CN109825773B - Thick-wall high-speed steel wear-resistant roll collar and preparation method thereof - Google Patents
Thick-wall high-speed steel wear-resistant roll collar and preparation method thereof Download PDFInfo
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Abstract
A thick-wall high-speed steel wear-resistant roll collar and a preparation method thereof belong to the technical field of roll collar manufacturing. Smelting molten steel by an electric furnace, controlling the chemical composition and the mass fraction of the high-speed molten steel to be 1.63-1.72% of C, 0.27-0.35% of Si, 0.25-0.34% of Mn, < 0.030% of S, < 0.025% of P, 12.52-12.79% of Cr, 1.51-1.69% of Mo, 6.71-6.94% of W, 2.37-2.49% of V, 5.32-5.48% of Co, 1.03-1.24% of Nb and the balance of Fe and other inevitable impurities, then respectively adding multi-element alloy additive particles and a horizontal cored wire, casting and molding on a centrifuge, and after heat treatment, the roller ring has compact structure, no looseness and excellent wear resistance.
Description
Technical Field
The invention discloses a high-speed steel wear-resistant roll collar and a preparation method thereof, particularly relates to a thick-wall high-speed steel wear-resistant roll collar and a preparation method thereof, and belongs to the technical field of roll collar manufacturing.
Background
The roll collar is an important spare part for rolling seamless steel tubes, large bars and H-shaped steel on a steel tube rolling mill, a large bar rolling mill and a large section rolling mill, and for a long time, the thick-wall roll collar in China is generally made of semi-steel, ductile iron, medium carbon alloy steel and the like, and has the defects of low hardness, poor hardenability, short service life of the roll collar and the like. The hard alloy roll collar is used in part of rolling mills, and has the defects of high roll collar brittleness, easy cracking in use, high roll collar manufacturing cost and the like.
In order to further improve the performance of the thick-wall roll collar, the Chinese invention patent CN 109182720 discloses a heat treatment method of a large-scale ductile iron roll collar, which comprises the improvement of normalizing and tempering processes, and the roll collar comprises the following chemical components: c: 3.2 to 3.5 percent; si: 1.7-1.9%; mn: 0.7-0.8%; p: 0 to 0.08 percent; s: 0 to 0.015 percent; cr: 0.8-0.9%; ni: 1.5 to 2.0 percent; mo: 0.3 to 0.5 percent; the balance of Fe; through the improvement of normalizing and tempering processes and the adjustment of chemical components of the matched roll collar, the problem of cracking of the large roll collar in the heating process of heat treatment is effectively solved, an effective heat treatment method is provided for the manufacturing process of the large roll collar, and the production risk and the production cost are reduced. The Chinese invention patent CN 108823392 also discloses a heat treatment process for the wide-diameter H-shaped steel roll collar, which makes a technical breakthrough for the manufacture of the wide-diameter H-shaped roll collar (phi 1600), provides related manufacturing process parameters, and the prepared wide-diameter H-shaped roll collar has better hardness, core carbide and mechanical properties; firstly, spheroidizing is carried out, and then, a cold working cutting ring is transferred, because the utilization rate of a blank is only 50-60%, a large amount of excess materials and a protective layer are removed after the cold working cutting ring is passed, the thickness of a workpiece is reduced, and the subsequent high-temperature diffusion treatment link is facilitated; the time of the high-temperature diffusion link is originally 12 hours to complete; after the ring is cut in a cold working mode, a large amount of excess materials are not consumed, so that the energy consumption of high-temperature diffusion is effectively reduced, the heat transfer effect is better, the temperature equalizing time is short, the link of high-temperature diffusion can be completed in 5-8 hours totally, the time is shortened by a large amount, the diffusion is more sufficient, and the quality of matrix tissues is better. The Chinese patent CN 108677083 also discloses a method for producing the alloy roll collar for producing the hot-rolled seamless steel tube. The alloy roll collar is composed of an outer layer and an inner layer which are of a centrifugal composite structure, wherein the outer layer of the roll collar is made of high-manganese molybdenum cast iron, and the inner layer of the roll collar is made of graphite steel. The production method of the alloy roll collar adopts a centrifugal composite casting process, and the process scheme also comprises the following steps: spraying of centrifugal cold type coating, smelting and modification treatment of molten metal, centrifugal casting, pit heat preservation and heat treatment. The working layer is made of high-manganese molybdenum cast iron, and the characteristics of high-hardness and high-strength carbide elements of manganese and the high toughness and wear resistance of molybdenum are fully utilized, so that the high-strength, high-wear resistance and cold and hot fatigue resistance of the high-manganese molybdenum cast iron are realized, the production cost is reduced by 10-15% compared with that of a common pearlite and bainite roll collar, the service life of the high-manganese molybdenum cast iron can be prolonged by 2-3 times, and the high-manganese molybdenum cast iron can replace the traditional pearlite and bainite roll collar. The Chinese invention patent CN 106011444 also discloses a heat treatment process for the H-shaped steel roll collar, which comprises the following steps: after the H-shaped steel roll collar is formed, opening the box in a hot mode, and performing heat treatment; spheroidizing; cold-turning and ring-cutting treatment; high-temperature diffusion treatment; normalizing; and (6) tempering. The invention adjusts the sequence of the heat treatment process, namely the step of high-temperature diffusion is placed after the step of cold cutting, but after the adjustment, a large amount of excess materials and protective layers are removed through the cold cutting ring, the thickness of a workpiece is reduced, and then the link of high-temperature diffusion can be completed in 4-7 hours, so that the time is shortened for a large part, the diffusion is more sufficient, and the quality of a matrix structure is better; after the time of the high-temperature diffusion link is shortened, the phenomenon that the glass slag becomes solution flow on the trolley surface of the heat treatment furnace after being subjected to high temperature is effectively controlled, the equipment faults are reduced, the service life of the equipment is prolonged, and the operation cost is reduced.
