A powder high-speed steel plate and its preparation method and application

Abstract

The present invention discloses a powder high-speed steel plate and a preparation method and application thereof, and relates to the technical field of metal materials. The present invention utilizes a mixed powder formed by high-speed steel powder and a binder to roll a green billet, and then degreases and sinters the green billet. The green billet is combined with a stamping process to stamp the powder high-speed steel plate into a desired shape before degreasing and sintering, which can greatly reduce the forming cost of powder high-speed steel flat plate parts. By optimizing the operating parameters of rolling and degreasing and sintering, the mechanical properties of the product are significantly improved, and a large length of powder can be prepared under the condition of sufficient raw material powder, which provides a new idea for preparing large-size plates. The traditional hot isostatic pressing process requires the preparation of a package, which is not only costly and has a long process, but also cannot prepare large-size powder high-speed steel plates. Compared with the traditional process, the present invention can significantly shorten the process flow and greatly reduce the forming cost of powder high-speed steel flat plate parts.

Description

Technical Field

[0001] The present invention relates to the technical field of metal materials, and in particular to a powder high-speed steel plate and a preparation method and application thereof. Background Art

[0002] Powder high-speed steel is a type of material developed on the basis of traditional molten cast high-speed steel. It uses powder metallurgy to prepare high-alloy content and high-performance tool and die materials. Compared with traditional molten cast high-speed steel, it eliminates the macro-segregation of alloy components, and the carbides are small and evenly distributed. It has excellent comprehensive properties such as high hardness, high corrosion resistance, high red hardness, and high wear resistance. It has been widely used in the preparation of various taps, drills, cutting tools and other cutting equipment as well as various stamping dies.

[0003] At present, the main preparation method of powder high-speed steel is canning + hot isostatic pressing. The main steps include: in a closed container, equal pressure is applied to the canning in all directions, and the powder in the canning is sintered and formed to achieve densification under the action of high temperature and high pressure for a long time. The hot isostatic pressing process greatly reduces the sintering temperature of the powder due to the effect of high pressure, so that the hot isostatic pressed powder high-speed steel has the advantages of fine grains, uniform carbide distribution and nearly full density. However, canning + hot isostatic pressing is not only costly and has a long process, but also limited by the size of the canning and hot isostatic pressing, it is difficult to prepare large-sized powder high-speed plate.

[0004] Therefore, there is an urgent need to develop low-cost, short-process technology to prepare powder high-speed steel plates.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a powder high-speed steel plate and a preparation method and application thereof, aiming to provide a process with short flow and low cost to realize the preparation of large-size powder high-speed steel plates.

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides a method for preparing a powder high speed steel plate, comprising:

[0009] Rolling a mixed powder formed by high-speed steel powder and a binder to obtain a green body;

[0010] Debinding and sintering the green body;

[0011] The process of rolling the mixed powder includes: heating the mixed powder to 110°C-130°C, controlling the rolling pressure to 100t-200t, the rolling gap size to 0.3mm-0.5mm, and the rolling speed to 10r / min-15r / min during the rolling process; the binder is selected from solid paraffin;

[0012] The debinding and sintering process includes: firstly high-temperature debinding at 200℃-450℃, and then high-temperature sintering at 1050℃-1250℃;

[0013] After debinding and sintering, a hot isostatic pressing densification treatment is performed; during the hot isostatic pressing densification treatment, the operating temperature is controlled to be 1000°C-1150°C, the pressure is 100MPa-150MPa, and the insulation time is 1h-3h.

[0014] In an optional embodiment, during the rolling process, the diameter of the working roll is controlled to be 200 mm-250 mm, and the diameter of the backup roll is controlled to be 400 mm-500 mm;

[0015] And / or, the powder rolling mill is a horizontal four-roller cold rolling mill.

[0016] In an optional embodiment, the mass ratio of high speed steel powder to binder is 100:(1-5);

[0017] and / or, the high speed steel powder has the following composition, by mass percentage: C 1.8-2.1%, Cr18-21%, V 3-5%, Mo 0.8-1.1%, Si 0.6-0.8%, W 0.5-0.7%, Mn 0.2-0.4%, N 0.1-0.3%, and the balance is Fe;

[0018] And / or, the average particle size of the high speed steel powder is 10 μm-60 μm.

