Chemical composition and properties of 42CrMo4 alloy steel plate

Introduction of 42CrMo4 chromium molybdenum alloy steel:
42CrMo4 belongs to chromium molybdenum alloy steel plate. 42CrMo4 alloy steel is used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips that are heavily loaded. 42CrMo4 steel can also be used for drill pipe joints and fishing tools in oil wells below 2000m.

Chemical composition of 42CrMo4 alloy steel plate:
Carbon C: 0.38-0.45
Silicon Si: ≤0.40
Manganese Mn: 0.60-0.90
Sulfur S: allowable residual content ≤ 0.035
Phosphorus P: Allowable residual content≤0.035
Chromium Cr: 0.90-1.20
Molybdenum Mo: 0.15-0.30

Mechanical properties of 42CrMo4 alloy steel plate:
Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm²): ≥78(8)
Hardness: ≤217HB
Sample size: sample blank size is 25mm

Heat treatment specification and metallographic structure:
Heat treatment specification: quenching at 850℃, oil cooling; tempering at 560℃, water cooling, oil cooling.
Metallographic structure: tempered sorbite.

Execution standard of 42CrMo4 steel plate (1.7225): EN 10083-3.

Characteristics of 42CrMo4 alloy steel plate:
42CrMo4 steel has high strength, hardenability, good toughness, small deformation during quenching, and high creep strength and lasting strength at high temperature. 42CrMo4 steel is an improved variety of American AISI standard 4140 steel. The steel has good machinability, is easy to polish, bites easily, and can be electroplated.