CN104014753A - Method for producing continuous casting blanks by using near-net-shape profiled blank continuous casting machine - Google Patents
Method for producing continuous casting blanks by using near-net-shape profiled blank continuous casting machine Download PDFInfo
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- CN104014753A CN104014753A CN201410284643.3A CN201410284643A CN104014753A CN 104014753 A CN104014753 A CN 104014753A CN 201410284643 A CN201410284643 A CN 201410284643A CN 104014753 A CN104014753 A CN 104014753A
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Abstract
The invention discloses a method for producing continuous casting blanks by using a near-net-shape profiled blank continuous casting machine. Two water gaps are used for pouring in each process. The method comprises the following steps: opening a tundish water gap corresponding to a low pouring point of a crystallizer; arranging a swinging tank at the low pouring point of the crystallizer when the distance from liquid level of steel liquid in the crystallizer to the upper edge of the crystallizer is 345mm-355mm and adding spruing slag with the thickness being 10mm-20mm into the crystallizer; laying out the swinging tank when the time for arranging the swinging tank is 20 seconds-30 seconds; adding protection slag with thickness being 25mm-40mm into the crystallizer when the distance from the liquid level of the steel liquid in the crystallizer to the upper edge of the crystallizer is 245mm-255mm and starting jiggering; adjusting the distance from the liquid level of the steel liquid in the crystallizer to the lower edge of the crystallizer to 400mm-410mm after jiggering for 60 seconds-90 seconds; opening a tundish water gap corresponding to a high pouring point of the crystallizer and adjusting the distance from the liquid level of the steel liquid in the crystallizer to the lower edge of the crystallizer to 535mm-545mm along with the increase of the liquid level of the steel liquid. The method is capable of effectively reducing the problems of steel overflow and steel leakage in the pouring process.
Description
Technical field
The invention belongs to casting for shaped blank continuous technical field, specifically, relate to a kind of method of producing continuous casting billet with near finish shape billet continuous casting machine.
Background technology
Conventionally, Development of Near-net-shape Continuous Casting For Beam Blank can directly be produced required steel section configuration or approach the continuous casting billet of finished steel shape, for example, and the continuous casting billet of H type, quadrangle, regular hexagon and circle base equal section.But because the solidification and contraction coefficient of steel is larger, thereby Development of Near-net-shape Continuous Casting For Beam Blank is mainly produced the continuous casting billet of H type section.The continuous casting billet that utilizes Development of Near-net-shape Continuous Casting For Beam Blank to produce H type section not only can reduce the rolling workload of open rolling machine, but also can save rolling and heating energy consumption, improves cc billet surface quality.
But in the process of the continuous casting billet of casting H type section, due to casting section complexity, pour point is many, the belly of the continuous casting billet of H type section and the feature such as alar part wooden partition is thinner, makes tundish open casting operation difficulty large, centre unwraps that to water success rate lower.In addition, casting process is prone to the problems such as excessive steel, bleed-out, thereby affects the quality of the continuous casting billet of H type section.
Summary of the invention
One object of the present invention is to provide a kind of method of producing continuous casting billet with near finish shape billet continuous casting machine that reduces the problem such as excessive steel, bleed-out in casting process.
Another object of the present invention is unwrapped the method for producing continuous casting billet with near finish shape billet continuous casting machine of watering success rate in the middle of being to provide a kind of raising.
According to method of producing continuous casting billet with near finish shape billet continuous casting machine of the present invention, each stream adopts two mouths of a river to pour into a mould, described method comprises the steps: to open the middle water containing opening corresponding with the low level pour point of crystallizer, so that molten steel is injected into crystallizer from tundish; When the molten steel liquid level in crystallizer is apart from crystallizer during along 345mm～355mm, put groove to stop injecting molten steel in crystallizer at the low level pour point place of crystallizer, and be the pouring slag of 10mm～20mm to adding thickness in crystallizer; When putting the time of groove while reaching 20s～30s, arrange pendulum groove, so that molten steel re-injects in crystallizer; When the molten steel liquid level in crystallizer is apart from crystallizer during along 245mm～255mm, be the covering slag of 25mm～40mm to adding thickness in crystallizer, and start throwing; After throwing 60s～90s, the distance between edge under Mold liquid level and crystallizer is adjusted into 400mm～410mm; Thereby open the middle water containing opening corresponding with the high-order pour point of crystallizer and pour into a mould low level pour point and high-order pour point simultaneously, and along with the rising of molten steel liquid level, the distance between edge under Mold liquid level and crystallizer is adjusted into 535mm～545mm; Wherein, low level pour point refers on crystallizer along to the large side of the distance between dummy bar head, and the position corresponding with middle water containing opening; High-order pour point refers on crystallizer along to the little side of the distance between dummy bar head, and the position corresponding with middle water containing opening.
