CN102560236B - Preparation method of common oriented silicon steel - Google Patents
Preparation method of common oriented silicon steel Download PDFInfo
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- CN102560236B CN102560236B CN 201010597255 CN201010597255A CN102560236B CN 102560236 B CN102560236 B CN 102560236B CN 201010597255 CN201010597255 CN 201010597255 CN 201010597255 A CN201010597255 A CN 201010597255A CN 102560236 B CN102560236 B CN 102560236B
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Abstract
The invention discloses a preparation method of common oriented silicon steel. The preparation method is characterized by comprising the following process flows: smelting, continuous casting, hot rolling, acid washing, cold continuous rolling, normalizing, reversible cold rolling, decarburizing, annealing and MgO coating, high-temperature annealing and hot tension leveling and coating of an insulating layer. According to the invention, a hot-rolled plate is pretreated by adopting a cold continuous rolling mode so as to improve the structure of the hot-rolled plate; the pretreatment of the hot-rolled plate is matched with the normalizing process so that the magnetic property of a product is improved, the iron loss P 1.7 is averagely reduced by 0.1W/kg, and the magnetic induction B8 is averagely improved by 0.08T.
Description
Technical field
The present invention relates to the ferrous metallurgy field, relate in particular to a kind of preparation method of common orientation silicon steel.
Background technology
Being described as the oriented silicon steel of " artwork " in the steel products, being celebrated with complicated process of preparation so that its process window is narrow, is non-retentive alloy important in electric power, the electronic industry.
The preparation method of tradition directed silicon steel is heavy reduction rate cold-rolling practice (HiB steel) and the medium draft cold-rolling practice of secondary (GO steel) once.According to the difference of continuous blank heating temperature, be divided into heat method and low-temperature heat method again.Wherein, the most general with the heat method, for common magnetic induction grain-oriented silicon steel (GO steel), adopt MnS as main inhibitor, in the fully solid solution in strand of hot-rolled high heating MnS particle,, and serve as the inhibitor of Gauss's crystal grain generation secondary recrystallization in the secondary recrystallization process separating out of hot rolled finish rolling stage even dispersion, make Gauss's crystal grain that secondary recrystallization can take place smoothly, thereby obtain good magnetic performance.And in recent years, low-temperature oriented silicon steel technology of preparing develops rapidly, mainly be Sization thing with Cu as main inhibitor because its solid solubility temperature is lower than MnS particle, can reduce the Heating temperature of slab, thus save energy.And no matter adopt pyroprocess still is that low temperature process is prepared, it all is evolution process at the control goss texture, and tradition thinks that Gauss's crystal grain originates from the inferior top layer of hot-rolled sheet, after cold rolling, be present in the transitional zone of cold-reduced sheet, when high temperature annealing owing to there is the effect of inhibitor, with the favourable orientation relationship of crystal grain existence around it secondary recrystallization takes place in addition and form single goss texture.
Based on this principle; if can control the TEXTURE STATE on hot-rolled sheet time top layer well; when cold rolling, produce more slip band and dislocation defects; separating out for the disperse of the second phase particle in the follow-up normalizing process provides more nucleation site; make separating out of its even dispersion; help in high-temperature annealing process forming the position to single Goss texture accurately, will improve the magnetic property of product.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; technical problem to be solved by this invention provides a kind of novel process for preparing common orientation silicon steel; by a cold continuous rolling before the normalizing hot-rolled sheet is organized pre-treatment, thereby improve product magnetic property and production efficiency, reach energy-saving and cost-reducing.
Technical scheme of the present invention is:
1, technical process
Smelting → continuous casting → hot rolling → pickling → cold continuous rolling → normalizing → reversible is cold rolling → decarburizing annealing and to be coated with MgO → high temperature annealing → thermal stretch smooth and be coated with insulation layer.
2, processing parameter
(1) composition
Oriented silicon steel of the present invention is smelted composition and is seen Table 1.
Table 1 oriented silicon steel composition (wt%)
| C | Si | Mn | P | S | Als | N | Fe |
| 0.035～0.055 | 2.8～3.4 | 0.5～1.0 | 0.005～0.02 | 0.015～0.03 | 0.01～0.03 | 0.006～0.010 | Surplus |
(2) hot rolling
The hot rolling raw material is the continuous casting steel billet of 200～250mm, is heated to 1200～1300 ℃ in process furnace, and insulation 120～180min is through the hot-rolled sheet coil of hot rolling acquisition 2.0～2.8mm thickness.The hot-rolled temperature system sees Table 2.
