CN103464711A - Method for solving bloom internal segregation - Google Patents
Method for solving bloom internal segregation Download PDFInfo
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- CN103464711A CN103464711A CN2013103863126A CN201310386312A CN103464711A CN 103464711 A CN103464711 A CN 103464711A CN 2013103863126 A CN2013103863126 A CN 2013103863126A CN 201310386312 A CN201310386312 A CN 201310386312A CN 103464711 A CN103464711 A CN 103464711A
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Abstract
The invention relates to the field of steelmaking slab continuous casting, in particular to a method for solving bloom internal segregation. The method is characterized in that during continuous casting, pulling-straightening roller pressing is adopted in an interval with casting blank pulling rate of 0.6-0.85m/min and solid phase ratio of 0.7-0.9, roller seam openness of a pulling-straightening machine is controlled precisely, pressing reduction is allowed to be 10-20mm, and accordingly segregation index of the finished wire rolled by the casting blanks can be controlled below 1.05, and internal cracks can be avoided. A circumference boss is disposed in the middle of t he surface of the pulling-straightening roller. Slopes with the inclination of 1:3-1:10 are respectively disposed between the two ends of the circumference boss and the roller faces of the pulling-straightening roller. Compared with the prior art, the method has the advantages that high-carbon steel with carbon content above 0.80% is used, the segregation index of the finished wire rolled by the casting blanks can be controlled below 1.05, internal segregation of the casting blanks can be lowered evidently, and central cracks can be avoided.
Description
Technical field
The present invention relates to process for making sheet billet continuous casting field, relate in particular to a kind of method that solves the inner segregation of bloom.
Background technology
In current process for making, the continuous casting of carbon steel, low-alloy steel, steel and other special steel is the technology that vertical curved conticaster just grows up after going into operation 20 years.Although compare with die casting, continuous casting is all having superiority aspect the output of product and quality, but the requirement in the age of at present pursuing quality to steel product quality improves day by day, and could not obtain fine solution to center segregation and the center porosity of the mass formation material impact of product always.Present stage solves the inner segregation main method of bloom to be had following several: the aspect technology such as electromagnetic agitating technology, light Reduction Technology, the general strand drafts of light drafts that adopts is in 5mm, but owing to being subject to various technical limitations, can not further solve the inner segregation problem of strand, finished product high-carbon steel (carbon content is more than 0.80%) the carbon segregation index that strand is rolled into wire rod is many more than 1.10.
Summary of the invention
The purpose of this invention is to provide a kind of method that solves the inner segregation of bloom, under existing conticaster equipment condition, drafts and opportunity by the control withdrawal straightening machine to strand, reduce the inner segregation of strand, improve Inner Quality of Billet.
For achieving the above object, the present invention adopts following technical scheme to realize:
A kind of method that solves the inner segregation of bloom, be 0.6～0.85m/min, admittedly be in a ratio of in 0.7～0.9 interval and take pulling-straightening roller to depress greatly scheme at Casting speed in casting process, accurately control the tension leveler roller seam opening degree, make drafts at 10～20mm, the finished product carbon segregation index that final strand is rolled into wire rod can control to below 1.05, avoids inside crack defect to occur simultaneously.
Describedly depress greatly the upper pulling-straightening roller that scheme is withdrawal straightening machine and depress, lower pulling-straightening roller is motionless.
The surface of described pulling-straightening roller is provided with the circumference boss between two parties, and the circumference boss height is 5～30mm, and circumference boss width is 10～50% of pulling-straightening roller roll surface effective length, between circumference boss two ends and pulling-straightening roller roll surface, is respectively equipped with the inclined-plane that gradient is 1:3～1:10.
By adopt the convex surface pulling-straightening roller make solid-liquid two-phase region at the width of bloom in compressive state, while making the bloom cross-section central area compressed, the solid-liquid two-phase region of bloom width is also compressed, both sides, the bloom cross section shape that remains unchanged, thus realize guarantee final strand be rolled into the finished product carbon segregation index of wire rod in inner flawless defect.
Compared with prior art, the invention has the beneficial effects as follows: be applied to carbon content at the high-carbon steel more than 0.80%, the finished product carbon segregation index that strand is rolled into wire rod can control to below 1.05, can significantly reduce the inner segregation of strand, improve the internal soundness of strand, avoid the generation of centre burst defect simultaneously.