[0019] In an optional embodiment, the preparation process of the mixed powder includes: mixing the high-speed steel powder and the binder in alcohol and heating them, and controlling the heating temperature to 50° C.-70° C. to evaporate the alcohol.

[0020] In an optional embodiment, the temperature of high-temperature degreasing is controlled to be 350° C.-450° C., and the holding time is 30 min-120 min;

[0021] The heating rate during the high-temperature degreasing process is controlled to be 0.5℃ / min-4℃ / min.

[0022] In an optional embodiment, during the high temperature sintering process, the sintering temperature is controlled to be 1050°C-1150°C, and the holding time is 30min-120min;

[0023] The heating rate of the high temperature sintering process is controlled to be 3℃ / min-8℃ / min.

[0024] In an optional embodiment, the heating rate of the hot isostatic pressing densification treatment is controlled to be 8-12° C. / min.

[0025] In an optional embodiment, high pressure quenching is performed after hot isostatic pressing densification treatment is completed;

[0026] The high pressure quenching rate is 1400℃ / min-1600℃ / min.

[0027] In a second aspect, the present invention provides a powder high speed steel plate, which is prepared by the preparation method of any one of the aforementioned embodiments.

[0028] In a third aspect, the present invention provides use of the powder high-speed steel plate of the aforementioned embodiment in the preparation of cutting equipment or stamping abrasive tools.

[0029] The present invention has the following beneficial effects: the present invention uses a mixed powder formed by high-speed steel powder and a binder to roll a green billet, then degreases and sinters the green billet, and combines it with a stamping process to stamp the powder high-speed steel sheet into a desired shape before degreasing and sintering, which can greatly reduce the forming cost of powder high-speed steel flat plate parts. By optimizing the operating parameters of rolling and degreasing and sintering, the mechanical properties of the product are significantly improved, and a large length of powder can be prepared under the condition of sufficient raw material powder, which provides a new idea for preparing large-size plates.

[0030] The traditional hot isostatic pressing process requires the preparation of a can, which is not only costly and time-consuming, but also incapable of preparing large-sized powder high-speed steel plates. Compared with the traditional process, the present invention can significantly shorten the process and greatly reduce the cost of forming powder high-speed steel flat plate parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 The powder high speed steel powder used in the present invention;

[0033] Figure 2 It is a powder high speed steel plate obtained after sintering;

[0034] Figure 3 The microstructure of the powder high speed steel plate prepared in Example 1;

[0035] Figure 4 The microstructure of the powder high speed steel plate prepared in Example 2;

[0036] Figure 5 This is the microstructure of the powder high speed steel plate prepared in Comparative Example 1. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0038] The embodiment of the present invention provides a method for preparing a powder high speed steel plate, comprising the following steps:

[0039] S1. Preparation of mixed powder

[0040] High speed steel powder and a binder are mixed to prepare a mixed powder.

[0041] In some embodiments, the preparation process of the mixed powder includes: mixing and heating the high-speed steel powder and the binder in alcohol, controlling the heating temperature to 50°C-70°C, and allowing the alcohol to evaporate completely for use. The high-speed steel powder and the binder are stirred and mixed in alcohol. Mixing in alcohol can improve the uniformity of the raw material mixing to a certain extent, and then heating is performed to fully remove the alcohol. Specifically, the heating temperature can be 50°C, 60°C, 70°C, etc., and the heating time is not limited as long as the alcohol can be fully removed.

[0042] Furthermore, the mass ratio of high speed steel powder to binder is 100:(1-5), such as 100:1, 100:2, 100:3, 100:4, 100:5, etc. The amount of binder is preferably within the above range, which can improve the forming effect after rolling. The binder can be solid paraffin.

[0043] Furthermore, the composition of the high speed steel powder is as follows, by mass percentage: C 1.8-2.1%, Cr18-21%, V 3-5%, Mo 0.8-1.1%, Si 0.6-0.8%, W 0.5-0.7%, Mn 0.2-0.4%, N 0.1-0.3%, and the balance is Fe.

[0044] High-speed steel powder is spherical or nearly spherical powder, and the average particle size is 10μm-60μm, such as 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, etc., which can be selected according to the particle size requirements of the product powder.

