Use of 30CrMo Alloy Steel

30CrMo steel?is a Chinese alloy steel for engineering and machine structural use, has high strength and high toughness, and has good high temperature strength at temperatures below 500 C. 30CrMo material also has good machinability, medium cold bending and plasticity, high hardenability, good weldability, and is generally used in the adjusted state.

30CrMo alloy steel can be used to manufacture steel pipes with working temperature below 400 C, fasteners with operating temperature below 450 C in boilers and steam turbines, nuts and flanges with working temperature below 500 C and high pressure, and load in general machinery; Shafts, gears, bolts, studs, manipulators, high-pressure conduits and weldments in chemical equipment below 250 C, nitrogen-hydrogen up to medium working.

30CrMo Steel Chemical Composition

Chemical Composition (%)
Steel Grade C Si Mn P S Cr Mo Cu
30CrMo 0.26 to 0.33 0.17 to 0.37 0.40 to 0.70 0.030 0.030 0.80 to 1.10 0.15 to 0.25 0.30

Mechanical Properties of 30CrMo Steel

  • Yield strength: 785 MPa
  • Tensile strength: 980 MPa
  • Elongation: 10%
  • Rate of reduction in area: 50%
  • Impact absorbing energy: 63 J
  • Brinell Hardness: 269 (Annealed or high temperature tempered steel rod)
  • Sample size: 25mm

Heat Treatment Specification of 30CrMo Material

  • First quenching heating temperature: 850 C (Coolant C oil)
  • Tempering heating temperature: 500 C (Coolant C water, oil)


30CrMo steel equivalent to US ASTM, European Germany DIN EN, British BS EN, France NF EN, Japanese JIS, and ISO standard. (For reference)

30CrMo material equivalent
China USA Germany Japan France UK ISO
Standard Grade Standard Grade Standard Grade Standard Grade Standard Grade Standard Grade Standard Grade
GB/T 3077 30CrMo ASTM A29/A29M 4130 DIN EN 10083-3 25CrMo4,
JIS G 4053 SCM430 NF EN 10083-3 25CrMo4,