CN116117111A - Preparation method of high-speed steel working roller - Google Patents

Preparation method of high-speed steel working roller Download PDF

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CN116117111A
CN116117111A CN202211664352.8A CN202211664352A CN116117111A CN 116117111 A CN116117111 A CN 116117111A CN 202211664352 A CN202211664352 A CN 202211664352A CN 116117111 A CN116117111 A CN 116117111A
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speed steel
outer layer
central spindle
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刘娣
胡兵
马凤川
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • B22D19/085—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal of anti-frictional metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • 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
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

The invention discloses a preparation method of a high-speed steel working roller, which belongs to the technical field of materials and comprises the following steps: adopting materials with the component proportion meeting the alloy range of the outer layer material components of the high-speed steel working roller as raw materials, smelting by adopting an electric arc furnace, and discharging and pouring the materials at 1690-1720 ℃ to meet the requirements of the outer layer material components; fixing a central spindle on a cold tooling base, surrounding the central spindle by a cold tooling with a cooling liquid circulation condition, casting an outer layer part, and processing into a composite blank of the outer layer and the central spindle; the cast blank is subjected to pressure processing in a hot isostatic pressing mode; carrying out heat treatment on the cast blank in an annealing mode; and processing the finished product after the heat treatment is finished. The invention prepares the working roller with high wear resistance, high tissue grain size and high surface quality, improves the technical level of roller preparation of the back section of hot rolling, especially thin slab continuous casting and rolling in the rolling industry, and improves the roller efficiency and quality.