[0045] S2. Rolling

[0046] The mixed powder provided by S1 is rolled to obtain a green body for later use.

[0047] The process of rolling the mixed powder includes: putting the mixed powder into the silo and heating it to 110℃-130℃, controlling the rolling pressure to 100t-200t, the rolling gap size to 0.3mm-0.5mm, the rolling speed to 10r / min-15r / min, the working roll diameter to 200mm-250mm, and the supporting roll diameter to 400mm-500mm. High-speed steel powder itself is hard and difficult to roll. By optimizing the parameters of the rolling process, the density of the plate is improved, and after degreasing and sintering, a plate with excellent mechanical properties is obtained.

[0048] Specifically, the heating temperature of the mixed powder can be 110°C, 120°C, 130°C, etc., the rolling pressure can be 100t, 130t, 150t, 180t, 200t, etc., the rolling gap size can be 0.3mm, 0.4mm, 0.5mm, etc., the rolling speed can be 10r / min, 13r / min, 15r / min, etc., the working roll diameter can be 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, etc., the supporting roll diameter can be 400mm, 420mm, 450mm, 480mm, 500mm, etc.

[0049] In some embodiments, the powder rolling mill may be a horizontal four-roller cold rolling mill, but is not limited thereto.

[0050] S3, debinding sintering

[0051] The green body is degreased and sintered, first sintered at low temperature to remove paraffin and the like, and then sintered at high temperature to avoid the reaction of binders such as paraffin with the metal during the high-temperature sintering process and to avoid the formation of impurities such as carbides.

[0052] In some embodiments, the debinding and sintering process includes: first high-temperature debinding at 200℃-450℃, and then high-temperature sintering at 1050℃-1250℃, and the density and mechanical properties of the plate after sintering are improved by regulating the sintering temperatures of the two steps.

[0053] In a preferred embodiment, the temperature of high-temperature degreasing is controlled to be 350°C-450°C, the holding time is 30min-120min, and the heating rate during high-temperature degreasing is controlled to be 0.5°C / min-4°C / min. By optimizing the temperature, time and other parameters of high-temperature degreasing, binders such as paraffin can be more fully removed.

[0054] In a preferred embodiment, during the high-temperature sintering process, the sintering temperature is controlled to be 1050°C-1150°C, the holding time is 30min-120min, and the heating rate during the high-temperature sintering process is controlled to be 3°C / min-8°C / min. Further regulating the temperature, time and other parameters of the high-temperature sintering is conducive to improving the density of the product.

[0055] Specifically, the controlled operating temperature during the high-temperature degreasing process can be 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, etc., the insulation time can be 30min, 50min, 80min, 100min, 120min, etc., and the heating rate during the high-temperature degreasing process can be 0.5°C / min, 1.0°C / min, 2.0°C / min, 3.0°C / min, 4.0°C / min, etc.

[0056] Specifically, the controlled operating temperature during the high-temperature sintering process can be 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, etc., the holding time for high-temperature sintering can be 30min, 50min, 80min, 100min, 120min, etc., and the heating rate during the high-temperature sintering process can be 3.0°C / min, 4.0°C / min, 5.0°C / min, 6.0°C / min, 7.0°C / min, 8.0°C / min, etc.

[0057] S4, hot isostatic pressing densification treatment

[0058] After degreasing and sintering, hot isostatic pressing densification treatment is carried out, followed by high-pressure quenching. The hot isostatic pressing densification treatment can further improve the density of the product and improve the mechanical properties of the plate.

[0059] In some embodiments, during the hot isostatic pressing densification process, the operating temperature is controlled to be 1000℃-1150℃, the pressure is 100MPa-150MPa, and the holding time is 1h-3h (hours); the heating rate of the hot isostatic pressing densification process is controlled to be 8-12℃ / min. By adjusting the parameters such as the temperature, pressure and time of the hot isostatic pressing densification process, the density of the plate can be further improved.

[0060] Specifically, during the hot isostatic pressing densification treatment, the operating temperature can be 1000°C, 1050°C, 1100°C, 1150°C, etc., the pressure can be 100MPa, 110MPa, 120MPa, 130MPa, 140MPa, 150MPa, etc., the holding time can be 1h, 2h, 3h, etc., and the heating rate for controlling the hot isostatic pressing densification treatment can be 8°C / min, 9°C / min, 10°C / min, 11°C / min, 12°C / min, etc.

