Technological method for eliminating cold rolling coil corrosion defects

Abstract

The invention belongs to the technical field of surface defect treatment of cold rolling precision strip steel, and particularly relates to a technological method for eliminating cold rolling coil corrosion defects. The technological method for eliminating the cold rolling coil corrosion defects includes the following steps that (1) a temperature program is set; (2) an atmosphere program is set in a segmented mode according to the changing process of the steel coil temperature; and (3) heat preservation time is set. The technological method has the beneficial effects that (1) the bad influence on usability of annealed steel coils can be avoided; (2) the temperature range within which hydrogen and iron oxide carry out a reduction reaction is accurately found; and (4) the heating program is set based on hydrogen reduced iron oxide, heating is ended immediately when the reduction reaction is ended, full-speed heating is adopted, the technological period is shortened, the defect coil treatment efficiency is improved and treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of surface defect treatment of cold-rolled precision steel strips, and in particular relates to a process method for eliminating corrosion defects of cold-rolled coils. Background technique [0002] At present, most cold-rolling plants are faced with the corrosion of cold-rolled coils caused by the high air humidity and high ambient temperature in the intermediate warehouse, or the steel coils are corroded by water due to some factors when the steel coils are placed in the warehouse. , Especially in the months with high air humidity, from June to September, the cold-rolled coils stay in the intermediate warehouse for 1-2 days and then begin to rust from both sides of the strip to the middle. Once rust occurs, it can only be judged once, and the customer has no room for negotiation. Most of the cold rolling mills treat the corroded coils according to the original annealing process at high temperature, and th...

AI Technical Summary

Problems solved by technology

There are also a small number of cold-rolling factories that are directly judged as defective products and sold at a reduced price, resulting in heavy losses

[0003] Now the metallurgical industry has entered the era of meager profits. As users have higher and higher requirements for the surface quality of cold-rolled sheets, and the calls of various cold-rolled mills to reduce costs and increase efficiency are getting higher and higher, and the corrosion defects of cold-rolled coils are judged as defective products. The practice of rolling is very regrettable, and it has also caused huge economic losses

However, the practice of returning to the furnace directly according to the original annealing process not only increases the cost and time investment, but also does not receive good results, and even brings other defects during the high temperature treatment process.

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