CN101138785A - Method of continuous casting of cogged ingot - Google Patents
Method of continuous casting of cogged ingot Download PDFInfo
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- CN101138785A CN101138785A CNA2007102021619A CN200710202161A CN101138785A CN 101138785 A CN101138785 A CN 101138785A CN A2007102021619 A CNA2007102021619 A CN A2007102021619A CN 200710202161 A CN200710202161 A CN 200710202161A CN 101138785 A CN101138785 A CN 101138785A
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Abstract
The present invention discloses a continuous casting technology, which can greatly reduce defects of a cogged ingot of bloom continuous casting. A technical scheme of the present invention is: the continuous casting technology of the cogged ingot comprises double cooling of solidified shell, wherein the solidified shell goes through five shower cooling areas in sequence to be twice cooled. Cooling intensity in cooling direction of five shower cooling areas is as following: 151 to 1941/ (min is multiplied by m <SUP> 2 </SUP>), 24 to 501/ (min is multiplied by m <SUP> 2 </SUP>), 23 to 351/ (min is multiplied by m <SUP> 2 </SUP>), 12 to 191 / (min is multiplied by m <SUP> 2 </SUP>) and 8 to 111 / (min is multiplied by m <SUP> 2 </SUP>). The present invention gradually reduces the cooling intensity of the solidified shell with the solidified shell thickening, thereby effectively reducing inside and outside difference in temperature of the solidified shell, decreasing heat stress of the solidified shell and reducing defects of the bloom continuous casting. The present invention is especially suitable for the cogged ingot of bloom continuous casting with a cross of 450mm multiplied 360mm that is made up of medium-carbon ferromanganese such as 35Mn2 and 37 Mn2.
Description
Technical field
The present invention relates to the continuous cast method in the Ferrous Metallurgy field, relate in particular to the secondary process for cooling in the bloom continuous casting process.
Background technology
At present, high strength shaped steel, round steel and seamless steel pipe etc. are mainly produced strand by the method for continuous casting to internal soundness and the strict steel grade of compression ratio, strand is rolled obtains finished product at last again.Section configuration according to strand can be divided into strand square billet, circle base and slab etc.In casting process, molten steel flows into conticaster from converter, and carries out the cooling first time in the crystallizer of conticaster, tentatively is frozen into to have certain thickness base shell; The base shell is pulled out from the crystallizer end opening continuously, and enters secondary cooling zone in the conticaster and carry out the secondary cooling, and cooling is frozen into strand to the base shell fully through secondary.The secondary cooling is an important step in the whole continuous casting production process, and the formation of defectives such as slab surface crack and underbead crack all has closely with the secondary cooling gets in touch.
With the 35Mn2 tube blank steel is example, and this steel grade belongs to medium carbon manganese steel, poor thermal conductivity.If the secondary intensity of cooling is excessive, with increasing the internal-external temperature difference of strand, produce thermal stress, increase the danger of casting blank crack, especially solidify the early stage cooled off strong, the solidification front thermograde is big, impels column crystal to increase rapidly, and low melting point, low solubility element constantly spread from dendrite and separate out, form enrichment at solidification front, the high temperature that further worsens and reduce steel prolongs the plasticity energy, and the fragility of steel increases, critical strain values diminishes the big more easy more generation middle crack of casting blank cross-section size; If but secondary intensity of cooling deficiency will cause solidified shell too thin, strand intensity at high temperature is low, and base shell generation creep and produce bulge causes the molten steel of interdendritic impurity enriched to move to the liquid core core, the generation of aggravation strand centre burst; In addition, if the secondary inhomogeneous cooling of base shell is even,, is through to casting billet surface when serious and forms surface longitudinal crack because of the backheat excessive strong medium carbon manganese steel strand of crack sensitivity that also easily causes in base shell surface produces middle crack.Therefore, only secondary cooling method reasonable in design in casting process just can prevent the generation of casting billet surface lobe and underbead crack.At present, the main technological parameter of control secondary cooling performance has: cooling water inflow, represent with employed cooling water volume of unit interval usually; Specific water, the i.e. employed cooling water volume of Unit Weight molten steel; Intensity of cooling is represented with employed cooling water inflow on the unit are; Pulling rate, the unit interval is pulled out the length of strand etc.
