Ferrite stainless steel processing method
A processing method and stainless steel technology, applied in the field of ferritic stainless steel processing, can solve problems such as unfavorable environmental protection, failure to meet customer requirements for dark color on the surface of materials, and increase processing costs, so as to protect the environment, reduce emissions, and save costs. Effect
Inactive Publication Date: 2015-05-06
ZHANGJIAGANG POHANG STAINLESS STEEL
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Problems solved by technology
However, there is no report on adopting sulfuric acid electrolysis in the pickling process.
Therefore, the existing pickling method increases the processing cost of the enterprise, is not conducive to environmental protection, and does not meet the customer's requirements for the dark color of the material surface
Method used
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Experimental program
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[0008] The ferritic stainless steel processing method of the present invention is introduced in detail below. The ferritic stainless steel after cold rolling by a 20-high rolling mill is uncoiled, degreased, annealed in a continuous annealing furnace, pickled, smoothed, and finished after coiling. The annealing temperature is 800°C to 1000°C. The pickling includes neutral salt and sulfuric acid electrolysis and mixed acid pickling to remove scale. The pickling sequence is as follows: first let the ferritic stainless steel enter the sodium sulfate with a specific gravity of 1.2 ± 0.05, sodium sulfate solution temperature is 75 ~ 80 ℃, PH value of 4 ~ 6 sodium sulfate solution electrolysis, electrolysis current is 5000 ± 200A, then clean the ferritic stainless steel and squeeze dry, then enter the sulfuric acid concentration of 60 ~ 80g / L, metal ions of 15-25g / L, electrolysis in sulfuric acid solution at a temperature of 40-45°C, the electrolysis current is 4000±200A, then the fe...
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Abstract
The invention discloses a ferrite stainless steel processing method, through which the requirements of surface dark color can be met and emission of a nitric oxide is reduced. The method comprises the following steps: uncoiling ferrite stainless steel which is coldly rolled by a twenty-high roll mill; degreasing, and annealing through a continuous annealing furnace; pickling, leveling, and reeling to form a finished product, wherein the annealing temperature is 800-1,000 DEG C; and the pickling step comprises electrolysis of neutral salt and sulfuric acid, mixing acid and pickling to remove a scale cinder. The ferrite stainless steel processing method has the advantages that removal of the scale cinder on a strip steel surface is finished; the requirements of surface dark color of a customer are met; emission of the nitric oxide is reduced; the cost is reduced; and the environment is protected.
Description
technical field [0001] The invention relates to a method for processing ferritic stainless steel. Background technique [0002] The existing ferritic stainless steel (such as 409L, 410L) cold-rolled annealing and pickling production process is annealing, sodium sulfate electrolysis, HNO3 electrolysis, mixed acid pickling (HNO3, HF), the main purpose of annealing is to harden the rolling process by heating Stainless steel is softened through recrystallization, and the main purpose of pickling is to remove oxide scale and obtain a passive film. [0003] After cold annealing of ferritic stainless steel, an oxide scale is formed on the surface, and its main components are oxides of Fe and Cr. The scale is removed by electrolytic pickling. Usually, a part of the scale can be removed through the electrolysis stage. However, the electrolysis of HNO3 in this process will produce a large amount of nitrogen oxides. The discharge of nitrogen oxides into the air will cause acid rain, ...
Claims
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IPC IPC(8): C25F1/06C23G1/08
Inventor 张华年石斌龙原米娜
Owner ZHANGJIAGANG POHANG STAINLESS STEEL