If the tower crane consists of two wire ropes, you can choose wire ropes with the same structure but different twist directions, such as 8* 19S structure, with one left twist and one right twist, which can also achieve the purpose of anti-rotation.
China ranks first in the world with an annual output of 6,543,800 tons of steel wire rope. Phosphating steel wire rope is the first time in the field of steel wire rope in the world to restrain fretting fatigue and prolong its service life (fatigue life);
1. Phosphating coated steel wire rope (patented by China), after manganese or zinc-manganese phosphating treatment, the wear resistance and corrosion resistance of steel wire have jumped. The national standard GB/T11376-1997 describes in detail the wear resistance and rust resistance of phosphating film, and the oil plays an extremely excellent role in reducing friction for the penetration of phosphating film pores. It is an upgraded product of smooth steel wire rope, which is used in atmospheric environment. At present, the fatigue life of phosphating rope is about 3 times that of smooth wire rope. The fatigue life can be compared by fatigue test, and the service life can be greatly improved with the in-depth study of wear-resistant phosphating solution in the future. The phosphating film is 3-60g/m2, and the phosphatized steel wire is directly twisted without drawing.
Note: Zinc phosphating for wire drawing should not be confused with manganese phosphating for rope steel wire. This technology is suitable for producing all kinds of wire ropes, such as elevator wire ropes, important wire ropes, mine wire ropes, anti-rotation wire ropes, wire ropes for oil production, wire ropes for pile drivers, etc. (Baidu Library has phosphate coated steel wire rope for free download).
2. Galvanized steel wire rope, including hot dip galvanizing and electro-galvanizing. The thicker the zinc layer of direct hot-dip galvanized steel wire, the thicker the zinc layer, the stronger the corrosion resistance, and the longer the service time, the thinner the zinc electroplating. Because phosphating film has certain corrosion resistance, manganese phosphating film steel wire rope can be used instead of some kinds of thin galvanized steel wire rope, such as high temperature environment with atmospheric environment but humid air.
3. Stainless steel wire rope, steel wire rope twisted with stainless steel wire, such as 304 or 3 16 stainless steel, has higher corrosion resistance and is more expensive than hot-dip galvanized carbon steel wire rope. Manganese phosphating coating treatment of stainless steel wire (phosphating of stainless steel wire requires special phosphating formula) can also greatly prolong its service life.
4. Plastic coated steel wire rope: on the basis of steel wire rope, the outer layer of steel wire rope or strand rope is coated with polyethylene and polypropylene.
5. Smooth steel wire rope produced in UK 1834 and China Tianjin No.1 Steel Wire Rope Factory1939 (bankrupt in 2005) will be completely eliminated with a large number of phosphating coated steel wire ropes entering the market.
Manganese phosphating coated steel wire rope is preferred for atmospheric environment, and hot dip galvanized-phosphating double coated steel wire rope is preferred for corrosive environment.
Please refer to GB/T29086-20 12 "Safe Use and Maintenance of Wire Ropes" and check and scrap according to GB/T5972-2009 "Maintenance, Installation, Inspection and Scrapping of Crane Wire Ropes".