24 July 2021 Gear Steel Bar
20CrMo Gear Stee Bar
20CrMo is an alloy structural steel with high hardenability, no temper brittleness, poor weldability, similar to 45# weldability, a certain tendency to cold crack, good machinability and cold strain plasticity.
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.
Generally used in quenched and tempered or carburized and quenched state, it can be used to replace 20CrMnTi , 20Cr, 20MV, 20Mn2, 20CrNi and other materials. It is used to manufacture high-pressure pipes and various fasteners that work in non-corrosive media and media containing nitrogen and hydrogen mixtures with a working temperature of less than 250°C, as well as higher-grade carburized parts, such as gears, shafts, etc.
Chemical Composition:
| C | Si | Mn | P | S | Cr | Mo | Cu |
|---|---|---|---|---|---|---|---|
| 0.17~0.24 | 0.17~0.37 | 0.40~0.70 | ≤ 0.030 | ≤ 0.030 | 0.80~1.10 | 0.15~0.25 | ≤ 0.30 |
Equivalent Steel Grade Composition:
| Steel Type | Standard | Country Code | C(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Mo(%) | Ni(%) | Cu(%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
SCM420 | 3229 | CNS | 0.18-0.23 | 0.15-0.35 | 0.60-0.85 | ≦0.03 | ≦0.03 | 0.9-1.2 | 0.15-0.30 | ≦0.25 | ≦0.3 |
20CrMo | 3077 | GB | 0.17-0.24 | 0.17-0.37 | 0.4-0.7 | ≦0.035 | ≦0.035 | 0.8-1.1 | 0.15-0.25 | ||
SCM420 | G4105 | JIS | 0.18-0.23 | 0.15-0.35 | 0.60-0.85 | ≦0.03 | ≦0.03 | 0.9-1.2 | 0.15-0.30 | ≦0.25 | ≦0.3 |
4118 | - | AISI | 0.18-0.23 | 0.15-0.35 | 0.7-0.9 | ≦0.035 | ≦0.04 | 0.1-0.6 | 0.08-0.15 | ||
25CrMo4 | 17200 | DIN | 0.22-0.29 | 0.15-0.40 | 0.5-0.8 | ≦0.035 | ≦0.035 | 0.9-1.2 | 0.15-0.30 |
Mechanical Properties:
| Yield strength: | Tensile strength: | Elongation: | Rate of reduction in area: | Impact absorbing energy: | Material Brinell hardness: |
|---|---|---|---|---|---|
| ≥ 685 MPa | ≥ 885 MPa | ≥12% | ≥50% | ≥ 78 J | ≤ 197 |