CN102127709A - Low-temperature slab heating high magnetic induction grain-oriented silicon steel and production method thereof - Google Patents
Low-temperature slab heating high magnetic induction grain-oriented silicon steel and production method thereof Download PDFInfo
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- CN102127709A CN102127709A CN 201110008677 CN201110008677A CN102127709A CN 102127709 A CN102127709 A CN 102127709A CN 201110008677 CN201110008677 CN 201110008677 CN 201110008677 A CN201110008677 A CN 201110008677A CN 102127709 A CN102127709 A CN 102127709A
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Abstract
The invention relates to low-temperature slab heating high magnetic induction grain-oriented silicon steel and a production method thereof, belonging to the technical field of silicon steel production. The silicon steel comprises the following components in percentage by weight: 0.035-0.06% of C, 2.5-3.5 of Si, 0.08-1.8% of Mn, 0.005-0.01 of S, 0.015-0.035% of Al, 0.005-0.009% of N, 0.01-0.015% of Sn, 0.01-0.03% of P, 0.05-0.12% of Cu and the balance of Fe and unavoidable foreign matters. The billet heating temperature is reduced to 1,100-1,200 DEG C, which is much lower than the billet heating temperature of the conventional high magnetic induction grain-oriented silicon steel; the finished steel bands with stable performance and high yield are obtained by a method comprising the following steps of: performing hot rolling, normalizing, acid-washing and cold rolling billets; and then decarburizing annealing and nitriding; and finally performing high-temperature annealing. The invention solves the problems of the conventional high magnetic induction grain-oriented silicon steel, caused by over-high billet heating temperature.
Description
Technical field
The invention belongs to the silicon steel production technical field, particularly a kind of low temperature slab heating high magnetic induction grain-oriented silicon steel and manufacture method.
Background technology
High magnetic induction grain-oriented silicon steel is a kind of very important ferrous materials.Traditional high magnetic induction grain-oriented silicon steel technological process of production is as follows:
Hot rolling: 1380～1400 ℃ of slab heating, and be incubated more than 30 minutes, purpose is to make its MnS, AlN etc. reach complete solid solution condition.The strand first de-scaling in back of coming out of the stove, after roughing and finish rolling, finishing temperature is controlled at＞950 ℃, after immediately water spray be cooled to about 550 ℃ and batch.
Normalizing: one adopts two-part normalizing system, and 1100～1120 ℃ * 2～4min+850～950 ℃, water spray is extremely cold after the normalizing.
Pickling: carry out shot peening after normalizing is handled and in 80～90 ℃ dilute hydrochloric acid pickling 1～2min, the limit is cut the back and is prepared cold rolling.
Cold rolling: one adopts once cold rolling technology high magnetic induction grain-oriented silicon steel, and the high magnetic induction grain-oriented silicon steel resistance to deformation is big, and one is cold rolling at 20 roller mills, is cold rolled to target thickness through 5～7 roads, and average per pass draft is 25%～33%.Suitable total draft is 82%～90%.Extensively adopt cold rolling aging technique for further reducing iron loss, produce now to go up.Former roads use the asperities working roll, and per pass is cold rolling through about 30% heavy reduction rate, close oiling system and fast speed rolling.Rely on the distortion heat when rolling that the cold-rolled steel strip temperature is brought up to about 200 ℃.
Decarburizing annealing: the steel band that is cold rolled to finished product thickness carries out decarburizing annealing in continuous oven.Main purpose has: (1) finishes primary recrystallization, makes (110) that sufficient amount is arranged in the matrix { the first crystal grain of 001} (secondary nucleus) and help primary recrystallization texture and the tissue that they are grown up; (2) carbon in the steel is taken off to below 0.003%, be in single α-phase after guaranteeing during high temperature annealing; (3) steel strip surface forms fine and close SiO uniformly
2Film (2～3 μ m are thick).One decarburizing annealing technology is 825～855 ℃ * 2～4min that is rapidly heated, and protective atmosphere is wet H
2+ N
2Gas mixture, dew point is at+35～45 ℃.
