Rust removing technology for black-skin steel reel

Abstract

The invention provides a rust removing technology for a black-skin steel reel. The rust removing technology comprises the following steps that the black-skin steel reel is subjected to scale braking rust removing through a four-station scale breaker, a steel belt passes through two bending roller sets, the steel belt is bent through simultaneous operation of upper bending rollers and lower bending rollers, the elongation rate of the steel belt is increased, and the extension difference between rust scales and a base material is increased, so that the opening degree of cracks of the rust scales on the surface of the steel belt is increased, and meanwhile edge waves of the steel belt are eliminated; and then the steel belt passes through two straightening roller sets, and through simultaneous operation of upper straightening rollers and lower straightening rollers, C-shaped warped parts and L-shaped warped parts of the steel belt are eliminated; the rust scales cracked on the surface of the steel belt subjected to rust removing through the four-station scale breaker are removed in the mode of grinding and scrubbing; and the rust scales on the surface of the ground and scrubbed steel belt are removed in an electrolysis mode, during electrolysis, the rust scales on the surface of the steel belt are converted into sediments of Cr(OH)3 and Fe(OH)3 to be removed, and the rust scales on the surface of the steel belt are peeled off through O2 and H2 generated in the electrolysis process. According to the rust removing technology for the black-skin steel reel, the rust removing capacity of the whole technological process is reinforced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of stainless steel processing, in particular to a derusting process for black steel coils. Background technique [0002] The rust removal process of traditional black steel coils is as follows: [0003] Black steel coils go through annealing furnace → three-station phosphorus breaking machine → sand blasting machine → sulfuric acid pickling → mixed acid pickling [0004] Black-skinned steel coils are difficult to remove because of their thick rust, so the rust removal method generally adopts a combination of mechanical rust removal and chemical rust removal. However, when the traditional derusting process of black steel coils uses a sandblasting machine for mechanical derusting, the steel balls of the sandblasting machine hit the surface of the steel strip to form dense pits, so that the surface roughness (Ra) of the steel strip Increasing to 3.0-4.0 will have a negative impact on the quality of subsequent cold-roll...

AI Technical Summary

Problems solved by technology

However, when the traditional derusting process of black steel coils uses a sandblasting machine for mechanical derusting, the steel balls of the sandblasting machine hit the surface of the steel strip to form dense pits, so that the surface roughness (Ra) of the steel strip Increasing to 3.0-4.0 will have a negative impact on the quality of subsequent cold-rolled products; even after the steel strip is mirror-polished, point-like defects left by sandblasting can still be seen on the surface of the steel strip, resulting in reduced cold-rolled products available range of

In addition, during the sulfuric acid pickling process, due to the difference in the degree of chemical reaction between the location of the scale and the location of the crack, the color and roughness of the surface of the steel strip after pickling are uneven, which affects the direct use of the product, and Lower quality standards for subsequent cold-rolled final products

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