CN108754068B - High-speed steel roll collar for high-speed wire pre-finish rolling and preparation method thereof - Google Patents

High-speed steel roll collar for high-speed wire pre-finish rolling and preparation method thereof Download PDF

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CN108754068B
CN108754068B CN201810553961.3A CN201810553961A CN108754068B CN 108754068 B CN108754068 B CN 108754068B CN 201810553961 A CN201810553961 A CN 201810553961A CN 108754068 B CN108754068 B CN 108754068B
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molten steel
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steel
roll collar
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CN108754068A (en
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张政龙
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Anhui Huanbowan High Speed Steel Mill Roll Co Ltd
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Anhui Huanbowan High Speed Steel Mill Roll Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52Manufacture of steel in electric furnaces
    • C21C5/5241Manufacture of steel in electric furnaces in an inductively heated furnace
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00Centrifugal casting; Casting by using centrifugal force
    • B22D13/04Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
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    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C35/00Master alloys for iron or steel
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    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
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    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/005Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/30Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

A high-speed steel roll collar for high-speed wire pre-finish rolling and a preparation method thereof belong to the technical field of casting. Smelting in an electric furnace, adding scrap steel, a carburant, ferromolybdenum, metal cobalt and ferrotungsten during the smelting process, adding ferrochromium after molten steel is melted down, raising the temperature of the molten steel in the furnace to 1607-.

Description

High-speed steel roll collar for high-speed wire pre-finish rolling and preparation method thereof
Technical Field
The invention discloses a high-speed steel roll collar and a preparation method thereof, particularly relates to a high-speed steel roll collar for high-speed wire pre-finish rolling and a preparation method thereof, and belongs to the technical field of casting.
Background
The pre-finishing mill group of the high-speed wire rod mill is formed by the differentiation and evolution of the two intermediate mill groups, and has the functions of continuously reducing the section of a rolled piece rolled by the rough intermediate mill group and providing an intermediate material which is correct in section shape, accurate in size, uniform in size along the full-length section and free of internal and surface defects for the finishing mill group, so that the precision of a finished wire rod is improved, and the faults of a finishing process are reduced. The important characteristics of the modern high-speed wire rod rolling mill are high rolling speed, high product quality and high equipment efficiency. Therefore, while finishing equipment is rapidly developing, pre-finishing mill groups are also continuously improving. In the later stage of the 20 th century and the 80 th century, in order to ensure that finished products with high dimensional accuracy and good surface quality are rolled by a finishing mill, a pre-finishing mill group is mainly arranged in a cantilever flat/vertical replacement mode, a rack structure is similar to that of the finishing mill, and a loop is arranged between racks for independent transmission. Later, in order to further improve the precision of semi-finished products, some high-speed wire rod rolling mills adopt 6 pre-finishing mills and adopt tungsten carbide roll rings made of high-hardness wear-resistant materials.
Chinese invention patent CN101994050 discloses a steel rolling cord line tungsten carbide roll collar formula, which comprises the following components in percentage by weight: 90.5-92.5% of WC, 3.5-4.5% of Co, 3.5-4.5% of Ni, 0.2-0.5% of TiC, 0.2-0.5% of CrC and 0.1-0.3% of VC. The invention has the advantages that: the raw material composition and the component proportion of the tungsten carbide roll collar are improved, the tungsten carbide roll collar has the internal condition of forming an internal organization structure meeting the use performance requirements, the rolling quantity of single-time high-carbon steel of a roller single groove can be greatly improved when the tungsten carbide roll collar is applied to the conditions that the pH value of water is alkaline and the water temperature is lower than 32 ℃, and compared with a tungsten carbide roll used in the same industry, the rolling quantity of the roll collar can be improved by more than one time. The