CN115041686B - Preparation method of high-speed steel working roller - Google Patents
Preparation method of high-speed steel working roller Download PDFInfo
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- CN115041686B CN115041686B CN202210724481.5A CN202210724481A CN115041686B CN 115041686 B CN115041686 B CN 115041686B CN 202210724481 A CN202210724481 A CN 202210724481A CN 115041686 B CN115041686 B CN 115041686B
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- 229910000997 High-speed steel Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 33
- 238000004663 powder metallurgy Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000000498 ball milling Methods 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229940057995 liquid paraffin Drugs 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 238000009694 cold isostatic pressing Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 19
- 238000005266 casting Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 13
- 238000007599 discharging Methods 0.000 description 11
- 229910000851 Alloy steel Inorganic materials 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 229910000967 As alloy Inorganic materials 0.000 description 6
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 6
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 238000007514 turning Methods 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- 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
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- 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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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a preparation method of a high-speed steel working roll, which belongs to the technical field of powder metallurgy roll preparation, wherein a powder metallurgy technology is applied to the roll field, and the powder metallurgy roll with high fine grain size, high wear resistance and high tissue uniformity is obtained through powder preparation, sample blank preparation, sintering, further casting compounding and heat treatment.
Description
Technical Field
The invention relates to a preparation method of a high-speed steel working roller, and belongs to the technical field of powder metallurgy roller preparation.
Background
With the development of short-process rolling technology, near-net forming technology has a vigorous development trend in the rolling field and the steel industry, the performance requirement on the roller is continuously improved, the powder metallurgy roller is compact in structure, segregation generated in the solidification process of a conventional casting roller can be eliminated, meanwhile, the powder metallurgy roller has the advantage of good formability, the characteristics of near-net forming manufacturing are met, and meanwhile, the requirements of the roller for short-process long-roller service rolling can be met due to fine grains, high wear resistance and high uniformity of the structure.
The development of the powder metallurgy high-speed steel aiming at the characteristics of the rear section, a finished product rack and short-process rolling and how to determine the preparation process are the problems to be solved in the urgent need of developing the powder metallurgy high-speed steel working roll.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a high-speed steel working roll, so as to meet the requirement of using high-speed steel in the rear section of a hot rolling line, particularly in a finished product rack, meet the requirement of using rolls in a short-process rolling line and improve the quality of 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: c:1.0 to 2.30 percent, si:0.5 to 2.0 percent, B:0.5-1.5%, mn:0.2 to 1.2 percent, P is less than or equal to 0.10 percent, S is less than or equal to 0.1 percent, cr:1.0-8.0%, ni:0.5-1.20%, mo:2.0-10.00%, V:2.00-10.00, W:0.1-5.0 percent, nb is less than or equal to 1.0 percent, and the balance is Fe;
the preparation method comprises the following steps:
step A, placing the alloy materials in the proportion into a ball mill for ball milling;
step B, after ball milling, the vacuum degree is less than or equal to 10 -3 Heating and drying in a vacuum furnace of Pa, cooling to 30-50deg.C, grinding, sieving with a screen of 400 meshes or more, and pulverizing;
step C, preparing a sample blank by adopting a die, and compacting for later use;
step D, sintering by using a vacuum sintering furnace to prepare a powder metallurgy roller sleeve;
step E, machining an inner hole of the powder metallurgy roller sleeve to remove blank defects, and preheating in a preheating furnace;
f, placing the preheated powder metallurgy roller sleeve in a sand mould, pouring core molten steel, solidifying and forming;
g, placing the cast blank in a heat treatment furnace for heat treatment;
and step H, processing and detecting until the finished product is obtained after the heat treatment is finished.
The technical scheme of the invention is further improved as follows: the granularity of the alloy material in the step A is 2-3mm, a planetary ball mill is adopted, the liquid medium of the ball mill is one of absolute alcohol, acetone and aviation kerosene, and 3-5% of liquid paraffin is added.
The technical scheme of the invention is further improved as follows: the ball grinding balls adopted in the step A are hard alloy balls, and the balls are: the material proportion is 10:1, and the ball milling time is 50-100h.
The technical scheme of the invention is further improved as follows: the drying temperature in the step B is 150-350 ℃ and the drying time is 40-80h; at the same time cooling the mixture until the vacuum degree is less than or equal to 10 -3 Mp is performed under the condition of Mp.
