CN104607609A - Secondary cooling nozzle arranging method for improving surface plasticity of casting blank and secondary cooling control method - Google Patents
Secondary cooling nozzle arranging method for improving surface plasticity of casting blank and secondary cooling control method Download PDFInfo
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- CN104607609A CN104607609A CN201510097887.5A CN201510097887A CN104607609A CN 104607609 A CN104607609 A CN 104607609A CN 201510097887 A CN201510097887 A CN 201510097887A CN 104607609 A CN104607609 A CN 104607609A
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Abstract
The invention relates to a secondary cooling nozzle arranging method for improving surface plasticity of a casting blank and a secondary cooling control method. In the secondary cooling nozzle arranging method, wide nozzles and narrow nozzles are formed in the vertical section of a continuous casting machine, and the wide nozzles and the narrow nozzles are controlled by independent loops respectively; after a continuous casting blank is discharged from a crystallizer, by the secondary cooling nozzle arranging method, the casting blank is forcibly cooled with the amount of secondary cooling water of 15-40m<3>/ h to rapidly reduce the surface temperature of the casting blank to below 750 DEG C; narrow corner nozzles and wide corner nozzles in a lower area of the vertical section are closed to rapidly raise the surface temperature of the casting blank to about 1100 DEG C, and from the bent section to the horizontal section, a conventional cooling mode is adopted with the amount of the secondary cooling water of 2-10m<3>/ h. In the secondary cooling nozzle arranging method, the changing course of the surface temperature of the casting blank enables the surface tissue of the casting blank to experience once heat treatment, so that the surface tissue of the casting blank is greatly thinned; after rewarming, a dense austenitic tissue is formed on the surface of the casting blank, the precipitation amount of a grain boundary ferrite film is inhibited at the same time, and the high-temperature plasticity of the surface of the casting blank is radically improved.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of the di-cold spray nozzle method for arranging and the secondary cooling scheme method that improve casting billet surface plasticity.
Background technology
In continuous casting production process, slab surface crack defect annoyings metallargist both domestic and external all the time, each associating institution of higher learning of manufacturing enterprise and scientific research institution have carried out a large amount of research work for this problem, define the control measure being suitable for respective enterprise, inhibit the generation of continuous casting billet surface crack defect well.
Through large quantity research, metallargist proposes the conventional method alleviating micro alloyed steel transverse corner crack line defect---avoid the brittle temperature zone of micro alloyed steel, the method comprises " heat row " and " cold row " two kinds of thinkings.So-called " heat row " is exactly the surface temperature of the method raising strand by taking to weaken secondary cooling water, make strand through straightening section casting blank surface temperature higher than the brittle temperature zone upper limit." cold row " is exactly that cooling twice adopts strong cold measure to reduce casting blank surface temperature lower than brittleness temperature lower limit, these two kinds of methods all can make strand avoid brittle temperature range through aligning district surface temperature, improve aligning district strand plasticity to a certain extent, alleviate micro alloyed steel transverse corner crack line occurrence probability, but be difficult to accomplish to eliminate completely.This is mainly because casting blank surface temperature in actual continuous casting production process distributes on cross section and uneven, especially strand bight belongs to two dimension cooling, its temperature is significantly lower than other position, and in thus producing, casting blank surface temperature is difficult to the brittle temperature zone avoiding steel completely.Based on above technological deficiency, researcher is had again to propose the control measure of band chamfer crystallizer.Strand bight Two-Dimensional Heat is converted into the heat transfer type of fillet surface, these technical measures improve strand transverse corner crack line defect to a great extent.But its improvement effect for the transverse crack departing from bight is not enough, fail thoroughly to eliminate the transverse crack defect of strand folding corner region.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of the di-cold spray nozzle method for arranging and the secondary cooling scheme method that improve casting billet surface plasticity, the method can effective refinement continuous casting billet textura epidermoidea crystal grain, in suppression phase transition process, ferrite film is at the pick-up behavior of austenite grain boundary, improve continuous casting billet high-temp plastic, thus eliminate slab surface crack defect common in continuous casting production process.
For achieving the above object, the invention provides following technical scheme:
Improve a di-cold spray nozzle method for arranging for casting billet surface plasticity, arrange wide nozzle and leptoprosopy nozzle at conticaster vertical section, nozzle is by odd even row interlaced arrangement, different with width dimensions according to slab thickness, and the quantity of nozzle is different; Wide nozzle and leptoprosopy nozzle adopt independent loop to control respectively.
Improve a secondary cooling scheme method for casting billet surface plasticity, in the method, comprise the following steps:
Step one: after continuous casting billet goes out crystallizer, utilizes above-mentioned di-cold spray nozzle arrangement, first carries out pressure cooling to strand, casting blank surface temperature is down to less than 750 DEG C fast; Step 2: close vertical section lower area leptoprosopy and wide bight nozzle subsequently, about making casting blank surface temperature fast temperature rising to 1100 DEG C.
