CN114381647A - Production method for preventing high-strength steel slab from being broken - Google Patents
Production method for preventing high-strength steel slab from being broken Download PDFInfo
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- CN114381647A CN114381647A CN202111472301.0A CN202111472301A CN114381647A CN 114381647 A CN114381647 A CN 114381647A CN 202111472301 A CN202111472301 A CN 202111472301A CN 114381647 A CN114381647 A CN 114381647A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000003723 Smelting Methods 0.000 claims abstract description 32
- 238000007670 refining Methods 0.000 claims abstract description 29
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 238000010583 slow cooling Methods 0.000 claims abstract description 25
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005261 decarburization Methods 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 208000010392 Bone Fractures Diseases 0.000 description 13
- 206010017076 Fracture Diseases 0.000 description 13
- 238000009749 continuous casting Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
Abstract
The invention provides a production method for preventing a high-strength steel slab from being broken, and relates to the technical field of metallurgy. The production method for preventing the high-strength steel slab from being broken comprises the following steps: carrying out converter smelting on the molten iron subjected to desulfurization treatment to obtain molten steel; carrying out LF refining and RH refining on the molten steel to obtain molten steel which can be poured into a plate blank; pouring and molding the molten steel for pouring into the plate blank to obtain a plate blank; cutting the plate blank into block-shaped plate blanks according to a preset size; performing surface machine cleaning on the cut blocky plate blanks in a hot state; warehousing the cleaned massive plate blanks for slow cooling and temperature detection; and after warehousing the massive plate blanks for slow cooling and temperature detection, sending the massive plate blanks into a hot rolling heating furnace for tapping. The production method for preventing the high-strength steel slab from being broken can reduce the occurrence of slab breakage accidents, effectively ensure the production stability, improve the production efficiency and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production method for preventing a high-strength steel slab from being broken.
Background
During the heating or rolling process of the hot rolling heating furnace, the problem that part of the continuous casting slab is broken in the heating furnace or the rolling process and the like can occur, and the problem is more obvious particularly in cold seasons. Slab breakage generally occurs in high strength steel grades with higher alloy content, such as DH980, DH1180, and the like. The slab fracture mode is usually complete fracture or partial fracture into 2 knots or more along the width in the length direction of the slab, and fracture macroscopic morphology indicates that the fracture belongs to brittle fracture. The cast structure columnar crystal of the continuous casting slab with fracture is developed, and the crystal grains of the fracture surface are generally large (after fracture defect samples are processed, holes or cracks exist at the slab defect crystal boundary, and the fracture surface is shown as hydrogen-induced perimorphic fracture). The fracture of the plate blank can cause great influence on the production stability and the product quality, and is a problem to be solved urgently in the hot rolling production.
Disclosure of Invention
The invention aims to provide a production method for preventing high-strength steel plate blanks from being broken, which can reduce the occurrence of plate blank breakage accidents, effectively ensure the production stability, improve the production efficiency and reduce the production cost.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a production method for preventing a high-strength steel slab from being broken, which comprises the following steps:
carrying out converter smelting on the molten iron subjected to desulfurization treatment to obtain molten steel;
carrying out LF refining and RH refining on the molten steel to obtain molten steel which can be poured into a plate blank;
pouring and molding the molten steel for pouring into the plate blank to obtain a plate blank;
cutting the plate blank into block-shaped plate blanks according to a preset size;
performing surface machine cleaning on the cut blocky plate blanks in a hot state;
warehousing the cleaned massive plate blanks for slow cooling and temperature detection;
and after warehousing the massive plate blanks for slow cooling and temperature detection, sending the massive plate blanks into a hot rolling heating furnace for tapping.
Further, in an optional embodiment, the step of performing converter smelting on the desulfurized molten iron to obtain molten steel includes:
performing KR desulfurization treatment on the molten iron;
and smelting the molten iron subjected to KR desulfurization treatment by using a converter to obtain the molten steel.