Table 2 hot-rolled temperature system (℃)
| RT2 | FET | FDT | CT |
| 1050～1100 | 1030～1080 | 850～950 | 500～700 |
(3) cold continuous rolling
Adopt 1500 pickling continuous rolling production lines of complete 6 rollers of 5 frames to carry out cold rolling.The finish to gauge gauge control is at 1.0～1.6mm, and percentage pass reduction reduces successively, and total draft is 30%～60%.Adopt hydrochloric acid turbulent flow pickling technology to carry out pickling before cold rolling, the concentration of hydrochloric acid is: 30～170g/l, acid liquor temperature is: 70～85 ℃.
Before handling, normalizing adopt the cold continuous rolling of medium draft less than normal that hot-rolled sheet is carried out pre-treatment, purpose has two: the one, produce successive shearing strain on the hot-rolled sheet top layer, with hot-rolled sheet top layer and time comparatively thick equiax crystal fragmentation in top layer, in the normalizing treating processes, produce more multidigit to Gauss's nucleus accurately; The 2nd, through the hot-rolled sheet after the cold continuous rolling processing; can produce a large amount of dislocation defects; handle separating out of the cooling section AlN second phase particle for normalizing more nucleation site is provided; the small and dispersed more that it is separated out; to increase the inhibition ability in the secondary recrystallization process; the Gauss position that makes subgrain is to more accurate, thus the magnetic property of raising product.
(4) normalizing
Hot-rolled sheet through cold continuous rolling is handled in the normalizing that the normalizing unit carries out 1050～1150 ℃ of insulation 2～5min.During cooling, steel plate is incubated 30～60s under 850～930 ℃ of conditions, adopts 60～100 ℃ water spray steel plate upper and lower surface again, make steel billet temperature be reduced to about 100 ℃ rapidly, utilize then air-cooled steel billet temperature to be reduced to 30～50 ℃, after pickling, batch again.
(5) reversible cold rolling
Adopt single chassis 6 roll reversing rollers or 20 roller Sendzimir reversable mills, the normalizing plate is carried out the reversible rolling of 3～5 passages, the percentage pass reduction evenly distribute, total draft is 70%～85%, the secondary cold-rolling plate thickness is 0.23～0.30mm.
(6) decarburizing annealing and be coated with MgO
Adopt continuous annealing furnace to carry out decarburizing annealing, soaking time is 2～5min, and dew point is set at 30 ℃～60 ℃, and annealing temperature is 800～870 ℃, and the protective atmosphere proportioning is 15～25%H
2+ N
2, the control kiln temperatures will be batched after the MgO coated and dried at 400～650 ℃.
(7) high-temperature annealing process
Adopt bell furnace or ring furnace to carry out high temperature annealing, in 1～2h, be warmed up to 650 ℃, insulation 20～30h, the heat-up rate with 15～40 ℃/h is raised to 1200 ℃ again, and insulation 20～40h comes out of the stove when cooling to below 300 ℃ with stove.
The high temperature annealing plate through thermal stretch smooth and be coated with insulation layer after carry out the detection of magnetic property and surface quality, detect and send into stockyard after qualified.
The present invention adopts the cold continuous rolling mode that hot-rolled sheet is carried out pre-treatment, improves the hot-rolled sheet tissue; The hot-rolled sheet pre-treatment cooperates with normalizing process, improves the product magnetic property, iron loss P
1.7Average 0.1W/kg, the magnetic strength B of reducing
8The average 0.08T that improves.
Description of drawings
Fig. 1 is embodiment 1 high-temperature annealing process system figure;
Fig. 2 is embodiment 2 high-temperature annealing process system figure.
Embodiment
The present invention is further described below in conjunction with embodiment:
Embodiment 1:
1, composition
The composition of present embodiment oriented silicon steel sees Table 3.
The composition of table 3 oriented silicon steel (wt%)
| C | Si | Mn | P | S | Als | N | Fe |
| 0.035 | 2.8 | 0.5 | 0.02 | 0.015 | 0.01 | 0.006 | Surplus |
2, smelting and continuous casting
Through converter smelting, after the RH refining, it is the continuously cast bloom of 200mm that continuous casting becomes thickness.
3, hot rolling
Continuously cast bloom through roughing and finish rolling, is rolled into the hot-rolled sheet that thickness is 2.2mm behind 1225 ℃ of heating 140min.Its rolling temperature system sees Table 4.
