U71Mn, a high-manganese steel developed for rail transit and heavy-duty applications, is widely used in the manufacturing of QU series crane rails, such as QU70, QU80, QU100, and QU120. At GNEE RAIL, QU crane rails are manufactured in strict accordance with GB (Guobiao) standards, ensuring excellent strength, wear resistance, and impact resistance. QU rails such as QU70, QU80, QU100, and QU120 are extensively used in port cranes, metallurgical cranes, and overhead traveling cranes in workshops. GNEE RAIL offers a full range of QU crane rails to meet various industrial requirements.
Performance Advantages of U71Mn
U71Mn is a low-carbon, high-manganese steel known for the following key properties:
- Tensile strength ≥ 880 MPa, ensuring mechanical stability of the rail under high load conditions;
- High hardness (HB260–320), significantly improving the abrasion resistance of the rail;
- Excellent impact toughness, allowing the crane rail to withstand repeated dynamic loads from crane operations;
- Good weldability, making it suitable for rail joint welding and repair applications.
| Chemical Components % | |||||||||||
| Mark | C | S1 | Mn | P | S | ||||||
| U71Mn | 0.65-0.77 | 0.15-0.35 | 1.0-1.5 | ＜0.040 | ＜0.040 | ||||||
These characteristics make U71Mn an ideal material for manufacturing large cross-section, high-strength QU rails, particularly in crane rail systems subject to frequent starts and stops and concentrated loads.
Application of U71Mn QU series crane rails
The QU series crane rails, made of U71Mn, are widely used in the following applications:
Port terminal container crane rails (RTG and RMG rail systems)
Metallurgical industry casting crane and steelmaking bridge crane rail systems
Power plant coal yard rail transport systems
Shipyard slideways and gantry crane rails
Heavy industry warehousing and logistics rail transport trolleys
QU Series Rail Models
GNEE RAIL offers a full range of QU rail products based on U71Mn material. We provide customized rail lengths, cutting and punching, end machining, surface treatment, and other services tailored to project needs. We also offer matching rail fastening systems.
| Rail Type | SIZE(mm) | theoretical weight | |||||||||
| height | bottom width | head width | waist depth | ||||||||
| Crane rail | QU70 | 120 | 120 | 70 | 28 | 52.8 | |||||
| QU80 | 130 | 130 | 80 | 32 | 63.69 | ||||||
| QU100 | 150 | 150 | 100 | 38 | 88.96 | ||||||
| QU120 | 170 | 170 | 120 | 44 | 118.1 | ||||||
GNEE RAIL also supplies the following related products:
- Mining rails, industrial light rails, and heavy rails (e.g., 18kg, 24kg, and 30kg)
- Various types of elastic rail fasteners: such as SKL, KPO, E clips, and Crane rail clips
- Rail fasteners including spikes, bolts and nuts, iron pads, rubber pads, and rail anchors
| Classification | Height(mm) | Head (mm) | Bottom (mm) | Thick(mm) | Weight (kg/m) | |
| Light Rail | 8 KG/M | 65 | 25 | 54 | 7 | 8.42 |
| 9 KG/M | 63.5 | 32.1 | 63.5 | 5.9 | 8.94 | |
| 12 KG/M | 69.85 | 38.1 | 69.85 | 7.54 | 12.2 | |
| 15 KG/M | 79.37 | 42.86 | 79.37 | 8.33 | 15.2 | |
| 18 KG/M | 80 | 40 | 80 | 10 | 18.06 | |
| 22 KG/M | 93.66 | 50.8 | 93.66 | 10.72 | 22.3 | |
| 24 KG/M | 107 | 51 | 90 | 10.9 | 24.46 | |
| 30 KG/M | 107.95 | 60.33 | 107.95 | 12.3 | 30.1 | |
| Heavy Rail | 38 KG/M | 134 | 68 | 114 | 13 | 38.733 |
| 43 KG/M | 140 | 70 | 114 | 14.5 | 44.653 | |
| 45 KG/M | 145 | 67 | 126 | 14.5 | 45.546 | |
| 50 KG/M | 152 | 70 | 132 | 15.5 | 51.514 | |
| 60 KG/M | 176 | 73 | 150 | 16.5 | 60.64 | |