Description

Preparation method of high-speed steel working roller
Technical Field
The invention relates to the technical field of materials, in particular to a preparation method of a high-speed steel working roller.
Background
High nickel and chromium are commonly used in the back section of the hot continuous rolling at present, the machine cycle is short, although the conventional high-speed steel has good wear resistance, the high-speed steel cannot be used in a back section frame due to the defect of accident resistance and crack expansion resistance, and the high-speed steel with better wear resistance can be used in the thin slab continuous casting continuous rolling due to no tail flick, steel adhesion and the like.
Based on the background, a material suitable for high accident resistance of the back section of hot continuous rolling needs to be developed, and meanwhile, a comprehensive material with good surface roughness resistance is provided, and how to design a high wear-resistant material and how to determine a preparation method is a problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a high-speed steel working roll, which is used for preparing a working roll with high wear resistance, high tissue grain size and high surface quality, is suitable for hot continuous rolling, particularly for rolling lines such as Duan Jijia after continuous casting and rolling of thin slabs, is suitable for partial cold rolling frames, improves the technical level of preparing rolls for hot rolling in the rolling industry, particularly for the later sections of continuous casting and rolling of thin slabs, and improves the efficiency and quality of the rolls.
In order to solve the technical problems, the invention adopts the following technical scheme:
the preparation method of the high-speed steel working roller comprises the following steps:
step A: adopting materials with the component proportion meeting the alloy range of the outer layer material components of the high-speed steel working roller as raw materials, smelting by adopting an electric arc furnace, and discharging and pouring the materials at 1690-1720 ℃ to meet the requirements of the outer layer material components;
and (B) step (B): fixing a central spindle on a cold tooling base, surrounding the central spindle by a cold tooling with a cooling liquid circulation condition, casting an outer layer part, and processing into a composite blank of the outer layer and the central spindle;
step C: the cast blank is subjected to pressure processing in a hot isostatic pressing mode;
step D: carrying out heat treatment on the cast blank in an annealing mode;
step E: and processing the finished product after the heat treatment is finished.
The technical scheme of the invention is further improved as follows: in the step A, the weight percentage of different alloys in the outer layer material components is as follows: c:0.3 to 2.1 percent, si:0.4 to 1.5 percent, mn:0.3 to 1.3 percent, P is less than or equal to 0.10 percent, S is less than or equal to 0.08 percent, cr: 2-10%, ni:0.5 to 3.0 percent, mo:0.5.0 to 20 percent, V:0.1 to 15.0 percent, W:0.1 to 10.0 percent, nb:0.1 to 1.0 percent and the balance of Fe.
The technical scheme of the invention is further improved as follows: the alloy element satisfies Cr+Mo+W+V+Nb being more than or equal to 5% and less than or equal to 30%.
The technical scheme of the invention is further improved as follows: the technical scheme of the invention is further improved as follows: in the step B, the outer layer of the central spindle is subjected to preheating treatment before casting, and the preheating temperature is 350-500 ℃.
The technical scheme of the invention is further improved as follows: in the step B, the cold-type tool comprises a U-shaped bracket provided with a base and a cooling pipeline arranged outside the bracket; the cooling pipeline comprises a liquid inlet arranged at the bottom end of one side pipeline and a liquid outlet arranged at the top end of the other side pipeline.
The technical scheme of the invention is further improved as follows: and B, pouring cooling medium into the cold tooling.
The technical scheme of the invention is further improved as follows: in the step C, the temperature range of the hot isostatic pressing is 1150-1180 ℃, the hot isostatic pressing pressure is 150-300 MPa, and the duration time is 1-3 h.
The technical scheme of the invention is further improved as follows: in the step D, the annealing temperature is 530-600 ℃, and the heat preservation time is 50-70 h.
By adopting the technical scheme, the invention has the following technical progress:
1. according to the invention, the special cold tooling is designed to chill the liquid molten steel, so that the fine and uniform grain structure in the solidification process is ensured, meanwhile, the outer layer is wrapped with a layer of high-performance outer layer material in a mode of utilizing the central spindle, and the aim of metallurgical bonding of the bonding layer is achieved by preheating the core spindle and reversely etching the outer layer molten steel, so that the good wear resistance of the outer layer is ensured, and meanwhile, the high-performance cold-rolled steel is suitable for the working condition of a rear-stage frame.
2. The invention also solves the problem of roll neck grinding damage fed back in the current market by utilizing the high-strength core shaft, and simultaneously, the roll neck performance with higher strength is also obtained.
3. The invention further improves the strength of the bonding layer and the performance of the outer molten steel by adopting a hot isostatic pressing treatment mode.
Drawings
FIG. 1 is a schematic illustration of an cold work tool of the present invention;
FIG. 2 is a photograph of a matrix structure of a roll body working layer of the present invention after 500 times acid etching;
FIG. 3 is a metallographic structure of a conventional centrifugal manufactured product;
wherein, 1, support, 2, cooling pipeline, 3, inlet, 4, liquid outlet.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and examples:
the preparation method of the high-speed steel working roller comprises the following steps:
step A: adopting materials with the component proportion meeting the alloy range of the outer layer material components of the high-speed steel working roller as raw materials, smelting by adopting an electric arc furnace, and discharging and pouring the materials at 1690-1720 ℃ to meet the requirements of the outer layer material components;
and (B) step (B): fixing a central spindle on a cold tooling base, surrounding the central spindle by a cold tooling, casting an outer layer part under the condition of circulating cooling liquid around the cold tooling, and processing the outer layer part into a composite blank of the outer layer and the central spindle; the outer layer of the central spindle is subjected to preheating treatment before casting, and the preheating temperature is 350-500 ℃;
step C: the cast blank is subjected to pressure processing in a hot isostatic pressing mode, the hot isostatic pressing pressure is 150-300 MPa, the temperature is 1150-1180 ℃, and the pressurizing time is 1-3 hours;
step D: carrying out heat treatment on the cast blank in an annealing mode, wherein the annealing temperature is 530-600 ℃, and the heat preservation time is 50-70 h;
step E: and processing the finished product after the heat treatment is finished.
The weight percentage of the alloy with different material components of the outer layer in the step A is as follows: c:0.3 to 2.1 percent, si:0.4 to 1.5 percent, mn:0.3 to 1.3 percent, P is less than or equal to 0.10 percent, S is less than or equal to 0.08 percent, cr: 2-10%, ni:0.5 to 3.0 percent, mo:0.5.0 to 20 percent, V:0.1 to 15.0 percent, W:0.1 to 10.0 percent, nb:0.1 to 1.0 percent, the balance being Fe and the balance being Fe;
in order to ensure that the high-speed steel working roll has certain wear resistance when in use, a certain carbide amount is required to be formed, but excessive carbide can influence the accident resistance of the working roll, and the content of carbide forming elements is required to be limited, so that the content of main alloy elements of the outer layer is more than or equal to 5 percent and less than or equal to 30 percent of Cr+Mo+W+V+Nb.
In the step B, as shown in fig. 1, the cold-type tooling comprises a U-shaped bracket 1 provided with a base and a cooling pipeline 2 arranged outside the bracket; the cooling pipeline 2 comprises a liquid inlet 3 arranged at the bottom end of one side pipeline and a liquid outlet 4 arranged at the top end of the other side pipeline; in order to have the chilling effect, cooling media such as cooling water are flushed into the cold tooling, so that the cooling speed of the product is improved.
