CN102441648A - Method for continuously casting steel plate billets for automotive frames - Google Patents
Method for continuously casting steel plate billets for automotive frames Download PDFInfo
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- CN102441648A CN102441648A CN2010105045301A CN201010504530A CN102441648A CN 102441648 A CN102441648 A CN 102441648A CN 2010105045301 A CN2010105045301 A CN 2010105045301A CN 201010504530 A CN201010504530 A CN 201010504530A CN 102441648 A CN102441648 A CN 102441648A
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Abstract
The invention provides a method for continuously casting steel plate billets for automotive frames, which includes the steps that molten steel is poured into a mold from a tundish, covering slag is added to the liquid level of the molten steel, the molten steel is vibrated by the mold and cooled by a wide surface and a narrow surface to form an incompletely solidified casting blank, and then the casting blank is pulled out of the mold at a casting speed Vc and sequentially passes through a secondary cooling area and an air cooling area to obtain a completely solidified casting blank; the casting speed Vc is controlled within 1.0-1.3m/min; the ratio of the heat flow of the narrow surface to that of the wide surface ranges from 0.75 to 0.85; and the binary alkalinity of the covering slag ranges from 1.0 to 1.15, and the viscosity of the covering slag ranges from 0.10PaXs to 0.25 PaXs. On one hand, the ratio of the heat flow of the narrow surface to that of the wide surface is comprehensively controlled, so that cooling of the molten steel in the mold can be reasonably controlled, namely, the molten steel is evenly cooled along the directions of the wide surface and the narrow surface in the mold to form a crack-free blank shell. On the other hand, by controlling the alkalinity and the viscosity of the covering slag, the covering slag can form flux films with fine lubrication among the blank shell and copper plates of the wide surface and the narrow surface of the mold, so that cracks are prevented.
Description
Technical field
The present invention relates to the method for continuous casting steel for automobile crossbeam slab.
Background technology
Steel for automobile crossbeam is mainly used in the production automotive frame and automobile bodies is vertical, crossbeam, thereby the mechanical performance of steel for automobile crossbeam is had relatively high expectations.Because the particularity of its purposes so steel for automobile crossbeam is very strict to the quality requirement of strand and stocking, especially must guarantees the surface quality of strand and stocking, otherwise not only influence attractive in appearance but also in use occur accident easily.
Because the carbon content of steel for automobile crossbeam is in the peritectoid district; Belong to the crack sensitivity steel grade, reason such as unreasonable because of the ratio of leptoprosopy hot-fluid that peritectic reaction, crystallizer take place and wide hot-fluid (be called for short leptoprosopy with wide hot-fluid than) in casting process, that the covering slag performance is bad makes slab produce transverse corner crack line (along the crackle of width of plate slab direction) easily.And after the transverse corner crack line process that produces on the continuous casting steel billet was rolling, longitudinally (being the length direction of slab) expanded and caused rolling defectives such as the generation of plate surface scabs, streak, thereby influenced recovery rate of iron and strand lumber recovery, caused the increase of production cost.
Summary of the invention
Technical problem to be solved by this invention is to avoid or weaken at least when continuous casting steel for automobile crossbeam slab, producing the transverse corner crack line.
For solving the problems of the technologies described above; The present invention provides a kind of method of continuous casting steel for automobile crossbeam slab; This method comprises molten steel is poured into crystallizer from tundish; In said crystallizer, on liquid steel level, add covering slag, molten steel forms the strand that does not solidify fully through the vibration of said crystallizer and wide the cooling effect with leptoprosopy of said crystallizer; Then with this strand that does not solidify fully with pulling rate V
cFrom said crystallizer, pull out and pass through successively secondary cooling zone and air cooling zone, with the strand that is solidified fully; Wherein: with pulling rate V
cBe controlled at 1.0-1.3m/min; The leptoprosopy hot-fluid of said crystallizer is 0.75-0.85 with the ratio of wide hot-fluid; The dual alkalinity of said covering slag is 1.0-1.15, and viscosity is 0.10-0.25Pas.
