CN116944442A - Production process for controlling internal cracking of small square billet HPB300 steel - Google Patents
Production process for controlling internal cracking of small square billet HPB300 steel Download PDFInfo
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- CN116944442A CN116944442A CN202311148851.6A CN202311148851A CN116944442A CN 116944442 A CN116944442 A CN 116944442A CN 202311148851 A CN202311148851 A CN 202311148851A CN 116944442 A CN116944442 A CN 116944442A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000005336 cracking Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000000498 cooling water Substances 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 46
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 6
- 229910052785 arsenic Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims 1
- 238000009749 continuous casting Methods 0.000 abstract description 13
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000843 powder Substances 0.000 description 8
- 239000010949 copper Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- 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
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
-
- 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
Abstract
The invention discloses a production process for controlling internal cracking of small square billet HPB300 steel, and belongs to the technical field of metallurgy. The method comprises the following steps: the liquid molten steel enters a crystallizer to form a solidified blank shell, the solidified blank shell leaves the crystallizer under the action of a withdrawal and straightening machine, the liquid molten steel is cooled by spraying water in a secondary cooling chamber, and is gradually solidified into small square billets, wherein the withdrawal speed of the small square billets is controlled to be 2.1-2.3m/min, the addition speed of protective slag in the crystallizer is 75-85g/min, and the cooling water flow of the crystallizer is 141-143m 3 And/h, the total cooling water flow of the secondary cooling zone is 35.1-36.1m 3 And/h, dividing the secondary cooling zone into 4 cooling zones and controlling each zoneWater flow. The invention adopts a proper continuous casting process to control the HPB300 steel 170 2 The pulling speed of the small square billet and the cooling process can be matched, so that the internal cracking proportion of the small square billet can be stably controlled within 1 percent.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production process for controlling internal cracking of small square billet HPB300 steel.
Background
The HPB is called hot-rolled plain round bar simply as round bar, the HPB300 hot-rolled plain round bar has the advantages of high strength, good comprehensive performance and the like, and at present, the production process of the hot-rolled plain round bar HPB300 is mainly finished through iron making, steel making, continuous casting, rolling, cold control, coil collecting and packing, but due to improper process control, the produced casting blank has more internal defects, so that the quality of the steel is greatly influenced.
In view of this, the present invention has been proposed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a production process for controlling the internal cracking of small square billet HPB300 steel.
The invention solves the technical problems by adopting the following technical scheme.
The embodiment of the invention provides a production process for controlling internal cracking of small square billet HPB300 steel, which comprises the following steps: the liquid molten steel enters a crystallizer to form a solidified blank shell, the solidified blank shell leaves the crystallizer under the action of a withdrawal and straightening machine, the liquid molten steel is cooled by spraying water in a secondary cooling chamber, and is gradually solidified into small square billets, wherein the withdrawal speed of the small square billets is controlled to be 2.1-2.3m/min, the addition speed of protective slag in the crystallizer is 75-85g/min, and the cooling water flow of the crystallizer is 141-143m 3 /h。
The invention has the following beneficial effects:
the invention providesThe production process for controlling the internal cracking of the small square billet HPB300 steel comprises the following steps: the liquid molten steel enters a crystallizer to form a solidified blank shell, the solidified blank shell leaves the crystallizer under the action of a withdrawal and straightening machine, the liquid molten steel is cooled by spraying water in a secondary cooling chamber, and is gradually solidified into small square billets, wherein the withdrawal speed of the small square billets is controlled to be 2.1-2.3m/min, the addition speed of protective slag in the crystallizer is 75-85g/min, and the cooling water flow of the crystallizer is 141-143m 3 And/h. Because the internal cracking of the small square billet HPB300 steel is mainly determined by factors such as continuous casting drawing speed, cooling process and the like, in order to eliminate shrinkage cavity of the small square billet HPB300 steel, the cooling process such as continuous casting drawing speed, cooling water quantity of a crystallizer, casting powder adding speed and the like are required to be reasonably controlled, the cooling speed of the small square billet is reduced, and the internal cracking proportion of the small square billet HPB300 steel is obviously reduced by adopting the method provided by the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a photograph showing the appearance of a cast slab obtained in the example;
fig. 2 is a photograph showing the appearance of a cast slab obtained in the comparative example.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The following specifically describes a production process for controlling the internal cracking of the billet HPB300 steel provided by the embodiment of the invention.
