What is the chemical composition of 42CrMo alloy steel?

42CrMo steel belongs to the high strength alloy steel, with high degree and toughness, good hardenability, and no obvious temper brittleness. After quenching and tempering, it has higher fatigue limit and resistance to multiple impacts, and good low-temperature impact toughness. The alloy steel is suitable for manufacturing large and medium-sized plastic molds that require certain strength and toughness.

Chemical composition:

C: 0.38~0.45%, Si: 0.17~0.37%, Mn: 0.50~0.80%, S: ≤0.035%, P: ≤0.035%, Cr: 0.90~1.20%, Ni: ≤0.30%, Cu: ≤ 0.30%, Mo: 0.15~0.25%.

42CrMo steel has high creep strength and lasting strength at high temperature. It 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, pressure vessel gears, rear axles, loaded connecting rods and spring clips. 42CrMo alloy steel can also be used for oil deep well drill pipe joints and fishing tools below 2000m, and can be used for molds of bending machines.