CN114507812A - Preparation method of die steel material with excellent hardening property and toughness - Google Patents
Preparation method of die steel material with excellent hardening property and toughness Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 57
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000005261 decarburization Methods 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 238000005242 forging Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21C7/0006—Adding metallic additives
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- 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
- C21C7/072—Treatment with gases
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- 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
- C21C7/076—Use of slags or fluxes as treating agents
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- 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
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- 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
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention discloses a preparation method of a die steel material with excellent hardening and toughness, which comprises the following components in percentage by weight: c: 0.38-0.45%, Si: 0.70-1.0%, Mn: 0.30-0.60%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.10-5.50%, Ni: 0.80-1.20%, Mo: 1.40-1.75%, V: 0.40-0.75%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe; during preparation, the die steel material with excellent hardenability and toughness is prepared by adopting an EBT smelting-LF refining-VD vacuum degassing-ESR electroslag remelting smelting process-steel ingot annealing process, and has the hardness of 245-205 HB and the high-temperature toughness superior to domestic similar products.
Description
Technical Field
The invention relates to the technical field of tool and die steel materials, in particular to a preparation method of a die steel material with excellent hardenability and toughness.
Background
H13 belongs to hot work die steel, and is a steel grade formed by adding alloy elements on the basis of carbon steel, and the grade is 4Cr5MoSiV 1. The composite material has good comprehensive performance at medium temperature (600 ℃), high hardenability (namely, the composite material can be hardened in air), low heat treatment deformation rate and performance and service life higher than 3Cr2W 8V. The die forging die can be used for die forging hammer forging dies, aluminum alloy die-casting dies, hot extrusion dies, high-speed precision forging dies, forging press dies and the like.
However, in some application scenarios, the steel is required to have better hardenability and toughness, which requires corresponding adjustment to the die steel to meet the working condition requirement. Therefore, the development of a die steel material with excellent hardenability and toughness and a preparation method thereof are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a preparation method of a die steel material with excellent hardenability and toughness, aiming at the problem that the steel ball is required to have better hardenability and toughness in certain application scenes at present, but the performance of the existing steel material cannot meet the requirements.
The invention relates to a preparation method of a die steel material with excellent hardenability and toughness, which comprises the following components in percentage by weight: c: 0.38-0.45%, Si: 0.70-1.0%, Mn: 0.30-0.60%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.10-5.50%, Ni: 0.80-1.20%, Mo: 1.40-1.75%, V: 0.40-0.75%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe;
the preparation method of the die steel material comprises the following steps:
(1) preparing materials: adopting 40% of new iron material, 20% of returned iron scrap material and 40% of returned iron block material, wherein the returned iron block material does not contain oil stain, impurities and rust, and roasting the alloy for later use;
(2) EBT smelting: adding the prepared iron material into an electric arc furnace for smelting, and adding a slagging agent for decarburization until the decarburization amount is more than or equal to 0.30%; sampling and analyzing, adjusting chemical components to be close to the lower limit of control components, tapping, and controlling the tapping temperature to be 1640-1670 ℃;
(3) LF refining: setting the refining temperature to 1580-1630 ℃, mainly using active calcium as a slagging agent, controlling the alkalinity to be 2.5-3.5, and keeping the white slag time to be more than 30 minutes after the slag is white; adding alloy elements for fine adjustment; keeping the temperature not lower than 1670 ℃ 10 minutes before the hoisting bag is vacuumized;
(4) VD vacuum degassing: controlling the vacuum degree to be less than or equal to 67Pa during degassing, keeping the time to be more than or equal to 8 minutes under the pressure, keeping argon blowing, degassing until the [ N ] is less than or equal to 80ppm, the [ H ] is less than or equal to 4ppm and the [ O ] is less than or equal to 20ppm, and then carrying out ladle casting when the temperature reaches 1560 ℃;
(5) pouring: the pouring system is clean and dry, so that foreign impurities and gas are prevented from being brought into steel; controlling the liquid level of the steel to rise stably and at a constant speed in the die; the dosage of the covering slag is 2.5kg/t, and the liquid steel surface is strictly prevented from being exposed after rolling;
(6) ESR electroslag remelting: during electroslag remelting, the filling ratio is 0.3-0.4, the large end of the electrode rod faces downwards, and the segregation of an electroslag ingot is reduced or eliminated;
(7) annealing the steel ingot: and (3) cooling the material to 600-700 ℃, heating to 800-840 ℃ at a heating rate of 70-90 ℃/h, preserving the heat for (7 + Q/4) h, cooling to below 350 ℃ at a cooling rate of 30-40 ℃/h, and air-cooling to obtain the material.