The embodiment of the invention provides a production process for controlling the internal cracking of small square billet HPB300 steel,the method comprises the following steps: the liquid molten steel enters a crystallizer to form a solidified blank shell, the solidified blank shell leaves the crystallizer under the action of a withdrawal and straightening machine, the liquid molten steel is cooled by spraying water in a secondary cooling chamber, and is gradually solidified into small square billets, wherein the withdrawal speed of the small square billets is controlled to be 2.1-2.3m/min, the addition speed of protective slag in the crystallizer is 75-85g/min, and the cooling water flow of the crystallizer is 141-143m 3 /h。
Internal cracks are cracks generated by various stresses (thermal stress, mechanical stress, etc.) acting on a weak solidification interface during casting, and are generally considered to occur before solidification and are mostly accompanied by segregation, so that the internal cracks are also called segregation cracks, and the following 3 factors affect the formation of internal cracks are mainly included: chemical composition, process conditions and equipment. The scheme provided by the embodiment of the invention mainly controls the formation of the internal crack of the billet HPB300 steel from two aspects of chemical components and process conditions. The inventor has found through long-term practice that: the internal cracking of the small square billet HPB300 steel is mainly determined by factors such as continuous casting drawing speed, cooling process and the like, and in order to eliminate shrinkage cavity of the small square billet HPB300 steel, the cooling process such as continuous casting drawing speed, cooling water quantity of a crystallizer, casting powder adding speed and the like needs to be reasonably controlled, so that the cooling speed of the small square billet is reduced. Therefore, the production process for controlling the internal cracking of the small square billet HPB300 steel, which is provided by the embodiment of the invention, is mainly used for obviously reducing the internal cracking proportion of the small square billet through the combination of the pulling speed and the cooling process.
In an alternative embodiment, the billet has a cross section of 150-200mm by 150-200mm.
In an alternative embodiment, the billet has a cross section of 170mm by 170mm.
In an alternative embodiment, the HPB300 steel comprises the following components in mass percent: 0.2 to 0.24 percent of C, 0.16 to 0.3 percent of Si, 0.66 to 0.8 percent of Mn, 0 to 0.045 percent of P, 0 to 0.04 percent of S, 0 to 0.3 percent of Cu, 0 to 0.2 percent of As, and the balance of Fe and unavoidable impurities.
In an alternative embodiment, for the 1 st heat of ladle casting, the superheat degree of the cast liquid molten steel is controlled to be 30-40 ℃; and controlling the superheat degree of the poured liquid molten steel at 20-30 ℃ for the 2 nd-N heats of tundish casting.
In an alternative embodiment, the total salt content of the cooling water used in the crystallizer is less than or equal to 500mg/l, and the turbidity is less than or equal to 10 and ntu.
In an alternative embodiment, the total cooling water flow of the secondary cooling zone is 35.1-36.1m 3 /h。
In an alternative embodiment, the two cooling zones are divided into 4 cooling zones, and the water flow rate of each zone is as follows: one region 11.7-12.1m 3 /h, two zones 12.0-12.2m 3 /h, three-zone 7.1-7.3m 3 /h, four zones 4.3-4.5m 3 /h。
In an alternative embodiment, the total salt content of the cooling water used in the secondary cooling zone is less than or equal to 1000mg/l and the turbidity is less than or equal to 20 and ntu.
In an alternative embodiment, the internal cracks of the produced billet HPB300 steel are detected, and the internal crack ratio is within 1%.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
The embodiment of the invention provides a 170 2 The preparation process of the small square billet comprises the following specific steps:
at 170 2 The small square billet steel grade HPB300 is taken as an example, and comprises the following components in percentage by weight: 0.2 to 0.24 percent of C, 0.16 to 0.3 percent of Si, 0.66 to 0.8 percent of Mn, 0 to 0.045 percent of P, 0 to 0.04 percent of S, 0 to 0.3 percent of Cu, 0 to 0.2 percent of As, and the balance of Fe and unavoidable impurities.
The pulling speed is controlled according to 2.1-2.3 m/min.
Cooling water flow of crystallizer is according to 141-143m 3 And (3) controlling the total salt content of the cooling water quality to be less than or equal to 500mg/l, and turbidity to be less than or equal to 10 and ntu.