The Chinese invention patent CN 108265217 also discloses a method for preparing a composite material roll collar of a Ti (C, N) -304 stainless steel cermet hot rolling mill, which comprises the steps of uniformly mixing Ti (C, N), Fe, Ni, Cr, Mn, Si and C powder, wet-grinding under the protection of argon, drying and sieving to obtain powder; putting the powder into a metal die for compression molding to form a roll collar shape; firstly, placing a blank body in the shape of a roll collar into a solid phase for sintering, and then machining to obtain the required size of the roll collar; and sintering the prefabricated body of the hot roll ring after mechanical processing at high temperature to obtain the Ti (C, N) -304 stainless steel cermet hot roll ring. The process is easy to operate, the prepared metal ceramic is simple in components, does not contain W, Co strategic scarce resources, is low in Ni content and is low in cost. The composite roll can be prepared by matching with graphite cast iron, has good wear resistance, long service life and light weight, and is suitable for industrial application. The Chinese invention patent CN 107931333 also discloses a hard alloy roll collar, which comprises a roll collar main body (1), a first roll collar ring body (2), a second roll collar ring body (3), a groove (4) and a shaft hole (5), and is characterized in that: the roll collar is characterized in that a first roll collar ring body (2) and a second roll collar ring body (3) are connected to the roll collar main body (1), a groove (4) is formed in the first roll collar ring body (2), a shaft hole (5) is formed in the center of the roll collar main body (1), and the roll collar main body (1), the first roll collar ring body (2) and the second roll collar ring body (3) are made of hard alloy materials in an integrated mode. The roll collar main body, the first roll collar ring body and the second roll collar ring body are integrally made of hard alloy materials, so that the quality of the roll collar can be effectively improved, the strength of the roll collar is enhanced, and the service life of the roll collar is prolonged. The Chinese invention patent CN 107900107 also discloses a non-stick steel roll collar, which comprises a roll collar main body (1), a first roll collar shaft body (2), a second roll collar shaft body (3), a groove (4) and a shaft hole (5), and is characterized in that: the roller ring is characterized in that the left side and the right side of the roller ring main body (1) are respectively connected with a first roller ring shaft body (2) and a second roller ring shaft body (3), a groove (4) is formed in the roller ring main body (1), a shaft hole (5) is formed in the center of the roller ring main body (1), and the roller ring main body (1), the first roller ring shaft body (2) and the second roller ring shaft body (3) are integrally manufactured by adopting a spinning process. The roller ring main body, the first roller ring shaft body and the second roller ring shaft body are integrally manufactured by adopting a spinning process, so that the quality of the roller ring can be effectively improved, and the roller ring has the advantage of no steel adhesion. 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 CN 106345815 also discloses a hard alloy composite roll collar, a composite roll collar group and a method for manufacturing the composite roll collar, wherein the hard alloy composite roll collar comprises: two steel inner sleeves and a hard alloy outer sleeve; the steel inner sleeve comprises a base part and a bulge part which are integrally formed, the base part and the bulge part are respectively in a hollow cylindrical shape, the base part and the bulge part are coaxial and have the same inner diameter, and the outer diameter of the base part is larger than that of the bulge part; the hard alloy outer sleeve is in a hollow cylindrical shape, the inner diameter of the hard alloy outer sleeve is larger than the outer diameter of the protruding parts, the axial width of the hard alloy outer sleeve is smaller than the sum of the axial widths of the two protruding parts in the two steel inner sleeves, and the outer diameter of the hard alloy outer sleeve is equal to the outer diameter of the base part; a joint layer is filled in a gap between the hard alloy outer sleeve and the two steel inner sleeves, and the end faces of the steel inner sleeves are provided with filling holes communicated with the gap; the steel inner sleeve and the hard alloy outer sleeve are designed, so that the bonding strength between the steel inner sleeve and the hard alloy outer sleeve is obviously enhanced.
