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Introduction of AISI4140

Introduction of AISI4140

American steel AISI4140 Chemical Composition  Executive Standard  Material Certification

Alloy Constructional Steel: AISI4140

Executive Standard: ASTM A29/A29M-04

Characteristics and Scope of AISI4140 Application:

4140 sheet metal has good machinability, small processing deformation and very good fatigue resistance. It belongs to medium-hardenability steel. After heat treatment, 4104 has good strength, good comprehensive mechanical properties, good technology and high production rate. The maximum operating temperature is 427 degrees Celsius.

4140 sheet metal has high strength, high hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature. It is used to produce forge pieces with higher strength than 35CrMo steel and larger tempering section, such as large gear, turbocharger drive gear, rear axle, heavy load connecting rod and spring clip for locomotive traction, and it can also be used for deep drilling rod joints and fishing tools under 2000m.

Chemical Composition of 4140 sheet metal:

Carbon (C) 0.38 ~ 0.43

Manganese (Mn) 0.75 ~ 1.00

Phosphorus (P)≤0.030

Sulfur (S)≤ 0.040

Nickel (Ni)≤0.030

Chromium (Cr) 0.80 ~ 1.10

Molybdenum(Mo) 0.15 ~ 0.25

Mechanical Properties:

Tensile strength σb (MPa): ≥ 1080 (110)

Yield strength σs (MPa): ≥ 930 (95)

Elongation δ5 (%): ≥12

Reduction of Area ψ(%): ≥ 45

Impact Power Akv (J):  ≥ 63

Impact Toughness Index αkv (J/cm2): ≥ 78 (8)

Hardness: ≤ 217HB

Sample Size: the size of sample blank is 25mm

Heat Treatment Specification and Metallographic Organization:

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