CN103667881B - Method for producing high-magnetic-induction oriented silicon steel - Google Patents
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- CN103667881B CN103667881B CN201310704349.9A CN201310704349A CN103667881B CN 103667881 B CN103667881 B CN 103667881B CN 201310704349 A CN201310704349 A CN 201310704349A CN 103667881 B CN103667881 B CN 103667881B
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000000137 annealing Methods 0.000 claims abstract description 27
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000005097 cold rolling Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 25
- 230000006698 induction Effects 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010606 normalization Methods 0.000 claims 1
- 230000005389 magnetism Effects 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
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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 invention relates to a production method of silicon steel, in particular to a production method of high magnetic induction oriented silicon.
Background
The high magnetic induction oriented silicon steel innate inhibitor method has the characteristics of strong inhibition force and high finished product magnetic induction due to the fact that MnS and AlN are used as important inhibitors. The MnS solid solution temperature is high, the core temperature of a casting blank in a traditional heating furnace is required to reach the MnS solid solution temperature, the surface temperature of the casting blank generally reaches about 1380 ℃, and the corresponding furnace temperature requirement reaches about 1400 ℃; meanwhile, in order to sufficiently and uniformly dissolve MnS, a long-term heat preservation is required. Because the heating temperature is high, the high-temperature heat preservation time is long, the surface of the casting blank is seriously oxidized by heating in a flame mode of coal gas and the like, and the yield is low.
The plate blank is heated by adopting the electromagnetic induction principle, the temperature rise speed is high, and the temperature difference between the inside and the outside of the plate blank is small; compared with the conventional flame heating furnace, the total furnace time and the high-temperature period time can be greatly shortened, so that the surface quality of the hot rolled plate is greatly improved. However, in the case of high magnetic induction oriented steel produced by heating a slab by electromagnetic induction, the temperature on the hearth side of the slab is not uniform, and therefore, the magnetic properties of the finished product are not good on one side and the magnetic yield is not stable for a long time.
Disclosure of Invention
The invention aims to solve the technical problems, provides a high-magnetic-induction oriented silicon production method, can effectively solve the problem of poor unilateral magnetism of a heating plate blank adopting an electromagnetic induction heating furnace, and has the advantages of simple process, simplicity and convenience in operation, capability of effectively improving the magnetic uniformity, greatly improving the magnetic qualification rate of a finished product and improving the integral average magnetic induction value.
The method comprises the steps of pre-rolling the continuous casting billet, heating the continuous casting billet by an electromagnetic induction heating furnace, rough rolling, finish rolling, normalizing, cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing to obtain the high magnetic induction oriented silicon steel, wherein,
in the heating step of the electromagnetic induction heating furnace, in the electromagnetic induction heating furnace, the output power of the induction heating coil corresponding to the furnace side of the pre-rolled slab is 5-30% higher than the output power of the induction heating coil corresponding to other parts of the slab, and the temperature of the furnace side of the slab is controlled to be 1390-1410 ℃.
In the rough rolling step, heating the hearth side of the rough-rolled plate blank to be unilateral for 2-10 seconds to heat the hearth side of the plate blank to 1200-1250 ℃;
in the normalizing step, a three-stage normalizing annealing process is adopted, the hot rolled plate is heated to 1100-1150 ℃, and the temperature is kept for 12-60 seconds; then cooling to 860 ℃, raising the temperature to 880-900 ℃ again, and preserving the heat for 1-2 minutes; finally, heating for 1-2 minutes at 920-930 ℃.
In the heating step of the electromagnetic induction heating furnace, the temperature difference between the side of a furnace bed of the discharged plate blank and the middle of the plate blank is controlled to be not more than 10 ℃.
In the pre-rolling step, the continuous casting billet is pre-rolled after being preheated by a gas furnace at a low temperature, the preheating temperature is controlled to be 1180-1250 ℃, the pre-rolling reduction rate is 10-30%, and the side pressure is 80-150 mm.
The finish rolling temperature of the rough rolling is 1170-1210 ℃, the finish rolling temperature of the finish rolling is 950-1050 ℃, and the thickness of the plate after the finish rolling is 2.0-2.3 mm.
