CN117127119A - Mould steel billet and continuous casting method thereof - Google Patents
Mould steel billet and continuous casting method thereof Download PDFInfo
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- CN117127119A CN117127119A CN202311378585.6A CN202311378585A CN117127119A CN 117127119 A CN117127119 A CN 117127119A CN 202311378585 A CN202311378585 A CN 202311378585A CN 117127119 A CN117127119 A CN 117127119A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 238000009749 continuous casting Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 239000011651 chromium Substances 0.000 claims abstract description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 239000011733 molybdenum Substances 0.000 claims abstract description 9
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 9
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000000443 aerosol Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 3
- 230000007547 defect Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000000641 cold extrusion Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- 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
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a die steel billet and a continuous casting method thereof, belonging to the technical field of metallurgy. The casting method comprises the following steps: smelting raw materials into molten steel, continuously casting the molten steel into a blank, and then annealing to obtain a die steel blank; wherein the molten steel comprises the following components in percentage by weight: 1.5-1.90% of carbon, less than or equal to 0.60% of manganese, less than or equal to 0.6% of silicon, 10-13% of chromium, 0.2-0.7% of molybdenum, 0.15-0.25% of vanadium, 30-100 ppm of rhenium and the balance of iron and impurities; in the continuous casting process, the water quantity of the crystallizer is more than or equal to 110L/min, the water pressure is more than or equal to 0.6Mpa, and the water inlet and outlet temperature difference is less than or equal to 12 ℃. The invention adopts the molten steel components and is matched with reasonable continuous casting process parameter settings, so that the surface of the obtained steel billet has no problems of point leakage, cracks and the like, the internal quality of the continuous casting billet meets the requirements, the quality defect is avoided, and the production quality of the obtained steel billet is improved.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a die steel billet and a continuous casting method thereof.
Background
Cold work die steel uses include cold stamping dies, cold extrusion dies, cold heading dies, cold drawing dies, etc., which press-form work pieces in a cold state, generally requiring high hardness, high wear resistance, adequate toughness, good fatigue resistance, and seizure resistance bonding capability. Therefore, the cold-working die steel is generally designed by adopting high-carbon high-chromium basic components, is widely used in the die industry, has high hardenability, has little deformation during quenching, and can still keep good hardness and wear resistance at 300-400 ℃. Because the cold-working die steel has higher carbon content and is very sensitive to cracks, the cold-working die steel has developed ledeburitic tissue, and the steel grade has low melting point and strong crack sensitivity, so that the production difficulty of the steel grade is very high.
In the production of high-carbon die steel continuous casting blanks, cracks or brittle failures of the obtained billets are unavoidable in the subsequent production and molding.
Disclosure of Invention
The invention provides a die steel billet and a continuous casting method thereof aiming at the problems.
A first object of the present invention is to provide a method for continuously casting a die billet, comprising:
smelting raw materials into molten steel, continuously casting the molten steel into a blank, and then annealing to obtain a die steel blank;
wherein the molten steel comprises the following components in percentage by weight: 1.5-1.90% of carbon, less than or equal to 0.60% of manganese, less than or equal to 0.6% of silicon, 10-13% of chromium, 0.2-0.7% of molybdenum, 0.15-0.25% of vanadium, 30-100 ppm of rhenium and the balance of iron and impurities;
in the continuous casting process, the water quantity of the crystallizer is more than or equal to 110L/min, the water pressure is more than or equal to 0.6Mpa, and the water inlet and outlet temperature difference is less than or equal to 12 ℃.
Further, the H content of the molten steel is less than or equal to 3ppm, and the O content is less than or equal to 50ppm.
Further, in the casting process, the superheat degree of the molten steel is controlled to be 15-25 ℃ or the casting temperature is controlled to be 1405-1415 ℃.
Further, in the continuous casting process, the alkalinity of the covering slag is 0.60-1, the melting point of the covering slag is 860-960 ℃, and the viscosity of the covering slag is less than or equal to 0.15 Pa.S.
