CN114107842A - Microalloyed high-strength high-hardness pre-hardened plastic die steel and preparation method thereof - Google Patents
Microalloyed high-strength high-hardness pre-hardened plastic die steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000005242 forging Methods 0.000 claims abstract description 25
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 11
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 230000000171 quenching effect Effects 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000003723 Smelting Methods 0.000 claims description 12
- 238000007550 Rockwell hardness test Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000009849 vacuum degassing Methods 0.000 claims description 6
- 229910001214 P-type tool steel Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000005498 polishing Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 14
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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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- 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
- C22C—ALLOYS
- 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 relates to the field of component design and heat treatment of metal materials, in particular to microalloyed high-strength high-hardness pre-hardened plastic die steel and a preparation method thereof. The die steel comprises the following chemical components in percentage by mass: 0.30-0.35 wt.% of C, 0.30-0.35 wt.% of Si, 1.50-1.55 wt.% of Mn, 1.90-2.10 wt.% of Cr, 0.15-0.25 wt.% of Mo, 0.90-1.10 wt.% of Ni, 0.10-0.30 wt.% of V, the total amount of Ce and La is less than or equal to 0.02 wt.%, P is less than or equal to 0.01 wt.%, S is less than or equal to 0.01 wt.%, and the balance is Fe. Based on the V element microalloying idea, the invention optimizes the alloy component design, prepares the as-cast blank according to the component proportion, heats and preserves the temperature, then carries out three-dimensional forging and subsequent normalizing, quenching and high-temperature tempering heat treatment, develops the high-quality pre-hardened plastic die steel with high strength, hardness and mirror polishing property, and has remarkable social and economic benefits.
Description
Technical Field
The invention relates to the field of component design and heat treatment of metal materials, in particular to microalloyed high-strength high-hardness pre-hardened plastic die steel and a preparation method thereof.
Background
The plastic die steel commonly used at present comprises American brand P20, Swedish ASSAB brand 718/718H, Germany brand 1.2738 and the like. The 718H series plastic die steel needs to be subjected to quenching and high-temperature tempering modulation treatment before being delivered out of a warehouse, a die manufacturing factory directly performs machining forming without subsequent heat treatment deformation, the quality problems of decarburization, cracking, deformation and the like of the die caused by the modulation treatment can be avoided, and the die steel is widely applied and occupies a large share in the die steel market. The high-quality pre-hardened 718H plastic die steel has excellent strength, wear resistance, hardness uniformity, cutting processability, polishing performance and the like.
At this stage, there is an urgent need to extend the service life of die steels for economic and environmental reasons. The 718H die steel is mainly used for improving the toughness of materials by optimizing a heat treatment mode, and research work is mainly focused on a pretreatment stage before modulation treatment, including improved normalizing treatment, improved isothermal spheroidizing annealing treatment and the like. However, how to further improve the performance based on the optimal heat treatment system to meet the requirements of the die steel for a more severe service environment and a longer service life has become one of the directions of domestic and foreign research, and the rational blending of the alloy proportion has become an important way of research. In industrial production, the high cross-sectional hardness value of the die steel represents its high polishing performance.
Disclosure of Invention
The invention aims to provide microalloyed high-strength high-hardness pre-hardened plastic die steel and a preparation method thereof, so as to improve the strength, hardness and polishing performance of materials.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a microalloyed high-strength high-hardness pre-hardened plastic die steel comprises the following chemical components in percentage by mass: 0.30-0.35 wt.% of C, 0.30-0.35 wt.% of Si, 1.50-1.55 wt.% of Mn, 1.90-2.10 wt.% of Cr, 0.15-0.25 wt.% of Mo, 0.90-1.10 wt.% of Ni, 0.10-0.30 wt.% of V, the total amount of Ce and La is less than or equal to 0.02 wt.%, P is less than or equal to 0.01 wt.%, S is less than or equal to 0.01 wt.%, and the balance is Fe.