The technical scheme of the invention is further improved as follows: and C, the pressure of a press machine in the compacting process is more than or equal to 200MPa, the compacting time is 3-20S, or a cold isostatic pressing method is adopted for compacting.
The technical scheme of the invention is further improved as follows: the sintering process in the step D is as follows: after the heat preservation is carried out for 8-20h at 350-450 ℃, the temperature is increased to the sintering temperature at the heating rate of 5-20 ℃/h, the sintering temperature is 1200-1300 ℃, the sintering time is 60-120min, and the temperature is reduced to the room temperature at the speed of 20-30 ℃/h after the sintering is finished.
The technical scheme of the invention is further improved as follows: and E, preheating at 500-600 ℃ for 10-20 hours.
The technical scheme of the invention is further improved as follows: and F, the core molten steel material in the step is low alloy steel or iron-based material with enough strength.
The technical scheme of the invention is further improved as follows: and (C) annealing at 600-700 ℃ for 40-60h.
By adopting the technical scheme, the invention has the following technical progress:
the invention applies the powder metallurgy technology to the field of rollers, and the powder metallurgy rollers with high fine grain size, high wear resistance and high structure uniformity are obtained through powder preparation, sample blank preparation, sintering, further pouring compounding and heat treatment, liquid paraffin is added as an adhesive in the ball milling stage, compaction molding of the prepared powder is facilitated, the liquid paraffin is volatilized to be removed in the sintering process in the heat preservation process of 350-450 ℃, the gas is continuously pumped in the sintering furnace body, meanwhile, ball milling medium such as anhydrous wine steel, acetone and aviation kerosene is added in the ball milling process, oxidation of the powder in the ball milling process is avoided, the powder belongs to a semi-molten state in the sintering process, and large-block eutectic carbide in the conventional casting roller is eliminated in the structure, so the powder has higher accident resistance, wear resistance and structure uniformity than the conventional high-speed steel roller.
The adopted sintering process can finish the formation of each phase by the powder in a micro-melting state, and meanwhile, the growth of crystal grains and the segregation of components are avoided. The powder metallurgy high-speed steel roller can effectively eliminate the defects of component segregation, coarse grains and the like of the cast high-speed steel, has uniform structure and fine grains, can be well adapted to the working condition characteristics of the finished product frame high-speed steel, and meanwhile, the powder metallurgy high-speed steel can realize near-net-shape manufacture, the casting defects of the cast high-speed steel need to be removed, the machining allowance is greatly higher than that of the powder metallurgy high-speed steel, and the yield of the powder metallurgy high-speed steel is greatly increased; meanwhile, the production period of the powder metallurgy high-speed steel process is greatly shortened compared with that of cast high-speed steel.
Drawings
FIG. 1 is a sintering process diagram of the present invention;
fig. 2 is a sintered powder metallurgy high speed steel.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The scrap steel, the forged steel stub bar, the ferromolybdenum, the ferrovanadium and the electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is less than or equal to 0.10 percent of C1.76,Si 0.93,B 0.56,Mn 0.69,Cr 6.23,Ni 0.62,Mo 4.95,V 8.32,W 0.65,P, less than or equal to 0.1 percent of S, less than or equal to 1.0 percent of Nb, and the balance of Fe. Ball milling in planetary ball mill, ball milling in absolute alcohol for 60 hr, adding 3.3% liquid paraffin, filtering with filter paper, vacuum stoving in vacuum oven at 0.001Pa and 156 deg.c for 45 hr, cooling to 25 deg.c and discharging. Screening powder by using a 400-mesh screen, pressing by using a press machine to obtain a sample with a roller body diameter of 710mm and an inner hole of 515mm, and vacuumizing to 10 -4 Sintering in a vacuum furnace under the pressure of MPa, firstly preserving the temperature at 400 ℃ for 10 hours, then heating to 1280 ℃ at the heating rate of 8 ℃/h, sintering for 100 minutes, cooling to 30 ℃ at the cooling rate of 25 ℃/h, and discharging. Turning the inner hole with visible light, preheating to 550 ℃, filling into a sand mold with a reserved space in advance, pouring core molten steel of low alloy steel, cooling to room temperature, and unpacking to form the roller.
