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Method for improving magnetic performance of low-silicon 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 decreasing magnetic induction intensity and increasing iron loss of products, and achieve the effects of reducing unfavorable texture strength, improving magnetic properties and long holding time

Active Publication Date: 2019-01-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of studies have found that iron loss and magnetic induction are usually a pair of contradictory performance indicators. The means of reducing iron loss often leads to a decrease in the magnetic induction of the product. The method of increasing the magnetic induction usually also leads to an increase in iron loss, while improving the magnetic induction and Reducing iron loss is an important research direction for this type of product

Method used

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  • Method for improving magnetic performance of low-silicon non-oriented silicon steel
  • Method for improving magnetic performance of low-silicon non-oriented silicon steel
  • Method for improving magnetic performance of low-silicon non-oriented silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Process such as figure 1 shown;

[0030] The molten steel is smelted according to the set chemical composition, and its composition contains Si 0.36%, Al 0.41%, Mn0.15%, P 0.103%, S 0.0015%, N 0.0019%, C 0.0015%, Sb 0.08%, 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 200mm;

[0031] The continuous casting slab was heated to 1100°C and held for 2 hours, and then hot-rolled for 7 passes; after hot-rolling, it was coiled, and Ar 1 The calculation formula is: Ar 1 =872°C+1000(11*[Si]-14*[Mn]+21*[Al])=976.7°C, control the finish rolling temperature T=(Ar 1 -110)~(Ar 1 -50)°C=866.7~926.7°C; the actual final rolling temperature is 890°C; the coiling temperature is 570°C, air-cooled to room temperature after coiling to obtain a hot-rolled coil with a thickness of 2.6mm; the unrecrystallized grains of the hot-rolled coil The volume fra...

Embodiment 2

[0037] Method is with embodiment 1, and difference is:

[0038] (1) The composition of molten steel contains Si 0.49%, Al 0.58%, Mn 0.26%, P 0.108%, S0.0014%, N 0.0025%, C 0.0024%, Sn 0.07% by mass percentage; the thickness of the continuous casting slab is 240mm;

[0039](2) Heating the continuous casting slab to 1100°C and keeping it warm for 1.5h and then hot rolling; Ar 1 The calculation formula is: Ar 1 =872°C+1000(11*[Si]-14*[Mn]+21*[Al])=1011.3°C, hot rolling finishing temperature T=(Ar 1 -110)~(Ar 1 -50)°C=901.3~961.3°C, the actual final rolling temperature is 935°C; the coiling temperature is 680°C, and a hot-rolled coil with a thickness of 2.8mm is obtained; the volume fraction of unrecrystallized grains in the hot-rolled coil accounts for 11.8%;

[0040] The temperature of the bell annealing treatment is 800°C, and the time is 2h;

[0041] The average grain size of the hot-rolled coil after bell annealing treatment is 155 μm;

[0042] (3) H in protective atmosp...

Embodiment 3

[0044] Method is with embodiment 1, and difference is:

[0045] (1) The composition of molten steel contains Si 0.73%, Al 0.41%, Mn 0.35%, P 0.12%, S0.0013%, N 0.0012%, C 0.0036%, Sn 0.08% by mass percentage; the thickness of the continuous casting slab is 210mm;

[0046] (2) Heating the continuous casting slab to 1200°C and holding it for 1h and then hot rolling; Ar 1 The calculation formula is: Ar 1 =872°C+1000(11*[Si]-14*[Mn]+21*[Al])=989.4°C, hot rolling finishing temperature T=(Ar 1 -110)~(Ar 1 -50)°C=879.4~939.4°C, the actual final rolling temperature is 900°C; the coiling temperature is 600°C, and a hot-rolled coil with a thickness of 2.5mm is obtained; the volume fraction of unrecrystallized grains in the hot-rolled coil accounts for 23.7%;

[0047] The temperature of the bell annealing treatment is 820°C, and the time is 1h;

[0048] The average grain size of the hot-rolled coil after bell annealing treatment is 131 μm;

[0049] (3) H in protective atmosphere 2 ...

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Abstract

The invention relates to a method for improving magnetic performance of low-silicon non-oriented silicon steel. The method comprises the following steps: (1) smelting molten steel, and preparing a continuously-cast billet from the molten steel by a continuous caster, wherein the molten steel contains the ingredients: 0.3% to 1.5% of Si, 0.1% to 0.8% of Al, 0.1% to 0.5% of Mn, not higher than 0.15%of P, not higher than 0.003% of S, not higher than 0.003% of N, not higher than 0.005% of C, 0 to 0.2% of Sb, 0% to 0.2% of Sn and the balance of Fe; (2) heating the temperature of the continuously-cast billet to 1,100 DEG C to 1,200 DEG C, carrying out heat preservation for 1 to 2 hours, then, carrying out hot rolling, controlling an end rolling temperature to (Ar1-110) to (Ar1-50) DEG C, and carrying out coiling after hot rolling is completed; (3) carrying out hood type annealing treatment; (4) carrying out uncoiling, then, carrying out acid pickling, and carrying out cold rolling; (5) carrying out annealing treatment under protective atmosphere conditions, carrying out furnace cooling till the temperature of 400 DEG C to 500 DEG C, carrying out air cooling, and then, coating an insulating film. According to the method, the grain size reaches 120 to 180 microns before cold rolling, and the texture is improved obviously; after cold rolling and annealing, the reinforcement of the texture is facilitated, and the weakening of the strength of the texture is unfavorable, so that the iron loss of non-oriented silicon steel finished plates is lowered, and the magnetic induction is enhanced.

Description

technical field [0001] The invention belongs to the technical field of non-oriented electrical steel manufacturing, in particular to a method for improving the magnetic properties of low-silicon non-oriented silicon steel. Background technique [0002] At present, with the increasingly serious problem of environmental pollution, energy saving and consumption reduction has become a hot issue that our government and major enterprises attach great importance to. As an important soft magnetic material, non-oriented silicon steel is mainly used to manufacture iron cores of various motors, and its output accounts for 80-90% of my country's electrical steel output. Among them, low-silicon non-oriented silicon steel accounts for a large proportion of non-oriented silicon steel. Therefore, improving the magnetic properties of low-silicon non-oriented silicon steel can effectively improve motor efficiency, save energy and reduce consumption, and protect the environment. [0003] The...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/04C22C38/60C21D8/12
CPCC21D8/1222C21D8/1233C21D8/1244C21D8/1261C22C38/008C22C38/02C22C38/04C22C38/06C22C38/60
Inventor 刘海涛陈冬梅王超刘光军安珍珍王国栋
Owner NORTHEASTERN UNIV
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