" Sichuan metallurgy " magazine (the 8th～10 page of the 27th the 3rd phase of volume in June, 2005, change 21 pages, casting parameters is to the pre-test that influences of circular pipe blank internal soundness, Ma Huanyu, Zhang Min, among Lee, Peng can carve, and Hu Maohui Bai Bingzhu) has reported the measure of optimizing continuous casting secondary process for cooling in the literary composition, improve the punching quality of 20# steel φ 200mm and φ 280mm circle strand, reduced tube rolling invagination defective.Reported by the measures such as water distribution system of control continuous casting secondary cooling in " Hunan metallurgy " magazine in July, 2002 (the 28th～30 page of the 4th phase, the carbon element tube blank steel face crack origin cause of formation and controlling of production process, Liao Qiaoliang work), slab surface crack is obviously reduced.Above-mentioned research all at steel grade be the 20# steel, and the strand dimensions of producing is less, is respectively the round strand of φ 200mm and φ 280mm and the little square billet that cross dimension is 200mm * 200mm.And for the bloom of cross dimensions greater than 200mm * 200mm, especially cross dimension reaches the medium carbon manganese steel strand of 450mm * 360mm, as cross dimension is the 35Mn2 tube blank steel bloom of 450mm * 360mm, because its casting blank cross-section size is big, make that the internal-external temperature difference of strand is big, the thermal stress that produces is also big, and the tendentiousness that strand produces implosion is stronger; And the thermal conductivity of medium carbon manganese steel such as 35Mn2,37Mn2 is poor than mild steel such as 20# steel, and the sensitiveness that strand produces middle crack is stronger.Therefore, for the square casting blanks of dimensions greater than 200mm * 200mm and poor thermal conductivity, use existing continuous cast method, defectives such as the face crack of strand and underbead crack are serious.
Summary of the invention
Technical problem to be solved by this invention is: a kind of continuous cast method that can reduce the bloom continuous casting defective is provided, improves the quality of steel billet.
Solving the problems of the technologies described above employed technical scheme is: the continuous cast method of bloom, comprise secondary cooling to the base shell, wherein the base shell carries out the secondary cooling by five spraying and cooling area successively, and five spraying and cooling area are respectively 151～194L/ (min * m along base shell cooling direction intensity of cooling
2), 34～50L/ (min * m
2), 23～35L/ (min * m
2), 12～19L/ (min * m
2), 8～11L/ (min * m
2).
As further improvement in the technical proposal, when passing through first spraying and cooling area, adopt on the base shell water spray to force cooling, all the other spraying and cooling area employing aerosol spray coolings.
As further improvement in the technical proposal, the base shell carries out the secondary cooling with the pulling rate of 0.3～0.6m/min, and the specific water of secondary cooling is 0.392～0.553L/kg.
As further improvement in the technical proposal, the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy are controlled respectively.
As further improvement in the technical proposal, the ratio of wide cooling water inflow of base shell and base shell leptoprosopy cooling water inflow equals the ratio of wide of base shell and the width of base shell leptoprosopy.
As further improvement in the technical proposal, the length of each spraying and cooling area changes successively.
As further improvement in the technical proposal, the length of each spraying and cooling area is respectively 0.2～0.4m, 1.5～2.5m, 1.5～2.5m, 4.5～5.5m, 4.0～5.0m along base shell cooling direction.
As the preferred version of technique scheme, described bloom is a medium carbon manganese steel bloom, and its cross dimension is 450mm * 360mm.
As the preferred version of technique scheme, described bloom is 35Mn2 or 37Mn2 medium carbon manganese steel bloom.
