CN114101605A - Method for improving low-power quality of continuous casting billet for wide and thick plates - Google Patents
Method for improving low-power quality of continuous casting billet for wide and thick plates Download PDFInfo
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- CN114101605A CN114101605A CN202111408990.9A CN202111408990A CN114101605A CN 114101605 A CN114101605 A CN 114101605A CN 202111408990 A CN202111408990 A CN 202111408990A CN 114101605 A CN114101605 A CN 114101605A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for improving the low-power quality of a continuous casting billet for a wide and thick plate, belonging to the technical field of steel making. The method comprises the following steps: (1) adding a proper amount of Nb into the molten steel, and reducing the addition amount of Mn; (2) controlling the pouring speed and the superheat degree of the casting machine, and selecting the matched secondary cooling ratio water quantity according to the component range and the drawing speed; (3) and (4) carrying out pressure reduction treatment by adopting a solidification tail end dynamic incremental pressure reduction process. According to the invention, trace Nb is added from the components to replace part of Mn, so that the content of the easily segregated elements is reduced from the source. And (3) promoting equiaxial crystallization of a solidification structure by adopting low superheat degree pouring and optimizing secondary cooling and drawing speed parameters. The solidification shrinkage of the tail end of the casting blank is compensated by adopting technologies such as solidification tail end dynamic incremental reduction rate and the like so as to reduce bulging, eliminate or reduce internal gaps formed by the shrinkage of the casting blank and prevent solute elements enriched among crystals from flowing to the center of the casting blank. Compared with the prior art, the method is easy to operate, and the effects of improving the center segregation and the loosening of the casting blank are obvious.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a method for improving the low-power quality of a continuous casting billet for a wide and thick plate.
Background
The continuous casting billet is a basic raw material of steel, the quality of the continuous casting billet directly affects the process and physical properties of a product, and the low-power quality of the continuous casting billet, including center segregation, center porosity, intermediate cracks and the like, is an effective mode for evaluating the quality of the continuous casting billet. For the continuous casting blank for the medium plate, the center segregation and the center porosity defect become more and more main factors influencing the steel quality, influence the uniformity of the steel structure, reduce the steel plate shaping and low-temperature impact toughness indexes, particularly the lamellar tearing resistance in the thickness direction of the steel plate, and have adverse effects on the processing and the use of the steel.
Patent application CN1062925738A "improve low alloy high strength structural steel wide and thick board continuous casting billet homogeneity", discloses that through technical measures such as the tensile of stable casting machine, reduce tundish superheat degree, two cold dynamic control, solidification end heavy reduction control comprehensive application reduce the center segregation of low alloy high strength structure wide and thick board continuous casting billet, improve the continuous casting billet homogeneity degree, this method has certain effect to improving casting blank center segregation and loose. However, in the control process, the heavy pressing and the light pressing are combined, the position where the heavy pressing starts needs to be accurately judged, the control is complex, and the positions where the light pressing and the heavy pressing start cannot be stably transited, so that the bulging and the like are easily caused.
Patent application CN107081413A "method for improving high-rise building steel continuous casting billet center density", discloses that through stabilizing casting machine pulling speed, reducing tundish superheat degree, two cold dynamic control, solidification end heavy reduction control technical measures reduce the center porosity of high-rise building steel casting blank, and then improve casting blank center density, improve rolling material internal quality. The method has a certain improvement effect on the center of the high-construction steel casting blank, but the combination of light pressing and heavy pressing is needed, the position for starting the heavy pressing needs to be accurately judged, the control is complex, the positions under the light pressing and the heavy pressing cannot be stably transited, and the bulging and the like are easily caused.