Preferably, the method for preparing the die steel material with excellent hardenability and toughness comprises the following components in percentage by weight: c: 0.41%, Si: 0.85%, Mn: 0.45%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.30%, Ni: 1.0%, Mo: 1.55%, V: 0.60%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe.
The high-temperature-resistant artificial crystal forming die steel material disclosed by the invention has the following characteristics:
1. extremely low in harmful elements: the steel grade has P less than or equal to 0.020%, S less than or equal to 0.010%, N less than or equal to 80PPM, H less than or equal to 4PPm and O less than or equal to 20 PPM; various performances of the steel are ensured;
2. by adding a proper amount of Ni and adjusting the content of other alloy components, the steel material is promoted to generate good hardenability and toughness;
3. good mechanical property isotropy: the steel material provided by the invention has good hardenability and toughness, retains the good comprehensive mechanical properties of the original die steel material, and has high material uniformity.
The high-hardenability and high-toughness die steel material is successfully researched and developed through repeated tests, component adjustment and production process optimization of the applicant and the inventor, has the hardness and comprehensive mechanical properties of common H13 steel, strengthens the hardenability and toughness, and is proved by trial of part of manufacturers that the hardenability and toughness meet the working condition requirements of the manufacturers.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
Example 1
A preparation method of a die steel material with excellent hardenability and toughness comprises the following components in percentage by weight: c: 0.41%, Si: 0.85%, Mn: 0.45%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.30%, Ni: 1.0%, Mo: 1.55%, V: 0.60%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe.
The preparation method of the die steel material comprises the following steps:
(1) preparing materials: adopting 40% of new iron material, 20% of returned iron scrap material and 40% of returned iron block material, wherein the returned iron block material does not contain oil stain, impurities and rust, and roasting the alloy for later use;
(2) EBT smelting: adding the prepared iron material into an electric arc furnace for smelting, and adding a slag former for decarburization until the decarburization amount is more than or equal to 0.30%; sampling and analyzing, adjusting chemical components to be close to the lower limit of control components, tapping, and controlling the tapping temperature to be 1660 ℃;
(3) LF refining: setting the refining temperature to 1600 ℃, mainly using active calcium as a slagging agent, controlling the alkalinity to be 2.8, and keeping the white slag time to be more than 30 minutes after the slag is white; adding alloy elements for fine adjustment; keeping the temperature not lower than 1670 ℃ 10 minutes before the hoisting bag is vacuumized;
(4) VD vacuum degassing: controlling the vacuum degree to be less than or equal to 67Pa during degassing, keeping the time to be more than or equal to 8 minutes under the pressure, keeping argon blowing, degassing until the [ N ] is less than or equal to 80ppm, the [ H ] is less than or equal to 4ppm and the [ O ] is less than or equal to 20ppm, and then carrying out ladle casting when the temperature reaches 1560 ℃;
(5) pouring: the pouring system is clean and dry, so that foreign impurities and gas are prevented from being brought into steel; controlling the liquid level of the steel to rise stably and at a constant speed in the die; the dosage of the covering slag is 2.5kg/t, and the liquid steel surface is strictly prevented from being exposed after rolling;
(6) ESR electroslag remelting: during electroslag remelting, the filling ratio is 0.35, the large end of the electrode rod faces downwards, and the segregation of an electroslag ingot is reduced or eliminated;
(7) annealing the steel ingot: cooling the material to 650 ℃, heating to 820 ℃ at a heating rate of 80 ℃/h, preserving the heat for (7 + Q/4) h, cooling to below 350 ℃ at a cooling rate of 35 ℃/h, and cooling in the air to obtain the material.
