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

A technology of stainless steel and cold plate, which is applied in the field of steel rolling, can solve the problems of slowing down the process speed, poor pickling effect, and incapability of large-scale production, so as to improve the surface quality of strip steel, improve the problem of non-cleaning, and improve market competitiveness. Effect

CN114086188APending Publication Date: 2022-02-25SHANXI TAIGANG STAINLESS STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-02-25

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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.
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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...

Examples

Embodiment 1

[0049] The finished product specification is 2.5*1500mm ferritic 430 stainless steel cold-rolled steel strip.

[0050] 1) The hot-rolled raw material coils are prepared by using a hot continuous rolling unit + a bell-type furnace hot annealing and pickling unit.

[0051] 2) The hot-rolled coil is rolled to 2.5mm by a 20-high rolling mill, and then annealed and pickled on the finished product cold annealing and pickling unit, and the surface of the steel coil is pickled after being released from the furnace.

[0052] 3) Since the ferrite is more sensitive to the acid concentration, the residual acid in the mixed acid section of the nickel steel and the uncleanness of the acid medium are more sensitive, so the alternate production of chromium-nickel steel will have a bad effect on the pickling surface, and the best production method can be found out. The best time is Na 2 SO 4 Immediately after the tank body of the system is thoroughly rinsed, it can avoid residual acid in the...