CN103484643B - Method for preventing hot rolling edge fractures in oriented silicon steel - Google Patents
Method for preventing hot rolling edge fractures in oriented silicon steel Download PDFInfo
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- CN103484643B CN103484643B CN201310370463.2A CN201310370463A CN103484643B CN 103484643 B CN103484643 B CN 103484643B CN 201310370463 A CN201310370463 A CN 201310370463A CN 103484643 B CN103484643 B CN 103484643B
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Abstract
The invention belongs to the field of preparation techniques of oriented silicon steel, and particularly relates to a method for preventing hot rolling edge fractures in oriented silicon steel. The method comprises the step of temperature control in a heating furnace heating and rolling process, including temperature of the oriented silicon steel plate blank before the corner enters the heating furnace, preheating section temperature and first heating section temperature in the heating furnace, and precision rolling inlet temperature and precision rolling finishing temperature. By controlling the corner temperature of the plate blank entering the furnace and the first heating section temperature, the method reduces the thermal stress when heating the corner, and avoids generating internal fractures; and by controlling the precision rolling inlet and finishing temperatures of the continuous rolling mill train and reasonably setting the tension among the machine frames, the method avoids generating the hot rolling edge fractures.
Description
Technical field
The invention belongs to the preparation technology field of oriented silicon steel, particularly relate to a kind of method preventing oriented silicon steel hot-rolling edge cracking.
Background technology
cold rolled silicon steel, particularly the manufacturing process of oriented silicon steel is complicated, Composition Control is strict, inclusion content requires extremely low, manufacturing process head is many with influence factor, therefore its quality product is often considered to the mark of a national special steel manufacturing technology level, has the laudatory title of " artistic product " in steel product.Si is that oriented silicon steel obtains one of main alloy element of lower iron loss, and the Si content general control of oriented silicon steel is in the scope of 2.8 ~ 3.3%.Due to the raising of silicone content, the toughness of steel sharply declines, and thermal conductivity also declines thereupon.The toughness of oriented silicon steel and temperature have very close relationship, and along with the decline of temperature, the intensity of silicon steel sharply rises, and toughness also obviously declines.Therefore, the heating of the strand of oriented silicon steel or rate of cooling too fast, just easily crack, general continuously cast bloom also can make strand produce serious internal fissure under the condition of air cooling.The bight of slab is owing to being in Three-dimensional Heat-transfer state, and in cooling or heat-processed, by the speed than other positions comparatively greatly, its thermal stresses is also larger, and strand inside more easily produces tiny crack for its rate of heating or speed of cooling.
There is the directional silicon steel slab of tiny crack in the hot rolling, under the effect of rolling load, tiny crack is constantly expanded, and extends, finally occur that defect is split on limit to surface, especially in the finishing train of hot continuous rolling, under tension, because edge temperature is low, poor toughness, add the expansion of tiny crack, while it is just very outstanding to split phenomenon.While the coils of hot-rolled steel split, by raw edges complete resection, otherwise must just there will be broken belt accident time cold rolling, affect cold rolling production.While the degree of depth split is larger, edge excision is more, and cold rolling lumber recovery is just on the low side.In order to make the cold rolling production of oriented silicon steel carry out smoothly, improve lumber recovery, research prevents the method for hot-rolling edge cracking very necessary, also has greatly realistic meaning.
Summary of the invention
in order to overcome prior art deficiency, the invention provides a kind of method preventing oriented silicon steel hot-rolling edge cracking, the technology of the present invention solves the mass defect that oriented silicon steel course of hot rolling produces, and reduces cold rolling trimming amount, thus improve cold rolling lumber recovery, reduce production cost.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Prevent a method for oriented silicon steel hot-rolling edge cracking, comprise process furnace heating and smart bundle process:
A: the temperature before control directional silicon steel slab bight enters process furnace is not less than 550 DEG C;
In process furnace temperature-rise period, rate of heating is decided by the temperature difference of furnace temperature and plate temperature and thermal conductivity, and control to enter the temperature of directional silicon steel slab before process furnace, the especially temperature in its bight, will control rate of heating during oriented silicon steel heating.
B: controlling preheating section temperature in process furnace is 950 ~ 1050 DEG C, and the first heating zone temperature is 1050 ~ 1150 DEG C;
The thermal conductivity of oriented silicon steel, in room temperature within the scope of 1000 DEG C, with the rising of temperature, thermal conductivity declines, and about 950 DEG C reach minimum value, and when more than 1000 DEG C, thermal conductivity raises with the rising of temperature.Process furnace preheating section does not generally have burner, and its temperature height is relevant with the first heating zone temperature.Control the first heating zone temperature within the scope of 1050 ~ 1150 DEG C, preheating section temperature controls 950 ~ 1050 DEG C of scopes in addition, thus controls the rate of heating of slab at preheating section.
C: controlling entry temperature at finishing is 1050 ~ 1150 DEG C, and finish rolling finishing temperature is 900 ~ 1000 DEG C.
Temperature makes steel be in higher temperature when finish rolling, and toughness is better, prevents producing limit under tension and splits.