Be coated with the MgO separant: it is bonding when preventing steel band rolling high temperature annealing being coated with the MgO purpose; MgO and steel strip surface SiO when high temperature annealing is raised to about 1000 ℃
2Oxide film react with (2MgO+SiO
2→ Mg2SiO
4), form magnesium silicate glass film bottom.The MgO coating is usually carried out on same lines with continuous oven decarburizing annealing, and by the coating unit, roller coat or spraying MgO suspension are also dried.
High temperature annealing: the purpose of high temperature annealing is to make steel plate finish secondary recrystallization and purify to remove sulphur and nitrogen in the steel.
Smooth stretching annealing and coated insulating film:
Because the thermal stresses effect makes strip deformation, need carry out smooth stretching annealing behind the rolling high temperature annealing.Coated insulating film makes the finished product steel plate have certain insulativity and erosion property behind the high temperature annealing.Coated insulating film and smooth stretching annealing are finished at same lines.
For the production technique of above-mentioned traditional high magnetic induction grain-oriented silicon steel, there is following shortcoming:
(1) because the slab heating temperature height, the peroxidation of strand increases the scaling loss amount, and the furnace bottom accumulated slag is serious, yield poorly, the maintenance cost height.
(2) energy consumption is many, manufacturing cost is high, and the hot rolling band easily produces the limit and splits, and lumber recovery reduces, and manufacturing cost increases
(3) composition range is strict, and surface defects of products is many, the magnetic property instability.
Summary of the invention
The object of the present invention is to provide a kind of low temperature slab heating high magnetic induction grain-oriented silicon steel and manufacture method, effectively solved traditional high magnetic induction grain-oriented silicon steel because the too high problems of bringing of slab heating temperature, guaranteeing to have reduced energy consumption under the stable prerequisite of product performance, making the technological process of production of high magnetic induction grain-oriented silicon steel stable more, efficient; Have a good application prospect.
The composition of oriented silicon steel of the present invention (weight percent) is:
The weight percent of composition is:
C:0.035～0.06%, Si:2.5～3.5%, Mn:0.08～1.8%, S:0.005～0.01%, Al:0.015～0.035%, N:0.005～0.009%, Sn:0.01～0.015%, P:0.01～0.03%, Cu:0.05～0.12%, surplus is Fe and inevitable inclusion.
Oriented silicon steel production method of the present invention comprises following processing step:
(1) smelt: with converter or Electric furnace steel making, the molten steel of mentioned component obtains strand behind secondary refining and continuous casting;
(2) hot rolling, strand are heated to 1100～1200 ℃, 1000～1100 ℃ of start rolling temperatures, and finishing temperature is at 850～950 ℃, 550～650 ℃ of the temperature of curling;
(3) normalizing: two-part normalizing annealing, hot-rolled sheet are carried out 1000～1150 ℃, time: 30～150s, and 850～950 ℃, time 30～200s, and cool off fast, cooling rate is not less than 25 ℃/s;
(4) cold rolling: as to adopt the once cold rolling method to roll the finished product thickness of slab, its final draft 83～92%;
(5) decarburizing annealing and nitriding are handled, and the steel band that is rolled down to finished product thickness is carried out being coated with the high temperature annealing separant that MgO is the master after decarburizing annealing and the nitriding processing;
Wherein decarburizing annealing technology comprises:
Dew point: 60～70 ℃, temperature: 810～880 ℃, decarburizing annealing time: 50～150s, decarburizing atmosphere: H
2, N
2Mixed atmosphere, hydrogen ratio 20～80% (percent by volume);
Wherein nitridation process comprises:
Dew point: be not higher than-20 ℃, nitriding temperature: 700～900 ℃, nitriding time: 10～50s, nitriding atmosphere: H
2, N
2, NH
3Mixed atmosphere, hydrogen: 20～80%, ammonia: 0.1～15% (percent by volume); Nitriding amount: 50～300ppm.
(6) high temperature annealing and smooth annealing: high temperature annealing and smooth annealing process carry out routinely.
