Plate shape control method for high-carbon steel in thin slab continuous casting and rolling production

A thin slab continuous casting and shape control technology, applied in rolling mill control devices, metal rolling, metal rolling, etc. The effect of the good rate of plate shape and the improvement of customer satisfaction

Active Publication Date: 2021-11-02
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of medium and high carbon steel, even if the above-mentioned shape control ideas and corresponding control points are adopted, the shape of the steel coil is still poor due to bright bands or ribs, and the rate of straight coil shape failure is over 30%. , the control effect is not good, so it is urgent to study and formulate a flatness control method that meets the characteristics of the thin slab continuous casting and rolling production line and the process requirements of medium and high carbon steel

Method used

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Embodiment Construction

[0014] The present invention will be further described below in combination with specific embodiments.

[0015] The invention provides a strip shape control method for producing medium and high carbon steel by continuous casting and rolling of thin slabs.

[0016] The specific production steps include:

[0017] (1) Steelmaking process.

[0018] The raw materials are sequentially smelted in a decarburization furnace and a refining furnace, and the composition of the tapped steel meets the standard requirements.

[0019] (2) Continuous casting process.

[0020] Qualified molten steel is cast into continuous slabs. The thickness of the slab is 90mm-110mm, the casting speed is controlled in the range of 4.0m / min-4.8m / min in the continuous casting stage, and the temperature difference of the slab section is controlled within 70°C.

[0021] The reason why the present invention controls the casting speed in the continuous casting stage to 4.0m / min-4.8m / min is because the continuo...

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Abstract

The invention discloses a plate shape control method for high-carbon steel in thin slab continuous casting and rolling production, and belongs to the field of steel production. The method comprises the following steps of a steelmaking process, a cast rolling process and a slow cooling process, the cast rolling process comprises continuous casting, rough rolling, induction heating, finish rolling, layer cooling and coiling; during continuous casting, the thickness of a casting blank is 90-110 mm, the pulling speed is controlled within the range of 4.0-4.8 m/min, and the temperature difference of the section of the casting blank is controlled within 70 DEG C; in the finish rolling procedure, an F3 working roller is a high-speed steel roller, and an F4 working roller and an F5 working roller are high-nickel-chromium rollers; the convexity of the F3 working roller is set to be 200 microns larger than that of other produced steel types, and the load distribution of each rack adopts the principle of sequentially decreasing. Compared with the prior art, the good rate of the straight hair curled plate shape is improved.

Description

technical field [0001] The invention relates to a steel production method, in particular to a strip shape control method for thin slab continuous casting and rolling production of medium and high carbon steel. Background technique [0002] Thin slab continuous casting and rolling medium-high carbon steel has the advantages of high dimensional accuracy, no segregation in structure, uniform composition, thin limit specifications, and can save annealing and cold rolling costs. Downstream customers are mainly cold rolling industry, the main processing process is pickling (or slitting → pickling) → cold rolling → annealing → cold rolling → slitting, the products are widely used in saw blades, tape measures, logistics tensioners, ticket Folder and other hardware industries. After investigation, customers are generally recognized and satisfied with the advantages of thin slab continuous casting and rolling medium-high carbon steel thin-gauge products and the dimensional accuracy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/24B21B45/02B21B37/00
CPCB21B1/24B21B45/0218B21B37/00Y02P10/25
Inventor 尚天傲李晓冬郭敏陈兵马宁王中辉常智乾季伟斌尹逊民李文泽
Owner RIZHAO STEEL HLDG GROUP
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