In the technique scheme of the present invention; On the one hand, through the leptoprosopy hot-fluid of Comprehensive Control crystallizer and the ratio of wide hot-fluid, can reasonably control the cooling of molten steel in crystallizer; Molten steel is evenly cooled off with the leptoprosopy direction along wide in crystallizer, form flawless base shell.On the other hand, through the basicity and the viscosity of control covering slag, covering slag can form the good slag film of lubricity between the copper coin of base shell and crystallizer wide and leptoprosopy, further guaranteeing the lubricity between base shell and the copper coin, thereby prevents that crackle from producing.
Other features and advantages of the present invention will partly specify in the specific embodiment subsequently.
The specific embodiment
Should be understood that the specific embodiment described herein only is used for explanation and explains the present invention, is not limited to the present invention.
The method of continuous casting steel for automobile crossbeam slab of the present invention comprises molten steel is poured into crystallizer from tundish; In said crystallizer; On liquid steel level, add covering slag, molten steel forms the strand that does not solidify fully through the vibration of said crystallizer and wide the cooling effect with leptoprosopy of said crystallizer; Then with this strand that does not solidify fully with pulling rate V
cFrom said crystallizer, pull out and pass through successively secondary cooling zone and air cooling zone, with the strand that is solidified fully; Wherein: with pulling rate V
cBe controlled at 1.0-1.3m/min; The leptoprosopy hot-fluid of said crystallizer is 0.75-0.85 with the ratio of wide hot-fluid; The dual alkalinity of said covering slag is 1.0-1.15, and viscosity is 0.10-0.25Pas.
Wherein, the dual alkalinity of covering slag refers to the ratio of the weight percentage of CaO and SiO in the covering slag composition.In addition, like ground conventionally known to one of skill in the art, crystallizer forms the body structure with leptoprosopy and wide.The leptoprosopy of crystallizer and wide are made up of copper coin, are formed with the tank that is used for flow of cooling water on the copper coin, thereby take away the heat that distributes when molten steel forms strand through cooling-water flow.The ratio of effective heat transfer area of heat that leptoprosopy and wide 's cooling water is taken away and leptoprosopy and wide is respectively leptoprosopy hot-fluid and wide hot-fluid.In the present invention, according to pulling rate V
c(1.0-1.3m/min), the ratio of leptoprosopy hot-fluid and wide hot-fluid is controlled at 0.75-0.85, thus make molten steel in crystallizer along leptoprosopy and wide evenly cooling, avoid cracking.
Preferably, can make that the leptoprosopy hot-fluid and the ratio of wide hot-fluid are 0.75-0.85 through controlling wide cooling water inflow with leptoprosopy.In a kind of preferred implementation of the present invention, said wide cooling water inflow is 2900-2950L/min, and the cooling water inflow of said leptoprosopy is 360-400L/min.Here, wide cooling water inflow with leptoprosopy all refers to the cooling water inflow of wide and one leptoprosopy.
The composition of the covering slag that uses among the present invention by weight percentage, can be CaO:25%-35%, SiO
2: 27%-37%, Al
2O
3: 1%-12%, MgO:1%-10%, Na
2O:5%-15%, F
-: 1%-10%.Preferably, according to the size of slab, the consumption per ton of steel that can make said covering slag is 0.46-0.55kg/t, to guarantee the lubricity between base shell and the copper coin.
In the present invention, can the leptoprosopy tapering of said crystallizer be set at 1.0-1.2%/m.
In addition, when cast, if the degree of superheat of molten steel is too little, molten steel is prone to polluted by field trash, is prone to make the mouth of a river to take place to stop up even freeze simultaneously; And if the degree of superheat of molten steel is too big, the strand center segregation is increased the weight of, even bring out the bleedout accident, perhaps the thin crackle that occurs of base shell because of forming.Among the present invention, preferably when cast, make the degree of superheat of molten steel remain on 20-30 ℃.
In addition, when secondary cooling zone was sprayed water cooling, the specific water was preferably 0.4-0.55kg/ ton steel.Through adopting more weak secondary cooling system relatively, the crackle that can avoid casting billet surface to cause because of intensity of cooling is excessive.Preferably, can make the temperature of part of exit position 12-16m of the said crystallizer of distance of said strand remain on 900-1000 ℃.Wherein, Because the distribution of di-cold spray nozzle makes that the cooling of each several part is also inhomogeneous in the casting process; Thereby can occur rising again, to cause not be continuous decline apart from the temperature on the part of the exit position 12-16m of crystallizer, but the process of having passed through decline, rising, having descended again.
