CN111139338A - Heat treatment method of hot work die steel and hot work die steel - Google Patents
Heat treatment method of hot work die steel and hot work die steel Download PDFInfo
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- CN111139338A CN111139338A CN202010017542.5A CN202010017542A CN111139338A CN 111139338 A CN111139338 A CN 111139338A CN 202010017542 A CN202010017542 A CN 202010017542A CN 111139338 A CN111139338 A CN 111139338A
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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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Abstract
The invention discloses a heat treatment method of hot work die steel and the hot work die steel, and relates to the technical field of alloys. The heat treatment method of the hot work die steel comprises the following steps: step S10, heating the hot work die electroslag steel ingot to a first heating temperature, and flattening along the side surface; step S20, adjusting the temperature to be a second heating temperature, heating for 2-8 h, and then upsetting according to the upsetting ratio of 2.3-3.5; s30, changing the flattening direction to flatten the side face again, heating the side face for 3-6 hours at a third heating temperature, and upsetting the side face again according to the upsetting ratio of 2.3-3.5; step S40, repeating the steps S10-S30 at least once to obtain a treated hot work die electroslag steel ingot, and drawing the treated hot work die electroslag steel ingot to a specific size to obtain a primary hot work die steel product; step S50, quenching the primary hot work die steel product, and cooling to normal temperature to obtain the hot work die steel; the first heating temperature is 1260-1300 ℃, the second heating temperature is 1240-1280 ℃, and the third heating temperature is 1240-1280 ℃.
Description
Technical Field
The invention relates to the technical field of alloy, in particular to a heat treatment method of hot work die steel and the hot work die steel.
Background
The hot-working die steel comprises a hammer forging die, a hot extrusion die and a die-casting die. The working condition of the hot working die is mainly characterized in that the hot working die is contacted with hot metal, which is the main difference between the working conditions of the hot working die and the cold working die. Therefore, the hot work die steel is required to have high toughness and strength.
The existing heat treatment method of hot die steel generally adopts repeated forging, annealing and tempering at high temperature, but the method does not obviously improve the toughness and the strength of the hot die steel.
Disclosure of Invention
The invention mainly aims to provide a heat treatment method of hot die steel and the hot die steel, and aims to provide the heat treatment method of the hot die steel, so as to improve the toughness and strength of the hot die steel.
In order to achieve the purpose, the invention provides a heat treatment method of hot work die steel, which comprises the following steps:
step S10, heating the hot work die electroslag steel ingot to a first heating temperature, and flattening along the side surface;
step S20, adjusting the temperature to be a second heating temperature, heating for 2-8 h, and then upsetting according to the upsetting ratio of 2.3-3.5;
s30, changing the flattening direction to flatten the side face again, heating the side face for 3-6 hours at a third heating temperature, and upsetting the side face again according to the upsetting ratio of 2.3-3.5;
step S40, repeating the steps S10-S30 at least once to obtain a treated hot work die electroslag steel ingot, and drawing the treated hot work die electroslag steel ingot to a specific size to obtain a primary hot work die steel product;
step S50, quenching the primary hot work die steel product, and cooling to normal temperature to obtain the hot work die steel;
wherein the first heating temperature is 1260-1300 ℃, the second heating temperature is 1240-1280 ℃, and the third heating temperature is 1240-1280 ℃.
Optionally, in step S40, the steps S10 to S30 are repeated 10 to 50 times.
Optionally, in step S40, the quenching is any one of water cooling quenching, oil cooling quenching, and air cooling quenching.
Optionally, in step S40, the quenching is water cooling quenching.
Optionally, in step S10, the hot die electroslag ingot is flattened along the side to a length: width: height 1: (1.1-1.2): (2.2-2.5).
Optionally, in step S10, the first heating temperature is 1280 ℃.
Optionally, in step S10, the second heating temperature is 1260 ℃.
Optionally, in step S10, the third heating temperature is 1260 ℃.
The invention further provides the hot-work die steel which is prepared by adopting the heat treatment method of the hot-work die steel.
