CN102274936B - Method for manufacturing non-oriented silicon steel plate based on twin-roll thin strip continuous casting technology - Google Patents
Method for manufacturing non-oriented silicon steel plate based on twin-roll thin strip continuous casting technology Download PDFInfo
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Abstract
The invention relates to the technical field of metallurgical technology, in particular to a method for manufacturing a non-oriented silicon steel plate based on a twin-roll thin strip continuous casting technology. The method comprises the steps of: smelting molten steel with the silicon content of 2.9-3.5wt% at a temperature of 1610-1720 DEG C; pouring the molten steel in a tundish, wherein the molten steel flows into a cavity formed by two crystallizing rolls which rotate at a linear velocity of 20-60m/min and a side-closing plate through the tundish, and is in contact with the crystallizing rolls to generate a solidified shell, and a cast band is led out of the crystallizing rolls; obtaining a cast band coil after the cast band is subjected to the online side-shearing treatment and coiling; warm-rolling the cast band coil after the cast band coil is cooled down to 200-600 DEG C in air, wherein the amount of deformation in warm-rolling is 5-30 percent; and cold-rolling, annealing and coating the warm-rolled cast band coil to prepare a non-oriented silicon steel plate. The method provided by the invention has the advantages that the process is simple and compact, energy is saved, consumption is reduced, microscopic structures of the cast band can be effectively controlled, the drawability, the plate shape and the surface quality of the cast band can be improved, and the magnetic induction intensity of the non-oriented silicon steel plate can be effectively increased.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of manufacture method of the orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology.
Background technology
Orientation free silicon steel plate uses mainly as the core material of various motors.Energy loss when reducing motor rotation must further be improved the magnetic property of orientation free silicon steel plate, and wherein, magnetic induction intensity is one of key index of orientation free silicon steel plate magnetic property.Improve the magnetic induction intensity of orientation free silicon steel plate, exciting curent reduction, iron loss and the copper loss of iron core are all descended, save electric energy.When power of motor is constant, improve magnetic induction intensity, can improve the maximum magnetic induction of design, it is long-pending to dwindle core section, make that core volume reduces, weight saving, and save orientation free silicon steel plate, wire, insulating materials and structural material consumption, thereby can reduce total losses and the manufacturing cost of motor, and be conducive to manufacturing, installation and the transportation of large motor.
The key that improves orientation free silicon steel plate magnetic induction intensity be obtain satisfied 001}＜0vw〉texture.The production procedure of existing orientation free silicon steel plate is: there are the problems such as equipment investment is large, complex process, energy consumption is large, carrying capacity of environment is large in smelting → continuous casting → heating → hot rolling → (normalizing processing) → pickling → cold rolling → (intermediate annealing) → (the critical strain amount is cold rolling) → finished products → be coated with insulating barrier → shearing, packing.In addition, when utilizing existing production procedure to make orientation free silicon steel plate, in the finished products process, usually preferential form flourishing 111}＜uvw〉texture, seriously hindered 001}＜0vw〉formation of texture, magnetic induction intensity is reduced.The magnetic induction density B of the orientation free silicon steel plate of the about 3wt% of silicon content that existing production procedure is made
50Only between 1.66～1.68T, more and more be difficult to satisfy the requirement of efficient core material.
To be a kind of crystallization roll that utilizes two rotations become liquid metal direct pouring strip, can save the nearly end form forming technique of short flow process of high-temperature heating and hot-rolled process twin-roll thin strip continuous casting, has the advantages such as energy-saving and environmental protection, low cost.Twin-roll thin strip continuous casting has the characteristics with the molten steel rapid solidification, and it is up to 10
2～10
4℃/cooling velocity of s is far longer than the cooling velocity of conventional continuous casting heavy slab.Utilize the crystallization roll of two rotations to realize two-sided directional solidification to molten steel to a certain extent, can obtain to have flourishing column crystal solidified structure and 001}＜0vw〉the non-orientation silicon steel Cast Strip of texture, improve the magnetic induction intensity of production board.