Disclosure of Invention
Aiming at solving the problems of complex control method, easy bulging and the like when the low-power quality of the continuous casting billet is realized in the prior art, the invention provides a method for improving the low-power quality of the continuous casting billet for a wide and thick plate, and aims to solve the technical problems. According to the invention, trace Nb is added from the component design to replace part of Mn, so that the content of the easily segregated element is reduced from the source. And (3) promoting equiaxial crystallization of a solidification structure by adopting low superheat degree pouring and optimizing secondary cooling and drawing speed parameters. By adopting the technologies of dynamically increasing the reduction rate of the solidified tail end and the like, the solidified shrinkage of the tail end of the casting blank is compensated to reduce bulging, internal gaps formed by the shrinkage of the casting blank are eliminated or reduced, and solute elements enriched among crystals are prevented from flowing to the center of the casting blank, so that the effects of effectively improving the center segregation and the center porosity of the casting blank are achieved, and the wide and thick plate has better effects on improving the processing and the formability of a wide and thick plate.
The technical scheme of the invention is as follows:
a method for improving the low power quality of a continuous casting billet for a wide and thick plate comprises the following steps:
(1) designing components: adding a proper amount of Nb into the molten steel, reducing the addition of Mn, and reducing the segregation tendency in the molten steel solidification process from the source;
(2) in the continuous casting process, the pouring speed and the superheat degree of a casting machine are controlled, and the matched secondary cooling specific water quantity is selected according to the component range and the drawing speed through a secondary cooling water distribution model;
(3) and (4) carrying out pressure reduction treatment by adopting a solidification tail end dynamic incremental pressure reduction process.
Preferably, in the step (1), the molten steel comprises the following components in percentage by mass: 0.14 to 0.20 percent of C, 0.15 to 0.30 percent of Si, 0.010 to 0.015 percent of Nb, 0.95 to 1.15 percent of Mn, 0.010 to 0.015 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance of Fe.
Preferably, in the step (2), the casting speed is 0.85-1.0 m/min.
Preferably, in the step (2), the degree of superheat is 15-30 ℃.
Preferably, in the step (2), the secondary cooling specific water amount is 0.10-0.15L/kg.
Preferably, in the step (3), the pressing process is as follows: starting from the central solid phase rate of the casting blank of 0.6, adopting soft reduction, wherein the initial reduction rate is 1.0-1.5 mm/m, and carrying out dynamic incremental reduction rate at the rate increment of 0.03-0.05 mm/m until the solidification end.
Preferably, after the casting is finished, the cross section of the continuous casting billet is taken according to the requirements of GBT 226-.
Preferably, the section size of the continuous casting billet is 300mm multiplied by 1800mm to 2200 mm.
The invention has the beneficial effects that:
according to the invention, trace Nb is added from the component design to replace part of Mn, so that the content of easily segregated elements is reduced from the source; and (3) promoting equiaxial crystallization of a solidification structure by adopting low superheat degree pouring and optimizing secondary cooling and drawing speed parameters. The solidification shrinkage of the tail end of the casting blank is compensated by adopting technologies such as solidification tail end dynamic incremental reduction rate and the like so as to reduce bulging, eliminate or reduce internal gaps formed by the shrinkage of the casting blank and prevent solute elements enriched among crystals from flowing to the center of the casting blank. Compared with the prior art, the method is easy to operate, and the effects of improving the center segregation and the loosening of the casting blank are obvious.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for improving the low power quality of a continuous casting billet for a wide and thick plate, wherein the Q355ND continuous casting slab with the section size of 300mm multiplied by 2000 mm; the method comprises the following steps:
(1) the molten steel composition is controlled as follows: 0.16 percent of C, 0.15 percent of Si, 0.010 percent of Nb, 0.98 percent of Mn, 0.010 percent of Ti, 0.018 percent of P, 0.010 percent of S and the balance of Fe,
(2) in the continuous casting process, the casting machine is controlled to be pulled at a casting speed of 0.85m/min, the casting speed is kept stable and unchanged, and the superheat degree of molten steel in a tundish is 15 ℃; the specific water amount of secondary cooling in the secondary cooling water distribution model is 0.10L/kg;
(3) adopting dynamic incremental reduction of a solidification tail end; starting to reduce at a reduction rate of 1.0mm/m when the central solid phase rate of the casting blank is 0.6, increasing the reduction rate at increments of 0.03mm/m, starting to reduce from 6 sections, increasing to 1.49mm/m after 16.47min, and ending the total reduction of 20.5mm until the solidification end;
(4) after pouring, the cross section of the continuous casting billet is taken according to the GBT 226-; the test result shows that the center segregation of the casting blank is C1.0, and no center porosity exists.