The invention provides a heat treatment method of hot work die steel, which comprises the steps of flattening a hot work die electroslag steel ingot along the side surface at 1260-1300 ℃, then preserving heat at 1240-1280 ℃ for 2-8 hours, upsetting according to the upsetting ratio of 2.3-3.5, changing the flattening direction to flatten along the side surface again, heating at 1240-1280 ℃ for 3-6 hours, upsetting again according to the upsetting ratio of 2.3-3.5, repeatedly flattening and upsetting in different directions and different positions of the steel ingot, and finally quenching and cooling to obtain the hot work die steel. Under the action of high temperature and plastic deformation, large blocky carbides can be crushed and refined, so that the structure of the hot die steel is homogenized and the grains are refined, the shaping and toughness of the material are improved, and the treated hot die steel has better hardenability, plastic toughness and tempering stability, and can be used for manufacturing high-strength and high-toughness die materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart showing an embodiment of a heat treatment method for hot work die steel according to the present invention;
FIG. 2 shows the microstructure of the hot work die steel obtained in example 1 of the present invention;
FIG. 3 shows the microstructure of the hot work die steel obtained in example 2 of the present invention;
FIG. 4 shows the microstructure of the hot work die steel obtained in example 3 of the present invention;
FIG. 5 shows the microstructure of the hot work die steel obtained in example 4 of the present invention;
FIG. 6 shows the microstructure of the hot work die steel obtained in example 5 of the present invention;
FIG. 7 shows the microstructure of the hot work die steel obtained in example 6 of the present invention;
FIG. 8 is a microstructure of a hot work die steel obtained in comparative example 1 of the present invention;
FIG. 9 shows the microstructure of the hot work die steel obtained in comparative example 2 of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing heat treatment method of hot die steel generally adopts repeated forging, annealing and tempering at high temperature, but the method does not obviously improve the toughness and the strength of the hot die steel.
In view of this, the present invention provides a heat treatment method for hot work die steel and hot work die steel, and aims to provide a heat treatment method for hot work die steel, which can improve the toughness and strength of hot work die steel.
Referring to fig. 1, the heat treatment method of hot die steel according to the present invention includes the following steps:
step S10, heating the hot work die electroslag steel ingot to a first heating temperature, and flattening along the side surface;
the first heating temperature is 1260-1300 ℃, specifically, the first heating temperature can be 1260 ℃, 1270 ℃, 1280 ℃, 1290 ℃, 1300 ℃, and the like, preferably 1280 ℃, and at this temperature, the dissolution of carbide in the hot work die electroslag steel ingot is facilitated, so that the hot work die electroslag steel ingot is further homogenized.
Furthermore, the invention is not limited with respect to the degree of flattening, and preferably, the hot work die electroslag ingot is flattened along the side to a length: width: height 1: (1.1-1.2): (2.2-2.5) is beneficial to the primary crushing of massive carbides in the center of the steel ingot, so that the massive carbides are easier to dissolve and diffuse during subsequent heating.
Step S20, adjusting the temperature to be a second heating temperature, heating for 2-8 h, and then upsetting according to the upsetting ratio of 2.3-3.5;
the second heating temperature is 1240-1280 ℃, specifically, the second heating temperature can be 1240 ℃, 1250 ℃, 1260 ℃, 1270 ℃, 1280 ℃ and the like, preferably 1260 ℃, and the crushed carbide is rapidly dissolved and diffused at high temperature, and in addition, the temperature is heated for 2-8 hours, so that the uniformity of material deformation in the subsequent treatment process is favorably improved.
Upsetting is a process of reducing the height of a billet by pressure and increasing the diameter (or transverse dimension), and is the most basic forming method in a plastic forming process. Upsetting enables metal at the end of the hot working die electroslag steel ingot to flow towards the periphery, and the side surface is concave inwards. Because the hot working die electroslag steel ingot is generated along the side surface by the compressive stress component, and the end surface has no difficult deformation area, the deformation is uniform, the tendency of generating cracks is obviously reduced, and the plasticity of the hot working die electroslag steel ingot is greatly improved.
It should be noted that the upset ratio herein is the ratio of the height of the material before upset to the height of the material after upset, e.g., the height of the material before upset is H0The height of the upset material is H, then, the upset ratio is H0and/H. Preferably, in the embodiment of the invention, the upsetting ratio is 2.3-3.5, and the upsetting ratio is more favorable for fully improving the structure property of the hot work die electroslag steel ingot.
