CN110343963B - Hot work die steel and preparation method thereof - Google Patents
Hot work die steel and preparation method thereof Download PDFInfo
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- CN110343963B CN110343963B CN201910691054.XA CN201910691054A CN110343963B CN 110343963 B CN110343963 B CN 110343963B CN 201910691054 A CN201910691054 A CN 201910691054A CN 110343963 B CN110343963 B CN 110343963B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention discloses hot work die steel and a preparation method thereof, wherein the hot work die steel consists of the following components: 0.396-0.397wt% of carbon, 0.975-1.03wt% of silicon, 0.427-0.514wt% of manganese, 1.55-1.59wt% of molybdenum, 4.94-5.10wt% of chromium, 0.984-1.04wt% of vanadium, 0.044-0.127wt% of titanium, and the balance of iron and inevitable impurities. According to the hot work die steel, the Ti element is added on the basis of the H13 steel, so that on one hand, the effects of controlling the grain size, preventing the grains from being excessively increased and increasing precipitation strengthening and fine grain strengthening are achieved, and the strength and hardness of the steel are improved; on the other hand, the titanium and carbon react to generate titanium carbide, which has the advantages of high hardness and good thermal stability, plays a role in precipitation strengthening and forms micro Ti alloying. The hot work die steel has obviously improved room temperature Rockwell hardness, room temperature tensile strength, room temperature tensile section shrinkage, high temperature tensile section shrinkage and high temperature tensile strength, and obviously enhanced comprehensive mechanical properties.
Description
Technical Field
The application relates to the technical field of new materials, in particular to hot work die steel and a preparation method thereof.
Background
The hot working die is a tool for manufacturing a required product from heated metal or liquid metal, such as a hot forging die, a hot heading die, a hot extrusion die, a die casting die, a high-speed forming die and the like, and various hot working dies work at a higher temperature, particularly the temperature of steel is 1200-1500 ℃ in hot extrusion of steel and die casting of steel, so that the main performance requirements of the hot working die steel are the heat resistance of the steel, and the toughness and the cold and hot fatigue resistance are the following. Various types of die steels used for hot-work dies are collectively called hot-work die steels.
The H13 steel is a common steel grade of hot work die steel, is mainly used for die casting dies, hot forging dies and hot extrusion dies, accounts for more than 50% of the total output of the hot work die steel, and has good hardenability, red hardness, wear resistance and excellent hot cracking resistance, and the grade is 4Cr5MoSiV 1. H13 steel is widely used as steel for aluminum extrusion dies because of its high cost performance and good processing property. However, the H13 steel has the following disadvantages: the heat treatment deformation rate is low, the reduction of area is low, the tensile strength is low, and the hardness is rapidly reduced when the use temperature is higher than 540 ℃. Therefore, the hot work die prepared by H13 steel can generate plastic deformation, cracking, dull grinding, washboard patterns, thermal abrasion and the like during use.
Disclosure of Invention
The first purpose of the invention is to provide hot work die steel with good high-temperature performance, in particular to hot work die steel with high reduction of area and high-temperature tensile strength.
The second purpose of the invention is to provide a preparation method of the hot-work die steel.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a hot work die steel consists of the following components: 0.396-0.397wt% of carbon, 0.975-1.03wt% of silicon, 0.427-0.514wt% of manganese, 1.55-1.59wt% of molybdenum, 4.94-5.10wt% of chromium, 0.984-1.04wt% of vanadium, 0.044-0.127wt% of titanium, and the balance of iron and inevitable impurities.
According to the hot work die steel, the titanium element is added on the basis of the H13 steel, so that on one hand, the effects of controlling the grain size, preventing the grains from being excessively increased and increasing precipitation strengthening and fine grain strengthening are achieved, and the strength and hardness of the steel are improved; on the other hand, the added titanium element forms micro titanium alloying, titanium reacts with carbon to generate titanium carbide which plays a role of precipitation strengthening, so that the hardness and the thermal stability of the hot work die steel are increased, the titanium, the vanadium and the carbon react to generate MC type carbide, and the MC type carbide with good stability is favorable for preventing the hardness reduction in the material thermal cycle and delaying M23C6The growth of the carbide can improve the high-temperature stability of the die steel and improve the thermal fatigue resistance of the die steel.
