CN114101605B - Method for improving low-power quality of continuous casting blank for wide and thick plate - Google Patents
Method for improving low-power quality of continuous casting blank for wide and thick plate Download PDFInfo
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005266 casting Methods 0.000 claims abstract description 50
- 230000009467 reduction Effects 0.000 claims abstract description 33
- 238000007711 solidification Methods 0.000 claims abstract description 23
- 230000008023 solidification Effects 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000750 progressive effect Effects 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 239000007790 solid phase Substances 0.000 claims description 5
- 238000005204 segregation Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 230000000881 depressing effect Effects 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
-
- 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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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention relates to a method for improving the low-power quality of a continuous casting blank for a wide and thick plate, belonging to the technical field of steelmaking. The method comprises the following steps: (1) Adding a proper amount of Nb into 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 specific water quantity according to the component range and the pulling speed; (3) The solidification end dynamic progressive depressing process is adopted for depressing treatment. In the invention, a trace amount of Nb is added in the composition to replace part of Mn, so that the content of easily segregated elements is reduced from the source. And pouring with low superheat degree, and optimizing secondary cooling and drawing speed parameters to promote equiaxed crystallization of a solidification structure. By adopting the technologies of dynamic increasing the reduction rate of the solidification tail end and the like, the solidification shrinkage of the tail end of the casting blank is compensated 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 has obvious effects of improving the center segregation and the loosening of the casting blank.
Description
Technical Field
The invention relates to the technical field of steelmaking, 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 blank is a basic raw material of steel, the quality of the continuous casting blank directly influences the process and physical properties of the product, and the quality of the continuous casting blank is low, including center segregation, center porosity, middle cracks and the like, and is an effective way for evaluating the quality of the continuous casting blank. For continuous casting billets for medium plates, center segregation and center porosity defects become more and more main factors affecting the quality of steel, affect the uniformity of steel tissues, reduce steel plate shaping and low-temperature impact toughness indexes, and particularly the lamellar tearing resistance of the steel plate in the thickness direction, and have adverse effects on the processing and use of the steel.
Patent application CN1062925738A 'improves the homogeneity of a low-alloy high-strength structural steel wide-thick plate continuous casting blank', discloses that the central segregation of the low-alloy high-strength structural steel wide-thick plate continuous casting blank is reduced by comprehensively utilizing technical measures such as stable casting machine stretching, tundish superheat degree reduction, secondary cooling dynamic control, solidification end heavy reduction control and the like, and improves the homogeneity of the continuous casting blank. However, in the control process, the combination of heavy pressing and light pressing is required, the position for starting heavy pressing is required to be accurately judged, the control is complex, the positions of light pressing and heavy pressing cannot be smoothly transited, and the defects of bulging and the like are easily caused.
Patent application CN107081413A 'method for improving center density of steel continuous casting blank for high-rise building', discloses that center porosity of Gao Jiangang casting blank is reduced by stabilizing casting machine pull speed, reducing tundish superheat degree, dynamic control of secondary cooling and control technical measures of heavy reduction of solidification tail end, and further center density of casting blank is improved, and internal quality of rolled material is improved. The method has a certain improvement effect on the center of the Gao Jian steel casting blank, but needs to combine light pressing and heavy pressing, needs to accurately judge the position for starting heavy pressing, has complex control, and can not smoothly transition the positions of the light pressing and the heavy pressing, thereby easily causing the defects of bulging and the like.
Disclosure of Invention
Aiming at solving the problems that the control method is complex and the bulging and other defects are easy to occur when the low-power quality of the continuous casting blank is ensured in the prior art, the invention provides a method for improving the low-power quality of the continuous casting blank for wide and thick plates, so as to solve the technical problems. According to the invention, trace Nb is added from the aspect of component design to replace part of Mn, so that the content of easily segregated elements is reduced from the source. And pouring with low superheat degree, and optimizing secondary cooling and drawing speed parameters to promote equiaxed crystallization of a solidification structure. By adopting technologies such as dynamic increasing reduction rate of the solidification tail end and the like, the solidification 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 center segregation and center porosity of the casting blank are achieved, and the method has a good effect on improving the processing and formability of wide and thick plates.
The technical scheme of the invention is as follows:
a method for improving the low-power quality of a continuous casting blank for a wide and thick plate comprises the following steps:
(1) And (3) component design: adding a proper amount of Nb into molten steel, reducing the addition amount of Mn, and reducing the segregation tendency of the molten steel in the solidification process from the source;
(2) In the continuous casting process, the casting 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 pulling speed through a secondary cooling water distribution model;
(3) The solidification end dynamic progressive depressing process is adopted for depressing treatment.
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 to 30 ℃.
