CN105414512A - Control method of transverse corner cracks of casting blank of chamfering crystallizer - Google Patents
Control method of transverse corner cracks of casting blank of chamfering crystallizer Download PDFInfo
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- CN105414512A CN105414512A CN201510846986.9A CN201510846986A CN105414512A CN 105414512 A CN105414512 A CN 105414512A CN 201510846986 A CN201510846986 A CN 201510846986A CN 105414512 A CN105414512 A CN 105414512A
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- roller
- strand
- chamfer crystallizer
- control method
- transverse corner
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
Abstract
The invention relates to the technical field of continuous casting, in particular to a control method of transverse corner cracks of a casting blank of a chamfering crystallizer. The control method includes the steps that the spraying angle of spray nozzles on a first foot roll, a second foot roll, a third foot roll and a fourth foot roll relative to the casting blank is controlled to range from 95 degrees to 110 degrees; and the water flow of primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L/min to 600 L/min. According to the control method of the transverse corner cracks of the casting blank of the chamfering crystallizer, the spraying angles of the spray nozzles on the first foot roll, the second foot roll, the third foot roll and the fourth foot roll relative to the casting blank are controlled to range from 95 degrees to 110 degrees, the cooling effect of the chamfering portion of the casting blank of the chamfering crystallizer for microalloyed steel can be fully guaranteed, and meanwhile the influence on the following process of the casting blank is avoided; and in addition, the water flow of the primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L/min to 600 L/min, and the transverse corner cracks can be prevented from being generated on the casting blank of the chamfering crystallizer for the microalloyed steel.
Description
Technical field
The present invention relates to continuous casting technology field, particularly a kind of control method of chamfer crystallizer strand transverse corner crack line.
Background technology
The production cost of micro alloyed steel is lower, and micro alloyed steel possesses the premium properties such as good intensity, toughness, formability and weldability simultaneously, is widely used in the industrial production.In micro alloyed steel production process, the cracks of steel side cape defect of slab becomes the key technology difficult problem perplexing domestic and international Ge great steel mill always, especially production carbon content at the typical peritectoid of 0.08% ~ 0.20%, sub-peritectoid class micro alloyed steel time, its incidence of Strip edge fault caused by strand transverse corner crack line, generally more than 5%, even can reach more than 80% time serious.In prior art, the technological approaches that better can solve strand transverse corner crack line is the mould at narrow copper coin technology adopting band chamfering, the target of this technology makes the original right angle of strand change two obtuse angles into, stress in order to eliminate strand bight is concentrated, reach the object improving bight temperature simultaneously, thus effectively control the generation of strand transverse corner crack line.By the technology of Optimal improvements chamfer crystallizer, efficiently solve the strand angle transverse fissure problem of microalloying steel grade.But chamfer crystallizer should also grow some problems, especially the transverse corner crack line problem of chamfering strand has been difficult to solve, and hinders the popularization of chamfer crystallizer.
Summary of the invention
The embodiment of the present invention is by providing a kind of control method of chamfer crystallizer strand transverse corner crack line, solve the unmanageable technical problem of chamfer crystallizer strand transverse corner crack line of micro alloyed steel in prior art, eliminate the transverse corner crack line of chamfer crystallizer strand, improve the quality of strand.
Embodiments provide a kind of control method of chamfer crystallizer strand transverse corner crack line, the leptoprosopy of described chamfer crystallizer is provided with the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller, and described first sufficient roller, the second sufficient roller, tripodia roller and described four-footed roller are for supporting described strand; The gap of described first sufficient roller, the second sufficient roller, tripodia roller and described four-footed roller is provided with nozzle, and described nozzle is used for spraying cooling water to described strand; Described second sufficient roller, tripodia roller and described four-footed roller are provided with disc spring; Described method comprises:
Control described first sufficient roller, the second sufficient roller, tripodia roller and described four-footed roller gap described nozzle be 95 ° ~ 110 ° to the spray angle of described strand.
The discharge controlling the primary cooling water of described chamfer crystallizer leptoprosopy is 520 ~ 600L/min.
Further, also comprise: the approach controlling described second sufficient roller, tripodia roller and described four-footed roller is 2 ~ 4mm.
Further, also comprise: the decrement 1 ~ 2mm increasing the described disc spring on described second sufficient roller, tripodia roller and described four-footed roller.
Further, also comprise: the thickness controlling described strand is 180 ~ 250mm.
Further, also comprise: the water flow velocity controlled in wide tank of described chamfer crystallizer is 7.5 ~ 9.5m/s, the water flow velocity controlled in the leptoprosopy tank of described chamfer crystallizer is 7.3 ~ 9.0m/s.