Example 2
Waste steel scraps, forged steel heads, ferromolybdenum, ferrovanadium and electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is C1.83,Si 0.98,B 0.62,Mn 0.72,Cr 6.36,Ni 0.78,Mo 5.65,V 6.93,W 0.78,P which is less than or equal to 0.10%, S which is less than or equal to 0.1%, nb which is less than or equal to 1.0% and the balance Fe, the alloy raw materials are added into a planetary ball mill for ball milling, aviation kerosene is added for ball milling for 55 hours, liquid paraffin is added for 3.69%, filter paper is adopted for filtering, and then the mixture is put into a vacuum drying furnace for drying, the vacuum degree is 0.00025Pa, the drying temperature is 108 ℃, the drying time is 46 hours, and the mixture is cooled to 28 ℃ and discharged. Screening powder by using a 600-mesh screen, pressing by using a press machine to obtain a sample with a diameter of 715mm of a roll body and a 510mm of an inner hole, and vacuumizing to 10 -3 Sintering in a vacuum furnace under the pressure of MPa, firstly preserving heat for 10 hours at 430 ℃, then heating to 1290 ℃ at the heating rate of 7 ℃/h, sintering for 105 minutes, cooling to 25 ℃ at the cooling rate of 26 ℃/h, and discharging. Turning the inner hole with visible light, preheating to 560 ℃, filling into a sand mold with a reserved space in advance, pouring core molten steel of low alloy steel, cooling to room temperature, and unpacking to form the roller.
Example 3
The scrap steel, the forged steel stub bar, the ferromolybdenum, the ferrovanadium and the electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is less than or equal to 0.10 percent of C1.36,Si 0.99,B 0.69,Mn 0.73,Cr 5.36,Ni 0.69,Mo 7.69,V 7.93,W 0.79,P, less than or equal to 0.1 percent of S, less than or equal to 1.0 percent of Nb, and the balance of Fe. Adding into a planetary ball mill for ball milling, adding acetone for ball milling for 58 hours, adding 3.63% liquid paraffin, filtering by adopting filter paper, then placing into a vacuum drying furnace for drying, wherein the vacuum degree is 0.0002Pa, the drying temperature is 103 ℃, the drying time is 43 hours, and cooling to 29 ℃ for discharging. Screening powder by 600 mesh sieve, pressing sample by presser to obtain sample with roll diameter 723mm and inner hole 515mm, and vacuumizing to 3×10 -4 Sintering in a vacuum furnace under the pressure of MPa, firstly preserving the temperature at 425 ℃ for 9 hours, then heating to 1260 ℃ at the heating rate of 9 ℃/hour, sintering for 95 minutes, cooling to 28 ℃ at the cooling rate of 30 ℃/hour, and discharging. Turning the inner hole with visible light, preheating to 553 ℃, filling into a sand mold with a reserved space in advance, pouring core molten steel of low alloy steel, cooling to room temperature, and unpacking to form the roller.
Example 4
The scrap steel, the forged steel stub bar, the ferromolybdenum, the ferrovanadium and the electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is less than or equal to 0.10 percent of C1.66,Si 0.65,B 0.62,Mn 0.33,Cr 3.36,Ni 0.32,Mo 6.93,V 7.13,W 0.25,P, less than or equal to 0.1 percent of S, less than or equal to 1.0 percent of Nb, and the balance of Fe. Ball milling in planetary ball mill, ball milling in absolute alcohol for 60 hr, adding liquid paraffin 4.01%, filtering with filter paper, vacuum stoving in vacuum oven at vacuum degree of 0.0002Pa and temperature of 103 deg.c for 43 hr, cooling to 29 deg.c and discharging. Screening powder with 400 mesh sieve, pressing sample with presser to obtain sample with roller diameter 718mm and inner hole 521mm, and vacuumizing to 2×10 -4 Sintering in a vacuum furnace under MPa, firstly preserving heat for 9.5h at 426 ℃, then heating to 1290 ℃ at the heating rate of 9.5 ℃/h, sintering for 103min, and cooling to 31 ℃ at the cooling rate of 30 ℃/h, and discharging. Turning the inner hole with visible light, preheating to 552 ℃, filling into a sand mold with a reserved space in advance, pouring core molten steel of low alloy steel, cooling to room temperature, and opening the box to obtain the finished productThe shape is a roller.
