CN102527965A - Method for desulfurizing in continuous casting process and pouring box wire feeding device thereof - Google Patents
Method for desulfurizing in continuous casting process and pouring box wire feeding device thereof Download PDFInfo
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- CN102527965A CN102527965A CN2010105842309A CN201010584230A CN102527965A CN 102527965 A CN102527965 A CN 102527965A CN 2010105842309 A CN2010105842309 A CN 2010105842309A CN 201010584230 A CN201010584230 A CN 201010584230A CN 102527965 A CN102527965 A CN 102527965A
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Abstract
The invention relates to a method for desulfurizing in a continuous casting process and a pouring box wire feeding device thereof. The method is characterized in that: a core-spun yarn is fed into molten steel through a long water port opening of a pouring box in the continuous casting process. The method comprises the following operating steps of: (1) in a large tank casting process, feeding a silicon-calcium or iron-calcium core-spun yarn into molten steel through a pouring box wire feeding device arranged on a long water port of the pouring box; and (2) meanwhile, introducing inert gas into the pouring box wire feeding device. Compared with the prior art, the method has the beneficial effects that: (1) calcium is distributed more uniformly, a sulfide deteriorating effect is enhanced, and a columnar crystal and a segregation region is smaller; (2) the adding amount of metal calcium can be adjusted optionally; (3) the accurate alloy element hit rate is +/-10 ppm, the stable yield of an alloy element is increased greatly, and the yield of calcium is 30-45 percent, which is much higher than that in the conventional wire feeding process; and (4) operation is simple and practicable, and cost is low.
Description
Technical field
The present invention relates to a kind of continuous casting tundish metallurgy technical field, the method for desulfurization and tundish threads feeding apparatus thereof in particularly a kind of casting process.
Background technology
Generally speaking, except that indivedual steel grades such as automatic steel, sulphur is the harmful element in the steel; In steel, form sulphide inculsion, reduce the ductility and the toughness, particularly impact flexibility of steel; When sulphur exists with the form of iron sulfide, can cause hot-short, simultaneously; The steel resistance to corrosion that sulfur-bearing is high reduces significantly, and is also unfavorable to the welding performance of steel.Austenitic stainless steel the sulphide stress corrosion crackle can occur through spot corrosion; The gap that its spot corrosion source just produces between sulfide-based field trash and steel; Make it to become the responsive source that hydrogen is induced crackle; Therefore, improve the degree of purity of steel, it is most important with the minimizing defective to improving steel performance to reduce sulfur content.
The process that a lot of desulfurization are arranged at present, and can the sulphur of molten steel be reduced to very low-level, but owing to be prone to take place back the sulphur phenomenon in the sweetening process, after the refining treatment end, can cause composition " to act improperly " as if sulphur takes place back, influence the quality of product.
Summary of the invention
The method and the tundish threads feeding apparatus thereof that the purpose of this invention is to provide desulfurization in a kind of casting process adopt the desulfurization of tundish long nozzle line feeding technology, improve the qualification rate of low-sulfur steel composition.
For solving the problems of the technologies described above, technical scheme of the present invention is:
The method of desulfurization is characterized in that in a kind of casting process, and in casting process, the long nozzle through tundish feeds the core-spun yarn desulfurization in molten steel, and its operating procedure is following:
1) in big jar casting process, in molten steel, feeds silico-calcium or iron-calcium core-spun yarn through the tundish threads feeding apparatus that is located on the tundish long nozzle, core-spun yarn diameter 1～20mm, feeding wire speed 10～500m/min;
2) simultaneously, also feed inert gas in the tundish threads feeding apparatus, inert gas is argon Ar or nitrogen N
2, also can be argon Ar and nitrogen N
2Mist, gas flow 3～350L/min, 1.0～12 atmospheric pressure of air pressure.
Described tundish threads feeding apparatus comprises wire feeder, protective gas pipeline, also comprises joint, clip, gas guarantor threeway, and joint is arranged in the perforate of tundish molten steel top long nozzle, and clip is fixed on joint on the long nozzle, and joint is protected threeway with gas and is connected.Described opening diameter 1～50mm, 1～10 of quantity, opening axis is to axially being 10～80 ° of inclination angles with long nozzle.Described perforate is 35～700mm apart from the long nozzle upper edge, arranges along the long nozzle axis vertical, or along long nozzle radial distribution or shape distribution in the shape of a spiral, also can be the asymmetric distribution in space.
Said joint diameter 5～30mm, internal diameter 1～26mm.Said joint and bottom, perforate junction are provided with fire-resistant asbestos washer, and sidewall adopts fire-resistant high temperature adhesive.