[0061] In some embodiments, high pressure quenching is performed after the hot isostatic pressing densification treatment is completed, and the high pressure quenching rate is 1400°C / min-1600°C / min, such as 1400°C / min, 1500°C / min, 1600°C / min, etc. High pressure quenching is performed after the hot isostatic pressing densification treatment is completed and the temperature is lowered without exhaust (i.e., closed condition).

[0062] It should be noted that the preparation method provided in the embodiment of the present invention sequentially undergoes the processes of powder rolling-debinding sintering-hot isostatic pressing. Powder rolling is to feed a mixture of powder and binder into a roller through a hopper, and the raw powder is rolled into a slab through the friction and pressing force between the powder and the roller, and then debinding and sintering into a plate. This method can continuously produce large-size slabs, and combined with the subsequent hot isostatic pressing process, powder high-speed steel plates can be prepared at low cost and in a short process.

[0063] The embodiment of the present invention also provides a powder high-speed steel plate, which is prepared by the preparation method provided by the embodiment of the present invention, and has the advantages of short preparation process, low cost, excellent mechanical properties, etc. The powder high-speed steel plate provided by the embodiment of the present invention can be further used to prepare cutting equipment such as taps, drills, and knives, and can also be further used to prepare stamping molds.

[0064] It should be noted that the powder steel plate produced by the present invention has a smooth surface, a controllable thickness between 0.2 mm and 3.0 mm, a density of up to 99.8%, a hardness of up to 389 Hv, a yield strength of up to 756 MPa, and a tensile strength of up to 1030 MPa. The powder steel plate can be prepared in a short process and at a low cost, and the obtained plate can be used in the fields of hardware knives and scissors, mechanical processing, etc.

[0065] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0066] It should be noted that the high-speed steel powder used in the following examples and comparative examples was purchased from Tiangong International Co., Ltd., model TPMD41A, with an average particle size of 10-60 μm. The composition of the high-speed steel powder by mass percentage is shown in Table 1:

[0067] Table 1 Composition of high speed steel powder

[0068]

[0069] The SEM image of the high speed steel powder used in the embodiment of the present invention is as follows: Figure 1 As shown, the powder particles are spherical or quasi-spherical, the large particle size reaches 30μm-40μm, and the small particle size is 2μm-5μm.

[0070] Example 1

[0071] This embodiment provides a method for preparing a powder high speed steel plate, and the specific steps are as follows:

[0072] (1) Place high-speed steel powder and binder (solid paraffin) in alcohol, stir and mix, and heat to 60°C. The amount of binder added is 3% (i.e., the mass ratio of high-speed steel powder to binder is 100:3), and the mass ratio of high-speed steel powder to alcohol is 1:1. Wait until the alcohol is completely evaporated and set aside.

[0073] (2) Put the mixed powder into the silo and heat the silo to 120°C;

[0074] (3) The mixed powder is fed into a horizontal four-roll cold rolling mill with a working roll diameter of 220 mm, a backup roll diameter of 450 mm, a maximum rolling pressure of 200 t, a rolling gap size of 0.3 mm, and a rolling speed of 15 r / min;

[0075] (4) The rolled slab is placed in a vacuum sintering furnace (the pressure is controlled at 1×10 -3 Pa), debinding temperature is 400℃, heating rate is 2℃ / min, and holding time is 30min; sintering temperature is 1050℃, heating rate is 5℃ / min, and holding time is 30min;

[0076] (5) The sintered plate was placed in a hot isostatic press for densification treatment. The densification temperature was 1000°C, the heating rate was 10°C / min, the pressure was 100 MPa, the holding time was 2 h, and the high-pressure quenching rate was 1500°C / min.

[0077] Figure 2 This is a physical picture of the powder high-speed steel plate obtained after sintering in step (5) of Example 1.

[0078] Figure 3 The microstructure diagram of the powder high speed steel plate prepared in Example 1 shows that carbide particles are uniformly precipitated on the matrix.