Example 2
A preparation method of a die steel material with excellent hardenability and toughness comprises the following components in percentage by weight: c: 0.38, Si: 1.0%, Mn: 0.30, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.50%, Ni: 0.80, Mo: 1.75%, V: 0.40, [ N ] less than or equal to 80ppm, [ H ] less than or equal to 4ppm, [ O ] less than or equal to 20ppm, and the balance of Fe;
the preparation method of the die steel material comprises the following steps:
(1) preparing materials: adopting 40% of new iron material, 20% of returned iron scrap material and 40% of returned iron block material, wherein the returned iron block material does not contain oil stain, impurities and rust, and roasting the alloy for later use;
(2) EBT smelting: adding the prepared iron material into an electric arc furnace for smelting, and adding a slag former for decarburization until the decarburization amount is more than or equal to 0.30%; sampling and analyzing, adjusting chemical components to be close to the lower limit of control components, tapping, and controlling the tapping temperature to be 1640 ℃;
(3) LF refining: setting the refining temperature at 1630 ℃, mainly using active calcium as a slagging agent, controlling the alkalinity at 2.5, and keeping the white slag time for more than 30 minutes after the white slag; adding alloy elements for fine adjustment; keeping the temperature not lower than 1670 ℃ 10 minutes before the hoisting bag is vacuumized;
(4) VD vacuum degassing: controlling the vacuum degree to be less than or equal to 67Pa during degassing, keeping the time to be more than or equal to 8 minutes under the pressure, keeping argon blowing, degassing until the [ N ] is less than or equal to 80ppm, the [ H ] is less than or equal to 4ppm and the [ O ] is less than or equal to 20ppm, and then carrying out ladle casting when the temperature reaches 1560 ℃;
(5) pouring: the pouring system is clean and dry, so that foreign impurities and gas are prevented from being brought into steel; controlling the liquid level of the steel to rise stably and at a constant speed in the die; the dosage of the covering slag is 2.5kg/t, and the liquid steel surface is strictly prevented from being exposed after rolling;
(6) ESR electroslag remelting: during electroslag remelting, the filling ratio is 0.4, the large end of the electrode rod faces downwards, and the segregation of an electroslag ingot is reduced or eliminated;
(7) annealing the steel ingot: cooling the material to 600 ℃, heating to 800 ℃ at a heating rate of 90 ℃/h, preserving the heat for (7 + Q/4) h, cooling to below 350 ℃ at a cooling rate of 40 ℃/h, and cooling in the air to obtain the material.
Example 3
A preparation method of a die steel material with excellent hardenability and toughness comprises the following components in percentage by weight: c: 0.45%, Si: 0.70, Mn: 0.60%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.10, Ni: 1.20%, Mo: 1.75%, V: 0.40%, N < 80ppm, H < 4ppm, O < 20ppm, and Fe in balance;
the preparation method of the die steel material comprises the following steps:
(1) preparing materials: adopting 40% of new iron material, 20% of returned iron scrap material and 40% of returned iron block material, wherein the returned iron block material does not contain oil stain, impurities and rust, and roasting the alloy for later use;
(2) EBT smelting: adding the prepared iron material into an electric arc furnace for smelting, and adding a slag former for decarburization until the decarburization amount is more than or equal to 0.30%; sampling and analyzing, adjusting chemical components to be close to the lower limit of control components, tapping, and controlling the tapping temperature to be 1670 ℃;
(3) LF refining: setting the refining temperature to 1580 ℃, mainly using active calcium as a slagging agent, controlling the alkalinity to be 3.5, and keeping the white slag time to be more than 30 minutes after the slag is white; adding alloy elements for fine adjustment; keeping the temperature not lower than 1670 ℃ 10 minutes before the hoisting bag is vacuumized;
(4) VD vacuum degassing: controlling the vacuum degree to be less than or equal to 67Pa during degassing, keeping the time to be more than or equal to 8 minutes under the pressure, keeping argon blowing, degassing until the [ N ] is less than or equal to 80ppm, the [ H ] is less than or equal to 4ppm and the [ O ] is less than or equal to 20ppm, and then carrying out ladle casting when the temperature reaches 1560 ℃;
(5) pouring: the pouring system is clean and dry, so that foreign impurities and gas are prevented from being brought into steel; controlling the liquid level of the steel to rise stably and at a constant speed in the die; the dosage of the covering slag is 2.5kg/t, and the liquid steel surface is strictly prevented from being exposed after rolling;
(6) ESR electroslag remelting: during electroslag remelting, the filling ratio is 0.3, the large end of the electrode rod faces downwards, and the segregation of an electroslag ingot is reduced or eliminated;
(7) annealing the steel ingot: cooling the material to 700 ℃, heating to 840 ℃ at a heating rate of 70 ℃/h, preserving the heat for (7 + Q/4) h, cooling to below 350 ℃ at a cooling rate of 30 ℃/h, and cooling in the air to obtain the material.