The Chinese invention patent CN 107841683 also discloses a vertical roll ring for the head of a high-speed heavy rail and a preparation process thereof, wherein the process comprises the following steps: step one, determining chemical components; c: 2.55-2.95%; si: 0.50-1.0%; mn: 0.35-0.65%; cr: 3.5 to 3.85 percent; ni: not less than 0.35 percent; mo: 1.6 to 1.95 percent; v: 9.0 to 9.5 percent; co: not less than 0.3 percent; p is less than or equal to 0.030 percent; s is less than or equal to 0.025 percent; al: 0 is less than or equal to 0.03 percent; re is more than or equal to 0.15 percent; the balance of Fe and inevitable impurities; step two, centrifugal casting: smelting in an electric arc furnace to ensure that the chemical components of the molten steel meet the requirements; deoxidizing and resisting oxidation by using an aluminum block and glass slag before tapping; step three, heat treatment: and (3) opening the blank at the temperature of 450-. The vertical roll ring is made of high-vanadium high-speed steel, so that the wear resistance and the thermal crack resistance of the roll are improved. The Chinese invention patent CN 107574362 also discloses a wear-resistant alloy composite roll collar and a manufacturing method and a manufacturing device thereof, and the wear-resistant alloy of the invention consists of the following elements in percentage by mass: c: 2.2-3.5%, V: 5-15%, Cr: 3-6%, Mo: 1.5-3.5%, Ni: 0.5-0.8%, Si: 0.5-1.0%, Mn: 0.5-1.0%, B: 0.005-0.01%, rare earth elements: 0.1-0.3%, and the balance of iron and inevitable impurities. The wear-resistant alloy has slightly high contents of chromium and molybdenum elements, and has better functions of heat resistance, oxidation resistance and thermal fatigue resistance. The composite roll collar obtained by using the wear-resistant alloy of the invention as a wear-resistant alloy layer has good wear resistance and high cost performance, the cost is about 2 times of that of high-chromium cast iron, and the wear resistance is 2-5 times of that of the high-chromium cast iron. The Chinese invention patent CN 106282747 also discloses an integrally cast universal horizontal high-chromium cast iron roll collar, which consists of two mixed components, wherein one of the two mixed components comprises 1.70-2.10 mass percent of component C; 0.40-1.00% of Si0; 0.70-1.20 parts of Mn0.20; ni0.20-1.30; cr10.00-20.00; mo0.50-1.50; s is less than or equal to 0.03; p is less than or equal to 0.03, and the balance of Fe and inevitable impurities; the other mixed component comprises, by mass, 0.70-1.20% of C, 1.30-1.90% of Si, 0.50-0.80% of Mn, less than or equal to 0.50% of Ni, less than or equal to 0.50% of Cr, less than or equal to 0.15% of Mo, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance of Fe and inevitable impurities. Meanwhile, the invention also discloses a preparation method of the high-chromium cast iron roll collar. The high-chromium cast iron roll collar produced by the method has high hardness, good wear resistance and long service life. The Chinese invention patent CN 106676409 also discloses a high chromium steel roll collar and a manufacturing method thereof, the high chromium steel roll collar comprises an outer layer and a core part, the ratio of the outer layer to the core part is 1:2, and the alloy components of the outer layer and the weight percentage of each alloy component are as follows: c: 0.80-1.40%, Si: 0.40 to 1.00%, Mn: 0.60-1.20%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 8.00% -14.0%, Mo: 1.00-3.00%, Ni + V: 0.50-1.50%, and the balance of Fe and inevitable impurities; the invention aims to solve the technical problems of insufficient wear resistance, poor surface quality of rolled materials, poor interface bonding between an outer layer and a core part, low bonding strength and the like of the composite casting roll collar in the using process, and provides an economical and feasible manufacturing method for the production of the roll collar of large and small vertical rolls of a hot strip mill. The Chinese invention patent CN 106636876 also discloses a preparation method of the novel high-carbon graphite steel roll collar. The roll collar of the invention adopts a centrifugal three-layer composite casting process, and by adding special carbide elements such as V, Nb, Mo and the like, tapping is carried out when the liquid phase temperature reaches + 120-plus-150 ℃, 0.30-0.60% of BaCa0.60% of spheroidization treatment is added, 0.50-0.60% of CaSi inoculant is added for inoculation after spheroidization, then the casting is carried out for 3-8 minutes, and a finished product with the hardness of the surface of the roll collar and the metallographic structure of a matrix meeting the requirements is obtained through special heat treatment after cold unpacking. Compared with the common roll collar, the special carbide elements are added into the product, and the special fine granular carbide and the spherical graphite with oxidation resistance and lubrication function are cultivated through BaCa spheroidization and CaSi inoculant inoculation, so that the comprehensive performance of the roll collar is improved, and the service life of the roll collar is prolonged. The Chinese invention patent CN106884124 also discloses a centrifugally cast wear-resistant roll collar and a preparation method thereof, wherein the components and weight percentage of a working layer are C1.50-2.30, Si 0.20-1.00, Mn 0.20-1.00, Ni 0.20-1.20, Cr 2.00-5.00, Mo 0.20-1.00, P is less than or equal to 0.03%, S is less than or equal to 0.03%, V0.20-0.6%, and the balance of Fe and inevitable impurities; the core comprises 1.00-1.80 wt% of C, 1.20-1.80 wt% of Si, 0.60-1.00 wt% of Mn, less than or equal to 0.03 wt% of P, less than or equal to 0.03 wt% of S, and the balance of Fe and inevitable impurities. The process comprises the following steps: a) smelting: respectively smelting inner layer molten iron and outer layer molten iron, adding a composite material into the outer layer molten iron before the molten iron is discharged from the electric furnace, stirring, and carrying out spheroidization modification treatment on the inner layer molten iron before the molten iron is discharged from the electric furnace; b) centrifugal casting: pouring the outer layer molten iron into the casting mold; after the outer layer molten iron is solidified, pouring the inner layer molten iron into the casting mold, and solidifying in a centrifugal state to obtain a roll collar blank; c) heat treatment; d) and (5) final treatment. The wear resistance of the roll collar obtained by the preparation method is improved by about 1.5 times.
However, the thick-wall roll collar prepared by the materials and the process method generally has the defects that the interior of the roll collar is easy to loosen, the roll collar is easy to crack in the using process and the like.
Disclosure of Invention
The invention aims to improve the compactness of the roll collar, prevent the internal loosening defect of the roll collar and ensure that the thick-wall roll collar is not brittle and cracked in the use process by changing the forming method of the roll collar, and on the basis, the hardness and the wear resistance of the roll collar are improved and the use safety and the wear resistance of the thick roll collar are ensured to be excellent.