The hot-work die steel has the advantages that the room-temperature Rockwell hardness, the room-temperature tensile strength, the room-temperature tensile section shrinkage, the high-temperature tensile section shrinkage and the high-temperature tensile strength are all remarkably improved, the comprehensive mechanical property is remarkably enhanced, the room-temperature hardness reaches 51.0 HRC-51.9 HRC, the tensile strength reaches 1755 MPa-1803 MPa, and the section shrinkage reaches 40.0% -46.4%; the tensile strength at high temperature (450 ℃) reaches 1512MPa to 1531MPa, and the reduction of area at high temperature (450 ℃) reaches 49.0 percent to 50.0 percent.
In order to further improve the reduction of area and the tensile strength of the hot work die steel, it is preferable that the inevitable impurities include sulfur, phosphorus, nitrogen and oxygen.
In order to further improve the reduction of area and the tensile strength of the hot-work die steel, preferably, the content of the sulfur element is less than or equal to 0.0037wt%, the content of the phosphorus element is less than or equal to 0.0064wt%, the content of the nitrogen element is less than or equal to 0.0044wt%, and the content of the oxygen element is less than or equal to 20 ppm.
In order to further improve the fine-grain strengthening effect and the precipitation strengthening effect, it is preferable that the sum of 3.4 times of the content of the nitrogen element and 3 times of the content of the sulfur element is less than the content of the titanium element.
A preparation method of hot-work die steel comprises the following steps:
(1) selecting raw materials including iron, a silicon-containing raw material, a manganese-containing raw material, molybdenum, chromium, ferrovanadium and titanium according to the weight percentage of each component element in the hot-work die steel, and smelting at 1570-1650 ℃ in a protective atmosphere to obtain a melt; the silicon-containing raw material is silicon or ferrosilicon; the manganese-containing raw material is manganese or ferromanganese;
(2) preserving the temperature of the melt at 1570-1650 ℃ for 2.5-3 h, and carrying out vacuum die-casting forming to obtain a casting;
(3) forging and annealing the casting to obtain a forged annealed part;
(4) and quenching and tempering the annealed piece to obtain the product.
According to the preparation method of the hot work die steel, the raw materials with specific compositions are selected, the specific smelting temperature is 1570-1650 ℃, and smelting is carried out in a protective atmosphere, so that oxidation of silicon-containing raw materials, manganese-containing raw materials, molybdenum, chromium, ferrovanadium and titanium is reduced; the preparation method of the hot die steel is simplified, the obtained hot die steel has proper crystal phase, and the room-temperature Rockwell hardness, room-temperature tensile strength, room-temperature tensile reduction of area, high-temperature tensile reduction of area and high-temperature tensile strength of the hot die steel are improved.
In order to further remove impurities in the hot-work die steel, preferably, the raw material iron is subjected to vacuum smelting at 1570-1650 ℃ in the step (1) before smelting in a protective atmosphere.
In order to further optimize the composition structure of the crystalline phase in the hot working die, the forging ratio of the forging in the step (3) is preferably 7-8.
In order to further reduce the stress in the hot working die, preferably, the annealing in the step (3) is heat preservation for 6-7 hours at 900-950 ℃, and the annealing is carried out after the temperature is reduced from 900-950 ℃ to 500-550 ℃ and then the annealing is discharged for air cooling.
In order to further improve the hardness of the hot working die, the temperature of the quenching in the step (4) is preferably 1040-1050 ℃, and the time of the heat preservation is 25-30 min.
In order to further reduce the stress in the hot working die, preferably, the tempering in the step (4) is secondary tempering, the heat preservation temperature of the primary tempering is 580-600 ℃, the heat preservation time of the primary tempering is 2 hours, the heat preservation temperature of the secondary tempering is 580-600 ℃, and the heat preservation time of the secondary tempering is 2 hours.
Preferably, the protective atmosphere is one or more of argon, nitrogen and helium.
Preferably, the pressure of the protective atmosphere is 20000 Pa.
Detailed Description
The following examples are provided to further illustrate the practice of the invention. In the following examples, industrial pure iron rods, electrolytic manganese, ferromanganese, industrial silicon strips, ferrosilicon, industrial molybdenum strips, metallic chromium, ferrovanadium alloys, titanium sponge, melting, stirring, vacuum die casting, molding, forging, annealing, quenching, tempering and other equipment and raw materials can be obtained through conventional channels on the market.
Example 1 of the Hot work die Steel of the invention
The hot work die steel of the embodiment is composed of the following components: 0.397wt% of carbon, 1.03wt% of silicon, 0.514wt% of manganese, 1.59wt% of molybdenum, 4.94 wt% of chromium, 1.04wt% of vanadium, 0.044 wt% of titanium, and the balance of iron and inevitable impurities.
