A steel wire rope is made by twisting several independent steel wires into strands, which are then twisted around the core of the steel wire rope.

　　Steel wire rope is mainly composed of steel wire, rope strand, rope core, and rope grease. Steel wire rope is a spiral structure formed by twisting steel wires according to certain rules, which is the basic unit of steel wire rope.

　　According to the cross-sectional shape of the strand, there are circular and irregular strands. Except for sealed wire ropes, all wire ropes are multi-stranded. The nature and quantity of wire breakage in steel wire ropes: For 6-strand and 8-strand steel wire ropes, wire breakage mainly occurs on the surface. For multi-layer strand steel wire ropes, this is different, as most of the wire breakage occurs internally, making it an "invisible" fracture. Local aggregation of broken wires: If the broken wires are tightly packed together to form local aggregation, the wire rope should be scrapped. If such broken wires are concentrated within the rope length range of less than 6d, or in any strand of the rope, even if the number of broken wires is less than the values listed in the table, the steel wire rope should still be scrapped. The increase rate of broken wires and rope strand breakage: Fatigue is the main cause of wire rope damage, while broken wires only begin to appear after a period of use, but the number of broken wires gradually increases and the time interval becomes shorter and shorter.

　　In this case, in order to determine the increase rate of wire breakage, it is necessary to carefully inspect and record the increase in wire breakage. When the rope diameter significantly decreases due to damage to the core, the wire rope should be scrapped. Minor damage, especially when the stress in all strands is in good balance, may not be apparent using the usual inspection method. However, this situation can cause a significant decrease in the strength of the wire rope. Steel wire ropes are divided into point contact steel wire ropes, line contact steel wire ropes, surface contact steel wire ropes, multi-layer non rotating steel wire ropes, special-shaped steel wire ropes (triangular, fan-shaped, elliptical, and flat), fully filled steel wire ropes, coated steel wire ropes, etc.