GB QU crane rails play a key role in industrial lifting operations, and their hardness is an important indicator for measuring performance. QU crane rails are usually made of alloy steel materials such as U71Mn and U75V. Taking U71Mn as an example, with the appropriate alloy ratio, this material has excellent comprehensive performance. After heat treatment, the hardness is significantly förbättras, och det kan effektivt motstå den ofta rullningen av hjulen när kranen körs .
| Kemiska komponenter % | |||||||||||
| Markera | C | S1 | Mn | P | S | ||||||
| U71mn | 0.65-0.77 | 0.15-0.35 | 1.0-1.5 | ＜0.040 | ＜0.040 | ||||||
| Kemiska komponenter % | |||||||||||||
| Markera | C | S1 | Mn | P | S | V | |||||||
| U75v | 0.71-0.80 | 0.50-0.70 | 0.75-1.05 | Mindre än eller lika med 0,025 | Mindre än eller lika med 0,025 | 0.04-0.12 | |||||||
Enligt relevanta standarder har olika typer av Qu Crane -skenor olika krav på hårdhet på grund av olika applikationsscenarier och lastkrav . Till exempel,Qu70 Railsare mostly used for cranes with relatively small lifting weights. After quenching and other treatments, the Brinell hardness of the rail head can generally reach HB280-HB320. This hardness range can ensure that the rail has a certain toughness while providing good wear resistance for the frequently contacted rail head, reducing wear and extending the service life of the Rail .
När kranens lyftvikt ökar har skenor som Qu100 och Qu120 som används för stora och tunga kranar högre krav på hårdhet .QU100 -järnväghas undergone special high-temperature quenching treatment, and the rail head Brinell hardness can reach HB300 - HB350, and some are even higher. The higher hardness allows the rail to withstand greater wheel pressure and impact force. When lifting heavy objects, the rail surface is not easy to be deformed, indented, and damaged, ensuring the smooth and safe operation of the kran .
I faktiska applikationer måste skenhårdheten rimligen matchas med kranhjulets hårdhet . Om skenhårdheten är för hög, kommer hjulslitaget att öka; conversely, the rail wear will accelerate. Therefore, precise control of the GB QU crane rail hardness is not only related to the durability of the rail itself, but also of great significance to the stability and reliability of the entire crane operation system. It is a key factor in ensuring the efficient and safe development of industrial lifting operations.