CN107617647B - Method for producing hot-rolled strip steel with thickness less than or equal to 1.2mm by continuous casting and rolling of sheet billet - Google Patents
Method for producing hot-rolled strip steel with thickness less than or equal to 1.2mm by continuous casting and rolling of sheet billet Download PDFInfo
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Abstract
The invention relates to a method for producing hot-rolled strip steel with the thickness less than or equal to 1.2mm by continuous casting and rolling of sheet billets, which comprises the following steps: 1) steel making: smelting in a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is 52-55 mm; 2) soaking the raw materials: the discharging temperature of the continuous casting billet is 1200-1220 ℃; 3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet; 4) finish rolling: the continuous casting blank enters a finishing mill set and is rolled by adopting a dynamic variable specification technology, the dynamic variable specification reduction is 50-200 mu m, the dynamic variable specification reduction time sequence is 80-150 m away from the head of the strip steel, the finishing temperature is 840-860 ℃, and the continuous casting blank is rolled by the finishing mill set to form thin strip steel; 5) coiling: and (3) coiling the thin strip steel after laminar cooling, wherein the coiling temperature is 610-630 ℃. The thinnest thickness of the hot-rolled strip steel produced by the invention is 0.8mm, the threading is stable, and the phenomena of folding and rolling breakage are not easy to occur.
Description
Technical Field
The invention relates to the field of thin hot rolled strip steel manufacturing, in particular to a method for producing hot rolled strip steel with the thickness less than or equal to 1.2mm by thin slab continuous casting and rolling.
Background
According to market development trend analysis, thin plate strips for light weight equipment in container manufacturing, engineering machinery, automobile manufacturing and the like have wide market demands, and are also development directions of high value-added hot-rolled plate strips. In addition, with the increasing emphasis on light weight and cost reduction in the industry, the whole industry has an urgent need for hot rolling and thinning.
At present, three modes, namely semi-endless rolling of hot rolled strip steel with the thickness less than or equal to 1.2mm, full Endless (ESP) rolling of sunshine and full endless (CEM) rolling of Korea; the method for producing thin hot rolled strip by means of CSP thin slab continuous casting and rolling without the above-mentioned configuration of semi-endless, full endless rolling plants generally comprises the steps of: 1, steel making; 2, continuous casting; 3, heating; 4, finish rolling; 5, cooling and coiling; the CSP thin slab continuous casting and rolling production line directly enters a finishing mill set for continuous rolling after the slab comes out of a soaking pit furnace, has high temperature compared with the conventional hot rolled slab, has much smaller temperature difference between the head and the tail of the slab, has shorter CSP production time, newer production line equipment and better equipment precision level than other production lines, and creates congenital conditions for the rolling of thin hot rolled strip steel.
However, in the process of producing thin hot rolled strip steel by using a CSP thin slab continuous casting and rolling production line, because the strip steel is extremely thin, the phenomena of head folding and rolling breakage are easy to occur in the strip threading process, and the rolling stability is seriously influenced.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for producing hot rolled strip steel with the thickness less than or equal to 1.2mm by continuous casting and continuous rolling of thin slabs, which is stable in the strip steel threading process.
In order to realize the aim, the method for producing the hot rolled strip steel with the thickness less than or equal to 1.2mm by the thin slab continuous casting and rolling comprises the following steps:
1) steel making: smelting by adopting a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is controlled to be 52-55 mm;
2) soaking the raw materials: soaking the continuous casting billet, and controlling the tapping temperature of the continuous casting billet to be 1200-1220 ℃;
3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet;
4) finish rolling: the method comprises the following steps that a continuous casting blank enters a finishing mill set, roll gap cooling water of an F1-F4 rack penetrates through the rack and then is started, rolling is carried out by adopting a dynamic variable specification technology, the dynamic variable specification rolling reduction is controlled to be 50-200 mu m, the dynamic variable specification rolling reduction time sequence is 80-150 m away from the head of the strip steel, the target convexity of the strip steel is set to be 50-55 mu m, the final rolling temperature is 840-860 ℃, the passing speed is controlled to be less than or equal to 10.2m/s, and the continuous casting blank is rolled by the finishing mill set to form thin-specification strip steel;
5) coiling: and (3) coiling the thin strip steel after laminar cooling, and controlling the coiling temperature to be 610-630 ℃.