Further, in step one, secondary cooling water is 15 ~ 40m
3/ h.In step 2, bending section to horizontal segment takes conventional chilling pattern, and secondary cooling water is 2 ~ 10m
3/ h.
Casting blank surface temperature change course makes blank surface tissue experienced by once " heat treatment ", and blank surface tissue obtains significantly refinement.After rising again, blank surface forms fine and close austenite structure, inhibits the amount of precipitation of grain boundary ferrite film simultaneously, fundamentally improves the high-temp plastic of blank surface.
Beneficial effect of the present invention is: the present invention, by the optimization of cooling twice system, suppresses ferrite film at the pick-up behavior of austenite grain boundary, improves the high-temp plastic on online continuous casting billet top layer, fundamentally eliminate slab surface crack defect.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is straight circular-arc type continuous casting machine schematic diagram;
Fig. 2 is di-cold spray nozzle arrangement schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is straight circular-arc type continuous casting machine schematic diagram, and as shown in the figure, this straight circular-arc type continuous casting machine is divided into vertical section, bending section, segmental arc, straightening section and horizontal segment.Di-cold spray nozzle method for arranging of the present invention is applicable to all with the conticaster type of vertical section, and arrangement schematic diagram as shown in Figure 2.
Described di-cold spray nozzle method for arranging is as follows: arrange wide nozzle and leptoprosopy nozzle at conticaster vertical section, and nozzle is by odd even row interlaced arrangement, different with width dimensions according to slab thickness, the quantity difference of nozzle; Wide nozzle and leptoprosopy nozzle adopt independent loop to control respectively.
Meanwhile, adopt above-mentioned di-cold spray nozzle method for arranging as follows to the secondary cooling scheme method improving casting billet surface plasticity: in the method, to comprise the following steps:
Step one: after continuous casting billet goes out crystallizer, utilizes above-mentioned di-cold spray nozzle arrangement, first carries out pressure cooling to strand, casting blank surface temperature is down to less than 750 DEG C fast; Step 2: close vertical section lower area leptoprosopy and wide bight nozzle subsequently, about making casting blank surface temperature fast temperature rising to 1100 DEG C.
Further, in step one, secondary cooling water is 15 ~ 40m
3/ h.In step 2, bending section to horizontal segment takes conventional chilling pattern, and secondary cooling water is 2 ~ 10m
3/ h.
In the method, casting blank surface temperature change course makes blank surface tissue experienced by once " heat treatment ", and blank surface tissue obtains significantly refinement.After rising again, blank surface forms fine and close austenite structure, inhibits the amount of precipitation of grain boundary ferrite film simultaneously, fundamentally improves the high-temp plastic of blank surface.
Illustrate below by specific embodiment:
Embodiment 1:
It is 190mm × 1650mm strand that certain steel mill adopts vertical curve type conticaster to produce section, producing steel grade is straight carbon steel Q235, pulling rate is 1.1m/min, conventional two cold specific waters are 0.6L/kg, by transforming its vertical section arrangement of nozzles mode, and wide for this region and leptoprosopy two cold loop are transformed into independent control model, and nozzle is full (operating) water nozzle.Strand after going out crystallizer wide cooling water flow be 25m
3/ h, leptoprosopy cooling water flow is 8m
3/ h.
In production process, first by the online slab surface crack situation of manual observation, the method then adopting scafing and hot acid to invade corrosion after slab cooling detects slab surface crack, does not all find slab surface crack.
Embodiment 2:
It is 230mm × 1870mm strand that certain steel mill adopts vertical curve type conticaster to produce section, and producing steel grade is straight carbon steel Q345, and pulling rate is 0.95m/min, and conventional two cold specific waters are 0.7L/kg, strand after going out crystallizer wide cooling water flow be 28m
3/ h, leptoprosopy cooling water flow is 10m
3/ h.
The method that strand adopts hot acid to invade corrosion after rolling off the production line and cooling detects slab surface crack, does not find slab surface crack defect.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (4)
1. improve a di-cold spray nozzle method for arranging for casting billet surface plasticity, it is characterized in that: arrange wide nozzle and leptoprosopy nozzle at conticaster vertical section, nozzle is by odd even row interlaced arrangement, different with width dimensions according to slab thickness, and the quantity of nozzle is different; Wide nozzle and leptoprosopy nozzle adopt independent loop to control respectively.
2. adopt a secondary cooling scheme method for the raising casting billet surface plasticity of the method for arranging of di-cold spray nozzle described in claim 1, it is characterized in that: in the method, comprise the following steps:
Step one: after continuous casting billet goes out crystallizer, utilizes the di-cold spray nozzle arrangement described in claim 1, first carries out pressure cooling to strand, casting blank surface temperature is down to less than 750 DEG C fast;
Step 2: close vertical section lower area leptoprosopy and wide bight nozzle subsequently, about making casting blank surface temperature fast temperature rising to 1100 DEG C.
