430 stainless steel and rolling method thereof

Abstract

The invention discloses 430 stainless steel and a rolling method thereof. The 430 stainless steel comprises, by weight, less than or equal to 0.04% of C, greater than or equal to 0.30% and less than or equal to 0.60% of Si, less than or equal to 0.45% of Mn, less than or equal to 0.030% of P, less than or equal to 0.005% of S, less than or equal to 16.50% of Cr, less than or equal to 0.045% of N, greater than or equal to 0.05% and less than or equal to 0.25% of Re, and the balance Fe and other inevitable impurities. The rolling method comprises the following specific steps of 1) heating, wherein the heating step is sequentially divided into a preheating section, a heating section I, a heating section II and a soaking section; 2) rough rolling, wherein a steel billet enters a rough rolling mechanism through a heat preservation conveying mechanism, and the rough rolling mechanism conducts primary rough rolling on the heated steel billet; 3) finish rolling, wherein after rough rolling is completed, the steel billet enters a finish rolling mechanism to be subjected to finish rolling treatment; 4) coiling; 5) uncoiling and welding; 6) annealing; 7) descaling and shot blasting; 8) acid pickling; 9) cleaning, wherein the surface of the stainless steel plate obtained after acid pickling is cleaned through a cleaning device; and 10) drying. Through the reasonable raw material ratio and rolling process, the high-quality stainless steel plate is obtained, and the surface quality of the stainless steel plate is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of stainless steel rolling, and in particular relates to a 430 stainless steel and a rolling method thereof. Background technique [0002] 430 stainless steel is rolled under the existing process conditions, and the energy consumption is generally relatively high; at the same time, it is affected by factors such as high temperature oxidation resistance, hot rolling temperature, roll roughness, and rolling reduction rate during the rolling process. The phenomenon of leather sticking to the roll is more serious, resulting in rough stripes on the surface of the steel strip; 1) Among them, under the same hot rolling conditions, the rolling reduction rate is directly related to the area of ​​the contact arc between the strip and the roll and the size of the rolling pressure; The larger the ratio, the longer the contact arc between the strip and the roll, the larger the contact area, and the greater the rolling pr...

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Problems solved by technology

[0002] 430 stainless steel is rolled under the existing process conditions, and the energy consumption is generally relatively high; at the same time, it is affected by factors such as high temperature oxidation resistance, hot rolling temperature, roll roughness, rolling reduction rate and other factors during the rolling process. The phenomenon of leather sticking to the roll is more serious, resulting in rough stripes on the surface of the steel strip; 1) Among them, under the same hot rolling conditions, the rolling reduction rate is directly related to the area of ​​the contact arc between the strip and the roll and the size of the rolling pressure; The larger the ratio, the longer the contact arc between the strip and the roll, the larger the contact area, and the greater the rolling pressure, which results in an increase in the bonding area between the strip and the roll, an increase in the bonding time, and an increase in the degree of difficulty in peeling off the strip and the roll , which is finally reflected in the more serious bonding phenomenon; 2) In the cleaning process after pickling in the subsequent pickling section, the structure of the existing cleaning equipment is mostly fixed, and it is difficult to adjust according to different specifications of stainless steel plates, which consumes more water. Resources; 3) At the same time, there is a common problem in the rolling process. The surface of stainless steel is easy to wrinkle. The more generally accepted view is that stainless steel produces column crystallization of composition segregation when the steel solidifies, which is caused by the inhomogeneity of the composition

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