Example 5
The scrap steel, the forged steel stub bar, the ferromolybdenum, the ferrovanadium and the electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is less than or equal to 0.10 percent of C1.73,Si 0.69,B 0.65,Mn 0.39,Cr 3.16,Ni 0.52,Mo 6.33,V 6.13,W 0.45,P, less than or equal to 0.1 percent of S, less than or equal to 1.0 percent of Nb, and the balance of Fe. Adding into a planetary ball mill for ball milling, adding aviation kerosene for ball milling for 55 hours, adding liquid paraffin for 3.65%, filtering by adopting filter paper, then placing into a vacuum drying furnace for drying, wherein the vacuum degree is 0.0001Pa, the drying temperature is 108 ℃, the drying time is 41 hours, and cooling to 23 ℃ and discharging. Screening powder with 500 mesh sieve, pressing sample with presser to obtain sample with roller diameter 790mm and inner hole 523mm, and vacuumizing to 5×10 -4 Sintering in a vacuum furnace under the MPa, firstly preserving the temperature at 423 ℃ for 8.5 hours, then heating to 1296 ℃ at the heating rate of 9.5 ℃/h, sintering for 116 minutes, cooling to 36 ℃ at the cooling rate of 28 ℃/h, and discharging. Turning the inner hole with visible light, preheating to 556 ℃, filling into a sand mold with a reserved space in advance, pouring core molten steel of low alloy steel, cooling to room temperature, and unpacking to form the roller.
Example 6
The scrap steel, the forged steel stub bar, the ferromolybdenum, the ferrovanadium and the electrode powder are used as alloy raw materials, the total composition of the alloy raw materials is less than or equal to 0.10 percent of C1.31,Si 0.80,B 0.61,Mn 0.53,Cr 4.1,Ni 0.32,Mo 4.33,V 5.13,W 0.35,P, less than or equal to 0.1 percent of S, less than or equal to 1.0 percent of Nb, and the balance of Fe. Ball milling in planetary ball mill, ball milling in absolute alcohol for 55 hr, adding liquid paraffin 3.51%, filtering with filter paper, vacuum stoving in vacuum oven at 161 deg.c and vacuum degree of 0.0001Pa for 43 hr, cooling to 26 deg.c and discharging. Screening powder by using 600 mesh sieve, pressing sample by using presser to obtain sample with diameter of 640mm and inner hole of 460mm, and vacuumizing to 6×10 -4 Sintering in a vacuum furnace under MPa, firstly preserving heat for 9.5h at 395 ℃, then heating to 1291 ℃ at the heating rate of 9.8 ℃/h, sintering for 113min, and cooling to 32 ℃ at the cooling rate of 26 ℃/h, and discharging. Turning the inner hole with visible light, preheating to 551 ℃, filling into a sand mould with a reserved space in advance, pouring core molten steel of low alloy steel, and coolingAnd cooling to room temperature, opening the box, and forming into a roller.
Example 7
Example 7 is a comparative example, and a high-speed steel roll produced by casting was produced in the same composition as example 6.
Example 8
Example 8 is a control example, a conventional high speed steel roll.
The products of examples 1 to 8 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
By performing performance test on the developed powder metallurgy roller, the wear resistance of the powder metallurgy roller is higher than that of the conventional high-speed steel, and the accident resistance of the powder metallurgy roller is obviously higher than that of the conventional high-speed steel working roller.
According to the performance detection result, the developed powder metallurgy roller has good wear resistance and accident resistance, can be well adapted to the working condition characteristics of the steel throwing of a rear section, particularly a finished product rack, in the actual use process, is suitable for the long-roller service rolling characteristics of a short-process rolling line, and has a machine cycle of more than 3 times of that of a conventional high-nickel-chromium working roller and more than 1.6 times of that of the conventional high-speed steel.