S30, changing the flattening direction to flatten the side face again, heating the side face for 3-6 hours at a third heating temperature, and upsetting the side face again according to the upsetting ratio of 2.3-3.5;
the third heating temperature is 1240-1280 ℃, specifically, the third heating temperature can be 1240 ℃, 1250 ℃, 1260 ℃, 1270 ℃, 1280 ℃ and the like, and is preferably 1260 ℃.
Step S40, repeating the steps S10-S30 at least once to obtain a treated hot work die electroslag steel ingot, and drawing the treated hot work die electroslag steel ingot to a specific size to obtain a primary hot work die steel product;
the number of repetitions of steps S10 to S30 is not limited in the present invention, and preferably, the number of repetitions of steps S10 to S30 is 10 to 50. The flattening and upsetting processes are repeated, and the flattening and upsetting are repeatedly performed in different directions and different positions of the steel ingot, so that massive carbides are favorably and fully crushed and refined, and the toughness and the strength of the hot die steel are further improved.
Step S50, quenching the primary hot work die steel product, and cooling to normal temperature to obtain the hot work die steel;
the quenching of steel is a heat treatment process of heating the steel to a temperature above a critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), preserving the heat for a period of time to make the steel fully or partially austenitized, and then rapidly cooling the steel to a temperature below Ms (or isothermal near Ms) at a cooling speed greater than a critical cooling speed to perform martensite (or bainite) transformation. The purpose of quenching is to transform the super-cooled austenite into martensite or bainite to obtain a martensite or bainite structure, and then to improve the hardness, wear resistance, fatigue strength, toughness and the like of the steel by tempering at different temperatures, thereby satisfying different use requirements of various mechanical parts and tools. In the embodiment of the invention, the quenching is any one of water cooling quenching, oil cooling quenching and air cooling quenching. Preferably, the quenching adopts water-cooling quenching, the operation is simple, the cost is reduced, the mechanization is easy to realize, and the application is wide.
The invention provides a heat treatment method of hot work die steel, which comprises the steps of flattening a hot work die electroslag steel ingot along the side surface at 1260-1300 ℃, then preserving heat at 1240-1280 ℃ for 2-8 hours, upsetting according to the upsetting ratio of 2.3-3.5, changing the flattening direction to flatten along the side surface again, heating at 1240-1280 ℃ for 3-6 hours, upsetting again according to the upsetting ratio of 2.3-3.5, repeatedly flattening and upsetting in different directions and different positions of the steel ingot, and finally quenching and cooling to obtain the hot work die steel. Under the action of high temperature and plastic deformation, large blocky carbides can be crushed and refined, so that the structure of the hot die steel is homogenized and the grains are refined, the plasticity and toughness of the material are improved, and the treated hot die steel has better hardenability, plastic toughness and tempering stability and can be used for manufacturing high-strength and high-toughness die materials.
The invention further provides the hot-work die steel which is prepared by adopting the heat treatment method of the hot-work die steel. The hot work die steel has high toughness and strength.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
Heating the hot work die electroslag steel ingot to 1280 ℃, flattening along the side surface to length: width: height 1: 1.15: 2.3, adjusting the temperature to 1260 ℃, heating for 5h, upsetting according to the upsetting ratio of 2.9, changing the flattening direction to flatten along the side surface again, heating for 5h at 1260 ℃, and upsetting again according to the upsetting ratio of 2.9. Repeating the steps for 30 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, carrying out water cooling quenching, cooling to normal temperature to obtain hot work die steel, and carrying out a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 2.
Example 2
Heating the hot work die electroslag steel ingot to 1300 ℃, flattening along the side surface to a length: width: height 1: 1.2: 2.5, adjusting the temperature to 1280 ℃, heating for 2h, upsetting according to the upsetting ratio of 3.5, changing the flattening direction to flatten along the side surface again, heating at 1280 ℃ for 6h, and upsetting again according to the upsetting ratio of 3.5. Repeating the steps for 50 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, carrying out air cooling quenching, cooling to normal temperature to obtain hot work die steel, and carrying out a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 3.
