CN101934357B - Process for effectively controlling central segregation of continuous cast slab - Google Patents
Process for effectively controlling central segregation of continuous cast slab Download PDFInfo
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- CN101934357B CN101934357B CN2010102601442A CN201010260144A CN101934357B CN 101934357 B CN101934357 B CN 101934357B CN 2010102601442 A CN2010102601442 A CN 2010102601442A CN 201010260144 A CN201010260144 A CN 201010260144A CN 101934357 B CN101934357 B CN 101934357B
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Abstract
The invention relates to a process for effectively controlling center segregation of a continuous cast slab, in particular to a method for controlling the center segregation of the continuous cast slab with the thickness of more than 300mm. In the method, the center segregation is effectively controlled by combining stronger secondary cooling water quantity at the solidification tail end of the continuous cast slab with hydraulic cylinder pressure control on a soft reduction section. The pressure value of the hydraulic cylinder on the soft reduction section is controlled to be between 1,200 and 1,500KN, the inner arc side water quantity of the continuous cast slab on the soft reduction section is controlled to be between 6 and 12m<3>/h, and the outer arc water quantity of the continuous cast slab on the soft reduction section is controlled to be between 9 to 15m<3>/h. The cooling intensity on the surface of the continuous cast slab on the soft reduction section is increased, the shrinkage of the surface and the core of the continuous cast slab is consistent, the center segregation is controlled to a certain extent, the single dependency of center segregation control of the continuous cast slab on the hydraulic cylinder pressure on the soft reduction section is reduced, the service life of the soft reduction equipment is prolonged, and the process is simple, convenient and feasible.
Description
Technical field
The present invention relates to a kind of method of controlling the continuous casting steel billet center segregation, particularly effectively control the control method of thickness greater than the continuous casting steel billet center segregation of 300mm.
Background technology
Along with people's to the steel products quality require increasingly high; Continuous casting steel billet center segregation defective more and more becomes the principal element that influences steel product quality, for example when the continuous casting steel billet center segregation is serious, can cause one of the reduction of steel plate inspection qualification rate and principal element of yield of steel plate.Simultaneously the continuous casting billet center segregation be to processing and the service life of steel all producing adverse influence, for example for the pipe line steel of transport gas, and the H that pumped (conveying) medium is central
2Etching reaction can take place and produce hydrogen atom in S at tube wall surface, and hydrogen atom spreads in tube wall, and segregation recombines into H with loose place in tube wall
2Molecule causes very big local pressure, reaches as high as 3000 atmospheric pressure, so form hydrogen induced cracking even cause pipeline breaking.For the structural steel that drilling at the sea, platform are used, segregation reduces its welding performance, makes material be difficult for welding even cracking, causes reduce greatly the service life of steel.For this reason, the measure and the technology of the segregation of a series of control centres have obtained development and application, comprise electromagnetic agitating technology and gently depress technology etc.Electromagnetic agitating technology has obtained using widely on billet caster, then more is being to have adopted the technology of gently depressing on slab caster.Yet along with the continuous increase of continuous casting steel billet thickness, the control difficulty of center segregation constantly increases, control continuous casting billet center segregation to light reduction section hydraulic test require increasingly high.
Summary of the invention
Particularly thickness is greater than the control method of the continuous casting steel billet center segregation of 300mm to the object of the present invention is to provide a kind of continuous casting steel billet, and its principle is to combine the common effective control that realizes the continuous casting billet center segregation of light reduction section cylinder pressure control through the stronger secondary cooling water amount of continuous casting billet solidification end.
The present invention realizes through following technical proposal: the present invention provides a kind of technology of effective control continuous casting steel billet center segregation, and the force value of controlling light reduction section hydraulic cylinder is controlled the light reduction section continuous casting billet inner arc side water yield at 6-12m simultaneously at 1200-1500KN
3Between/the h, the light reduction section continuous casting billet outer arc side water yield is at 9-15m
3Between/the h, the tundish molten steel overheat is at 20-30 ℃, and the conticaster pulling rate is between 0.65m/min-1.05m/min, with the effective length that guarantees that effective enforcement is gently depressed.
The present invention has advantage and effect: (1) is through increasing the intensity of cooling on light reduction section continuous casting billet surface; Reach the continuous casting billet surface purpose consistent with the core amount of remaining retracted; Controlled the degree of center segregation to a certain extent; Reduced control continuous casting billet center segregation merely to the dependence of light reduction section cylinder pressure, increased the service life of equipment, guaranteed effective control the continuous casting billet center segregation.(2) simple and easy to do, can realize effective control easily to center segregation.
