CN112247151A - High-carbon high-vanadium powder high-speed steel composite roll collar and manufacturing method thereof - Google Patents
High-carbon high-vanadium powder high-speed steel composite roll collar and manufacturing method thereof Download PDFInfo
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- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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Abstract
The invention discloses a high-carbon high-vanadium powder high-speed steel composite roll collar, which comprises: the steel pipe comprises an inner layer steel pipe (1) and an outer layer powder high-speed steel (2), wherein the inner layer steel pipe (1) is a prefabricated cylindrical inner steel pipe, and the outer layer powder high-speed steel (2) is a cylindrical high-speed steel pipe which is coated on the periphery of the inner layer steel pipe (1) through a hot isostatic pressing method; the ratio of the thickness of the inner layer steel pipe (1) to the thickness of the outer layer powder high-speed steel (2) is 1: (0.6-1.5). The high-carbon high-vanadium powder high-speed steel composite roll collar has the advantages of high wear resistance, good red hardness and higher compressive strength of powder metallurgy high-speed steel, and can effectively reduce the manufacturing cost. The invention also discloses a manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar.
Description
Technical Field
The invention relates to the technical field of metal materials and metallurgical rolls, in particular to a high-carbon high-vanadium powder high-speed steel composite roll collar and a manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar.
Background
The hard alloy roll collar has the advantages of high hardness, high compressive strength, good wear resistance, good corrosion resistance, small friction coefficient, low thermal conductivity, long service life, high precision of rolled products, good quality and the like compared with the traditional roll collar made of other materials, and is commonly used for high-speed wire rod rolling.
At present, the centrifugal casting process of a roll body and a core filling casting roll shaft is mostly adopted for high-speed steel rolls and high-speed steel roll collars/roll sleeves, and the following defects are mainly adopted: when the boron content of the outer layer of the roller is high, the density difference exists between boride formed by other elements and an iron matrix, and the boride and carbide with high density can segregate to the surface of the roller due to the action of centrifugal force during centrifugal casting; bad bonding between the inner and outer layer interfaces; alloy elements of the outer layer are easy to diffuse to the core part to form a large amount of carbides, so that the brittleness of the ductile iron material of the core part is increased, the impact resistance is reduced, and roll breakage accidents are easy to happen in the steel rolling process; the integral quenching process is adopted, so that the hardness gradient is large, the heat treatment period is long, and the cost is high; fifthly, after the outer layer of high-speed steel material is abraded, the roller core can be recycled only by re-smelting, so that the waste of materials and energy is caused.
The powder metallurgy high speed steel is high speed steel obtained by atomizing high speed molten steel with high pressure inert gas or high pressure water to obtain fine high speed steel powder, then pressing the fine high speed steel powder at high temperature and high pressure to form a shape, and sintering the shape. The powder metallurgy high-speed steel has the characteristics of high alloy content, high purity, no segregation, fine carbide particles, isotropy and the like, so that the powder metallurgy high-speed steel has excellent toughness and machinability, good red hardness, higher compressive strength and high wear resistance, can replace hard alloy in cutting machining and die abrasion occasions with large impact load, and is widely applied.
Compared with the traditional casting high-speed steel, the powder metallurgy high-speed steel still has the characteristics of high raw material price, complex process and the like, so the powder metallurgy high-speed steel is not widely applied in the technical field of rollers on a large scale. The research on a composite roll collar with lower cost and higher strength performance and toughness performance is a problem which needs to be solved by the technical personnel in the field urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-carbon high-vanadium powder high-speed steel composite roll collar and a manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar. In order to solve the problems, the invention provides a high-carbon high-vanadium powder high-speed steel composite roll collar, which has the technical scheme that:
the invention relates to a high-carbon high-vanadium powder high-speed steel composite roll collar, which comprises: the inner-layer steel pipe is a prefabricated cylindrical inner steel pipe, and the outer-layer powder high-speed steel is a cylindrical high-speed steel pipe which is coated on the periphery of the inner-layer steel pipe through a hot isostatic pressing method; the ratio of the thickness of the inner layer steel pipe to the thickness of the outer layer powder high-speed steel is 1: (0.6-1.5).