The accompanying drawing explanation
It in Fig. 1, is pulling-straightening roller structural representation of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
A kind of method that solves the inner segregation of bloom of the present invention, take the bloom casting blank section as 280mm * 380mm, produce the 80# steel, wire rod rolling 5.5mm dish circle is example: in casting process, at Casting speed, be 0.85m/min, admittedly be in a ratio of in 0.81 interval and take single roller to depress greatly, accurately control the tension leveler roller seam opening degree, make the drafts of upper roll at 20mm, lower rollers is motionless, the finished product carbon segregation index that final strand is rolled into wire rod is 1.05, inner flawless defect.
Embodiment 2
A kind of method that solves the inner segregation of bloom of the present invention, take the bloom casting blank section as 280mm * 380mm, produce the 82B steel, wire rod rolling 5.5mm dish circle is example: in casting process, at Casting speed, be 0.75m/min, admittedly be in a ratio of in 0.88 interval and take single roller to depress greatly, accurately control the tension leveler roller seam opening degree, make the drafts of upper roll at 17mm, lower rollers is motionless, the finished product carbon segregation index that final strand is rolled into wire rod is 1.04, inner flawless defect.
Embodiment 3
A kind of method that solves the inner segregation of bloom of the present invention, take the bloom casting blank section as 280mm * 380mm, produce the 80B steel, wire rod rolling 5.5mm dish circle is example: in casting process, at Casting speed, be 0.80m/min, admittedly be in a ratio of in 0.85 interval and take single roller to depress greatly, accurately control the tension leveler roller seam opening degree, make the drafts of upper roll at 15mm, lower rollers is motionless, the finished product carbon segregation index that final strand is rolled into wire rod is 1.03, inner flawless defect.
See that Fig. 1 is the pulling-straightening roller structural representation in above-described embodiment, the surface of pulling-straightening roller is provided with the circumference boss between two parties, circumference boss height H is 5～30mm, circumference boss width L be 100mm account for pulling-straightening roller roll surface effective length 13%, be respectively equipped with the inclined-plane that gradient is 1:8.5 between circumference boss two ends and pulling-straightening roller roll surface, the corner's rounding between the corner of circumference boss and circumference boss and pulling-straightening roller roll surface.
Claims (3)
1. a method that solves the inner segregation of bloom, it is characterized in that, be 0.6～0.85m/min, admittedly be in a ratio of in 0.7～0.9 interval and take pulling-straightening roller to depress greatly scheme at Casting speed in casting process, accurately control the pulling-straightening roller gap opening degree, make drafts at 10～20mm, the finished product carbon segregation index that final strand is rolled into wire rod can control to below 1.05, avoids inside crack defect to occur simultaneously.
2. a kind of method that solves the inner segregation of bloom according to claim 1, is characterized in that, describedly depresses greatly the upper pulling-straightening roller that scheme is withdrawal straightening machine and depress, and lower pulling-straightening roller is motionless.