Example 1
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.65%, si:0.53%, mn:0.65%, P:0.001%, S:0.001%, cr:4.12%, ni:0.96%, mo:10.12%, V:12.35%, nb:0.53%, W:3.98% and the balance of Fe. Smelting at 1690 ℃, heating to 1710 ℃ after the components reach the standard, discharging, statically pouring, pouring into a forged steel shaft with 92CrMo core, opening a box 60h after pouring, performing blank light rough machining after opening the box, removing paint and surface black skin, wrapping and welding the roller blank with low alloy steel, sealing, loading into a hot isostatic pressing furnace body for hot pressing, wherein the hot isostatic pressing pressure is 200MPa, the hot pressing temperature is 1160 ℃, the hot pressing time is 1.5h, blowing air to the roller body after the hot pressing is finished, charging and annealing after cooling to 500 ℃, and the annealing temperature is 530 ℃, and preserving heat for 50h. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 2
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.96%, si:0.59%, mn:0.69%, P:0.002%, S:0.002%, cr:4.13%, ni 0.93%, mo:10.05%, V:8.35%, nb:0.23%, W:3.86% and the balance of Fe. Smelting at 1693 ℃, heating to 1712 ℃ after the components reach standards, discharging, statically pouring, pouring into a forged steel shaft with a core of 92CrMo, opening a box 60 hours after pouring, performing blank light rough machining after opening the box, removing paint and surface black skin, wrapping a roller blank with low alloy steel, welding and sealing, loading into a hot isostatic pressing furnace body for hot isostatic pressing, wherein the hot isostatic pressing pressure is 250MPa, the hot pressing temperature is 1163 ℃, the hot pressing time is 1.8 hours, blowing air to the roller body after the hot pressing is finished, cooling to 505 ℃, loading into a furnace for annealing, and the annealing temperature is 535 ℃, and preserving heat for 55 hours. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 3
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.85%, si:0.591%, mn:0.61%, P:0.0015%, S:0.0012%, cr:4.11%, ni:0.69%, mo:8.65%, V:7.35%, nb:0.21%, W:3.83% and the balance of Fe. Smelting at 1691 ℃, heating to 1712 ℃ after the components reach standards, discharging, statically pouring, pouring into a forged steel shaft with a core of 92CrMo, opening a box 58h after pouring, performing blank light rough machining after opening the box, removing paint and surface black skin, wrapping a roller blank with low alloy steel, welding and sealing, loading into a hot isostatic pressing furnace body for hot isostatic pressing, wherein the hot isostatic pressing pressure is 220MPa, the hot pressing temperature is 1172 ℃, the hot pressing time is 1.3h, blowing air to the roller body after the hot pressing is finished, cooling to 502 ℃, loading and annealing, and the annealing temperature is 538 ℃, and preserving heat for 58h. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 4
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.93%, si:0.67%, mn:0.65%, P:0.0016%, S0.0014%, cr:4.15%, ni:0.73%, mo:8.61%, V:7.35%, nb:0.29%, W:3.89% and the balance Fe. Smelting at 1693 ℃, heating to 1715 ℃ after the components reach standards, discharging, statically pouring, pouring into a forged steel shaft with a core of 92CrMo, opening a box after the pouring is finished, performing blank light rough machining after opening the box, removing paint and surface black skin, wrapping a roller blank with low alloy steel, welding and sealing, loading into a hot isostatic pressing furnace body for hot isostatic pressing, wherein the hot isostatic pressing pressure is 150MPa, the hot pressing temperature is 1180 ℃, the hot pressing time is 1.4h, blowing air to the roller body after the hot pressing is finished, cooling to 501 ℃, loading into a furnace for annealing, and maintaining the annealing temperature at 539 ℃ for 70h. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 5
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.53%, si:0.61%, mn:0.63%, P:0.0012%, S:0.0012%, cr:4.11%, ni:0.71%, mo 8.51%, V:7.31%, nb:0.21%, W:3.81% and the balance Fe. Smelting at 1691 ℃, heating to 1711 ℃ after the components reach standards, discharging, statically pouring, pouring into a forged steel shaft with a core of 92CrMo, opening a box after pouring is finished, performing blank rough machining by visible light after opening the box, removing paint and surface black skin, wrapping a roller blank by adopting low alloy steel, welding and sealing, loading into a hot isostatic pressing furnace body for hot isostatic pressing, performing hot isostatic pressing at the pressure of 280MPa, hot pressing at the temperature of 1151 ℃ for 1h, blowing air to the roller body after hot pressing, cooling to 513 ℃, loading into a furnace for annealing, and performing heat preservation for 53h at the annealing temperature of 585 ℃. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 6
Scrap steel, cr3 forging stub bars, ferrovanadium, ferromolybdenum, ferrovanadium powder, nb iron powder and ferrotungsten powder are used as raw materials, and arc furnace smelting is adopted to reach the designed component range: c:0.91%, si:0.66%, mn:0.64%, P:0.0015%, S:0.0016%, cr:4.13%, ni:0.69%, mo:9.13%, V:7.39%, nb:0.25%, W:3.51% and the balance of Fe. Smelting at 1703 ℃, heating to 1720 ℃ after the components reach the standard, discharging, statically pouring, pouring into a forged steel shaft with 92CrMo core, opening a box after pouring is finished, performing blank rough machining by visible light after opening the box, removing paint and surface black skin, wrapping and welding the roller blank by adopting low alloy steel, sealing, loading into a hot isostatic pressing furnace body for hot isostatic pressing, performing hot isostatic pressing at 300MPa, hot pressing temperature 1150 ℃ for 3h, blowing air to the roller body after hot pressing, cooling to 511 ℃, loading for annealing, annealing at 600 ℃, and preserving heat for 57h. After the heat treatment is finished, semi-finishing, detection and finishing detection are carried out until a finished product is obtained.
Example 7
Example 7 is a comparative example, the material of the outer layer is the same as that of example 1, the material of the core is ductile iron, and the centrifugal production is conventional.
The products of examples 1 to 7 were used for tensile mechanical property detection of samples, and the performance detection was carried out in national standard GB/T228. The detection results are shown in Table 1.
Table 1 results of product property tests of examples
Figure BDA0004014133610000071
As shown in fig. 2 and 3, fig. 2 is a metallographic image of a substrate structure of a roll body after 500 times of acid corrosion of a working layer of the roll body, and fig. 3 is a structure of a product produced by a conventional centrifugal process.
By detecting the performance of the developed high-speed steel specially designed and comparing the performance with the embodiment, the developed roller has good wear resistance, the roller neck has excellent strength, the wear resistance of the roller neck is obviously improved compared with that of the ductile iron material used by the conventional centrifugal roller, and meanwhile, the thermal fatigue performance of the roller body is higher than that of the conventional high-alloy high-speed steel material. From the thermal wear test, the developed high-speed steel working roll was superior to example 7 in terms of machine wear + machine grinding.
According to the performance detection result and the metallographic picture, the developed high-speed steel roller has good wear resistance, the roller neck strength is higher than that of the conventional ductile iron material, the characteristics of high wear resistance of the roller body and high toughness of the core part are considered, and meanwhile, the roller has fine grains and good accident resistance.
In summary, the working roll with high wear resistance, high tissue grain size and high surface quality is prepared by the method, is suitable for hot continuous rolling, particularly rolling lines such as Duan Jijia after continuous casting and rolling of sheet billets, is suitable for partial cold rolling frames, improves the technical level of roll preparation in the hot rolling, particularly in the later section of continuous casting and rolling of sheet billets in the rolling industry, and improves the roll efficiency and quality.