And cooling the normalized steel plate to 50-80 ℃, then carrying out cold rolling, and adopting asymmetric rapid water cooling, wherein the cooling water temperature is controlled to be 40-60 ℃, the cooling speed of the hearth side of the plate blank is 40-70 ℃/S, and the cooling speed is 5-10 ℃/S slower than that of other parts.
The continuous casting billet is preheated by a gas furnace at low temperature and then is pre-rolled, the reduction rate of 10-30 percent is applied, the side pressure of more than 100mm is applied, the columnar crystals at the edge part and the corner part of the slab are crushed before entering an electromagnetic furnace, and the edge crack in the hot rolling process is reduced, so that after the continuous casting billet is heated by an electromagnetic induction furnace, the columnar crystals at the surface layer and the corner part of the slab are not over developed, the linear fine crystals of a finished product are reduced, and the magnetic uniformity and the stability of the finished product are improved; the control of the side pressure is beneficial to obviously improving the magnetism of the edge.
Further, the inventors found that when the slab is placed in the magnetic induction heating furnace, the slab is placed on a heat-resistant metal pad on a hearth, and the hearth is provided with a circulating water cooling device, so that the temperature of the side of the hearth contacting the slab is lower than that of the rest of the slab, and the finished product at the corresponding part has poor magnetic stability and uneven magnetism. In order to solve the problems, the inventor increases the output power of an induction heating coil corresponding to the hearth side of the plate blank in the electromagnetic induction heating furnace by 5-30% compared with the output power of the induction heating coil corresponding to other parts of the plate blank so as to solve the problem of low temperature of the hearth side of the plate blank, controls the hearth side temperature of the plate blank to 1390-1410 ℃ and avoids the surface oxidation of the plate blank; and ensuring that the temperature difference between the hearth side of the slab blank and the middle part of the slab blank is not more than 10 ℃ during tapping so as to avoid the occurrence of edge cracks and magnetic deterioration phenomena.
Further, after rough rolling, the inventor also carries out unilateral heating on the side edge part of the slab hearth to enable the temperature of the side edge part to reach 1200-1250 ℃, and the purpose of doing so is to reduce the temperature difference between the side part and the middle part and improve the transverse magnetic uniformity of the slab; the rough rolling finishing temperature is 1170-1210 ℃, the finish rolling temperature is controlled at 950-1050 ℃, the steel is rapidly cooled to 520-550 ℃ after finish rolling, the thickness of the steel plate is controlled at 2.0-2.3mm, MnS is controlled to be uniformly and finely precipitated in large quantity, and AlN is prevented from being precipitated in large quantity.
The normalizing is a three-section normalizing annealing process, and aims to improve the qualified rate of magnetism and improve the uniformity of magnetism, wherein asymmetrical rapid water cooling is adopted for cooling after normalizing, and the temperature of cooling water is controlled to be 40-60 ℃; the cooling speed of the hearth side of the plate blank is 40-70 ℃/S, and is 5-10 ℃/S slower than that of other parts. To improve the stability of AlN precipitation.
Advantageous effects
The method has simple process, improves the magnetic uniformity of the plate blank by improving the process aiming at the problem of low magnetic qualified rate of finished products caused by poor single-side magnetism, greatly reduces the magnetic qualified rate of the finished products caused by the poor single-side magnetism, and improves the integral average magnetic induction value.
Detailed Description
Example (b):
preheating a continuous casting billet by a gas furnace at a low temperature, pre-rolling, heating by an electromagnetic induction heating furnace, rough rolling, finish rolling, normalizing, cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing to obtain high-magnetic-induction oriented silicon steel,
wherein,
1. low-temperature preheating of the gas furnace: and (3) feeding the continuous casting billets into a gas furnace, and preheating to 1180-1250 ℃.
2. Pre-rolling: and (3) pre-rolling the preheated continuous casting billet for 1-3 times, wherein the lower rolling rate of the pre-rolling is controlled to be 10-30%, and the side pressure is controlled to be 80-150 mm.