Claims (7)
1. A preparation method of a high-speed steel working roll is characterized by comprising the following steps: the alloy material ratio of the high-speed steel working roller is as follows: c:1.0 to 2.30 percent, si:0.5 to 2.0 percent, B:0.5-1.5%, mn:0.2 to 1.2 percent, P is less than or equal to 0.10 percent, S is less than or equal to 0.1 percent, cr:1.0-8.0%, ni:0.5-1.20%, mo:2.0-10.00%, V:2.00-10.00%, W:0.1-5.0%, nb is less than or equal to 1.0%, and the balance is Fe;
the preparation method comprises the following steps:
step A, placing the alloy materials in the proportion into a ball mill for ball milling;
the granularity of the alloy material in the step A is 2-3mm, a planetary ball mill is adopted, the liquid medium of the ball mill is one of absolute alcohol, acetone and aviation kerosene, and 3-5% of liquid paraffin is added at the same time;
step B, after ball milling, the vacuum degree is less than or equal to 10 -3 Heating and drying in a vacuum furnace of Pa, cooling to 30-50deg.C, grinding, sieving with a screen of 400 meshes or more, and pulverizing;
step C, preparing a sample blank by adopting a die, and compacting for later use;
step D, sintering by using a vacuum sintering furnace to prepare a powder metallurgy roller sleeve;
the sintering process in the step D is as follows: after the temperature is kept at 350-450 ℃ for 8-20h, the temperature is raised to the sintering temperature at the heating rate of 5-20 ℃/h, the sintering temperature is 1200-1300 ℃, the sintering time is 60-120min, and the temperature is lowered to the room temperature at the speed of 20-30 ℃/h after the sintering is finished;
step E, machining an inner hole of the powder metallurgy roller sleeve to remove blank defects, and preheating in a preheating furnace;
f, placing the preheated powder metallurgy roller sleeve in a sand mould, pouring core molten steel, solidifying and forming;
g, placing the cast blank in a heat treatment furnace for heat treatment;
and step H, processing and detecting until the finished product is obtained after the heat treatment is finished.
2. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: the ball grinding balls adopted in the step A are hard alloy balls, and the balls are: the material proportion is 10:1, and the ball milling time is 50-100h.
3. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: the drying temperature in the step B is 150-350 ℃ and the drying time is 40-80h; at the same time cooling the mixture until the vacuum degree is less than or equal to 10 -3 Mp is performed under the condition of Mp.
4. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: and C, compacting by adopting a cold isostatic pressing method.
5. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: and E, preheating at 500-600 ℃ for 10-20 hours.
6. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: and F, the core molten steel material in the step is an iron-based material with enough strength.
7. The method for manufacturing a high-speed steel work roll according to claim 1, wherein: and (C) annealing at 600-700 ℃ for 40-60h.
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| US4705565A (en) * | 1986-06-25 | 1987-11-10 | Beltz Robert J | High speed steel sintering powder made from reclaimed grinding sludge and objects sintered therefrom |
| US4880461A (en) * | 1985-08-18 | 1989-11-14 | Hitachi Metals, Ltd. | Super hard high-speed tool steel |
| JPH0978177A (en) * | 1995-09-20 | 1997-03-25 | Nippon Steel Corp | Production of material for rolling roll having excellent cracking resistance, and roll material for rolling |
| CN102766824A (en) * | 2012-07-04 | 2012-11-07 | 北京环渤湾高速钢轧辊有限公司 | Abrasion-resistant high-speed-steel roller ring and preparation method thereof |
| WO2020069795A1 (en) * | 2018-08-20 | 2020-04-09 | Höganäs Ab (Publ) | Composition comprising high melting iron alloy powder and modified high speed steel powder, sintered part and manufacturing method thereof, use of the high speed steel powder as additive for sintering |
| CN114381665A (en) * | 2021-12-23 | 2022-04-22 | 中钢集团邢台机械轧辊有限公司 | Medium-thickness plate high-speed steel working roll and manufacturing method thereof |
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2022
- 2022-06-23 CN CN202210724481.5A patent/CN115041686B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4880461A (en) * | 1985-08-18 | 1989-11-14 | Hitachi Metals, Ltd. | Super hard high-speed tool steel |
| US4705565A (en) * | 1986-06-25 | 1987-11-10 | Beltz Robert J | High speed steel sintering powder made from reclaimed grinding sludge and objects sintered therefrom |
| JPH0978177A (en) * | 1995-09-20 | 1997-03-25 | Nippon Steel Corp | Production of material for rolling roll having excellent cracking resistance, and roll material for rolling |
| CN102766824A (en) * | 2012-07-04 | 2012-11-07 | 北京环渤湾高速钢轧辊有限公司 | Abrasion-resistant high-speed-steel roller ring and preparation method thereof |
| WO2020069795A1 (en) * | 2018-08-20 | 2020-04-09 | Höganäs Ab (Publ) | Composition comprising high melting iron alloy powder and modified high speed steel powder, sintered part and manufacturing method thereof, use of the high speed steel powder as additive for sintering |
| CN114381665A (en) * | 2021-12-23 | 2022-04-22 | 中钢集团邢台机械轧辊有限公司 | Medium-thickness plate high-speed steel working roll and manufacturing method thereof |
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