CN109513903A - A kind of low-carbon high-boron wear-resistant alloy roll and preparation method thereof - Google Patents
A kind of low-carbon high-boron wear-resistant alloy roll and preparation method thereof Download PDFInfo
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- CN109513903A CN109513903A CN201811400351.6A CN201811400351A CN109513903A CN 109513903 A CN109513903 A CN 109513903A CN 201811400351 A CN201811400351 A CN 201811400351A CN 109513903 A CN109513903 A CN 109513903A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
The invention discloses a kind of preparation methods of low-carbon high-boron wear-resistant alloy roll.The preparation method includes the following steps: to be packed into mold after being surface-treated transition zone, and concentric with mold；Melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, casting forms working lining, and Dual-metal roller set is formed in conjunction with transition zone；Dual-metal roller set is made annealing treatment；Dual-metal roller after annealing is covered and is assembled with roll shaft, and Dual-metal roller set outer circle is processed by design specification and rolled piece specification；Fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.The preparation method of low-carbon high-boron wear-resistant alloy roll provided by the invention cancels integral quenching technique, reduces heat treatment expense, and be formed with fine grain sclerotic tissue in rolling face, improves the hardness and wearability of roll working lining.The present invention also provides the low-carbon high-boron wear-resistant alloy rolls being prepared by the preparation method.
Description
Technical field
The present invention relates to technical field of metal material, in particular to a kind of low-carbon high-boron wear-resistant alloy roll and its preparation side
Method.
Background technique
Roll is the common consumable part in Rolling production, and the quality of roll is directly related to the production efficiency of milling train and rolls
The surface quality and Rolling production cost of material, improving roll quality has important meaning to steel rolling.In the application, abrasion is to roll
One of one major reason of roll consumption and the principal mode of its failure, therefore research and development a new generation wear-resistant material, subtract
Less wear equally has great importance.
In order to improve the intensity, hardness and wearability of material, the excellent high speed of multiple performance has been successfully developed both at home and abroad
Steel；Containing rare elements such as more chromium, molybdenum, nickel in these materials, production cost is higher, and the market competitiveness is weak；In high-speed steel
In plus the appropriate boron of people, the carbon-boron compound of high rigidity can be formed, can control the body of Boronic compound hard phase by controlling boron content
Control base carbon may be implemented in fraction, control phosphorus content, then controls the performance of matrix, wear-resisting so as to improve high-speed steel
Property；Wherein the high boron carbon steel of low-carbon has the characteristics that alloy dosage is few, at low cost, melting is simple, casting character is excellent；And China
Boron resource is abundant, is boron resource big country few in number in the world；Therefore China is suitble to develop high boron high-performance steel iron material.
Currently, high-speed steel roll, high boron roll mostly use the centrifugal casting body of roll to be filled with the technique of core casting roll shaft, mainly have
Following disadvantage: 1. when skin of the roll boron content is high, the boride and iron matrix formed with other elements there are density variation, from
When the heart is cast, due to the effect of centrifugal force, highdensity boride and carbide can be segregated to roller surface；2. inside and outside bed boundary
In conjunction with bad；3. the alloying element of outer layer readily diffuses into core and forms a large amount of carbide, cause core ductile iron material brittleness
Increase, shock resistance decline, roll breakage accident easily occurs in rolling process；4. using integral quenching technique, hardness gradient is big,
Heat treatment cycle is long, at high cost；5. after the abrasion of outer layer high speed steel material, roller core only has melting to be again just able to achieve to recycle
Problem causes the waste of material and the energy.
In consideration of it, it is necessary to provide a kind of new techniques to solve above-mentioned technical problem.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned technical problem, a kind of low-carbon high-boron wear-resistant alloy roll and its preparation side are provided
Method, low-carbon high-boron wear-resistant alloy rolling face are formed with fine grain sclerotic tissue, thus can be improved roll working lining hardness and
Wearability；Preparation method cancel integral quenching technique, only to body surface carry out hardening and fine grain treatment, simple process, heat at
Reason expense is low.
To solve the above-mentioned problems, technical scheme is as follows:
A kind of preparation method of low-carbon high-boron wear-resistant alloy roll, the roll include roll shaft and are sheathed on the roll shaft
Dual-metal roller set, the Dual-metal roller set includes transition zone and working lining, and the working lining uses low-carbon high-boron wear-resistant alloy, institute
The preparation method for stating roll includes the following steps:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms work
Make layer, and forms Dual-metal roller set in conjunction with transition zone；
Step S3: Dual-metal roller set is made annealing treatment；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to double
Metallic roll set outer circle is processed；
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
Further, the low-carbon high-boron wear-resistant alloy includes following ingredient by weight percentage:
C:0.05~0.3%；B:2.0~4.0%；Si:0.5~1.0%；Mn:0.3~1.0%；Cr:10~18%；
Ni:0.2~1.5%；Mo:0.5~1.5%；Ti:0.2~1.0%；W:0.1~1.0%；Surplus be Fe and inevitably it is miscellaneous
Matter.