Preferably, in the step (2), the specific water content of the secondary cooling is 0.10-0.15L/kg.
Preferably, in the step (3), the pressing process is as follows: soft reduction is adopted from the center solid phase rate of the casting blank to 0.6, the initial reduction rate is 1.0-1.5 mm/m, and the dynamic incremental reduction rate is carried out at the rate increment of 0.03-0.05 mm/m until the solidification end is reached.
Preferably, after casting, the cross section of the continuous casting blank is processed by a milling machine according to the GBT226-2015 requirement, and then is corroded by cold etching liquid, and the low-power quality rating is carried out according to YBT 4003-2016.
Preferably, the cross-sectional dimension of the continuous casting billet is 300mm×1800mm to 2200mm.
The beneficial effects of the invention are as follows:
according to the invention, trace Nb is added from the aspect of component design to replace part of Mn, so that the content of easily segregated elements is reduced from the source; and pouring with low superheat degree, and optimizing secondary cooling and drawing speed parameters to promote equiaxed crystallization of a solidification structure. By adopting the technologies of dynamic increasing the reduction rate of the solidification tail end and the like, the solidification shrinkage of the tail end of the casting blank is compensated 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 has obvious effects of improving the center segregation and the loosening of the casting blank.
Detailed Description
In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
A method for improving the quality of continuous casting blanks for wide and thick plates is characterized in that Q355ND continuous casting blanks with the cross section dimension of 300mm multiplied by 2000mm are used; the method comprises the following steps:
(1) The components of the control molten steel are as follows: 0.16% of C, 0.15% of Si, 0.010% of Nb, 0.98% of Mn, 0.010% of Ti, 0.018% of P, 0.010% of S and the balance of Fe,
(2) In the continuous casting process, the pulling speed of a casting machine is controlled to be 0.85m/min, the casting speed is kept stable and unchanged, and the superheat degree of the molten steel in the tundish is 15 ℃; the specific water quantity of secondary cooling in the secondary cooling water distribution model is 0.10L/kg;
(3) Dynamically increasing the rolling reduction by adopting a solidification tail end; starting to conduct reduction 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 0.03mm/m, starting to conduct reduction from 6 sections, increasing the reduction rate to 1.49mm/m through 16.47min, and ending to the solidification end, wherein the total reduction is 20.5 mm;
(4) After casting, taking the cross section of the continuous casting blank according to the GBT226-2015 requirement, processing the cross section by a milling machine, corroding the cross section by using cold etching liquid, and grading the cross section by low-power quality according to YBT 4003-2016; the test result shows that the center segregation of the casting blank is C class 1.0, and the casting blank has no center porosity.
Example 2
A method for improving the quality of continuous casting blanks for wide and thick plates is characterized in that Q355ND continuous casting blanks with the section size of 300mm multiplied by 1820mm are used for continuous casting blanks; the method comprises the following steps:
(1) The components of the control molten steel are as follows: 0.16% of C, 0.20% of Si, 0.013% of Nb, 1.05% of Mn, 0.018% of Ti, 0.018% of P, 0.010% of S and the balance of Fe,
(2) In the continuous casting process, the pulling speed of a casting machine is controlled to be 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 quantity of secondary cooling in the secondary cooling water distribution model is 0.12L/kg;
(3) Dynamically increasing the rolling reduction by adopting a solidification tail end; starting to conduct reduction 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 0.04mm/m, starting to conduct reduction from 6 sections, increasing the reduction rate to 1.822mm/m through 15.55min, and ending to the solidification end, wherein the total reduction rate is 23.496 mm;
(4) After casting, taking the cross section of the continuous casting blank according to the GBT226-2015 requirement, processing the cross section by a milling machine, corroding the cross section by using cold etching liquid, and grading the cross section by low-power quality according to YBT 4003-2016; the test result shows that the center segregation of the casting blank is C class 1.0, and the casting blank has no center porosity.
Example 3
A method for improving the quality of continuous casting blanks for wide and thick plates is characterized in that Q355ND continuous casting blanks with the cross section dimensions of 300mm multiplied by 2100mm are used; the method comprises the following steps:
(1) The components of the control molten steel are as follows: 0.16% of C, 0.25% of Si, 0.015% of Nb, 1.15% of Mn, 0.020% of Ti, 0.018% of P, 0.010% of S and the balance of Fe,
(2) In the continuous casting process, the pulling speed of a casting machine is controlled to be 1.0m/min, the casting speed is kept stable and unchanged, and the superheat degree of molten steel in a tundish is 30 ℃; the specific water quantity of secondary cooling in the secondary cooling water distribution model is 0.15L/kg;
(3) Dynamically increasing the rolling reduction by adopting a solidification tail end; starting to conduct reduction 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 0.05mm/m, starting to conduct reduction from 6 sections, increasing the reduction rate to 2.2mm/m after 14min, and ending to the solidification end, wherein the total reduction rate is 25.9 mm;
(4) After casting, taking the cross section of the continuous casting blank according to the GBT226-2015 requirement, processing the cross section by a milling machine, corroding the cross section by using cold etching liquid, and grading the cross section by low-power quality according to YBT 4003-2016; the test result shows that the center segregation of the casting blank is C class 1.0, and the casting blank has no center porosity.