Further, in an optional embodiment, the step of smelting the molten iron subjected to KR desulfurization in a converter to obtain the molten steel comprises:
and carrying out dephosphorization converter smelting and decarburization converter smelting on the molten iron to obtain the molten steel.
Further, in an optional embodiment, in the step of performing LF refining and RH refining on the molten steel to obtain molten steel for casting into a slab, the hydrogen content in the molten steel is controlled to be less than 3 ppm.
Further, in an optional embodiment, in the step of casting and molding the molten steel for casting into the slab to obtain the slab, the accuracy of the roll gap arc of the casting machine is controlled within ± 0.5 mm.
Further, in an alternative embodiment, in the step of casting and molding the molten steel for casting into the slab to obtain the slab, the amplitude of the mold is ± 4mm, and the vibration frequency of the mold is 150 rpm.
Further, in an optional embodiment, in the step of obtaining the slab by casting and molding the molten steel for casting into the slab, the dip angle of the tundish submerged nozzle is 14 to 16 degrees, and the size is 65mm × 85mm to 75mm × 95 mm.
Further, in an optional embodiment, in the step of casting and molding the molten steel for casting into the slab to obtain the slab, the casting pulling speed is not lower than 1.0 m/min.
Further, in an optional embodiment, the step of warehousing the cleaned massive slab for slow cooling and warm inspection includes:
and (3) performing slow cooling on the plate-shaped plate blank which is taken off the line between hot blank stacks, or adding a heat-insulating cover on the plate-shaped plate blank for slow cooling, and controlling the temperature of the plate-shaped plate blank to be between 200 and 600 ℃.
Further, in an optional embodiment, the step of sending the massive slab into a hot rolling heating furnace for tapping after warehousing and slow cooling and temperature detection comprises:
conveying the massive plate blanks into a hot rolling heating furnace within 48 hours after warehousing, slow cooling and temperature detection;
controlling the furnace time to 210-260 min, and tapping.
The production method for preventing the high-strength steel slab from being broken provided by the invention has the following beneficial effects:
the production method for preventing the high-strength steel slab from being broken provided by the embodiment comprises the following steps: through molten iron desulphurization pretreatment, converter smelting and alloying, duplex refining process, casting into slab by a casting machine, cutting into block slabs by flame according to a certain length, warehousing the slab for slow cooling and temperature detection, and sending into a hot rolling heating furnace within 48 hours, wherein the heating furnace is controlled to be in the furnace time of 210 and 260min for steel tapping. The problem of the continuous casting slab breaking in a hot rolling heating furnace or a rolling process can be solved or improved simply and efficiently at low cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a schematic block diagram of a process of a production method for preventing a high-strength steel slab from being broken according to an embodiment of the present invention;
FIG. 2 is a block flow diagram illustrating sub-steps of step S100 of FIG. 1;
fig. 3 is a block diagram illustrating a flow of sub-steps of step S700 in fig. 1.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The embodiment provides a production method for preventing a high-strength steel slab from being broken, which can reduce slab breakage accidents, effectively ensure stable production, improve production efficiency and reduce production cost.
It should be noted that the embodiment of the present invention may improve the grain structure, so as to fully release the internal stress, thereby reducing the risk of fracture of the high strength steel slab.
Referring to fig. 1, in an embodiment of the present invention, a method for preventing a high-strength steel slab from being broken includes the following steps.
Step S100: and carrying out converter smelting on the molten iron subjected to desulfurization treatment to obtain molten steel.
Referring to fig. 2, further, in an alternative embodiment, the step S100 of performing converter smelting on the desulfurized molten iron to obtain molten steel may include the following substeps 110 and substep S120.
Substep S110: and performing KR desulfurization treatment on the molten iron.