Preferably, the laminar cooling adopts a mode that the head part is not cooled by 1m and the rear section is slowly cooled, and the slow cooling speed of the rear section is 20-40 ℃/s.
Preferably, in the step 4), the thickness automatic control limiting value of the F6 rolling mill is 0.4-0.6 mm, and the thickness automatic control limiting value of the F7 rolling mill is 0.2-0.4 mm.
The better technical scheme for realizing the method for producing the hot rolled strip steel with the thickness less than or equal to 1.2mm by the thin slab continuous casting and rolling comprises the following steps:
1) steel making: smelting in a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is controlled to be 52 mm;
2) soaking the raw materials: soaking the continuous casting billet, and controlling the tapping temperature of the continuous casting billet to 1218 ℃;
3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet;
4) finish rolling: the method comprises the steps that a continuous casting blank enters a finishing mill group, roll gap cooling water of an F1-F4 rack penetrates through the rack at the head of the strip steel and then is started, rolling is carried out by adopting a dynamic variable specification technology, the dynamic variable specification reduction is controlled to be 200 mu m, the dynamic variable specification reduction time sequence is 150m away from the head of the strip steel, the automatic thickness control limit amplitude of an F6 rolling mill is 0.4mm, the automatic thickness control limit amplitude of an F7 rolling mill is 0.2mm, the target convexity of the strip steel is set to be 55 mu m, the final rolling temperature is 855 ℃, the speed of a passing plate is controlled to be 9.8m/s, and the continuous casting blank is rolled by the finishing mill group to form thin-; 5) coiling: and (3) coiling the thin-specification strip steel after laminar cooling, and controlling the coiling temperature to be 626 ℃.
Wherein, the dynamic gauge change (FGC) rolling reduction is the threading thickness-target thickness; the dynamic variable gauge (FGC) reduction time sequence is the distance from the head of the strip steel.
Compared with the traditional sheet billet continuous casting and rolling production line, the invention has the advantages that:
the invention adopts a dynamic variable specification technology (FGC) in a CSP thin slab continuous casting and rolling production line, wherein the dynamic variable specification technology (FGC) is used for carrying out specification change on strip steel in a rolling process, namely, the specification transition of the strip steel is realized by dynamically adjusting parameters such as roll gap, speed, tension and the like under the condition that a continuous rolling unit does not stop. The rolling reduction is controlled to be 50-200 mu m by adopting a dynamic specification changing technology, namely, the threading is carried out by adding 50-200 mu m on the basis of the target thickness of the strip steel, so that the risks of folding and puncturing are obviously reduced and the threading stability is improved compared with the threading directly carried out under the target thickness of the strip steel.
2, the invention limits the time of dynamic variable specification reduction operation, ensures FGC reduction after the coiler bites steel, and improves the rolling stability.
3, the invention sets the thickness automatic control (AGC) amplitude limiting values of an F6 rolling mill and an F7 rolling mill, and has the characteristic of improving the rolling stability in order to limit the threading of the head of the strip steel and the adjustment amount of the AGC in the rolling process.
4, the laminar cooling adopts a mode that the head part is not cooled by 1m and the rear section is slowly cooled, and the speed of limiting the through plate is less than or equal to 10.2m/s, so that the head part of the thin-specification strip steel can be effectively prevented from being low in temperature, the head part of the strip steel is prevented from turning up on a roller way, and the laminar cooling has the characteristics of ensuring the stable operation of the thin-specification strip steel on the laminar cooling roller way and avoiding steel scrap accidents.