Example 2
A method for improving the low power quality of a continuous casting slab for a wide and thick plate, wherein the Q355ND continuous casting slab with the section size of 300mm multiplied by 1820 mm; the method comprises the following steps:
(1) the molten steel composition is controlled as follows: 0.16 percent of C, 0.20 percent of Si, 0.013 percent of Nb, 1.05 percent of Mn, 0.018 percent of Ti, 0.018 percent of P, 0.010 percent of S and the balance of Fe,
(2) in the continuous casting process, the casting machine is controlled to be pulled at a casting speed of 0.90m/min, the casting speed is kept stable and unchanged, and the superheat degree of molten steel in a tundish is 25 ℃; the specific water amount of secondary cooling in the secondary cooling water distribution model is 0.12L/kg;
(3) adopting dynamic incremental reduction of a solidification tail end; starting to reduce the central solid phase rate of the casting blank at a reduction rate of 1.2mm/m when the central solid phase rate of the casting blank is 0.6, increasing the reduction rate at increments of 0.04mm/m, starting to reduce from 6 sections, increasing the reduction rate to 1.822mm/m after 15.55min, and ending the total reduction of 23.496mm until the solidification end;
(4) after pouring, the cross section of the continuous casting billet is taken according to the GBT 226-; the test result shows that the center segregation of the casting blank is C1.0, and no center porosity exists.
Example 3
A method for improving the low power quality of a continuous casting billet for a wide and thick plate, wherein the Q355ND continuous casting slab with the section size of 300mm multiplied by 2100 mm; the method comprises the following steps:
(1) the molten steel composition is controlled as follows: 0.16 percent of C, 0.25 percent of Si, 0.015 percent of Nb, 1.15 percent of Mn, 0.020 percent of Ti, 0.018 percent of P, 0.010 percent of S and the balance of Fe,
(2) in the continuous casting process, the casting machine is controlled to be pulled at a casting speed of 1.0m/min, the casting speed is kept stable and unchanged, and the superheat degree of molten steel in a tundish is 30 ℃; the secondary cooling specific water amount in the secondary cooling water distribution model is 0.15L/kg;
(3) adopting dynamic incremental reduction of a solidification tail end; starting to reduce at a reduction rate of 1.5mm/m when the central solid phase rate of the casting blank is 0.6, increasing the reduction rate at increments of 0.05mm/m, starting to reduce from 6 sections, increasing to 2.2mm/m after 14min, and ending the total reduction of 25.9mm until the solidification end;
(4) after pouring, the cross section of the continuous casting billet is taken according to the GBT 226-; the test result shows that the center segregation of the casting blank is C1.0, and no center porosity exists.
Comparative example
A method for improving the low power quality of a continuous casting billet for a wide and thick plate, wherein the Q355ND continuous casting slab with the section size of 300mm multiplied by 2100 mm; the method comprises the following steps:
(1) the molten steel composition is controlled as follows: 0.16% of C, 0.25% of Si, 1.35% of Mn, 0.018% of P, 0.010% of S and the balance of Fe;
(2) in the continuous casting process, the casting machine is controlled to be pulled at a casting speed of 1.2m/min, the casting speed is kept stable and unchanged, and the superheat degree of molten steel in a tundish is 20 ℃; the specific water amount of secondary cooling in the secondary cooling water distribution model is 0.10L/kg;
(3) dynamic pressing is not adopted;
(4) after pouring, the cross section of the continuous casting billet is taken according to the GBT 226-; the inspection result shows that the center segregation of the casting blank is 2.0 of C type, the center porosity is 0.5, and the middle crack is 0.5.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The method for improving the low-power quality of the continuous casting billet for the wide and thick plate is characterized by comprising the following steps of:
(1) designing components: adding a proper amount of Nb into the molten steel, and reducing the addition amount of Mn;
(2) in the continuous casting process, the pouring speed and the superheat degree of a casting machine are controlled, and the matched secondary cooling specific water quantity is selected;
(3) and (4) carrying out pressure reduction treatment by adopting a solidification tail end dynamic incremental pressure reduction process.
