China · GB
U74
GB 2585:1981 — Technical requirements for 38kg/m to 50kg/m steel rails for railway
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.67 | 0.8 | ||
| Mn | 0.7 | 1 | ||
| P | 0.04 | |||
| S | 0.05 | |||
| Si | 0.13 | 0.28 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| sections, hot rolled, quenched | ≤785 | ≤9 |