Further, in step S2, pouring temperature is 1380-1500 DEG C；
In step S3, annealing process are as follows: annealing temperature is 870-950 DEG C, soaking time 4-6h.
Further, it in step S5, is carried out using the working face of plasma arc, laser beam or electron beam technology to roll fast
Speed scanning, forms fine grain sclerotic tissue layer.
Further, the power of plasma arc, laser beam or electronics beam scanning rolling face is 3000-4500W, is swept
Retouching linear velocity is 200-300mm/min.
Further, the surface in situ of the rolling face, which generates, contains TiB2The fine grain sclerotic tissue layer of phase is described thin
Brilliant sclerotic tissue layer is carbon, boron compound, mainly includes TiB2、Cr2B、CrB2、Fe2B、Cr7C3And B4C。
Further, the fine grain sclerotic tissue layer with a thickness of 0.1-1.5mm.
Further, in step S1, transition zone, which is carried out surface treatment, includes:
Transition zone removing surface is clean, and apply antioxidizing paint；
The transition zone for applying antioxidizing paint is preheated, preheating temperature is 300-800 DEG C.
Further, the surface of the Dual-metal roller set is machined with hole slot by rolled piece specification, and the working face of the roll is
Hole rooved face.
The present invention provides a kind of low-carbon high-boron wear-resistant alloy roll.The low-carbon high-boron wear-resistant alloy roll include roll shaft and
It is sheathed on the Dual-metal roller set of the roll shaft, the Dual-metal roller set includes transition zone and working lining, and the working lining is using low
Carbon high-boron wear-resistant alloy, surface are formed with fine grain sclerotic tissue layer.
Compared to the prior art, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, beneficial effect
It is:
One, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, using plasma arc, laser beam or
Electron beam technology is quickly scanned in Dual-metal roller set working face, is melted roll surface metal regional area in moment, then
It is quickly absorbed by cold conditions matrix, quickly solidification cooling, so that working face is generated fine grain sclerotic tissue, to improve roll surface working lining
Hardness and wearability.
Two, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, using roll sleeve type combined roll knot
Structure cancels integral quenching technique, only carries out hardening and fine grain treatment to body surface, and it is low to be heat-treated expense for simple process；Double gold
Belonging to roller set has the characteristics that interior tough and outer hard, meets the applying working condition of roll complexity, highly-safe.
Three, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, is taken in working layer using boron
In generation, the expensive alloying elements such as tungsten, molybdenum, vanadium, face surface in-situ preparation contained TiB in the prior art2The fine grain sclerotic tissue of phase,
The feature that intensity is high, wearability is good can be met, reduce production cost.
Four, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, the fine grain hardening that working face is formed
Organized layer with a thickness of 0.1-1.5mm, the drafts for making roll wear amount work with roll is suitable, roll in use with
Rolled piece is contacted and is worn, and carries out turnery processing to roll after fine grain sclerotic tissue layer is all worn, and it is thin to re-start surface
It can be reused after brilliant cure process.Low-carbon high-boron wear-resistant alloy roll provided by the invention carries out reprocessing process to roll
In, loaded vehicle thickness is small, only Wear layer thickness, greatly improves loaded vehicle number, increases the access times of roll, and then improve
Total steel transportation amount of roll reduces the consumption of ton steel roll.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of low-carbon high-boron wear-resistant alloy roll provided by the invention；
Fig. 2 is the metallographic microscope of working lining in the roll of low-carbon high-boron wear-resistant alloy shown in Fig. 1；
Fig. 3 is fine grain sclerotic tissue layer metallographic partial enlarged view in working lining shown in Fig. 2.
Specific embodiment
Technical solution in embodiment in order to enable those skilled in the art to better understand the present invention, and make of the invention
Above objects, features, and advantages can be more obvious and easy to understand, is further described below to a specific embodiment of the invention.
It should be noted that being used to help understand the present invention for the explanation of these embodiments, but do not constitute
Limitation of the invention.In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other
Between do not constitute conflict and can be combined with each other.
