If the wire rope is broken to a certain extent, the rope can only be replaced with a new one, and the broken wire cannot be repaired. Rope-making steel wire is a cold-drawn steel wire with very high strength. Even if the broken wires can be welded together, its strength is affected by heat and metallographic structure and is far lower than that of cold-drawn steel wire. It is for reference only
China's annual steel rope production of 1.8 million tons ranks first in the world. Phosphate-coated steel wire ropes are a revolutionary innovative technology in the world's steel wire rope field. The service life (fatigue life) has greatly increased. Smooth steel wire ropes have been completely eliminated and phosphate-coated steel wire ropes have been fully adopted. The era of steel wire ropes:
1. Phosphated coated steel wire rope (Chinese patent), which has been treated with manganese or zinc-manganese phosphating. The surface wear resistance and corrosion resistance of the steel wire have been greatly improved. GB/T11376-1997 Metal The wear-resistant and anti-rust effects of the phosphate conversion coating are described in detail in the national standard of the phosphate conversion coating. Lubricating grease penetrates into the pores of the phosphating film and has an extremely excellent friction-reducing effect, effectively inhibiting the wear of the steel wire surface inside the steel wire rope. It is a smooth The upgraded product of surface steel wire rope can replace the galvanized steel wire rope that is first plated and then pulled out with a thin zinc layer. At present, the fatigue life of phosphated rope is about 3 times that of smooth rope, and the best is 4 times. The fatigue life can be compared through fatigue tests. , in the future, with in-depth research on wear-resistant phosphating liquid, the service life can be greatly improved. The phosphating film is 3-60 g/m2. The steel wire is directly twisted into a wire rope without drawing processing after phosphating.
Note: Do not confuse zinc-based phosphating for drawing with manganese-based or zinc-manganese-based phosphating for rope making wire. This technology is suitable for the production of a variety of wire ropes, such as elevator wire ropes, important purpose wire ropes, mining wire ropes, anti-rotation wire ropes, wire ropes for oil production, wire ropes for pile drivers, etc. It has a longer service life, lower usage costs, and better stability. . .
2. Galvanized steel wire ropes include hot-dip galvanizing and electro-galvanizing. The direct-lift hot-dip galvanized steel wire has a thicker zinc layer. The thicker the zinc layer, the stronger the corrosion resistance and the longer it will last. Electroplated zinc is thinner. Since the phosphating coating has certain anti-corrosion properties, manganese phosphating coated steel wire ropes can be used instead of some types of galvanized steel wire ropes with thin zinc layers, such as high-temperature environments with atmospheric but humid air, while hot-dip galvanizing-phosphating double The corrosion resistance of coated steel wire ropes is further improved.
3. Stainless steel wire rope, a steel wire rope twisted with stainless steel wire, such as 304 or 316 stainless steel, has higher corrosion resistance than hot-dip galvanized carbon steel wire rope, and is relatively expensive. The stainless steel wire is treated with manganese phosphorus Chemical coating treatment (phosphating stainless steel wire requires a special phosphating formula) can also greatly extend the service life.
4. Plastic-coated steel wire rope. Based on the steel wire rope, the outer layer of the steel rope or strand rope is coated with polyethylene or polypropylene.
5. Smooth steel wire ropes were produced in the United Kingdom in 1834. In China, Tianjin No. 1 Steel Wire Rope Factory began production in 1939 (it went bankrupt in 2005). As phosphate-coated steel wire ropes enter the market in large quantities, they will be phosphorized. Chemically coated steel wire ropes will be completely eliminated.
6. Steel wire ropes for marine engineering mooring, relevant standards are in the process of formulation and approval
7. Cable wire ropes
Manganese phosphating coating is preferred for atmospheric environment For steel wire ropes, hot-dip galvanized-phosphated double-coated steel wire ropes are preferred in corrosive environments. Marine steel wire ropes are preferred in seawater environments because they have longer service life and lower usage costs.