What is 42CrMo4 JIS equivalent steel grade

What is 42CrMo4 JIS equivalent steel grade? First, let us have a basic learning of 42CrMo4 steel. 42CrMo4 steel is EN standard chromium-molybdenum steel that is usually used after quenching and tempering treatment. 42CrMo4 steel is characterized by high intensity and harden-ability.

42CrMo4 JIS equivalent steel grade is SCM440, which is under JIS G4105 technical standard. 42CrMo4 steel has better performance than 34CrMo4 steel and 25CrMo4 steel, because the carbon and chromium content of 42CrMo4 steel is higher.

42CrMo4 JIS equivalent steel grade SCM440 has high fatigue strength and good low-temperature impact toughness. The temper brittleness of the both two materials are not obvious.