Upgrading the production process of steel wire rope slings to strengthen the safety defense line of industrial lifting

Release Time:

Mar 18,2025

Recent upgrades in the production process of wire rope lifting slings, including precision weaving technology and advanced heat treatment, have significantly enhanced their load-bearing capacity and safety performance.

As a core load-bearing tool in the industrial lifting field, the production process of wire rope lifting slings is advancing rapidly towards refinement and standardization. In the raw material selection stage, high-strength galvanized steel wires are now preferred. Through multiple wire drawing processes, the diameter error of the steel wires is controlled within ±0.02mm, ensuring uniform and stable tensile strength of each steel wire, with a basic strength of over 1770MPa, laying a solid foundation for the overall load-bearing capacity of the slings.

In the weaving and forming stage, intelligent weaving equipment has replaced traditional manual operations, enabling precise control of strand arrangement. Taking the common 6-strand 19-wire sling structure as an example, the equipment can adjust the weaving tension in real time, keeping the stress deviation of each strand within 5%, effectively avoiding early damage caused by local stress concentration. At the same time, the joint processing technology has been innovated, using laser welding instead of traditional riveting. The tensile strength at the joint has increased by more than 30%, and the surface is smooth without protrusions, reducing wear between the sling and the lifted object during lifting.

The optimization of heat treatment technology has further improved the performance of the slings. Through continuous isothermal quenching, the internal crystal structure of the slings is more uniform, and the toughness is increased by 25%. It can still maintain stable load-bearing capacity in low-temperature environments (-40℃) or high-temperature environments (200℃), breaking the limitation of traditional slings on operating environments. In addition, the surface protection treatment is more comprehensive. In addition to conventional galvanizing, polyvinyl chloride (PVC) coating and polyurethane (PU) coating options have been added. The former can enhance corrosion resistance, suitable for humid and salty environments such as chemical industry and marine; the latter can improve wear resistance, adapting to the lifting of objects with rough surfaces such as steel and stone.

A full-process monitoring system has been introduced in the quality inspection link. Each batch of slings must undergo three inspections: tensile test, bending test and fatigue test. In the tensile test, a static load test of 2.5 times the rated load is conducted to ensure no permanent deformation of the slings; the fatigue test simulates 1000 cycles of lifting to verify its long-term use stability. These upgrades in production processes have made wire rope lifting slings play a more important role in scenarios such as heavy machinery installation, bridge construction, and port freight, becoming the "solid backbone" of industrial safe lifting.

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