The present invention can generally be suitable for the sheet billet continuous casting of steel for automobile crossbeam, and the N content that is particularly useful in the molten steel is the steel for automobile crossbeam of 0.003%-0.007% (percetage by weight).For example, go for 510L steel or 590L steel.
The present invention can preferably be suitable for continuous casting and obtain the strand that final size is 200mm * 1050mm or 200mm * 1080mm or 200mm * 1250mm.
Through specific embodiment method of the present invention is described below.
Embodiment 1
Use the 510L plate slab of method continuous casting cross section of the present invention as 200mm * 1080mm, the composition of 510L steel is as shown in table 1.
The molten steel of 510L steel is poured into crystallizer from tundish, and pouring temperature is 1553 ℃, and the degree of superheat is 25 ℃; On liquid steel level, add covering slag, the composition of covering slag is CaO:25%-35%, SiO
2: 27%-37%, Al
2O
3: 1%-12%, MgO:1%-10%, Na
2O:5%-15%, F
-: 1%-10%, dual alkalinity are 1.04, and viscosity is 0.16Pas, and the consumption per ton of steel of covering slag is 0.51kg/t; The leptoprosopy tapering of crystallizer is 1.08%/m, and wide the cooling water inflow with leptoprosopy is respectively 2930L/min and 380L/min, and leptoprosopy is 0.81 with wide hot-fluid ratio; Secondary cooling zone and air cooling zone are pulled out and passed through successively to this strand that does not solidify fully with pulling rate 1.1m/min from said crystallizer; Wherein, The specific water of secondary cooling zone is 0.5kg/t, and the temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 987 ℃, 968 ℃, 935 ℃, 970 ℃ and 965 ℃.
Table 1
Embodiment 2
Use the method continuous casting 510L plate slab of embodiment 1, pouring temperature is 1558 ℃, and the degree of superheat is 30 ℃; On liquid steel level, add covering slag, the dual alkalinity of covering slag is 1.1, and viscosity is 0.12Pas, and the consumption per ton of steel of covering slag is 0.48kg/t; Wide the cooling water inflow with leptoprosopy is respectively 2900L/min and 400L/min, and leptoprosopy is 0.85 with wide hot-fluid ratio; Secondary cooling zone and air cooling zone are pulled out and passed through successively to this strand that does not solidify fully with pulling rate 1.0m/min from said crystallizer; Wherein, The specific water of secondary cooling zone is 0.55kg/t, and the temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 992 ℃, 983 ℃, 942 ℃, 969 ℃ and 965 ℃.
Embodiment 3
Use the method continuous casting 510L plate slab of embodiment 1, pouring temperature is 1548 ℃, and the degree of superheat is 20 ℃; On liquid steel level, add covering slag, the dual alkalinity of covering slag is 1.15, and viscosity is 0.1Pas, and the consumption per ton of steel of covering slag is 0.55kg/t; Wide the cooling water inflow with leptoprosopy is respectively 2950L/min and 360L/min, and leptoprosopy is 0.79 with wide hot-fluid ratio; The temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 982 ℃, 970 ℃, 926 ℃, 953 ℃ and 957 ℃.
Embodiment 4
Use the method continuous casting 590L plate slab of embodiment 1, the composition of 590L steel is as shown in table 2.
Pouring temperature is 1551 ℃, and the degree of superheat is 30 ℃; On liquid steel level, add covering slag, the dual alkalinity of covering slag is 1.0, and viscosity is 0.25Pas, and the consumption per ton of steel of covering slag is 0.5kg/t; The leptoprosopy tapering of crystallizer is 1.2%/m, and wide the cooling water inflow with leptoprosopy is respectively 2900L/min and 400L/min, and leptoprosopy is 0.85 with wide hot-fluid ratio; Secondary cooling zone and air cooling zone are pulled out and passed through successively to this strand that does not solidify fully with pulling rate 1.1m/min from said crystallizer; Wherein the specific water of secondary cooling zone is 0.47kg/t, and the temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 989 ℃, 966 ℃, 929 ℃, 949 ℃ and 956 ℃.