The microalloyed high-strength high-hardness pre-hard plastic die steel has the total content of Ce and La of 0.01-0.02 wt.%.
The microalloyed high-strength high-hardness pre-hardened plastic die steel comprises smelting, forging and performance heat treatment, and comprises the following specific steps:
(1) smelting: vacuum induction melting → vacuum degassing treatment to ensure the purity of molten steel; after vacuum degassing, adding rare earth alloy with the purity of more than 99.99 wt.% for final deoxidation and impurity change refining treatment, finally meeting the chemical component requirement of the pre-hard plastic die steel, and pouring a steel ingot of the pre-hard plastic die steel;
(2) forging: carrying out three-dimensional forging treatment on the steel ingot of the pre-hardened plastic die steel meeting the composition requirements, wherein the forging temperature is controlled to be 950-1150 ℃;
(3) normalizing: after forging the steel ingot, normalizing at 870 +/-20 ℃ for 1-5 h, air-cooling, and performing tissue normalizing superfine treatment;
(4) modulation heat treatment: after normalizing and superfine treatment, heating to 860 +/-20 ℃ at the heating rate of 80-120 ℃/h, preserving heat for 1-5 h, and then cooling to room temperature through oil quenching; the tempering temperature is 600-650 ℃, and the temperature is kept for 2-5 h and then the air cooling is carried out to the room temperature.
The microalloyed high-strength high-hardness pre-hardened plastic die steel has the standard tensile sample size of the pre-hardened plastic die steel according to the national standard GB/T228-2002, and 5-15 points are selected for each hardness test sample to carry out average Rockwell hardness test.
The design idea of the invention is as follows:
vanadium (V) is a common microalloy element, and is easy to form a nano precipitated phase pinning grain boundary in the steel tempering process to generate a certain precipitation strengthening effect. Research shows that trace V element can raise the strength and hardness of steel effectively. In addition, the V element is easy to be partially polymerized at an austenite Grain Boundary (GB) to reduce the grain boundary energy, simultaneously inhibits the diffusion of C atoms, can effectively delay the nucleation of ferrite/pearlite and improve the hardenability of the material.
On the basis of effectively improving the hardenability of the material, the invention is based on the V element microalloying thought, an as-cast blank is prepared by optimizing the alloy component design and according to the component proportion, three-dimensional forging and subsequent normalizing, quenching and high-temperature tempering heat treatment are carried out after heating and heat preservation, and high-quality pre-hardened plastic die steel with high strength, hardness and mirror finish is developed by regulating and controlling the dispersion precipitation of a nano-scale MC precipitation phase to pin the dislocation of a matrix and reduce the mobility of the matrix. Meanwhile, the addition of trace V does not change the heat treatment process of the material, and the research conclusion has greater value for practical industrial application.
The invention has the advantages and beneficial effects that:
1. based on the microalloying idea, the method utilizes the MC carbide precipitated by the V element in the high-temperature tempering process of the plastic die steel to be dispersion strengthened so as to increase the strength and hardness of the base material and comprehensively improve the polishing performance of the material. The invention is in line with the development trend of the current plastic die steel and has very wide application prospect.
2. The invention can be operated on the basis of the existing production process. The trace V element is added on the basis of the original alloy components to improve the strength and hardness of the material, so that the high-end plastic die steel with relatively low cost and reasonable matching of microalloying and comprehensive mechanical properties is realized, and the high-end plastic die steel has remarkable social and economic benefits.
3. The microalloyed high-strength high-hardness pre-hardened plastic die steel has the following performance indexes: the yield strength is 950-1000 MPa, the tensile strength is 1050-1110 MPa, and the average hardness is 33-35 HRC.
Drawings
FIG. 1 is a curve showing the evolution of yield strength and tensile strength of 718H die steel in different V content test steels. In the figure, the abscissa represents the content of the V element, and the ordinate Strength represents the Yield Strength (Yield Strength) or Tensile Strength (Tensile Strength).
