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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:
0.70-1.00Cr:
0.80-1.10Mo:
0.15-0.25Ni:
0.00-0.00Fe:
97.20-98.00Cu:
0.00-0.00Mechanical Properties
Tensile strength (ksi):
0.00-180.00Yield strength (ksi):
145
Elongation (%):
5
Hardness (Brinell):
0.00-0.00