[0079] Example 2

[0080] This embodiment provides a method for preparing a powder high speed steel plate, and the specific steps are as follows:

[0081] (1) Place high-speed steel powder and binder (solid paraffin) in alcohol, stir and mix, and heat to 60°C. The amount of binder added is 3%, and the mass ratio of high-speed steel powder to alcohol is 1:1. Wait until the alcohol is completely evaporated and set aside.

[0082] (2) Put the mixed powder into the silo and heat the silo to 120°C;

[0083] (3) The mixed powder is fed into a horizontal four-roll cold rolling mill with a working roll diameter of 220 mm, a backup roll diameter of 450 mm, a maximum rolling pressure of 200 t, a rolling gap size of 0.5 mm, and a rolling speed of 15 r / min;

[0084] (4) The rolled slab is placed in a vacuum sintering furnace with a degreasing temperature of 400°C, a heating rate of 2°C / min, and a holding time of 30 min; the sintering temperature is 1150°C, the heating rate is 5°C / min, and the holding time is 120 min;

[0085] (5) The sintered plate was placed in a hot isostatic press for densification treatment. The densification temperature was 1050°C, the heating rate was 10°C / min, the pressure was 100 MPa, the holding time was 2 h, and the high-pressure quenching rate was 1500°C / min.

[0086] Figure 4 The microstructure diagram of the powder high speed steel plate prepared in Example 2 shows that carbide particles are uniformly precipitated on the matrix, but the volume fraction is reduced compared with Example 1.

[0087] Comparative Example 1

[0088] This embodiment provides a method for preparing a powder high speed steel plate, and the specific steps are as follows:

[0089] (1) Place high-speed steel powder and binder (solid paraffin) in alcohol, stir and mix, and heat to 60°C. The amount of binder added is 3%, and the mass ratio of high-speed steel powder to alcohol is 1:1. Wait until the alcohol is completely evaporated and set aside.

[0090] (2) Put the mixed powder into the silo and heat the silo to 120°C;

[0091] (3) The mixed powder is fed into a horizontal four-roll cold rolling mill with a working roll diameter of 220 mm, a backup roll diameter of 450 mm, a maximum rolling pressure of 200 t, a rolling gap size of 0.1 mm, and a rolling speed of 10 r / min;

[0092] (4) The rolled slab is placed in a vacuum sintering furnace with a degreasing temperature of 400°C, a heating rate of 2°C / min, and a holding time of 30 min; the sintering temperature is 1250°C, the heating rate is 5°C / min, and the holding time is 120 min;

[0093] (5) The sintered plate was placed in a hot isostatic press for densification treatment. The densification temperature was 1150 °C, the heating rate was 10 °C / min, the pressure was 100 MPa, the holding time was 2 h, and the high-pressure quenching rate was 1500 °C / min.

[0094] Figure 5The microstructure diagram of the powder high speed steel plate prepared in Comparative Example 1 shows that carbide particles are uniformly precipitated on the matrix, but the volume fraction is further reduced compared with Example 2.

[0095] Comparative Example 2

[0096] The only difference from Example 1 is that in step (3), the rolling gap size is controlled to be 0.1 mm.

[0097] Comparative Example 3

[0098] The only difference from Example 1 is that in step (3), the rolling gap size is controlled to be 1.0 mm.

[0099] Comparative Example 4

[0100] The only difference from Example 1 is that in step (3), the rolling gap size is controlled to be 2.0 mm.

[0101] Comparative Example 5

[0102] The only difference from Example 1 is that in step (3), the rolling gap size is controlled to be 3.0 mm.

[0103] Comparative Example 6

[0104] The only difference from Example 1 is that in step (3), the rolling gap size is controlled to be 4.0 mm.

[0105] Comparative Example 7

[0106] The only difference from Example 1 is that the rolling speed in step (3) is controlled to be 3 r / min.

[0107] Comparative Example 8

[0108] The only difference from Example 1 is that the rolling speed in step (3) is controlled to be 5 r / min.

[0109] Comparative Example 9

[0110] The only difference from Example 1 is that the rolling speed in step (3) is controlled to be 20 r / min.

[0111] Comparative Example 10

[0112] The only difference from Example 1 is that the rolling speed in step (3) is controlled to be 30 r / min.

[0113] Comparative Example 11

[0114] The only difference from Example 1 is that the rolling speed in step (3) is controlled to be 40 r / min.