FIG. 2 is an evolution curve of the hardness values of the sections of the 718H die steel in different V content test steels. In the figure, the abscissa 1# to 10# represents 10 points selected for each Hardness test specimen, and the ordinate Hardness represents Rockwell Hardness (HRC).
Detailed Description
In the specific implementation process, the invention provides microalloyed high-strength high-hardness pre-hardened plastic die steel and a preparation method thereof. Compared with the conventional 718H plastic die steel, the novel alloy element V is added to form a nano-scale precipitated phase pinning crystal boundary in the steel tempering process, and a certain precipitation strengthening effect is generated to improve the room temperature strength, hardness and polishing performance of the pre-hardened plastic die steel.
The microalloyed high-strength high-hardness pre-hardened plastic die steel and the preparation method thereof comprise the following steps:
(1) smelting: vacuum induction smelting furnace → vacuum degassing treatment to ensure high purity of molten steel; after vacuum degassing, adding rare earth alloy with the purity of more than 99.99 wt.% for final deoxidation and impurity change refining treatment, and finally meeting the chemical component requirement of the pre-hardened plastic die steel;
(2) forging: carrying out three-dimensional forging (repeated thermal deformation along X, Y, Z directions) treatment on the steel ingot of the pre-hardened plastic die steel meeting the composition requirements, wherein the forging temperature is controlled to be 950-1150 ℃;
(3) normalizing: normalizing after forging, selecting the heating temperature of 870 +/-20 ℃, keeping the temperature for 1-5 h, then air-cooling, and performing tissue normalizing superfine treatment;
(4) modulation heat treatment: heating the sample subjected to normalizing superfine treatment to 860 +/-20 ℃ at a heating rate of 80-120 ℃/h, preserving heat for 1-5 h, and then cooling to room temperature through oil quenching; tempering temperature is 600-650 ℃, heat preservation is carried out for 2-5 hours, and then air cooling is carried out to room temperature; in the mechanical property experiment, the size of a standard tensile sample is in accordance with the national standard GB/T228-2002, and 5-15 points are selected for each hardness test sample to carry out the average Rockwell hardness test.
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Example 1
In this example, a microalloyed high strength and high hardness pre-hardened plastic mold steel and a method for preparing the same were determined, wherein:
the high-strength high-hardness pre-hardened plastic die steel comprises the following components in percentage by mass: c0.34 wt.%, Si 0.32 wt.%, Mn 1.51 wt.%, Cr 2.01 wt.%, Mo 0.18 wt.%, Ni 1.05 wt.%, V0.1 wt.%, the total amount of Ce and La is 0.0095 wt.% (the ratio of Ce to La element mass fractions is 7: 3), P0.007 wt.%, S0.003 wt.%, the remainder being Fe elements, the total amount adding 100 wt.%.
The materials are mixed according to the mass ratio of the chemical components, and 25kg of vacuum induction smelting furnace is used for smelting the materials into steel ingots. The ingot obtained was then heated to 1150 ℃ at a rate of 100 ℃/h and was then fully fired before forging, the finish forging temperature being 950 ℃ and the final dimensions 65mm x 720 mm. Heating the steel to be heat-treated to 870 ℃ at the heating rate of 100 ℃/h, preserving the heat for 2h, air-cooling to room temperature, and performing tissue ultrafine treatment; heating to 860 deg.C at a heating rate of 100 deg.C/h, maintaining for 1h, and oil quenching to room temperature at 25 deg.C; then tempering and preserving heat for 2h at 620 ℃, and cooling to room temperature in air; the tempered samples were finished into a standard tensile sample and a rockwell hardness test sample, respectively, and their strength and hardness values were measured at room temperature and compared with the performance difference of the conventional 718H die steel (see table 1, table 2, fig. 1 and fig. 2). The chemical components of the conventional 718H die steel are as follows: 0.34 wt.% of C, 0.31 wt.% of Si, 1.53 wt.% of Mn, 2.02 wt.% of Cr, 0.19 wt.% of Mo, 1.03 wt.% of Ni, 0.01 wt.% of the total amount of Ce and La (mass fraction ratio of Ce to La element is 7: 3), 0.008 wt.% of P, 0.004 wt.% of S, and the balance of Fe, the total amount being 100 wt.%. The forging and heat treatment processes of the conventional 718H die steel are the same as those of the embodiment (0.1V-718H steel).
