CN102344993A - Method for changing property of foreign substance in molten steel - Google Patents
Method for changing property of foreign substance in molten steel Download PDFInfo
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- CN102344993A CN102344993A CN2011101904866A CN201110190486A CN102344993A CN 102344993 A CN102344993 A CN 102344993A CN 2011101904866 A CN2011101904866 A CN 2011101904866A CN 201110190486 A CN201110190486 A CN 201110190486A CN 102344993 A CN102344993 A CN 102344993A
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Abstract
The invention discloses a method for changing the properties of foreign substances in molten steel. According to the invention, during the converter tapping process, molten steel is pretreated, such that the dosage of aluminum wires into the molten steel at an argon station is reduced, the property of foreign substances in molten steel is changed, and the purpose of improving the purity of molten steel is achieved. The method comprises steps of: 1, a tapping process composite deoxidizer dosage controlling step; 2, an argon station aluminum wire dosage controlling step; and 3, an argon station argon blowing intensity and time controlling step. Compared to prior arts, with the technical schemes provided by the invention, oxygen content in molten steel can be better reduced, the property of nonmetal foreign substances in molten steel can be changed, the dosage of the deoxidizer is increased, the dosage of aluminum wire at the argon station is reduced, the production cost is reduced, and continuous castability of molten steel is improved.
Description
Technical field
The present invention relates to the smelting of steel, be specifically related to a kind of method that changes molten steel inclusion character.
Background technology
The converter smelting technology is that molten iron is finally removed the purpose that is harmful to inclusion in the molten iron through oxygen supply with stirring.But for some simple comparatively common steel grades, the unnecessary refining procedure that passes through again after converter smelting finishes directly just can transfer to continuous casting and pour into a mould.In general, common steel grade is not done requirement to Als, and molten steel adopts composite deoxidant and alloy to carry out preliminary dexidation in tapping process, and add aluminum steel at the argon station again and carry out the Als fine setting, thereby even reach deoxidation of molten steel purpose completely; But the aluminum steel add-on is excessive, can cause watering property of molten steel variation.Mainly be through to the molten iron oxygen supply in the convertor steelmaking process; The simultaneous intensive stirs; Objectionable impurities in the molten iron is effectively removed, but molten steel reach that objectionable impurities is not whole removals behind the smelting endpoint, in molten steel, all exists certain equilibrium relationship.The main standard of confirming the molten steel blow end point is the height of C content in the molten steel, and the concentration of the carbon oxygen in the molten steel long-pending be a constant, therefore, the carbon oxygen content of molten steel terminal point is inversely proportional to.The oxygen that how to remove in the molten steel is one of main task in the converter tapping process, and technology is exactly in tapping process, to use alloy reductor and manganeseirom to carry out deoxidation at present, and the oxygen level in the molten steel reduces the most at last; Use alloy reductor and manganeseirom to carry out deoxidation, alloy reductor add-on is big, and the ferromanganese yield reduces, and causes production cost high.
Summary of the invention
To the problems referred to above; The purpose of this invention is to provide a kind of method that changes molten steel inclusion character; In the converter tapping process,, change molten steel inclusion character, finally reach the purpose that improves the molten steel purity thereby reduce the aluminum steel add-on of molten steel at the argon station through molten steel is carried out pre-treatment.
For this reason, the technical scheme taked of the present invention is that this method may further comprise the steps:
1, tapping process composite deoxidant add-on controlled step: converter tapping C content＞0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 1.6～2.0Kg/t steel; Converter tapping 0.04%≤C content＜0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.0～2.4Kg/t steel; Converter tapping C content＜0.04% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.4～2.8Kg/t steel;
2, argon station aluminum steel add-on controlled step: the argon station is not required the steel grade that adds Ti, and aluminum steel adds requirement and when ladle refining slag adds, adds; Need add the steel grade of Ti to the argon station, the aluminum steel adding requires after ferrotianium adds back Argon 3min, to add opportunity again; Above-mentioned aluminum steel add-on is all controlled according to 1.1～1.3m/t steel;
3, argon station Argon intensity and time controlled step: aluminum steel adds the back and transfers big argon gas amount to guarantee strong argon blowing time >=5min; Treat that turning the argon gas amount down behind the strong Argon 5min carries out the soft blow argon, the soft blow argon time must be guaranteed >=6min, gone up the steel temperature requirement to satisfy;
In order to guarantee the molten steel quantity of slag≤20mm behind the argon station, tapping takes floating plug to carry out pushing off the slag early stage, and the later stage takes slag stop cone to carry out pushing off the slag, and the pushing off the slag success ratio is more than 95%.Adopt composite deoxidant to carry out deoxidation in the tapping process, molten steel adopts aluminum steel to carry out final deoxidation behind the argon station and alloying changes molten steel inclusion character, finally reaches the purpose of raising molten steel purity.