Claims (8)

1. A preparation method of a high-speed steel working roll is characterized by comprising the following steps: the method comprises the following steps:
step A: adopting materials with the component proportion meeting the alloy range of the outer layer material components of the high-speed steel working roller as raw materials, smelting by adopting an electric arc furnace, and discharging and pouring the materials at 1690-1720 ℃ to meet the requirements of the outer layer material components;
and (B) step (B): fixing a central spindle on a cold tooling base, surrounding the central spindle by a cold tooling with a cooling liquid circulation condition, casting an outer layer part, and processing into a composite blank of the outer layer and the central spindle;
step C: the cast blank is subjected to pressure processing in a hot isostatic pressing mode;
step D: carrying out heat treatment on the cast blank in an annealing mode;
step E: and processing the finished product after the heat treatment is finished.
2. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: in the step A, the weight percentage of different alloys in the outer layer material components is as follows: c:0.3 to 2.1 percent, si:0.4 to 1.5 percent, mn:0.3 to 1.3 percent, P is less than or equal to 0.10 percent, S is less than or equal to 0.08 percent, cr: 2-10%, ni:0.5 to 3.0 percent, mo:0.5.0 to 20 percent, V:0.1 to 15.0 percent, W:0.1 to 10.0 percent, nb:0.1 to 1.0 percent and the balance of Fe.
3. The method for manufacturing a high-speed steel work roll according to claim 2, wherein: the alloy element satisfies Cr+Mo+W+V+Nb being more than or equal to 5% and less than or equal to 30%.
4. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: in the step B, the outer layer of the central spindle is subjected to preheating treatment before casting, and the preheating temperature is 350-500 ℃.
5. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: in the step B, the cold type tool comprises a U-shaped bracket (1) provided with a base and a cooling pipeline (2) arranged on the outer side of the bracket; the cooling pipeline (2) comprises a liquid inlet (3) arranged at the bottom end of one side pipeline and a liquid outlet (4) arranged at the top end of the other side pipeline.
6. The method for manufacturing a high-speed steel work roll according to claim 5, wherein: and B, pouring cooling medium into the cold tooling.
7. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: in the step C, the temperature range of the hot isostatic pressing is 1150-1180 ℃, the hot isostatic pressing pressure is 150-300 MPa, and the duration time is 1-3 h.
8. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: in the step D, the annealing temperature is 530-600 ℃, and the heat preservation time is 50-70 h.
CN202211664352.8A 2022-12-23 2022-12-23 Preparation method of high-speed steel working roller Pending CN116117111A (en)

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