SAE 4140 Alloy structural steel bar specification

SAE 4140 Alloy steel bar manufacturing requirements for higher strength than the 35CrMo steel and tempered sectional Larger forgings, such as locomotive traction with the large gear, supercharger drive gear, rear axle, that great link load and spring clip ,SAE 4140 can also be used to 2000m deep oil drill pipe joints and fishing tools, and can be used bend the mold machine.

SAE 4140 Alloy structural steel bar other properties are as follows:

Chemical composition(%)

(C)0.38～0.45 (Si)0.17～0.37 (Mn)0.50～0.80 (P)≤0.035 (S)≤0.035 (Cr)0.9～1.20 (Ni)≤0.30 (Mo)0.15～0.25 (Cu)≤0.30

Mechanical Properties

Tensile strength:σb (MPa)：≥1080(110)

Yield strength:σs (MPa)：≥930(95)

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