Chinese invention patent CN101994051 also discloses a tungsten carbide roll collar formula, which can effectively solve the problems of low comprehensive performance and low rolling amount of the existing tungsten carbide roll collar. The formula of the tungsten carbide roll collar comprises the following components in percentage by weight: 93-98% of WC, 1.5-5% of Co, 0-4% of Ni, 0.2-0.3% of TiC, 0.2-0.3% of CrC, 0.05-0.3% of VC and 0.05-0.1% of Y. The invention has the advantages that: the raw material composition and the component proportion of the tungsten carbide roller are improved, so that the tungsten carbide roller has the inherent condition of forming an internal organization structure meeting the use performance requirements, the roller ring abrasion loss is small, the surface is smooth and does not break the roller, the service cycle is long, the roller changing times are few, the roller changing workload is reduced, the cost is reduced, the operation rate and the product yield of a rolling mill are improved, and the inherent quality and the surface quality of a produced wire rod product are ensured. The Chinese patent CN105671402 also discloses a high-speed wire hard alloy roll collar which is prepared from the following components in percentage by weight: 12-18% of nickel powder, 8-12% of cobalt powder, 0.1-0.3% of vanadium carbide powder, 0.2-0.6% of chromium carbide powder, 0.8-1% of neodymium powder and the balance of spherical tungsten carbide powder, wherein the average grain size of the spherical tungsten carbide powder is 5-6 um. The invention relates to a rolling mill roll collar for rolling steel, which can solve the problem that the existing hard alloy roll is easy to crack. The Chinese invention patent CN 105568107 also discloses a manufacturing method of the high-speed wire roller ring, which comprises the following steps: the components in percentage by weight are as follows: 12-18% of nickel powder, 8-12% of cobalt powder, 0.1-0.3% of vanadium carbide powder, 0.2-0.6% of chromium carbide powder, 0.8-1% of neodymium powder and the balance of spherical tungsten carbide powder, wherein the average grain size of the spherical tungsten carbide powder is 5-6 um; mixing the raw materials in the proportion with absolute ethyl alcohol, grinding the mixture in a ball mill for 10-14h, putting the ground mixture in a mould, compacting the mixture by ultrasonic oscillation, and pressing at 500-700MPa to prepare a green compact; and putting the pressed compact into a sintering furnace, heating to 1400-1480 ℃, preserving the heat for 50-80 minutes, and cooling to room temperature along with the furnace to obtain the high-strength high-toughness high-temperature-resistant high. The invention solves the problem that the prior hard alloy high-speed wire roll collar is easy to crack. The Chinese invention patent CN 106011605 also discloses a hard alloy roll collar, which comprises a roll collar seat and a hard alloy ring, wherein the roll collar seat is prepared from the following raw materials in parts by weight: 60-70 parts of iron powder, 15-26 parts of silicon powder, 20-30 parts of carbon powder, 6-10 parts of copper powder, 11-17 parts of chromium powder, 9-18 parts of nickel powder, 3-7 parts of molybdenum powder, 6-15 parts of a slag remover and 2-6 parts of a nodulizer; the hard alloy ring is prepared from the following raw materials in parts by weight: 50-65 parts of tungsten carbide powder, 30-42 parts of cobalt powder, 17-28 parts of nickel powder, 25-38 parts of titanium carbide powder and 11-20 parts of chromium powder. The roll ring seat is connected with the hard alloy ring through welding. Compared with the prior art, the roller ring seat and the hard alloy ring have high bonding strength. The Chinese patent CN106119679 also discloses a preparation method of a hard alloy roll collar, which comprises a roll collar seat and a hard alloy ring, wherein the roll collar seat is prepared from the following raw materials: iron powder, silicon powder, carbon powder, copper powder, chromium powder, nickel powder, molybdenum powder, a deslagging agent and a nodulizing agent; the hard alloy ring is prepared from the following raw materials: tungsten carbide powder, cobalt powder, nickel powder, titanium carbide powder and chromium powder; the preparation method comprises the following preparation steps: A. mounting a roll collar seat on a base of a laser welding machine for fixing; B. sleeving a hard alloy ring with the diameter larger than that of the roll ring seat on the outer side of the roll ring seat; C. adjusting the base according to the position of the indicating point of the laser beam to enable the joint of the hard alloy and the roller ring seat to be at the indicating point; D. laser welding is carried out on the joint of the hard alloy ring and the roller ring seat; E. and (5) placing the mixture in a temperature circulating box for circulation, and obtaining the product after the circulation is finished. Compared with the prior art, the invention solves the problem of low bonding strength.