Compared with the high-speed steel roll collar in the prior art, the high-carbon high-vanadium powder high-speed steel composite roll collar has the advantages that the alloy powder is manufactured into the high-speed steel outer ring by the hot isostatic pressing method, the manufactured high-speed steel outer ring is combined with the prefabricated inner steel pipe to form the high-carbon high-vanadium powder high-speed steel composite roll collar, the manufactured high-speed steel outer ring on the outer layer is tightly attached to the periphery of the inner steel pipe while the abrasion resistance, the hardness and the compressive strength are achieved, the metallurgical bonding performance is achieved, the bonding degree of the inner layer and the outer layer is higher and better, and the overall performance and the stability of the roll collar are further improved. On the other hand, researchers of the invention adjust the thickness proportion of the inner layer steel pipe and the outer layer high-speed steel through multiple tests and multiple field verifications, so that the optimal combination of corrosion resistance, strength and pressure resistance is realized, and specific test data are shown in the embodiment part.
As a further improvement of the invention, a plurality of protrusions or pits are preformed on the outer pipe surface of the inner layer steel pipe, and the protruding height of the protrusions or the concave depth of the pits is 1/15-1/6 of the thickness of the inner layer steel pipe; or a plurality of annular convex ribs or grooves are preformed on the outer pipe surface of the inner-layer steel pipe, and the protruding height of the convex ribs or the concave depth of the grooves is 1/15-1/6 of the thickness of the inner-layer steel pipe. Like this for the adhesion nature of the alloy powder high-speed steel of system now and inlayer steel pipe is better, and the compound collars wholeness that both combine improves greatly, can avoid the axial between the ectonexine to move in the use of collars completely, has improved the life of collars.
Further, the chemical components of the inner layer steel pipe and the mass percentage of each component are as follows: c: 0.32 to 0.4 percent of Fe, 0.8 to 1.0 percent of Si, 0.2 to 0.3 percent of Mn, 4.8 to 5.5 percent of Cr, 1.1 to 1.7 percent of Mo, 0.8 to 1.2 percent of V, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities.
Further, the chemical components of the outer-layer powder high-speed steel (2) and the mass percentage of the components are as follows: c: 2.5 to 3.2 percent of Fe, 0.5 to 1.0 percent of Si, 0.3 to 0.8 percent of Mn, 2.0 to 4.0 percent of W, 3 to 8 percent of Mo, 8 to 11 percent of V, 4 to 6 percent of Cr, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities.
The invention relates to a manufacturing method of a high-carbon high-vanadium powder high-speed steel composite roll collar, which comprises the following steps:
firstly, manufacturing an inner steel pipe according to a preset size and chemical components, and cleaning and removing impurities for later use; and manufacturing a hot isostatic pressing sheath according to a preset size, and assembling the hot isostatic pressing sheath and the inner layer steel pipe.
And secondly, preparing alloy powder for outer-layer powder high-speed steel according to predetermined chemical components, wherein the granularity of the alloy powder is 40-100 microns, filling the space between the inner-layer steel pipe and the hot isostatic pressing sheath in the city surrounded by the alloy powder, and welding and sealing the inner-layer steel pipe and the hot isostatic pressing sheath by using electron beams in a vacuum environment.
Thirdly, sintering and molding the alloy powder into the outer-layer powder high-speed steel by using a hot isostatic pressing composite process, wherein the parameters of the hot isostatic pressing composite process are as follows: the temperature is 1020-1280 ℃, the pressure is 130-180 MPa, and the heat preservation time is 1.5-4 h.
And fourthly, after the hot isostatic pressing compounding process, carrying out annealing, quenching and tempering heat treatment procedures, and removing the sheath for hot isostatic pressing to manufacture the composite roll collar.