3. a kind of method that solves the inner segregation of bloom according to claim 1, it is characterized in that, the surface of described pulling-straightening roller is provided with the circumference boss between two parties, the circumference boss height is 5～30mm, circumference boss width is 10～50% of pulling-straightening roller roll surface effective length, between circumference boss two ends and pulling-straightening roller roll surface, is respectively equipped with the inclined-plane that gradient is 1:3～1:10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103863126A CN103464711A (en) | 2013-08-29 | 2013-08-29 | Method for solving bloom internal segregation |
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| CN2013103863126A CN103464711A (en) | 2013-08-29 | 2013-08-29 | Method for solving bloom internal segregation |
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| CN103464711A true CN103464711A (en) | 2013-12-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399924A (en) * | 2014-11-20 | 2015-03-11 | 东北大学 | Gradient curvature raised roller of tension leveler for cogged ingot continuous casting and use method |
| CN105834387A (en) * | 2016-05-18 | 2016-08-10 | 中冶连铸技术工程有限责任公司 | Reduction control method for continuous casting |
| CN106001475A (en) * | 2016-06-07 | 2016-10-12 | 东北特钢集团大连特殊钢有限责任公司 | Gradually-varied-curvature convex roller for continuously-cast alloy steel bloom, and heavy reduction process |
| CN107088650A (en) * | 2017-04-25 | 2017-08-25 | 中冶赛迪工程技术股份有限公司 | A kind of control method for improving continuous casting machine roll-gap precision |
| CN107774942A (en) * | 2017-10-31 | 2018-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
| CN112317725A (en) * | 2020-10-28 | 2021-02-05 | 南京钢铁股份有限公司 | Method for improving bearing steel casting blank core looseness and bidirectional heavy pressing device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775461A (en) * | 2010-01-19 | 2010-07-14 | 南京钢铁股份有限公司 | Method for improving central carbon segregation of tire cord steel |
| CN102310178A (en) * | 2011-07-08 | 2012-01-11 | 南阳汉冶特钢有限公司 | Method for solving center segregation of casting blank |
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN102921914A (en) * | 2012-12-01 | 2013-02-13 | 新余钢铁集团有限公司 | Heavy reduction technology for improving center segregation and center porosity of super-thick slabs |
| CN103121092A (en) * | 2013-03-22 | 2013-05-29 | 北京科技大学 | Continuous casting bloom soft press technology based on tail end electromagnetic stirring |
| CN103128247A (en) * | 2013-03-15 | 2013-06-05 | 北京科技大学 | Method for producing 60 mm extra-thick steel plates with low compression ratio |
-
2013
- 2013-08-29 CN CN2013103863126A patent/CN103464711A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775461A (en) * | 2010-01-19 | 2010-07-14 | 南京钢铁股份有限公司 | Method for improving central carbon segregation of tire cord steel |
| CN102310178A (en) * | 2011-07-08 | 2012-01-11 | 南阳汉冶特钢有限公司 | Method for solving center segregation of casting blank |
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN102921914A (en) * | 2012-12-01 | 2013-02-13 | 新余钢铁集团有限公司 | Heavy reduction technology for improving center segregation and center porosity of super-thick slabs |
| CN103128247A (en) * | 2013-03-15 | 2013-06-05 | 北京科技大学 | Method for producing 60 mm extra-thick steel plates with low compression ratio |
| CN103121092A (en) * | 2013-03-22 | 2013-05-29 | 北京科技大学 | Continuous casting bloom soft press technology based on tail end electromagnetic stirring |
Non-Patent Citations (1)
| Title |
|---|
| CHANG HO MOON等: "Effect of the Roll Surface Profile on Centerline Segregation in Soft Reduction Process", 《ISIJ INTERNATIONAL》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399924A (en) * | 2014-11-20 | 2015-03-11 | 东北大学 | Gradient curvature raised roller of tension leveler for cogged ingot continuous casting and use method |
| CN105834387A (en) * | 2016-05-18 | 2016-08-10 | 中冶连铸技术工程有限责任公司 | Reduction control method for continuous casting |
| CN105834387B (en) * | 2016-05-18 | 2018-06-12 | 中冶连铸技术工程有限责任公司 | Continuous casting pressing control method |
| CN106001475A (en) * | 2016-06-07 | 2016-10-12 | 东北特钢集团大连特殊钢有限责任公司 | Gradually-varied-curvature convex roller for continuously-cast alloy steel bloom, and heavy reduction process |
| CN107088650A (en) * | 2017-04-25 | 2017-08-25 | 中冶赛迪工程技术股份有限公司 | A kind of control method for improving continuous casting machine roll-gap precision |
| CN107088650B (en) * | 2017-04-25 | 2019-03-26 | 中冶赛迪工程技术股份有限公司 | A kind of control method improving continuous casting machine roll-gap precision |
| CN107774942A (en) * | 2017-10-31 | 2018-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
| CN107774942B (en) * | 2017-10-31 | 2019-12-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Sheet billet continuous casting is with convex sufficient roller and improves center segregation of continuous cast slab and loose method |
| CN112317725A (en) * | 2020-10-28 | 2021-02-05 | 南京钢铁股份有限公司 | Method for improving bearing steel casting blank core looseness and bidirectional heavy pressing device |
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Application publication date: 20131225 |
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