The invention can be realized by the following process steps:
① smelting high-speed molten steel in a medium-frequency induction furnace, controlling the chemical composition and mass fraction of the high-speed molten steel at 1.63-1.72% C, 0.27-0.35% Si, 0.25-0.34% Mn,<0.030％S,<0.025% of P, 12.52-12.79% of Cr, 1.51-1.69% of Mo, 6.71-6.94% of W, 2.37-2.49% of V, 5.32-5.48% of Co, 1.03-1.24% of Nb, and the balance of Fe and other inevitable impurities; then heating the molten steel to 1647-1661 ℃, preserving the temperature for 5-6 minutes, adding multi-element alloy additive particles accounting for 0.8-0.9% of the mass fraction of the molten steel in the furnace, wherein the size of the multi-element alloy additive particles is 8-10mm, the chemical composition and the mass fraction of the multi-element alloy additive particles are 25-28% of Si, 20-21% of Ni, 12-13% of Ba, 22-24% of Al and 17-18% of Ca,<1.0% C; keeping the temperature for 4-5 minutes, discharging the molten steel to a ladle, and thenFeeding core-spun yarn into the ladle by a yarn feeder, wherein the chemical composition and the mass fraction of the core-spun yarn are 6.04-6.39% of Ce, 2.11-2.29% of L a, 33.20-33.57% of Si, 1.39-1.58% of Mg, 8.52-8.70% of K, 2.44-2.61% of N, 8.35-8.62% of V and 7.40-7.83% of Zn,<0.02％S,<0.03% of P, the balance being Fe and other unavoidable impurities, the diameter of the cored wire
The adding amount of the core-spun yarn accounts for 1.2-1.4% of the mass fraction of molten steel in the ladle;
② molten steel is subjected to slag removal and standing, the molten steel is poured into a casting mold rotating at a high speed on a horizontal centrifuge for three times, the casting mold rotating speed is 1200-1250 revolutions per minute, the casting mold material is 35CrMoV forged steel, the wall thickness is 150mm, the casting mold length is 1.5-4.5m, the casting mold preheating temperature is 190-210 ℃, paint is sprayed at the temperature, the casting mold temperature is not lower than 160 ℃, the paint thickness is 3.3-3.5mm, the first molten steel pouring amount accounts for 45-50% of the total mass fraction of the molten steel to be poured into the casting mold, the first molten steel pouring temperature is 1562-1583 ℃, after the first molten steel pouring is finished, the casting mold is cooled immediately, the inner surface temperature of the roller ring is measured by a non-contact temperature measuring instrument, when the temperature is 1247-1288 ℃, the second molten steel is poured immediately, the second molten steel pouring amount accounts for 32-35% of the total mass fraction of the molten steel to be poured into the casting mold, the roller ring is poured into a secondary molten steel pouring temperature furnace, the roller ring is cooled, the roller ring, the temperature is lowered from 1537-10.8 ℃, the secondary molten steel pouring temperature is lowered from 10.3-10% of the roller ring, the roller casting mold is cooled, the roller ring, the roller casting temperature is cooled, the roller ring is cooled, the roller casting temperature is cooled for the roller ring, the roller ring is cooled for the roller ring for the third molten steel pouring for the roller ring for the third molten steel pouring, the roller ring for the roller casting, the roller ring for the roller ring;
③ heating the roller ring after rough machining to 1120-1135 ℃ along with the furnace, preserving heat for 90-120 minutes, taking out the roller ring and air-cooling to 450-540 ℃, then heating to 530-545 ℃ again in the furnace, preserving heat for 12-15 hours, cooling the roller ring to a temperature lower than 120 ℃, taking out the roller ring and air-cooling to room temperature, and finally finishing to a specified size and precision to obtain the thick-wall high-speed steel wear-resistant roller ring.
The thick-wall high-speed steel wear-resistant roll collar and the preparation method thereof adopt a medium-frequency induction furnace to smelt molten steel of high-speed steel, and have the advantages of simple and convenient process and simple operation. And the chemical composition and the mass fraction of the high-speed steel molten steel are controlled to be 1.63 to 1.72 percent of C,0.27 to 0.35 percent of Si and 0.25 to 0.34 percent of Mn,<0.030％S,<0.025% of P, 12.52-12.79% of Cr, 1.51-1.69% of Mo, 6.71-6.94% of W, 2.37-2.49% of V, 5.32-5.48% of Co, 1.03-1.24% of Nb, and the balance of Fe and other inevitable impurities. Wherein, 1.63 to 1.72 percent of C is added to generate high-hardness alloy carbide with 1.51 to 1.69 percent of Mo,1.03 to 1.24 percent of Nb,6.71 to 6.94 percent of W and 2.37 to 2.49 percent of V, which is beneficial to improving the wear resistance of the roll collar. In addition, 12.52-12.79% of Cr is added, part of the chromium enters the matrix, the high-temperature oxidation resistance of the roll collar is favorably improved, chromium elements which are dissolved in the matrix are easy to precipitate fine and dispersedly distributed Cr during high-temperature tempering23C6Carbide makes the matrix dispersion strengthened, which is beneficial to improving the wear resistance of the roll collar. Adding 5.32-5.48% Co, which is a non-carbide forming element and is mainly dissolved in the matrix to improve the high-temperature hardness of the matrix, thereby improving the high-temperature wear resistance of the high-speed steel, and controlling the content of the cobalt to be 5.32-5.48% by increasing the brittleness of the roll collar due to excessive addition of the cobalt. 0.27-0.35% Si, 0.25-0.34% Mn are added for deoxidation only. Sulfur and phosphorus cause harmful elements to damage the obdurability of the high-speed steel roll collar, and the content of S is controlled to be<0.030%, and the content of P is controlled to<0.025％。
Then heating the molten steel to 1647-1661 ℃, preserving the temperature for 5-6 minutes, adding multi-element alloy additive particles accounting for 0.8-0.9% of the mass fraction of the molten steel in the furnace, wherein the size of the multi-element alloy additive particles is 8-10mm, and the chemical composition and the mass fraction of the multi-element alloy additive particles are 25-28% of Si, 20-21% of Ni, 12-13% of Ba, 22-24% of Al, 17-18% of Ca and less than 1.0% of C. Adding multi-element alloy additive particles, wherein 25-28% of Si, 12-13% of Ba, 22-24% of Al and 17-18% of Ca are mainly utilized for deoxidation, improving the form and distribution of inclusions, and being beneficial to improving the toughness of the high-speed steel roll ring. The high-speed steel matrix is reinforced by using 20-21% of Ni, and the 20-21% of Ni exists in the multi-element alloy additive particles, so that the density of the multi-element alloy additive particles can be improved, and the multi-element alloy additive particles are prevented from floating to the surface of molten steel after the molten steel enters a steel ladle, and the multi-element alloy additive particles lose the effect.
