20CrMo Steel Equivalent, Chemical Composition, Mechanical Properties

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20CrMo Alloy Steel

GB 20CrMo steel is a kind of Chinese alloy steel for engineering and mechanical structure purpose, which is generally used in quenching or tempering or carburizing and quenching. 20CrMo material has high heat strength, good hardenability, no temper brittleness, cold strain plasticity, good machinability and weldability.

Applications

20CrMo alloy steel is used in the manufacture of non-corrosive media in chemical equipment and high pressure pipes, fasteners, steam turbines, boiler blades and forgings with working temperature below 250 °C, and important carburizing parts such as gears and shafts in general machines. It can also be used in place of 1Cr13 steel to manufacture medium pressure, low pressure steam turbines in the superheated steam zone pressure stage working blades.

Datasheet

20CrMo Steel Chemical Composition

Chemical Composition (%)
Steel Grade C Si Mn P S Cr Mo Cu
20CrMo 0.17 to 0.24 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

20CrMo Alloy Steel Mechanical Properties

  • Yield strength: ≥ 685 MPa
  • Tensile strength: ≥ 885 MPa
  • Elongation: ≥12%
  • Rate of reduction in area: ≥50%
  • Impact absorbing energy: ≥ 78 J
  • Material Brinell hardness: ≤ 197 (Annealed or high temperature tempered steel rod)
  • Sample size: 15mm

Heat Treatment Specification

  • First quenching heating temperature: 880 °C (Quenching agent: water, oil)
  • Tempering heating temperature: 500 °C (agent – water, oil)

Equivalent Grades

20CrMo material equivalent to US ASTM, European Germany DIN EN, British BS EN, France NF EN, Japanese JIS, and ISO standard. (For reference)

20CrMo steel equivalent
China USA Germany Japan France UK ISO
Standard Grade Standard Grade Standard Grade (Steel Number) Standard Grade Standard Grade (Steel Number) Standard Grade (Steel Number) Standard Grade
GB/T 3077 20CrMo AISI SAE;
ASTM A29/A29M
4120 DIN EN 10083-3 25CrMo4 (1.7218) JIS G4053 SCM420 NF EN 10083-3,
NF A35-551
25CrMo4 (1.7218),
18CD4
BS EN 10083-3,
BS 970 Part 1
25CrMo4 (1.7218),
708M20
ISO 683-1 18CrMo4

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