KR desulfurization refers to mechanical agitation desulfurization, and KR is an English abbreviation of Kambara Reactor. The KR desulfurization is to immerse a baked cross-shaped stirring head which is cast with refractory material into a molten iron ladle bath for a certain depth, add a weighed desulfurizing agent onto the surface of molten iron by virtue of a vortex generated by rotation of the stirring head, and roll the weighed desulfurizing agent into the molten iron by virtue of the vortex to enable calcium oxide-based desulfurization powder to be fully contacted and reacted with the molten iron, thereby achieving the purpose of desulfurization.
Substep S120: and smelting the molten iron subjected to KR desulfurization treatment by using a converter to obtain molten steel.
It should be noted that, for the converter smelting of the molten iron, the converter smelting can be performed by using a conventional converter, and also can be performed by using a combination of the dephosphorization converter smelting and the decarburization converter smelting. The embodiments of the present invention are not specifically required or limited thereto. That is, the conventional converter smelting, the dephosphorization converter and the decarburization converter can convert molten iron into molten steel in a combined smelting manner. Compared with the conventional converter smelting, the time consumption is long, and is usually between 35min and 40 min; and the time consumption of a combined smelting mode of the dephosphorization converter and the decarburization converter is about 30 min. Compared with the conventional converter smelting mode, the combined smelting mode of the dephosphorization converter and the decarburization converter can further reduce time consumption and is beneficial to improving the production and manufacturing efficiency.
Further, the step S120 of smelting the molten iron desulfurized by KR in the converter to obtain molten steel may include the substep S121: and carrying out dephosphorization converter smelting and decarburization converter smelting on the molten iron to obtain molten steel. This substep S121 may further improve the production efficiency.
Step S200: and performing LF refining and RH refining on the molten steel to obtain molten steel which can be poured into a plate blank.
Note that, in step S200, the molten steel may be subjected to LF refining and then to RH refining. LF refining refers to a Ladle refining Furnace, and LF is Ladle Furnace, English abbreviation. The LF refining can reduce the reduction time of the electric arc furnace, finally cancel the reduction period of the electric arc furnace, is beneficial to shortening the smelting period of the electric arc furnace, improves the productivity of the electric arc furnace, and provides molten steel meeting the requirements of temperature, composition and cleanliness for continuous casting within a certain time. The RH refining refers to a vacuum cycle degassing refining furnace, which is a molten steel external refining method jointly designed and developed by Federal Germany Ruhrstahl and Heraeeus, and is named as an RH refining furnace. The RH refining adopts the technology of circulating molten steel in a vacuum tank, can be well matched with the continuous casting of a converter, and can ensure short treatment time and high efficiency. In the embodiment of the invention, the hydrogen content in the molten steel can be effectively reduced by a processing mode of LF refining and RH refining duplex process refining, so that the production safety is ensured, and the defect of cavities in the subsequent formed slab can be reduced.
Further, in step S200 of obtaining molten steel for casting into a slab by performing LF refining and RH refining on the molten steel, the hydrogen content in the molten steel may be controlled to be 3ppm (ppm, concentration unit, expressed as parts per million of solute mass in the entire solution mass, also referred to as parts per million concentration) or less.
Step S300: and (3) casting and molding the molten steel which can be cast into the slab to obtain the slab.
Further, in the step S300 of obtaining a slab by casting molten steel for casting into a slab, the accuracy of the roll gap arc of the casting machine is controlled within ± 0.5 mm.
Further, in the step S300 of casting and molding the molten steel for casting into the slab to obtain the slab, the amplitude of the mold is set to be + -4 mm, and the vibration frequency of the mold is set to be 150 rpm.
Further, in the step S300 of obtaining a slab by casting and molding molten steel that is ready to be cast into a slab, the dip angle of the tundish immersion nozzle is 14 ° to 16 °, and the size is 65mm × 85mm to 75mm × 95 mm. Optionally, the dip angle of the tundish submerged nozzle is 15 degrees, and the size is 70mm multiplied by 90 mm.
Further, in an alternative embodiment, in the step S300 of casting and molding the molten steel for casting into a slab to obtain the slab, the casting pulling rate is not lower than 1.0 m/min.