3. Heating by an electromagnetic induction heating furnace: and (2) feeding the pre-rolled plate blank into an electromagnetic induction heating furnace for heating, controlling the furnace temperature to 1400 ℃, enabling the output power of an induction heating coil corresponding to the hearth side of the plate blank to be 1000-1500 kw, being 5-30% higher than the output power of induction heating coils corresponding to other parts of the plate blank, controlling the temperature of the hearth side of the plate blank to be 1390-1410 ℃, and enabling the temperature difference between the hearth side of the plate blank discharged from the furnace and the plate blank to be not more than 10 ℃.
4. Rough rolling and finish rolling: and (3) carrying out 5-7 times of rough rolling on the plate blank discharged from the furnace, then carrying out 7 times of finish rolling, and rapidly cooling to 550 ℃ to obtain a hot rolled plate with the thickness of 2.0-2.3 mm. The method comprises the steps of heating the hearth side of a roughly rolled plate blank in a unilateral manner, then performing finish rolling, wherein the heating time is 2-10 seconds, the heating temperature is 1200-1250 ℃, the temperature of the hearth side of the plate blank reaches 1200-1250 ℃ at a finish rolling inlet, the finish rolling temperature of rough rolling is 1170-1210 ℃, the finish rolling temperature is 950-1050 ℃, and the thickness of the plate after finish rolling is 2.0-2.3 mm.
5. Normalizing: carrying out three-stage normalizing annealing on the hot rolled plate, heating the steel plate to 1100-1150 ℃, and keeping the temperature for 12-60 seconds (normalizing stage 1); then cooling to 860 ℃, raising the temperature to 880-900 ℃ again, and preserving the heat for 1-2 minutes (a normalizing stage 2); finally, heating for 1-2 minutes at 920-930 ℃ (normalizing for 3 sections); and cooling the normalized plate blank to 50-80 ℃, then carrying out cold rolling, and adopting asymmetric rapid water cooling, wherein the cooling water temperature is controlled to be 40-60 ℃, the cooling speed of the hearth side of the plate blank is 40-70 ℃/S, and the cooling speed is 5-10 ℃/S slower than that of other parts.
6. Cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing are carried out on the steel plate after the normalized cooling to obtain the high magnetic induction oriented silicon steel,
the compositions and processes and effects of the examples 1 to 8 of the present invention and comparative examples conducted according to the above-described processes are shown in Table 1.
Table 1-1 ingredients and main process parameters of examples 1-8 and comparative examples
Tables 1-2 compositions and Main Process parameters of examples and comparative examples
Comparative example:
preheating the continuous casting billet by a gas furnace at low temperature, then performing pre-rolling, heating by an electromagnetic induction heating furnace, rough rolling, finish rolling, normalizing, cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing to obtain high magnetic induction oriented silicon steel,
wherein,
1. low-temperature preheating of the gas furnace: and (3) feeding the continuous casting billets into a gas furnace for low-temperature preheating to 1200 ℃.
Rough rolling: and (3) carrying out rough rolling on the preheated continuous casting billet, wherein the lower pressing rate of the rough rolling is controlled to be 13%, and the side pressure is controlled to be 60 mm.
3. Heating by an electromagnetic induction heating furnace: and (3) feeding the rough-rolled plate blank into an electromagnetic induction heating furnace for heating, controlling the furnace temperature to 1400 ℃, and uniformly setting the output power of the induction heating coil in the whole range of the plate blank.
4. Rough rolling and finish rolling: carrying out 5-7 times of rough rolling on the plate blank discharged from the furnace, wherein the final rolling temperature of the rough rolling is 1180-1200 ℃; then, carrying out 7-pass finish rolling to 2.0-2.3mm, wherein the finish rolling temperature is 920-1020 ℃; and then quickly cooling to 550 ℃, and finishing hot rolling.
5. Normalizing: carrying out two-stage normalizing annealing on the hot rolled plate, heating the plate blank to 1100-1150 ℃, and keeping the temperature for 12-60 seconds (normalizing stage 1); then cooling to 860 ℃, raising the temperature to 880-900 ℃ again, and preserving the heat for 1-2 minutes (a normalizing stage 2); and cooling the normalized plate blank to 50-80 ℃, and then carrying out cold rolling, wherein the cooling water temperature is controlled to be 40-60 ℃, and the uniform cooling speed of the plate surface is 40-80 ℃/S.
