1,Size of 4340 Alloy Steel

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

4340

0.38-0.43

0.15-0.35

0.60-0.80

≤0.035

≤0.040

0.70-0.90

0.20-0.30

1.65-2.00

3,Features of 4340 alloy steel

1, Chromium molybdenum alloy steel;

2, High strength and toughness;

3, Good stability of hardenability and anti-overheating;

4, Good high tensile strength with shock resistance.

4,Typical Applications 

1, Heavy machinery and high-load of shaft;

2, Rotor shaft and blades;

3, Special performance requirements of the vital parts after nitriding treatment.