Although the tungsten carbide roll collar has excellent wear resistance, the manufacturing cost is too high, and the tungsten carbide roll collar has high brittleness and is easy to crack in the using process. In order to improve the performance of the roll collar, the Chinese invention patent CN1424423 discloses a high-speed steel roll collar used for various wire rolling mills and bar rolling mills and a manufacturing method thereof, and the chemical components (weight percent) are as follows: c: 1.2 to 3.0; w: 2.0 to 6.0; mo: 3.0 to 8.0; v: 1.0 to 10.0; cr: 4.5 to 12.0; al: 0.4 to 1.5; n i: 0.3 to 1.5; co: 0.5 to 10.0; nb: 0.5 to 5.0; ti: 0.1 to 1.0; ce: 0.05 to 0.30; na: 0.05 to 0.30; m g: 0.005 to 0.025; si is less than 1.5; mn is less than 1.5; s is less than 0.05; p is less than 0.05; the balance being Fe. The roll collar is formed by adopting an electric furnace smelting and centrifugal casting method, and is annealed, quenched at high temperature and tempered twice. The hardness is more than 65HRC, the red hardness at 600 ℃ is more than 60 HRC, and the tensile strength is 900-1050 Mpa. The chinese invention patent CN 101596553 also discloses a high-speed steel roll collar applied to a high-speed wire rolling mill and a manufacturing method thereof, wherein the chemical components (mass fraction%): 3.0-3.5C, 5.0-7.0V, 4.2-4.5 Cr, 9.0-10.0 Mo, 5.5-8.0 Co, 0.4-1.0 Al, 1.5-4.0 Nb, 0.10-0.25 Ti, 0.003-0.006B, 0.08-0.25 RE, 0.06-0.12 Zr, < 0.8Si, < 1.0Mn, and the balance of iron and inevitable trace impurities. The roll collar of the invention is cast on a centrifugal casting machine after smelting and modification treatment. The roll collar is subjected to rough machining after annealing, is subjected to finish machining after quenching and tempering, has the characteristics of high hardness, good red hardness and the like, and has excellent wear resistance when used on a high-speed wire rod mill. The Chinese invention patent CN102766824 also discloses a wear-resistant high-speed steel roll collar and a preparation method thereof, belonging to the technical field of high-speed steel roll collars. The chemical composition thereof is as follows by mass percent: 2.6-3.2C, 14.5-15.0W, 2.5-3.0 Mo, 1.5-2.0V, 4.0-4.5 Cr, 4.5-5.0 Co, 6.2-6.8 Nb, 0.5-0.8 Ni, 0.15-0.20B, 0.25-0.40 Al, 0.07-0.10Y, 0.04-0.06 Ti, 0.08-0.12N, 0.04-0.07 Ca, 0.020-0.035 Zr, 0.08-0.11 Mg, 0.12-0.15 Zn, 0.5-1.2 Si, 0.20-0.45 Mn, S is less than or equal to 0.02, P is less than or equal to 0.03, and the balance is Fe. Centrifugal casting is adopted. The roll collar has high hardness and good wear resistance.
The Chinese patent CN103757547 also discloses a cast steel material for a composite roll collar, which comprises the following chemical element components by mass percent: 0.8 to 0.9 percent of carbon, 1.2 to 1.5 percent of tungsten, 1.5 to 2.5 percent of molybdenum, 1.5 to 2.5 percent of vanadium, 2.2 to 2.5 percent of chromium, 0.05 to 0.10 percent of niobium, 0.1 percent of rare earth, 0.004 to 0.007 percent of Mg0.02 to 0.05 percent of Al0.030 percent of P, 0.030 percent of S and the balance of iron. According to the invention, multiple alloy elements such as rare earth, Al, niobium and the like are added on the basis of high-carbon steel, secondary refining is carried out, the heat treatment temperature after casting is reasonably controlled, and raw materials are put in batches, so that the alloy steel has the characteristics of high-speed steel, is relatively high in red hardness, good in rigidity and toughness matching, good in wear resistance, high in hardness and impact resistance, suitable for a roll collar of a roll of a wire machine, relatively low in cost and durable. The invention uses part of scrap iron as raw material, so that the alloy quality is stable and uniform. The Chinese patent CN105420629 also discloses a high-plasticity roller ring made of hard materials suitable for high-speed wire rod rolling and a manufacturing method thereof, wherein the material comprises the following chemical components in percentage by weight: c: 4-5.5%, Re: 0.04-0.1%, W: 6-18%, Mo: 3-5%, Cr: 4-6%, Ni: 0.5-2%, V: 6-8%, S is less than or equal to 0.035%, P is less than or equal to 0.035%, and the balance is Fe. The manufacturing method adopts the heat treatment process of electric furnace smelting, centrifugal casting, spheroidizing annealing, quenching and multiple tempering. The technical innovation points of the high-plasticity hard material roll collar mainly focus on two aspects of material innovation and process innovation, and the roll collar has excellent wear resistance and higher toughness and matching. The method is mainly used for replacing the common cast iron roll collar and the WC roll collar which are widely used in the steel rolling field of the domestic metallurgical industry at present, prolonging the service life cycle of the roll collar and improving the operating rate of the high-speed wire rod rolling mill.
