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4340 Steel Properties & Composition

General Information

Cast Alloy Designation:

10Q(4340)

Alloy family:

Carbon and Low Alloy

UNS #:

J24053

ASTM Standard(s):

A732

A915

Wrought:

4340

Chemical Composition

C:

0.35-0.45

Mn:

0.70-1.00

Cr:

0.70-0.90

Mo:

0.20-0.30

Ni:

1.65-2.00

Fe:

94.85-96.40

Cu:

0.00-0.50

Mechanical Properties

Tensile strength (ksi):

0.00-180.00

Yield strength (ksi):

145

Elongation (%):

5

Hardness (Brinell):

0.00-0.00