CN103667881A - Method for producing high-magnetic-induction oriented silicon steel - Google Patents
Method for producing high-magnetic-induction oriented silicon steel Download PDFInfo
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Abstract
The invention discloses a method for producing high-magnetic-induction oriented silicon steel and solves the problems that the unilateral magnetism of finished products is not high and the magnetic percent of pass is unstable in the production of conventional high-magnetic-induction oriented silicon steel. The method comprises the following steps: continuous casting billets are subjected to pre-rolling, heating through an electromagnetic induction heating furnace, rough rolling, finish rolling, normalizing, cold rolling, decarburizing for annealing, high-temperature annealing and stretch leveling annealing to obtain the high-magnetic-induction oriented silicon steel. The temperature of a billet furnace bed side in the heating step of the electromagnetic induction heating furnace is controlled to be 1390-1410 DEG C, the billet furnace bed side after rough rolling is subjected to unilateral heating, and a three-segment type normalizing and annealing process is adopted in the normalizing step, so that the magnetic uniformity of the billet is increased finally, the problem of low magnetic percent of pass of the finished products, caused by the bad unilateral magnetism is fully solved, and the overall average magnetic-induction value is increased.
Description
Technical field
The present invention relates to a kind of production method of silicon steel, specifically a kind of high magentic induction oriented silicon to production method.
Background technology
The congenital inhibitor method of high magnetic induction grain-oriented silicon steel is owing to usining MnS, AlN as important inhibitor, and restraint is strong, has the advantages that finished product magnetic strength is high.MnS solid solubility temperature is high, will make strand heart portion temperature reach MnS solid solubility temperature in traditional heating stove, and its casting blank surface temperature generally will reach 1380 ℃ of left and right, and corresponding furnace temperature requires to reach 1400 ℃ of left and right; Meanwhile, make MnS can be fully, solid solution equably, also need long-time insulation.Because Heating temperature is high, high-temperature holding time is long, use the flame modes such as coal gas to heat, its casting billet surface oxidation is serious, and lumber recovery is low.
Adopt electromagnetic induction principle to heat slab, its heat-up rate is high, and slab inside and outside temperature difference is little; Compare with conventional flame heating furnace, can significantly shorten total time inside furnace and high temperature section time, thereby significantly improve hot-rolled sheet surface quality.But, while adopting the high magentic induction oriented steel that electromagnetic induction heating plate base produces, due to its slab siege side non-uniform temperature, for a long time, have that the monolateral magnetic of finished product is bad, the unsettled phenomenon of magnetic qualification rate.
Summary of the invention
The object of the invention is in order to solve the problems of the technologies described above, provide a kind of high magentic induction oriented silicon to production method, can effectively improve the bad problem of monolateral magnetic because adopting electromagnetic induction heating furnace heating slab to exist, have technique simple, easy and simple to handle, can effectively improve magnetic homogeneity, significantly improve finished product magnetic qualification rate, improve whole average magnetic strength value.
The inventive method comprises continuously cast bloom through rolling in advance, electromagnetic induction heating furnace heating, roughing, finish rolling, normalizing, cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing obtain high magnetic induction grain-oriented silicon steel, wherein,
In described electromagnetic induction heating furnace heating steps, in electromagnetic induction heating furnace, the output rating of rolling in advance the corresponding load coil of rear slab siege side is compared with the high 5-30% of output rating of other corresponding load coil in position of slab, and switchboard biscuit furnace bed side temperature is 1390 ℃～1410 ℃.
In roughing step, the siege side of slab after roughing is carried out to monolateral heating, be 2～10 seconds heat-up time, makes the siege side of slab be heated to 1200 ℃～1250 ℃;
In described normalizing step, adopt syllogic normalizing annealing technique, first, by 1100～1150 ℃ of hot-rolled sheet heating, be incubated 12～60 seconds; Then be cooled to 860 ℃, be again warming up to 880 ℃～900 ℃, insulation 1-2 minute; Finally, at 920～930 ℃, heat 1～2 minute.
In described electromagnetic induction heating stove heating steps, control the siege side of the slab of coming out of the stove and slab medium temperature is poor is not more than 10 ℃.
Described rolling in advance in step, continuously cast bloom rolls in advance after gas furnace low-temperature prewarming again, and controlling preheating temperature is 1180 ℃～1250 ℃, and the rate that presses down of rolling is in advance 10-30%, and lateral pressure amount is 80-150mm.
