S50C high-carbon steel and production method and application thereof

By optimizing the heating and rolling process of S50C high-carbon steel, the problems of increasing the thickness of the iron oxide sheet and difficulty in pickling caused by grain boundary oxidation are solved, and the surface quality and production efficiency are improved.

CN119979844APending Publication Date: 2025-05-13HUNAN VALIN LIANYUAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202510151056.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-11
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

S50C high-carbon steel is prone to grain boundary oxidation during heating and rolling, resulting in increased thickness of the iron oxide sheet, difficulty in pickling, and affecting surface quality and production efficiency.

Method used

By optimizing the heating and rolling process of high-pull thin slabs, including the inlet furnace temperature and heating rate in the homogenization step, the opening and rolling speed in the finishing rolling step, the coiling temperature in the coiling step, etc., the thickness of the oxide iron sheet is significantly reduced and the grain boundary oxidation of the strip surface layer is improved.

Benefits of technology

It has achieved significant reduction in the thickness of the iron oxide sheet, improved the grain boundary oxidation of the strip surface, improved the ease of pickling and surface quality, and improved production efficiency.

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Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a production method and application of S50C high-carbon steel. The production method comprises the following steps that a high-pulling-speed sheet billet is sheared through a pendulum shear and then directly enters a soaking pit furnace, descaling, finish rolling, laminar cooling, coiling and air cooling are conducted, and S50C high-carbon steel is obtained; in the soaking step, the charging temperature ranges from 850 DEG C to 950 DEG C, and the heating rate ranges from 3.5 DEG C / min to 10.0 DEG C / min; the furnace temperature of the soaking furnace is 1150-1200 DEG C, and the soaking time is 19-40 minutes; in the coiling step, the coiling temperature is 570 DEG C to 620 DEG C. According to the production method of the S50C high-carbon steel, under the combination of the heating temperature, the heating time, the initial rolling temperature of finish rolling, the outlet temperature of finish rolling, the rolling speed of finish rolling and the coiling temperature, the thickness of oxide scale can be remarkably reduced, and strip steel surface layer grain boundary oxidation is improved; and the pickling surface quality and efficiency are improved.
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