Example 2 of the Hot work die Steel of the invention
The hot work die steel of the embodiment is composed of the following components: 0.396 wt% of carbon, 0.975 wt% of silicon, 0.427 wt% of manganese, 1.55 wt% of molybdenum, 5.10wt% of chromium, 0.984 wt% of vanadium, 0.127wt% of titanium, and the balance of iron and inevitable impurities.
Method for producing Hot die Steel of the invention example 1
The preparation method of the hot work die steel comprises the following steps:
(1) the hot work die steel consists of the following components: 0.397wt% of carbon, 1.03wt% of silicon, 0.514wt% of manganese, 1.59wt% of molybdenum, 4.94 wt% of chromium, 1.04wt% of vanadium, 0.044 wt% of titanium, and the balance of iron and inevitable impurities; selecting raw materials of industrial pure iron bars, industrial silicon bars, electrolytic manganese, industrial molybdenum bars, metal chromium, ferrovanadium and sponge titanium according to the weight percentage of each component element in the hot-work die steel; adding an industrial pure iron rod into an aluminum-magnesium crucible, powering on and heating to start smelting, wherein the smelting temperature is 1570 ℃, keeping the vacuum degree of the whole smelting process below 10Pa, introducing argon gas when the industrial pure iron rod is completely molten, wherein the pressure of the argon gas is 20000Pa, adding industrial silicon strips, electrolytic manganese, industrial molybdenum strips, metal chromium, ferrovanadium and sponge titanium, and stirring to obtain a rough smelting melt; adding a refining agent into the uniformly mixed rough smelting melt, standing for 20min, and removing the molten slag to obtain a melt;
(2) heating the melt in the step (1) to 1570 ℃, preserving heat for 2.5h, then performing vacuum die-casting into a mold, keeping the pressure for 2s, and removing the mold to obtain a casting; the casting mould is made of cast iron;
(3) forging and annealing the casting to obtain a forged annealed part; the forging ratio of forging is 7; annealing, namely keeping the temperature at 900 ℃ for 6h, cooling from 900 ℃ to 500 ℃, discharging and air cooling;
(4) quenching and tempering: quenching and tempering the annealed piece after forging to obtain hot work die steel; the heat preservation temperature of quenching is 1040 ℃, and the heat preservation time is 25 min; the tempering is secondary tempering, the heat preservation temperature of the primary tempering is 580 ℃, the heat preservation time of the primary tempering is 2 hours, the heat preservation temperature of the secondary tempering is 600 ℃, and the heat preservation time of the secondary tempering is 2 hours.
Method for producing Hot die Steel of the invention example 2
The preparation method of the hot work die steel comprises the following steps:
(1) the hot work die steel consists of the following components: 0.396 wt% of carbon, 0.975 wt% of silicon, 0.427 wt% of manganese, 1.55 wt% of molybdenum, 5.10wt% of chromium, 0.984 wt% of vanadium, 0.127wt% of titanium, and the balance of iron and inevitable impurities; selecting raw materials of industrial pure iron rods, ferrosilicon, ferromanganese, industrial molybdenum strips, chromium metal, ferrovanadium and sponge titanium according to the weight percentage of each component element in the hot-work die steel; adding an industrial pure iron rod into an aluminum-magnesium crucible, powering on and heating to start smelting, wherein the smelting temperature is 1650 ℃, keeping the vacuum degree of the whole smelting process below 10Pa, introducing argon gas when the industrial pure iron rod is completely molten, wherein the pressure of the argon gas is 20000Pa, adding ferrosilicon, ferromanganese, industrial molybdenum strips, metal chromium, ferrovanadium and sponge titanium, and stirring to obtain a rough smelting melt; adding a refining agent into the uniformly mixed rough smelting melt, standing for 20min, and removing the molten slag to obtain a melt;
(2) heating the melt in the step (1) to 1650 ℃, preserving heat for 3h, then performing vacuum compression casting into a mould, keeping the pressure for 2s, and removing the mould to obtain a casting; the casting mould is made of cast iron;
(3) forging and annealing the casting to obtain a forged annealed part; the forging ratio of forging is 8; annealing, namely keeping the temperature at 950 ℃ for 7h, cooling from 950 ℃ to 550 ℃, discharging from the furnace and air cooling;
(4) quenching and tempering: quenching and tempering the annealed piece after forging to obtain hot work die steel; the heat preservation temperature of quenching is 1050 ℃, and the heat preservation time is 30 min; the tempering is secondary tempering, the heat preservation temperature of the primary tempering is 600 ℃, the heat preservation time of the primary tempering is 2 hours, the heat preservation temperature of the secondary tempering is 580 ℃, and the heat preservation time of the secondary tempering is 2 hours.