The finishing temperature of described roughing is 1170 ℃～1210 ℃, and described finish rolling finishing temperature is 950 ℃～1050 ℃, thickness of slab 2.0～2.3mm after finish rolling.
After steel plate after normalizing is cooled to 50～80 ℃, carry out cold rollingly, adopt asymmetrical quick water-cooled, coolant water temperature is controlled at 40～60 ℃, and the siege side speed of cooling of slab is 40～70 ℃/S, compared with slow 5～10 ℃/S of other position speed of cooling.
Continuously cast bloom rolls in advance after gas furnace low-temperature prewarming again, apply the draft of 10-30%, apply lateral pressure amount more than 100mm simultaneously, the column crystal in Bu Ji bight, broken slab limit before entering electromagnetic oven, generation is split on the limit of reducing in course of hot rolling, like this, after electromagnetic induction adds stove heating, slab top layer and bight column crystal can be too inflourishing, reduce finished product wire carefully brilliant, improve magnetic homogeneity and the stability of finished product; The control of lateral pressure amount, is conducive to significantly improve the magnetic of limit portion.
Further, when contriver finds that slab is in magneticinduction process furnace, be placed on the heating resisting metal cushion block on siege, and siege is equipped with circulating water cooling device, thereby the temperature that causes contact plate biscuit furnace bed side is on the low side compared with all the other positions, finished product magnetic temperature stability corresponding position is poor, and magnetic is inhomogeneous.For the problems referred to above, contriver is by increasing the output rating of the corresponding load coil of electromagnetic induction heating furnace inner panel biscuit furnace bed side, make its output rating compared with other corresponding load coil in position of slab increase by 5～30%, to solve the lower problem of slab siege side temperature, the siege side temperature of simultaneously controlling slab is 1390～1410 ℃, avoids steel slab surface oxidation; While guaranteeing to come out of the stove, the temperature head at slab siege side and slab middle part is not more than 10 ℃, to avoid limit portion crackle and magnetic to worsen the generation of phenomenon.
Further, contriver, after roughing, also carries out monolateral heating to the limit portion of slab siege side, makes this temperature reach 1200～1250 ℃, thereby the object of doing is like this to improve the horizontal magnetic homogeneity of slab in order to reduce the temperature head at limit portion and middle part; 1170 ℃～1210 ℃ of roughing finishing temperatures, finish rolling finishing temperature is controlled at 950～1050 ℃, is chilled to soon 520 ℃-550 ℃ after finish rolling completes again, and thickness of slab is controlled at 2.0mm-2.3mm, controls evenly tiny separating out in a large number of MnS, avoids separating out in a large number of AlN simultaneously.
Described normalizing is syllogic normalizing annealing technique, its objective is in order to improve magnetic qualification rate, improves the homogeneity of magnetic, the asymmetrical quick water-cooled of cooling employing after normalizing, and coolant water temperature is controlled at 40～60 ℃; The siege side speed of cooling of slab is 40～70 ℃/S, compared with slow 5～10 ℃/S of other position speed of cooling.The stability of separating out to improve AlN.
Beneficial effect
Technique of the present invention is simple, for the bad low problem of finished product magnetic qualification rate causing of one-sided magnetic, by the improvement to technique, improve the magnetic homogeneity of slab, significantly reduce the finished product magnetic qualification rate causing because one-sided magnetic is bad, improve whole average magnetic strength value.
Embodiment
Embodiment:
By continuously cast bloom after gas furnace low-temperature prewarming, roll in advance again, electromagnetic induction heating furnace heating, roughing, finish rolling, normalizing, cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing obtains high magnetic induction grain-oriented silicon steel,
Wherein,
1. gas furnace low-temperature prewarming: continuously cast bloom is sent into gas furnace low-temperature prewarming to 1180～1250 ℃.
2. roll in advance: the continuously cast bloom after preheating is carried out to 1-3 road and roll in advance, controlling the rate that presses down of rolling is in advance 10-30%, and lateral pressure amount is 80-150mm.
3. electromagnetic induction heating furnace heating: the slab after rolling is in advance sent into electromagnetic induction heating furnace and heat, controlling furnace temperature is 1400 ℃, making the output rating of the corresponding load coil of siege side of slab is 1000～1500kw, compared with the high 5-30% of output rating of other corresponding load coil in position of slab, switchboard biscuit furnace bed side temperature is 1390～1410 ℃, the siege side of the slab that makes to come out of the stove and slab medium temperature is poor is not more than 10 ℃.
