CN105886933B - Hot work die steel with high tempering softening resistance and high toughness and manufacturing method thereof - Google Patents
Hot work die steel with high tempering softening resistance and high toughness and manufacturing method thereof Download PDFInfo
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C21D1/32—Soft annealing, e.g. spheroidising
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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
- C21D6/004—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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- 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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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention discloses a hot work die steel with high tempering softening resistance and high toughness and a manufacturing method thereof, wherein the hot work die steel comprises the following chemical components in percentage by weight: 0.35 to 0.45 percent of C, 0.15 to 0.35 percent of Si, 0.5 to 0.7 percent of Mn, 4.5 to 5.0 percent of Cr, 1.5 to 1.9 percent of Mo, 0.2 to 0.5 percent of V, 0.1 to 0.2 percent of Ni, 0.002 to 0.012 percent of P, 0.0001 to 0.0005 percent of S, 0.003 to 0.009 percent of rare earth and the balance of Fe, and comprises the following steps: s1: refining in an intermediate frequency furnace and an LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.002-0.012%, then the alloy composition is adjusted and the sulfur is removed through LF refining, and the S is controlled to be 0.001-0.003%; s2: VD degassing and rare earth addition: controlling the oxygen content in the steel to be 10-20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel to be 0.003-0.009%; s3: pouring under the protection of argon: the casting is carried out under the protection of argon gas, and oxygen dissolved in the atmosphere in the steel is prevented. The invention has higher tempering softening resistance and higher toughness, the service life of the invention is improved by 1.5-2.0 times compared with H13, the use efficiency of the die is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of hot-work die steel, in particular to hot-work die steel with high tempering softening resistance and high toughness and a manufacturing method thereof.
Background
The part machined and molded by the die has a series of advantages of high production efficiency, good quality, material saving, low cost and the like, and has wide application range; when the hot working die is used, the hot working die is contacted with high-temperature metal (liquid or solid), and bears mechanical force, friction force, alternating thermal stress and mechanical stress, so that the die is easy to generate failure modes such as fracture, plastic deformation, abrasion, softening, fatigue and the like, and the hot working die is required to have excellent strength, toughness, plasticity, wear resistance and tempering softening resistance, wherein the special toughness and the tempering softening resistance are particularly important according to the use experience of each die factory.
H13 is one of the most commonly used hot forging die steels, was originally developed by the United states in the first half of the last century, and has the characteristics of excellent hardenability, good toughness, high wear resistance, good thermal fatigue and the like, so that the comprehensive performance of H13 is very outstanding in hot working die steel, and therefore, the H13 quickly becomes the mainstream hot working die steel in the world; the H13 steel is mainly characterized in that: (1) has high hardenability and high toughness; (2) the excellent hot cracking resistance can be realized, and water cooling can be performed on the working occasions; (3) the wear-resistant alloy has medium wear-resistant capability, and the surface hardness of the alloy can be improved by adopting a carburizing or nitriding process, but the hot cracking resistance is slightly reduced; (4) because the carbon content is lower, the secondary hardening capacity in tempering is poorer; (5) the softening resistance is realized at higher temperature, but the hardness is rapidly reduced (namely the durable working temperature is 540 ℃) when the use temperature is higher than 540 ℃ (1000 DEG F); (6) the deformation of heat treatment is small; (7) medium and high machinability; (8) moderate decarburization resistance.
With the common application of high-speed, high-load and high-precision die forging equipment and high-strength and high-toughness forgings, the service conditions of a hot working die are worse, and H13 causes various failure modes due to various reasons in the production process, so that the invention provides the hot working die steel with high tempering softening resistance and high toughness and the manufacturing method thereof.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides hot work die steel with high tempering softening resistance and high toughness and a manufacturing method thereof.
The invention provides hot work die steel with high tempering softening resistance and high toughness, which comprises the following chemical components in percentage by weight: 0.35 to 0.45 percent of C, 0.15 to 0.35 percent of Si, 0.5 to 0.7 percent of Mn, 4.5 to 5.0 percent of Cr, 1.5 to 1.9 percent of Mo, 0.2 to 0.5 percent of V, 0.1 to 0.2 percent of Ni, 0.002 to 0.012 percent of P, 0.0001 to 0.0005 percent of S, 0.003 to 0.009 percent of rare earth and the balance of Fe.