2. The method for improving the macroscopic quality of the continuous casting billet for the wide and thick plate as claimed in claim 1, wherein in the step (1), the molten steel comprises the following components in percentage by mass: 0.14 to 0.20 percent of C, 0.15 to 0.30 percent of Si, 0.010 to 0.015 percent of Nb0.95 to 1.15 percent of Mn, 0.010 to 0.015 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance of Fe.
3. The method for improving the macroscopic quality of the continuous casting slab for the wide and thick slab as claimed in claim 1, wherein in the step (2), the casting speed is 0.85 to 1.0 m/min.
4. The method for improving the macroscopic quality of the continuous casting slab for the wide and thick slab as claimed in claim 1, wherein the degree of superheat in the step (2) is 15 to 30 ℃.
5. The method for improving the macroscopic quality of the continuous casting slab for the wide and thick slab as claimed in claim 1, wherein in the step (2), the secondary cooling specific water amount is 0.10 to 0.15L/kg.
6. The method for improving the macroscopic quality of the continuous casting slab for the wide and thick slab as claimed in claim 1, wherein in the step (3), the reduction process comprises: starting from the central solid phase rate of the casting blank of 0.6, adopting soft reduction, wherein the initial reduction rate is 1.0-1.5 mm/m, and carrying out dynamic incremental reduction rate at the rate increment of 0.03-0.05 mm/m until the solidification end.
7. The method for improving the low-power quality of the continuously cast slab for the wide and thick slabs as claimed in claim 1, wherein after the casting is finished, the cross section of the continuously cast slab is taken according to the requirements of GBT 226-.
8. The method for improving the low power quality of a continuous casting slab for a wide and thick slab as claimed in claim 1, wherein the sectional size of the continuous casting slab is 300mm x 1800mm to 2200 mm.
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| JP2011005524A (en) * | 2009-06-26 | 2011-01-13 | Jfe Steel Corp | Method for continuously casting high carbon steel |
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| CN106001476A (en) * | 2016-07-14 | 2016-10-12 | 东北大学 | Method for continuous casting billet two-stage continuous and dynamic heavy downward pressing |
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| CN109500371A (en) * | 2018-12-20 | 2019-03-22 | 南京钢铁股份有限公司 | A kind of slab dynamic secondary cooling and slighter compress control system |
| CN109518095A (en) * | 2019-01-03 | 2019-03-26 | 南京钢铁股份有限公司 | A kind of wide and thick slab and the production method for improving center portion segregation |
| CN110227806A (en) * | 2019-05-27 | 2019-09-13 | 北京首钢国际工程技术有限公司 | A kind of big screwdown gear of casting formula conticaster solidification end |
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2021
- 2021-11-24 CN CN202111408990.9A patent/CN114101605B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011005524A (en) * | 2009-06-26 | 2011-01-13 | Jfe Steel Corp | Method for continuously casting high carbon steel |
| CN102162063A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Ferritic stainless steel medium plate and manufacturing method thereof |
| KR20130049033A (en) * | 2011-11-03 | 2013-05-13 | 주식회사 포스코 | Control method for soft reduction by measuring slab form |
| CN106001476A (en) * | 2016-07-14 | 2016-10-12 | 东北大学 | Method for continuous casting billet two-stage continuous and dynamic heavy downward pressing |
| CN106925738A (en) * | 2017-04-01 | 2017-07-07 | 唐山钢铁集团有限责任公司 | The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity |
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| CN109518095A (en) * | 2019-01-03 | 2019-03-26 | 南京钢铁股份有限公司 | A kind of wide and thick slab and the production method for improving center portion segregation |
| CN110227806A (en) * | 2019-05-27 | 2019-09-13 | 北京首钢国际工程技术有限公司 | A kind of big screwdown gear of casting formula conticaster solidification end |
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