4. roughing, finish rolling: the slab after coming out of the stove is carried out to the roughing of 5-7 road, then through 7 passage finish rolling, be quickly cooled to 550 ℃, obtain the hot-rolled sheet of 2.0-2.3mm.Wherein, the siege side of slab after roughing is carried out to finish rolling again after monolateral heating, be 2～10 seconds heat-up time, Heating temperature is 1200～1250 ℃, make the temperature of the siege side of slab reach 1200～1250 ℃ in finish rolling ingress, the finishing temperature of described roughing is 1170 ℃～1210 ℃, and described finish rolling finishing temperature is 950 ℃～1050 ℃, thickness of slab 2.0～2.3mm after finish rolling.
5. normalizing: hot-rolled sheet is carried out to syllogic normalizing annealing, first by 1100～1150 ℃ of steel plate heating, be incubated 12～60 seconds (for 1 section of normalizing); Then be cooled to 860 ℃, be again warming up to 880 ℃～900 ℃, be incubated 1-2 minute (for 2 sections of normalizing); Finally, at 920～930 ℃, heat 1～2 minute (for 3 sections of normalizing); After slab after normalizing is cooled to 50～80 ℃, carry out cold rollingly, adopt asymmetrical quick water-cooled, coolant water temperature is controlled at 40～60 ℃, and the siege side speed of cooling of slab is 40～70 ℃/S, compared with slow 5～10 ℃/S of other position speed of cooling.
6. the cooled steel plate of pair normalizing carries out cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing and obtains high magnetic induction grain-oriented silicon steel,
The embodiment of the present invention 1-8 carrying out according to above-mentioned technique and the composition of comparative example and technique and implementation result are referring to table 1.
Composition and the main technologic parameters of table 1-1 embodiment 1-8 and comparative example
Composition and the main technologic parameters of table 1-2 embodiment and comparative example
Comparative example:
By continuously cast bloom after gas furnace low-temperature prewarming again through rolling in advance, electromagnetic induction heating furnace heating, roughing, finish rolling, normalizing, cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing obtains high magnetic induction grain-oriented silicon steel,
Wherein,
1, gas furnace low-temperature prewarming: continuously cast bloom is sent into gas furnace low-temperature prewarming to 1200 ℃.
Roughing: the continuously cast bloom after preheating is carried out to 3 road roughing, and the rate that presses down of controlling roughing is 13%, and lateral pressure amount is 60mm.
3, electromagnetic induction heating furnace heating: the slab after roughing is sent into electromagnetic induction heating furnace and heat, controlling furnace temperature is 1400 ℃, and the FR load coil output rating of slab is evenly set.
4, roughing, finish rolling: the slab after coming out of the stove is carried out to the roughing of 5-7 road, 1180～1200 ℃ of roughing finishing temperatures; Again through 7 passage finish rolling to 2.0-2.3mm, 920～1020 ℃ of finish rolling finishing temperatures; Be chilled to soon again 550 ℃, complete hot rolling.
5, normalizing: hot-rolled sheet is carried out to two-part normalizing annealing, first by 1100～1150 ℃ of heating of plate blanks, be incubated 12～60 seconds (for 1 section of normalizing); Then be cooled to 860 ℃, be again warming up to 880 ℃～900 ℃, be incubated 1-2 minute (for 2 sections of normalizing); After slab after normalizing is cooled to 50～80 ℃, carry out cold rollingly, coolant water temperature is controlled at 40～60 ℃, and the even speed of cooling of plate face is 40～80 ℃/S.
6, the cooled steel plate of normalizing is carried out to cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing and obtain high magnetic induction grain-oriented silicon steel.
7, obtain qualified 90% left and right that reaches of magnetic of finished product, the bad incidence 10～18% of monolateral magnetic.Through the test of epstein frame method, the B of typical sample
800: 1.925T, P
17/50: 1.009w/kg.
Claims (5)
1. a production method for high magnetic induction grain-oriented silicon steel, comprises continuously cast bloom through rolling in advance, electromagnetic induction heating furnace heating, roughing, finish rolling, normalizing, cold rolling, decarburizing annealing, high temperature annealing and stretching and leveling annealing obtains high magnetic induction grain-oriented silicon steel, it is characterized in that,
In described electromagnetic induction heating furnace heating steps, in electromagnetic induction heating furnace, the output rating of rolling in advance the corresponding load coil of rear slab siege side is compared with the high 5-30% of output rating of other corresponding load coil in position of slab, and switchboard biscuit furnace bed side temperature is 1390 ℃～1410 ℃.