According to one embodiment of present invention, described method also comprises: in the time that the time of putting groove reaches 20s～30s, arrange after groove, the first funnel is set on the crystallizer corresponding with low level pour point.
According to one embodiment of present invention, described method also comprises: before opening the middle water containing opening corresponding with the high-order pour point of crystallizer, the second funnel is set on the crystallizer corresponding with high-order pour point.
According to one embodiment of present invention, crystallizer comprises the first alar part, the second alar part, flap portion, the 4th alar part and web portion, the first alar part and flap portion are positioned at one end of web portion, the second alar part and the 4th alar part are positioned at the other end of web portion, the first alar part and the second alar part are positioned at a side of web portion, flap portion and the 4th alar part are positioned at the opposite side of web portion, a side near the first alar part and flap portion is high-order pour point, is low level pour point near a side of the second alar part and the 4th alar part.
According to one embodiment of present invention, add pouring slag in crystallizer time, according to the order of the first alar part, flap portion, high-order pour point and web portion, pouring slag is joined in crystallizer.
According to one embodiment of present invention, add covering slag in crystallizer time, according to the order of the first alar part, flap portion, web portion, the second alar part and the 4th alar part, covering slag is joined in crystallizer.
According to one embodiment of present invention, reach in the process of 20s～30s in the time of putting groove, in the time that the temperature of tundish is equal to or less than 1565 DEG C, control after the time of putting groove is 20s, arrange pendulum groove; When the temperature of tundish is during higher than 1565 DEG C, control after the time of putting groove is 30s, arrange pendulum groove.
According to one embodiment of present invention, described method also comprises: before starting throwing, and the bonding situation of the base shell forming in detection crystallizer chamber and the inwall of crystallizer.
According to one embodiment of present invention, described method also comprises: open the middle water containing opening corresponding with the low level pour point of crystallizer and open with the corresponding middle water containing opening of the high-order pour point of crystallizer before, put groove at low level pour point place and high-order pour point place and in crystallizer, inject molten steel to stop, round and smooth when full when the molten steel beam flowing out from tundish, arrange groove so that round and smooth full molten steel beam is injected in crystallizer.
According to one embodiment of present invention, near finish shape billet continuous casting machine is that three machines three flow near finish shape billet continuous casting machine, and first pour into a mould the stream time of tundish both sides, after the low level pour point of the stream of tundish both sides time and high-order pour point are poured into a mould, start to pour into a mould intermediate flow simultaneously.
According to method of producing continuous casting billet with near finish shape billet continuous casting machine of the present invention, can effectively reduce in casting process and to occur the problems such as steel, bleed-out of overflowing, thereby improve the quality of continuous casting billet, for example, occurred that the ratio of the problems such as excessive steel, bleed-out has reduced by 50%～60%.In addition, the operational stability of method of the present invention is good, can improve opening of tundish and water success rate, and for example, centre is unwrapped and watered success rate and improved 30%～40%.
Brief description of the drawings
By the description to embodiment of carrying out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 shows the section structure schematic diagram of the crystallizer of near finish shape billet continuous casting machine;
Fig. 2 shows the crystallizer of the near finish shape billet continuous casting machine shown in Fig. 1 along the sectional structure schematic diagram of A-A line intercepting.
Detailed description of the invention
Below will be by describing embodiment with reference to accompanying drawing, to explain the present invention.But the present invention can implement with multiple different form, should not be understood to be confined to the exemplary embodiment in this proposition.It will be openly thorough with completely providing these embodiment to make of the present invention, and scope of the present invention is conveyed to those skilled in the art fully.
According to method of producing continuous casting billet with near finish shape billet continuous casting machine of the present invention, each stream adopts two mouths of a river to pour into a mould, and the method comprises: first, and the low level pour point of casting crystallizer; Afterwards, more simultaneously high-order pour point and the low level pour point of casting crystallizer.