Claims (2)
1. The preparation method of the die steel material with excellent hardenability and toughness is characterized in that the die steel material contains the following components in percentage by weight: c: 0.38-0.45%, Si: 0.70-1.0%, Mn: 0.30-0.60%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Cr: 5.10-5.50%, Ni: 0.80-1.20%, Mo: 1.40-1.75%, V: 0.40-0.75%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe;
the preparation method of the die steel material comprises the following steps:
(1) preparing materials: adopting 40% of new iron material, 20% of returned iron scrap material and 40% of returned iron block material, wherein oil stain, impurities and rust cannot be generated in the returned iron material, and roasting the alloy for later use;
(2) EBT smelting: adding the prepared iron material into an electric arc furnace for smelting, and adding a slag former for decarburization until the decarburization amount is more than or equal to 0.30%; sampling and analyzing, adjusting chemical components to be close to the lower limit of control components, tapping, and controlling the tapping temperature to be 1640-1670 ℃;
(3) LF refining: setting the refining temperature to 1580-1630 ℃, mainly using active calcium as a slagging agent, controlling the alkalinity to be 2.5-3.5, and keeping the white slag time to be more than 30 minutes after the slag is white; adding alloy elements for fine adjustment; keeping the temperature not lower than 1670 ℃ 10 minutes before the hoisting bag is vacuumized;
(4) VD vacuum degassing: controlling the vacuum degree to be less than or equal to 67Pa during degassing, keeping the time to be more than or equal to 8 minutes under the pressure, keeping argon blowing, degassing until the [ N ] is less than or equal to 80ppm, the [ H ] is less than or equal to 4ppm and the [ O ] is less than or equal to 20ppm, and then carrying out ladle casting when the temperature reaches 1560 ℃;
(5) pouring: the pouring system is clean and dry, so that foreign impurities and gas are prevented from being brought into steel; controlling the liquid level of the steel to rise stably and at a constant speed in the die; the dosage of the covering slag is 2.5kg/t, and the liquid steel surface is strictly prevented from being exposed after rolling;
(6) ESR electroslag remelting: during electroslag remelting, the filling ratio is 0.3-0.4, the large end of the electrode rod faces downwards, and the segregation of an electroslag ingot is reduced or eliminated;
(7) annealing the steel ingot: and (3) cooling the material to 600-700 ℃, heating to 800-840 ℃ at a heating rate of 70-90 ℃/h, preserving the heat for (7 + Q/4) h, cooling to below 350 ℃ at a cooling rate of 30-40 ℃/h, and air-cooling to obtain the material.
2. The method as claimed in claim 1, wherein the die steel material comprises the following components in percentage by weight: c: 0.41%, Si: 0.85%, Mn: 0.45%, P: less than or equal to 0.020%, S: less than or equal to 0.010%, Cr: 5.30%, Ni: 1.0%, Mo: 1.55%, V: 0.60%, N is less than or equal to 80ppm, H is less than or equal to 4ppm, O is less than or equal to 20ppm, and the balance is Fe.
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| CN115896634A (en) * | 2022-12-19 | 2023-04-04 | 湖北志联模具科技有限公司 | High-temperature-resistant non-ferrous metal die-casting forming die steel material and preparation method thereof |
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| CN115896634A (en) * | 2022-12-19 | 2023-04-04 | 湖北志联模具科技有限公司 | High-temperature-resistant non-ferrous metal die-casting forming die steel material and preparation method thereof |
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