The invention has the beneficial effects as follows: because base shell thickness in cooling procedure becomes big gradually, the present invention passes through the qualification to the intensity of cooling of each spraying and cooling area in the secondary cooling zone, can in the process of base shell cooling thickening, reduce intensity of cooling gradually to the base shell, thereby effectively reduce the internal-external temperature difference of base shell, reduce the thermal stress of square billet, prevent the generation of square billet face crack and underbead crack, reduced the continuous casting defective of bloom; First spraying and cooling area adopts water spray to force cooling, can improve intensity of cooling, guarantee that the thin solidified shell of crystallizer outlet obtains high-intensity cooling, increase thickness of solidified slab shell in secondary rapidly, help preventing changing the bleed-out accident that seriously causes because of the thin bulge of crystallizer outlet base shell, and it is thicker at spraying and cooling area base shell subsequently, adopt the cooling of aerosol spray, because of the aerosol cooling can obviously reduce intensity of cooling and improve cooling uniformity, thereby can effectively reduce the internal-external temperature difference and the consequent thermal stress of base shell, reduce the danger that square billet produces underbead crack; By the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy are controlled separately, can make wide intensity of cooling of base shell consistent with base shell leptoprosopy, prevent that bloom is because of the even corner crack that produces of width face inhomogeneous cooling; Change successively by length, can in the process of base shell cooling thickening, strengthen the length of drenching the cooling zone, thereby improve the uniformity, the base shell can slowly be cooled off uniformly the cooling of base shell with each spraying and cooling area; By in five spraying and cooling area to the setting of the minimum cooling water inflow of wide of base shell, leptoprosopy, can avoid weakening, and the atomizing effect when guaranteeing the cooling of aerosol spray because of the cooling water inflow deficiency causes the intensity of cooling in the spraying and cooling area.It is 450mm * 360mm that the present invention especially is fit to cross dimension, and material is the continuous casting production of medium carbon manganese steel blooms such as 35Mn2 or 37Mn2.
The specific embodiment
The continuous cast method of bloom of the present invention comprises the secondary cooling to the base shell, and wherein the base shell carries out the secondary cooling by five spraying and cooling area successively, and five spraying and cooling area are respectively 151～194L/ (min * m along base shell cooling direction intensity of cooling
2), 34～50L/ (min * m
2), 23～35L/ (min * m
2), 12～19L/ (min * m
2), 8～11L/ (min * m
2).Because base shell thickness in cooling procedure becomes big gradually, the present invention passes through the qualification to the intensity of cooling of each spraying and cooling area in the secondary cooling zone, can in the process of base shell cooling thickening, reduce intensity of cooling gradually to the base shell, thereby effectively reduce the internal-external temperature difference of base shell, reduce the thermal stress of square billet, prevent the generation of square billet face crack and underbead crack.
Adopting when in addition, the base shell is by first spraying and cooling area sprays water forces cooling, all the other spraying and cooling area to adopt the aerosol spray to cool off.First spraying and cooling area adopts water spray to force cooling, can improve intensity of cooling, guarantee that the thin solidified shell of crystallizer outlet obtains high-intensity cooling, increase thickness of solidified slab shell in secondary rapidly, help preventing changing the bleed-out accident that seriously causes because of the thin bulge of crystallizer outlet base shell, and it is thicker at spraying and cooling area base shell subsequently, adopt the cooling of aerosol spray, because of the aerosol cooling can obviously reduce intensity of cooling and improve cooling uniformity, thereby can effectively reduce the internal-external temperature difference and the consequent thermal stress of base shell, reduce the danger that square billet produces underbead crack.
In addition, the base shell carries out the secondary cooling with the pulling rate of 0.3～0.6m/min, and the specific water of secondary cooling is 0.392～0.553L/kg.
In addition, the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy are controlled respectively.By the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy are controlled respectively, can set the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy respectively according to the width of wide of base shell and base shell leptoprosopy, wherein, the ratio that can guarantee the cooling water inflow of the cooling water inflow of wide of base shell and base shell leptoprosopy equals the ratio of wide of base shell and the width of base shell leptoprosopy, can make wide intensity of cooling of base shell consistent like this, prevent that bloom is because of the even corner crack that produces of width face inhomogeneous cooling with base shell leptoprosopy.