However, various common wear-resistant alloy roll collars developed at present generally have the defects of poor high-temperature stability, low high-temperature wear resistance and the like compared with tungsten carbide roll collars.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention adds aluminum and cobalt elements into high-speed steel to improve the high-temperature stability of a matrix, and adds high-hardness V in the centrifugal casting process0.2Nb0.8And C, powder.
The preparation process of the high-speed steel roll collar by high-speed wire pre-finish rolling adopts electric furnace smelting, and the specific preparation process comprises the following steps:
①, firstly using a recarburizer, metallic cobalt, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and metallic aluminum as burden materials, adopting an electric furnace for smelting, firstly adding the scrap steel, the recarburizer, the ferromolybdenum, the metallic cobalt and the ferrotungsten during the smelting process, adding ferrochromium after molten steel is completely molten, controlling the chemical composition and the mass fraction of molten steel in the furnace to be 2.53-2.79% of C, 5.14-5.47% of Co, 15.67-15.81% of Mo, 1.03-1.40% of W, 5.51-5.85% of Cr, 0.60% of Si, 0.50% of Mn, 0.035% of P, 0.032% of S and the balance of Fe, raising the temperature of molten steel in the furnace to 1607-1625 ℃, adding metallic aluminum accounting for 0.8-0.9% of the mass fraction of molten steel in the furnace, preserving heat for 4-6 minutes, adding barium-163800 ℃ of 100 ℃, preheating 15 mm, 22 mm-15 mm of calcium-15 mm of silicon and 30 mm of molten steel accounting for 0.3-30 mm of TiN-30 mm of silicon, adding barium-5 mm of silicon and vanadium-5 mm of silicon in the molten steel in the furnace, adding barium-30 mm of the molten steel in the molten steel to 1633-30 mm of the calcium-30 mm of the slag and vanadium-30 mm of the calcium-28-20 mm of the slag in the slag, respectively after heat preservation for 4-6-30 mm of the barium-30 mm of the slag and vanadium;
② after the molten steel in the ① ladle is deslagged and stood, when the temperature is reduced to 1477-0.2Nb0.8C powder, V0.2Nb0.8C, the adding amount of the powder accounts for 3.8-4.0% of the mass fraction of molten steel entering the casting mold, after the molten steel is solidified, the centrifugal machine is stopped, the casting is taken out to obtain a high-speed steel roll ring blank, and the high-speed steel roll ring blank is directly subjected to rough machining after being subjected to sand cleaning and polishing;
③ heating the roughly processed high-speed steel roller ring to 1065-.
The chemical composition and the mass fraction of the heavy rare earth silicon-calcium-barium alloy are 8.24-8.71 percent of Y,28.16-30.09 percent of Si,8.91-9.45 percent of Ca,9.62-9.90 percent of Ba, less than or equal to 0.8 percent of C, less than or equal to 0.04 percent of P, less than or equal to 0.06 percent of S and the balance of Fe.
The chemical composition and the mass fraction of the ferrovanadium are 78.41-81.73% V, less than or equal to 0.30% C, less than or equal to 1.50% Si, less than or equal to 0.08% P, less than or equal to 0.06% S, less than or equal to 2.0% Al, less than or equal to 0.50% Mn and the balance Fe.
The high-speed steel roll collar for high-speed wire pre-finish rolling is smelted by an electric furnace, the smelting process is simple, and the component control precision is high. The furnace burden materials are prepared from carburant, metallic cobalt, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and metallic aluminum, are convenient to obtain and are purchased at home. In order to improve the smelting efficiency of the molten steel, when the molten steel is smelted by an electric furnace, scrap steel, a carburant, ferromolybdenum, metal cobalt and ferrotungsten are added in the smelting process, so that the burning loss of alloy elements can be reduced. In addition, the ferrochrome is added after the molten steel is melted down, so that the oxidation and burning loss of chromium elements are prevented. Controlling the chemical composition and the mass fraction of the molten steel in the furnace to be 2.53-2.79 percent of C,5.14-5.47 percent of Co,15.67-15.81 percent of Mo,1.03-1.40 percent of W,5.51-5.85 percent of Cr,<0.60%Si,<0.50%Mn,<0.035%P,<0.032% S, and the balance Fe. The invention is characterized in that 2.53-2.79% of C is added, and the aim is that the carbon is combined with alloy elements to generate high-hardness alloy carbide for improving the wear resistance of the high-speed steel roll collar. In addition, 15.67-15.81% of Mo is added, which mainly improves the high-temperature red hardness of the roll collar, and the large amount of Mo is added, which can also improve the uniformity of carbide distribution and is beneficial to improving the obdurability of the high-speed steel roll collar. The tungsten element has high density, is added into a high-speed steel roll collar excessively and is easy to be added into a centrifugal casting processSerious segregation occurs, and the comprehensive performance of the roll collar is reduced. 5.51-5.85% Cr is added to improve the high-temperature oxidation performance of the high-speed steel roll collar, chromium-containing carbide is easy to dissolve into a matrix in the high-temperature quenching process, and M is easy to separate out in the tempering process23C6The carbide is beneficial to improving the microhardness of the matrix, thereby improving the wear resistance of the high-speed steel roll collar.