Table 2
Embodiment 5
Use the method continuous casting 590L plate slab of embodiment 1, pouring temperature is 1541 ℃, and the degree of superheat is 20 ℃; On liquid steel level, add covering slag, the dual alkalinity of covering slag is 1.06, and viscosity is 0.21Pas, and the consumption per ton of steel of covering slag is 0.46kg/t; The leptoprosopy tapering of crystallizer is 1.06%/m, and wide the cooling water inflow with leptoprosopy is respectively 2930L/min and 400L/min, and leptoprosopy is 0.75 with wide hot-fluid ratio; Secondary cooling zone and air cooling zone are pulled out and passed through successively to this strand that does not solidify fully with pulling rate 1.0m/min from said crystallizer; Wherein, The specific water of secondary cooling zone is 0.52kg/t, and the temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 982 ℃, 962 ℃, 915 ℃, 953 ℃ and 952 ℃.
Embodiment 6
Use the 510L plate slab of method continuous casting 200mm * 1050mm of embodiment 1, pouring temperature is 1556 ℃, and the degree of superheat is 28 ℃; The leptoprosopy tapering of crystallizer is 1.0%/m, and wide the cooling water inflow with leptoprosopy is respectively 2900L/min and 400L/min, and leptoprosopy is 0.75 with wide hot-fluid ratio; Pulling rate is 1.05m/min, and the specific water of secondary cooling zone is 0.4kg/t; The temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 998 ℃, 973 ℃, 925 ℃, 958 ℃ and 970 ℃.
Embodiment 7
Use the 510L plate slab of method continuous casting 200mm * 1250mm of embodiment 1, pouring temperature is 1548 ℃, and the degree of superheat is 20 ℃; The leptoprosopy tapering of crystallizer is 1.2%/m, and wide the cooling water inflow with leptoprosopy is respectively 2910L/min and 370L/min, and leptoprosopy is 0.71 with wide hot-fluid ratio; Pulling rate is 1.3m/min, and the specific water of secondary cooling zone is 0.47kg/t; The temperature that the position of the said crystallizer outlet of distance 12m, 13m, 14m, 15m and 16m records on said strand is respectively 990 ℃, 968 ℃, 914 ℃, 950 ℃ and 962 ℃.
The cast finish after, to the slab cc billet surface quality spread out the inspection and follow-up investigations the postorder mill bar quality, check result shows that casting billet surface transverse corner crack line defective has obtained inhibition.Be embodied in defectives such as having eliminated stocking limit portion scabs, streak.
Need to prove that each the concrete technical characterictic described in the above-mentioned specific embodiment can carry out combination in any through any suitable manner, it falls within the disclosed scope of the present invention equally.In addition, also can carry out combination in any between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be regarded as the disclosed content of the present invention equally.
More than describe preferred implementation of the present invention in detail; But the present invention is not limited to the detail in the above-mentioned embodiment, in technical conceive scope of the present invention; Can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (11)
1. the method for a continuous casting steel for automobile crossbeam slab; This method comprises molten steel is poured into crystallizer from tundish; In said crystallizer; On liquid steel level, add covering slag, molten steel forms the strand that does not solidify fully through the vibration of said crystallizer and wide the cooling effect with leptoprosopy of said crystallizer; Then with this strand that does not solidify fully with pulling rate V
cFrom said crystallizer, pull out and pass through successively secondary cooling zone and air cooling zone, with the strand that is solidified fully;
It is characterized in that: with pulling rate V
cBe controlled at 1.0-1.3m/min; The leptoprosopy hot-fluid of said crystallizer is 0.75-0.85 with the ratio of wide hot-fluid; The dual alkalinity of said covering slag is 1.0-1.15, and viscosity is 0.10-0.25Pas.
2. method according to claim 1, wherein, said wide cooling water inflow is 2900-2950L/min, the cooling water inflow of said leptoprosopy is 360-400L/min.
