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Method for improving the shape of non-oriented silicon steel sheet

A technology of steel plate shape and oriented silicon steel, which is applied in the field of improving hot-rolled steel plate shape, can solve the problems of insufficient improvement of steel plate shape and high temperature of strip steel, so as to improve rollability, uniform cooling, and increase yield Effect

Active Publication Date: 2019-09-06
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

After the above normalized cooling process, the temperature of the strip is usually high and the shape of the steel plate has not been sufficiently improved

Method used

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  • Method for improving the shape of non-oriented silicon steel sheet
  • Method for improving the shape of non-oriented silicon steel sheet
  • Method for improving the shape of non-oriented silicon steel sheet

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Embodiment 1-4

[0037] Continue to refer to Fig. 1, the method for improving the shape of non-oriented silicon steel sheet in embodiment 1-4 comprises carrying out normalized cooling step, cold rolling step and annealing coating step successively after making non-oriented silicon steel hot-rolled sheet, wherein, The normalizing cooling step comprises the following steps in turn (Table 1 shows the specific process parameters of the method for improving the shape of the non-oriented silicon steel sheet in the above-mentioned embodiments 1-4):

[0038] 1) Preheating: hot-rolled sheet is preheated from room temperature to 300-500°C;

[0039] 2) Non-oxidation heating: heat the hot-rolled sheet to 800-1000°C;

[0040] 3) Radiant tube heating and cooling: first heat the hot-rolled sheet to 900-1000°C by the radiant tube, and then cool it to 900-950°C by the radiant tube;

[0041] 4) Soaking by means of electricity or radiation: soaking temperature 850-900°C, cooling to 800-900°C;

[0042] 5) Rapid...

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Abstract

The invention discloses a method for improving the shape of a non-oriented silicon steel plate. After preparation of a non-oriented hot-rolled silicon steel plate, a normalized cooling step, a cold rolling step and an annealing coating step are successively carried out. In addition, the normalized cooling step successively comprises the following processes: preheating; non-oxidizing heating; radiant tube heating; radiant tube cooling; soaking; rapid water-cooling; slow water-cooling with the cooling speed being lower than the speed of the rapid water-cooling; and air cooling. By the above method for improving the shape of the non-oriented silicon steel plate, the shape of the hot-rolled steel plate can be improved effectively, microstructure of the hot-rolled steel plate is uniformized, magnetism of the steel plate is guaranteed, numerous shearing of the steel plate is avoided, and plate yield is increased advantageously.

Description

technical field [0001] The invention relates to a method for improving the shape of a metal plate, in particular to a method for improving the shape of a hot-rolled steel plate. Background technique [0002] The heat treatment and annealing process of hot-rolled plates usually uses a horizontal annealing furnace to complete the entire annealing process. The heat treatment annealing process is mainly used in the production process of grain-oriented silicon steel, high-grade non-oriented silicon steel and high-efficiency non-oriented electrical steel. Since users have high requirements on the shape quality of hot-rolled plate products, they are especially concerned about the edge shape of the strip. For this reason, the metallurgical industry attaches great importance to the shape of the hot-rolled plate after the heat treatment and annealing process. Since the current hot-rolled sheet in the heat treatment and annealing process usually adopts rapid cooling in the normalizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12
Inventor 赵彬张军韩卫国宿德军朱华群林润杰沈志萍唐伟王红兵
Owner BAOSHAN IRON & STEEL CO LTD
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