After the multi-element alloy additive particles are added into the molten steel, the molten steel is kept for 4 to 5 minutes, then the molten steel is discharged to a ladle, and a core-spun yarn is fed into the ladle by a wire feeder, wherein the chemical composition and the mass fraction of the core-spun yarn are 6.04 to 6.39 percent of Ce,2.11 to 2.29 percent of L a,33.20 to 33.57 percent of Si,1.39 to 1.58 percent of Mg,8.52 to 8.70 percent of K,2.44 to 2.61 percent of N,8.35 to 8.62 percent of V,7.40 to 7.83 percent of Zn,<0.02％S,<0.03% of P, the balance being Fe and other unavoidable impurities, the diameter of the cored wire
The addition amount of the cored wire accounts for 1.2-1.4% of the mass fraction of molten steel in the ladle, and the cored wire is added mainly for improving the form and distribution of carbides in high-speed steel, obviously refining crystal grains, promoting the great improvement of the toughness of a high-speed steel roll collar and preventing the roll collar from cracking and peeling in use. After slagging off and standing the molten steel, pouring the molten steel into a casting mold rotating at a high speed on a horizontal centrifuge for three times. The rotation speed of the casting mould is selected to be 1200-1250 rpm, which is beneficial to promoting the densification of the roller ring. The casting mold is made of 35CrMoV forged steel, which is beneficial to improving the toughness of the casting mold, so that the casting mold can realize water spray cooling after high-speed molten steel is poured. The thickness of the casting mold is 120-150mm, and the length of the casting mold is 1.5-4.5 m; the preheating temperature of the casting mold is 190 ℃ and 210 ℃, and the coating is sprayed at the temperature, and the casting mold temperature is not lower than 160 ℃ during casting; the thickness of the coating is 3.3-3.5 mm.
The pouring amount of the first molten steel accounts for 45-50% of the total mass fraction of the molten steel entering the casting mold, and the pouring temperature of the first molten steel is 1562-; after the first molten steel pouring is finished, the casting mold is immediately sprayed with water to cool the casting mold, so that the solidification of the molten steel can be accelerated, the densification of the thick-wall roll collar is facilitated, and the beneficial effects of refining grains and reducing element segregation are achieved. Measuring the inner surface temperature of the roll collar by using a non-contact type temperature measuring instrument after the first molten steel is completely poured, and immediately pouring second molten steel when the temperature is 1247-; the pouring temperature of the second molten steel is 1537-1558 ℃, and cast iron particles with the particle size of 1.2-2.0mm are added along with the molten steel flow in the pouring process of the second molten steel, wherein the adding amount of the cast iron particles accounts for 2.5 percent of the mass fraction of the molten steel entering the casting mold for the second time. Cast iron particles with the particle size of 1.2-2.0mm are added along with the molten steel flow, mainly for accelerating the solidification and cooling of the molten steel poured for the second time and promoting the densification of the roll collar. After the second molten steel pouring is finished, stopping water cooling of the casting mould to prevent the roll collar from cracking; pouring the third molten steel immediately after the second molten steel pouring is finished for 3.0-3.5 minutes, wherein the pouring amount of the third molten steel accounts for 18-20% of the total mass fraction of the molten steel entering the casting mold, and the pouring temperature of the third molten steel is 1506-1533 ℃. The sum of the total mass fractions of the molten steel poured for three times is 100 percent.
After the molten steel poured into the casting mold is completely solidified, taking out the roller ring blank, wherein the wall thickness of the roller ring blank is 120-280 mm, heating the roller ring blank to 980-. The roller ring after rough machining is heated to 1120-1135 ℃ along with the furnace, the temperature is kept for 90-120 minutes, the roller ring is taken out of the furnace and air-cooled to 450-540 ℃, high-temperature austenitization is mainly utilized to eliminate pearlite with low hardness in an annealing structure, and high-hardness martensite and bainite structures are obtained after quenching. And the roll collar is put into the furnace again to be heated to 530-545 ℃ after quenching, is kept warm for 12-15 hours, is taken out of the furnace to be cooled to room temperature after being cooled to the temperature lower than 120 ℃, and is mainly used for stabilizing the structure, eliminating the internal stress and ensuring the safe and stable use of the roll collar. And finally, finish machining the roll collar to a specified size and precision to obtain the thick-wall high-speed steel wear-resistant roll collar.
Compared with the prior art, the invention has the following advantages:
1) the wall thickness of the roll collar is large and reaches 120mm-280mm, the structure of the roll collar is compact, and the roll collar has no casting defects such as shrinkage cavities, looseness and the like;
2) the roll collar has excellent comprehensive mechanical properties, wherein the hardness is more than 85HSD, the bending strength is more than 2600MPa, and the impact toughness is more than 20J/cm2；
3) The roll collar has excellent use performance, is used for rolling low-alloy high-strength steel bars on a large bar mill, is safe and reliable to use, has the service life prolonged by more than 3 times than that of a high-chromium cast iron roll collar, reaches the level of a hard alloy roll collar, has the manufacturing cost reduced by more than 60 percent than that of the hard alloy roll collar, and has good economic and social benefits when being popularized and applied.