3. secondary cooling scheme method according to claim 2, is characterized in that: in step one, and secondary cooling water is 15 ~ 40m
3/ h.
4. secondary cooling scheme method according to claim 2, is characterized in that: in step 2, and bending section to horizontal segment takes conventional chilling pattern, and secondary cooling water is 2 ~ 10m
3/ h.
Priority Applications (1)
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| CN201510097887.5A CN104607609A (en) | 2015-03-05 | 2015-03-05 | Secondary cooling nozzle arranging method for improving surface plasticity of casting blank and secondary cooling control method |
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| CN201510097887.5A CN104607609A (en) | 2015-03-05 | 2015-03-05 | Secondary cooling nozzle arranging method for improving surface plasticity of casting blank and secondary cooling control method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344960A (en) * | 2015-11-26 | 2016-02-24 | 首钢京唐钢铁联合有限责任公司 | Method for increasing casting speed of chamfering crystallizer |
| CN107881289A (en) * | 2017-10-23 | 2018-04-06 | 苏州大学 | A kind of method for improving steel high-temp plastic |
| CN107983926A (en) * | 2017-12-29 | 2018-05-04 | 南京钢铁股份有限公司 | A kind of billet caster di-cold spray nozzle and its method for arranging |
| CN108213367A (en) * | 2016-12-15 | 2018-06-29 | 株式会社Posco | The uniform austenitic stainless steel continuous cast method of water distribution of secondary cooling platform |
| CN108393456A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of Q345B slabs continuous casting billet structure control method |
| CN115090847A (en) * | 2022-05-31 | 2022-09-23 | 天津钢铁集团有限公司 | Spraying cooling control system and control method for corner of plate blank after being discharged from crystallizer |
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| JPS5711757A (en) * | 1980-06-26 | 1982-01-21 | Nippon Steel Corp | Secondary cooling method in continuous casting of steel |
| CN101138785A (en) * | 2007-10-19 | 2008-03-12 | 攀钢集团攀枝花钢铁研究院 | Method of continuous casting of cogged ingot |
| CN102380597A (en) * | 2011-10-28 | 2012-03-21 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water spraying width during continuous casting of plate blank |
| CN102861890A (en) * | 2012-09-19 | 2013-01-09 | 中冶南方工程技术有限公司 | Secondary cooling method for reducing transverse cracks of corners of microalloy sheet billet |
| CN103008594A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Method for removing transverse corner cracks of extremely thick continuous casting billet |
| CN202894256U (en) * | 2012-02-10 | 2013-04-24 | 河北钢铁集团有限公司 | A two-cooling zone slab spray frame allowing spray width to be adjusted |
| CN103464708A (en) * | 2013-09-06 | 2013-12-25 | 上海宝锋工程技术有限公司 | Secondary cooling nozzle arranging method for silicon steel slab continuous casting |
| CN203791595U (en) * | 2014-02-12 | 2014-08-27 | 宝钢工程技术集团有限公司 | Fan-shaped section suitable for high-quality slab continuous casting production |
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2015
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| JPS5711757A (en) * | 1980-06-26 | 1982-01-21 | Nippon Steel Corp | Secondary cooling method in continuous casting of steel |
| CN101138785A (en) * | 2007-10-19 | 2008-03-12 | 攀钢集团攀枝花钢铁研究院 | Method of continuous casting of cogged ingot |
| CN102380597A (en) * | 2011-10-28 | 2012-03-21 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water spraying width during continuous casting of plate blank |
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| CN103008594A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Method for removing transverse corner cracks of extremely thick continuous casting billet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344960A (en) * | 2015-11-26 | 2016-02-24 | 首钢京唐钢铁联合有限责任公司 | Method for increasing casting speed of chamfering crystallizer |
| CN108213367A (en) * | 2016-12-15 | 2018-06-29 | 株式会社Posco | The uniform austenitic stainless steel continuous cast method of water distribution of secondary cooling platform |
| CN108393456A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of Q345B slabs continuous casting billet structure control method |
| CN107881289A (en) * | 2017-10-23 | 2018-04-06 | 苏州大学 | A kind of method for improving steel high-temp plastic |
| CN107983926A (en) * | 2017-12-29 | 2018-05-04 | 南京钢铁股份有限公司 | A kind of billet caster di-cold spray nozzle and its method for arranging |
| CN115090847A (en) * | 2022-05-31 | 2022-09-23 | 天津钢铁集团有限公司 | Spraying cooling control system and control method for corner of plate blank after being discharged from crystallizer |
| CN115090847B (en) * | 2022-05-31 | 2024-03-08 | 天津钢铁集团有限公司 | Spray cooling control system and control method for corner of slab after exiting crystallizer |
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Application publication date: 20150513 |
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