Further, in the continuous casting process, the pulling speed is 0.55-m/min-1.2 m/min.
Further, in the continuous casting process, the molten steel is subjected to aerosol cooling, the specific water quantity of secondary cooling is more than or equal to 2.3L/kg, and the hot delivery temperature is more than or equal to 510 ℃.
Further, the annealing temperature is 780-860 ℃.
Further, in the annealing process, the heating rate is less than or equal to 50 ℃/min, the heat preservation time is more than or equal to 5h, and the cooling rate is less than or equal to 30 ℃/min.
Another object of the present invention is to provide a die billet made by the following continuous casting method:
smelting raw materials into molten steel, continuously casting the molten steel into a blank, and then annealing to obtain a die steel blank;
wherein the molten steel comprises the following components in percentage by weight: 1.5-1.90% of carbon, less than or equal to 0.60% of manganese, less than or equal to 0.6% of silicon, 10-13% of chromium, 0.2-0.7% of molybdenum, 0.15-0.25% of vanadium, 30-100 ppm of rhenium and the balance of iron and impurities;
in the continuous casting process, the water quantity of the crystallizer is more than or equal to 110L/min, the water pressure is more than or equal to 0.6Mpa, and the water inlet and outlet temperature difference is less than or equal to 12 ℃.
The invention has the beneficial effects that:
the invention sets the components of the molten steel of the die steel billet, and specifically comprises the following steps: 1.5-1.90% of carbon, less than or equal to 0.60% of manganese, less than or equal to 0.6% of silicon, 10-13% of chromium, 0.2-0.7% of molybdenum, 0.15-0.25% of vanadium, 30-100 ppm of rhenium and the balance of iron and impurities, and by matching with reasonable continuous casting process parameter setting, the surface of the obtained billet has no problems of point leakage, cracks and the like, the internal quality of a continuous casting billet meets the requirements, the quality defect does not exist, the production quality of the obtained billet is improved, and the qualification rate of billet forming products is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a billet produced by the continuous casting method according to the first embodiment of the present invention;
fig. 2 shows a steel bar rolled from a billet according to a first embodiment of the present invention;
fig. 3 shows a steel bar rolled from a steel billet according to a comparative example one of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
the method is applied to prepare a high-carbon die steel continuous casting billet with the thickness of 200mm multiplied by 200mm by using a vertical-bending continuous casting machine;
molten steel target components: 1.5% of carbon, 0.30% of manganese, 0.3% of silicon, 13% of chromium, 0.4% of molybdenum, 0.3% of vanadium, 50ppm of rhenium and the balance of iron and impurities;
controlling the qualified superheat degree of the cast molten steel at 20 ℃, and controlling the fluctuation of the temperature of the molten steel in a tundish to be within +/-5 ℃ in the casting process, wherein the H content of the molten steel is less than or equal to 3ppm, and the O content is less than or equal to 50pp;
the alkalinity of the special casting powder for high-carbon die steel is 0.7, the melting point is 885 ℃, the viscosity is 0. Pa.S, the cooling water quantity of a crystallizer is 110L/min, the water pressure is 0.6Mpa, the water inlet and outlet temperature difference is 5 ℃, the continuous casting pulling speed is 0.55m/min, the molten steel is subjected to aerosol cooling, the secondary cooling specific water quantity=2.7L/kg, the temperature of a casting blank straightening section is 850 ℃, the final continuous casting blank ingot hot feeding temperature is 600 ℃, the annealing temperature is 800 ℃, the temperature rising rate is 40 ℃/min, the heat preservation time is 15h, the cooling rate is 20 ℃/min, and finally the billet is manufactured.
The steel billet obtained by the method is specifically shown in fig. 1, and as can be seen from fig. 1, the surface of the steel billet produced by continuous casting in the embodiment has no problems of point leakage, cracks and the like, and the internal quality of the continuous casting meets the requirement and has no quality defect.