Compared with the manufacturing method of the high-speed steel composite roll collar in the prior art, the manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar has the advantages that the inner ring and the outer ring of the high-speed steel composite roll collar in the prior art are usually assembled after prefabrication, and at most, after the assembly, the outer ring is subjected to further heat treatment, so that the inner ring and the outer ring have interference, and the interference assembly can cause the outer ring to be foamed or expand to damage the outer ring during rolling; and axial crosstalk between the inner and outer layers can occur once the interference disappears. According to the manufacturing method, the alloy powder for manufacturing the outer-layer high-speed steel is filled in the wrapping sleeve on the periphery of the inner-layer steel pipe, the alloy powder is sintered and molded to form the outer ring through the hot isostatic pressing method, namely prefabrication and on-site manufacturing are combined, so that the outer layer of the high-speed steel is tightly combined on the periphery of the inner-layer steel pipe, and as part of alloy can permeate into the inner-layer steel pipe in the hot isostatic pressing sintering process of the alloy powder, good metallurgical bonding is formed, the alloy powder and the inner-layer steel pipe basically form an integral structure, and the integrity, the hardness and the strength are greatly.
Further, in the first step, the hot isostatic pressing capsule comprises a capsule inner tube, a capsule outer tube, a capsule bottom plate and a capsule cover, wherein the outer diameter of the capsule inner tube is 0.3-1 mm smaller than the inner diameter of the inner steel tube, and the radial length of the capsule inner tube is 1-2 mm longer than that of the inner steel tube; the hot isostatic pressing sheath and the inner steel pipe are coaxially assembled, during assembly, the sheath inner pipe is sleeved inside the inner steel pipe, the sheath outer pipe is sleeved outside the inner steel pipe, the sheath bottom plate is embedded between the sheath inner pipe and the bottom of the sheath outer pipe and then welded, alloy powder is filled between the inner steel pipe and the inner steel pipe, and the sheath cover is pressed between the sheath inner pipe and the top of the sheath outer pipe in a vacuum environment and then welded. The outer diameter of the sheath inner pipe is 0.3mm-1mm smaller than the inner diameter of the inner layer steel pipe, namely a certain space is left between the sheath inner pipe and the inner layer steel pipe after coaxial assembly, so that the inner layer steel pipe can expand inwards when the temperature is raised, the space of the high-speed steel which is compressed only by expanding outwards to the radius is avoided, and a gap is formed between the outer layer of the high-speed steel and the inner layer steel pipe due to cold contraction when the high-speed steel is cooled.
Further, in the second step, the pressure of the vacuum environment before the hot isostatic pressing sheath is welded and sealed is equal to or less than 1 × 10-3Pa。
Further, in the fourth step, the annealing process is as follows: keeping the temperature at 950-1030 ℃ for 3-6 h, cooling the furnace to below 500 ℃ and cooling the furnace to normal temperature; the quenching process comprises the following steps: 1050-1150 ℃, preserving heat for 2-4 h, furnace cooling at a temperature of more than or equal to 200 ℃/h or oil cooling to below 500 ℃, and then air cooling to normal temperature; the tempering process comprises the following steps: keeping the temperature at 530-570 ℃ for 2-4 h, cooling in a furnace or air cooling to room temperature, and tempering for 2-3 times in the same process.
The high-carbon high-vanadium powder high-speed steel composite roll collar and the manufacturing method thereof have the beneficial effects that:
the alloy powder is manufactured into the high-speed steel outer ring in situ by adopting a hot isostatic pressing method, the manufactured high-speed steel outer ring is combined with the prefabricated inner-layer steel pipe to form the high-carbon high-vanadium powder high-speed steel composite roll ring, the outer-layer manufactured high-speed steel outer ring is tightly attached to the periphery of the inner-layer steel pipe while the wear resistance, the hardness and the compressive strength are achieved, and the metallurgical bonding performance is achieved, so that the bonding degree of the inner layer and the outer layer is higher and better, and the overall performance and the stability of the roll ring are further improved. On the other hand, researchers of the invention adjust the thickness proportion of the inner layer steel pipe and the outer layer high-speed steel through multiple tests and multiple field verifications, so that the optimal combination of corrosion resistance, strength and pressure resistance is realized, and specific test data are shown in the embodiment part.