The cobalt and the aluminum are non-carbide forming elements and are mainly dissolved in the matrix in a solid mode, so that the high-temperature hardness of the matrix can be greatly improved, and the high-temperature wear resistance of the high-speed steel roll collar is obviously improved. However, aluminum element is very easy to oxidize when added into molten steel, is not well controlled, brings about a lot of inclusions, but damages the mechanical properties of high-speed steel, and particularly greatly reduces the strength and toughness of the high-speed steel. In order to overcome the adverse effect brought by adding aluminum element, the invention raises the temperature of the molten steel in the furnace to 1607-. Thus, ferrovanadium can be ensured to be rapidly melted into molten steel, and the burning loss of vanadium element is obviously reduced. And then the temperature of the molten steel is increased to 1631-1649 ℃, and the molten steel is taken out of the furnace and is put into a steel ladle, the heavy rare earth silicon-calcium-barium alloy with the particle size of 3-6mm multiplied by 3-6mm and the TiN particles with the particle size of 200-250 meshes are added into the steel ladle in advance, and the adding amounts of the heavy rare earth silicon-calcium-barium alloy and the TiN particles respectively account for 0.35-0.40 percent and 0.25-0.30 percent of the mass fraction of the molten steel entering the steel ladle. Adding 0.35-0.40% of heavy rare earth silicon calcium barium alloy by mass fraction, and controlling the chemical composition and the mass fraction of the heavy rare earth silicon calcium barium alloy as follows: 8.24 to 8.71 percent of Y,28.16 to 30.09 percent of Si,8.91 to 9.45 percent of Ca,9.62 to 9.90 percent of Ba, less than or equal to 0.8 percent of C, less than or equal to 0.04 percent of P, less than or equal to 0.06S, and the balance of Fe. The addition of the heavy rare earth Y can deoxidize and desulfurize, is beneficial to refining solidification structure, and has good effect on improving the form and distribution of carbide. And the addition of Ca has good effect on improving the shape and distribution of inclusions in the steel. The addition of Ba has good deoxidation and desulfurization effects, promotes the floating of inclusions in molten steel, and also has good degassing effects. Titanium nitride (TiN) has a typical NaCl-type structure, belonging to a face-centered cubic lattice with a lattice constant a of 0.4241nm, in which the titanium atoms are located at the vertices of the face-centered cubic. TiN is a non-stoichiometric compound, the stable composition range of the TiN is TiN0.37-TiN1.16, the nitrogen content can be changed within a certain range without causing the change of the TiN structure, the TiN melting point is high and reaches 2950 ℃. TiN accounting for 0.25-0.30 percent of the mass fraction of molten steel entering a ladle is added into molten steel, so that the refinement of the solidification structure of the high-speed steel roll collar and the broken net and isolated distribution of carbide can be promoted, and the strength and the toughness of the high-speed steel roll collar are greatly improved. In addition, TiN has high hardness, and can improve the wear resistance of the roll collar when entering the matrix.
After the molten steel in the ladle is subjected to slag skimming and standing, when the temperature is reduced to 1477-. The roll collar is produced by a centrifugal casting method, the microstructure of the roll collar is compact, and the production efficiency is high. However, in the centrifugal casting process of producing a high-speed steel roll collar, elements and carbides having low densities are segregated to the inner layer of the roll collar due to the centrifugal force, while elements and carbides having high densities are segregated to the outer surface of the roll collar, resulting in non-uniform performance of the roll collar. In order to further improve the wear resistance of the high-speed steel roll collar, V of 120-160 meshes accounting for 3.8-4.0 percent of the mass fraction of molten steel entering a casting mold is poured along with the molten steel in the molten steel pouring process0.2Nb0.8C powder, V0.2Nb0.8The density of C is close to that of molten steel, segregation does not occur in the centrifugal casting process, and the comprehensive performance of the high-speed steel roll collar is greatly improved. And after the molten steel is solidified, stopping the centrifuge, taking out the casting to obtain a high-speed steel roll collar blank, and directly performing rough machining on the high-speed steel roll collar blank after sand removal and polishing.