Said gas is protected threeway and is comprised hello fiber tube road and protective gas pipeline, feeds 10～170 ° of fiber tube road and protective gas pipeline angles, and wherein feeding the fiber tube road is the straight line pipeline.Said fiber tube road diameter 3～35mm, the protective gas pipeline diameter 3～35mm of feeding.Said joint is protected threeway for being threaded with gas.
Compared with prior art, the invention has the beneficial effects as follows: 1) calcium is more evenly distributed, and is better to the sulfide modification effect, and column crystal and segregation zone are littler, and field trash is prone to come-up; 2) addition of calcium metal can arbitrarily be adjusted, thereby satisfies different demands; 3) can realize in the molten steel that alloying element accurately adds hit rate between ± 10ppm, greatly improve the stable recovery rate of alloying element, the recovery rate of calcium is higher than traditional line feeding technology far away between 30～45%; 4) operation is simple, and cost is low, can be fast, stably calcium metal is joined in the molten steel.
Description of drawings
Fig. 1 is a sulfur method sketch map in the casting process of the present invention;
Fig. 2 is that gas of the present invention is protected the three-port structure sketch map;
Fig. 3 is a long nozzle perforate sketch map;
Fig. 4 is the local enlarged diagram of long nozzle perforate top connection;
Fig. 5 is an A-A cutaway view among Fig. 4.
Among the figure: 1-ladle 2-long nozzle 3-tundish 4-wire feeder 5-protective gas pipeline 6-gas is protected threeway 7-and is fed fiber tube road 8-perforate 9-joint 10-clip 11-tundish threads feeding apparatus
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
See Fig. 1～Fig. 5; The method of desulfurization in a kind of casting process of the present invention; In casting process when molten steel flows into tundish 3 through long nozzle 2 in ladle 1, in molten steel, feed the core-spun yarn desulfurization through the tundish threads feeding apparatus 11 that is located on the tundish long nozzle 2, its operating procedure is following: 1) in molten steel, feed silico-calcium or iron-calcium core-spun yarn through tundish threads feeding apparatus 11; Core-spun yarn diameter 1～20mm, feeding wire speed 10～500m/min; 2) simultaneously, also feed inert gas in the tundish threads feeding apparatus 11, inert gas is argon Ar or nitrogen N
2, also can be argon Ar and nitrogen N
2Mist, gas flow 3～350L/min, 1.0～12 atmospheric pressure of air pressure.
Tundish threads feeding apparatus 11 comprises wire feeder 4, protective gas pipeline 5; Also comprise joint 9, clip 10, gas guarantor threeway 6; Joint 9 is arranged in the perforate 8 of tundish 3 molten steel top long nozzles 2, and clip 10 is fixed on joint 9 on the long nozzle 2, and joint 9 is protected threeway 6 with gas and is connected.Described perforate 8 diameters 1～50mm, 1～10 of quantity, perforate 8 axially and long nozzle 2 axially be 10～80 ° of inclination angles.Described perforate 8 is 35～700mm apart from long nozzle 2 upper edges, arranges along long nozzle 2 axis verticals, or along long nozzle radial distribution or shape distribution in the shape of a spiral, also can be the asymmetric distribution in space.
Said joint 9 diameters 5～30mm, internal diameter 1～26mm.Said joint 9 is provided with fire-resistant asbestos washer with bottom, perforate 8 junctions, and sidewall adopts fire-resistant high temperature adhesive.
Said gas is protected threeway 6 and is comprised hello fiber tube road 7 and protective gas pipeline 5, feeds fiber tube road 7 and 10～170 ° of protective gas pipeline 5 angles, and wherein feeding fiber tube road 7 is the straight line pipeline.Said fiber tube road 7 diameters, 3～35mm, the protective gas pipeline 5 diameters 3～35mm of feeding.Said joint 9 is protected threeway 6 for being threaded with gas.
Selection is the experiment steel grade with silicon steel, uses two stream slab casters, and the section of strand is 1150 * 230mm, and pulling rate is 1.2m/min.Select tundish threads feeding apparatus parameter: the long nozzle perforate 8 position distance mouth of a river 2 top 100mm, perforate 8 quantity are one, and the diameter of perforate is at 10mm, and the axial and long nozzle 2 of perforate 8 axially is 10 ° of angles, and the diameter of joint 9 is 20mm, internal diameter is 10mm.Employing is connected joint 9 and gas guarantor threeway 6 to silk, and it is 8mm that gas is protected threeway 6 straight lines hello fiber tube road 7 internal diameters, and protective gas pipeline 5 internal diameters are 5mm, protective gas pipeline 5 and 70 ° of hello fiber tube road 7 angles.