Further, also comprise: the fluctuating temperature scope controlled in described chamfer crystallizer is 0 ~ 6 DEG C.
Further, also comprise: the water yield controlling to distribute in the leptoprosopy fillet surface of described chamfer crystallizer accounts for 30% ~ 50% of leptoprosopy total Water.
Further, also comprise: the pulling rate controlling described strand is less than or equal to 1.3m/min.
One or more technical schemes that the embodiment of the present invention provides, at least possess following beneficial effect or advantage:
1, the control method of chamfer crystallizer strand transverse corner crack line that provides of the embodiment of the present invention, the nozzle controlling gap on the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller is 95 ° ~ 110 ° to the spray angle of strand, fully can ensure the cooling effect of the chamfer crystallizer strand chamfer site of micro alloyed steel, can not impact the subsequent technique of strand simultaneously.The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the primary cooling water discharge controlling chamfer crystallizer leptoprosopy is 520 ~ 600L/min, can prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
2, the control method of chamfer crystallizer strand transverse corner crack line that provides of the embodiment of the present invention, the approach controlling the second sufficient roller, tripodia roller and four-footed roller is 2 ~ 4mm, strand contraction in downstream can be made up, ensure the support that chamfer crystallizer narrow-face foot roller is good to leptoprosopy strand, prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
3, the control method of chamfer crystallizer strand transverse corner crack line that provides of the embodiment of the present invention, increase the decrement 1 ~ 2mm of the disc spring on the second sufficient roller, tripodia roller and four-footed roller, for increasing the disc spring pretightning force of the sufficient roller of chamfer crystallizer leptoprosopy second, tripodia roller and four-footed roller, thus prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
4, in the control method of chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the thickness controlling strand is 180 ~ 250mm; The water flow velocity controlled in wide tank of chamfer crystallizer is 7.5 ~ 9.5m/s, and the water flow velocity controlled in the leptoprosopy tank of chamfer crystallizer is 7.3 ~ 9.0m/s; The fluctuating temperature scope controlled in chamfer crystallizer is 0 ~ 6 DEG C; The water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer accounts for 30% ~ 50% of leptoprosopy total Water; And the pulling rate controlling strand is less than or equal to the technological means such as 1.3m/min, is all the mode by Optimizing Process Parameters, reach the effect of the chamfer crystallizer strand transverse corner crack line controlling micro alloyed steel.
Accompanying drawing explanation
The control method flow chart of the chamfer crystallizer strand transverse corner crack line that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention is by providing a kind of control method of chamfer crystallizer strand transverse corner crack line, solve the unmanageable technical problem of chamfer crystallizer strand transverse corner crack line of micro alloyed steel in prior art, eliminate the transverse corner crack line of chamfer crystallizer strand, improve the quality of strand.
See Fig. 1, embodiments provide a kind of control method of chamfer crystallizer strand transverse corner crack line, wherein the leptoprosopy of chamfer crystallizer is provided with the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller, and the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller are used for supporting casting blank; The gap of the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller is provided with nozzle, and nozzle is used for spraying cooling water to strand; Second sufficient roller, tripodia roller and four-footed roller are provided with disc spring; The method comprises:
Step 10, control the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller gap nozzle be 95 ° ~ 110 ° (as 95 °, 103 ° or 110 °) to the spray angle of strand.
Strand chamfered part is low because cooling degree in crystallizer, and the strand chamfered part temperature going out crystallization is high, and the intensity in strand bight is low, is easy to produce bight, bight transverse crack, therefore needs the cooling increasing strand bight.In step 10, control the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller gap nozzle be 95 ° ~ 110 ° to the spray angle of strand, fully can ensure the cooling effect of the chamfer crystallizer strand chamfer site of micro alloyed steel, can not impact the subsequent technique of strand simultaneously.
The primary cooling water discharge of step 20, control chamfer crystallizer leptoprosopy is 520 ~ 600L/min (as 520L/min, 560L/min or 600L/min).
Because the cooling degree of chamfer crystallizer leptoprosopy is low, therefore, general steel grade cooling water inflow takes higher value as far as possible, to increase the intensity of strand leptoprosopy.For micro alloyed steel, the cooling of chamfer crystallizer leptoprosopy is different from common steel grade, adopts common existing discharge control method easily to cause strand generation transverse corner crack line.In step 20, the primary cooling water discharge controlling chamfer crystallizer leptoprosopy is 520 ~ 600L/min, can prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
The approach of step 30, control the second sufficient roller, tripodia roller and four-footed roller is 2 ~ 4mm (as 2mm, 3mm or 4mm).