In the present invention, as shown in Figure 2, according to the difference of the structure of the dummy bar head 3 as crystallizer 1 bottom (left end 32 of dummy bar head is higher than the height of right-hand member 31), thereby the pour point of crystallizer 1 is divided into low level pour point and high-order pour point,, low level pour point refers on crystallizer 1 along to the large side of the distance between dummy bar head 3, and the position 11 corresponding with one of them mouth of a river (first mouth of a river); High-order pour point refers on crystallizer 1 along to the little side of the distance between dummy bar head 3, and the position 12 corresponding with another mouth of a river (second mouth of a river).
According to one embodiment of present invention, as shown in Figure 1, the crystallizer 1 (H type) adopting comprises the first alar part 13, the second alar part 14, flap portion 15, the 4th alar part 16 and web portion 17, the first alar part 13 and flap portion 15 are positioned at one end (left end) of web portion 17, the second alar part 14 and the 4th alar part 16 are positioned at the other end (right-hand member) of web portion 17, the first alar part 13 and the second alar part 14 are positioned at a side (upside) of web portion 17, flap portion 15 and the 4th alar part 16 are positioned at the opposite side (downside) of web portion 17, a side near the first alar part 13 and flap portion 15 is high-order pour point 12, a side near the second alar part 14 and the 4th alar part 16 is low level pour point 11.
In the technique of the low level pour point 11 of casting crystallizer 1, first, open the middle water containing opening corresponding with the low level pour point 11 of crystallizer 1, i.e. the first mouth of a river (not shown), so that molten steel is injected into crystallizer 1 from tundish.According to one embodiment of present invention, in the time opening the middle water containing opening corresponding with the low level pour point 11 of crystallizer 1, can put pendulum groove at low level pour point place, in crystallizer 1, inject molten steel to stop, round and smooth when full when the molten steel beam flowing out from tundish, arrange groove so that round and smooth full molten steel beam is injected in crystallizer 1.
In a non-limiting example, can adopt automatic casting mode to open first mouth of a river; If can not automatic casting, can adopt the mode of burning oxygen drainage to open first mouth of a river.For example, put after groove at the low level pour point place of crystallizer 1, the first mouth of a river automatic casting of tundish, molten steel enters overflow launder by pendulum concentrated flow, round and smooth when full when molten steel beam, arranges pendulum groove, and round and smooth full molten steel beam is injected in crystallizer.If molten steel flows to the time of pendulum groove while reaching 30s, molten steel beam is diffusing or bias current still, need to change immediately the slide block that is connected with tundish upper nozzle (in addition, in casting process, can regulate molten steel to flow into the speed of crystallizer from tundish by the slide block of changing different pore size, thereby play the effect of pulling rate of regulating), be injected in crystallizer after full until molten steel beam is round and smooth.Cannot automatic casting if first mouth of a river of tundish continues after 20s still, can adopt the mode of burning oxygen drainage to open first mouth of a river.
Then, when the molten steel liquid level in crystallizer 1 is apart from crystallizer 1 during along 345mm～355mm, put pendulum groove at low level pour point 11 places of crystallizer 1, and be the pouring slag of 10mm～20mm to adding thickness in crystallizer.In non-limiting example of the present invention, pouring slag can be the covering slag that the molten steel in crystallizer is played to adiabatic heat-insulation, isolated air.Owing to pouring slag being joined in crystallizer in this stage, pouring slag burn-off rate is fast, absorbs heat few, therefore, is conducive to increase the lubricant effect between base shell and the crystallizer inwall forming in crystallizer.
In one embodiment of the invention, can pouring slag be joined in crystallizer 1 according to the order of the first alar part 13, flap portion 15, high-order pour point 12 and web portion 17.Add pouring slag can reduce the slag causing because of molten steel liquid fluctuating according to this order, thereby preventing from opening water bleed-out.
Afterwards, when putting the time of groove while reaching 20s～30s, arrange pendulum groove, so that molten steel re-injects in crystallizer.In this step, the molten steel that can put in the time crystallization control device chamber of groove by adjustment forms the thickness of base shell, thereby avoids occurring that bleed-out causes the problems such as slab quality while going out crystallizer because of strand.In one embodiment of the invention, in the time that the temperature of tundish is equal to or less than 1565 DEG C, can control after the time of putting groove is 20s, arrange pendulum groove, so that molten steel re-injects in crystallizer; When the temperature of tundish is during higher than 1565 DEG C, can control after the time of putting groove is 30s, arrange pendulum groove, so that molten steel re-injects in crystallizer.