Comparative example
A method for improving the quality of continuous casting blanks for wide and thick plates is characterized in that Q355ND continuous casting blanks with the cross section dimensions of 300mm multiplied by 2100mm are used; the method comprises the following steps:
(1) The components of the control molten steel are 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 pulling speed of a casting machine is controlled to be 1.2m/min, the casting speed is kept stable and unchanged, and the superheat degree of the molten steel in the tundish is 20 ℃; the specific water quantity of secondary cooling in the secondary cooling water distribution model is 0.10L/kg;
(3) Dynamic pressing is not adopted;
(4) After casting, taking the cross section of the continuous casting blank according to the GBT226-2015 requirement, processing the cross section by a milling machine, corroding the cross section by using cold etching liquid, and grading the cross section by low-power quality according to YBT 4003-2016; the test result shows that the center segregation of the casting blank is 2.0 of C class, 0.5 of center looseness and 0.5 of middle crack.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A method for improving the quality of a continuous casting slab for a wide and thick slab, comprising the steps of:
(1) The mass percentage of the designed molten steel components is as follows: 0.14-0.20% of C, 0.15-0.30% of Si, 0.010-0.015% of Nb, 0.95-1.15% of Mn, 0.010-0.015% of Ti, less than or equal to 0.025% of P, less than or equal to 0.015% of S and the balance of Fe;
(2) In the continuous casting process, controlling the casting speed and the superheat degree of a casting machine, and selecting the matched secondary cooling specific water quantity;
(3) Adopting a solidification tail end dynamic progressive pressing process to perform pressing treatment; the pressing process comprises the following steps: and (3) adopting soft reduction from the center solid phase rate of the casting blank to be 0.6, 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 is reached.
2. The method for improving the quality of a continuous casting slab for a wide and thick plate according to claim 1, wherein in the step (2), the casting speed is 0.85 to 1.0m/min.
3. The method for improving the quality of a continuous casting slab for a wide and thick slab according to claim 1, wherein the degree of superheat in the step (2) is 15 to 30 ℃.
4. The method for improving the quality of a continuous casting slab for a wide and thick slab according to claim 1, wherein the specific water amount of the secondary cooling in the step (2) is 0.10 to 0.15l/kg.
5. The method for improving the low-power quality of the continuous casting blank for the wide and thick plates according to claim 1, wherein after casting, the cross section of the continuous casting blank is processed by a milling machine according to the GBT226-2015 requirement, and then is corroded by cold etching liquid, and the low-power quality is rated according to YBT 4003-2016.
6. The method for improving the quality of a continuous casting slab for a wide and thick plate according to claim 1, wherein the cross-sectional dimension of the continuous casting slab is 300mm x 180mm to 2200mm.
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| JP5402308B2 (en) * | 2009-06-26 | 2014-01-29 | Ｊｆｅスチール株式会社 | Continuous casting method of high carbon steel |
| CN102162063B (en) * | 2010-02-23 | 2012-11-14 | 宝山钢铁股份有限公司 | Ferritic stainless steel medium plate and manufacturing method thereof |
| KR101316756B1 (en) * | 2011-11-03 | 2013-10-10 | 주식회사 포스코 | Control method for Centerline Segregation by measuring slab form |
| CN106001476B (en) * | 2016-07-14 | 2017-10-31 | 东北大学 | A kind of method under the continuous dynamic weight of continuous casting billet two benches |
| CN106925738B (en) * | 2017-04-01 | 2019-11-22 | 唐山钢铁集团有限责任公司 | Method for Improving Homogeneity of Low Alloy High Strength Structural Steel Wide and Thick Slab Continuous Casting Slabs |
| CN107081413B (en) * | 2017-04-01 | 2019-08-09 | 唐山钢铁集团有限责任公司 | Method for Improving Center Density of Steel Continuous Casting Slabs Used in High-rise Buildings |
| 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 |
| CN110227806B (en) * | 2019-05-27 | 2024-05-14 | 北京首钢国际工程技术有限公司 | Device for greatly pressing solidification tail end of casting-rolling type continuous casting machine |
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