In order to improve the uniformity to the cooling of base shell, the base shell can slowly be cooled off uniformly, the length of each spraying and cooling area changes successively.Change successively by length, can in the process of base shell cooling thickening, strengthen the length of drenching the cooling zone, thereby improve the uniformity the cooling of base shell with each spraying and cooling area.Wherein, the length of each spraying and cooling area is respectively 0.2～0.4m, 1.5～2.5m, 1.5～2.5m, 4.5～5.5m, 4.0～5.0m along base shell cooling direction.
Wherein, described bloom is that cross dimension is 450mm * 360mm, and material is medium carbon manganese steel blooms such as 35Mn2 or 37Mn2.
Embodiment 1
Continuous casting production cross dimension is the 35Mn2 tube blank steel bloom of 450mm * 360mm, and wherein the base shell carries out the secondary cooling by five spraying and cooling area successively with the pulling rate of 0.3m/min, and the specific water of secondary cooling is 0.553L/kg; The length of five spraying and cooling area is respectively 0.252m along base shell cooling direction, 1.948m, 2.035m, 5.060m, 4.609m, and five spraying and cooling area are all controlled respectively the cooling water inflow of base shell width and the cooling water inflow of shell thickness direction, and guarantee the ratio 1.25: 1 of the cooling water inflow of the cooling water inflow of wide of base shell and base shell leptoprosopy; In addition, five spraying and cooling area are respectively along base shell cooling direction intensity of cooling: the intensity of cooling of its width and thickness direction is 151L/ (min * m during first spraying and cooling area of base shell process
2); The base shell during through second spraying and cooling area the intensity of cooling of its width and thickness direction be 34L/ (min * m
2); The base shell during through the 3rd spraying and cooling area the intensity of cooling of its width and thickness direction be 23L/ (min * m
2); The base shell during through the 4th spraying and cooling area the intensity of cooling of its width and thickness direction be 12L/ (min * m
2); The base shell during through the 5th spraying and cooling area the intensity of cooling of its width and thickness direction be 8L/ (min * m
2).Adopting the pressure cooling of spraying water, base shell to adopt aerosol to spray by all the other spraying and cooling area when wherein, the base shell is by first spraying and cooling area cools off.
After casting finishes, the bloom of producing is carried out surface quality and macrostructure check, assay shows strand depth of chatter mark≤0.5mm, casting billet surface does not have longitudinal crack, inner no middle crack and centre burst defective, strand does not have the cleaning rate and reaches 100%, and does not have the surface longitudinal crack defective by the big specification circular pipe blank of φ 350mm that this bloom base rolls into.
Embodiment 2
Continuous casting production cross dimension is the 37Mn2 tube blank steel bloom of 450mm * 360mm, and wherein the base shell carries out the secondary cooling by five spraying and cooling area successively with the pulling rate of 0.6m/min, and the specific water of secondary cooling is 0.392L/kg; The length of five spraying and cooling area is respectively 0.252m along base shell cooling direction, 1.948m, 2.035m, 5.060m, 4.609m, and five spraying and cooling area are all controlled respectively the cooling water inflow of base shell width and the cooling water inflow of shell thickness direction, and guarantee the ratio 1.25: 1 of the cooling water inflow of the cooling water inflow of wide of base shell and base shell leptoprosopy; Five spraying and cooling area are respectively along base shell cooling direction intensity of cooling in addition: the intensity of cooling of its width and thickness direction is 194L/ (min * m during first spraying and cooling area of base shell process
2); The base shell during through second spraying and cooling area the intensity of cooling of its width and thickness direction be 50L/ (min * m
2); The base shell during through the 3rd spraying and cooling area the intensity of cooling of its width and thickness direction be 35L/ (min * m
2); The base shell during through the 4th spraying and cooling area the intensity of cooling of its width and thickness direction be 19L/ (min * m
2); The base shell during through the 5th spraying and cooling area the intensity of cooling of its width and thickness direction be 11L/ (min * m
2).Adopting the pressure cooling of spraying water, base shell to adopt aerosol to spray by all the other spraying and cooling area when wherein, the base shell is by first spraying and cooling area cools off.
