24 July 2021 Gear Steel Bar
25CrMo Gear Steel Bar
25CrMo steel is a kind of Chinese alloy steel for engineering and mechanical structure use, for properies and uses, please refer to 20CrMo and 30CrMo. For specification, chemical composition, mechanical properties and equivalent.
Chemical Composition:
| C | Si | Mn | P | S | Cr | Mo | Cu |
|---|---|---|---|---|---|---|---|
| 0.22 to 0.29 | 0.17 to 0.37 | 0.60 to 0.90 | ≤ 0.030 | ≤ 0.030 | 0.90 to 1.20 | 0.15 to 0.30 | ≤ 0.30 |
Mechanical Properties:
- Yield strength: ≥ 600 MPa
- Tensile strength: ≥ 900 MPa
- Elongation: ≥14%
- Rate of reduction in area: ≥55%
- Impact absorbing energy: ≥ 68 J
- Material Brinell hardness: ≤ 229 (Annealed or high temperature tempered steel rod)
- Sample size: 25mm
Heat treatment：
First quenching heating temperature: 870 °C (Coolant: water, oil)
Tempering heating temperature: 600 °C (Coolant: water, oil)
Equivalent：
| China | USA | Germany | UK | Japan | France | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade |
| GB/T 3077 | 25CrMo | AISI SAE; ASTM A29/A29M | 4130 | DIN EN 10083-3 | 25CrMo4 | BS EN 10083-3 | 25CrMo4 | JIS G4053 | SCM430 | NF EN 10083-3 | 25CrMo4 |