Table 4 hot-rolled temperature system (℃)
| RT2 | FET | FDT | CT |
| 1050 | 1030 | 850 | 500 |
4, cold continuous rolling
Adopt hydrochloric acid turbulent flow pickling technology to carry out pickling before cold rolling, concentration is 110g/l, and acid liquor temperature is 75 ℃.Hot-rolled sheet is behind 5 passage cold continuous rollings, and thickness is 1.1mm, and percentage pass reduction reduces (17% → 15% → 13% → 11% → 9%) successively, and rolling total draft is 50%.
5, normalizing
The Heating temperature of normalizing is 1150 ℃, and soaking time is 2min, and at 930 ℃ of insulation 40s, the shrend temperature is 60 ℃, after pickling, batches when steel plate is cooled to below 50 ℃ during cooling.
6, reversible cold rolling
It is reversible cold rolling to adopt 20 roller sendzimir mills to carry out secondary, will be 0.23mm through the reversible thickness that is cold rolled to of 4 passages after the normalizing and through the steel plate of overpickling, the percentage pass reduction evenly distribute, and on average every time draft is 32.5%, total draft is 79%.
7, decarburizing annealing and be coated with MgO
Adopt continuous annealing furnace to carry out decarburizing annealing, soaking time is 3.5min, and dew point is set at 35 ℃, and annealing temperature is 860 ℃, and the protective atmosphere proportioning is 25%H
2+ 75%N
2, the control kiln temperatures will be batched after the MgO oven dry at 450 ℃.
8, high temperature annealing
The high-temperature annealing process system is seen Fig. 1.
9, magnetic property detects
Select the sample of traditional technology preparation and the sample of the present invention's preparation, carry out magnetic property respectively and detect.Detected result sees Table 5.Lumber recovery and the production time estimated under two kinds of technology see Table 6.As can be seen from Table 5, adopt the oriented silicon steel magnetic property of the inventive method preparation significantly better than traditional method (improving 1 trade mark); As can be seen from Table 6, adopt method of the present invention to produce oriented silicon steel, its average lumber recovery is higher than traditional method, and the used production time much smaller than traditional method, improved production efficiency.
Table 5 magnetic property
| Project | P 1.7(W/kg) | B 8(T) |
| Traditional C GO method | 1.37 | 1.79 |
| The present invention | 1.23 | 1.84 |
Average lumber recovery of table 6 and production time
Embodiment 2:
1, composition
The composition of present embodiment oriented silicon steel sees Table 7.
The composition of table 7 oriented silicon steel (wt%)
| C | Si | Mn | P | S | Als | N | Fe |
| 0.055 | 3.4 | 1.0 | 0.005 | 0.03 | 0.03 | 0.010 | Surplus |
2, smelting and continuous casting
Through converter smelting, after the RH refining, it is the continuously cast bloom of 240mm that continuous casting becomes thickness.
3, hot rolling
Continuously cast bloom through roughing and finish rolling, is rolled into the hot-rolled sheet that thickness is 2.5mm behind 1290 ℃ of heating 180min.Its rolling temperature system sees Table 8.
Table 8 hot-rolled temperature system (℃)
| RT2 | FET | FDT | CT |
| 1100 | 1080 | 950 | 700 |
4, cold continuous rolling
Adopt hydrochloric acid turbulent flow pickling technology to carry out pickling before cold rolling, the concentration of hydrochloric acid is 90g/l, and acid liquor temperature is 75 ℃.Hot-rolled sheet is behind 5 passage cold continuous rollings, and thickness is 1.5mm, and percentage pass reduction is followed successively by 12% → 11% → 10% → 9% → 6%, and rolling total draft is 40%.
5, normalizing
The Heating temperature of normalizing is 1100 ℃, and soaking time is 4min, and steel plate is at 880 ℃ of insulation 50s during cooling, and the shrend temperature is 90 ℃, after pickling, batches when steel plate is cooled to below 40 ℃.
6, reversible cold rolling
It is reversible cold rolling to adopt single chassis 6 roller mills to carry out, with after the normalizing and to be cold rolled to thickness through the steel plate of overpickling through 4 passages be 0.30mm, and the percentage pass reduction evenly distribute, every time draft is 33%, total draft is 80%.
7, decarburizing annealing and be coated with MgO
Adopt continuous annealing furnace to carry out decarburizing annealing, soaking time is 5min, and dew point is set at 55 ℃, and annealing temperature is 850 ℃, and the protective atmosphere proportioning is 20%H
2+ 80%N
2, the control kiln temperatures will be batched after the MgO coated and dried at 650 ℃.