Because the present invention has taked technique scheme; Compared with prior art, the present invention can better reduce oxygen level in the molten steel, changes the character of non-metallic inclusion in the molten steel; Increased the usage quantity of reductor; Reduce the add-on of argon station aluminum steel, reduced production cost, improved the watering property continuously of molten steel.
Embodiment
The method of change molten steel inclusion character according to the invention may further comprise the steps:
1, tapping process composite deoxidant add-on controlled step: converter tapping C content＞0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 1.6～2.0Kg/t steel; Converter tapping 0.04%≤C content＜0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.0～2.4Kg/t steel; Converter tapping C content＜0.04% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.4～2.8Kg/t steel;
2, argon station aluminum steel add-on controlled step: the argon station is not required the steel grade that adds Ti, and aluminum steel adds requirement and when ladle refining slag adds, adds; Need add the steel grade of Ti to the argon station, the aluminum steel adding requires after ferrotianium adds back Argon 3min, to add opportunity again; Above-mentioned aluminum steel add-on is all controlled according to 1.1～1.3m/t steel;
3, argon station Argon intensity and time controlled step: aluminum steel adds the back and transfers big argon gas amount to guarantee strong argon blowing time >=5min; Treat that turning the argon gas amount down behind the strong Argon 5min carries out the soft blow argon, the soft blow argon time must be guaranteed >=6min, gone up the steel temperature requirement to satisfy;
In order to guarantee the molten steel quantity of slag≤20mm behind the argon station, tapping takes floating plug to carry out pushing off the slag early stage, and the later stage takes slag stop cone to carry out pushing off the slag, and the pushing off the slag success ratio is more than 95%.Adopt composite deoxidant to carry out deoxidation in the tapping process, molten steel adopts aluminum steel to carry out final deoxidation behind the argon station and alloying changes molten steel inclusion character, finally reaches the purpose of raising molten steel purity.
The present invention is only limited to converter smelting and finishes all steel grades that the straight upward continuous casting in back is poured into a mould, and the technology point in the implementation process is following:
1, tapping process composite deoxidant add-on control requirement
1) converter tapping C content＞0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to the 1.8Kg/t steel;
2) converter tapping 0.04%≤C content＜0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to the 2.2Kg/t steel;
3) converter tapping C content＜0.04% o'clock, composite deoxidant sial calcium add-on is controlled according to the 2.7Kg/t steel;
2, argon station aluminum steel add-on control requirement
The argon station is not required the steel grade that adds Ti, and aluminum steel adds requirement and when ladle refining slag adds, adds; Need add the steel grade of Ti to the argon station, the aluminum steel adding requires after ferrotianium adds back Argon 3min, to add opportunity again; Concrete aluminum steel add-on unification is controlled according to the 1.3m/t steel;
3, argon station Argon intensity and time requirement
1) aluminum steel adds the back and transfers big argon gas amount to guarantee strong argon blowing time >=5min (strong Argon standard is controlled at 400-600mm and is as the criterion to blow molten steel bore hole diameter summation open); Treat to turn down behind the strong Argon 5min argon gas amount and carry out soft blow argon (soft blow argon standard is controlled at 200-400mm and is as the criterion to blow molten steel bore hole diameter summation open), the soft blow argon time must be guaranteed >=6min, gone up the steel temperature requirement to satisfy;
2) for need carry out alloy fine setting at the argon station or add the steel scrap cooling time; After must guaranteeing that alloy or steel scrap add; Strong argon blowing time >=5min (strong Argon standard is controlled at 400-600mm and is as the criterion to blow molten steel bore hole diameter summation open), soft blow argon time >=6min (soft blow argon standard is controlled at 200-400mm and is as the criterion to blow molten steel bore hole diameter summation open);
4, in process of the test, the process of the test data are gathered, mainly be Als content behind aluminum steel add-on and the argon at reductor add-on, argon station in the converter tapping process.Concrete statistic data such as following table:
From last table, can obtain; When smelting carbon structural steel; Stand erectly from argon and to go up continuous casting and pour into a mould, adopt this method can guarantee that not only the oxygen in the molten steel is effectively removed, also can play good deoxidation alloying effect through a spot of aluminum steel add-on simultaneously.