The line feeding desulfurization operations: protect threeway 6 through gas and be blown into argon gas, supply gas pressure is 2 atmospheric pressure, and flow is 50L/min.CaO+CaF
2The diameter of core-spun yarn is 5mm, and containing CaO in the core-spun yarn is 80%, CaF
2Be 20%, pulvis content is at 30～40g, and feeding wire speed is 50m/min, and the line feeding amount is 500m.Before the last machine in the molten steel sulphur S content be 60ppm, after the line feeding in the strand sulphur S content be 30ppm.
Select the X70 pipe line steel to be the experiment steel grade, use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.0m/min.Select tundish threads feeding apparatus parameter: the long nozzle perforate 8 position distance mouth of a river 2 top 150mm, perforate 8 quantity are two, and the diameter of perforate 8 is at 15mm, and the axial and long nozzle 2 of perforate 8 axially is 20 ° of angles, and the diameter of joint 9 is 15mm, internal diameter is 10mm.Employing is connected joint 9 and gas guarantor threeway 6 to silk, and it is 10mm that gas is protected threeway 6 straight line portioies hello fiber tube road 7 internal diameters, and protective gas pipeline 5 internal diameters are 8mm, and protective gas pipeline 5 is 90 ° with feeding fiber tube road 7 part angles.
The line feeding desulfurization operations: protect threeway 6 through gas and be blown into argon gas, supply gas pressure is 5 atmospheric pressure, and flow is 30L/min.CaO+CaF
2The diameter of core-spun yarn is 8mm, and containing CaO in the core-spun yarn is 70%, CaF
2Be 30%, pulvis content adopts two wire feeder 4 line feedings at 80～100g, and feeding wire speed is 50m/min, and every line feeding amount is 250m.Before the last machine in the molten steel sulphur S content be 45ppm, after the line feeding in the strand sulphur S content be 20ppm.
Select the X80 pipe line steel to be the experiment steel grade, use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.0m/min.Select tundish threads feeding apparatus parameter: the long nozzle perforate 8 position distance mouth of a river 2 top 150mm, perforate 8 quantity are 5, and the diameter of perforate 8 is at 15mm, and the axial and long nozzle 2 of perforate 8 axially is 20 ° of angles, and the diameter of joint 9 is 15mm, internal diameter is 10mm.Employing is connected joint 9 and gas guarantor threeway 6 to silk, and it is 10mm that gas is protected threeway 6 straight line portioies hello fiber tube road 7 internal diameters, and protective gas pipeline 5 internal diameters are 8mm, protective gas pipeline 5 and 120 ° of hello fiber tube road 7 angles.
The line feeding desulfurization operations: protect threeway 6 through gas and be blown into argon gas, supply gas pressure is 7 atmospheric pressure, and flow is 80L/min.CaO+CaF
2The diameter of core-spun yarn is 8mm, and containing CaO in the core-spun yarn is 70%, CaF
2Be 30%, pulvis content adopts five wire feeder 4 line feedings at 80～100g, and feeding wire speed is 50m/min, and single channel line feeding amount is 300m.Before the last machine in the molten steel sulphur S content be 35ppm, after the line feeding in the strand sulphur S content be 10ppm.
Claims (9)
1. the method for desulfurization in the casting process is characterized in that, in casting process, the long nozzle through tundish feeds the core-spun yarn desulfurization in molten steel, and its operating procedure is following:
1) in big jar casting process, in molten steel, feeds silico-calcium or iron-calcium core-spun yarn through the tundish threads feeding apparatus that is located on the tundish long nozzle, core-spun yarn diameter 1～20mm, feeding wire speed 10～500m/min;
2) simultaneously, also feed inert gas in the tundish threads feeding apparatus, inert gas is argon Ar or nitrogen N
2, also can be argon Ar and nitrogen N
2Mist, gas flow 3～350L/min, 1.0～12 atmospheric pressure of air pressure.
2. the described tundish threads feeding apparatus of claim 1; Comprise wire feeder, protective gas pipeline; It is characterized in that also comprise joint, clip, gas guarantor threeway, joint is arranged in the perforate of tundish molten steel top long nozzle; Clip is fixed on joint on the long nozzle, and joint is protected threeway with gas and is connected.
3. tundish threads feeding apparatus according to claim 2 is characterized in that, described opening diameter 1～50mm, and 1～10 of quantity, opening axis is to axially being 10～80 ° of inclination angles with long nozzle.