Preferably, the paint comprises the following chemical component contents in percentage by weight: 0.40 to 0.45 percent of C, 0.25 to 0.35 percent of Si, 0.6 to 0.7 percent of Mn, 4.8 to 5.0 percent of Cr, 1.7 to 1.9 percent of Mo, 0.3 to 0.5 percent of V, 0.15 to 0.2 percent of Ni, 0.008 to 0.012 percent of P, 0.0003 to 0.0005 percent of S, 0.005 to 0.009 percent of rare earth and the balance of Fe.
Preferably, the steel grade has an oxygen content of 5-10 ppm.
The invention also provides a manufacturing method of the hot work die steel with high tempering softening resistance and high toughness, which comprises the following steps:
s1: refining in an intermediate frequency furnace and an LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.002-0.012%, then the alloy composition is adjusted and the sulfur is removed through LF refining, and the S is controlled to be 0.001-0.003%;
s2: VD degassing and rare earth addition: controlling the oxygen content in the steel to be 10-20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel to be 0.003-0.009%;
s3: pouring under the protection of argon: pouring under the protection of argon to prevent oxygen dissolved into the atmosphere in the steel;
s4: atmosphere protection electroslag: remelting the steel ingot by an atmosphere protection electroslag technology, improving the purity of steel, reducing the oxygen and sulfur content to 3-5ppm, and improving the solidification condition of the steel, thereby reducing and improving the compactness and the tissue uniformity of the steel ingot;
s5: high-temperature diffusion: carrying out high-temperature diffusion on the steel ingot at the temperature of 1240-1280 ℃, wherein the heat preservation time is 12-30 hours;
s6: six-surface forging: six-sided forging is carried out on the steel ingot, the heat preservation is carried out for 2-2.5 hours at the temperature of 1200-1300 ℃, the open forging is carried out at the temperature of 1150-1250 ℃, and the finish forging temperature is 800-1000 ℃;
s7: fine grain heat treatment technology: preserving the temperature of the forged steel ingot at 1100-1200 ℃ for 5-30 hours, and then carrying out mist cooling to 400-600 ℃ to eliminate secondary carbide precipitation along the grain boundary;
s8: spheroidizing annealing: charging at 500 ℃ of 300-.
Preferably, in S1, the refining in the intermediate frequency furnace and the LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.008-0.012%, then the alloy components are adjusted and the desulphurization is carried out through LF refining, and the S is controlled to be 0.002-0.003%.
Preferably, in S2, VD is degassed and rare earth is added: controlling the oxygen content in the steel to be 15-20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel to be 0.005-0.009%.
Preferably, in S6, six-sided forging: six-sided forging is carried out on the steel ingot, the temperature is kept for 2-2.3 hours at 1250-.
Preferably, in S7, the fine crystal heat treatment technique: and (3) preserving the temperature of the forged steel ingot at 1150-1200 ℃ for 10-30 hours, and then carrying out mist cooling to 500-600 ℃ to eliminate the precipitation of secondary carbides along grain boundaries.
Preferably, in S8, spheroidizing annealing: charging at 400-870 deg.C for 10-15 h, slowly cooling at 22-25 deg.C to 730-750 deg.C for 25-35 h, slowly cooling at 22-25 deg.C to 500-600 deg.C, and air cooling.
According to the invention, the hot-work die steel which is pure in matrix, uniform in structure and free of large primary carbides can be obtained by using the technical scheme, compared with H13 steel, the hot-work die steel has higher tempering softening resistance and higher toughness, the service life of the hot-work die steel is prolonged by 1.5-2.0 times compared with H13, the use efficiency of a die is improved, the production cost is reduced, steel carbides can be spheroidized, the size of the steel carbides is proper, and the hot-work die steel is convenient to machine, and the contents of silicon and vanadium are reduced on the basis of H13 steel so as to improve the toughness of the material; the molybdenum content is increased, the strength loss of the steel after the silicon and vanadium are reduced is compensated, and the tempering softening resistance of the steel is improved; adding nickel to compensate for partial effect of reducing Si and improve the toughness of the steel; the addition of rare earth can improve the purity, uniformity and grain refinement of steel, improve the thermoplasticity of high alloy steel and the like, and also make up part of the effects of vanadium.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The embodiment provides a hot-work die steel with high temper softening resistance and high toughness, which comprises the following chemical components in percentage by weight: 0.35% of C, 0.15% of Si, 0.5% of Mn, 4.5% of Cr, 1.5% of Mo, 0.2% of V, 0.1% of Ni, 0.002% of P, 0.0001% of S, 0.003% of rare earth and the balance of Fe.