The average grain size of the non-orientation silicon steel Cast Strip that the twin-roll thin strip continuous casting method is produced is 100～500 μ m, is far longer than the crystallite dimension of the hot rolled plate of old process.And the crystal defect of Cast Strip is many, and plasticity and plate shape are all relatively poor, the direct cold rolling difficulty.The patent of the twin-roll thin strip continuous casting non-orientation silicon steel of Japanese kokai publication hei 6-31395 discloses a kind of by apply about 100Kg/mm at crystallization roll
2Pressure and improve the method for Cast Strip toughness, the crystal defect of Cast Strip reduces although the method makes, toughness improves, because the Cast Strip temperature of just having solidified is all more than 1400 ℃, intensity is low, plasticity is poor, improves casting-rolling force and is easy to cause the surface, Cast Strip to produce transverse crack, affects the carrying out of follow-up rolling mill practice.Chinese patent 02112304.7 discloses the production method of the Cast Strip being carried out behind a kind of double roller continuous casting the non-orientation silicon steel of on-line continuous hot rolling, although the method can be improved the toughness of Cast Strip and the magnetic property of production board, but because the Cast Strip exists overlap, edge thickening, limit section defects i.e.cracks usually, it is very large that on-line continuous hot rolling difficulty is carried out in the Cast Strip, and the plate shape of hot rolled plate, thickness, surface quality are wayward.
Summary of the invention
The manufacture method that the purpose of this invention is to provide a kind of orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology, the microscopic structure of control Cast Strip is improved plasticity, plate shape and the surface quality of Cast Strip, simultaneously the magnetic induction intensity of Effective Raise orientation free silicon steel plate.
The technical scheme that realizes the object of the invention is:
The temperature of smelting good molten steel is controlled between 1610～1720 ℃, it is cast in the tundish, molten steel is in the diameter that tundish flows into two rotations is the crystallization roll of 500～1000mm and cavity that side seal board forms, form the molten bath, molten steel contacts with crystallization roll scull occurs, deriving thickness from crystallization roll is 1～5mm, width is the Cast Strip of 100～2000mm, batch after the online processing of cutting edge the Cast Strip, then the Cast Strip is twisted in and carry out warm-rolling after being cooled to 200～600 ℃ in the air, carry out again cold rolling, annealing and coating and process and obtain the non-orientation silicon steel panel products.
The linear velocity of described two crystallization rolls rotation is 20～60m/min.
The deflection of described warm-rolling process is 5%～30%.
The annealing temperature of described annealing in process is 1000～1150 ℃, and annealing time is 0.5～3min.
The composition of described molten steel is: C(0.002～0.01) wt%, Si(2.9～3.5) wt%, Mn(0.1～0.3) wt%, Al(0.2～1.0) wt%, S＜0.005wt%, P＜0.02wt%, N＜0.005wt%, surplus is Fe element and inevitable impurity.
Described coating treatment process is common process.
Pouring molten steel need be controlled the temperature of molten steel in tundish the time, the excess Temperature of molten steel is easy to cause the bleed-out accident; The temperature of molten steel is excessively low, is easy to cause the card accident of rolling.
In the casting process, the rotating speed of crystallization roll is too fast or cross and all can the stability of casting process be impacted slowly.
Warm-rolling is carried out after twisting in and must being cooled to 200～600 ℃ in the air in the Cast Strip, if temperature is excessively low, the plasticity of Cast Strip is relatively poor, is easy to occur crackle in the operation of rolling.If excess Temperature, the Cast Strip surface oxidation is serious, has increased the weight of the load of follow-up operation.The purpose of the Cast Strip being carried out warm-rolling is to improve the plasticity of Cast Strip, plate shape and surface quality, for follow-up cold rolling process ready.
The invention has the beneficial effects as follows:
(1) the present invention processes by the Cast Strip volume of air cooling to the design temperature directly carried out warm-rolling, save conventional Cast Strip and rolled up again heating process and hot-rolled process, refinement the Cast Strip tissue, improved plasticity, plate shape and the surface quality of Cast Strip, be the cold rolling condition of providing convenience;
(2) the present invention has realized effective control to the Cast Strip microscopic structure by the regulation and control to the pouring temperature of molten steel, crystallization roll rotating speed, obtained to have flourishing column crystal solidified structure and 001}＜0vw〉the non-orientation silicon steel Cast Strip of texture, thereby the magnetic induction intensity of Effective Raise orientation free silicon steel plate;
(3) manufacturing process of the present invention is simple, compact, and is energy-saving and cost-reducing.
