A kind of 430 stainless steel and rolling method thereof

Abstract

The invention discloses a rolling method of 430 stainless steel. The weight percentage of the chemical composition is: C≤0.04%, 0.30%≤Si≤0.60%, Mn≤0.45%, P≤0.030%, S≤0.005%, Cr≤16.50% , N ≤ 0.045%, 0.05% ≤ Re ≤ 0.25%; the rest are Fe elements and other unavoidable impurities; the specific steps of the rolling method are as follows: 1) heating: the heating steps are successively divided into a preheating section, a heating section, Heating stage 2, soaking stage; 2) Rough rolling: The billet enters the rough rolling mechanism through the heat preservation transmission mechanism, and the rough rolling mechanism performs rough rolling on the heated billet for the first time; 3) Finish rolling: After rough rolling, the billet enters the finish rolling mechanism for finishing. 4) coiling; 5) uncoiling welding; 6) annealing; 7) phosphorus breaking shot blasting; 8) pickling; 9) cleaning: cleaning the surface of the pickled stainless steel plate by cleaning device; 10) drying Dry. The invention obtains high-quality stainless steel plates through reasonable raw material ratio and rolling process, and ensures the surface quality of the stainless steel plates.

Description

technical field [0001] The invention belongs to the technical field of stainless steel rolling, in particular to a 430 stainless steel rolling method. 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 pressure, which results in a...

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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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