5, molten steel is in casting process, and watering property is strong, and submerged nozzle lower end dross is slight, can meet the needs of production.
The result shows that this invention can be satisfied the requirement that the converter smelting carbon structural steel is directly gone up continuous casting technology.
The present invention mainly is applicable to the production of carbon structural steel and common low-alloy Series Steel, and because of these steel grade ranks are lower, the simple and a wider range of composition is easy to control.So after the steel-making link can be taked by converter smelting, directly winching to continuous casting pours into a mould.
Claims (1)
1. method that changes molten steel inclusion character, this method may further comprise the steps:
1., tapping process composite deoxidant add-on controlled step: converter tapping C content＞0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 1.6～2.0Kg/t steel; Converter tapping 0.04%≤C content＜0.06% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.0～2.4Kg/t steel; Converter tapping C content＜0.04% o'clock, composite deoxidant sial calcium add-on is controlled according to 2.4～2.8Kg/t steel;
2., argon station aluminum steel add-on controlled step: the argon station is not required the steel grade that adds Ti, and aluminum steel adds requirement and when ladle refining slag adds, adds; Need add the steel grade of Ti to the argon station, the aluminum steel adding requires after ferrotianium adds back Argon 3min, to add opportunity again; Above-mentioned aluminum steel add-on is all controlled according to 1.1～1.3m/t steel;
3., argon station Argon intensity and time controlled step: aluminum steel adds the back and transfers big argon gas amount to guarantee strong argon blowing time >=5min; Treat that turning the argon gas amount down behind the strong Argon 5min carries out the soft blow argon, the soft blow argon time must be guaranteed >=6min, gone up the steel temperature requirement to satisfy.
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| CN2011101904866A CN102344993A (en) | 2011-07-08 | 2011-07-08 | Method for changing property of foreign substance in molten steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468432A (en) * | 2018-12-18 | 2019-03-15 | 南京钢铁股份有限公司 | A kind of method of deoxidation being suitable for carbon aluminium-killed steel |
| CN111440919A (en) * | 2020-06-01 | 2020-07-24 | 广东韶钢松山股份有限公司 | Argon station scrap steel adding system and scrap steel adding method |
| CN114369697A (en) * | 2022-02-08 | 2022-04-19 | 山东钢铁集团永锋临港有限公司 | Method for reducing smelting cost of converter |
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| CN1864879A (en) * | 2006-06-06 | 2006-11-22 | 湖南华菱涟源钢铁有限公司 | Method for producing semi-process cold-rolled silicon steel by sheet billet continuous casting and rolling process |
| CN101186994A (en) * | 2007-10-15 | 2008-05-28 | 莱芜钢铁集团有限公司 | Micro-alloying steel for oil gas transport seamless pipeline and its preparation method |
| CN101503746A (en) * | 2009-03-19 | 2009-08-12 | 新余钢铁股份有限公司 | Method for producing boron steel by converter |
| CN102021276A (en) * | 2010-11-25 | 2011-04-20 | 攀钢集团钢铁钒钛股份有限公司 | Method for controlling aluminum component in steel |
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- 2011-07-08 CN CN2011101904866A patent/CN102344993A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1864879A (en) * | 2006-06-06 | 2006-11-22 | 湖南华菱涟源钢铁有限公司 | Method for producing semi-process cold-rolled silicon steel by sheet billet continuous casting and rolling process |
| CN101186994A (en) * | 2007-10-15 | 2008-05-28 | 莱芜钢铁集团有限公司 | Micro-alloying steel for oil gas transport seamless pipeline and its preparation method |
| CN101503746A (en) * | 2009-03-19 | 2009-08-12 | 新余钢铁股份有限公司 | Method for producing boron steel by converter |
| CN102021276A (en) * | 2010-11-25 | 2011-04-20 | 攀钢集团钢铁钒钛股份有限公司 | Method for controlling aluminum component in steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468432A (en) * | 2018-12-18 | 2019-03-15 | 南京钢铁股份有限公司 | A kind of method of deoxidation being suitable for carbon aluminium-killed steel |
| CN111440919A (en) * | 2020-06-01 | 2020-07-24 | 广东韶钢松山股份有限公司 | Argon station scrap steel adding system and scrap steel adding method |
| CN114369697A (en) * | 2022-02-08 | 2022-04-19 | 山东钢铁集团永锋临港有限公司 | Method for reducing smelting cost of converter |
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Application publication date: 20120208 |