Description of drawings
The process flow diagram of Fig. 1 preparation orientation free silicon steel plate of the present invention, wherein:
1: the intermediate frequency vaccum sensitive stove; 2: tundish; 3: crystallization roll; 4: the molten bath; 5: the Cast Strip; 6: gas-mist cooling device; 7: circle shear; 8: coiling machine; 9: the Cast Strip volume; 10: the warm-rolling machine; 11: cold-rolling mill; 12: annealing coating unit;
The micro-organization chart of the longitudinal section of the non-orientation silicon steel Cast Strip of Fig. 2 embodiment of the invention 1 preparation;
The micro-organization chart of the non-orientation silicon steel production board of Fig. 3 embodiment of the invention 1 preparation;
Marcotexture figure (the φ of the non-orientation silicon steel production board of Fig. 4 embodiment of the invention 1 preparation
2=45 °).
The specific embodiment
The technical process for preparing orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology of the present invention as shown in Figure 1.Its technical process is: pour in the tundish 2 after the molten steel in the intermediate frequency vaccum sensitive stove 1 reaches design temperature, molten steel in the tundish 2 flow in the cavity that crystallization roll 3 and side seal board by two rotations form again and form molten bath 4, molten steel in the molten bath 4 contacts and forms scull with crystallization roll 3, along with the metal heat is constantly derived by crystallization roll 3, molten steel continues to solidify, form Cast Strip 5, Cast Strip 5 is after gas-mist cooling device 6 coolings, cut edge through circle shear 7, obtain Cast Strip volume 9 after being batched by coiling machine 8, the Cast Strip twists in and is cooled to design temperature in the air by warm-rolling machine 10 warm-rollings, cold rolling through cold-rolling mill 11 again, finish annealing and the coating processing obtains orientation free silicon steel plate finally by annealing coating unit 12.
Embodiment 1
Utilize intermediate frequency vacuum induction furnace smelting composition to be: C 0.0037wt%, Si 3.23wt%, Mn 0.22wt%, P 0.006wt%, S0.0028wt%, N 0.0033wt%, Al 0.71wt%, surplus is the molten steel of Fe and impurity, and the control liquid steel temperature is 1650 ℃, and it is poured into tundish, molten steel forms the molten bath in tundish flows into two cavitys that form with crystallization roll and the side seal board of linear velocity 40m/min rotation, molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is 2.0mm, and width is the Cast Strip of 250mm, batch after the online processing of cutting edge the Cast Strip, then the Cast Strip is twisted in and carry out warm-rolling after being cooled to 400 ℃ in the air, the warm-rolling deflection is 10%, after pickling, it is cold rolling again row to be involved in the Cast Strip behind the warm-rolling, obtain the thick cold-reduced sheet of 0.50mm, the 2min that again cold-reduced sheet annealed under 1100 ℃ of conditions obtains the non-orientation silicon steel panel products after coating.
The microscopic structure of the longitudinal section of the non-orientation silicon steel Cast Strip of present embodiment preparation is seen Fig. 2, and as can be seen from Figure 2 the inventive method preparation has flourishing columanar structure without the oriented steel Cast Strip; The microscopic structure of the non-orientation silicon steel production board of present embodiment preparation is seen Fig. 3, and as can be seen from Figure 3 the non-orientation silicon steel production board of the inventive method preparation is the perfect recrystallization tissue; Marcotexture (the φ of the non-orientation silicon steel production board of present embodiment preparation
2=45 °) see Fig. 4, as can be seen from Figure 4 the non-orientation silicon steel production board of the inventive method preparation have stronger 001}＜100〉cubic texture.The horizontal stroke of the non-orientation silicon steel production board of the present invention's preparation, vertical average magnetic induction intensity B
50=1.71T is than the high 0.03～0.05T of magnetic induction intensity of the orientation free silicon steel plate of conventional method preparation.
