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Control method for pressing-in of oxide scale on surface of hot-rolled silicon-controlled strip steel

A control method and surface oxidation technology, applied in metal rolling and other directions, can solve problems such as limited popularization, and achieve the effects of wide application, reducing the probability of occurrence of defective coils, and improving the yield of strip steel.

Pending Publication Date: 2022-01-04
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scope of most studies or applications is often limited to a certain series, such as for cold-rolled base material (SPHC) or for hot-rolled pickled plates, etc., and none of the low-silicon series steels are easy to produce scale. Propose a systematic control method, limited in generalization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Utilize the method involved in the present invention and the control measure to carry out the rolling of SPHC steel on the 1580mm hot rolling production line, the rolling specification is 3.0mm*1120mm, 3.5mm*1130mm two kinds of specifications, enter furnace temperature 310 ℃, add up to 123 roll. The relevant control process parameters are:

[0019] Control the temperature range of the three-add furnace to 1220°C, the temperature range of the soaking furnace to 1210°C, and control the temperature difference between the three-add furnace and the soaking furnace at 10°C;

[0020] The time in the furnace is 140min;

[0021] The descaling temperature after the furnace and the rough rolling and finishing rolling temperature are controlled at 1005°C;

[0022] The temperature at the entrance of finish rolling is controlled at 980°C;

[0023] In the finishing rolling process, the cooling water between the F1 and F2 stands is added, and the reduction rate of F1 is 50%;

[002...

Embodiment 2

[0026] Using the method and control measures involved in the present invention, the rolling of SPHT steel was carried out on a 1580mm hot rolling production line, the rolling specifications were 3.05 / 3.15 / 3.25 / 3.9mm*1219mm, four specifications, and the furnace temperature was 180°C , a total of 78 volumes. The relevant control process parameters are:

[0027] Control the temperature range of the three-add furnace to 1250°C, the temperature range of the soaking furnace to 1230°C, and control the temperature difference between the three-add furnace and the soaking furnace at 20°C;

[0028] The time in the furnace is 180min;

[0029] The descaling temperature after the furnace and the rough rolling and finishing rolling temperature are controlled at 997°C;

[0030] The temperature at the entrance of finish rolling is controlled at 978°C;

[0031] In the finishing rolling process, the cooling water between the F1 and F2 stands is added, and the reduction rate of F1 is 50%.

[...

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Abstract

The invention relates to the technical field of steel rolling, in particular to a control method for pressing-in of oxide scale on the surface of hot-rolled silicon-controlled strip steel. The control method comprises the procedures of steelmaking, continuous casting, slab heating, primary descaling, rough rolling, secondary descaling, finish rolling, laminar cooling and coiling. According to the control method, starting with the mechanism that the oxide scale is likely to be generated on the silicon-controlled hot-rolled strip steel, effective control means are adopted for key points of procedures of heating, rough rolling and finish rolling of a plate blank, and the applicability is wide; and on the premise that the existing technological process is not changed and the production cost is not increased, the occurrence probability of silicon-controlled hot-rolled strip steel oxide scale defect coils is effectively reduced, and the strip steel yield is improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling the pressing of oxide scales on the surface of a hot-rolled silicon-controlled strip steel. Background technique [0002] Hot-rolled strip steel has a wide range of uses and occupies an extremely important position in the entire steel industry. In the process of developing steel grades, iron and steel enterprises will carry out targeted composition design according to the purposes of downstream customers. For some varieties that require high ductility, such as cold-rolled base materials, some pickled plates, and foreign trade materials (SPHT), the Si content is often controlled below 0.03%. Si element will form a layer of SiO on the strip surface at high temperature. 2 The thin film can effectively prevent further oxidation of the strip steel and improve the oxidation resistance of the strip steel. Therefore, for the silicon-controlled steel serie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26
CPCB21B1/26
Inventor 张盛攀焦安杰刘小凯郭万胜刘家顺陈海杰
Owner RIZHAO STEEL HLDG GROUP
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