The invention heats the roughly processed high-speed steel roll collar to 1065-. When the temperature of the roll surface is reduced to 460 ℃ of 400-. When the temperature of the roller surface of the roller ring is 320-360 ℃, the high-speed steel roller ring is continuously heated to 550-565 ℃ along with the furnace, the temperature is kept for 5-6 hours, the furnace is cooled to the temperature lower than 150 ℃, and the roller ring is taken out of the furnace and cooled to room temperature by air, so that the internal stress of the roller ring is mainly eliminated, the structure is stabilized, and the roller ring is prevented from cracking in use. And finally, performing finish machining to specified size and precision to obtain the high-speed steel roll collar with excellent performance for high-speed wire pre-finish rolling.
Compared with the prior art, the invention has the following advantages:
1) the roll collar has high hardness which reaches 88-91HSD and has excellent wear resistance;
2) the red hardness of the roll collar is good and reaches 80-83HSD at 600 ℃;
3) the roll collar has excellent wear resistance, is used on a high-speed wire mill pre-finishing mill group, has the service life prolonged by over 600 percent compared with a high-nickel-chromium cast iron roll collar, is equivalent to a hard alloy roll collar, has the production cost of only 40 to 43 percent of the hard alloy roll collar, and has good economic and social benefits when popularized and applied.
Detailed Description
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.
Example 1:
the high-speed steel roll ring for high-speed wire pre-finish rolling is smelted by adopting a 1000 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
①, adding a recarburizer, metallic cobalt, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and metallic aluminum to a charging material, smelting by adopting a 1000 kg medium frequency induction furnace, adding the scrap steel, the recarburizer, the ferromolybdenum, the metallic cobalt and the ferrotungsten during the smelting process, adding ferrochromium after molten steel is completely molten, controlling the chemical composition and the mass fraction of molten steel in the furnace to be 2.53% of C, 5.47% of Co, 15.67% of Mo, 1.40% of W, 5.51% of Cr, 0.53% of Si, 0.39% of Mn, 0.033% of P, 0.026% of S and the balance Fe, raising the temperature of the molten steel in the furnace to 1607 ℃, adding the metallic aluminum accounting for 0.8% of the mass fraction of the molten steel in the furnace, keeping the temperature for 6 minutes, adding the ferrovanadium which is preheated for 120 minutes at 750 ℃, has the particle size of 15-22mm × 15-22mm × 15-22mm × 15-22mm, the molten steel is added with the chemical composition and the mass fraction of V, the mass fraction of the molten steel is 78.41% of V, 0.21.21% of C, the calcium, the molten steel is added in the molten steel, the molten steel is added in the molten steel, the molten;
② after slagging off and standing the molten steel in ① steel ladle, when the temperature is reduced to 1477 ℃, pouring the molten steel into a casting mould on a centrifugal casting machine rotating at high speed, and pouring V of 120 meshes and 160 meshes along with the molten steel flow in the molten steel pouring process0.2Nb0.8C powder, V0.2Nb0.8C, the adding amount of the powder accounts for 3.8 percent of the mass fraction of molten steel entering the casting mold, after the molten steel is solidified, the centrifugal machine is stopped, the casting is taken out to obtain a high-speed steel roll ring blank, and the high-speed steel roll ring blank is directly subjected to rough machining after sand removal and polishing;
③ heating the high speed steel roll collar to 1070 deg.C, keeping the temperature for 2.5 h, spray cooling, controlling the cooling speed at 29-31 deg.C/min, cooling to 450 deg.C, heating to 560 deg.C, keeping the temperature for 3.5 h, air cooling to 345 deg.C, heating to 560 deg.C, keeping the temperature for 5.5 h, cooling to 150 deg.C, and fine machining to required size and precision to obtain high speed steel roll collar.