The outer layer of the high-speed steel is manufactured on site by adopting a hot isostatic pressing method, namely alloy powder for manufacturing the outer layer of the high-speed steel is filled in a jacket on the periphery of the inner layer steel pipe, the alloy powder is sintered and molded into an outer ring by the hot isostatic pressing method, namely prefabrication and on-site manufacturing are combined, so that the outer layer of the high-speed steel is tightly combined on the periphery of the inner layer steel pipe, and because part of alloy can permeate into the inner layer steel pipe in the hot isostatic pressing sintering process of the alloy powder, good metallurgical bonding is formed, the two basically form an integral structure, and the integrity, the hardness and the strength are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic longitudinal cross-sectional structural view of a first form of the high carbon high vanadium powder high speed steel composite roll collar of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional structural view of a second form of the high carbon high vanadium powder high speed steel composite roll collar of the present invention;
FIG. 3 is a schematic longitudinal sectional structure of a third form of the high carbon high vanadium powder high speed steel composite roll collar of the present invention;
FIG. 4 is a schematic longitudinal cross-sectional structural view of a fourth form of the high carbon high vanadium powder high speed steel composite roll collar of the present invention;
FIG. 5 is a schematic longitudinal sectional structure of a fifth form of the high carbon high vanadium powder high speed steel composite roll collar of the present invention;
FIG. 6 is a schematic longitudinal cross-sectional view of a capsule for hot isostatic pressing in the method of manufacturing a high carbon, high vanadium powder high speed steel composite roll collar of the present invention;
fig. 7 is a schematic longitudinal sectional structure of the hot isostatic pressing capsule in the manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar.
The figures are labeled as follows:
1-inner layer steel pipe; 11-a protrusion; 12-pits; 13-a rib; 14-a groove; 2-outer layer powder high-speed steel; 3-a sheath for hot isostatic pressing; 31-sheathing the inner tube; 32-sheathing the outer tube; 33-sheathing the bottom plate; 34-covering the cover.
Detailed Description
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are described below with reference to the accompanying drawings.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1 to 5, a high-carbon high-vanadium powder high-speed steel composite roll collar of the present embodiment includes: the steel pipe comprises an inner layer steel pipe 1 and an outer layer powder high-speed steel 2, wherein the inner layer steel pipe 1 is a prefabricated cylindrical inner steel pipe, and the outer layer powder high-speed steel 2 is a cylindrical high-speed steel pipe which is coated on the periphery of the inner layer steel pipe 1 through a hot isostatic pressing method; the ratio of the thickness of the inner layer steel pipe 1 to the thickness of the outer layer powder high-speed steel 2 is 1: (0.6-1.5). Preferably, the ratio of the thickness of the inner layer steel pipe 1 to the thickness of the outer layer powder high-speed steel 2 is 1: (0.9-1.2).
As a further improvement mode of the embodiment, referring to FIGS. 2 and 3, a plurality of protrusions 11 or pits 12 are preformed on the outer pipe surface of the inner layer steel pipe 1, and the protruding height of the protrusions 11 or the concave depth of the pits 12 is 1/15-1/6 of the thickness of the inner layer steel pipe 1. The protrusions 11 and the recesses 12 may be individually disposed on the outer surface of the inner steel pipe 1, or may be simultaneously disposed on the outer surface of the inner steel pipe 1, and the shape and structure of the protrusions 11 and the recesses 12 may be square protrusions/recesses, cylindrical protrusions/recesses, spherical protrusions/recesses, or protrusions/recesses with irregular shapes.
Referring to fig. 4 and 5, a plurality of annular convex ribs 13 or concave grooves 14 are preformed on the outer pipe surface of the inner steel pipe 1, and the protruding height of the convex ribs 13 or the concave depth of the concave grooves 14 is 1/15-1/6 of the thickness of the inner steel pipe 1. The convex ribs 13 and the concave grooves 14 can be arranged on the outer pipe surface of the inner steel pipe 1 independently or arranged on the outer pipe surface of the inner steel pipe 1 simultaneously, and the shape structures of the convex ribs 13 and the concave grooves 14 can be square convex ribs/concave grooves, semicircular convex ribs/concave grooves, inverted trapezoidal convex ribs/concave grooves or convex ribs/concave grooves with other irregular shape structures.