In step 30, the approach controlling the second sufficient roller, tripodia roller and four-footed roller is 2 ~ 4mm, for making up strand contraction in downstream, ensureing the support that chamfer crystallizer narrow-face foot roller is good to leptoprosopy strand, preventing the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
Decrement 1 ~ the 2mm (as 1mm, 1.5mm or 2mm) of the disc spring in step 40, increase the second sufficient roller, tripodia roller and four-footed roller.
In step 40, the decrement increasing the disc spring on the second sufficient roller, tripodia roller and four-footed roller is 1 ~ 2mm, for increasing the disc spring pretightning force of the sufficient roller of chamfer crystallizer leptoprosopy second, tripodia roller and four-footed roller, thus prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
The thickness of step 50, control strand is 180 ~ 250mm (as 180mm, 215mm or 250mm).
Step 60, the water flow velocity controlled in wide tank of chamfer crystallizer are 7.5 ~ 9.5m/s (as 7.5m/s, 8.5m/s or 9.5m/s), and the water flow velocity controlled in the leptoprosopy tank of chamfer crystallizer is 7.3 ~ 9.0m/s (as 7.3m/s, 8.1m/s or 9.0m/s).
Step 70, the fluctuating temperature scope controlled in chamfer crystallizer are 0 ~ 6 DEG C (as 0 DEG C, 3 DEG C or 6 DEG C).
Step 80, the water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer account for 30% ~ 50% (as 30%, 40% or 50%) of leptoprosopy total Water.
The pulling rate of step 90, control strand is less than or equal to 1.3m/min (as 1.0m/min, 1.2m/min or 1.3m/min).
In step 50 ~ step 90, the thickness of the control strand adopted is 180 ~ 250mm; The water flow velocity controlled in wide tank of chamfer crystallizer is 7.5 ~ 9.5m/s, and the water flow velocity controlled in the leptoprosopy tank of chamfer crystallizer is 7.3 ~ 9.0m/s; The fluctuating temperature scope controlled in chamfer crystallizer is 0 ~ 6 DEG C; The water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer accounts for 30% ~ 50% of leptoprosopy total Water; And the pulling rate controlling strand is less than or equal to the technological means such as 1.3m/min, is all the mode by Optimizing Process Parameters, reach the effect of the chamfer crystallizer strand transverse corner crack line controlling micro alloyed steel.
Above-mentioned steps 10, step 20, step 30, step 40, step 50, step 60, step 70, step 80 and step 90 can be carried out in actual applications as required in a certain order, in the present embodiment in no particular order sequentially.
Be described below in conjunction with the control method of specific embodiment to chamfer crystallizer strand transverse corner crack line provided by the invention:
embodiment 1
In the continuous casting process of micro alloyed steel, adopt the control method of chamfer crystallizer strand transverse corner crack line, specifically comprise: the nozzle controlled on the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller is 100 ° to the spray angle of strand.The primary cooling water discharge controlling chamfer crystallizer leptoprosopy is 540L/min.Control the approach 3.5mm of the second sufficient roller, tripodia roller and four-footed roller, increase the decrement 1.3mm of the disc spring on the second sufficient roller, tripodia roller and four-footed roller, the thickness controlling strand is 210mm.The water flow velocity controlled in wide tank of chamfer crystallizer is 8.1m/s, and the fluctuating temperature scope controlled in chamfer crystallizer is 3 DEG C.The water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer accounts for 38% of leptoprosopy total Water, and the pulling rate controlling strand is 1.2m/min.
embodiment 2
In the continuous casting process of micro alloyed steel, adopt the control method of chamfer crystallizer strand transverse corner crack line, specifically comprise: the nozzle controlled on the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller is 107 ° to the spray angle of strand.The primary cooling water discharge controlling chamfer crystallizer leptoprosopy is 586L/min.The approach controlling the second sufficient roller, tripodia roller and four-footed roller is 2.5mm, increases the decrement 1., 5mm of the disc spring on the second sufficient roller, tripodia roller and four-footed roller, and the thickness controlling strand is 225mm.The water flow velocity controlled in wide tank of chamfer crystallizer is 8.5m/s, and the fluctuating temperature scope controlled in chamfer crystallizer is 3.5 DEG C.The water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer accounts for 40% of leptoprosopy total Water, and the pulling rate controlling strand is 1.1m/min.
