QU70 Rail Dimension
Specification of crane rail QU70:
Model | Section size (mm) | Section size(x.1) | Typical length(n) | Theoretical weight(kz/m) | Material |
Rail height | Base width | Head width | Web thickness |
70kg | 120 | 120 | 70 | 28 | 67.30 | 12 | 52.77 | U71MN U75V |
Other crane rail on sale:
Model | Section size (mm) | Section size(x.1) | Typical length(n) | Theoretical weight(kz/m) | Material |
Rail height | Base width | Head width | Web thickness |
80kg | 130 | 130 | 80 | 32 | 81.13 | 12 | 64.41 | U71MN U75V |
100kg | 150 | 150 | 100 | 38 | 113.32 | 12 | 89.05 |
120kg | 170 | 170 | 120 | 44 | 150.44 | 12 | 118.5 |
Product Description
QU70 rail track is a load-bearing track designed for 50-100 ton bridge/gantry cranes. It complies with the Chinese metallurgical industry standard YB/T 5055-2014 and is rolled from U71Mn or U75V special steel. QU70 is a specific size of QU series crane rails according to Chinese standards. The number “70” refers to the head width of the crane rail. Therefore, the head width of QU70 rail is 70 mm.
Gnee not only provide QU70 rails of Chinese standard, but also QU80, QU100, QU120 crane rails. And fasteners matching the rails, such as crane rail clips, crane bolts, etc.
Chemical Composition & Mechanical Properties Of U71Mn And U75V
| Property | U71Mn | U75V |
| Chemical Composition | | |
| Carbon (C) | 0.65%~0.77% | 0.70%~0.80% |
| Manganese (Mn) | 0.70%~1.20% | 0.75%~1.05% |
| Silicon (Si) | 0.15%~0.35% | 0.50%~0.70% |
| Vanadium (V) | ≤0.03% | 0.04%~0.12% |
| Phosphorus/Sulfur (P/S) | ≤0.025% | ≤0.025% |
| Mechanical Properties | | |
| Tensile Strength (MPa) | ≥880 | ≥980 |
| Brinell Hardness (HB) | 260~300 | 280~320 |
| Elongation (%) | ≥10 | ≥10 |
| Service Life | Medium (≈6-8 years) | High (≥12 years) |
Applications Of QU70 Crane Rail
Port crane
QU70 with 80μm hot-sprayed zinc, 3 years of rust-free, reducing annual maintenance frequency.
Factory workshop rail
QU70 pre-grinding Ra≤1.6μm + laser calibration, greatly reducing hoisting shaking.
Extreme cold area crane rail
QU70 cold area gap expanded to 6mm + bevel joint splint, -30℃ normal operation.
Quick installation
QU70 prefabricated hole + 12m fixed-length rail, quickly complete the project laying.
Advantages Of Gnee's OU70 Rail
Why choose Gnee’s crane rail QU70? Our crane rails are not only reliable in quality, but also the best choice in cost and delivery speed.
Extreme weather protection
- 500-hour salt spray certification: QU70 track passes ASTM B117 standard test and adapts to high salt spray and high humidity environments in ports;
- Dual anti-corrosion system: The base material uses U71Mn/U75V special steel + hot-sprayed zinc coating (≥80μm) to increase service life;
- Extended maintenance cycle: The maintenance-free cycle under coastal conditions is up to 3 years, reducing downtime costs
Efficient installation
- Modular design: 12-meter fixed-length track + prefabricated bolt holes, installation speed increased by 50%
- Seamless expansion capability: supports kilometer-level track splicing, adapting to warehouse expansion needs
Achieve stable load-bearing
- Hard-core material guarantee: rail head hardness 260-320HB (U71Mn/U75V), tensile strength ≥880MPa;
- Hundred-ton load-bearing verification: passed GB/T 10183 dynamic load test, suitable for 80~100 ton bridge cranes;
- Heavy-duty engineering verification: Shuohuang Railway, Guinea mines and other projects verify 80-100 ton stable load.
High reliability and safety structure
- Physical anti-derailment design: 28mm thickened rail waist + 120mm wide rail bottom, torsional strength increased by 25% (national standard YB/T 5055);
- Dynamic gap control: 1-6mm reserved for expansion joints (4-6mm in cold areas), equipped with 45° inclined joint splints to eliminate the risk of thermal expansion and deformation;
- Shock reduction and noise reduction guarantee: The composite rubber pad is compressed by 2-3mm, the impact noise is reduced by 20 decibels, and the life of the crane wheel group is extended
FAQ About QU70 Rail
The following are some questions related to QU70 crane rail. If you have other questions, please feel free to contact us.
How to choose between QU70 and QU80?
- QU70 has a load-bearing capacity of ≤100 tons and a wheel diameter of ≤700mm; if the load-bearing capacity exceeds the limit, QU80 (load-bearing capacity of 150 tons+) should be selected.
Which one is more suitable for cold regions, U71Mn or U75V?
- U71Mn is preferred: it has better low-temperature toughness and avoids brittle fracture; if wear resistance is taken into account, U75V can be selected but the welding process must be strictly controlled.
Is a pressure plate required for track installation?
- Yes! QU70 needs to be equipped with a national standard 6A-4 pressure plate (size 156×70×16mm), which is fixed to the concrete beam by bolts and compresses the rubber pad by 2~3mm to reduce shock.
How to deal with the joint?
- Leave a gap of 1~2mm at normal temperature, and expand it to 4~6mm in cold areas to prevent thermal expansion and deformation; a 45° inclined joint or a four-hole plywood is required at the expansion joint.
What are the key points of daily maintenance?
- Monthly straightness test (wire vertical deviation ≤ ±5mm); Quarterly flaw detection for cracks (especially welding joints); Timely clean rail waist rust to avoid stress concentration