The second cooling zone is divided into four zones, namely a first zone, a second zone, a third zone and a fourth zone. The flow rate of the cooling water in one area is 11.7-12.1m 3 And/h, the flow rate of the cooling water in the second area is 12.0-12.2m 3 And/h, the flow rate of the three-zone cooling water is 7.1-7.3m 3 And/h, the flow rate of the four-zone cooling water is 4.3-4.5m 3 And/h, the total cooling water flow is 35.1-36.1m 3 And/h. The total salt content of the cooling water is less than or equal to 1000mg/l, and the turbidity is less than or equal to 20 and ntu.
And after continuous casting is finished, detecting the internal cracking condition of the section of the cooled billet.
Table 1 below is 170 2 Small square billet steel grade HMain production process parameters of PB 300.
TABLE 1
Table 2 below is 170 2 The internal cracking ratio of the small square billet steel grade HPB 300.
TABLE 2
From the experimental results of table 2 above, it can be seen that: in the embodiment of the invention, a proper continuous casting process is adopted to control the HPB300 steel 170 2 The pulling speed of the small square billet and the matching of the cooling process can lead 170 to 2 The internal cracking proportion of the small square billet HPB300 steel grade is stably controlled within 1 percent. The appearance photo of the obtained product is shown in figure 1, and the product has good surface quality, is smooth and has no crack defect. In the comparative example, the mold flux addition speed, the pulling speed of the small square billet, the water flow of the crystallizer, the cooling parameters and the like in the continuous casting process are changed, when the steel billet is discharged from the crystallizer, the internal angle cracks are easily diffused to the surface of the casting blank to form pits, and the appearance photo of the obtained product is shown in fig. 2, so that the surface quality is seriously influenced, and the performance and the price of the casting blank are reduced. Specific:
comparative example 1
Similar to the procedure of example 1, the only difference is that: the addition speed of the covering slag is 72g/min, and the result is 10-15%. When the adding speed of the casting powder is smaller, the melting speed of the casting powder cannot keep up with the drawing speed of the casting blank, so that gaps are formed between the surface of the casting blank and a copper pipe of a crystallizer, the cooling effect of the casting blank center is poor, and the casting blank center is cooled too fast to form internal cracks under the quenching condition when entering a secondary cooling chamber.
Comparative example 2
Similar to the procedure of example 1, the only difference is that: the addition rate of the mold flux was 87g/min, and the result was 18-22%. When the adding speed of the casting powder is too high, the casting powder cannot be melted in time, so that the lubricating effect between the surface of the casting blank and the crystallizer is poor, the central cooling effect of the casting blank is poor, and the central cooling of the casting blank is too fast under the quenching condition when the casting blank enters the secondary cooling chamber, so that internal cracks are formed.
Comparative example 3
Similar to the procedure of example 1, the only difference is that: the casting blank drawing speed is 2.5m/min, and the result is 11-16%. When the casting blank drawing speed is too high, the molten casting powder cannot be filled into the gap between the blank shell and the copper pipe of the crystallizer in time, so that the central cooling effect of the casting blank is poor, and the central cooling of the casting blank is too fast under the quenching condition when the casting blank enters a secondary cooling chamber, so that internal cracks are formed.
Comparative example 4
Similar to the procedure of example 1, the only difference is that: the casting blank drawing speed is 1.8m/min, and the result is 17-21%. When the casting blank pulling speed is smaller, the casting powder cannot be melted in time, so that the lubrication effect between the surface of the casting blank and the crystallizer is poor, the cooling effect of the center of the casting blank is poor, and the center of the casting blank is cooled too fast under the quenching condition when entering a secondary cooling chamber to form internal cracks.
Comparative example 5
Similar to the procedure of example 1, the only difference is that: the water flow of the crystallizer is 150m 3 And/h, the result is 25-33%. When the water flow of the crystallizer is larger, the cooling strength of the casting blank in the copper pipe of the crystallizer is larger, and after the surface of the casting blank is rapidly cooled, the molten steel in the center of the casting blank forms internal cracking after subsequent solidification.
Comparative example 6
Similar to the procedure of example 1, the only difference is that: the water flow of the crystallizer is 130m 3 And/h, the result is 23-32%. When the water flow of the crystallizer is smaller, the cooling strength of the casting blank in the copper pipe of the crystallizer is smaller, the cooling speed of the casting blank is slower, and the molten steel in the center of the casting blank forms internal cracking after being quenched in the two cooling chambers.