3. method according to claim 1, wherein, by weight percentage, the composition of said covering slag is: CaO:25%-35%, SiO
2: 27%-37%, Al
2O
3: 1%-12%, MgO:1%-10%, Na
2O:5%-15%, F
-: 1%-10%.
4. method according to claim 3, wherein, the consumption per ton of steel of said covering slag is 0.46-0.55kg/t.
5. method according to claim 1, wherein, the leptoprosopy tapering of said crystallizer is set at 1.0-1.2%/m.
6. method according to claim 1, wherein, during cast, the degree of superheat of molten steel remains on 20-30 ℃.
7. method according to claim 1, wherein, when secondary cooling zone was sprayed water cooling, the specific water was a 0.4-0.55kg/ ton steel.
8. method according to claim 7 wherein, makes the temperature of part of exit position 12-16m of the said crystallizer of distance of said strand remain on 900-1000 ℃.
9. method according to claim 1, wherein, in the molten steel of said steel for automobile crossbeam, N content is 0.003%-0.007%.
10. method according to claim 10, wherein, said steel for automobile crossbeam is 510L or 590L.
11. continuous cast method according to claim 1, wherein, the final size of said strand is 200mm * 1050mm or 200mm * 1080mm or 200mm * 1250mm.
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Cited By (9)
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| CN102732784A (en) * | 2012-06-15 | 2012-10-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | 590L automobile crossbeam steel and CSP preparation method thereof |
| CN103286290A (en) * | 2013-06-18 | 2013-09-11 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling slab high sulfur-containing straight carbon steel triangular area cracks |
| CN105382229A (en) * | 2015-10-23 | 2016-03-09 | 首钢总公司 | Method for improving quality of surface of plate coil |
| CN106345976A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting crystallizer casting powder and continuous casting method of wide and thick slab micro-carbon steel |
| CN106513605A (en) * | 2016-11-16 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving low-carbon aluminum killed steel cold-rolled plate coil peeling |
| CN106984786A (en) * | 2017-04-18 | 2017-07-28 | 攀钢集团西昌钢钒有限公司 | A kind of water-flow control method of continuous cast mold |
| CN110560652A (en) * | 2019-10-16 | 2019-12-13 | 北京首钢股份有限公司 | control method for cracks of special steel casting blank |
| CN111618266A (en) * | 2020-05-26 | 2020-09-04 | 武汉高智达连铸智能科技有限公司 | Method for controlling pulling speed of small square billet |
| CN114523081A (en) * | 2022-02-09 | 2022-05-24 | 天铁热轧板有限公司 | Method for controlling cracks of triangular area of continuous casting plain carbon steel plate blank |
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Cited By (11)
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| CN103286290B (en) * | 2013-06-18 | 2015-08-05 | 攀钢集团攀枝花钢钒有限公司 | A kind of method controlling slab height sulfur-bearing straight carbon steel triangular area crack |
| CN105382229A (en) * | 2015-10-23 | 2016-03-09 | 首钢总公司 | Method for improving quality of surface of plate coil |
| CN106345976A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting crystallizer casting powder and continuous casting method of wide and thick slab micro-carbon steel |
| CN106513605A (en) * | 2016-11-16 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving low-carbon aluminum killed steel cold-rolled plate coil peeling |
| CN106984786A (en) * | 2017-04-18 | 2017-07-28 | 攀钢集团西昌钢钒有限公司 | A kind of water-flow control method of continuous cast mold |
| CN110560652A (en) * | 2019-10-16 | 2019-12-13 | 北京首钢股份有限公司 | control method for cracks of special steel casting blank |
| CN111618266A (en) * | 2020-05-26 | 2020-09-04 | 武汉高智达连铸智能科技有限公司 | Method for controlling pulling speed of small square billet |
| CN114523081A (en) * | 2022-02-09 | 2022-05-24 | 天铁热轧板有限公司 | Method for controlling cracks of triangular area of continuous casting plain carbon steel plate blank |
| CN114523081B (en) * | 2022-02-09 | 2024-03-22 | 天铁热轧板有限公司 | Method for controlling triangular area cracks of continuous casting plain carbon steel plate blank |
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Application publication date: 20120509 |