The specific embodiment
Embodiment 1:
Certain steel mill has adopted method of the present invention to 320mm * 1800-2000mm medium carbon low alloy steel continuous casting steel billet; The average degree of superheat of tundish molten steel is 21 ℃; Pulling rate is 0.70m/min; Light reduction section cylinder pressure value is controlled between the 1250-1300KN, and the light inside and outside arc side of the reduction section continuous casting billet water yield is controlled at 8m respectively
3/ h and 10m
3/ h, continuous casting billet macroscopic examination center segregation rank is a C class 1.0.
Embodiment 2:
Certain steel mill has adopted method of the present invention to 350mm * 1850-2150mm straight carbon steel continuous casting steel billet; The average degree of superheat of tundish molten steel is 18 ℃; Pulling rate is 0.75m/min; Light reduction section cylinder pressure value is controlled between the 1250-1400KN, and the light inside and outside arc side of the reduction section continuous casting billet water yield is controlled at 10m respectively
3/ h and 12m
3/ h, continuous casting billet macroscopic examination center segregation rank is a C class 1.0.
Embodiment 3:
Certain steel mill has adopted method of the present invention to 300mm * 1900-2150mm mild steel continuous casting steel billet; The average degree of superheat of tundish molten steel is 25 ℃; Pulling rate is 0.85m/min; Light reduction section cylinder pressure value is controlled between the 1300-1430KN, and the light inside and outside arc side of the reduction section continuous casting billet water yield is controlled at 9m respectively
3/ h and 10m
3/ h, continuous casting billet macroscopic examination center segregation rank is a C class 0.5.
Claims (1)
1. effective technology of control continuous casting steel billet center segregation, it is characterized in that: the force value of controlling light reduction section hydraulic cylinder is controlled the light reduction section continuous casting billet inner arc side water yield at 6-12m simultaneously at 1200-1500KN
3Between/the h, the light reduction section continuous casting billet outer arc side water yield is at 9-15m
3Between/the h, the tundish molten steel overheat is at 20-30 ℃, and the conticaster pulling rate is between 0.65m/min-1.05m/min, with the effective length that guarantees that effective enforcement is gently depressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102601442A CN101934357B (en) | 2010-08-23 | 2010-08-23 | Process for effectively controlling central segregation of continuous cast slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102601442A CN101934357B (en) | 2010-08-23 | 2010-08-23 | Process for effectively controlling central segregation of continuous cast slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101934357A CN101934357A (en) | 2011-01-05 |
| CN101934357B true CN101934357B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102601442A Active CN101934357B (en) | 2010-08-23 | 2010-08-23 | Process for effectively controlling central segregation of continuous cast slab |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921914B (en) * | 2012-12-01 | 2014-06-04 | 新余钢铁集团有限公司 | Heavy reduction technology for improving center segregation and center porosity of super-thick slabs |
| CN106270439B (en) * | 2016-09-30 | 2018-06-12 | 中冶赛迪工程技术股份有限公司 | A kind of Spraying Water of Nozzles in Secondary Cooling method for improving continuous casting billet gross segregation |
| CN107127315B (en) * | 2017-04-12 | 2019-04-05 | 东北大学 | A kind of production method and its device of low internal flaw continuous casting heavy slab |
| CN108160964B (en) * | 2017-12-26 | 2019-12-31 | 首钢集团有限公司 | Method for continuously casting phosphorus-containing steel plate blank |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2311911Y (en) * | 1997-08-10 | 1999-03-24 | 大连理工大学 | Composite electromagnetic inductor |
| CN101362195A (en) * | 2008-09-12 | 2009-02-11 | 攀钢集团研究院有限公司 | Bloom continuous-casting dynamic gentle pressure amount control method- |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4998734B2 (en) * | 2007-11-13 | 2012-08-15 | Ｊｆｅスチール株式会社 | Manufacturing method of continuous cast slab |
| JP5600929B2 (en) * | 2008-12-10 | 2014-10-08 | Ｊｆｅスチール株式会社 | Manufacturing method of continuous cast slab |
-
2010
- 2010-08-23 CN CN2010102601442A patent/CN101934357B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2311911Y (en) * | 1997-08-10 | 1999-03-24 | 大连理工大学 | Composite electromagnetic inductor |
| CN101362195A (en) * | 2008-09-12 | 2009-02-11 | 攀钢集团研究院有限公司 | Bloom continuous-casting dynamic gentle pressure amount control method- |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2009-119486A 2009.06.04 |
| JP特开2010-158719A 2010.07.22 |
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| CN101934357A (en) | 2011-01-05 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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