Referring to Fig. 1, being the structural schematic diagram of low-carbon high-boron wear-resistant alloy roll provided by the invention.It is provided by the invention
Low-carbon high-boron wear-resistant alloy roll 100 includes roll shaft 1 and the Dual-metal roller being sheathed on outside roll shaft 1 set 2.Wherein roll shaft 1 uses ball
Iron or steel are made；Dual-metal roller set 2 includes the transition zone 21 and working lining 22 set gradually.Transition zone 21 is sheathed on roll shaft 1
On, working lining 22 coats transition zone 21, contacts with rolled piece.
In the present embodiment, transition zone 21 and roll shaft 1 use ordinary low-carbon steel seamless pipe, naturally it is also possible to use other materials
Instead of；Working lining 22 is made of low-carbon high-boron wear-resistant alloy.In the present embodiment, low-carbon high-boron wear-resistant alloy is replaced existing using boron
There are the expensive alloying elements such as tungsten in technology, molybdenum, vanadium comprising following ingredient by weight percentage:
C:0.05~0.3%；B:2.0~4.0%；Si:0.5~1.0%；Mn:0.3~1.0%；Cr:10~18%；
Ni:0.2~1.5%；Mo:0.5~1.5%；Ti:0.2~1.0%；W:0.1~1.0%；Surplus be Fe and inevitably it is miscellaneous
Matter.
Working lining 22 includes the working face and peripheral part that roll and rolled piece directly contact；According to the model of rolled piece and rule
Lattice, working lining 22 have different shapes.It such as is machined with multiple hole slots (not shown) by rolled piece specification on 22 surface of working lining, it should
Hole groove location is the working face of roll.
Low-carbon high-boron wear-resistant alloy roll provided by the invention is being rolled using techniques such as ion arc, laser beam or electron beams
The working face of roller forms fine grain sclerotic tissue layer (not labeled).Fig. 2 and Fig. 3 are please referred to, wherein Fig. 2 is low-carbon shown in Fig. 1
The metallographic microscope of working lining in high-boron wear-resistant alloy roll；Fig. 3 is that fine grain sclerotic tissue layer metallographic is locally put in working lining shown in Fig. 2
Big figure.It is expressed as working lining matrix metallographic, transition from the bottom to top according to the difference of structure in metallographic microscope shown in Fig. 2
Metallographic, fine grain harden metallographic.It can thus be seen that by carrying out fine grain cure process to face surface, in rolling face
Surface form one layer of fine and close metallographic layer, improve the quality of rolling face, reduce the alloy of roll radial direction section
Element segregation keeps roll surface ingredient uniform, and performance is stablized, to improve the hardness and wearability of rolling face.
Low-carbon high-boron wear-resistant alloy roll provided by the invention, preparation method include following technique:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms work
Make layer, and forms Dual-metal roller set in conjunction with transition zone；
Step S3: Dual-metal roller set is made annealing treatment；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to double
Metallic roll set outer circle is processed；
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
The preparation side of low-carbon high-boron wear-resistant alloy roll provided by the invention is elaborated below by way of specific embodiment
Method.
Embodiment 1
The low-carbon high-boron wear-resistant alloy roll of the present embodiment, working lining 22 use low-carbon high-boron wear-resistant alloy, outer diameter Ф
380mm, with a thickness of 55mm；Transition zone 21 uses low-carbon steel seamless steel tube, outer diameter Ф 273mm, thickness 25mm；Roll shaft is magnesium iron
Axis.
A kind of preparation method of low-carbon high-boron wear-resistant alloy roll, includes the following steps:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Specifically, the low-carbon steel seamless steel tube of transition zone 21 selects 20# steel, surface treatment includes:
Turnery processing is carried out to outer diameter, removes surface scale and impurity, processing dimension to Ф 268mm, surface roughness
Ra6.3；
It is watered in seamless steel pipe painting 2mm borax and does protection against oxidation agent；
The seamless steel pipe for coating borax water is put into electric furnace and carries out the pre-heat treatment, preheating temperature is 600 DEG C.
Mold internal diameter is 410mm, mould inner surface brush 2mm graphite paint；When the built-in seamless steel pipe of mold, first will preheating,
Preheating temperature is 250 degree.
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms work
Make layer, and forms Dual-metal roller set in conjunction with transition zone；
In the present embodiment, the content of the ingredient of low-carbon high-boron wear-resistant alloy and each ingredient is as follows:
C:0.05%；B:3.0%；Si:0.8%；Mn:0.3%；Cr:10%；Ni:1.0%；Mo:1.5%； Ti:
1.0%；W:0.5%；Surplus is Fe and inevitable impurity；
Alloy material is added in smelting furnace according to the above ingredient, carries out melting；
Melted alloy is poured between mould inner wall and transition zone, pouring temperature is 1380 DEG C, to molten steel solidification
Depanning afterwards lifts casting in annealing furnace with annealing.