Advantage of the present invention: reduced slab heating temperature, reduced energy consumption, improved production efficiency; Cost is low, and product performance are stable, and surface quality is good
Embodiment
Embodiment 1: the chemical ingredients of steel and hot rolling technology as shown in Table 1 and Table 2, hot-rolled sheet is after 1120 ℃ * 1min+900 ℃ * 2min normalizing and 40 ℃/s cooling, once cold rolling is to 0.285mm, through decarburization and 750 ℃ of nitridings, the nitriding amount is respectively A:150ppm; B:170ppm, the finished product steel belt magnetic property behind the separant coating high temperature annealing is as shown in table 3.
Table 1 experimental steel chemical ingredients (weight percent) surplus: Fe
| Embodiment | C％ | Si％ | Mn％ | S％ | Als％ | N％ | P％ | Cu％ | Sn％ |
| A | 0.056 | 3.22 | 0.11 | 0.0075 | 0.030 | 0.0069 | 0.027 | 0.088 | 0.047 |
| B | 0.049 | 3.25 | 0.09 | 0.0062 | 0.025 | 0.0078 | 0.026 | 0.056 | 0.077 |
Table 2 hot-rolled process parameter
| Embodiment | Slab heating temperature | Finishing temperature | Curling temperature | Final thickness |
| A | 1180℃ | 930℃ | 550℃ | 2.3mm |
| B | 1140℃ | 910℃ | 530℃ | 2.3mm |
Table 3 experimental result
| Embodiment | B 8(T) | P 17/50(w/kg) |
| A | 1.92 | 0.97 |
| B | 1.91 | 1.01 |
Embodiment 2: carried out the experiment of nitriding amount and the finished product performance with B hot rolling technology in A composition and the table 2 in the table 1, as shown in table 4:
Table 4 nitriding amount is to the influence of magnetic property
| Embodiment | Nitriding amount (ppm) | B 8(T) | P 17/50(w/kg) |
| 1 | 50 | 1.79 | 1.55 |
| 2 | 90 | 1.88 | 1.37 |
| 3 | 140 | 1.92 | 0.99 |
| 4 | 180 | 1.91 | 1.03 |
| 5 | 200 | 1.89 | 1.15 |
Method of the present invention has effectively solved the problem that traditional high magnetic induction grain-oriented silicon steel production technology exists, and guaranteeing to have reduced energy consumption under the stable prerequisite of product performance, has a good application prospect.
Claims (4)
1. a low temperature slab heats high magnetic induction grain-oriented silicon steel, it is characterized in that the weight percent of composition is:
C:0.035～0.06%, Si:2.5～3.5%, Mn:0.08～1.8%, S:0.005～0.01%, Al:0.015～0.035%, N:0.005～0.009%, Sn:0.01～0.015%, P:0.01～0.03%, Cu:0.05～0.12%, surplus is Fe and inevitable inclusion.
2. the production method of oriented silicon steel described in the claim 1 is characterized in that processing step is as follows:
(1) smelt: with converter or Electric furnace steel making, the molten steel of mentioned component obtains strand behind secondary refining and continuous casting;
(2) hot rolling, strand are heated to 1100～1200 ℃, 1000～1100 ℃ of start rolling temperatures, and finishing temperature is at 850～950 ℃, 550～650 ℃ of the temperature of curling;
(3) normalizing: two-part normalizing annealing, hot-rolled sheet are carried out 1000～1150 ℃, time: 30～150s, and 850～950 ℃, time 30～200s, and cool off fast, cooling rate is not less than 25 ℃/s;
(4) cold rolling: as to adopt the once cold rolling method to roll the finished product thickness of slab, its final draft 83～92%;
(5) decarburizing annealing and nitriding are handled, and the steel band that is rolled down to finished product thickness is carried out being coated with the high temperature annealing separant that MgO is the master after decarburizing annealing and the nitriding processing;
(6) high temperature annealing and smooth annealing: high temperature annealing and smooth annealing process carry out routinely.
3. method according to claim 2 is characterized in that, decarburizing annealing technology comprises:
Dew point: 60～70 ℃, temperature: 810～880 ℃, decarburizing annealing time: 50～150s, decarburizing atmosphere: H
2, N
2Mixed atmosphere, hydrogen ratio 20～80%, percent by volume.