The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, at least possesses following beneficial effect:
The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the nozzle controlled on the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller is 95 ° ~ 110 ° to the spray angle of strand, fully can ensure the cooling effect of the chamfer crystallizer strand chamfer site of micro alloyed steel, can not impact the subsequent technique of strand simultaneously.The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the primary cooling water discharge controlling chamfer crystallizer leptoprosopy is 520 ~ 600L/min, can prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the approach controlling the second sufficient roller, tripodia roller and four-footed roller is 2 ~ 4mm, strand contraction in downstream can be made up, ensure the support that chamfer crystallizer narrow-face foot roller is good to leptoprosopy strand, prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
The control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the decrement increasing the disc spring on the second sufficient roller, tripodia roller and four-footed roller is 1 ~ 2mm, add the disc spring pretightning force of the sufficient roller of chamfer crystallizer leptoprosopy second, tripodia roller and four-footed roller, thus prevent the chamfer crystallizer strand of micro alloyed steel from producing transverse corner crack line.
In the control method of the chamfer crystallizer strand transverse corner crack line that the embodiment of the present invention provides, the thickness controlling strand is 180 ~ 250mm; The water flow velocity controlled in wide tank of chamfer crystallizer is 7.5 ~ 9.5m/s, and the water flow velocity controlled in the leptoprosopy tank of chamfer crystallizer is 7.3 ~ 9.0m/s; The fluctuating temperature scope controlled in chamfer crystallizer is 0 ~ 6 DEG C; The water yield controlling to distribute in the leptoprosopy fillet surface of chamfer crystallizer accounts for 30% ~ 50% of leptoprosopy total Water; And the pulling rate controlling strand is less than or equal to the technological means such as 1.4m/min, is all the mode by Optimizing Process Parameters, reach the effect of the chamfer crystallizer strand transverse corner crack line controlling micro alloyed steel.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. the control method of a chamfer crystallizer strand transverse corner crack line, the leptoprosopy of described chamfer crystallizer is provided with the first sufficient roller, the second sufficient roller, tripodia roller and four-footed roller, and described first sufficient roller, the second sufficient roller, tripodia roller and described four-footed roller are for supporting described strand; The gap of described first sufficient roller, the second sufficient roller, tripodia roller and described four-footed roller is provided with nozzle, and described nozzle is used for spraying cooling water to described strand; Described second sufficient roller, tripodia roller and described four-footed roller are provided with disc spring;
It is characterized in that, described method comprises:
Control described first sufficient roller, described nozzle that the second sufficient roller, tripodia roller and described four-footed roller gap are arranged is 95 ° ~ 110 ° to the spray angle of described strand;
The discharge controlling the primary cooling water of described chamfer crystallizer leptoprosopy is 520 ~ 600L/min.
2. the control method of chamfer crystallizer strand transverse corner crack line as claimed in claim 1, is characterized in that, also comprise: the approach controlling described second sufficient roller, tripodia roller and described four-footed roller is 2 ~ 4mm.
3. the control method of chamfer crystallizer strand transverse corner crack line as claimed in claim 2, is characterized in that, also comprise: the decrement 1 ~ 2mm increasing the described disc spring on described second sufficient roller, tripodia roller and described four-footed roller.
4. the control method of the chamfer crystallizer strand transverse corner crack line as described in any one of claims 1 to 3, is characterized in that, also comprise: the thickness controlling described strand is 180 ~ 250mm.
5. the control method of chamfer crystallizer strand transverse corner crack line as claimed in claim 1, it is characterized in that, also comprise: the water flow velocity controlled in wide tank of described chamfer crystallizer is 7.5 ~ 9.5m/s, the water flow velocity controlled in the leptoprosopy tank of described chamfer crystallizer is 7.3 ~ 9.0m/s.
6. the control method of the chamfer crystallizer strand transverse corner crack line as described in any one of claims 1 to 3, is characterized in that, also comprise: the fluctuating temperature scope controlled in described chamfer crystallizer is 0 ~ 6 DEG C.
7. the control method of the chamfer crystallizer strand transverse corner crack line as described in any one of claims 1 to 3, is characterized in that, also comprise: the water yield controlling to distribute in the leptoprosopy fillet surface of described chamfer crystallizer accounts for 30% ~ 50% of leptoprosopy total Water.
8. the control method of chamfer crystallizer strand transverse corner crack line as claimed in claim 1, is characterized in that, also comprise: the pulling rate controlling described strand is less than or equal to 1.3m/min.
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| 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 |
| CN108580817A (en) * | 2018-05-08 | 2018-09-28 | 攀钢集团西昌钢钒有限公司 | A kind of slab caster casting process |
| CN111069554A (en) * | 2019-12-13 | 2020-04-28 | 河钢乐亭钢铁有限公司 | Online thermal width adjusting method for continuous casting chamfering crystallizer |
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| CN111069554A (en) * | 2019-12-13 | 2020-04-28 | 河钢乐亭钢铁有限公司 | Online thermal width adjusting method for continuous casting chamfering crystallizer |
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Application publication date: 20160323 |