Drawings
FIG. 1 is a photograph of a macroscopic structure of a roll collar of the present invention, 100 ×.
FIG. 2 is a photograph of a high magnification microstructure of a roll collar of the present invention, 500 ×.
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:
a thick-wall high-speed steel wear-resistant roll collar and a preparation method thereof adopt an electric furnace to smelt molten steel, and the preparation method comprises the following specific preparation process steps:
① smelting high speed molten steel in 1500 kg MF induction furnace with the chemical composition and mass fraction of 1.63% C, 0.35% Si, 0.25% Mn, 0.027% S, 0.021% P, 12.79% Cr, 1.51% Mo, 6.94% W, 2.37% V, 5.48% Co, 1.03% Nb, and the balance Fe and other inevitable impurities, heating the molten steel to 1661 deg.C, holding for 5 min, adding multi-element alloy additive particles accounting for 0.9% of the molten steel mass fraction in the furnace, the size of the multi-element alloy additive particles being 8-10mm, the chemical composition and mass fraction of the multi-element alloy additive particles being 27.2% Si, 20% Ni, 13% Ba, 22% Al, 17% Ca, and 0.80% C, holding for 5 min, feeding the molten steel out of the furnace, and covering with steel wire by wire-feeding machineThe core wire comprises 6.39% of Ce, 2.11% of L a, 33.57% of Si, 1.39% of Mg, 8.70% of K, 2.44% of N, 8.62% of V, 7.83% of Zn, 0.014% of S, 0.020% of P, and the balance of Fe and other inevitable impurities, and has a diameter of the core wire
The adding amount of the core-spun yarn accounts for 1.2 percent of the mass fraction of molten steel in the steel ladle;
② pouring molten steel into a casting mould rotating at high speed on a horizontal centrifuge for three times after slagging off and standing, wherein the casting mould is made of 35CrMoV forged steel, the wall thickness is 120mm, the length of the casting mould is 3m, the preheating temperature of the casting mould is 193 ℃, coating is sprayed at the temperature (the coating is common in casting production, mainly a protective metal mould is easy to demould, and is generally common zircon powder coating), the casting mould temperature is not lower than 160 ℃ during casting, the coating thickness is 3.3mm, the pouring amount of the first molten steel accounts for 50% of the total mass fraction of the molten steel to be poured into the casting mould, the pouring temperature of the first molten steel is 1562 ℃, after the first molten steel pouring is finished, the casting mould is immediately cooled by spraying water, the inner surface temperature of a roll collar is measured by a non-contact temperature measuring instrument, when the temperature is 1247 ℃, the second molten steel is poured into the second molten steel immediately, the pouring amount of the second molten steel accounts for 32% of the total mass fraction of the molten steel to be poured into the molten steel after the roll collar is finished, the second molten steel pouring is poured into a roll collar, the casting mould, the third molten steel is poured into a heat preservation furnace, the roll casting furnace, the casting is finished, the casting, the total pouring temperature of the casting is 1558 ℃, the casting is finished, the total casting temperature of the casting is finished, the casting furnace is finished, the casting time of the casting furnace is finished, the casting time of the casting is finished, the casting time of the casting, the casting is finished, the casting time of the casting;
③ the roller ring after rough machining is heated to 1120 ℃ along with the furnace, the temperature is preserved for 120 minutes, the roller ring is taken out of the furnace and air-cooled to 523-540 ℃, then the roller ring is heated to 545 ℃ again, the roller ring is taken out of the furnace and air-cooled to room temperature after heat preservation for 12 hours and the temperature of the furnace is cooled to be lower than 120 ℃, finally the roller ring is finish-machined to the specified size and precision, and the thick-wall high-speed steel wear-resistant roller ring can be obtained, the mechanical properties of the roller ring are shown in Table 1, and the microstructure.
Example 2:
a thick-wall high-speed steel wear-resistant roll collar and a preparation method thereof adopt an electric furnace to smelt molten steel, and the preparation method comprises the following specific preparation process steps:
① molten high-speed steel is smelted in 5000 kg medium-frequency induction furnace, the chemical composition and mass fraction of the molten high-speed steel are controlled to 1.72% C, 0.27% Si, 0.33% Mn, 0.024% S, 0.020% P, 12.52% Cr, 1.69% Mo, 6.71% W, 2.49% V, 5.32% Co, 1.24% Nb, and the balance Fe and other unavoidable impurities, the molten steel is heated to 1647 deg.C, after 5 minutes of heat preservation, multi-element alloy additive particles accounting for 0.8% of the molten steel mass fraction in the furnace are added, the size of the multi-element alloy additive particles is 8-10mm, the chemical composition and mass fraction of the multi-element alloy additive particles are 25% Si, 21% Ni, 12% Ba, 23.43% Al, 18% Ca, 0.57% C, after 4 minutes of heat preservation, the molten steel is fed into the furnace, and then wire-clad wire is fed into a wire by wire-drawing machine, the chemical composition and mass fraction of the wire is 6.04% Ce, 2.52% Mg, 2.52% Si, 2.52% S, 2.8% Fe, 2% P, 2.8% Fe, 2% of inevitable impurities, 2.8
The adding amount of the core-spun yarn accounts for 1.4 percent of the mass fraction of molten steel in the steel ladle;
② molten steel is subjected to slag removal and standing, the molten steel is poured into a casting mold rotating at a high speed on a horizontal centrifuge for three times, the rotation speed of the casting mold is 1250 revolutions per minute, the casting mold material is 35CrMoV forged steel, the wall thickness is 150mm, the length of the casting mold is 3.5m, the preheating temperature of the casting mold is 210 ℃, paint is sprayed at the temperature (the paint is common in casting production and mainly protects a metal mold and is easy to demould), the casting mold temperature is not lower than 160 ℃ during casting, the paint thickness is 3.5mm, the first molten steel pouring amount accounts for 45% of the total mass fraction of the molten steel to be poured into the casting mold, the first molten steel pouring temperature is 1583 ℃, the first molten steel pouring is immediately sprayed with water to cool the casting mold, the inner surface temperature of a roll collar is measured by a non-contact temperature measuring instrument after the first molten steel pouring, the second molten steel is immediately poured into the casting mold when the temperature is 1288 ℃, the second molten steel pouring amount accounts for 35% of the total mass fraction of the molten steel to be poured into the casting mold, the second molten steel pouring into the casting mold after the second molten steel pouring temperature is 1537 ℃, the second molten steel pouring temperature of the roll collar is measured by a non-contact temperature measuring instrument, the wall thickness of the roll collar, the roll casting mold, the roll collar is immediately, the roll casting mold, the roll collar, the roll casting, the roll collar is immediately, the roll casting, the roll collar is added into the roll collar, the roll casting, the roll collar is cooled casting, the roll collar is cooled;
③ heating the roller ring after rough machining to 1135 ℃ along with the furnace, preserving heat for 90 minutes, taking out of the furnace, air cooling to 450-.