Example 2:
the high-speed steel roll ring for high-speed wire pre-finish rolling is smelted by adopting a 500 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
① smelting by using carburant, cobalt metal, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and aluminum metal charge materials, adding scrap steel, carburant, ferromolybdenum, cobalt metal and ferrotungsten during smelting, adding ferrochromium after molten steel is completely molten, controlling the chemical composition and the mass fraction of molten steel in the furnace at 2.79% of C, 5.14% of Co, 15.81% of Mo, 1.03% of W, 5.85% of Cr, 0.49% of Si, 0.43% of Mn, 0.030% of P, 0.031% of S and the balance Fe, raising the temperature of molten steel in the furnace to 1625 ℃, adding aluminum metal accounting for 0.9% of the mass fraction of molten steel in the furnace, preserving heat for 4 minutes, adding ferrovanadium with the grain size of 15-22mm × 15-22mm after preheating for 100 minutes at 800 ℃, adding ferrovanadium with the chemical composition and the mass fraction of V, 0.73% of V, 0.26% of C, 0.97% of Si, 0.7% of grain size of TiN, 0.9-0.9% of Si, 0.9% of calcium alloy, adding calcium alloy in the furnace, adding barium alloy, calcium alloy;
② after skimming and standing the molten steel in ① steel ladle, when the temperature is reduced to 1495 ℃, pouring the molten steel into a casting mould on a centrifugal casting machine rotating at a high speed, and pouring V of 120 meshes and 160 meshes along with the molten steel flow in the molten steel pouring process0.2Nb0.8C powder, V0.2Nb0.8C, the adding amount of the powder accounts for 4.0 percent of the mass fraction of molten steel entering the casting mold, after the molten steel is solidified, the centrifuge is stopped, the casting is taken out to obtain a high-speed steel roll ring blank, and the high-speed steel roll ring blank is directly subjected to rough machining after sand removal and polishing;
③ heating the high speed steel roll ring to 1065 deg.C, keeping the temperature for 3h, spray cooling, controlling the cooling speed at 30-32 deg.C/min, cooling to 460 deg.C, heating to 540 deg.C, keeping the temperature for 4h, cooling to 360 deg.C, heating to 550 deg.C, keeping the temperature for 6 h, cooling to 150 deg.C, cooling to room temperature, and finishing to required size and precision to obtain high speed steel roll ring with high speed steel pre-finish rolling, whose mechanical properties are shown in Table 1.
Example 3:
the high-speed steel roll ring for high-speed wire pre-finish rolling is smelted by adopting 1500 kg of medium-frequency induction furnace, and the specific preparation process comprises the following steps:
① smelting by using carburant, metallic cobalt, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and metallic aluminum, adding ferrochromium after melting down the molten steel, controlling the chemical composition and the mass fraction of the molten steel in the furnace at 2.64% C, 5.31% Co, 15.74% Mo, 1.28% W, 5.75% Cr, 0.59% Si, 0.44% Mn, 0.032% P, 0.029% S and the balance Fe, raising the temperature of the molten steel in the furnace to 1614 ℃, adding metallic aluminum accounting for 0.85% of the mass fraction of the molten steel in the furnace, preserving heat for 5 minutes, adding ferrovanadium which is preheated at 780 ℃ for 110 minutes, has the particle size of 15-22mm × 15-22mm × 15-22mm, the chemical composition and the mass fraction of ferrovanadium of 80.13% V, 0.25% C, 1.06% Si, 0.056% Si, 0.048% Ca and 0.048% Si, adding the molten steel into the furnace, adding barium-Si, calcium alloy which accounts for 80.049% of the weight fraction of the molten steel, adding calcium-3.048% of the molten steel and calcium-3.048% of the molten steel, adding barium-3.9% Si, adding calcium-29% of the molten steel and calcium-3% Si, the balance Fe and aluminum alloy in the molten steel in the furnace, adding barium-29.048% of the molten steel to the molten steel after adding the molten steel to the furnace, the molten steel to the furnace, the balance Fe, the molten steel to the furnace, the molten steel to the balance Fe, the molten steel to;
② after slagging off and standing the molten steel in ① steel ladle, when the temperature is reduced to 1486 ℃, pouring the molten steel into a casting mould on a centrifugal casting machine rotating at high speed, and pouring V with the size of 120 meshes and 160 meshes along with the molten steel flow in the molten steel pouring process0.2Nb0.8C powder, V0.2Nb0.8The addition of the powder C accounts for 3.9 percent of the mass fraction of the molten steel entering the casting mold, after the molten steel is solidified,stopping the centrifuge, taking out the casting to obtain a high-speed steel roll collar blank, and directly performing rough machining on the high-speed steel roll collar blank after sand removal and polishing;
③ heating the high-speed steel roll collar to 1080 ℃ along with the furnace, preserving heat for 2 hours, then spray cooling, controlling the cooling speed of the high-speed steel roll collar at 28-30 ℃/min, immediately putting the high-speed steel roll collar into the furnace to heat to 570 ℃ when the roll surface temperature is reduced to 400-.
