4140 seamless tube chemical composition and mechanical properties

Grade

Chemical composition %

C

Si

Mn

P

S

Cr

Ni

Mo

Cu

4140

0.38~0.45

0.17~0.37

0.50~0.80

≤0.035

≤0.035

0.9~1.2

≤0.3

0.15~0.25

≤0.3

Mechanical properties

Tensile Strength (Mpa)

Yield Strength (Mpa)

Elongation in 2 in.
%

Akv (J)

Hardness

≧1080

≧930

≧12

≧63

≤217HB