For the molten steel liquid level in stable crystalline device and the molten steel that prevents from entering in crystallizer are involved in pouring slag, can reach 20s～30s when the time of putting groove, arrange after groove, on the corresponding crystallizer 1 of low level pour point 11, the first funnel 21 is set, molten steel is incorporated in crystallizer 1 by the first funnel 21.Preferably, the first funnel 21 can be inserted into below the 250mm in crystallizer.
Afterwards, when the molten steel liquid level in crystallizer 1 is apart from crystallizer 1 during along 245mm～255mm, be the covering slag of 25mm～40mm to adding thickness in crystallizer, and start throwing (starting withdrawal straightening machine and mould vibration device).According to one embodiment of present invention, can covering slag be joined in crystallizer 1 according to the order of the first alar part 13, flap portion 15, web portion 17, the second alar part 14 and the 4th alar part 16.Add covering slag can ensure that the even thickness that joins the covering slag in crystallizer is without dead angle according to this order; improve the lubricant effect of covering slag, thereby avoided the molten steel slag excessive caused because of the local thickness of covering slag or caused bonding steel leakage accident because of too small the caused base shell insufficient lubrication of local thickness of covering slag.
In an embodiment of the present invention, in order to ensure not occur bleed-out situation can also starting throwing in process of billet withdrawal, before starting withdrawal straightening machine and mould vibration device, the bonding situation of the base shell forming in detection crystallizer chamber and the inwall of crystallizer.For example, can utilize iron wire to be inserted into the 5cm～10cm place below crystallizer molten steel liquid level, detect the bonding situation of crystallizer inwall and base shell.
Then,, after throwing 60s～90s, the distance between interior crystallizer 1 molten steel liquid level and 1 time edge of crystallizer is adjusted into 400mm～410mm.
Finally, in the time that the distance between the interior molten steel liquid level of crystallizer 1 and 1 time edge of crystallizer is adjusted into 400mm～410mm, start the high-order pour point 12 of casting crystallizer 1, that is, pour into a mould low level pour point 11 and high-order pour point 12 simultaneously.First, open the mouth of a river corresponding with the high-order pour point 12 of crystallizer 1, i.e. the second mouth of a river (not shown), so that molten steel is injected into crystallizer from tundish.According to one embodiment of present invention, in the time opening the middle water containing opening corresponding with the high-order pour point 12 of crystallizer 1, can put at high-order pour point 12 places groove and in crystallizer, inject molten steel to stop, round and smooth when full when the molten steel beam flowing out from tundish, arrange groove so that round and smooth full molten steel beam is injected in crystallizer.
In one embodiment of the invention; for the molten steel liquid level in stable crystalline device 1 and the molten steel that prevents from entering in crystallizer 1 are involved in pouring slag and covering slag; before opening the middle water containing opening corresponding with the high-order pour point 12 of crystallizer 1; the second funnel 22 is set on the crystallizer 1 corresponding with high-order pour point 12, molten steel is incorporated in crystallizer 1 by the second funnel 22.Preferably, the second funnel 22 can be inserted into below the 250mm in crystallizer.
In order to reduce pulling rate fluctuation, need to, along with the rising of molten steel liquid level, the distance between the molten steel liquid level in crystallizer 1 and 1 time edge of crystallizer be adjusted into 535mm～545mm, thereby low level pour point and high-order pour point are poured into a mould simultaneously.
In non-limiting example of the present invention, can utilize automatic control of liquid level system to monitor the molten steel liquid level in crystallizer, thereby adjust the height of the molten steel liquid level in crystallizer.For example, the height of the molten steel liquid level of setting to the input of automatic control of liquid level system, automatic control of liquid level system is by regulating casting speed, thus the height of the molten steel liquid level in adjustment crystallizer.
According to embodiments of the invention, near finish shape billet continuous casting machine can be that three machines three flow near finish shape billet continuous casting machine, and in the time of cast, first pours into a mould the stream of tundish both sides, after the low level pour point of the stream of tundish both sides time and high-order pour point are poured into a mould simultaneously, start to pour into a mould intermediate flow.In the time that the each stream of cast is inferior, all adopt the first low level pour point 11 of casting crystallizer, the low level pour point 11 of casting crystallizer and the method for high-order pour point 12 are poured into a mould simultaneously more afterwards.
According to method of producing continuous casting billet with near finish shape billet continuous casting machine of the present invention, can effectively reduce in casting process and to occur the problems such as steel, bleed-out of overflowing, thereby improve the quality of continuous casting billet, for example, occurred that the ratio of the problems such as excessive steel, bleed-out has reduced by 50%～60%.
