QU100 Crane Rail Steel Grade
QU100 rails are manufactured from U71Mn high-manganese rail steel, selected for its strength, wear resistance, and fatigue performance under heavy crane loads.
| U71Mn | Mechanical Property | Chemical Composition |
| Yield strength | Tensile strength | Elongation | Hardness | C | Si | Mn | S | P | Cr | Ni | Cu |
| MPa | kg/mm² | MPa | kg/mm² | min | HB | ≤ | ≤ | ≤ | ≤ | ≤ |
| | | ≥880 | | 9% | | 0.65-0.76 | 0.15-0.35 | 1.10-1.40 | 0.030 | 0.030 | 0.25 | 0.25 | 0.25 |
Material characteristics include:
- High resistance to plastic deformation under extreme wheel pressure
- Strong impact toughness for start-stop and braking cycles
- Stable hardness profile for long-term rail head performance
- Proven reliability in harsh industrial and outdoor environments