The right cross twist is ZS, see the national standard GB8918-2006 Steel Wire Rope for Important Purposes, page 3. This standard can be downloaded online.
The main varieties of domestic steel wire ropes are as follows:
1. Phosphated coated steel wire rope (Chinese patent). The steel wire is treated with manganese and zinc-manganese phosphating. The wear resistance of the steel wire, The corrosion resistance has been comprehensively improved, and it is not easy to wear and rust. The fatigue life of phosphate-coated steel wire rope is 3-4 times that of smooth steel wire rope with the same structure (under comparable conditions in the laboratory), surpassing imported steel wire ropes. Phosphated-coated steel wire rope is comprehensively replacing all kinds of steel wire ropes. Smooth-like steel wire ropes can also be used instead of galvanized steel wire ropes with thin zinc layers (corrosion resistance can be tested through salt spray tests). Because of their extremely long service life, the unit cost of phosphating-coated steel wire ropes is only 30-45% of that of smooth steel wire ropes. %, better quality stability and reliability.
2. Galvanized steel wire rope, including hot-dip galvanizing and electro-galvanizing. The thicker the galvanized zinc layer, the stronger the corrosion resistance. The thickness of the zinc layer is expressed in grams/square meter.
3. Stainless steel wire rope, mainly 304 or 316 stainless steel, which has excellent anti-corrosion effect but is expensive
4. Plastic-coated steel wire rope, based on carbon steel wire rope, with an outer layer Coated with polyethylene, polypropylene or nylon
5. Smooth steel wire ropes have a short service life and a sharp drop in market demand, and are being completely eliminated by phosphate-coated steel wire ropes.
For lifting machinery used in atmospheric environments, manganese-based phosphating-coated steel wire ropes are preferred, in heavily corrosive environments, hot-dip galvanized-phosphating double-coated steel wire ropes are preferred, and offshore steel wire ropes are preferred in seawater. When purchasing, please note that the name of the steel wire rope must be indicated on the purchase invoice, such as phosphate-coated steel wire rope or 316 stainless steel wire rope, to prevent unscrupulous companies from infringing on their legitimate rights and interests with counterfeit products. In addition, patented products generally have patents on the outer packaging of the steel wire rope. No. spray marking, the warranty document should have main technical indicators, such as the type of phosphate coating and film weight (the weight, wear resistance, corrosion resistance, etc. of the phosphating film have an important impact on the service life of the steel wire rope), which are for reference only.