information

Cast Alloy Designation: 
8Q(4140)
Alloy family: 
Carbon and Low Alloy
UNS #: 
J14049
ASTM Standard(s): 
A732
A915
Wrought: 
4140

Chemical Composition

C: 
0.35-0.45
Mn: 
0.70-1.00
Cr: 
0.80-1.10
Mo: 
0.15-0.25
Ni: 
0.00-0.00
Fe: 
97.20-98.00
Cu: 
0.00-0.00

Mechanical Properties

Tensile strength (ksi): 
0.00-180.00
Yield strength (ksi): 
145
Elongation (%): 
5
Hardness (Brinell): 
0.00-0.00