TABLE 1 Performance results for the 0.1V-718H die steel of this example
TABLE 2718H die steel performance results
Example 2
In this example, a microalloyed high strength and high hardness pre-hardened plastic mold steel and a method for preparing the same were determined, wherein:
the high-strength high-hardness pre-hardened plastic die steel comprises the following components in percentage by mass: c0.34 wt.%, Si 0.31 wt.%, Mn 1.51 wt.%, Cr 2.02 wt.%, Mo 0.18 wt.%, Ni 1.05 wt.%, V0.2 wt.%, the total amount of Ce and La is 0.012 wt.% (mass fraction ratio of Ce to La element is 7: 3), P0.007 wt.%, S0.002 wt.%, the remainder is Fe element, the total amount is 100 wt.%.
The materials are mixed according to the mass ratio of the chemical components, and 25kg of vacuum induction smelting furnace is used for smelting the materials into steel ingots. The ingot obtained was then heated to 1150 ℃ at a rate of 100 ℃/h and was then fully fired before forging, the finish forging temperature being 950 ℃ and the final dimensions 65mm x 720 mm. Heating the steel to be heat-treated to 870 ℃ at the heating rate of 100 ℃/h, preserving the heat for 2h, air-cooling to room temperature, and performing tissue ultrafine treatment; heating to 860 deg.C at a heating rate of 100 deg.C/h, maintaining for 1h, and oil quenching to room temperature at 25 deg.C; then tempering and preserving heat for 2h at 620 ℃, and cooling to room temperature in air; the tempered samples were finished into a standard tensile sample and a rockwell hardness test sample, respectively, and their strength values and hardness values were measured at room temperature, and the differences in properties from the conventional 718H die steel were compared (see table 2, table 3, fig. 1, and fig. 2). The chemical components of the conventional 718H die steel are as follows: 0.34 wt.% C, 0.31 wt.% Si, 1.53 wt.% Mn, 2.02 wt.% Cr, 1.03 wt.% Ni, 0.19 wt.% Mo, 0.01 wt.% of the total amount of Ce and La (mass fraction ratio of Ce to La element is 7: 3), 0.008 wt.% P, 0.004 wt.% S, and the balance Fe, the total amount being 100 wt.%. The forging and heat treatment processes of the conventional 718H die steel are the same as those of the embodiment (0.2V-718H steel).
TABLE 30.2 Performance results for V-718H die steels
Example 3
In this example, a microalloyed high strength and high hardness pre-hardened plastic mold steel and a method for preparing the same were determined, wherein:
the high-strength high-hardness pre-hardened plastic die steel comprises the following components in percentage by mass: c0.35 wt.%, Si 0.33 wt.%, Mn 1.53 wt.%, Cr 2.02 wt.%, Mo 0.19 wt.%, Ni 1.03 wt.%, V0.3 wt.%, the total amount of Ce and La is 0.01 wt.% (mass fraction ratio of Ce to La element is 7: 3), P0.005 wt.%, S0.003 wt.%, the remainder being Fe elements, the total amount being 100 wt.%.
