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A method for preparing non-oriented electrical steel with high magnetic induction and high strength by step-by-step regulation

A kind of oriented electrical steel, high-strength technology, applied in the field of electrical steel manufacturing, can solve the problems of difficulty in both, and achieve the effect of improving mechanical properties

Active Publication Date: 2022-08-02
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that existing high-strength non-oriented electrical steel is difficult to have both force and magnetic properties, the present invention provides a step-by-step control method for preparing high magnetic induction and high-strength non-oriented electrical steel. During the precipitation process of Cu-rich phase, the grain size and main texture of the material will not change significantly. By adjusting the heat treatment temperature before the aging treatment before hot rolling, and controlling the interval between the two hot rolling stages during the hot rolling process Time, to optimize the microstructure and texture of non-oriented electrical steel, and then medium-temperature aging treatment to precipitate nano-Cu-rich phases to improve mechanical properties, to manufacture high-magnetic-inductive, high-strength non-oriented electrical steel, to achieve sufficient performance indicators to meet driving / traction requirements Motor usage requirements

Method used

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  • A method for preparing non-oriented electrical steel with high magnetic induction and high strength by step-by-step regulation
  • A method for preparing non-oriented electrical steel with high magnetic induction and high strength by step-by-step regulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Process such as figure 1 shown;

[0042]The molten steel is smelted in a converter according to the set composition, and the harmful gases in the steel are removed by RH vacuum refining treatment, and then subjected to decarburization, dephosphorization and desulfurization, and finally continuous casting is carried out to form a continuous casting billet; 0.005%, Si3.4%, Cu1.1%, Ni 0.8%, Al 0.5%, Mn 0.8%, P 0.004%, S 0.003%, the rest are Fe and inevitable impurities;

[0043] The thickness of the continuous casting billet is 80mm;

[0044] The continuous casting billet is placed in a soaking furnace, kept at 1000 ° C for 90 minutes, and then multi-pass hot rolling is carried out. The rolling temperature is 720-1080 ° C, and the interval between two adjacent passes of hot rolling. is 90s; air-cooled to room temperature after hot rolling, and made into a hot-rolled sheet, the thickness of the hot-rolled sheet is 3mm; the total reduction rate is 96.25%;

[0045] The hot...

Embodiment 2

[0053] The method is the same as in Example 1, except that:

[0054] (1) The continuous casting billet contains C 0.006%, Si 1.52%, Cu 0.8%, Ni 0.6%, Al0.2%, Mn 1.0%, P 0.003%, S 0.002% by mass percentage; the thickness of the continuous casting billet is 150mm ;

[0055] (2) The soaking furnace is kept at 900°C for 120min, and the interval between two adjacent passes of hot rolling is 60s; the thickness of the hot-rolled sheet is 5mm; the total reduction rate of hot-rolling is 96.7%;

[0056] (3) Normalization treatment at 1050°C for 60min; the volume concentration of hydrogen in the mixed atmosphere is 30%;

[0057] (4) The total reduction ratio of cold rolling is 90%; the thickness of cold rolling sheet is 0.50mm;

[0058] (5) annealing at 1050°C for 5 minutes; the volume concentration of hydrogen in the mixed atmosphere is 30%;

[0059] (6) The annealed sheet is kept at 600°C for 15min for aging treatment;

[0060] The λ texture component ratio of high magnetic inducti...

Embodiment 3

[0064] The method is the same as in Example 1, except that:

[0065] (1) The continuous casting billet contains C 0.002%, Si 3.12%, Cu 1.32%, Ni 1.4%, Al0.3%, Mn 0.5%, P 0.002%, S 0.004% by mass percentage; the thickness of the continuous casting billet is 300mm ;

[0066] (2) The soaking furnace is kept at 1100°C for 60 minutes, and the interval between two adjacent passes of hot rolling is 45s; the thickness of the hot-rolled sheet is 3.6mm; the total hot-rolling reduction rate is 98.8%;

[0067] (3) Normalization treatment at 900°C for 120min; the volume concentration of hydrogen in the mixed atmosphere is 50%;

[0068] (4) The total reduction ratio of cold rolling is 73.3%; the thickness of cold rolling sheet is 0.10mm;

[0069] (5) annealing at 1030°C for 15min; the volume concentration of hydrogen in the mixed atmosphere is 50%;

[0070] (6) The annealed sheet is kept at 500°C for 25min for aging treatment;

[0071] The λ texture component ratio of high magnetic indu...

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Abstract

A method for preparing high-magnetic-induction and high-strength non-oriented electrical steel by step-by-step regulation and control is carried out according to the following steps: (1) using a converter to smelt molten steel according to the set composition to make a continuous casting billet, containing C 0.001-0.008%, Si 1.5 ~4.8%, Cu 0.5~2%, Ni 0.5~1.5%, Al 0.2~1%, Mn 0.2~1.5%, P<0.005%, S<0.005%, the rest is Fe; Heat preservation in a soaking furnace, and the interval between two adjacent passes of multi-pass hot rolling is 30-180s; air cooling; (3) normalization treatment; (4) multi-pass cold rolling; (5) annealing treatment; (6) Aging treatment. The method of the invention has low cost and simple process, and the produced non-oriented electrical steel has both excellent force and magnetic properties, and can well meet the use requirements of driving / traction motors.

Description

technical field [0001] The invention relates to the technical field of electrical steel manufacturing, in particular to a method for preparing high magnetic induction and high strength non-oriented electrical steel by step-by-step regulation. Background technique [0002] High-strength non-oriented electrical steel is a key material for driving / traction motors of new energy vehicles and high-speed trains. With the development of the industry, the demand for high-strength non-oriented electrical steel is increasing, and the strength of non-oriented electrical steel put forward higher requirements. [0003] The performance of non-oriented electrical steel directly affects the dynamic characteristics, service performance and energy consumption level of the drive / traction motor; therefore, it is very important for the development of the industry to manufacture high-strength non-oriented electrical steel with excellent magnetic properties. At present, a variety of methods for ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/16C22C38/08C22C38/06C22C38/04C21D8/12
CPCC22C38/004C22C38/02C22C38/16C22C38/08C22C38/06C22C38/04C21D8/1222C21D8/1233C21D8/1244
Inventor 祖国庆王宇帆鲍娜娜莫立庸韩英朱巍巍赵宇冉旭
Owner CHANGCHUN UNIV OF TECH
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