Embodiment 2
Utilize intermediate frequency vacuum induction furnace smelting composition to be: C 0.002wt%, Si 3.5wt%, Mn 0.3wt%, P 0.009wt%, S0.0048wt%, N 0.0029wt%, Al 0.2wt%, surplus is the molten steel of Fe and impurity, and the control liquid steel temperature is 1610 ℃, and it is poured into tundish, molten steel forms the molten bath in tundish flows into two cavitys that form with crystallization roll and the side seal board of linear velocity 60m/min rotation, molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is 1.0mm, and width is the Cast Strip of 100mm, batch after the online processing of cutting edge the Cast Strip, then the Cast Strip is twisted in and carry out warm-rolling after being cooled to 600 ℃ in the air, the warm-rolling deflection is 30%, after pickling, it is cold rolling again row to be involved in the Cast Strip behind the warm-rolling, obtain the thick cold-reduced sheet of 0.50mm, the 3min that again cold-reduced sheet annealed under 1000 ℃ of conditions obtains the non-orientation silicon steel panel products after coating.The horizontal stroke of the non-orientation silicon steel production board of the present invention's preparation, vertical average magnetic induction intensity B
50=1.71T is than the high 0.03～0.05T of magnetic induction intensity of the orientation free silicon steel plate of conventional method preparation.
Utilize intermediate frequency vacuum induction furnace smelting composition to be: C 0.01wt%, Si 2.9wt%, Mn 0.1wt%, P 0.018wt%, S0.0035wt%, N 0.0044wt%, Al 1.0wt%, surplus is the molten steel of Fe and impurity, and the control liquid steel temperature is 1720 ℃, and it is poured into tundish, molten steel forms the molten bath in tundish flows into two cavitys that form with crystallization roll and the side seal board of linear velocity 20m/min rotation, molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is 5.0mm, and width is the Cast Strip of 2000mm, batch after processing through cutting edge the Cast Strip, then the Cast Strip is twisted in and carry out warm-rolling after being cooled to 200 ℃ in the air, the warm-rolling deflection is 5%, after pickling, it is cold rolling again row to be involved in the Cast Strip behind the warm-rolling, obtain the thick cold-reduced sheet of 0.50mm, the 0.5min that again cold-reduced sheet annealed under 1150 ℃ of conditions obtains the non-orientation silicon steel panel products after coating.The horizontal stroke of the non-orientation silicon steel production board of the present invention's preparation, vertical average magnetic induction intensity B
50=1.71T is than the high 0.03～0.05T of magnetic induction intensity of the orientation free silicon steel plate of conventional method preparation.
Claims (4)
1. manufacture method based on the orientation free silicon steel plate of twin-roll thin strip continuous casting technology, the temperature of smelting good molten steel is controlled between 1610～1720 ℃, it is cast in the tundish, molten steel is in the diameter that tundish flows into two rotations is the crystallization roll of 500～1000mm and cavity that side seal board forms, form the molten bath, molten steel contacts with crystallization roll scull occurs, deriving thickness from crystallization roll is 1～5mm, width is the Cast Strip of 100～2000mm, it is characterized in that: batch after the online processing of cutting edge the Cast Strip, then the Cast Strip is twisted in and carry out warm-rolling after being cooled to 200～600 ℃ in the air, carry out again cold rolling, annealing and coating are processed and are obtained the non-orientation silicon steel panel products.
2. the manufacture method of a kind of orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology according to claim 1 is characterized in that the linear velocity of described two crystallization rolls rotation is 20～60m/min.
3. the manufacture method of a kind of orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology according to claim 1, the deflection that it is characterized in that described warm-rolling process is 5%～30%.
4. the manufacture method of a kind of orientation free silicon steel plate based on the twin-roll thin strip continuous casting technology according to claim 1, the annealing temperature that it is characterized in that described annealing in process is 1000～1150 ℃, annealing time is 0.5～3min.
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| CN102936644B (en) * | 2012-11-28 | 2014-06-25 | 东北大学 | Method for improving magnetic property of twin roll strip casting non-oriented electrical steel |
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| CN104805351B (en) * | 2015-04-23 | 2017-10-24 | 东北大学 | A kind of ultra-fine grain high-silicon electrical steel thin plate and its manufacture method |
| CN105436204B (en) * | 2016-01-10 | 2017-08-08 | 东北大学 | The rolling device and its method of a kind of high silicon steel |
| CN108085603B (en) * | 2018-01-29 | 2019-09-27 | 东北大学 | A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting |
| CN109877283B (en) * | 2018-06-08 | 2021-04-23 | 江苏沙钢集团有限公司 | Low-cost iron core material and production method thereof |
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