CN105033209A - Method for improving quality of high-carbon steel in continuous casting process - Google Patents
Method for improving quality of high-carbon steel in continuous casting process Download PDFInfo
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- CN105033209A CN105033209A CN201510489292.4A CN201510489292A CN105033209A CN 105033209 A CN105033209 A CN 105033209A CN 201510489292 A CN201510489292 A CN 201510489292A CN 105033209 A CN105033209 A CN 105033209A
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Abstract
The invention belongs to the technical field of improving the internal quality of high-carbon steel, and particularly relates to a method for improving the internal quality of high-carbon steel in the continuous casting process. The method comprises the following steps that 1, the parameter of an electromagnetic stirring crystallizer is set; 2, the coil parameter of the electromagnetic stirring crystallizer is set; 3, the water volume parameter of the crystallizer is set; 4, tundish black slag operation is carried out; 5, the temperature of tundish molten steel is controlled; and 6, a pouring mode is selected. The method has the beneficial effects that the set electromagnetic stirring parameter, a pull speed system, a cooling system and a temperature system are combined, and the internal quality of the high-carbon steel is improved.
Description
Technical field
The invention belongs to the technical field improving Internal Quality of High Carbon Steel, be specifically related to a kind of method that continuous casting link improves high-carbon steel quality.
Background technology
High-carbon steel, mainly for the production of all kinds of high-strength wire material and high-end steel strand wires, steel cord etc., requires higher to slab quality.For high-carbon steel, itself intrinsic some physical parameter (as solid-state thermal conductivity factor etc.) makes its centre easily occur loosening, the defect such as shrinkage cavity and center segregation, so in actual production process, rational technology and effective Controlling Technology parameter should be adopted to alleviate these defects.The gross imperfection such as center segregation and center porosity can be avoided by increasing equiaxial crystal ratio on casting blank section or improve.Large quantity research shows, substantially could eliminate center segregation when equiaxial crystal ratio on casting blank section reaches more than 35% ~ 40%.Obtain equiax crystal in production, improving the conventional method of internal soundness has electromagnetic agitating technology, Prepared by Low Superheat Pouring, the cast of constant pulling rate, the cast of low pulling rate, strand weak cold etc.
The steel grade of high carbon content has the tendency making casting blank solidification tissue deterioration, and between its liquid phase and solid phase, temperature range is comparatively large, and solidifying gap length increases, and atherosclerotic district is widened.And two of strand casted from high carbon steel major defects and center segregation and center porosity are in the formation and development of atherosclerotic district, the higher center segregation of phosphorus content is also more serious.And the main path controlling gross segregation is: promote that column crystal is to the conversion of equiax crystal, produces wide and thin equiax crystal district, makes it dense pack solidification end, increase the length in atherosclerotic district, and keep the uniformity of its mobility and temperature and composition as far as possible; Achieve the above object, adopt electromagnetic agitating technology to be the most effective.But the metallurgical effect only using electromagnetic agitation cannot reach best, needs rational technique and matches.
Summary of the invention
Object of the present invention is exactly to provide a kind of stirring parameter of setting, pulling rate system, cooling system, temperature schedule of adopting to combine, and improves the method for Internal Quality of High Carbon Steel.
The present invention is achieved through the following technical solutions:
Continuous casting link improves a method for high-carbon steel quality, it is characterized in that: the method installs following step:
(1) electromagnetic stirring mould optimum configurations: stir current is 250A, stirring frequency is 3HZ;
(2) electromagnetic stirring mould coil parameter is arranged: resistance to earth >=2000W, center magnetic induction intensity amplitude Bom >=800Gs, electromagnetic force moment of torsion >=6Kgf.cm;
(3) crystallizer water amount parameters is arranged: crystallizer cooling and cooling twice all adopt weak cold, and crystallizer water rate control is at (130-135) t/h, and two cold specific waters control at 0.9L/Kg;
(4) the black slag operation of bag in: every stove steel adds carbon-free dose of 40-60kg, and middle bag adopts sealed clad, middle handbag lid surrounding uses asbestic blanket sealing;
(5) in, Baogang's coolant-temperature gage controls: middle bag molten steel overheat is 20 DEG C, and for SWRCH82B liquidus temperature 1470 DEG C, tundish temperature is 1475 DEG C-1490 DEG C;
(6) pouring type: cast pulling rate speed is 1.8m/min, adopts constant pulling rate to pour into a mould.
The method uses in the process of R8m full arc shape four machine four strand casting machine casting 150mm × 150mm square billet high-carbon steel.
Compared with prior art, beneficial effect of the present invention is:
1) select best stirring parameter, electromagnetic agitation electric current 250A, electromagnetic agitation frequency 3HZ, ensure to obtain optimum stirring intensity, avoid stirring intensity too little, strand liquid core can not stir, can not stability contorting Columnar to equiaxed transition; Stirring intensity is too large, and cause liquid fluctuating and slag, strand is subcutaneous also there will be negative segregation, and increases the load of equipment.
2) the advanced checkout equipments such as gaussmeter, moment instrument, Insulation Resistance Tester are adopted, monitoring electromagnetic agitation function, ensure electromagnetic stirring mould center magnetic induction intensity amplitude Bom >=800Gs, electromagnetic force moment of torsion >=6Kgf.cm, insulated coil resistance to earth >=2000W.
3) crystallizer, cooling twice adopt weak cold, and crystallizer water rate control is at (130-135) t/h, and two cold specific waters control at 0.9L/Kg, ensure cooling uniformity, suppress column crystals growth, expand Center Equiaxial Crystal district.
