Can Crane Rails Be Replaced by Heavy Rails?

Why They Cannot Be Interchanged

Although crane rails such as QU120 and QU100 and ordinary heavy rails such as 50 kg and 60 kg railway rails both belong to the rail category, they differ significantly in design purpose, structural performance and operating environment, and therefore cannot be used interchangeably.

Load-Bearing Design Difference

Crane rails are used for the tracks of port cranes, overhead cranes or rail-mounted container gantry cranes, which must withstand high concentrated wheel pressure and frequent start-stop impacts. Ordinary heavy rails primarily carry evenly distributed loads from trains, with much lower impact frequency and local pressure than crane rails. Using ordinary heavy rails in place of crane rails may result in head indentations, deformation or cracks, seriously affecting crane operation safety.

Cross-Section and Structure Difference

Crane rails have thick cross-sections, wide rail heads and thick webs, optimized for concentrated load distribution, whereas heavy rails are designed according to train track operation standards with smaller wheel-rail contact surfaces and thinner webs. Structural mismatch causes concentrated crane wheel pressure on a smaller contact area, increasing rail wear and fatigue risk. The QU70 section has a height of 120 mm and a weight of 52.8 kg/m, the QU100 has a height of 150 mm and a weight of 88.96 kg/m, and the QU120 has a height of 170 mm and a weight of 118.1 kg/m, while heavy rails range from 38 kg/m at 134 mm height to 60 kg/m at 176 mm height.

Material and Treatment Difference

Crane rails are typically made of high-manganese steel or U71Mn steel, and undergo heat treatment and quenching to enhance wear resistance and fatigue strength. The U71Mn steel has a carbon content of 0.65 to 0.76 percent, manganese of 0.70 to 1.40 percent, silicon of 0.15 to 0.58 percent and a tensile strength of at least 880 MPa. Although ordinary heavy rails have good wear resistance, they lack sufficient fatigue life under high-frequency impact conditions, and long-term use may lead to cracks or track misalignment.

FAQ

Q1: Can ordinary heavy rails replace crane rails?
A: No, they differ in design purpose, structure and operating environment.

Q2: What happens if heavy rails are used on crane tracks?
A: Head indentations, deformation or cracks may occur, affecting crane safety.

Q3: How do crane rails differ structurally?
A: They have thicker cross-sections, wider heads and thicker webs for concentrated loads.

Q4: What steel is used for crane rails?
A: High-manganese steel or U71Mn steel with heat treatment and quenching.

Q5: Which crane rail section should be used for heavy equipment?
A: QU100 and QU120 are used for medium, heavy and extra-large equipment.

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