Comparative example 1 preparation method of Hot work die Steel of the present invention
The preparation method of the hot-work die steel of the comparative example comprises the following steps:
(1) the hot work die steel consists of the following components: 0.381 wt% of carbon, 0.895 wt% of silicon, 0.334 wt% of manganese, 1.62 wt% of molybdenum, 5.11 wt% of chromium, 0.983 wt% of vanadium, and the balance of iron and inevitable impurities; selecting raw materials of industrial pure iron bars, industrial silicon bars, electrolytic manganese, industrial molybdenum bars, metal chromium and ferrovanadium according to the weight percentage of each component element in the hot-work die steel; adding an industrial pure iron rod into an aluminum-magnesium crucible, powering on and heating to start smelting, wherein the smelting temperature is 1570 ℃, keeping the vacuum degree of the whole smelting process below 10Pa, introducing argon when the iron rod is completely molten, wherein the pressure of the argon is 20000Pa, adding industrial silicon strips, electrolytic manganese, industrial molybdenum strips, metal chromium and ferrovanadium, and stirring to obtain a rough smelting melt; adding a refining agent into the uniformly mixed rough smelting melt, standing for 20min, and removing the molten slag to obtain a melt;
(2) heating the melt in the step (1) to 1570 ℃, preserving heat for 2.5h, then performing vacuum die-casting into a mold, keeping the pressure for 2s, and removing the mold to obtain a casting; the casting mould is made of cast iron;
(3) forging and annealing the casting to obtain a forged annealed part; the forging ratio of forging is 7; annealing, namely keeping the temperature at 900 ℃ for 6h, cooling from 900 ℃ to 500 ℃, discharging and air cooling;
(4) quenching and tempering: quenching and tempering the annealed piece after forging to obtain hot work die steel; the heat preservation temperature of quenching is 1040 ℃, and the heat preservation time is 25 min; the tempering is secondary tempering, the heat preservation temperature of the primary tempering is 580 ℃, the heat preservation time of the primary tempering is 2 hours, the heat preservation temperature of the secondary tempering is 600 ℃, and the heat preservation time of the secondary tempering is 2 hours.
Test example:
mechanical property test:
according to the national standard GB/T228-2010 part 1 of the tensile test of metal materials of the people's republic of China: room temperature test method the hot die steels prepared in the hot die steel preparation methods of examples 1 to 2 and comparative example 1 were processed into standard tensile specimens, and a room temperature tensile test and a high temperature (450 ℃) tensile test were carried out on a SHIMADZU AG-I250 KN universal tensile testing machine at a tensile rate of 1 mm/min. The hardness of the test specimens was measured using a model 200HRS-150 digital Rockwell hardness tester. The mechanical properties of the hot work die steels prepared in comparative example 1 and examples 1 to 2 are shown in table 1.
Table 1: method for producing Hot die Steel Hot die steels obtained in examples 1 to 2 and comparative example 1
Mechanical properties
The results show that: the hot work die steel prepared by the invention has higher room temperature Rockwell hardness, room temperature tensile strength and room temperature tensile reduction of area, higher high temperature (450 ℃) tensile strength and reduction of area, and obviously enhanced comprehensive mechanical property. Compared with the hot-work die steel in the comparative example 1, the hot-work die steel prepared in the example 2 has the advantages that the hardness and the tensile strength at room temperature are respectively improved by 4.7HRC and 258MPa, respectively reach 51.9HRC and 1803MPa, and the reduction of area is improved from 35.0% to 46.4%; the tensile strength reaches 1531MPa at high temperature (450 ℃), the tensile strength is improved by 192MPa, and the reduction of area is improved from 38.8% to 50.0%. The hot work die steel is particularly suitable for the field of hot extrusion dies with the requirements of high strength, high hardness and high reduction of area at room temperature and high temperature.
Claims (7)
1. The hot work die steel is characterized by comprising the following components: 0.396-0.397wt% of carbon, 0.975-1.03wt% of silicon, 0.427-0.514wt% of manganese, 1.55-1.59wt% of molybdenum, 4.94-5.10wt% of chromium, 0.984-1.04wt% of vanadium, 0.044-0.127wt% of titanium, and the balance of iron and inevitable impurities;
the preparation method of the hot work die steel comprises the following steps:
(1) selecting raw materials including iron, a silicon-containing raw material, a manganese-containing raw material, molybdenum, chromium, ferrovanadium and titanium according to the weight percentage of each component element in the hot-work die steel, and smelting at 1570-1650 ℃ in a protective atmosphere to obtain a melt; the silicon-containing raw material is silicon or ferrosilicon; the manganese-containing raw material is manganese or ferromanganese;
(2) preserving the temperature of the melt at 1570-1650 ℃ for 2.5-3 h, and carrying out vacuum die-casting forming to obtain a casting;
(3) forging and annealing the casting to obtain a forged annealed part; the forging ratio of the forging is 7-8; the annealing is that the temperature is kept at 900-950 ℃ for 6-7 h, the temperature is reduced from 900-950 ℃ to 500-550 ℃, and then the annealing is discharged from the furnace and air-cooled;
(4) quenching and tempering the annealed piece to obtain the finished product; the heat preservation temperature of quenching is 1040-1050 ℃, and the heat preservation time is 25-30 min.