Example 3:
a thick-wall high-speed steel wear-resistant roll collar and a preparation method thereof adopt an electric furnace to smelt molten steel, and the preparation method comprises the following specific preparation process steps:
① melting molten high-speed steel in a 3000 kg medium-frequency induction furnace, and controlling the chemical composition and mass fraction of the molten high-speed steel to 1.68% of C, 0.29% of Si, 0.31% of Mn, 0.025% of S, 0.024% of P, 12.70% of Cr, 1.57% of Mo, 6.79% of W, 2.44% of V, 5.38% of Co, 1.09% of Nb, and the balance Fe and other unavoidable impuritiesHeating the molten steel to 1656 ℃, keeping the temperature for 6 minutes, adding multi-element alloy additive particles accounting for 0.85 percent of the mass fraction of the molten steel in the furnace, wherein the size of the multi-element alloy additive particles is 8-10mm, the chemical composition and the mass fraction of the multi-element alloy additive particles are 25.5 percent of Si,20.38 percent of Ni,12.04 percent of Ba,23.95 percent of Al,17.52 percent of Ca and 0.61 percent of C, keeping the temperature for 4.5 minutes, discharging the molten steel to a ladle, and then feeding a core-spun yarn into the ladle by using a yarn feeder, wherein the chemical composition and the mass fraction of the core-spun yarn are 6.25 percent of Ce,2.18 percent of L a,33.41 percent of Si,1.43 percent of Mg,8.61 percent of K,2.47 percent of N,8.48 percent of V,7.65 percent of Zn,0.007 percent of S,0.023 percent of P, and the balance of Fe and other inevitable impurities, and the diameter of the
The adding amount of the core-spun yarn accounts for 1.3 percent of the mass fraction of molten steel in the steel ladle;
② pouring molten steel into a casting mould rotating at high speed on a horizontal centrifuge for three times after slagging off and standing, wherein the casting mould is made of 35CrMoV forged steel, the wall thickness is 140mm, the length of the casting mould is 1.8m, the preheating temperature of the casting mould is 195 ℃, coating is sprayed at the temperature (the coating is common in casting production and mainly protects a metal mould, and is easy to demould, and is generally common zircon powder coating), the casting mould temperature is not lower than 160 ℃ during casting, the coating thickness is 3.4mm, the first molten steel pouring amount accounts for 48% of the total mass fraction of the molten steel to be poured into the casting mould, the first molten steel pouring temperature is 1575 ℃, the casting mould is immediately sprayed and cooled after the first molten steel pouring, the inner surface temperature of the roll collar is measured by a non-contact temperature measuring instrument, when the temperature is 1263 ℃, the second molten steel is poured immediately, the second molten steel pouring amount accounts for 33% of the total mass fraction of the molten steel to be poured into the casting mould, the second molten steel pouring temperature is 1 ℃ when the second molten steel pouring temperature is 1263 ℃, the second molten steel pouring temperature of the roll ring, the casting mould is kept at 1555.3 ℃, the third molten steel pouring temperature, the casting mould, the third molten steel pouring temperature is kept, the molten steel pouring temperature, the molten steel pouring is kept at 1555.3 ℃ after the roll ring, the roll casting blank, the third molten steel pouring temperature, the roll casting mould, the roll ring is kept, the roll casting blank, the roll casting is kept, the roll casting blank, the roll casting furnace is kept, the total casting furnace is kept, the roll casting, the total casting temperature is kept, the;
③ the roll collar after rough machining is heated to 1130 ℃ along with the furnace, the temperature is preserved for 100 minutes, the roll collar is taken out of the furnace and air-cooled to 485 and 500 ℃, then the roll collar is put into the furnace again and heated to 540 ℃, the temperature is preserved for 14 hours, the furnace is cooled to a temperature lower than 120 ℃, the roll collar is taken out of the furnace and air-cooled to room temperature, and finally the roll collar is finished to specified size and precision, thus obtaining the thick-wall high-speed steel wear-resistant roll collar, wherein the mechanical properties are shown in.