Preferably, in step B, preheating section temperature is 1000 DEG C, and the first heating zone temperature of process furnace is 1100 DEG C.
Preferably, in step C, entry temperature at finishing is 1100 DEG C, and finish rolling finishing temperature is 950 DEG C.
The present invention prevents the method for oriented silicon steel hot-rolling edge cracking in the production process being applied to oriented silicon steel, and except technical scheme provided by the invention, the production technique of all the other oriented silicon steels all can adopt production technique of the prior art, also can in the following manner:
The temperature that slab enters process furnace should be greater than 400 DEG C, the preheating section temperature of process furnace is 950 ~ 1050 DEG C, first heating zone temperature is 1050 ~ 1150 DEG C, second heating zone and soaking zone temperature control at 1250 ~ 1320 DEG C, after heating of plate blank, carry out roughing and finish rolling, the passage of rolling can need to adjust according to technique, using reversing rougher slab to be rolled to thickness is 38 ~ 40mm, slab after roughing is rolled to the coils of hot-rolled steel that thickness is 2.3 ~ 2.5mm by finishing train, and wherein the temperature of rough rolling process is 1050 ~ 1150 DEG C; The temperature in of finishing train is 1000 ~ 1150 DEG C, and the temperature in of finish rolling finishing temperature is 900 ~ 1000 DEG C.In finishing stands, under the prerequisite ensureing stable rolling, reduce interstand tension as far as possible, prevent directional silicon steel slab under the effect of hightension, producing limit and split.For 7 frame tandem rollings, tension control between frame 1 ~ frame 2 is at 4.0 ~ 4.5MPa, tension control between frame 2 ~ frame 3 is at 4.5 ~ 5.0MPa, tension control between frame 3 ~ frame 4 is at 5.0 ~ 5.5MPa, tension control between frame 4 ~ frame 5 is at 5.5 ~ 6.0MPa, tension control between frame 5 ~ frame 6 is at 6.0 ~ 6.5MPa, and the tension control between frame 6 ~ frame 7 is at 6.5 ~ 7.0MPa.
The present invention compared with prior art, tool has the following advantages: enter by controlling slab the temperature that chimney corner portion temperature and adds, reduce the thermal stresses in bight during heating, prevent internal fissure, control finish rolling entrance and the finishing temperature of Continuous mill train, reasonable set interstand tension, thus the generation preventing hot-rolling edge cracking defect.
Accompanying drawing explanation
Fig. 1 is the edge diagram of the oriented silicon steel hot rolled coil GL1 adopting prior art to produce;
Fig. 2 is the edge diagram adopting the oriented silicon steel hot rolled coil GL1 that technical scheme is produced in the embodiment of the present invention 3.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1:
Slab is sent in process furnace, control slab and enter the temperature of process furnace higher than 400 DEG C, its bight temperature is not less than 550 DEG C, the preheating section temperature of process furnace is 950 DEG C, first heating zone temperature is 1050 DEG C, second heating zone and soaking zone temperature control at 1250 DEG C, after heating of plate blank, carry out roughing, use reversing rougher rolling 5 passage, being rolled to slab thickness is 40mm, then finish rolling is carried out, use 7 frame finishing train rolling 7 passages, become by the slab rolling after roughing thickness to be the coils of hot-rolled steel of 2.5mm, wherein the temperature of rough rolling process is 1050 DEG C; The temperature in of finishing train is 1050 DEG C, and finish rolling finishing temperature is 900 DEG C.Tension control between frame 1 ~ frame 2 is at 4.0MPa, tension control between frame 2 ~ frame 3 is at 4.5 ~ 5.0MPa, tension control between frame 3 ~ frame 4 is at 5.0 ~ 5.5MPa, tension control between frame 4 ~ frame 5 is at 5.5 ~ 6.0MPa, tension control between frame 5 ~ frame 6 is at 6.0 ~ 6.5MPa, and the tension control between frame 6 ~ frame 7 is at 6.5 ~ 7.0MPa.
Embodiment 2:
Slab is sent in process furnace, control slab and enter the temperature of process furnace higher than 400 DEG C, its bight temperature is not less than 550 DEG C, the preheating section temperature of process furnace is 1050 DEG C, first heating zone temperature is 1150 DEG C, second heating zone and soaking zone temperature control at 1320 DEG C, after heating of plate blank, carry out roughing, use reversing rougher rolling 5 passage, being rolled to slab thickness is 38mm, then finish rolling is carried out, use 7 frame finishing train rolling 7 passages, thickness is become by slab rolling after roughing to be the coils of hot-rolled steel of 2.3mm, wherein the temperature of rough rolling process is 1150 DEG C, the temperature in of finishing train is 1150 DEG C, and finish rolling finishing temperature is 1000 DEG C.Tension control between frame 1 ~ frame 2 is at 4.0 ~ 4.5MPa, tension control between frame 2 ~ frame 3 is at 4.5 ~ 5.0MPa, tension control between frame 3 ~ frame 4 is at 5.0 ~ 5.5MPa, tension control between frame 4 ~ frame 5 is at 5.5 ~ 6.0MPa, tension control between frame 5 ~ frame 6 is at 6.0 ~ 6.5MPa, and the tension control between frame 6 ~ frame 7 is at 6.5 ~ 7.0MPa.
