Hot rolled alloy steel bar ASTM 4140

Round bar

Diameter(mm)

Length (mm)

20~800

3000~9000

Plate

Thickness(mm) 

Width (mm)  

Length (mm)   

Max:800

Max:2200

Max:9000

The specification can be customized.

 2,Chemical   Compositons

Grade

C

Si

Mn

P

S

Cr

Mo

Ni

42CrMo

0.38~0.45

0.17~0.37

0.50~0.8

≤0.035

≤0.035

0.9~1.2

0.15-0.25

≤0.3

4140

0.40~0.45

0.15~0.35

0.75~1.0

≤0.035

≤0.040

0.8~1.1

0.15-0.25

-

SCM44

0.38~0.43

0.15~0.35

0.60~0.9

≤0.030

≤0.030

0.9~1.2

0.15-0.30

≤0.25

1.7225

0.38~0.45

≤0.40

0.60~0.9

≤0.025

≤0.035

0.9~1.2

0.15-0.30

3,Features   of 4140 alloy steel

1, Chromium molybdenum alloy   steel 

2, Slightly higher carbon   content then 4130

3, Greater strength and heat   treatment 

4,Typical   Applications 

1, Applications in the oil and   gas sector

2, Connection rods, collets,   conveyor pins, 

3, Gears, stem   assemblies, 

4, Pump shafts and tool holders