The materials are mixed according to the mass ratio of the chemical components, and 25kg of vacuum induction smelting furnace is used for smelting the materials into steel ingots. The ingot obtained was then heated to 1150 ℃ at a rate of 100 ℃/h and was then fully fired before forging, the finish forging temperature being 950 ℃ and the final dimensions 65mm x 720 mm. Heating the steel to be heat-treated to 870 ℃ at the heating rate of 100 ℃/h, preserving the heat for 2h, air-cooling to room temperature, and performing tissue ultrafine treatment; heating to 860 deg.C at a heating rate of 100 deg.C/h, maintaining for 1h, and oil quenching to room temperature at 25 deg.C; then tempering and preserving heat for 2h at 620 ℃, and cooling to room temperature in air; the tempered samples were finished into a standard tensile sample and a rockwell hardness test sample, respectively, and their strength values and hardness values were measured at room temperature, and the differences in properties from the conventional 718H die steel were compared (see table 2, table 4, fig. 1, and fig. 2). The chemical components of the conventional 718H die steel are as follows: 0.34 wt.% C, 0.31 wt.% Si, 1.53 wt.% Mn, 2.02 wt.% Cr, 1.03 wt.% Ni, 0.19 wt.% Mo, 0.01 wt.% of the total amount of Ce and La (mass fraction ratio of Ce to La element is 7: 3), 0.008 wt.% P, 0.004 wt.% S, and the balance Fe, the total amount being 100 wt.%. The forging and heat treatment processes of the conventional 718H die steel are the same as those of the embodiment (0.3V-718H steel).
TABLE 40.3 Performance results for V-718H die steels
The results of the examples show that the microalloyed high-strength high-hardness pre-hard plastic die steel determined in the example can obtain higher room temperature strength and hardness value than the conventional 718H pre-hard plastic die steel under the condition of the tempering temperature of 620 ℃ in the manner. And the high hardness can obtain better mirror polishing property, thereby comprehensively improving the social and economic benefits of the die steel. The V element microalloyed pre-hardened plastic die steel can be used for important key plastic dies.
Claims (4)
1. A microalloyed high-strength high-hardness pre-hardened plastic die steel is characterized by comprising the following chemical components in percentage by mass: 0.30-0.35 wt.% of C, 0.30-0.35 wt.% of Si, 1.50wt.% of Mn1.55 wt.%, 1.90-2.10 wt.% of Cr, 0.15-0.25 wt.% of Mo, 0.90-1.10 wt.% of Ni, 0.10-0.30 wt.% of V, the total amount of Ce and La is less than or equal to 0.02 wt.%, P is less than or equal to 0.01 wt.%, S is less than or equal to 0.01 wt.%, and the balance is Fe.
2. The microalloyed high strength high hardness pre-hard plastic mold steel in accordance with claim 1, wherein the total amount of Ce and La is 0.01-0.02 wt.%.
3. The method for preparing microalloyed high-strength high-hardness pre-hardened plastic die steel as claimed in claim 1, which comprises the steps of smelting, forging and performance heat treatment, and is characterized by comprising the following specific steps:
(1) smelting: vacuum induction melting → vacuum degassing treatment to ensure the purity of molten steel; after vacuum degassing, adding rare earth alloy with the purity of more than 99.99 wt.% for final deoxidation and impurity change refining treatment, finally meeting the chemical component requirement of the pre-hard plastic die steel, and pouring a steel ingot of the pre-hard plastic die steel;
(2) forging: carrying out three-dimensional forging treatment on the steel ingot of the pre-hardened plastic die steel meeting the composition requirements, wherein the forging temperature is controlled to be 950-1150 ℃;
(3) normalizing: after forging the steel ingot, normalizing at 870 +/-20 ℃ for 1-5 h, air-cooling, and performing tissue normalizing superfine treatment;
(4) modulation heat treatment: after normalizing and superfine treatment, heating to 860 +/-20 ℃ at the heating rate of 80-120 ℃/h, preserving heat for 1-5 h, and then cooling to room temperature through oil quenching; the tempering temperature is 600-650 ℃, and the temperature is kept for 2-5 h and then the air cooling is carried out to the room temperature.
4. The method for preparing microalloyed high-strength and high-hardness pre-hardened plastic die steel according to claim 3, wherein the standard tensile sample size of the pre-hardened plastic die steel is in accordance with national standard GB/T228-2002, and 5-15 points are selected for each hardness test sample to carry out average Rockwell hardness test.
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