That is to say, the continuous casting slab is easily cracked under various stress effects in the solidification process, and the step S300 can be used for measuring and calibrating the roll gap and the arc joining of the casting machine before the high-strength steel is produced so as to control the roll gap and the arc joining accuracy within +/-0.5 mm for controlling the cracks generated by the continuous casting slab under the various stress effects in the solidification process. The crystallizer uses the special covering slag for high-aluminum steel in the process of pouring molten steel, the amplitude of the crystallizer is +/-4 mm, the vibration frequency is 150rpm, a tundish submerged nozzle with a 15-degree inclined angle side hole of 70mm multiplied by 90mm can be adopted, the drawing speed is controlled according to the condition that the drawing speed is not lower than 1.0m/min, and initial cracks on the surface of a slab caused by crystallizer bonding alarm are reduced or inhibited. The raw materials, auxiliary materials, alloy and casting powder used in the steel-making and continuous casting processes are ensured to be dry, and the increase of the hydrogen content in the steel is prevented.
Step S400: and cutting the plate blank into block-shaped plate blanks according to a preset size.
Step S500: and performing surface machining on the cut blocky plate blank in a hot state.
Step S600: and (5) warehousing the cleaned massive plate blanks for slow cooling and temperature detection.
Further, the step S600 of warehousing the cleaned block slabs for slow cooling and temperature detection includes: substep S610: and (3) performing slow cooling on the plate-shaped plate blank which is taken off the line between hot blank stacks, or adding a heat-insulating cover on the plate-shaped plate blank for slow cooling, and controlling the temperature of the plate-shaped plate blank to be between 200 and 600 ℃. In the sub-step S610, the hydrogen gas can be sufficiently overflowed, so as to reduce the holes in the slab, which is beneficial to preventing the slab from being broken.
Step S700: and after warehousing the blocky plate blank for slow cooling and temperature detection, sending the blocky plate blank into a hot rolling heating furnace for tapping.
Referring to fig. 3, step S700 of feeding the slab into the hot rolling furnace for tapping after the slab is stored in the storage for slow cooling and temperature testing includes substep S710: sending the massive plate blanks into a hot rolling heating furnace within 48 hours after warehousing, slow cooling and temperature detection; and, substep S720: controlling the furnace time to 210-260 min, and tapping.
The production method for preventing the high-strength steel slab from being broken provided by the embodiment comprises the following steps: through molten iron desulphurization pretreatment, converter smelting and alloying, duplex refining process, casting into slab by a casting machine, cutting into block slabs by flame according to a certain length, warehousing the slab for slow cooling and temperature detection, and sending into a hot rolling heating furnace within 48 hours, wherein the heating furnace is controlled to be in the furnace time of 210 and 260min for steel tapping. The problem of the continuous casting slab breaking in a hot rolling heating furnace or a rolling process can be solved or improved simply and efficiently at low cost.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A production method for preventing a high-strength steel slab from being broken is characterized by comprising the following steps:
carrying out converter smelting on the molten iron subjected to desulfurization treatment to obtain molten steel;
carrying out LF refining and RH refining on the molten steel to obtain molten steel which can be poured into a plate blank;
pouring and molding the molten steel for pouring into the plate blank to obtain a plate blank;
cutting the plate blank into block-shaped plate blanks according to a preset size;
performing surface machine cleaning on the cut blocky plate blanks in a hot state;
warehousing the cleaned massive plate blanks for slow cooling and temperature detection;
and after warehousing the massive plate blanks for slow cooling and temperature detection, sending the massive plate blanks into a hot rolling heating furnace for tapping.
2. The production method for preventing the high-strength steel slab from being broken according to claim 1, wherein the step of performing converter smelting on the molten iron after desulfurization treatment to obtain the molten steel comprises the following steps:
performing KR desulfurization treatment on the molten iron;
and smelting the molten iron subjected to KR desulfurization treatment by using a converter to obtain the molten steel.