Example 3
Heating the hot work die electroslag steel ingot to 1260 ℃, flattening along the side surface to a length: width: height 1: 1.1: 2.2, adjusting the temperature to 1240 ℃, heating for 8h, upsetting according to the upsetting ratio of 2.3, changing the flattening direction to flatten along the side surface again, then heating for 3h at 1240 ℃, and upsetting again according to the upsetting ratio of 2.3. Repeating the steps for 10 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, carrying out oil cooling quenching, cooling to normal temperature to obtain hot work die steel, and carrying out a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 4.
Example 4
Heating the hot work die electroslag steel ingot to 1290 ℃, and flattening along the side surface to length: width: height 1: 1.2: 2.4, adjusting the temperature to 1270 ℃, heating for 4h, upsetting according to the upsetting ratio of 2.7, changing the flattening direction to flatten along the side surface again, then heating for 4h at 1270 ℃, and upsetting again according to the upsetting ratio of 2.7. Repeating the steps for 20 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, performing water cooling quenching, cooling to normal temperature to obtain hot work die steel, and performing a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 5.
Example 5
Heating the hot work die electroslag steel ingot to 1280 ℃, flattening along the side surface to length: width: height 1: 1.2: 2.5, adjusting the temperature to 1260 ℃, heating for 6h, upsetting according to the upsetting ratio of 3.3, changing the flattening direction to flatten along the side surface again, heating for 5h at 1260 ℃, and upsetting again according to the upsetting ratio of 3.3. Repeating the steps for 40 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, performing water cooling quenching, cooling to normal temperature to obtain hot work die steel, and performing a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 6.
Example 6
Heating the hot work die electroslag steel ingot to 1280 ℃, flattening along the side surface to length: width: height 1: 1.2: 2.3, adjusting the temperature to 1260 ℃, heating for 3h, upsetting according to the upsetting ratio of 2.5, changing the flattening direction to flatten along the side face again, heating for 5h at 1260 ℃, and upsetting again according to the upsetting ratio of 2.5. Repeating the steps for 30 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, performing water cooling quenching, cooling to normal temperature to obtain hot work die steel, and performing a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 7.
Comparative example 1
The microstructure of the hot-work die steel was obtained by scanning electron microscopy of the above hot-work die steel in the same manner as in example 1 except that the upsetting ratio was 2, as shown in FIG. 8.
Comparative example 2
Heating the hot work die electroslag steel ingot to 1250 ℃, flattening along the side surface to length: width: height 1: 1.15: 2.3, adjusting the temperature to 1250 ℃, heating for 5h, upsetting according to the upsetting ratio of 2.9, changing the flattening direction to flatten along the side face again, then heating for 5h at 1250 ℃, and upsetting again according to the upsetting ratio of 2.9. Repeating the steps for 30 times to obtain a treated hot work die electroslag steel ingot, drawing out the treated hot work die electroslag steel ingot, performing water cooling quenching, cooling to normal temperature to obtain hot work die steel, and performing a scanning electron microscope on the hot work die steel to obtain a microstructure of the hot work die steel, as shown in fig. 9.
Referring to fig. 2 to 9, it can be seen from fig. 2 to 9 that the grain structure of the hot-work die steel obtained in the embodiment of the present invention is finer and more uniform than that obtained in the comparative example, so that the plasticity and toughness of the hot-work die steel are significantly improved, and the treated hot-work die steel has better hardenability, ductility and toughness and tempering stability, and can be used for manufacturing high-strength and high-toughness die materials.
1. Determination of toughness
The hot die steels obtained in examples 1 to 6 of the present invention and comparative examples 1 to 2 were subjected to impact energy measurement in a pendulum impact tester to obtain Table 1.
TABLE 1 determination of impact energy of hot work die steel (Unit: J)
The impact energy can be used as an important index for measuring the toughness of the material, the material with high impact energy is called as a tough material, and the material with low impact energy is called as a brittle material. As is apparent from Table 1 in conjunction with FIGS. 2 and 3, the impact energy in three dimensions of the hot die steels according to examples 1 to 6 of the present invention all meet the GA3 level requirement of the SEP1614 standard. While the impact energy of the hot work die steel in the comparative examples 1 to 2 is significantly lower than that of the hot work die steel in the examples of the present invention, it is demonstrated that the heat treatment method after the optimization of the temperature and upset ratio has significant advantages.
