1. Raw materials and semi-finished products
1) It is required that the surface of the steel wire should not have obvious defects such as scratches, folds, flashes and micro-cracks.
2) The decarburized layer on the surface of the wire rod and steel wire is a very weak part, and its thickness is generally required not to be greater than 1.5% of the diameter.
3) It is required that the metallographic structure of the raw material (high-speed wire rod) is dominated by sorbite (volume fraction 85%) after the completion of hot rolling and controlled cooling, and the rest must be pearlite.
4) In order to ensure the corrosion resistance of galvanized galvanized steel wire rope, the commonly used protection method of rope making wire is galvanized, and the most commonly used method is electroplating.
2. Drawing process
1) When formulating the wire drawing process, the dimensional tolerance and ovality of the semi-finished wire must be carefully selected.
2) Reasonable selection of the pass compression ratio, and on the premise of meeting the production efficiency, the multi-pass small compression ratio process is adopted.
3) Ensure sufficient cooling and lubrication to prevent surface scratches and excessive temperature rise during drawing, which will cause plasticity to drop.
4) There are certain requirements for the strength and chemical composition of the steel wires in different layers of the galvanized galvanized steel wire rope strands. The carbon content of the outer steel wire should be slightly lower than that of the inner steel wire, so that it has better toughness, and the manganese content can be slightly higher to increase the wear resistance and not easily break.
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