[0115] Comparative Example 12

[0116] The only difference from Example 1 is that step (5) is not performed.

[0117] Comparative Example 13

[0118] This comparative example provides a traditional encapsulation + hot isostatic pressing process, the main steps of which include: placing powder or powder compact into the encapsulation; removing the gas adsorbed on the powder surface, the gaps between powders and the encapsulation; vacuum sealing the encapsulation and placing it in a hot isostatic press for sintering and densification; removing the encapsulation by mechanical or acid leaching methods to obtain a product.

[0119] Test Example 1

[0120] The mechanical properties of the powder high speed steel plates obtained in the examples and comparative examples were tested, and the test items included microhardness, tensile strength, yield strength, and elongation. The specific test results are shown in Table 2.

[0121] Among them, the testing equipment for microhardness is the Zwick / Roell ZHμ hardness tester, and the testing equipment for tensile strength, yield strength and elongation is the CMT5105 universal testing machine.

[0122] Table 2 Mechanical properties test results of examples and comparative examples

[0123]

[0124] It can be seen from Table 2 that the product prepared by the short-process method provided by the embodiment of the present invention has excellent mechanical properties, which can achieve the mechanical properties of the traditional sheathing process of Example 13, but can significantly shorten the process flow and greatly reduce the forming cost of powder high-speed steel flat parts.

[0125] The rolling speed of comparative example 10 is 30 r / min. At a higher rolling speed, the performance (especially the yield strength) is not significantly improved, and the energy consumption is significantly increased. Therefore, the rolling speed is preferably 10 r / min-15 r / min.

[0126] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the overall concept of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a powder high-speed steel plate, characterized in that: include: Rolling a mixed powder formed by high-speed steel powder and a binder to obtain a green body; Degreasing and sintering the green compact; The process of rolling the mixed powder includes: heating the mixed powder to 110°C-130°C, controlling the rolling pressure to 100t-200t, the rolling gap size to 0.3mm-0.5mm, and the rolling speed to 10r / min-15r / min during the rolling process; the binder is selected from solid paraffin; the mass ratio of the high-speed steel powder to the binder is 100:(1-5); The debinding and sintering process includes: firstly performing high-temperature debinding at 200°C-450°C, and then performing high-temperature sintering at 1050°C-1250°C; After the degreasing and sintering, a hot isostatic pressing densification treatment is performed; during the hot isostatic pressing densification treatment, the operating temperature is controlled to be 1000° C.-1150° C., the pressure is 100MPa-150MPa, and the holding time is 1h-3h; The composition of the high speed steel powder is as follows, by mass percentage: C 1.8-2.1%, Cr18-21%, V 3-5%, Mo0.8-1.1%, Si 0.6-0.8%, W 0.5-0.7%, Mn 0.2-0.4%, N 0.1-0.3%, and the balance is Fe.

2. The preparation method according to claim 1, characterized in that: During the rolling process, the working roll diameter is controlled to be 200mm-250mm, and the supporting roll diameter is 400mm-500mm; And / or, the powder rolling mill is a horizontal four-roller cold rolling mill.

3. The preparation method according to claim 1 or 2, characterized in that: The average particle size of the high speed steel powder is 10 μm-60 μm.

4. The preparation method according to claim 3, characterized in that: The preparation process of the mixed powder includes: mixing the high-speed steel powder and the binder in alcohol and heating them, and controlling the heating temperature to be 50° C.-70° C. to evaporate the alcohol.

5. The preparation method according to claim 1, characterized in that: Control the high-temperature degreasing temperature to 350℃-450℃ and the holding time to 30min-120min; The heating rate during the high-temperature degreasing process is controlled to be 0.5℃ / min-4℃ / min.

6. The preparation method according to claim 1, characterized in that: During the high temperature sintering process, the sintering temperature is controlled to be 1050°C-1150°C, and the holding time is 30min-120min; The heating rate of the high temperature sintering process is controlled to be 3℃ / min-8℃ / min.

7. The preparation method according to claim 1, characterized in that: The heating rate of the hot isostatic pressing densification treatment is controlled to be 8-12°C / min.

8. Use of the powder high-speed steel plate prepared by the preparation method according to any one of claims 1 to 7 in the preparation of cutting equipment or stamping abrasive tools.

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