Comparative example 7
And implementationThe procedure of example 1 is similar, except that: the water flow rate of the secondary cooling area is 38.77m 3 And/h, the result is 33-36%. When the water flow rate of the secondary cooling area is larger, the cooling strength of the casting blank in the secondary cooling area is larger, the cooling speed of the casting blank is higher, and internal cracks are formed after the molten steel in the center of the casting blank is solidified.
Comparative example 8
Similar to the procedure of example 1, the only difference is that: the water flow rate of the secondary cooling area is 32.32m 3 And/h, the result is 30-35%. When the water flow rate of the secondary cooling area is smaller, the cooling strength of the casting blank in the secondary cooling area is smaller, molten steel in the center of the casting blank cannot be solidified in time, and internal cracks are formed after the casting blank is cooled and solidified.
The above can be seen: the embodiment of the invention provides a control method for controlling the internal cracking of small square billet HPB300 steel, which is characterized by continuous casting 170 2 The internal cracking defect of the small square billet is determined by factors such as the adding speed of the mold covering slag, the continuous casting pulling speed, the cooling water quantity of the mold, the cooling water quantity of the secondary cooling zone and the like, and in order to eliminate the internal cracking defect of the small square billet, the inventor reasonably configures the adding speed of the mold covering slag, the pulling speed of the small square billet, the cooling water quantity of the mold, the cooling water quantity of the secondary cooling zone and the like through long-term practice, improves the continuous casting process of the small square billet, and finally controls the internal cracking ratio of HPB300 steel of the small square billet to be within 1 percent, thereby obviously improving the internal quality of products and ensuring good quality of the small square billet obtained through continuous casting.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A production process for controlling internal cracking of small square billet HPB300 steel, which is characterized by comprising the following steps: the liquid molten steel enters a crystallizer to form a solidified blank shell, the solidified blank shell leaves the crystallizer under the action of a withdrawal and straightening machine, the liquid molten steel is gradually solidified into small square billets through water spray cooling in a secondary cooling chamber, wherein the withdrawal speed of the small square billets is controlled to be 2.1-2.3m/min, and the addition speed of covering slag in the crystallizer is 75 percent-85g/min, the cooling water flow of the crystallizer is 141-143m 3 /h。
2. The process according to claim 1, wherein the billet has a cross section of 150-200mm x 150-200mm.
3. The production process according to claim 2, wherein the billet has a cross section of 170mm x 170mm.
4. The production process according to claim 1, wherein the HPB300 steel comprises the following components in mass percent: 0.2 to 0.24 percent of C, 0.16 to 0.3 percent of Si, 0.66 to 0.8 percent of Mn, 0 to 0.045 percent of P, 0 to 0.04 percent of S, 0 to 0.3 percent of Cu, 0 to 0.2 percent of As, and the balance of Fe and unavoidable impurities.
5. The production process according to claim 1, wherein the superheat degree of the poured liquid molten steel is controlled to be 30-40 ℃ for the 1 st heat of tundish casting; and controlling the superheat degree of the poured liquid molten steel at 20-30 ℃ for the 2 nd-N heats of tundish casting.
6. The process according to claim 1, wherein the total salt content of the cooling water used in the crystallizer is less than or equal to 500mg/l, and the turbidity is less than or equal to 10ntu.
7. The process according to claim 1, wherein the total cooling water flow of the secondary cooling zone is from 35.1 to 36.1m 3 /h。
8. The process of claim 7 wherein the two cooling zones are divided into 4 cooling zones, each zone having a water flow rate of: one region 11.7-12.1m 3 /h, two zones 12.0-12.2m 3 /h, three-zone 7.1-7.3m 3 /h, four zones 4.3-4.5m 3 /h。
9. The process of claim 8, wherein the total salt content of the cooling water used in the secondary cooling zone is less than or equal to 1000mg/l, and the turbidity is less than or equal to 20 and ntu.
10. The production process according to claim 1, wherein the internal cracks of the produced billet HPB300 steel are detected, and the internal crack ratio is within 1%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311148851.6A CN116944442A (en) | 2023-09-06 | 2023-09-06 | Production process for controlling internal cracking of small square billet HPB300 steel |
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| CN202311148851.6A CN116944442A (en) | 2023-09-06 | 2023-09-06 | Production process for controlling internal cracking of small square billet HPB300 steel |
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- 2023-09-06 CN CN202311148851.6A patent/CN116944442A/en active Pending
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