8, high temperature annealing
The high-temperature annealing process system is seen Fig. 2.
9, magnetic property detects
Select the sample of traditional technology preparation and the sample of the present invention's preparation, carry out magnetic property respectively and detect.Detected result sees Table 9.Lumber recovery and the production time estimated under two kinds of technology see Table 10.As can be seen, according to the contrast of magnetic property, finished product rate and production efficiency data, the inventive method has not only improved the magnetic property and the lumber recovery of product, and obviously enhances productivity from table 9 and table 10.
Table 9 magnetic property
| Project | P 1.7(W/kg) | B 8(T) |
| Traditional C GO method | 1.40 | 1.79 |
| The present invention | 1.28 | 1.86 |
Average lumber recovery of table 10 and production time
Claims (4)
1. the preparation method of a common orientation silicon steel is characterized in that: technical process for smelting → continuous casting → hot rolling → pickling → cold continuous rolling → normalizing → reversible cold rolling → decarburizing annealing and to be coated with MgO → high temperature annealing → thermal stretch smooth and be coated with insulation layer; Smelting composition is C 0.035 ~ 0.055 by weight percentage, and Si 2.8 ~ 3.4, Mn0.5 ~ 1.0, and P 0.005 ~ 0.02, and S 0.015 ~ 0.03, and Als 0.01 ~ 0.03, and N 0.006 ~ 0.010, and surplus is Fe and inevitable impurity; The finish to gauge gauge control is at 1.0 ~ 1.6mm during described cold continuous rolling, and percentage pass reduction reduces successively, and total draft is 30% ~ 60%; Described normalizing is the normalizing processing of carrying out 1050 ~ 1150 ℃ of insulation 2 ~ 5min at the normalizing unit, during cooling, steel plate is incubated 30 ~ 60s under 850 ~ 930 ℃ of conditions, adopt 60 ~ 100 ℃ water spray steel plate upper and lower surface again, steel billet temperature is reduced to rapidly below 100 ℃, utilize then air-cooled steel billet temperature to be reduced to 30 ~ 50 ℃, after pickling, batch again; Described reversible cold rolling be the reversible rolling that the normalizing plate is carried out 3 ~ 5 passages, the percentage pass reduction evenly distribute, total draft is 70% ~ 85%, the secondary cold-rolling plate thickness is 0.23 ~ 0.30mm.
2. according to the preparation method of the described a kind of common orientation silicon steel of claim 1, it is characterized in that: described hot rolling raw material is the continuous casting steel billet of 200 ~ 250mm, be heated to 1200 ~ 1300 ℃ in process furnace, insulation 120 ~ 180min is through the hot-rolled sheet coil of hot rolling acquisition 2.0 ~ 2.8mm thickness.
3. according to the preparation method of the described a kind of common orientation silicon steel of claim 1; it is characterized in that: carry out decarburizing annealing at continuous annealing furnace, soaking time is 2 ~ 5min, and dew point is set at 30 ℃ ~ 60 ℃; annealing temperature is 800 ~ 870 ℃, and the protective atmosphere proportioning is 15% ~ 25%H
2+ 85% ~ 75%N
2, the control kiln temperatures will be batched after the MgO coated and dried at 400 ~ 650 ℃.
4. according to the preparation method of the described a kind of common orientation silicon steel of claim 1, it is characterized in that: adopt bell furnace or ring furnace to carry out high temperature annealing, in 1 ~ 2h, be warmed up to 650 ℃, insulation 20 ~ 30h, heat-up rate with 15 ~ 40 ℃/h is raised to 1200 ℃ again, insulation 20 ~ 40h comes out of the stove when cooling to below 300 ℃ with stove.
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| CN110369500A (en) * | 2019-07-09 | 2019-10-25 | 鞍钢股份有限公司 | A kind of disconnected band control method of oriented silicon steel cold-rolled |
| CN114645202B (en) * | 2022-03-14 | 2023-05-05 | 安阳钢铁集团有限责任公司 | Method for obtaining high-orientation-degree GOSS texture Fe-3% Si material |
| CN116460139B (en) * | 2023-03-23 | 2024-01-02 | 首钢智新迁安电磁材料有限公司 | Ultrathin high-magnetic-induction oriented silicon steel and rolling method thereof |
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| CN100381598C (en) * | 2004-12-27 | 2008-04-16 | 宝山钢铁股份有限公司 | Orientating silicon steel, manufacturing process and equipment |
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