In addition, the operational stability of method of the present invention is good, can improve opening of tundish and water success rate, and for example, centre is unwrapped and watered success rate and improved 30%～40%.
More than describe the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (10)
1. produce a method for continuous casting billet with near finish shape billet continuous casting machine, each stream adopts two mouths of a river to pour into a mould, and described method comprises the steps:
Open the middle water containing opening corresponding with the low level pour point of crystallizer, so that molten steel is injected into crystallizer from tundish;
When the molten steel liquid level in crystallizer is apart from crystallizer during along 345mm～355mm, put groove to stop injecting molten steel in crystallizer at the low level pour point place of crystallizer, and be the pouring slag of 10mm～20mm to adding thickness in crystallizer;
When putting the time of groove while reaching 20s～30s, arrange pendulum groove, so that molten steel re-injects in crystallizer;
When the molten steel liquid level in crystallizer is apart from crystallizer during along 245mm～255mm, be the covering slag of 25mm～40mm to adding thickness in crystallizer, and start throwing;
After throwing 60s～90s, the distance between edge under Mold liquid level and crystallizer is adjusted into 400mm～410mm;
Thereby open the middle water containing opening corresponding with the high-order pour point of crystallizer and pour into a mould low level pour point and high-order pour point simultaneously, and along with the rising of molten steel liquid level, the distance between edge under the molten steel liquid level in crystallizer and crystallizer is adjusted into 535mm～545mm;
Wherein, low level pour point refers on crystallizer along to the large side of the distance between dummy bar head, and the position corresponding with middle water containing opening; High-order pour point refers on crystallizer along to the little side of the distance between dummy bar head, and the position corresponding with middle water containing opening.
2. method according to claim 1, wherein, described method also comprises: in the time that the time of putting groove reaches 20s～30s, arrange after groove, the first funnel is set on the crystallizer corresponding with low level pour point.
3. method according to claim 1, wherein, described method also comprises: before opening the middle water containing opening corresponding with the high-order pour point of crystallizer, the second funnel is set on the crystallizer corresponding with high-order pour point.
4. method according to claim 1, wherein, crystallizer comprises the first alar part, the second alar part, flap portion, the 4th alar part and web portion, the first alar part and flap portion are positioned at one end of web portion, the second alar part and the 4th alar part are positioned at the other end of web portion, the first alar part and the second alar part are positioned at a side of web portion, flap portion and the 4th alar part are positioned at the opposite side of web portion, a side near the first alar part and flap portion is high-order pour point, is low level pour point near a side of the second alar part and the 4th alar part.
5. method according to claim 4, wherein, add pouring slag in crystallizer time, joins pouring slag in crystallizer according to the order of the first alar part, flap portion, high-order pour point and web portion.
6. method according to claim 4, wherein, add covering slag in crystallizer time, joins covering slag in crystallizer according to the order of the first alar part, flap portion, web portion, the second alar part and the 4th alar part.
7. method according to claim 1, wherein, reaches in the process of 20s～30s in the time of putting groove, in the time that the temperature of tundish is equal to or less than 1565 DEG C, controls after the time of putting groove is 20s, arranges pendulum groove; When the temperature of tundish is during higher than 1565 DEG C, control after the time of putting groove is 30s, arrange pendulum groove.
8. method according to claim 1, wherein, described method also comprises: before starting throwing, the bonding situation of the base shell forming in detection crystallizer chamber and the inwall of crystallizer.
9. method according to claim 1, wherein, described method also comprises: open the middle water containing opening corresponding with the low level pour point of crystallizer and open with the corresponding middle water containing opening of the high-order pour point of crystallizer before, put groove at low level pour point place and high-order pour point place and in crystallizer, inject molten steel to stop, round and smooth when full when the molten steel beam flowing out from tundish, arrange groove so that round and smooth full molten steel beam is injected in crystallizer.
10. method according to claim 1, wherein, near finish shape billet continuous casting machine is that three machines three flow near finish shape billet continuous casting machine, and first pours into a mould the stream of tundish both sides, after the low level pour point of the stream of tundish both sides time and high-order pour point are poured into a mould simultaneously, start to pour into a mould intermediate flow.
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| CN114799102A (en) * | 2022-05-24 | 2022-07-29 | 山东莱钢永锋钢铁有限公司 | Method for preventing manual swinging and turning of casting machine |
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