In roughing step, the siege side of slab after roughing is carried out to monolateral heating, be 2～10 seconds heat-up time, makes the siege side of slab be heated to 1200 ℃～1250 ℃;
In described normalizing step, adopt syllogic normalizing annealing technique, first, by 1100～1150 ℃ of hot-rolled sheet heating, be incubated 12～60 seconds; Then be cooled to 860 ℃, be again warming up to 880 ℃～900 ℃, insulation 1-2 minute; Finally, at 920～930 ℃, heat 1～2 minute.
2. the production method of high magnetic induction grain-oriented silicon steel as claimed in claim 1, is characterized in that, in described electromagnetic induction heating stove heating steps, controls the siege side of the slab of coming out of the stove and slab medium temperature is poor is not more than 10 ℃.
3. the production method of high magnetic induction grain-oriented silicon steel as claimed in claim 1 or 2, is characterized in that, describedly rolls in advance in step, continuously cast bloom rolls in advance after gas furnace low-temperature prewarming again, controlling preheating temperature is 1180 ℃～1250 ℃, and the rate that presses down of rolling is in advance 10-30%, and lateral pressure amount is 80-150mm.
4. the production method of high magnetic induction grain-oriented silicon steel as claimed in claim 1 or 2, is characterized in that, the finishing temperature of described roughing is 1170 ℃～1210 ℃, and described finish rolling finishing temperature is 950 ℃～1050 ℃, thickness of slab 2.0～2.3mm after finish rolling.
5. the production method of high magnetic induction grain-oriented silicon steel as claimed in claim 1 or 2; it is characterized in that; after steel plate after normalizing is cooled to 50～80 ℃, carry out cold rolling; adopt asymmetrical quick water-cooled; coolant water temperature is controlled at 40～60 ℃; the siege side speed of cooling of slab is 40～70 ℃/S, compared with slow 5～10 ℃/S of other position speed of cooling.
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Cited By (8)
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| CN104816135A (en) * | 2015-05-07 | 2015-08-05 | 马钢(集团)控股有限公司 | Electrical steel and manufacturing method thereof |
| CN107002157A (en) * | 2014-10-15 | 2017-08-01 | Sms集团有限公司 | For the grain oriented electrical steel strip starting for manufacturing the technique of grain oriented electrical steel strip starting and being obtained according to the technique |
| CN113059002A (en) * | 2021-02-18 | 2021-07-02 | 张家港宏昌钢板有限公司 | Method for eliminating edge peeling of silicon steel and silicon steel |
| CN113458142A (en) * | 2021-07-05 | 2021-10-01 | 湖南华菱涟源钢铁有限公司 | Medium-temperature common oriented silicon steel and preparation method thereof |
| CN114457225A (en) * | 2022-01-18 | 2022-05-10 | 安阳钢铁股份有限公司 | Normalizing process for improving inhibiting capability of high magnetic induction oriented silicon steel inhibitor |
| CN114535315A (en) * | 2022-02-08 | 2022-05-27 | 山西太钢不锈钢股份有限公司 | Process for preventing high magnetic induction oriented silicon steel from hot rolling edge crack |
| CN114622076A (en) * | 2022-03-11 | 2022-06-14 | 安阳钢铁股份有限公司 | Preparation method of low-temperature high-magnetic-induction oriented silicon steel |
| CN115433869A (en) * | 2022-09-23 | 2022-12-06 | 无锡普天铁心股份有限公司 | Method for improving wide-direction magnetic uniformity of low-temperature high-magnetic-induction oriented silicon steel plate |
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| CN113458142A (en) * | 2021-07-05 | 2021-10-01 | 湖南华菱涟源钢铁有限公司 | Medium-temperature common oriented silicon steel and preparation method thereof |
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| CN114535315B (en) * | 2022-02-08 | 2023-10-20 | 山西太钢不锈钢股份有限公司 | Process for preventing hot rolling edge crack of high-magnetic-induction oriented silicon steel |
| CN114622076A (en) * | 2022-03-11 | 2022-06-14 | 安阳钢铁股份有限公司 | Preparation method of low-temperature high-magnetic-induction oriented silicon steel |
| CN115433869A (en) * | 2022-09-23 | 2022-12-06 | 无锡普天铁心股份有限公司 | Method for improving wide-direction magnetic uniformity of low-temperature high-magnetic-induction oriented silicon steel plate |
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