Embodiment two:
the embodiment is to use the method of the invention to prepare 150mm multiplied by 150mm high carbon die steel continuous casting blank by using a vertical bending continuous casting machine;
molten steel target components: 1.60% of carbon, 0.40% of manganese, 0.5% of silicon, 11% of chromium, 0.5% of molybdenum, 0.2% of vanadium, 90ppm of rhenium and the balance of iron and impurities;
controlling the qualified temperature of the cast molten steel at 1410 ℃, and controlling the fluctuation of the temperature of the molten steel in a tundish to be within +/-4 ℃ in the casting process, wherein the H content of the molten steel is less than or equal to 3ppm, and the O content of the molten steel is less than or equal to 50ppm;
the alkalinity of the special casting powder for high-carbon die steel is 0.7, the melting point is 900 ℃, the viscosity is 0.12 Pa S, the cooling water quantity of a crystallizer is 115L/min, the water pressure is 0.8Mpa, the water inlet and outlet temperature difference is 7 ℃, the continuous casting drawing speed is 0.8 m/min, the molten steel is subjected to aerosol cooling, the secondary cooling specific water quantity=2.6L/kg, the temperature of a casting blank straightening section is 830 ℃, the final continuous casting blank ingot hot feeding temperature is 550 ℃, the annealing temperature is 800 ℃, the temperature rising rate is 40 ℃/min, the heat preservation time is 12h, the cooling rate is 20 ℃/min, and finally the steel billet is manufactured.
Embodiment III:
the embodiment is to use the method of the invention to prepare 150mm multiplied by 150mm high carbon die steel continuous casting blank by using a vertical bending continuous casting machine;
molten steel target components: 1.90% of carbon, 0.20% of manganese, 0.3% of silicon, 13% of chromium, 0.7% of molybdenum, 0.25% of vanadium, 80ppm of rhenium and the balance of iron and impurities;
controlling the qualified temperature of the cast molten steel at 1410 ℃, and controlling the fluctuation of the temperature of the molten steel in a tundish to be within +/-3 ℃ in the casting process, wherein the H content of the molten steel is less than or equal to 3ppm, and the O content of the molten steel is less than or equal to 50ppm;
the alkalinity of the special casting powder for high-carbon die steel is 0.8, the melting point is 890 ℃, the viscosity is 0.08 Pa S, the cooling water quantity of a crystallizer is 120L/min, the water pressure is 0.8Mpa, the water inlet and outlet temperature difference is 8 ℃, the continuous casting drawing speed is 1.2m/min, the molten steel is subjected to aerosol cooling, the secondary cooling specific water quantity=2.6L/kg, the temperature of a casting blank straightening section is 830 ℃, the final continuous casting blank ingot hot feeding temperature is 550 ℃, the annealing temperature is 800 ℃, the temperature rising rate is 40 ℃/min, the heat preservation time is 15h, the cooling rate is 20 ℃/min, and finally the billet is manufactured.
Comparative example one
The comparative example is to prepare a high-carbon die steel continuous casting billet with the thickness of 200mm multiplied by 200mm by using a vertical bending type continuous casting machine;
molten steel target components: 1.5% of carbon, 0.30% of manganese, 0.3% of silicon, 13% of chromium, 0.4% of molybdenum, 0.3% of vanadium and the balance of iron and impurities;
controlling the qualified superheat degree of the cast molten steel at 20 ℃, and controlling the fluctuation of the temperature of the molten steel in a tundish to be within +/-5 ℃ in the casting process, wherein the H content of the molten steel is less than or equal to 3ppm, and the O content is less than or equal to 50pp;
the alkalinity of the special casting powder for high-carbon die steel is 0.7, the melting point is 885 ℃, the viscosity is 0. Pa.S, the cooling water quantity of a crystallizer is 105L/min, the water pressure is 0.4Mpa, the water inlet and outlet temperature difference is 5 ℃, the continuous casting pulling speed is 0.8 m/min, the molten steel is subjected to aerosol cooling, the secondary cooling specific water quantity=2.7L/kg, the temperature of a casting blank straightening section is 850 ℃, the final continuous casting blank ingot hot feeding temperature is 600 ℃, the annealing temperature is 800 ℃, the temperature rising rate is 40 ℃/min, the heat preservation time is 15h, the cooling rate is 20 ℃/min, and finally the billet is manufactured.