After casting finishes, the bloom of producing is carried out surface quality and macrostructure check, assay shows strand depth of chatter mark≤0.5mm, casting billet surface does not have longitudinal crack, inner no middle crack and centre burst defective, strand does not have the cleaning rate and reaches 100%, and does not have the surface longitudinal crack defective by the big specification circular pipe blank of φ 350mm that this bloom base rolls into.
Claims (9)
1. the continuous cast method of bloom comprises the secondary cooling to the base shell, and it is characterized in that: the base shell carries out the secondary cooling by five spraying and cooling area successively, and five spraying and cooling area are respectively 151～194L/ (min * m along base shell cooling direction intensity of cooling
2), 34～50L/ (min * m
2), 23～35L/ (min * m
2), 12～19L/ (min * m
2), 8～11L/ (min * m
2).
2. the continuous cast method of bloom as claimed in claim 1 is characterized in that: adopt water spray to force cooling when the base shell passes through first spraying and cooling area, all the other spraying and cooling area employing aerosol spray coolings.
3. the continuous cast method of bloom as claimed in claim 1 is characterized in that: the base shell carries out the secondary cooling with the pulling rate of 0.3～0.6m/min, and the specific water of secondary cooling is 0.392～0.553L/kg.
4. the continuous cast method of bloom as claimed in claim 1 is characterized in that: the cooling water inflow of wide of base shell and the cooling water inflow of base shell leptoprosopy are controlled respectively.
5. the continuous cast method of bloom as claimed in claim 4 is characterized in that: the ratio of wide cooling water inflow of base shell and base shell leptoprosopy cooling water inflow equals the ratio of wide of base shell and the width of base shell leptoprosopy.
6. as the continuous cast method of any described bloom of claim in the claim 1～5, it is characterized in that: the length of each spraying and cooling area changes successively.
7. the continuous cast method of bloom as claimed in claim 6 is characterized in that: the length of each spraying and cooling area is respectively 0.2～0.4m, 1.5～2.5m, 1.5～2.5m, 4.5～5.5m, 4.0～5.0m along base shell cooling direction
8. as the continuous cast method of any described bloom of claim in the claim 1～5, it is characterized in that: described bloom is a medium carbon manganese steel bloom, and its cross dimension is 450mm * 360mm.
9. the continuous cast method of bloom as claimed in claim 8, it is characterized in that: described bloom is 35Mn2 or 37Mn2 medium carbon manganese steel bloom.
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|---|---|---|---|
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|---|---|---|---|
| CNB2007102021619A CN100542715C (en) | 2007-10-19 | 2007-10-19 | The continuous cast method of 450mm * 360mm medium carbon manganese steel bloom |
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| CN100542715C CN100542715C (en) | 2009-09-23 |
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| SU1379079A1 (en) * | 1986-03-25 | 1988-03-07 | Предприятие П/Я Р-6760 | Method of secondary cooling of unequal octahedral continuously cast ingots of alloyed steel |
| CN1640583A (en) * | 2004-01-06 | 2005-07-20 | 朱萃汉 | Continuous-casting two-cooling-chamber casting blank gas cooling method and apparatus thereof |
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| CN1990139A (en) * | 2005-12-26 | 2007-07-04 | 天津钢管集团有限公司 | Technique for preventing casting blank bending |
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| CN102371350B (en) * | 2010-08-25 | 2013-04-10 | 攀钢集团钢铁钒钛股份有限公司 | Continuous casting method of electrical steel |
| CN102398000A (en) * | 2010-09-13 | 2012-04-04 | 攀钢集团钢铁钒钛股份有限公司 | Continuous casting method for high-pressure gas cylinder steel |
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| CN104550790A (en) * | 2013-10-09 | 2015-04-29 | 宝钢特钢有限公司 | Slab continuous casting manufacturing method for medium-manganese wear-resistant steel |
| CN104607609A (en) * | 2015-03-05 | 2015-05-13 | 中冶赛迪工程技术股份有限公司 | Secondary cooling nozzle arranging method for improving surface plasticity of casting blank and secondary cooling control method |
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| CN111992686A (en) * | 2020-09-03 | 2020-11-27 | 福建三钢闽光股份有限公司 | Aerial fog full-water combined cooling high-carbon steel continuous casting production method |
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