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A method for improving the quality of the bottom layer of grain-oriented silicon steel

A technology of grain-oriented silicon steel and quality, applied in the field of improving the quality of the bottom layer of grain-oriented silicon steel, can solve the problems of unstable quality of grain-oriented silicon steel bottom layer, etc., and achieve the effect of perfect secondary recrystallization, improve the quality of bottom layer, and promote oxidation.

Active Publication Date: 2017-05-10
GUANGDONG YINGQUAN HIGH TECH MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the instability or poor quality of the bottom layer of oriented silicon steel, and provide a method for improving the quality of the bottom layer of oriented silicon steel magnesium silicate, which can improve product performance

Method used

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  • A method for improving the quality of the bottom layer of grain-oriented silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. In the chemical composition of the billet, the contents (percentage by weight) of the chemical elements that affect the quality of the bottom layer are: Als: 0.019%, Als / N=2.0; Sn: 0.055%; Sb: 0.02%; Cr: 0.02%; V: 0.002%; Cu: 0.51%.

[0030] 2. After steelmaking, continuous casting slab, hot rolling and other processes, the steel plate is pickled in hydrochloric acid, and then the steel plate is brushed with a wire brush roller with a diameter of 300mm, a diameter of brush wire of 0.5mm, and a speed of 1000rpm. The surface is polished to completely remove the internal oxide layer on the surface of the steel plate.

[0031] 3. The steel plate is subjected to continuous decarburization annealing after the first cold rolling, and continuous recovery annealing after the second cold rolling. Before the continuous annealing, the steel plate is degreased and cleaned with ultrasonic waves. The ultrasonic cleaning solution is 1.5% sodium hydroxide solution, and Add 0.5% sodi...

Embodiment 2

[0036] 1. In the chemical composition of the billet, the contents (percentage by weight) of the chemical elements that affect the quality of the bottom layer are: Als: 0.018%, Als / N=2.0; Sn: 0.055%; Sb: 0.02%; Cr: 0.02%; V: 0.002%; Cu: 0.51%.

[0037] 2. After steelmaking, continuous casting slab, hot rolling and other processes, the steel plate is pickled in hydrochloric acid, and then the steel plate is brushed with a wire brush roller with a diameter of 300mm, a diameter of brush wire of 0.5mm, and a speed of 1000rpm. The surface is polished to completely remove the internal oxide layer on the surface of the steel plate.

[0038] 3. The steel plate is subjected to continuous decarburization annealing after the first cold rolling, and continuous recovery annealing after the second cold rolling. Before the continuous annealing, the steel plate is degreased and cleaned with ultrasonic waves. The ultrasonic cleaning solution is 1.5% sodium hydroxide solution, and Add 1.5% sodi...

Embodiment 3

[0043] 1. In the chemical composition of the billet, the contents (percentage by weight) of the chemical elements that affect the quality of the bottom layer are: Als: 0.018%, Als / N = 2.1; Sn: 0.03%; Sb: 0.03%; Cr: 0.01%; V: 0.002%; Cu: 0.58%.

[0044] 2. After steelmaking, continuous casting slab, hot rolling and other processes, the steel plate is pickled in hydrochloric acid, and then the steel plate is brushed with a wire brush roller with a diameter of 250mm, a brush wire diameter of 0.8mm, and a speed of 1000rpm. The surface is polished to completely remove the internal oxide layer on the surface of the steel plate.

[0045] 3. The steel plate is subjected to continuous decarburization annealing after the first cold rolling, and continuous recovery annealing after the second cold rolling. Before continuous annealing, the steel plate is degreased and cleaned with ultrasonic waves. The ultrasonic cleaning solution is 3% sodium hydroxide solution, and Add 2% sodium silicat...

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Abstract

The invention discloses a method for improving quality of a bottom layer of oriented silicon steel. The method comprises the following steps: (1) regulating chemical components of steel billet; (2) grinding the surface of a steel plate by use of a metal brush roller after pickling the steel plate; (3) using ultrasonic waves to clean the steel plate before continuous annealing; and flushing the steel plate with clear water after cleaning; (4) regulating conditions for recovery annealing; (5) adding titanium dioxide and magnesium carbonate into an isolating coating which takes magnesium oxide as a main component; and (6) regulating conditions for high-temperature annealing of a steel coil. The method disclosed by the invention can solve the problem that the bottom layer of the current oriented silicon steel is poor in quality or is unstable in quality, and has a very good industrial application prospect.

Description

technical field [0001] The invention relates to the field of oriented silicon steel production, in particular to a method for improving the quality of the bottom layer of oriented silicon steel. [0002] technical background [0003] In the production process of oriented silicon steel, after steelmaking, continuous casting slab, hot rolling, pickling, cold rolling, continuous annealing (decarburization annealing, recovery annealing, etc.) The secondary recrystallization process is completed under the action of the steel, and finally the steel is purified in the high heat preservation stage to obtain good magnetic properties. Before high-temperature annealing, it is necessary to coat the surface of the steel strip with an isolation coating mainly composed of magnesium oxide (MgO). The isolation coating can not only prevent the steel strip from bonding during high-temperature annealing, but more importantly, in the second heating stage of high-temperature annealing, when the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/52C21D1/74C22C38/60
CPCC21D1/74C21D9/52C22C38/60
Inventor 彭志华李晓强梁康宁钟洁容陈丽儿郑潮英罗开东梁建强
Owner GUANGDONG YINGQUAN HIGH TECH MATERIALS CO LTD
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