Control method for hot rolled SPA-H strip steel surface spot-like peeling defects

A control method and surface point technology, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve problems affecting the temperature of the slab, shallow cracks on the surface of the slab, and aggravate Cu enrichment, etc., to achieve improved The effect of surface quality, good economic benefits and social benefits
CN110306115AInactive Publication Date: 2019-10-08INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Publication Date
2019-10-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a control method for hot rolled SPA-H strip steel surface spot-like peeling defects. The control method sequentially comprises the following steps of S1, molten iron KR desulfurization; S2, converter smelting; S3, LF refining, and controlling the mass percentages of chemical components in molten steel at the end of LF refining; S4, slab continuous casting and controlling the superheat degree of molten steel in a tundish to be 20-30 DEG C with the continuous casting and drawing speed of 1.0-1.2m / min; S5, heating in a heating furnace and placing a continuous casting slabin a heating furnace for heating treatment with the steel loading temperature of the heating furnace not higher than 600 DEG C; S6, primary descaling; S7, roughing; S8, secondary descaling; S9, finishrolling; S10, laminar cooling; and S11, coiling. The control method has the advantages that under the condition of not improving existing equipment and not changing the production flow, the problem of spot-like peeling defects on the surface of hot rolled SPA-H strip steel is effectively solved by using the existing equipment, and the yield is improved.
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Description

technical field

[0001] The application belongs to the technical field of material processing engineering, and in particular relates to a control method for point-shaped warping defects on the surface of hot-rolled SPA-H strip steel. Background technique

[0002] SPA-H strip steel is a weather-resistant steel with a mass fraction of Cu of 0.25-0.60%. It is mainly used to make containers. Therefore, it has high requirements on the surface quality of the strip steel. Surface quality is an important aspect that affects the quality of hot-rolled strip steel products. Now Low-Ni (Ni content mass percentage 0.01-0.04%) SPA-H strip steel produced by state-of-the-art technology is prone to "point-like warping" defects, such as figure 1 As shown, it not only caused an increase in the number of judgments, but also affected the normal production of the hot rolling mill. No such defects were found in other steel types such as Q235B, SPHC and other steels during the rolling period. The ...

Claims

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