The embodiment also provides a method for manufacturing the hot-work die steel with high temper softening resistance and high toughness, which comprises the following steps:
s1: refining in an intermediate frequency furnace and an LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.002 percent, then the alloy components are adjusted and the desulphurization is carried out through LF refining, and the S is controlled to be 0.001 percent;
s2: VD degassing and rare earth addition: controlling the oxygen content in steel to be 10ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of steel grade to be 0.003%;
s3: pouring under the protection of argon: pouring under the protection of argon to prevent oxygen dissolved into the atmosphere in the steel;
s4: atmosphere protection electroslag: remelting the steel ingot by an atmosphere protection electroslag technology, improving the purity of steel, reducing the oxygen and sulfur content to 3ppm, and improving the solidification condition of the steel, thereby reducing the compactness and the tissue uniformity of the steel ingot;
s5: high-temperature diffusion: carrying out high-temperature diffusion on the steel ingot at 1240 ℃ for 12 hours;
s6: six-surface forging: six-side forging is carried out on the steel ingot, the temperature is kept for 2 hours at 1200 ℃, open forging is carried out at 1150 ℃, and the finish forging temperature is 800 ℃;
s7: fine grain heat treatment technology: preserving the temperature of the forged steel ingot at 1100 ℃ for 5 hours, and then carrying out mist cooling to 400 ℃ to eliminate secondary carbide precipitation along a grain boundary;
s8: spheroidizing annealing: charging at 300 deg.C, holding at 850 deg.C for 8 hr, slowly cooling at 20 deg.C to 700 deg.C, holding for 15 hr, slowly cooling at 20 deg.C to 400 deg.C, and air cooling.
Example two
The embodiment provides a hot-work die steel with high temper softening resistance and high toughness, which comprises the following chemical components in percentage by weight: 0.45% of C, 0.35% of Si, 0.7% of Mn, 5.0% of Cr, 1.9% of Mo, 0.5% of V, 0.2% of Ni, 0.012% of P, 0.0005% of S, 0.009% of rare earth and the balance of Fe.
The embodiment also provides a method for manufacturing the hot-work die steel with high temper softening resistance and high toughness, which comprises the following steps:
s1: refining in an intermediate frequency furnace and an LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.012 percent, then the alloy components are adjusted and the desulphurization is carried out through LF refining, and the S is controlled to be 0.003 percent;
s2: VD degassing and rare earth addition: controlling the oxygen content in the steel to be 20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel grade to be 0.009%;
s3: pouring under the protection of argon: pouring under the protection of argon to prevent oxygen dissolved into the atmosphere in the steel;
s4: atmosphere protection electroslag: remelting the steel ingot by an atmosphere protection electroslag technology, improving the purity of steel, reducing the oxygen and sulfur content to 5ppm, and improving the solidification condition of the steel, thereby reducing the compactness and the tissue uniformity of the steel ingot;
s5: high-temperature diffusion: carrying out high-temperature diffusion on the steel ingot at 1280 ℃, and keeping the temperature for 30 hours;
s6: six-surface forging: six-side forging is carried out on the steel ingot, the temperature is kept at 1300 ℃ for 2.5 hours, open forging is carried out at 1250 ℃, and the finish forging temperature is 1000 ℃;
s7: fine grain heat treatment technology: preserving the temperature of the forged steel ingot at 1200 ℃ for 30 hours, and then carrying out mist cooling to 600 ℃ to eliminate secondary carbide precipitation along a grain boundary;
s8: spheroidizing annealing: charging the furnace at 500 ℃, then preserving heat for 15 hours at 870 ℃, slowly cooling at 25 ℃ to 750 ℃, preserving heat for 35 hours, slowly cooling at 25 ℃ to 600 ℃, discharging and air cooling.