In a further preferred embodiment, the chemical components of the inner steel pipe 1 and the mass percentages of the components are as follows: c: 0.32 to 0.4 percent of Fe, 0.8 to 1.0 percent of Si, 0.2 to 0.3 percent of Mn, 4.8 to 5.5 percent of Cr, 1.1 to 1.7 percent of Mo, 0.8 to 1.2 percent of V, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities. Preferably, the chemical components of the inner layer steel pipe 1 and the mass percentage of each component are as follows: c: 0.35 to 0.38 percent of Fe, 0.85 to 0.95 percent of Si, 0.23 to 0.26 percent of Mn, 5.0 to 5.2 percent of Cr, 1.3 to 1.5 percent of Mo, 0.95 to 1.05 percent of V, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
The outer layer powder high-speed steel 2 comprises the following chemical components in percentage by mass: c: 2.5 to 3.2 percent of Fe, 0.5 to 1.0 percent of Si, 0.3 to 0.8 percent of Mn, 2.0 to 4.0 percent of W, 3 to 8 percent of Mo, 8 to 11 percent of V, 4 to 6 percent of Cr, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities. Preferably, the chemical components and the mass percentage of the components of the outer layer powder high-speed steel 2 are as follows: c: 2.8 to 3.0 percent of Fe, 0.75 to 0.80 percent of Si, 0.45 to 0.65 percent of Mn, 2.5 to 3.5 percent of W, 4.5 to 6.5 percent of Mo, 9 to 10 percent of V, 4.5 to 5.5 percent of Cr, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, and the balance of Fe and inevitable impurities.
Example two
Referring to fig. 6 and 7, a method for manufacturing a high-carbon high-vanadium powder high-speed steel composite roll collar of the present embodiment includes the following steps:
firstly, manufacturing an inner-layer steel pipe 1 according to a preset size and chemical components, and cleaning and removing impurities for later use; the hot isostatic pressing capsule 3 is manufactured according to a predetermined size, and the hot isostatic pressing capsule 3 is assembled with the inner layer steel pipe 1.
And secondly, preparing alloy powder for the outer-layer powder high-speed steel 2 according to predetermined chemical components, wherein the granularity of the alloy powder is 40-100 microns, filling the space surrounded by the inner-layer steel pipe 1 and the hot isostatic pressing sheath 3 with the alloy powder, and welding and sealing the inner-layer steel pipe 1 and the hot isostatic pressing sheath 3 by using electron beams in a vacuum environment.
Thirdly, sintering and molding the alloy powder into outer-layer powder high-speed steel 2 by using a hot isostatic pressing composite process, wherein the parameters of the hot isostatic pressing composite process are as follows: the temperature is 1020-1280 ℃, the pressure is 130-180 MPa, and the heat preservation time is 1.5-4 h. Preferably, the parameters of the hot isostatic pressing composite process are: the temperature is 1100-1250 ℃, the pressure is 145-160 MPa, and the heat preservation time is 2.5-3.5 h; further preferably, the parameters of the hot isostatic pressing composite process are: the temperature is 1150-1200 ℃, the pressure is 150MPa, and the heat preservation time is 3 h.
And fourthly, after the hot isostatic pressing compounding process, carrying out annealing, quenching and tempering heat treatment procedures, and removing the sheath 3 for hot isostatic pressing to manufacture the composite roll collar.
The capsule 3 for hot isostatic pressing comprises a capsule inner tube 31, a capsule outer tube 32, a capsule bottom plate 33 and a capsule cover 34, wherein the outer diameter of the capsule inner tube 31 is 0.3-1 mm smaller than the inner diameter of the inner layer steel tube 1, and the radial length of the capsule inner tube 31 is 1-2 mm longer than the radial length of the inner layer steel tube 1.