5, the thinnest thickness of the thin hot rolled strip steel obtained by the CSP thin slab continuous casting and rolling production line is 1.0mm, but the thin hot rolled strip steel with the thickness of 0.8mm is obtained by the CSP thin slab continuous casting and rolling and FGC technology by a single block rolling method under the condition of no semi-endless or completely endless equipment configuration, and the method has important significance in the field of preparation of the thin hot rolled strip steel.
Drawings
FIG. 1 is a thickness profile of a hot rolled steel strip obtained in example 1;
FIG. 2 is a thickness profile of a hot rolled steel strip obtained in example 2;
FIG. 3 is a thickness profile of a hot rolled steel strip obtained in example 3;
FIG. 4 is a thickness profile of the hot rolled strip obtained in example 4;
FIG. 5 is a thickness profile of the hot rolled strip obtained in example 5;
FIG. 6 is a thickness profile of the hot rolled strip obtained in example 6;
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
The invention provides a method for producing thin hot rolled strip steel with thickness less than or equal to 1.2mm by continuous casting and rolling of thin slabs, which aims to solve the problems of poor strip steel threading stability and easy strip steel folding and rolling breakage in the existing technology for producing the thin hot rolled strip steel by continuous casting and rolling of the thin slabs. The preferred mode of the method for producing hot rolled steel strip having a thickness of 1.2mm or less by continuous thin slab casting and rolling according to the present invention will be described in detail below by way of specific examples.
Examples 1 to 6
The method for producing hot rolled strip steel with the thickness less than or equal to 1.2mm by continuous casting and rolling of thin slabs comprises the following steps:
1) steel making: smelting by adopting a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is controlled to be 52-55 mm;
2) soaking the raw materials: soaking the continuous casting billet, and controlling the tapping temperature of the continuous casting billet to be 1200-1220 ℃;
3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet;
4) finish rolling: the method comprises the following steps that a continuous casting blank enters a finishing mill set, roll gap cooling water of an F1-F4 rack penetrates through the rack and then is started, rolling is carried out by adopting a dynamic variable specification technology, the dynamic variable specification rolling reduction is controlled to be 50-200 mu m, the dynamic variable specification rolling reduction time sequence is 80-150 m away from the head of the strip steel, the target convexity of the strip steel is set to be 50-55 mu m, the final rolling temperature is 840-860 ℃, the passing speed is controlled to be less than or equal to 10.2m/s, and the continuous casting blank is rolled by the finishing mill set to form thin-specification strip steel; the thickness automatic control limiting value of the F6 rolling mill is 0.4-0.6 mm, and the thickness automatic control limiting value of the F7 rolling mill is 0.2-0.4 mm.
5) Coiling: and (3) coiling the thin strip steel after laminar cooling, controlling the coiling temperature to be 610-630 ℃, wherein the laminar cooling adopts a mode that the head part is not cooled by 1m and the rear section is slowly cooled, and the slow cooling speed of the rear section is 20-40 ℃/s.
Six examples, example 1, example 2, example 3, example 4, example 5 and example 6, were prepared according to the process parameters requirements of the present invention; specific process parameters for the six examples are shown in table 1:
TABLE 1 Process parameters for examples 1-6
In the embodiments 1 to 6, the cooling water of the F1-F4 roll gaps is opened after the head of the strip steel penetrates through the frame, so that the strip penetrating stability of the thin strip steel is ensured. FGC reduction time sequence is controlled to be 80-150 m, FGC reduction is carried out after the coiling machine bites steel, and rolling stability is improved.