4) rationally tundish temperature is determined, every stove steel adds carbon-free dose of (40 ~ 60) Kg alkalescence, middle handbag lid surrounding uses the measures such as asbestic blanket sealing, the temperature loss of minimizing process, ensures that the degree of superheat controls to pour into a mould within 20 DEG C, reduces center segregation, center porosity Level.
5) adopt constant pulling rate to pour into a mould, make pulling rate as far as possible not variation with temperature and frequent fluctuation.The frequent fluctuation of liquid steel level can be avoided to greatest extent, reduce slag ratio and the impact of water yield fluctuation on slab quality.
6) adopt low pulling rate to pour into a mould, casting speed control, at 1.8m/min, increases the time of staying of molten steel in crystallizer, accelerates removing of superheat of liquid steel, suppresses column crystals growth, promotes equiax crystal development.
Detailed description of the invention
Below the present invention is described further:
Continuous casting link improves a method for high-carbon steel quality, it is characterized in that: the method installs following step:
(1) electromagnetic stirring mould optimum configurations: stir current is 250A, stirring frequency is 3HZ;
(2) electromagnetic stirring mould coil parameter is arranged: resistance to earth >=2000W, center magnetic induction intensity amplitude Bom >=800Gs, electromagnetic force moment of torsion >=6Kgf.cm;
(3) crystallizer water amount parameters is arranged: crystallizer cooling and cooling twice all adopt weak cold, and crystallizer water rate control is at (130-135) t/h, and two cold specific waters control at 0.9L/Kg;
(4) the black slag operation of bag in: every stove steel adds carbon-free dose of 40-60kg, and middle bag adopts sealed clad, middle handbag lid surrounding uses asbestic blanket sealing;
(5) in, Baogang's coolant-temperature gage controls: middle bag molten steel overheat is 20 DEG C, and for SWRCH82B liquidus temperature 1470 DEG C, tundish temperature is 1475 DEG C-1490 DEG C;
(6) pouring type: cast pulling rate speed is 1.8m/min, adopts constant pulling rate to pour into a mould.
Embodiment 1
Produce the method for high-carbon steel according to R8m full arc shape four machine four strand casting machine of the present invention, following parameter is arranged.
Secondary cooling water adopts high-carbon steel automatic distribution water pattern, and specific water controls at 0.9L/kg.
。
Claims (2)
1. continuous casting link improves a method for high-carbon steel quality, it is characterized in that: the method installs following step:
(1) electromagnetic stirring mould optimum configurations: stir current is 250A, stirring frequency is 3HZ;
(2) electromagnetic stirring mould coil parameter is arranged: resistance to earth >=2000W, center magnetic induction intensity amplitude Bom >=800Gs, electromagnetic force moment of torsion >=6Kgf.cm;
(3) crystallizer water amount parameters is arranged: crystallizer cooling and cooling twice all adopt weak cold, and crystallizer water rate control is at (130-135) t/h, and two cold specific waters control at 0.9L/Kg;
(4) the black slag operation of bag in: every stove steel adds carbon-free dose of 40-60kg, and middle bag adopts sealed clad, middle handbag lid surrounding uses asbestic blanket sealing;
(5) in, Baogang's coolant-temperature gage controls: middle bag molten steel overheat is 20 DEG C, and for SWRCH82B liquidus temperature 1470 DEG C, tundish temperature is 1475 DEG C-1490 DEG C;
(6) pouring type: cast pulling rate speed is 1.8m/min, adopts constant pulling rate to pour into a mould.
2. a kind of continuous casting link as claimed in claim 1 improves the method for high-carbon steel quality, it is characterized in that: the method uses in the process of R8m full arc shape four machine four strand casting machine casting 150mm × 150mm square billet high-carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510489292.4A CN105033209A (en) | 2015-08-11 | 2015-08-11 | Method for improving quality of high-carbon steel in continuous casting process |
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| CN201510489292.4A CN105033209A (en) | 2015-08-11 | 2015-08-11 | Method for improving quality of high-carbon steel in continuous casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112872307A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN115383063A (en) * | 2022-08-25 | 2022-11-25 | 湖南华菱涟源钢铁有限公司 | Production method of SK120 ultrahigh-carbon steel plate |
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| JPH11226705A (en) * | 1998-02-20 | 1999-08-24 | Nippon Steel Corp | Device for controlling fluidity of molten metal |
| JP2003236644A (en) * | 2002-02-19 | 2003-08-26 | Kobe Steel Ltd | Method for continuously casting steel |
| CN101648212A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B |
| CN103028713A (en) * | 2012-08-14 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Continuous casting method for controlling 82B billet carbon segregation |
| CN103506586A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet |
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2015
- 2015-08-11 CN CN201510489292.4A patent/CN105033209A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11226705A (en) * | 1998-02-20 | 1999-08-24 | Nippon Steel Corp | Device for controlling fluidity of molten metal |
| JP2003236644A (en) * | 2002-02-19 | 2003-08-26 | Kobe Steel Ltd | Method for continuously casting steel |
| CN101648212A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B |
| CN103506586A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet |
| CN103028713A (en) * | 2012-08-14 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Continuous casting method for controlling 82B billet carbon segregation |
Non-Patent Citations (1)
| Title |
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| 李家征等: "末端电磁搅拌技术对82B钢中心碳偏析的影响", 《河北冶金》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112872307A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN112872307B (en) * | 2021-02-26 | 2022-07-26 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN115383063A (en) * | 2022-08-25 | 2022-11-25 | 湖南华菱涟源钢铁有限公司 | Production method of SK120 ultrahigh-carbon steel plate |
| CN115383063B (en) * | 2022-08-25 | 2024-01-26 | 湖南华菱涟源钢铁有限公司 | Production method of SK120 ultra-high carbon steel plate |
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Application publication date: 20151111 |