In the examples, the content of the steel grade alloy is determined according to the action of the respective alloying elements:
carbon: carbon is one of the most important elements for improving the hardenability and the hardenability of the material, and alloy carbide can be formed to improve the wear resistance, but the addition amount is excessive, the quenching structure is high-carbon martensite, the brittleness is high, and therefore, the content of the carbon is controlled to be 0.35-0.45%.
Silicon: the addition of silicon into the steel grade has the deoxidation effect, and the silicon also enters a matrix to play a solid solution strengthening effect, so that the strength and the wear resistance of the steel are improved; since segregation is easily caused by an excessive amount of silicon added, the silicon content is controlled to 0.15 to 0.35%.
Manganese: manganese also increases the hardenability of steel, but too much manganese is added, and the residual austenite in the quenched structure is too much, which in turn decreases the H13 wear resistance.
Chromium: chromium is added into the steel mainly for improving high-temperature performance and ensuring stable structure and performance at high temperature, chromium is an element for reducing a gamma phase region, and the addition amount of chromium is too much, so that low-hardness ferrite is easy to appear in a quenching structure; moreover, chromium also increases the brittle transition temperature of steel and promotes the warm temper brittleness of steel, so the addition amount is controlled to be 4.5-5.0%.
Vanadium: v has great affinity with O, N, one is strong carbide element, VC has high dispersivity and is very stable; therefore, the alloy can be deoxidized and degassed to obtain a compact fine grain structure, and the plasticity, the toughness, the strength and the wear resistance are improved, but the carburization is not facilitated; the VC dispersion prevents the growth of weld grains, so that the welding performance can be improved; vanadium improves the high-temperature creep deformation and the endurance strength of steel, and improves the heat strength of steel; the solid solution in austenite can improve the hardenability of steel, the compound state can reduce the hardenability of steel, the tempering stability of steel is improved, and the solid solution has strong secondary hardening effect and strong solid solution strengthening effect when being dissolved in ferrite; however, too much vanadium content is added to increase the toughness and plasticity of the steel and make machining difficult. Therefore, the content of vanadium is controlled between 0.2 and 0.5 percent.
Molybdenum: molybdenum is added into the steel, mainly to improve the tempering resistance stability of the steel and eliminate the tempering brittleness of the steel; when the molybdenum content is more, 6 phases or other brittle phases are easy to appear to reduce the toughness, promote the decarburization and reduce the heat conductivity, so the molybdenum content is controlled to be 1.5-1.9 percent.
Ni: the nickel can improve the strength, hardenability, plasticity and toughness, improve the corrosion resistance of the steel, and is used together with Cr and Mo to improve the heat strength; however, too much nickel is added to easily enlarge the austenite phase region and increase the residual austenite content.
Rare earth: the rare earth is easy to combine with sulfur and oxygen in steel to generate high-melting-point rare earth oxide, rare earth sulfide, rare earth oxysulfide and rare earth silicate, and the substances can be used as non-white hair crystal cores in the solidification process of molten steel to promote the grain refinement in the steel; meanwhile, the rare earth element can change the form of alloy carbide Mn (Cr, w, V, Mo) C in the alloy die steel, so that the alloy carbide is changed into the form of dispersed granular or spherical carbide from needle-shaped, flaky and continuous net-shaped, thereby improving the structure and performance of the steel.
Sulfur: harmful elements; the strength and toughness of the steel are reduced; the sulfur content in the hot die steel is reduced as much as possible, and the sulfur content in the product is controlled below 5 ppm.
Phosphorus: harmful elements, which increase the brittle transition temperature of steel; the welding performance is deteriorated, the plasticity is reduced, the cold bending property is deteriorated, the tempering brittleness (tempering is separated along a grain boundary) is increased, and crystal grains are coarsened; the phosphorus content of the product is controlled below 0.012 percent.
The smelting process comprises the following steps: the alloy meets the component requirements by intermediate frequency furnace smelting, LF furnace refining, VD degassing, rare earth magnesium calcium composite wire feeding, argon protection pouring and protective atmosphere electroslag remelting.
High-temperature diffusion: and (3) carrying out high-temperature diffusion on the steel ingot at the temperature of 1240-1280 ℃, wherein the heat preservation time is 12-30 hours, and eliminating liquated carbides and interdendritic segregation in the solidification process.