The thickness curves of the thin hot-rolled steel strips obtained in examples 1 to 6 are shown in FIGS. 1 to 6, respectively, and it is understood that the thickness of the thin hot-rolled steel strips obtained in examples 1 to 6 is 1.2mm or less, and particularly that the thickness of the thin hot-rolled steel strip obtained in example 6 is only 0.835 mm.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (2)
1. A method for producing hot rolled strip steel with the thickness less than or equal to 1.2mm by thin slab continuous casting and rolling is characterized by comprising the following steps: the method comprises the following steps:
1) steel making: smelting by adopting a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is controlled to be 52-55 mm;
2) soaking the raw materials: soaking the continuous casting billet, and controlling the tapping temperature of the continuous casting billet to be 1200-1220 ℃;
3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet;
4) finish rolling: the method comprises the following steps that a continuous casting blank enters a finishing mill set, roll gap cooling water of an F1-F4 rack penetrates through the rack and then is started, rolling is carried out by adopting a dynamic variable specification technology, the dynamic variable specification rolling reduction is controlled to be 50-200 mu m, the dynamic variable specification rolling reduction time sequence is 80-150 m away from the head of the strip steel, the target convexity of the strip steel is set to be 50-55 mu m, the final rolling temperature is 840-860 ℃, the passing speed is controlled to be less than or equal to 10.2m/s, and the continuous casting blank is rolled by the finishing mill set to form thin-specification strip steel;
5) coiling: coiling the thin-specification strip steel after laminar cooling, and controlling the coiling temperature to be 610-630 ℃;
the laminar cooling adopts a mode that the head part is not cooled by 1m and the rear section is slowly cooled, and the slow cooling speed of the rear section is 20-40 ℃/s;
in the step 4), the thickness automatic control limiting value of the F6 rolling mill is 0.4-0.6 mm, and the thickness automatic control limiting value of the F7 rolling mill is 0.2-0.4 mm.
2. The method for producing hot rolled strip steel with thickness less than or equal to 1.2mm by continuous casting and rolling of thin slabs as claimed in claim 1, wherein: the method comprises the following steps:
1) steel making: smelting in a converter, refining outside the converter and continuously casting into a blank, wherein the thickness of the continuously cast blank is controlled to be 52 mm;
2) soaking the raw materials: soaking the continuous casting billet, and controlling the tapping temperature of the continuous casting billet to 1218 ℃;
3) descaling: carrying out high-pressure descaling on the uniformly heated continuous casting billet;
4) finish rolling: the method comprises the steps that a continuous casting blank enters a finishing mill group, roll gap cooling water of an F1-F4 rack penetrates through the rack at the head of the strip steel and then is started, rolling is carried out by adopting a dynamic variable specification technology, the dynamic variable specification reduction is controlled to be 200 mu m, the dynamic variable specification reduction time sequence is 150m away from the head of the strip steel, the automatic thickness control limit amplitude of an F6 rolling mill is 0.4mm, the automatic thickness control limit amplitude of an F7 rolling mill is 0.2mm, the target convexity of the strip steel is set to be 55 mu m, the final rolling temperature is 855 ℃, the speed of a passing plate is controlled to be 9.8m/s, and the continuous casting blank is rolled by the finishing mill group to form thin-;
5) coiling: and (3) coiling the thin-specification strip steel after laminar cooling, and controlling the coiling temperature to be 626 ℃.
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| CN111266406B (en) * | 2020-03-02 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111451290A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Production method for preventing thin strip steel head from being folded |
| CN111570514B (en) * | 2020-06-01 | 2022-05-03 | 攀钢集团西昌钢钒有限公司 | Stable production method of ultrathin titanium plate |
| CN112692056A (en) * | 2020-12-30 | 2021-04-23 | 唐山燕山钢铁有限公司 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
| CN113042538B (en) * | 2021-03-03 | 2023-02-17 | 首钢京唐钢铁联合有限责任公司 | Control method and device for rolling deviation of hot rolled strip steel |
| CN113578975B (en) * | 2021-07-21 | 2023-06-13 | 张家港扬子江冷轧板有限公司 | Method for rapidly changing specifications of acid rolling mill |
| CN114535294A (en) * | 2022-03-14 | 2022-05-27 | 武汉钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 1.0mm by CSP production line |
| CN115382913A (en) * | 2022-09-21 | 2022-11-25 | 福建鼎盛钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 0.8mm based on full endless thin slab continuous casting and rolling |
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| KR101451725B1 (en) * | 2012-12-27 | 2014-10-16 | 주식회사 포스코 | Method for controlling temperature of strip into finishing mill stand |
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