Embodiment 3:
Slab is sent in process furnace, control slab and enter the temperature of process furnace higher than 400 DEG C, its bight temperature is not less than 550 DEG C, the preheating section temperature of process furnace is 1000 DEG C, first heating zone temperature is 1000 DEG C, second heating zone and soaking zone temperature control at 1300 DEG C, after heating of plate blank, carry out roughing, use reversing rougher rolling 6 passage, being rolled to slab thickness is 39mm, then finish rolling is carried out, use 7 frame finishing train rolling 7 passages, thickness is become by slab rolling after roughing to be the coils of hot-rolled steel of 2.3mm, wherein the temperature of rough rolling process is 1100 DEG C, the temperature in of finishing train is 1000 DEG C, and finish rolling finishing temperature is 950 DEG C.Tension control between frame 1 ~ frame 2 is at 4.0 ~ 4.5MPa, tension control between frame 2 ~ frame 3 is at 4.5 ~ 5.0MPa, tension control between frame 3 ~ frame 4 is at 5.0 ~ 5.5MPa, tension control between frame 4 ~ frame 5 is at 5.5 ~ 6.0MPa, tension control between frame 5 ~ frame 6 is at 6.0 ~ 6.5MPa, and the tension control between frame 6 ~ frame 7 is at 6.5 ~ 7.0MPa.
Claims (1)
1. prevent a method for oriented silicon steel hot-rolling edge cracking, the temperature comprising process furnace heating and the operation of rolling controls, and it is characterized in that:
Control slab and enter the temperature of process furnace higher than 400 DEG C, its bight temperature is not less than 550 DEG C, the preheating section temperature of process furnace is 950 DEG C, first heating zone temperature is 1050 DEG C, second heating zone and soaking zone temperature control at 1250 DEG C, after heating of plate blank, carry out roughing, use reversing rougher rolling 5 passage, being rolled to slab thickness is 40mm, then carries out finish rolling, uses 7 frame finishing train rolling 7 passages, become by slab rolling after roughing thickness to be the coils of hot-rolled steel of 2.5mm, wherein the temperature of rough rolling process is 1050 DEG C; The temperature in of finishing train is 1050 DEG C, and finish rolling finishing temperature is 900 DEG C;
Tension control between 7 frame finishing train mid frame 1 ~ frames 2 is at 4.0MPa, tension control between frame 2 ~ frame 3 is at 4.5 ~ 5.0MPa, tension control between frame 3 ~ frame 4 is at 5.0 ~ 5.5MPa, tension control between frame 4 ~ frame 5 is at 5.5 ~ 6.0MPa, tension control between frame 5 ~ frame 6 is at 6.0 ~ 6.5MPa, and the tension control between frame 6 ~ frame 7 is at 6.5 ~ 7.0MPa.
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| CN104815851B (en) * | 2014-12-24 | 2016-12-07 | 北京首钢股份有限公司 | A kind of method controlling heating of plate blank |
| CN105396879B (en) * | 2015-12-15 | 2018-08-14 | 北京首钢股份有限公司 | The control method that a kind of high grade non-oriented silicon steel cold continuous rolling side is split |
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| CN108193037B (en) * | 2018-01-12 | 2019-07-26 | 新余钢铁股份有限公司 | One kind preventing orientation silicon steel hot-rolling edge cracking technique |
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| CN113058998B (en) * | 2021-03-18 | 2022-11-18 | 鞍钢股份有限公司 | Method for preventing hot-rolled edge crack of low-temperature heating oriented silicon steel |
| CN113145646B (en) * | 2021-04-23 | 2021-12-10 | 无锡普天铁心股份有限公司 | Process for improving edge cracking of silicon steel edge |
| CN113953335B (en) * | 2021-09-16 | 2023-06-20 | 包头钢铁（集团）有限责任公司 | Manufacturing method for eliminating hot rolling edge cracks of oriented silicon steel |
| 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 |
| CN114632818B (en) * | 2022-03-14 | 2023-12-05 | 安阳钢铁股份有限公司 | Technological method for reducing hot rolling edge cracking of oriented silicon steel |
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Inventor after: Wang Xinjiang Inventor after: He Xiaobo Inventor after: Wang Zhongqi Inventor after: Li Zhihui Inventor after: Mao Jinhua Inventor after: Wei Xian Inventor after: Guo Shibao Inventor after: Li Changchun Inventor after: Zhang Zhenshen Inventor after: Liu Sheniu Inventor after: Liu Haiqiang Inventor after: Xu Dangwei Inventor before: Wang Xinjiang Inventor before: He Xiaobo Inventor before: Wang Zhongqi Inventor before: Li Zhihui Inventor before: Mao Jinhua Inventor before: Wei Xian Inventor before: Guo Shibao Inventor before: Li Changchun Inventor before: Zhang Zhenshen Inventor before: Liu Sheniu Inventor before: Liu Haiqiang Inventor before: Xu Dangwei |
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