TABLE 1 high speed Steel roll Ring mechanical Properties
The hardness of the roll collar is high and reaches 88-91HSD, the red hardness of the roll collar is good, and the red hardness at 600 ℃ reaches 80-83 HSD. In addition, the roll collar has high strength and good toughness, is used on a high-speed wire mill pre-finishing mill group, has the service life prolonged by over 600 percent compared with a high-nickel-chromium cast iron roll collar, is equivalent to a hard alloy roll collar, and has the production cost of only 40 to 43 percent of the hard alloy roll collar. The roller ring overcomes the defect that the hard alloy roller ring is easy to crack and peel in use. The roll collar of the invention is popularized and applied, the consumption of the roll collar and the purchasing fund of the roll collar can be reduced, the operation rate of a rolling mill is improved, the labor intensity of workers is reduced, and the invention has good economic and social benefits.

Claims (4)

1. A preparation method of a high-speed steel roll collar for high-speed wire pre-finish rolling is characterized in that electric furnace smelting is adopted, and the specific preparation method comprises the following steps:
①, firstly using a recarburizer, metallic cobalt, ferromolybdenum, ferrotungsten, ferrochromium, ferrovanadium, scrap steel and metallic aluminum as burden materials, adopting an electric furnace for smelting, firstly adding the scrap steel, the recarburizer, the ferromolybdenum, the metallic cobalt and the ferrotungsten during the smelting process, adding ferrochromium after molten steel is completely molten, controlling the chemical composition and the mass fraction of molten steel in the furnace to be 2.53-2.79% of C, 5.14-5.47% of Co, 15.67-15.81% of Mo, 1.03-1.40% of W, 5.51-5.85% of Cr, 0.60% of Si, 0.50% of Mn, 0.035% of P, 0.032% of S and the balance of Fe, raising the temperature of molten steel in the furnace to 1607-1625 ℃, adding metallic aluminum accounting for 0.8-0.9% of the mass fraction of molten steel in the furnace, preserving heat for 4-6 minutes, adding barium-163800 ℃ of 100 ℃, preheating 15 mm, 22 mm-15 mm of calcium-15 mm of silicon and 30 mm of molten steel accounting for 0.3-30 mm of TiN-30 mm of silicon, adding barium-5 mm of silicon and vanadium-5 mm of silicon in the molten steel in the furnace, adding barium-30 mm of the molten steel in the molten steel to 1633-30 mm of the calcium-30 mm of the slag and vanadium-30 mm of the calcium-28-20 mm of the slag in the slag, respectively after heat preservation for 4-6-30 mm of the barium-30 mm of the slag and vanadium;
② after the molten steel in the ① ladle is deslagged and stood, when the temperature is reduced to 1477-0.2Nb0.8C powder, V0.2Nb0.8C, the adding amount of the powder accounts for 3.8-4.0% of the mass fraction of molten steel entering the casting mold, after the molten steel is solidified, the centrifugal machine is stopped, the casting is taken out to obtain a high-speed steel roll ring blank, and the high-speed steel roll ring blank is directly subjected to rough machining after being subjected to sand cleaning and polishing;
③ heating the roughly processed high-speed steel roller ring to 1065-.
2. The method for preparing the high-speed steel roll collar for high-speed wire pre-finish rolling of claim 1, wherein the chemical composition and the mass fraction of the heavy rare earth silicon-calcium-barium alloy are 8.24-8.71% of Y, 28.16-30.09% of Si, 8.91-9.45% of Ca, 9.62-9.90% of Ba, less than or equal to 0.8% of C, less than or equal to 0.04% of P, less than or equal to 0.06% of S and the balance of Fe.
3. The method for preparing the high-speed steel roll collar for high-speed wire pre-finish rolling according to claim 1, wherein the chemical composition and the mass fraction of the ferrovanadium are 78.41-81.73% V, less than or equal to 0.30% C, less than or equal to 1.50% Si, less than or equal to 0.08% P, less than or equal to 0.06% S, less than or equal to 2.0% Al, less than or equal to 0.50% Mn, and the balance Fe.
4. A high speed steel ring for high speed pre-planishing manufactured by the method according to any one of claims 1 to 3.
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