China · GB
U74
GB 2585:2007 — Technical requirements for 38kg/m to 50kg/m steel rails for railway
Chemical composition
wt% · log scale- min – max range
- typical value
Mechanical properties
value range by conditionChemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.68 | 0.79 | ||
| Cr | 0.15 | |||
| Cr+Ni+Cu+Mo | 0.35 | |||
| Cu | 0.15 | |||
| Cu+10Sn | 0.35 | |||
| Mn | 0.7 | 1 | ||
| Mo | 0.02 | |||
| Nb | 0.01 | |||
| Ni | 0.1 | |||
| P | 0.03 | |||
| S | 0.03 | |||
| Sb | 0.02 | |||
| Si | 0.13 | 0.28 | ||
| Sn | 0.04 | |||
| Ti | 0.025 | |||
| V | 0.03 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| rails, hot rolled | ≥780 | ≥10 |