Method for improving pickling effect of wide and thick cold plate stainless steel

Abstract

The invention relates to the technical field of steel rolling. The invention provides a method for improving the pickling effect of wide and thick cold plate stainless steel, and the method comprises the following steps of: (1) Na2SO4 electrolysis technology; (2) HNO3 electrolysis technology; (3) a scrubbing machine, specifically, adjusting the rolling reduction of a brush roller, and controlling the quality of the brush roller and the rolling reduction parameters of the brush roller to reduce medium consumption; (4) a process medium; and (5) an operation method. By the adoption of the method, the problems that the surface of the 400-series stainless steel wide and thick cold plate strip steel is poor in acid pickling and not brushed cleanly are obviously solved, heavy washing materials are greatly reduced, the surface quality of the strip steel is greatly improved, the product image is greatly improved, and the market competitiveness of products is improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for improving the pickling effect of stainless steel with low energy consumption by adjusting and optimizing the pickling speed, improving the electrolytic sodium sulfate process, and improving the medium use standard in the annealing and pickling line of cold-rolled finished products. Background technique [0002] 430 stainless steel, also known as 1Cr17 stainless steel, is a ferritic stainless steel with good corrosion resistance. Its chloride corrosion resistance is better than that of general chromium-nickel austenitic stainless steel, so it is widely used in separator materials, Japanese It can be called high-quality and low-cost stainless steel for decorative accessories, car decoration, low-temperature dilute acid storage tanks, etc. However, due to the inherent shortcomings of ferritic stainless steel, it is difficult to produce, so my country cannot produc...

AI Technical Summary

Problems solved by technology

However, due to the inherent shortcomings of ferritic stainless steel, it is difficult to produce, so my country cannot produce it on a large scale

Especially when the thickness is ≥ 2.5mm and the width is ≥ 1300mm, due to various reasons such as Na2SO4 electrolysis process, brushing machine status, mixed acid residual acid, etc., the surface of the steel strip is not brushed, and the pickling effect is poor

When saving, it is necessary to reduce the process speed and rewash twice or even three times to solve the problem. The rewash rate once reached more than 35%. On the one hand, this caused the surface quality of the product to be unstable. On the other hand, rewashing caused waste of production capacity and energy consumption.

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