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A method for improving the magnetic properties of non-oriented silicon steel

A technology of oriented silicon steel and magnetic properties, applied in the field of non-oriented electrical steel manufacturing, can solve the problems of poor magnetic properties, grain growth of finished plates, low secondary reduction rate, etc., and achieves reduction of unfavorable texture components and magnetic induction The effect of increasing, grain size increasing

Active Publication Date: 2020-07-10
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0006] Chinese Patent No. CN2009 10083999.X, which discloses a high magnetic induction low iron loss cold-rolled non-oriented silicon steel for high-efficiency motors and its manufacturing method; its composition characteristics are (Si+Al)=1.1-1.3%, Mn 0.5-0.6 % and Cu 0.1~0.4%, its magnetic induction intensity B 50 >1.7T, iron loss P 1.5 / 50 <4.0W / kg; due to the low total amount of (Si+Al), the magnetic properties are poor; the addition of 0.5-0.6% manganese increases the difficulty of hot rolling; the addition of 0.1-0.4% copper will also inhibit Finished board grain growth
[0007] Pohang patent 200580044009 discloses a technology for manufacturing electrical steel sheets with excellent properties by controlling the hot-rolled texture through the phase transformation of steel; its composition characteristics are: Si 1.0-3.0%, Al 0.1-1.5%, Mn 0.1- 2.0%, where Mn and Al meet: -0.21.5 / 50 2.8 ~ 3.2W / kg, but the magnetic performance B 50 1.73~1.75T, low iron loss and low magnetic induction

Method used

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  • A method for improving the magnetic properties of non-oriented silicon steel
  • A method for improving the magnetic properties of non-oriented silicon steel
  • A method for improving the magnetic properties of non-oriented silicon steel

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Experimental program
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Effect test

Embodiment 1

[0033] Process such as figure 1 shown;

[0034] The molten steel is smelted according to the set chemical composition, and its composition contains Si 0.45%, Al 0.19%, Mn0.31%, P0.142%, S 0.0021%, N 0.0019%, C 0.0023%, Sb 0.12% by mass percentage, and the rest is Fe and unavoidable impurities; the molten steel of the above composition is made into a continuous casting slab through a continuous casting machine, with a thickness of 210mm;

[0035] The continuous casting slab was heated to 1100°C and held for 2 hours, and then hot rolled, Ar 1=872°C+1000(11*[Si]-14*[Mn]+21*[Al]+24*[P])=952.1°C; control finish rolling temperature T=(Ar 1 -120)~(Ar 1 -70)°C=832.1~882.1°C, the actual final rolling temperature T is 860°C; coiling after hot rolling is completed, the coiling temperature is 650°C, air-cooled to room temperature after coiling, and a hot-rolled coil with a thickness of 2.6mm is obtained ;

[0036] The volume fraction of the unrecrystallized structure of the hot-rolle...

Embodiment 2

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

[0042] (1) The composition of molten steel contains Si 0.35%, Al 0.31%, Mn 0.10%, P 0.107%, S0.0015%, N 0.0015%, C 0.0015%, Sn 0.08% by mass percentage; the thickness of the continuous casting slab is 230mm;

[0043] (2) The continuous casting slab is heated to 1200°C and held for 1h before hot rolling, Ar 1 =872°C+1000(11*[Si]-14*[Mn]+21*[Al]+24*[P])=987.3°C, T=(Ar 1 -120)~(Ar 1 -70)°C=867.3~917.3°C, the actual final rolling temperature is 890°C; the coiling temperature is 630°C, and a hot-rolled coil with a thickness of 2.8mm is obtained;

[0044] (3) The volume fraction of the unrecrystallized structure of the hot-rolled coil is 10.8%;

[0045] (4) The normalization treatment temperature is 870 °C for 5 minutes; the average grain size of the normalization plate is 188 μm, and its metallographic structure is as follows figure 2 As shown, the texture The ODF cross-sectional view is as follows image 3 As shown, ...

Embodiment 3

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The composition of molten steel contains Si 0.61%, Al 0.25%, Mn 0.26%, P 0.102%, S0.0016%, N 0.0014%, C 0.0036%, Sn 0.11% by mass percentage; the thickness of the continuous casting slab is 220mm;

[0050] (2) The continuous casting slab is heated to 1100°C and held for 1.5h before hot rolling, Ar 1 =872°C+1000(11*[Si]-14*[Mn]+21*[Al]+24*[P])=979.7°C, T=(Ar 1 -120)~(Ar 1 -70)°C=859.7~909.7°C, the actual final rolling temperature is 870°C, the coiling temperature is 600°C, and a hot-rolled coil with a thickness of 2.5mm is obtained;

[0051] (3) The volume fraction of the unrecrystallized structure of the hot-rolled coil is 24.7%;

[0052] (4) The normalization treatment temperature is 860°C for 5 minutes; the average grain size of the normalization plate is 145 μm;

[0053] (5) H in protective atmosphere 2 The volume percentage is 70%; the annealing temperature is 860°C, and the time is 5min; the B of non...

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Abstract

A method for improving the magnetic properties of non-oriented silicon steel, including the following steps: (1) smelting molten steel, the composition of which contains Si 0.1~1.2%, Al 0.1~0.5%, Mn 0.05~0.4%, P≤0.2%, S≤0.003 %, N≤0.005%, C≤0.005%, Sb 0~0.2%, Sn 0~0.2%, the rest is Fe; molten steel is continuously cast into continuous casting billet; (2) Heated to 1100~1200℃ and kept for 1~ After 2 hours hot rolling, control the final rolling temperature (Ar 1 -120)~(Ar 1 -70)℃; coiling after hot rolling; (3) normalization treatment after uncoiling; (4) cold rolling after pickling; (5) annealing treatment under protective atmosphere conditions, and cooling to 400~500℃ with the furnace Then air cool to room temperature and coat with insulation film. In the present invention, the grain size reaches 120-200 μm before cold rolling. After cold rolling and annealing, the beneficial texture is improved and the unfavorable texture components are significantly reduced, thereby reducing the iron loss and significantly increasing the magnetic induction intensity.

Description

technical field [0001] The invention belongs to the technical field of non-oriented electrical steel manufacturing, and in particular relates to a method for improving the magnetic properties of non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel is mainly used to make the iron core material of the motor, and is a product aimed at controlling the magnetic properties. With the development of home appliances towards miniaturization, high precision, and high efficiency, the requirements for the magnetic properties of non-oriented silicon steel are also getting higher and higher. Improving the magnetism of non-oriented silicon steel can not only effectively improve the efficiency of the motor, but also reduce energy consumption and protect the environment. Since there are many manufacturers of non-oriented silicon steel and the market competition is fierce, it is urgent to realize high magnetic induction. Therefore, research and development of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D1/74C21D8/12C22C38/02C22C38/04C22C38/06C22C38/60
CPCC21D1/26C21D1/74C21D8/1222C21D8/1233C21D8/1272C22C38/001C22C38/002C22C38/004C22C38/008C22C38/02C22C38/04C22C38/06C22C38/60
Inventor 刘海涛陈冬梅王超刘光军安珍珍王国栋
Owner NORTHEASTERN UNIV LIAONING