TABLE 1 mechanical properties of thick-wall high-speed steel wear-resistant roll collar
| Mechanical properties | hardness/HSD | Flexural strength/MPa | Impact toughness, J/cm2 |
| Example 1 | 86.6 | 2745 | 20.7 |
| Example 2 | 87.3 | 2680 | 21.4 |
| Example 3 | 86.2 | 2720 | 20.9 |
The roll collar has large wall thickness of 120-280 mm, compact structure, and no casting defects such as shrinkage cavity, looseness and the like. The roll collar has excellent comprehensive mechanical properties, wherein the hardness is more than 85HSD, the bending strength is more than 2600MPa, and the impact toughness is more than 20J/cm2The high-strength low-alloy steel bar rolling mill is used for rolling low-alloy high-strength steel bars on a large bar rolling mill, is safe and reliable to use, has the service life prolonged by more than 3 times than that of a high-chromium cast iron roll collar, reaches the level of a hard alloy roll collar, has the manufacturing cost reduced by more than 60 percent compared with the hard alloy roll collar, and has good economic and social benefits when being popularized and applied.
Claims (4)
1. The preparation method of the thick-wall high-speed steel wear-resistant roll collar is characterized by comprising the following steps of:
① smelting high-speed molten steel in a medium-frequency induction furnace, controlling the chemical composition and mass fraction of the high-speed molten steel at 1.63-1.72% C, 0.27-0.35% Si, 0.25-0.34% Mn,<0.030％S,<0.025% of P, 12.52-12.79% of Cr, 1.51-1.69% of Mo, 6.71-6.94% of W, 2.37-2.49% of V, 5.32-5.48% of Co, 1.03-1.24% of Nb, and the balance of Fe and other inevitable impurities; then heating the molten steel to 1647-1661 ℃, preserving the temperature for 5-6 minutes, adding multi-element alloy additive particles accounting for 0.8-0.9% of the mass fraction of the molten steel in the furnace, wherein the size of the multi-element alloy additive particles is 8-10mm, the chemical composition and the mass fraction of the multi-element alloy additive particles are 25-28% of Si, 20-21% of Ni, 12-13% of Ba, 22-24% of Al and 17-18% of Ca,<1.0 percent of C, keeping the temperature for 4-5 minutes, discharging the molten steel to a ladle, then feeding a core-spun yarn into the ladle by a wire feeder, wherein the chemical composition and the mass fraction of the core-spun yarn are 6.04-6.39 percent of Ce,2.11-2.29 percent of L a,33.20-33.57 percent of Si,1.39-1.58 percent of Mg,8.52-8.70 percent of K,2.44-2.61 percent of N,8.35-8.62 percent of V,7.40-7.83 percent of Zn,<0.02％S,<0.03% P, the balance Fe and other unavoidable impuritiesFree of impurities, core diameter
The adding amount of the core-spun yarn accounts for 1.2-1.4% of the mass fraction of molten steel in the ladle;
② molten steel is subjected to slag removal and standing, the molten steel is poured into a casting mold rotating at a high speed on a horizontal centrifuge for three times, the casting mold rotating speed is 1200-1250 revolutions per minute, the preheating temperature of the casting mold is 190-210 ℃, paint is sprayed at the temperature, the casting mold temperature is not lower than 160 ℃, the paint thickness is 3.3-3.5mm, the pouring amount of the molten steel for the first time accounts for 45-50% of the total mass fraction of the molten steel to be poured into the casting mold, the pouring temperature of the molten steel for the first time is 1583 ℃, water is sprayed immediately after the pouring of the molten steel for the first time is completed, the casting mold is cooled, the inner surface temperature of the roll ring is measured by a non-contact type thermodetector, when the temperature is 1287-8 ℃, the molten steel for the second time is poured into the roll ring, the pouring temperature of the molten steel for the second time accounts for 32-35% of the total mass fraction of the molten steel to be poured into the casting mold, the pouring temperature of the molten steel for the second time is 1537-35%, the pouring temperature of the molten steel for the total mass fraction of the molten steel to be poured into the roll ring after the casting mold is completed, the roll ring, the pouring temperature is 1533-3 hours after the molten steel for the third time, the roll ring is cooled, the roll ring after the roll ring is cooled, the roll ring is cooled for the third time, the roll ring after the roll ring is cooled, the roll ring after the roll ring is cooled for three times, the roll ring after the roll ring is cooled, the roll ring is cooled;
③ heating the roller ring after rough machining to 1120-1135 ℃ along with the furnace, preserving heat for 90-120 minutes, taking out the roller ring and air-cooling to 450-540 ℃, then heating to 530-545 ℃ again in the furnace, preserving heat for 12-15 hours, cooling the roller ring to a temperature lower than 120 ℃, taking out the roller ring and air-cooling to room temperature, and finally finishing to a specified size and precision to obtain the thick-wall high-speed steel wear-resistant roller ring.
2. The method for preparing the thick-walled high-speed steel wear-resistant roller ring as claimed in claim 1, wherein the step ② is to make the mold material of 35CrMoV forged steel, the wall thickness of 120mm and the length of the mold of 1.5-4.5 m.
3. A method for manufacturing a thick-walled high-speed steel wear-resistant roll collar as claimed in claim 1, wherein the coating material is zircon powder coating material.
4. A thick-walled high speed steel wear resistant roller ring produced according to the method of any one of claims 1 to 3.
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Denomination of invention: Thick walled high speed steel wear-resistant roll ring and its preparation method Effective date of registration: 20221124 Granted publication date: 20200710 Pledgee: Tongling Wanjiang Rural Commercial Bank Co.,Ltd. Jinghu Sub branch Pledgor: ANHUI HUANBOWAN HIGH SPEED STEEL MILL ROLL Co.,Ltd. Registration number: Y2022980023428 |