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A Method for Optimizing the Shape of Non-Oriented High Silicon Steel Cold Rolled Sheet

A high-silicon steel and cold-rolled sheet technology is applied in the field of optimizing the shape of non-oriented high-silicon cold-rolled steel sheets to prevent internal stress, improve room temperature toughness, and optimize the shape of the sheet.

Active Publication Date: 2017-10-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high hardness of the warm-rolled sheet, there is a small amount of edge cracking in the 6.5wt.%Si silicon steel cold-rolled sheet prepared by the above method

Method used

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  • A Method for Optimizing the Shape of Non-Oriented High Silicon Steel Cold Rolled Sheet
  • A Method for Optimizing the Shape of Non-Oriented High Silicon Steel Cold Rolled Sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Melt steel is smelted, and then thin strip casting and rolling machine is used to prepare silicon steel casting strip, the thickness is 2.5mm, and the chemical composition contains C 0.0083%, Si 6.55%, N 0.0022%, O 0.0027%, S 0.0076% by weight percentage, and the balance is Fe; The silicon steel cast strip is hot-rolled to obtain a hot-rolled steel plate; the hot-rolling temperature is 900°C, and the total reduction is 40%;

[0029] The hot-rolled steel plate is warm-rolled at 100°C, and the total reduction of warm rolling is 60%, to obtain a warm-rolled steel plate; the metallographic structure is as follows: figure 1 as shown in (a);

[0030] The warm-rolled steel plate was kept at 350°C and a protective atmosphere for 30 minutes for low-temperature recovery, then air-cooled to room temperature, and the protective atmosphere was nitrogen; the metallographic structure is as follows: figure 1 as shown in (b);

[0031] Carry out cold rolling again, the total reduction ...

Embodiment 2

[0034] Method is with embodiment 1, and difference is:

[0035] (1) The thickness of the silicon steel cast strip is 2.4mm, and the composition contains C 0.008, Si 6.50%, N 0.0025%, O0.0024%, S 0.0075% by weight percentage; the hot rolling temperature is 1000°C, and the total reduction is 60% ;

[0036] (2) Warm rolling is carried out at 150°C, and the total reduction of warm rolling is 55%;

[0037] (3) Keep warm for 40 minutes at 340°C and protective atmosphere;

[0038] (4) The total reduction of cold rolling is 40%;

[0039] Non-oriented high-silicon steel cold-rolled sheets have slight edge cracks and good shape.

Embodiment 3

[0041] Method is with embodiment 1, and difference is:

[0042] (1) The thickness of the silicon steel cast strip is 2.3mm, and the composition contains 0.009% of C, 6.45% of Si, 0.0026% of N, 0.0028% of O, and 0.0071% of S by weight percentage; the hot rolling temperature is 1050°C, and the total reduction is 56% ;

[0043] (2) Warm rolling is carried out at 200°C, and the total reduction of warm rolling is 58%;

[0044] (3) Keep warm for 50 minutes at 320°C and protective atmosphere;

[0045] (4) The total reduction of cold rolling is 30%;

[0046] Non-oriented high-silicon steel cold-rolled sheets have slight edge cracks and good shape.

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Abstract

A method for optimizing the shape of non-oriented high-silicon steel cold-rolled plates is carried out according to the following steps: (1) smelting molten steel, using a thin strip casting and rolling mill to prepare silicon steel cast strips, and hot-rolling to obtain hot-rolled steel plates; (2) at 100~300 Warm rolling is carried out at ℃, and the total reduction of warm rolling is controlled between 55~60%; (3) The warm-rolled steel plate is kept at 300~350°C and a protective atmosphere for 30~60 minutes, perform low temperature recovery, and then air-cooled to room temperature, and then cold rolling. The non-oriented high-silicon steel cold-rolled plate prepared by the invention has minimal edge cracks, good plate shape, low equipment requirements, and does not require cumbersome operations.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for optimizing the shape of a non-oriented high-silicon steel cold-rolled plate. Background technique [0002] Non-oriented silicon steel is an important soft magnetic material, and is the core material for making electrical components such as motors and generators. When the silicon content in non-oriented silicon steel increases to about 6.5wt.%, its soft magnetic properties will be greatly improved, which is manifested as high resistance, high magnetic permeability, high magnetization, and close to zero at high frequencies. Magnetostriction, very low eddy current and hysteresis loss, etc.; therefore, it is an ideal magnetic material in the manufacture of high-frequency and low-noise motors and transformers; however, due to the high Si content, its interior will Appears ordered phase B2 (FeSi) and DO 3 (Fe 3 Si), and due to the presence of Fe-Si covalent bonds, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C21D8/12
CPCC21D8/1211C21D8/1222C21D8/1227C21D8/1233C21D8/1244C22C38/004C22C38/02
Inventor 刘振宇王项龙李昊泽李成刚曹光明王国栋
Owner NORTHEASTERN UNIV LIAONING
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