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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