The hot isostatic pressing capsule 3 and the inner steel tube 1 are coaxially assembled, during assembly, the capsule inner tube 31 is sleeved inside the inner steel tube 1, the capsule outer tube 32 is sleeved outside the inner steel tube 1, the capsule bottom plate 33 is embedded between the capsule inner tube 31 and the bottom of the capsule outer tube 32 and then welded, alloy powder is filled between the inner steel tube 1 and the inner steel tube 1, and the capsule cover 34 is pressed between the capsule inner tube 31 and the top of the capsule outer tube 32 in a vacuum environment and then welded. Thus, a certain expansion space is left between the assembled sheath inner pipe 31 and the inner steel pipe 1, and a filling space of alloy powder is formed between the inner steel pipe 1 and the sheath outer pipe 32. The welding between the sheath bottom plate 33 and the sheath cover 34 and the sheath inner tube 31 and the sheath outer tube 32 adopts electron beam seal welding.
In a further alternative embodiment, in the second step, the vacuum environment before the weld sealing of the capsule 3 for hot isostatic pressing is 1 × 10 or less-3Pa。
In the fourth step, the annealing process is as follows: keeping the temperature at 950-1030 ℃ for 3-6 h, cooling the furnace to below 500 ℃ and cooling the furnace to normal temperature; the quenching process comprises the following steps: 1050-1150 ℃, preserving heat for 2-4 h, furnace cooling at a temperature of more than or equal to 200 ℃/h or oil cooling to below 500 ℃, and then air cooling to normal temperature; the tempering process comprises the following steps: keeping the temperature at 530-570 ℃ for 2-4 h, cooling in a furnace or air cooling to room temperature, and tempering for 2-3 times in the same process.
The hardness, impact toughness and other indexes of the high-carbon high-vanadium powder high-speed steel composite roll collar manufactured according to the embodiment are as follows through detection:
| macroscopic Hardness (HSD) | Impact toughness (J/cm)2) | Density (g/cm)3) | |
| Composite roll collar powder alloy layer | 79～83 | 8～12 | 7.56 |
| YG30 hard alloy roller ring | 81～84 | 6～10 | 13.6 |
| Centrifugally cast high speed steel | 84～87 | 3～6 | 7.85 |
The high-carbon high-vanadium powder high-speed steel composite roll collar, the YG30 hardness alloy roll collar and the cast high-speed steel roll collar of the application use a high-speed wire rod pre-finish rolling same frame (17 frames), and the steel passing index and the abrasion loss index are compared as follows:
| single groove steel excess (ton) | Wear loss of groove bottom (mm) | |
| Powder high-speed steel composite roll collar | 6000～7200 | 0.3～0.35 |
| YG30 hard alloy roller ring | 5000～6000 | 0.2～0.25 |
| Casting high speed steel | 1000～2000 | 0.3～0.4 |
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. A high-carbon high-vanadium powder high-speed steel composite roll collar, characterized in that it comprises: the steel pipe comprises an inner layer steel pipe (1) and an outer layer powder high-speed steel (2), wherein the inner layer steel pipe (1) is a prefabricated cylindrical inner steel pipe, and the outer layer powder high-speed steel (2) is a cylindrical high-speed steel pipe which is coated on the periphery of the inner layer steel pipe (1) through a hot isostatic pressing method;
the ratio of the thickness of the inner layer steel pipe (1) to the thickness of the outer layer powder high-speed steel (2) is 1: (0.6-1.5).
2. The high-carbon high-vanadium powder high-speed steel composite roll collar as claimed in claim 1, characterized in that a plurality of protrusions (11) or pits (12) are preformed on the outer surface of the inner steel pipe (1), and the protruding height of the protrusions (11) or the concave depth of the pits (12) is 1/15-1/6 of the thickness of the inner steel pipe (1);
or a plurality of annular convex ribs (13) or grooves (14) are preformed on the outer pipe surface of the inner-layer steel pipe (1), and the protruding height of the convex ribs (13) or the concave depth of the grooves (14) is 1/15-1/6 of the thickness of the inner-layer steel pipe (1).
