Method for manufacturing highly corrosion-resistant steel wire rope for fishery

Abstract

The invention discloses a method for manufacturing a highly corrosion-resistant steel wire rope for fishery. The method comprises the steps of selecting medium-and-high-carbon steel wire rods, conducting acid pickling, parkerising, drawing, patenting, redrawing and galvanizing in sequence, feeding steel wires into an open-fire furnace with a feeding speed of 20-28 m/min to improve the structure of the steel wires, and conducting alkali washing, water scrubbing, acid pickling and water scrubbing on the steel wires in sequence; conducting plating assisting, drying and galvanizing on the steel wires in sequence; conducting plating assisting and drying again and galvanizing an aluminum alloy layer, and drawing qualified steel wires again multiple times to obtain steel wires in the required specification; spooling the steel wires respectively, and stranding the steel wires to obtain wire strands; finally, twisting a rope core and the wire strands to obtain the steel wire rope. By the adoption of the manufacturing method, on the premise that corrosion resistance is improved, the steel wire rope with higher strength and high tenacity can be produced, and the service life of the steel wire rope for marine fishing is prolonged greatly.

Description

technical field [0001] The invention belongs to the technical field of steel wire ropes for fishery, and in particular relates to a manufacturing method of high anti-corrosion fishery steel wire ropes. Background technique [0002] So far, steel wires for fishery wire ropes in the domestic market mostly use galvanized as the protective coating of steel wires, that is, pure zinc layer. Seawater tests show that steel wires with pure zinc layer can play a more complete protective role when soaked in seawater. However, the seawater test cannot replace the environment in which the steel wire rope is in use. The time for the steel wire rope to be immersed in seawater is limited when operating at sea. The corrosion rate of galvanized steel wire is exacerbated. No matter in which environment, the corrosion resistance of pure zinc-coated steel wire is proportional to the thickness of the zinc layer. [0003] Domestic mainstream galvanizing methods are divided into two types, electro...

AI Technical Summary

Problems solved by technology

[0004] Therefore, all domestic steel wire manufacturers have worked hard on the thickness of the zinc layer, but the thickness of the zinc layer cannot be increased infinitely, and the excessive thickness of the zinc layer in hot-dip will cause local accumulation of the zinc layer on the surface of the steel wire. The zinc layer falls off during the manufacturing process

Existing zinc layer thickness restricts corrosion resistance of galvanized steel wire

[0005] In addition, in order to ensure the anti-corrosion effect of the steel wire rope, the thickness of the coating layer of the steel wire used for making the rope must be guaranteed in the production of domestic galvanized steel wire rope, so the method of first drawing and then plating is often used for production. Although the thickness of the zinc layer of the steel wire rope is guaranteed, the thickness of the steel wire The strength will drop sharply in the process of hot-dip galvanizing, and the toughness of the steel wire will decrease accordingly. Compared with the steel wire before plating, the bending will decrease 3-4 times and the twisting will decrease 8-10 times. In the investigation of the use of zinc steel wire ropes, most of the scrapping of galvanized steel wire ropes is caused by the early scrapping of steel wire ropes due to the low toughness of the steel wire ropes.

[0006] Pure aluminum coating can effectively solve the corrosion problem of steel wire rope. Experiments show that aluminum coating can form a passivation layer on steel wire, which can effectively alleviate the corrosion of steel wire in seawater, but aluminum coating cannot form an effective primary battery effect in seawater. The steel wire rope will inevitably wear out during the twisting process, causing the steel to be directly exposed in seawater, which will cause internal corrosion. The pure aluminum coating is not suitable for the field of steel wire for rope making

[0007] However, the current hot-dip galvanized and then hot-dip galvanized steel wire with aluminum rare earth alloy layer improves the corrosion resistance, but the strength and toughness of the steel wire cannot meet the requirements. The life of the steel wire rope is short, and it still cannot meet the strength, toughness, Life expectancy and many other requirements