Method for producing oriented electrical steel with excellent surface quality

A technology of oriented electrical steel and production method, applied in the field of oriented electrical steel, can solve the problems of increased production difficulty, large edge cracks, and inconvenient production

Inactive Publication Date: 2011-05-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high heating temperature, the following problems are brought about: (1) The surface layer of the slab melts into slag, which leads to an increase in manpower for the maintenance of the heating furnace; (2) Coarse grains are formed during the heating process, and the part with coarse grains cannot be secondary Recrystallization, resulting in linear crystals; (3) It is difficult to ensure that the slab is at an ideal temperature during the hot rolling process, which is easy to produce uneven inhibitors, which eventually leads to poor quality of secondary recrystallization; (4) due to the hot rolling process Large center edge cracks, low yield
The disadvantage of this method is that the oxid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The slab is shown in Table 1, and the balance is iron and unavoidable impurities. The slab was heated in a heating furnace at 1150°C for 3 hours, and then hot-rolled to 2.3mm. The hot-rolled sheet is heated to 1100°C in nitrogen, held for 2 minutes, then cooled to 900°C, held for 2 minutes, quickly quenched into boiling water, cooled at a cooling rate of 150°C / s or more; then pickled; cold rolled to 0.28 mm, with 2 times of aging treatment at 250°C for 10 minutes in the middle; then divide the sample into two parts A and B: the sample of part A is heated to 830°C, and the volume ratio is 75%H 2 , 25%N 2 , In the nitrogen-hydrogen mixed gas with a dew point of 60°C, keep it warm for 2 minutes, and remove the carbon in the steel to below 0.003wt%; then, at 750°C, keep the nitrogen-hydrogen mixed gas containing 3% ammonia by volume for 30 seconds, and put the steel The nitrogen in it was increased to 0.023wt%. The sample of part B is heated to 750°C, and kept in nitroge...

Embodiment 2

[0039] The components of slab C and D are shown in Table 3, and the balance is iron and unavoidable impurities. Slab C was heated in a heating furnace at 1250°C for 2.5 hours, and slab D was heated in a heating furnace at 1150°C for 3 hours; rolled to 2.3mm; The hot-rolled sheet is heated to 1050°C in nitrogen, held for 2 minutes, then cooled to 900°C, held for 2 minutes, quickly quenched into boiling water; then pickled, cold-rolled to 0.22mm, and carried out twice at 250°C for 10 minutes Minute aging treatment; heat up to 750°C, hold for 30 seconds in a nitrogen-hydrogen mixture containing 3% ammonia by volume, and increase the nitrogen in the steel to 0.025wt%; then at 830°C, the dew point is 60°C, and the volume ratio is 75%H 2 , 25%N 2 In the mixed gas, keep it warm for 2 minutes to remove carbon to less than 0.003wt%; apply MgO; in the nitrogen-hydrogen mixed atmosphere, raise it to 1200°C at 15°C / hour, change the atmosphere to pure hydrogen, keep it warm for 20 hours, ...

Embodiment 3

[0046] The composition of the steel is shown in Table 5, and the balance is iron and unavoidable impurities. The billet is heated in a heating furnace at 1150°C for 3 hours; hot-rolled to 2.3mm; the hot-rolled plate is heated to 1050°C in nitrogen, kept for 2 minutes, then cooled to 900°C, kept for 2 minutes, and quickly quenched into boiling water; Washing; cold rolling to 0.22mm, and 2 times of aging treatment at 250°C for 10 minutes in the middle; then divide the sample into two parts E, F, and G: the sample of part E is heated to 700°C, and the sample contains 3% volume The nitrogen-hydrogen mixed gas of ammonia is kept for 30 seconds to increase the nitrogen in the steel to 0.022wt%; then at 830°C, the dew point is 60°C, and the volume ratio is 75%H 2 , 25%N 2 In the mixed gas of mixed gas, keep warm for 2 minutes to remove the carbon to below 0.003%; the sample of part F is heated to 860°C, and kept in the mixed gas of nitrogen and hydrogen containing 3% ammonia by volu...

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PUM

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Abstract

The invention discloses a method for producing oriented electrical steel with excellent surface quality, and belongs to the technical field of oriented electrical steel production. The method comprises the following processes of: heating a casting blank at the temperature of between 1,000 and 1,190 DEG C, and then performing hot rolling; normalizing the hot rolled plate at the temperature of between 980 and 1,100 DEG C, and washing the plate by using acid; cold-rolling the plate to the thickness of a finished product under high rolling reduction rate of 86 to 93 percent; heating the cold rolled steel plate to the temperature of between 750 and 860 DEG C, and nitriding in ammonia-containing nitrogen and hydrogen mixed gas; performing decarburizing annealing at the temperature of between 800 and 860 DEG C; then coating a magnesium oxide isolation layer; raising the temperature to 1,200+/-50 DEG C at the speed of 10 to 20 DEG C per hour in the nitrogen and hydrogen mixed gas, preserving the heat for 10 to 20 hours in hydrogen, and completing high-temperature annealing to obtain a finished product of secondary re-crystallization textures; and coating an insulating stress coating. The method has the advantage of producing the oriented electrical steel without defect on the surface and with strong adhesive force and uniform magnesium silicate bottom layer.

Description

technical field [0001] The invention relates to the technical field of oriented electrical steel, and in particular provides a production method of oriented electrical steel with excellent surface quality. Background technique [0002] Grain oriented electrical steel is a metal soft magnetic material with "Goss texture", that is, (110)<001> crystal texture, the silicon content is usually below 4.5%, and the thickness is 0.10-0.35mm. Grain-oriented electrical steel is mainly used as a core material for transformers due to its excellent magnetic properties along the rolling direction. The production method of grain-oriented electrical steel is proposed by N.P.Goss in U.S. Patent No. 1965559, which is produced by secondary cold rolling with intermediate annealing. The study found that the excellent magnetic energy source of grain-oriented electrical steel sheet is due to the "Goss texture" formed by secondary recrystallization during the final high-temperature annealing ...

Claims

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Application Information

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IPC IPC(8): C21D8/12C22C38/34
Inventor 夏兆所王全礼周谊军许学勇董浩冯莉莉赵楠潘丽梅耿立王崇学张莉霞王宝川
Owner SHOUGANG CORPORATION
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