The forging process comprises the following steps: six-side forging is carried out on the steel ingot, the temperature is kept for 2 hours at 1200-1300 ℃, the open forging is carried out at 1150-1250 ℃, and the finish forging temperature is more than 800 ℃.
Fine grain heat treatment technology: and (3) preserving the temperature of the forged steel billet at 1100-1200 ℃ for 5-30 hours, then carrying out mist cooling to 400-600 ℃, and immediately entering a furnace for spheroidizing annealing to eliminate the precipitation of secondary carbides along grain boundaries.
Spheroidizing annealing: charging at 500 ℃ under 300 ℃ and holding at 850-870 ℃ for 8-15 hours, slowly cooling at a cooling speed of less than 25 ℃ to 750 ℃ under 700 ℃ and holding for 15-35 hours, slowly cooling at a cooling speed of less than 25 ℃ to 600 ℃ under 400 ℃ and taking out of the furnace for air cooling.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The method for manufacturing the hot-work die steel with high temper softening resistance and high toughness is characterized in that the hot-work die steel with high temper softening resistance and high toughness comprises the following chemical component contents in percentage by weight: 0.35-0.45% of C, 0.15-0.35% of Si, 0.5-0.7% of Mn, 4.5-5.0% of Cr, 1.5-1.9% of Mo, 0.2-0.5% of V, 0.1-0.2% of Ni, 0.002-0.012% of P, 0.0001-0.0005% of S, 0.003-0.009% of rare earth and the balance of Fe;
the oxygen content of the hot work die steel with high tempering softening resistance and high toughness is 5-10 ppm;
the manufacturing method of the hot die steel with high temper softening resistance and high toughness comprises the following steps:
s1: refining in an intermediate frequency furnace and an LF furnace: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.002-0.012%, then the alloy composition is adjusted and the sulfur is removed through LF refining, and the S is controlled to be 0.001-0.003%;
s2: VD degassing and rare earth addition: controlling the oxygen content in the steel to be 10-20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel to be 0.003-0.009%;
s3: pouring under the protection of argon: pouring under the protection of argon to prevent oxygen dissolved into the atmosphere in the steel;
s4: atmosphere protection electroslag: remelting the steel ingot by an atmosphere protection electroslag technology, improving the purity of steel, reducing the oxygen and sulfur content to 3-5ppm, and improving the solidification condition of the steel, thereby reducing and improving the compactness and the tissue uniformity of the steel ingot;
s5: high-temperature diffusion: carrying out high-temperature diffusion on the steel ingot at 1280 ℃, and keeping the temperature for 30 hours;
s6: six-surface forging: six-side forging is carried out on the steel ingot, the temperature is kept at 1300 ℃ for 2.5 hours, open forging is carried out at 1250 ℃, and the finish forging temperature is 1000 ℃;
s7: fine grain heat treatment technology: preserving the temperature of the forged steel ingot at 1200 ℃ for 30 hours, and then carrying out mist cooling to 600 ℃ to eliminate secondary carbide precipitation along a grain boundary;
s8: spheroidizing annealing: charging at 500 deg.C under 300 deg.C, holding at 870 deg.C for 15 hr, slowly cooling at 25 deg.C to 750 deg.C, holding at 35 hr, slowly cooling at 25 deg.C to 600 deg.C, and air cooling.
2. The method for manufacturing a hot-work die steel with high temper softening resistance and high toughness as claimed in claim 1, wherein in S1, the intermediate frequency furnace and LF furnace refining: c, Si, Mn, Cr, Mo, V, Ni, P, S and Fe are put into an intermediate frequency furnace for smelting, the tapping P is controlled to be 0.008-0.012%, then the alloy components are adjusted and the desulphurization is carried out through LF refining, and the S is controlled to be 0.002-0.003%.
3. The method for manufacturing a hot-work die steel with high temper softening resistance and high toughness as claimed in claim 1, wherein in S2, VD degasses and rare earth addition: controlling the oxygen content in the steel to be 15-20ppm by a VD furnace, adding a rare earth composite wire in the VD furnace, and controlling the rare earth content of the steel to be 0.005-0.009%.
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| CN110699597A (en) * | 2018-07-10 | 2020-01-17 | 中国科学院金属研究所 | Hot work die steel and preparation method thereof |
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