3. The high-carbon high-vanadium powder high-speed steel composite roll collar as claimed in claim 1 or 2, wherein the chemical components and mass percentages of the components of the inner steel pipe (1) are as follows:
c: 0.32 to 0.4 percent of Fe, 0.8 to 1.0 percent of Si, 0.2 to 0.3 percent of Mn, 4.8 to 5.5 percent of Cr, 1.1 to 1.7 percent of Mo, 0.8 to 1.2 percent of V, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities.
4. The high-carbon high-vanadium powder high-speed steel composite roll collar as claimed in claim 1 or 2, wherein the chemical components and mass percentages of the components of the outer layer powder high-speed steel (2) are as follows:
c: 2.5 to 3.2 percent of Fe, 0.5 to 1.0 percent of Si, 0.3 to 0.8 percent of Mn, 2.0 to 4.0 percent of W, 3 to 8 percent of Mo, 8 to 11 percent of V, 4 to 6 percent of Cr, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities.
5. The manufacturing method of the high-carbon high-vanadium powder high-speed steel composite roll collar is characterized by comprising the following steps of:
firstly, manufacturing an inner-layer steel pipe (1) according to a preset size and chemical components, and cleaning and removing impurities for later use; manufacturing a hot isostatic pressing sheath (3) according to a preset size, and assembling the hot isostatic pressing sheath (3) and the inner-layer steel pipe (1);
preparing alloy powder for the outer-layer powder high-speed steel (2) according to predetermined chemical components, wherein the granularity of the alloy powder is 40-100 mu m, filling the space enclosed by the inner-layer steel pipe (1) and the hot isostatic pressing sheath (3) with the alloy powder, and welding and sealing the inner-layer steel pipe (1) and the hot isostatic pressing sheath (3) by using electron beams in a vacuum environment;
thirdly, sintering and molding the alloy powder into the outer-layer powder high-speed steel (2) by using a hot isostatic pressing composite process, wherein the parameters of the hot isostatic pressing composite process are as follows: the temperature is 1020-1280 ℃, the pressure is 130-180 MPa, and the heat preservation time is 1.5-4 h;
and fourthly, after the hot isostatic pressing compounding process, carrying out annealing, quenching and tempering heat treatment procedures, and dismantling the hot isostatic pressing sheath (3) to manufacture the composite roll collar.
6. The manufacturing method according to claim 5, wherein in step one, the capsule (3) for hot isostatic pressing comprises a capsule inner tube (31), a capsule outer tube (32), a capsule bottom plate (33) and a capsule cover (34), wherein the outer diameter of the capsule inner tube (31) is smaller than the inner diameter of the inner steel tube (1) by 0.3mm to 1mm, and the radial length of the capsule inner tube (31) is longer than the radial length of the inner steel tube (1) by 1mm to 2 mm;
the hot isostatic pressing sheath (3) and the inner steel pipe (1) are coaxially assembled, during assembly, the sheath inner pipe (31) is sleeved inside the inner steel pipe (1), the sheath outer pipe (32) is sleeved outside the inner steel pipe (1), the sheath bottom plate (33) is embedded between the sheath inner pipe (31) and the bottom of the sheath outer pipe (32) and then welded, alloy powder is filled between the inner steel pipe (1) and the inner steel pipe (1), and the sheath cover (34) is pressed and buckled between the sheath inner pipe (31) and the top of the sheath outer pipe (32) in a vacuum environment and then welded.
7. A method according to claim 5 or 6, characterized in that in step two the capsule (3) for hot isostatic pressing is welded shutThe former vacuum environment is a pressure equal to or less than 1 × 10-3Pa。
8. The manufacturing method according to claim 5 or 6, wherein in the fourth step, the annealing process is: keeping the temperature at 950-1030 ℃ for 3-6 h, cooling the furnace to below 500 ℃ and cooling the furnace to normal temperature;
the quenching process comprises the following steps: 1050-1150 ℃, preserving heat for 2-4 h, furnace cooling at a temperature of more than or equal to 200 ℃/h or oil cooling to below 500 ℃, and then air cooling to normal temperature;
the tempering process comprises the following steps: keeping the temperature at 530-570 ℃ for 2-4 h, cooling in a furnace or air cooling to room temperature, and tempering for 2-3 times in the same process.
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