2. Measurement of the intensity
The hot-work die steels obtained in examples 1 to 6 of the present invention and comparative examples 1 to 2 were subjected to a tensile test according to GB/T228.1-2010 metallic Material tensile test method to determine the tensile strengths of the hot-work die steels, and Table 2 was obtained.
TABLE 2 Hot-work die steel tensile test (unit: MPa)
It is apparent from Table 2 that the hot-work die steels prepared in examples of the present invention have higher tensile strength and more excellent properties than the hot-work die steels prepared in comparative examples 1 to 2.
In conclusion, the hot work die steel obtained under various conditions by the heat treatment method of the hot work die steel has obvious toughness and strength advantages, and can be widely applied to various die steels.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (9)
1. A heat treatment method of hot work die steel is characterized by comprising the following steps:
step S10, heating the hot work die electroslag steel ingot to a first heating temperature, and flattening along the side surface;
step S20, adjusting the temperature to be a second heating temperature, heating for 2-8 h, and then upsetting according to the upsetting ratio of 2.3-3.5;
s30, changing the flattening direction to flatten the side face again, heating the side face for 3-6 hours at a third heating temperature, and upsetting the side face again according to the upsetting ratio of 2.3-3.5;
step S40, repeating the steps S10-S30 at least once to obtain a treated hot work die electroslag steel ingot, and drawing the treated hot work die electroslag steel ingot to a specific size to obtain a primary hot work die steel product;
step S50, quenching the primary hot work die steel product, and cooling to normal temperature to obtain the hot work die steel;
wherein the first heating temperature is 1260-1300 ℃, the second heating temperature is 1240-1280 ℃, and the third heating temperature is 1240-1280 ℃.
2. The heat treatment method of hot work die steel according to claim 1, wherein the number of repetitions of steps S10 to S30 in step S40 is 10 to 50.
3. The method for heat-treating a hot die steel as claimed in claim 1, wherein in step S40, the quenching is any one of water-cooling quenching, oil-cooling quenching, and air-cooling quenching.
4. The heat treatment method for hot work die steel according to claim 3, wherein the quenching is water-cooling quenching in step S40.
5. The method for heat-treating a hot work die steel as claimed in claim 1, wherein in step S10, the slab of hot work die electroslag is flattened along the side to a length: width: height 1: (1.1-1.2): (2.2-2.5).
6. The heat treatment method for a hot work die steel according to claim 1, wherein the first heating temperature is 1280 ℃ in step S10.
7. The heat treatment method of a hot work die steel according to claim 1, wherein the second heating temperature is 1260 ℃ in step S10.
8. The heat treatment method of a hot work die steel according to claim 1, wherein the third heating temperature is 1260 ℃ in step S10.
9. A hot-work die steel, characterized in that it is produced by the heat treatment method of a hot-work die steel according to any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102172766A (en) * | 2010-12-30 | 2011-09-07 | 二重集团（德阳）重型装备股份有限公司 | Forging process for nuclear power rotor and other large shaft parts |
| CN104841829A (en) * | 2015-05-21 | 2015-08-19 | 江苏金源锻造股份有限公司 | Squeeze roller forging technology |
| CN105364433A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Hot-working die production technology |
| CN105598328A (en) * | 2016-01-18 | 2016-05-25 | 中钢集团邢台机械轧辊有限公司 | Die steel forging production method |
| CN106521124A (en) * | 2016-08-26 | 2017-03-22 | 湖北东舟重工科技股份有限公司 | Forked flattening, upsetting, and rolling H13 hot-working die steel homogenization forging technology |
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- 2020-01-07 CN CN202010017542.5A patent/CN111139338A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172766A (en) * | 2010-12-30 | 2011-09-07 | 二重集团（德阳）重型装备股份有限公司 | Forging process for nuclear power rotor and other large shaft parts |
| CN104841829A (en) * | 2015-05-21 | 2015-08-19 | 江苏金源锻造股份有限公司 | Squeeze roller forging technology |
| CN105364433A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Hot-working die production technology |
| CN105598328A (en) * | 2016-01-18 | 2016-05-25 | 中钢集团邢台机械轧辊有限公司 | Die steel forging production method |
| CN106521124A (en) * | 2016-08-26 | 2017-03-22 | 湖北东舟重工科技股份有限公司 | Forked flattening, upsetting, and rolling H13 hot-working die steel homogenization forging technology |
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