2. The hot work die steel as claimed in claim 1, wherein the inevitable impurities include sulfur, phosphorus, nitrogen and oxygen.
3. The hot work die steel as claimed in claim 2, wherein the content of the sulfur element is 0.0037wt% or less, the content of the phosphorus element is 0.0064wt% or less, the content of the nitrogen element is 0.0044wt% or less, and the content of the oxygen element is 20ppm or less.
4. The hot-work die steel as claimed in claim 2, wherein the sum of 3.4 times the content of nitrogen element and 3 times the content of sulfur element is smaller than the content of titanium element.
5. A method for producing the hot work die steel according to claim 1, comprising the steps of:
(1) selecting raw materials including iron, a silicon-containing raw material, a manganese-containing raw material, molybdenum, chromium, ferrovanadium and titanium according to the weight percentage of each component element in the hot-work die steel, and smelting at 1570-1650 ℃ in a protective atmosphere to obtain a melt; the silicon-containing raw material is silicon or ferrosilicon; the manganese-containing raw material is manganese or ferromanganese;
(2) preserving the temperature of the melt at 1570-1650 ℃ for 2.5-3 h, and carrying out vacuum die-casting forming to obtain a casting;
(3) forging and annealing the casting to obtain a forged annealed part; the forging ratio of the forging is 7-8; the annealing is that the temperature is kept at 900-950 ℃ for 6-7 h, the temperature is reduced from 900-950 ℃ to 500-550 ℃, and then the annealing is discharged from the furnace and air-cooled;
(4) quenching and tempering the annealed piece to obtain the finished product; the heat preservation temperature of quenching is 1040-1050 ℃, and the heat preservation time is 25-30 min.
6. The method for preparing hot work die steel according to claim 5, wherein the raw material iron is vacuum smelted before being smelted at 1570-1650 ℃ under a protective atmosphere in the step (1).
7. The method for preparing hot work die steel according to claim 5, wherein the tempering in the step (4) is a secondary tempering, the heat preservation temperature of the first tempering is 580 to 600 ℃, the heat preservation time of the first tempering is 2 hours, the heat preservation temperature of the second tempering is 580 to 600 ℃, and the heat preservation time of the second tempering is 2 hours.
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| US5207843A (en) * | 1991-07-31 | 1993-05-04 | Latrobe Steel Company | Chromium hot work steel |
| CN1727512A (en) * | 2004-07-29 | 2006-02-01 | 宝山钢铁股份有限公司 | Bainite die steel in large section for plastic and preparation method |
| CN101096743A (en) * | 2006-06-27 | 2008-01-02 | 宝山钢铁股份有限公司 | Super-thick non-hardening plastic mold steel and method for manufacturing the same |
| CN101709423A (en) * | 2009-11-17 | 2010-05-19 | 北京科技大学 | Method for improving properties of H13 die steel by adding nitrogen |
| CN102534391A (en) * | 2012-01-17 | 2012-07-04 | 武汉科技大学 | Hot-work die steel for extrusion wheel and manufacturing method thereof |
-
2019
- 2019-07-29 CN CN201910691054.XA patent/CN110343963B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5207843A (en) * | 1991-07-31 | 1993-05-04 | Latrobe Steel Company | Chromium hot work steel |
| CN1727512A (en) * | 2004-07-29 | 2006-02-01 | 宝山钢铁股份有限公司 | Bainite die steel in large section for plastic and preparation method |
| CN101096743A (en) * | 2006-06-27 | 2008-01-02 | 宝山钢铁股份有限公司 | Super-thick non-hardening plastic mold steel and method for manufacturing the same |
| CN101709423A (en) * | 2009-11-17 | 2010-05-19 | 北京科技大学 | Method for improving properties of H13 die steel by adding nitrogen |
| CN102534391A (en) * | 2012-01-17 | 2012-07-04 | 武汉科技大学 | Hot-work die steel for extrusion wheel and manufacturing method thereof |
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