4. method according to claim 2 is characterized in that nitridation process comprises:
Dew point: be not higher than-20 ℃, nitriding temperature: 700～900 ℃, nitriding time: 10～50s, nitriding atmosphere: H
2, N
2, NH
3Mixed atmosphere, hydrogen: 20～80%, ammonia: 0.1～15%, percent by volume; Nitriding amount: 50～300ppm.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255274A (en) * | 2012-08-10 | 2013-08-21 | 新万鑫（福建）精密薄板有限公司 | Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling |
| CN103834908A (en) * | 2012-11-27 | 2014-06-04 | 宝山钢铁股份有限公司 | Production method for improving electromagnetic property of oriented silicon steel |
| CN104018068A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Method for preparing high-magnetic-induction oriented silicon steel with thickness of 0.18mm |
| CN104451378A (en) * | 2014-12-03 | 2015-03-25 | 武汉钢铁(集团)公司 | Oriented silicon steel with excellent magnetic property and production method of oriented silicon steel |
| CN104561795A (en) * | 2014-12-12 | 2015-04-29 | 武汉钢铁(集团)公司 | High magnetic induction grain-oriented silicon steel with B800 being more than or equal to 1.94T and production method thereof |
| CN105177444A (en) * | 2015-11-02 | 2015-12-23 | 武汉钢铁(集团)公司 | Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel |
| CN105714039A (en) * | 2016-05-04 | 2016-06-29 | 华北理工大学 | Annealing process of niobium-containing low-temperature oriented silicon steel and control method thereof |
| CN106755873A (en) * | 2016-11-14 | 2017-05-31 | 武汉钢铁股份有限公司 | A kind of production method of high magnetic induction grain-oriented silicon steel |
| CN107460292A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of processing method for improving low temperature high magnetic induction grain-oriented silicon steel edge performance |
| CN107460293A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN107630186A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of method for improving electrical steel product surface insulation characteristic |
| CN107858494A (en) * | 2017-11-23 | 2018-03-30 | 武汉钢铁有限公司 | The production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN108165876A (en) * | 2017-12-11 | 2018-06-15 | 鞍钢股份有限公司 | A kind of method for improving low temperature nitriding orientation silicon steel surface quality |
| CN113211325A (en) * | 2021-05-07 | 2021-08-06 | 包头市威丰稀土电磁材料股份有限公司 | Method for preparing non-bottom-layer raw material of oriented silicon steel thin strip in physical sand blasting mode |
| CN114107787A (en) * | 2020-08-27 | 2022-03-01 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
| 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 |
| CN115747650A (en) * | 2022-11-14 | 2023-03-07 | 鞍钢股份有限公司 | Low-temperature high-magnetic-induction oriented silicon steel and method for improving magnetic performance stability of low-temperature high-magnetic-induction oriented silicon steel |
| CN116254472A (en) * | 2022-12-08 | 2023-06-13 | 中达连铸技术国家工程研究中心有限责任公司 | Improved low-temperature high-magnetic induction oriented silicon steel and preparation method thereof |
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| CN101348852A (en) * | 2008-09-05 | 2009-01-21 | 首钢总公司 | Method for producing oriented electrical steel by low temperature slab heating |
| CN101768697A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Method for manufacturing oriented silicon steel with one-step cold rolling method |
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Patent Citations (2)
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| CN101348852A (en) * | 2008-09-05 | 2009-01-21 | 首钢总公司 | Method for producing oriented electrical steel by low temperature slab heating |
| CN101768697A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Method for manufacturing oriented silicon steel with one-step cold rolling method |
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| CN103255274A (en) * | 2012-08-10 | 2013-08-21 | 新万鑫（福建）精密薄板有限公司 | Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling |
| CN103255274B (en) * | 2012-08-10 | 2015-06-03 | 新万鑫（福建）精密薄板有限公司 | Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling |
| CN103834908B (en) * | 2012-11-27 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of production method improving electromagnetic performance of oriented silicon steel |
| CN103834908A (en) * | 2012-11-27 | 2014-06-04 | 宝山钢铁股份有限公司 | Production method for improving electromagnetic property of oriented silicon steel |
| CN104018068A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Method for preparing high-magnetic-induction oriented silicon steel with thickness of 0.18mm |
| CN104018068B (en) * | 2014-06-12 | 2017-01-11 | 国家电网公司 | Method for preparing high-magnetic-induction oriented silicon steel with thickness of 0.18mm |
| CN104451378A (en) * | 2014-12-03 | 2015-03-25 | 武汉钢铁(集团)公司 | Oriented silicon steel with excellent magnetic property and production method of oriented silicon steel |
| CN104451378B (en) * | 2014-12-03 | 2017-11-03 | 武汉钢铁(集团)公司 | A kind of orientation silicon steel having excellent magnetic characteristics and production method |
| CN104561795A (en) * | 2014-12-12 | 2015-04-29 | 武汉钢铁(集团)公司 | High magnetic induction grain-oriented silicon steel with B800 being more than or equal to 1.94T and production method thereof |
| CN105177444A (en) * | 2015-11-02 | 2015-12-23 | 武汉钢铁(集团)公司 | Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel |
| CN105177444B (en) * | 2015-11-02 | 2017-03-22 | 武汉钢铁(集团)公司 | Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel |
| CN105714039A (en) * | 2016-05-04 | 2016-06-29 | 华北理工大学 | Annealing process of niobium-containing low-temperature oriented silicon steel and control method thereof |
| CN107630186A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of method for improving electrical steel product surface insulation characteristic |
| CN106755873A (en) * | 2016-11-14 | 2017-05-31 | 武汉钢铁股份有限公司 | A kind of production method of high magnetic induction grain-oriented silicon steel |
| CN107460293A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN107460293B (en) * | 2017-08-04 | 2018-10-16 | 北京首钢股份有限公司 | A kind of production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN107460292A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of processing method for improving low temperature high magnetic induction grain-oriented silicon steel edge performance |
| CN107858494A (en) * | 2017-11-23 | 2018-03-30 | 武汉钢铁有限公司 | The production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN107858494B (en) * | 2017-11-23 | 2019-07-16 | 武汉钢铁有限公司 | The production method of low temperature high magnetic induction grain-oriented silicon steel |
| CN108165876A (en) * | 2017-12-11 | 2018-06-15 | 鞍钢股份有限公司 | A kind of method for improving low temperature nitriding orientation silicon steel surface quality |
| CN108165876B (en) * | 2017-12-11 | 2020-09-01 | 鞍钢股份有限公司 | Method for improving surface quality of low-temperature nitriding oriented silicon steel |
| CN114107787A (en) * | 2020-08-27 | 2022-03-01 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
| CN113211325A (en) * | 2021-05-07 | 2021-08-06 | 包头市威丰稀土电磁材料股份有限公司 | Method for preparing non-bottom-layer raw material of oriented silicon steel thin strip in physical sand blasting mode |
| CN113211325B (en) * | 2021-05-07 | 2022-07-12 | 包头市威丰稀土电磁材料股份有限公司 | Method for preparing non-bottom-layer raw material of oriented silicon steel thin strip in physical sand blasting mode |
| 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 |
| CN115747650A (en) * | 2022-11-14 | 2023-03-07 | 鞍钢股份有限公司 | Low-temperature high-magnetic-induction oriented silicon steel and method for improving magnetic performance stability of low-temperature high-magnetic-induction oriented silicon steel |
| CN115747650B (en) * | 2022-11-14 | 2023-08-18 | 鞍钢股份有限公司 | Low-temperature high-magnetic-induction oriented silicon steel and method for improving magnetic property stability of low-temperature high-magnetic-induction oriented silicon steel |
| CN116254472A (en) * | 2022-12-08 | 2023-06-13 | 中达连铸技术国家工程研究中心有限责任公司 | Improved low-temperature high-magnetic induction oriented silicon steel and preparation method thereof |
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Application publication date: 20110720 |