Example IV
The billets obtained in example one and comparative example one were rolled into bars, and the resulting rolled bars are shown in fig. 2 and 3, wherein fig. 2 is a bar obtained by rolling the billets obtained in example one, and fig. 3 is a bar obtained by rolling the billets obtained in comparative example one.
As can be seen from fig. 2 and 3, the billet obtained in the first embodiment is well formed and free of defects, and the billet obtained in the first comparative embodiment is prone to crack defects, i.e. it is proved that the introduction of rhenium not only improves the quality of the billet produced by continuous casting, but also ensures the qualification rate of the billet formed product.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method of continuously casting a die billet, comprising:
smelting raw materials into molten steel, continuously casting the molten steel into a blank, and then annealing to obtain a die steel blank;
wherein the molten steel comprises the following components in percentage by weight: 1.5-1.90% of carbon, less than or equal to 0.60% of manganese, less than or equal to 0.6% of silicon, 10-13% of chromium, 0.2-0.7% of molybdenum, 0.15-0.25% of vanadium, 30-100 ppm of rhenium and the balance of iron and impurities;
in the continuous casting process, the water quantity of the crystallizer is more than or equal to 110L/min, the water pressure is more than or equal to 0.6Mpa, and the water inlet and outlet temperature difference is less than or equal to 12 ℃.
2. The method for continuously casting a mold steel billet according to claim 1, wherein the molten steel has an H content of 3ppm or less and an O content of 50ppm or less.
3. The continuous casting method of a mold steel billet according to claim 1, wherein the superheat degree of the molten steel is controlled to be 15 ℃ to 25 ℃ or the casting temperature is controlled to be 1405 ℃ to 1415 ℃ in the casting process.
4. The continuous casting method of a mold steel billet according to claim 1, wherein in the continuous casting process, the alkalinity of the mold flux is 0.60-1, the melting point of the mold flux is 860-960 ℃, and the viscosity of the mold flux is less than or equal to 0.15 pa.s.
5. The method according to claim 1, wherein the pulling rate is 0.55-m/min-1.2 m/min during the continuous casting.
6. The continuous casting method of a mold steel billet according to claim 1, wherein in the continuous casting process, molten steel is subjected to aerosol cooling, the specific water quantity of secondary cooling is more than or equal to 2.3L/kg, and the hot delivery temperature is more than or equal to 510 ℃.
7. The continuous casting method of a mold steel billet according to any one of claims 1 to 6, wherein the molten steel is continuously cast into a billet, and the temperature is 780 ℃ to 860 ℃ in the subsequent annealing.
8. The continuous casting method of a mold steel billet according to claim 7, wherein in the annealing process, the heating rate is less than or equal to 50 ℃/min, the heat preservation time is more than or equal to 5h, and the cooling rate is less than or equal to 30 ℃/min.
9. A die steel blank, characterized by being produced by the continuous casting method according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311378585.6A CN117127119B (en) | 2023-10-24 | 2023-10-24 | Mould steel billet and continuous casting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311378585.6A CN117127119B (en) | 2023-10-24 | 2023-10-24 | Mould steel billet and continuous casting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117127119A true CN117127119A (en) | 2023-11-28 |
| CN117127119B CN117127119B (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202311378585.6A Active CN117127119B (en) | 2023-10-24 | 2023-10-24 | Mould steel billet and continuous casting method thereof |
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