3. The method for preventing high-strength steel slab from being broken according to claim 2, wherein the step of smelting the molten iron subjected to KR desulfurization in a converter to obtain the molten steel comprises the following steps:
and carrying out dephosphorization converter smelting and decarburization converter smelting on the molten iron to obtain the molten steel.
4. The method according to claim 1, wherein the hydrogen content in the molten steel is controlled to be 3ppm or less in the step of subjecting the molten steel to LF refining and RH refining to obtain molten steel ready for casting into a slab.
5. The production method for preventing the high-strength steel slab from being broken according to claim 1, wherein in the step of casting and molding the molten steel for casting into the slab to obtain the slab, the accuracy of the roll gap arc of the casting machine is controlled within ± 0.5 mm.
6. The production method for preventing high-strength steel slab breakage according to claim 1, wherein in the step of casting and molding the molten steel for casting into the slab to obtain the slab, the amplitude of the mold is ± 4mm, and the vibration frequency of the mold is 150 rpm.
7. The production method for preventing high-strength steel slab breakage according to claim 6, wherein in the step of obtaining a slab by casting the molten steel for casting into a slab, the tundish submerged nozzle has an inclination angle of 14 ° to 16 ° and a size of 65mm x 85mm to 75mm x 95 mm.
8. The production method for preventing high-strength steel slab breakage according to claim 6 or 7, characterized in that in the step of casting the molten steel for casting into a slab to obtain the slab, the casting pulling rate is not less than 1.0 m/min.
9. The production method for preventing the high-strength steel slab from being broken according to claim 1, wherein the step of warehousing, slow cooling and temperature detection of the block slabs after being mechanically cleaned comprises the following steps of:
and (3) performing slow cooling on the plate-shaped plate blank which is taken off the line between hot blank stacks, or adding a heat-insulating cover on the plate-shaped plate blank for slow cooling, and controlling the temperature of the plate-shaped plate blank to be between 200 and 600 ℃.
10. The production method for preventing the high-strength steel slab from being broken according to claim 1, wherein the step of feeding the massive slab into a hot rolling heating furnace for tapping after warehousing and slow cooling and temperature detection comprises the following steps of:
conveying the massive plate blanks into a hot rolling heating furnace within 48 hours after warehousing, slow cooling and temperature detection;
controlling the furnace time to 210-260 min, and tapping.
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| CN202111472301.0A CN114381647A (en) | 2021-12-04 | 2021-12-04 | Production method for preventing high-strength steel slab from being broken |
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| CN202111472301.0A CN114381647A (en) | 2021-12-04 | 2021-12-04 | Production method for preventing high-strength steel slab from being broken |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013112855A (en) * | 2011-11-29 | 2013-06-10 | Jfe Steel Corp | Method for smelting low-carbon high-manganese steel |
| CN106834947A (en) * | 2017-02-27 | 2017-06-13 | 钢铁研究总院 | A kind of C grades of angle steel continuous casting process of big aligning strain |
| CN111482566A (en) * | 2020-03-23 | 2020-08-04 | 首钢集团有限公司 | Continuous casting method of aluminum-containing peritectic high-strength automobile steel |
-
2021
- 2021-12-04 CN CN202111472301.0A patent/CN114381647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013112855A (en) * | 2011-11-29 | 2013-06-10 | Jfe Steel Corp | Method for smelting low-carbon high-manganese steel |
| CN106834947A (en) * | 2017-02-27 | 2017-06-13 | 钢铁研究总院 | A kind of C grades of angle steel continuous casting process of big aligning strain |
| CN111482566A (en) * | 2020-03-23 | 2020-08-04 | 首钢集团有限公司 | Continuous casting method of aluminum-containing peritectic high-strength automobile steel |
Non-Patent Citations (1)
| Title |
|---|
| 李向奎等: "高强钢连铸板坯断坯原因分析及预防", 《冶金与材料》 * |
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Application publication date: 20220422 |