A method for quick change of different steel types in ordinary stainless steel continuous casting production

Abstract

The invention discloses a method for fast switching of different steel types in common stainless steel continuous casting production. The method comprises the steps that a tundish meeting the following two conditions simultaneously is selected, wherein the two conditions include a, the density of previous-contained molten steel is larger than the density of molten steel needing to be contained currently, and b, the temperature difference of the previous-contained molten steel and the molten steel needing to be contained currently is smaller than or equal to 10 DEG C; and in addition, whether the width of the lower end of a crystallizer needs to be adjusted online or not is determined according to the width of cold billets needing to be obtained of a previous steel type and a later steel type and the difference value of the shrinkage coefficient of a previous steel type billet and the shrinkage coefficient of a later steel type billet. By means of the method, the steel mixing phenomenon in the fast switching process of different steel types can be effectively relieved and even eliminated, and the continuous casting operation rate can be increased.

Description

technical field [0001] The invention relates to a method for quickly changing different steel types in the production of common stainless steel continuous casting. Background technique [0002] The continuous casting process refers to the process of casting molten steel through pouring, condensing and cutting to obtain slabs. The most important part of this process is to pour one or more furnaces of molten steel into the crystallizer continuously through the ladle and the tundish, and cool it with water in the crystallizer composed of four copper plates, so as to obtain a shell with a solid surrounding and a solid shell in the middle. A slab of molten steel. Then the casting slab is gradually solidified through secondary cooling, and is pulled out of the continuous casting machine body through the support and rotation of the rollers in the tension-leveling device, and then cut into slabs of a certain length by the cutting device. [0003] Among them, the cooling of the cry...

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Problems solved by technology

For the same steel type, there will be no problem of unqualified components of some slabs caused by mixing steel during quick change; but when the steel types are different, due to their density, composition, etc., it will cause different degrees of mixed steel, As a result, the composition of the slab does not match the target composition of the steel, which affects product performance

[0005] Common stainless steels such as 301, 304, 304L, 304J1, 316L, 316, 321 and other commonly used steels have high viscosity at high temperature, so the quick change operation is more difficult than ordinary carbon steel, and it is more likely that the composition of the billet does not match the target composition of the steel. question

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