4. according to claim 2 or 3 described tundish threads feeding apparatus; It is characterized in that described perforate is 35～700mm apart from the long nozzle upper edge, arrange along the long nozzle axis vertical; Or, also can be the asymmetric distribution in space along long nozzle radial distribution or shape distribution in the shape of a spiral.
5. tundish threads feeding apparatus according to claim 2 is characterized in that, said joint diameter 5～30mm, internal diameter 1～26mm.
6. according to claim 2 or 5 described tundish threads feeding apparatus, it is characterized in that said joint and bottom, perforate junction are provided with fire-resistant asbestos washer, sidewall adopts fire-resistant high temperature adhesive.
7. tundish threads feeding apparatus according to claim 2 is characterized in that, said gas is protected threeway and comprised hello fiber tube road and protective gas pipeline, feeds 10～170 ° of fiber tube road and protective gas pipeline angles, and wherein feeding the fiber tube road is the straight line pipeline.
8. tundish threads feeding apparatus according to claim 7 is characterized in that, said fiber tube road diameter 3～35mm, the protective gas pipeline diameter 3～35mm of feeding.
9. tundish threads feeding apparatus according to claim 6 is characterized in that, said joint is protected threeway for being threaded with gas.
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| CN2010105842309A CN102527965A (en) | 2010-12-11 | 2010-12-11 | Method for desulfurizing in continuous casting process and pouring box wire feeding device thereof |
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| CN2010105842309A CN102527965A (en) | 2010-12-11 | 2010-12-11 | Method for desulfurizing in continuous casting process and pouring box wire feeding device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527962A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Adding device and adding method for metal calcium in continuous casting process |
| CN102554159A (en) * | 2010-12-15 | 2012-07-11 | 鞍钢股份有限公司 | Device and method for feeding rare earth alloy during continuous casting process |
| CN108176844A (en) * | 2018-01-15 | 2018-06-19 | 山东钢铁股份有限公司 | A kind of device and method for clearing up tundish upper nozzle dross object |
| CN111893400A (en) * | 2020-08-18 | 2020-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for welded pipe with yield strength of 300MPa |
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| GB1271022A (en) * | 1965-11-15 | 1972-04-19 | Est Aciers Fins | Improved process for the continuous casting of steel |
| US3766961A (en) * | 1969-09-04 | 1973-10-23 | Roblin Industries | Apparatus for continuously casting steel |
| US5419952A (en) * | 1992-05-11 | 1995-05-30 | Burlington Industries, Inc. | Making slub yarn on open-end machine, and composite fabric |
| CN1363439A (en) * | 2001-07-20 | 2002-08-14 | 南京理工大学 | Conticasting technology for feeding rare-earth wires into tundish |
| CN1548257A (en) * | 2003-05-09 | 2004-11-24 | 宝钢集团上海第一钢铁有限公司 | Method and apparatus of adding alloy into liquid metal |
| CN101348847A (en) * | 2008-07-23 | 2009-01-21 | 鞍钢股份有限公司 | Technological process for secondary refining desulphurization |
| CN101824511A (en) * | 2010-02-05 | 2010-09-08 | 鞍钢股份有限公司 | RH injection refining device and application thereof |
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Patent Citations (7)
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| GB1271022A (en) * | 1965-11-15 | 1972-04-19 | Est Aciers Fins | Improved process for the continuous casting of steel |
| US3766961A (en) * | 1969-09-04 | 1973-10-23 | Roblin Industries | Apparatus for continuously casting steel |
| US5419952A (en) * | 1992-05-11 | 1995-05-30 | Burlington Industries, Inc. | Making slub yarn on open-end machine, and composite fabric |
| CN1363439A (en) * | 2001-07-20 | 2002-08-14 | 南京理工大学 | Conticasting technology for feeding rare-earth wires into tundish |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527962A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Adding device and adding method for metal calcium in continuous casting process |
| CN102554159A (en) * | 2010-12-15 | 2012-07-11 | 鞍钢股份有限公司 | Device and method for feeding rare earth alloy during continuous casting process |
| CN108176844A (en) * | 2018-01-15 | 2018-06-19 | 山东钢铁股份有限公司 | A kind of device and method for clearing up tundish upper nozzle dross object |
| CN108176844B (en) * | 2018-01-15 | 2019-07-05 | 山东钢铁股份有限公司 | A kind of device and method for clearing up tundish upper nozzle dross object |
| CN111893400A (en) * | 2020-08-18 | 2020-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for welded pipe with yield strength of 300MPa |
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Application publication date: 20120704 |