6. And carrying out cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing on the steel plate after the normalized cooling to obtain the high-magnetic-induction oriented silicon steel.
7. The magnetic qualification rate of the obtained finished product reaches about 90%, and the incidence rate of single-side magnetic defects is 10-18%. B of a typical sample, as measured by the Epstein method800：1.925T，P17/50：1.009w/kg。
Claims (4)
1. A production method of high magnetic induction oriented silicon steel comprises the steps of pre-rolling a continuous casting billet, heating the continuous casting billet by an electromagnetic induction heating furnace, rough rolling, finish rolling, normalizing, cold rolling, decarburization annealing, high-temperature annealing and stretching and flattening annealing to obtain the high magnetic induction oriented silicon steel,
in the heating step of the electromagnetic induction heating furnace, in the electromagnetic induction heating furnace, the output power of an induction heating coil corresponding to the furnace side of the pre-rolled slab is 5-30% higher than the output power of induction heating coils corresponding to other parts of the slab, the temperature of the furnace side of the slab is controlled to be 1390-1410 ℃, and the temperature difference between the furnace side of the slab discharged from the furnace and the slab is controlled to be not more than 10 ℃;
in the rough rolling step, heating the hearth side of the rough-rolled plate blank to be unilateral for 2-10 seconds to heat the hearth side of the plate blank to 1200-1250 ℃;
in the normalizing step, a three-stage normalizing annealing process is adopted, the hot rolled plate is heated to 1100-1150 ℃, and the temperature is kept for 12-60 seconds; then cooling to 860 ℃, raising the temperature to 880-900 ℃ again, and preserving the heat for 1-2 minutes; finally, heating for 1-2 minutes at 920-930 ℃.
2. The method for producing high magnetic induction oriented silicon steel according to claim 1, wherein in the pre-rolling step, the continuous casting slab is pre-rolled after being preheated by a gas furnace at a low temperature, the preheating temperature is controlled to be 1180-1250 ℃, the pre-rolling reduction rate is 10-30%, and the side pressure is 80-150 mm.
3. The method for producing a high-magnetic-induction oriented silicon steel according to claim 1, wherein the finish rolling temperature of the rough rolling is 1170 to 1210 ℃, the finish rolling temperature of the finish rolling is 950 to 1050 ℃, and the thickness of the plate after the finish rolling is 2.0 to 2.3 mm.
4. The method for producing a high magnetic induction oriented silicon steel as claimed in claim 1, wherein the steel sheet after normalization is cooled to 50 to 80 ℃ and then cold-rolled, and asymmetric rapid water cooling is employed, the cooling water temperature is controlled to 40 to 60 ℃, the cooling rate of the slab on the hearth side is 40 to 70 ℃/S, and the cooling rate is 5 to 10 ℃/S slower than that of the other portions.
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| US11239012B2 (en) | 2014-10-15 | 2022-02-01 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip |
| CN104816135B (en) * | 2015-05-07 | 2017-08-25 | 马钢(集团)控股有限公司 | A kind of electrical sheet and its manufacture method |
| CN113059002B (en) * | 2021-02-18 | 2022-06-14 | 张家港宏昌钢板有限公司 | Method for eliminating edge peeling of silicon steel and silicon steel |
| CN113458142B (en) * | 2021-07-05 | 2022-04-08 | 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 |
| 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 |
| CN115433869B (en) * | 2022-09-23 | 2023-05-05 | 无锡普天铁心股份有限公司 | Method for improving magnetic uniformity of low-temperature high-magnetic induction oriented silicon steel plate in width direction |
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| JP2580403B2 (en) * | 1991-05-17 | 1997-02-12 | 新日本製鐵株式会社 | Hot rolling method for continuous cast slab for unidirectional electrical steel sheet. |
| JP4894146B2 (en) * | 2005-01-31 | 2012-03-14 | Ｊｆｅスチール株式会社 | Heating method for grain-oriented electrical steel slab |
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| CN101181718A (en) * | 2007-12-11 | 2008-05-21 | 武汉钢铁(集团)公司 | Method for producing wide strip steel by bar strip continuous casting and rolling as well as system therefor |
| CN101618501A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Production method of non-oriented silicon steel with improved head and tail performance |
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