Step S3: Dual-metal roller set is made annealing treatment；
Specifically, annealing process are as follows: control annealing temperature is 890 DEG C, soaking time 6h；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to double
Metallic roll set outer circle is processed；
It is processed specifically, covering 2 inner holes to the Dual-metal roller after annealing, processing dimension to internal diameter Ф 230mm, surface
Cu Cao Du≤Ra1.6；By the Dual-metal roller processed set 2 and 1 elastic conjunction of roll shaft, guarantee magnitude of interference is 0.2mm；It will combine
Roll Excircle machining process hole slot in roll outer circle to 380mm, and according to the use rack of roll and rolled piece specification；I.e. originally
In embodiment, the working face of roll is hole groove location.
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
Specifically, the laser beam using high-energy quickly scans rolling face, contain the generation of its surface in situ
TiB2The fine grain sclerotic tissue layer of phase, the fine grain sclerotic tissue layer are carbon, boron compound, mainly include TiB2、Cr2B、CrB2、
Fe2B、Cr7C3、B4C.The structure of fine grain sclerotic tissue layer referring to Fig. 2 and Fig. 3, fine grain sclerotic tissue layer with a thickness of 0.1-
1.5mm, the drafts for making roll wear amount work with roll are suitable.
Laser beam is selected using rectangular light spot, watt level and scanning speed according to the projected depth of thin crystal layer, this implementation
In example, power selects 4500W, and scanning linear velocity is 300mm/min.
Embodiment 2
The low-carbon high-boron wear-resistant alloy roll of the present embodiment, working lining 22 use low-carbon high-boron wear-resistant alloy, outer diameter Ф
430mm, with a thickness of 70mm；Transition zone 21 uses low-carbon steel seamless steel tube, outer diameter Ф 299mm, thickness 25mm；Roll shaft is
42CrMo steel shaft.
A kind of preparation method of low-carbon high-boron wear-resistant alloy roll, includes the following steps:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Specifically, the low-carbon steel seamless steel tube of transition zone 21 selects A3 steel, surface treatment includes:
Bead is carried out to outer diameter, removes surface scale and impurity, processing dimension to Ф 299mm, surface roughness
Ra6.3；
2mm high-temperature antioxidation protection coating layer is applied in seamless steel pipe；
The seamless steel pipe for coating high-temperature antioxidation protection coating layer is put into electric furnace and carries out the pre-heat treatment, preheating temperature is
300℃。
Mold internal diameter is 480mm, mould inner surface brush 2mm graphite paint；230 degree are preheating in mold.
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms work
Make layer, and forms Dual-metal roller set in conjunction with transition zone；
In the present embodiment, the content of the ingredient of low-carbon high-boron wear-resistant alloy and each ingredient is as follows:
C:0.3%；B:2.0%；Si:0.5%；Mn:1.0%；Cr:18%；Ni:0.2%；Mo:1.0%； Ti:
0.2%；W:1.0%；Surplus is Fe and inevitable impurity；
Alloy material is added in smelting furnace according to the above ingredient, carries out melting；
Melted alloy is poured between mould inner wall and transition zone, pouring temperature is 1500 DEG C, to molten steel solidification
Depanning afterwards lifts casting in annealing furnace with annealing.
Step S3: Dual-metal roller set is made annealing treatment；
Specifically, annealing process are as follows: control annealing temperature is 920 DEG C, soaking time 5h；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to double
Metallic roll set outer circle is processed；
It is processed specifically, covering 2 inner holes to the Dual-metal roller after annealing, processing dimension to internal diameter Ф 260mm, surface
Cu Cao Du≤Ra1.6；By the Dual-metal roller processed set 2 and 1 elastic conjunction of roll shaft, guarantee magnitude of interference is 0.25mm；It will combination
Good roll Excircle machining processes hole slot in roll outer circle to 450mm, and according to the use rack of roll and rolled piece specification；I.e.
In the present embodiment, the working face of roll is hole groove location.
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
Specifically, the electron beam using high-energy quickly scans rolling face, contain the generation of its surface in situ
TiB2The fine grain sclerotic tissue layer of phase, the fine grain sclerotic tissue layer are carbon, boron compound, mainly include TiB2、Cr2B、CrB2、
Fe2B、Cr7C3、B4C.The structure of fine grain sclerotic tissue layer referring to Fig. 2 and Fig. 3, fine grain sclerotic tissue layer with a thickness of 0.1-
1.5mm, the drafts for making roll wear amount work with roll are suitable.
Electron beam is selected using circular light spot, watt level and scanning speed according to the projected depth of thin crystal layer, this implementation
In example, power selects 3000W, and scanning linear velocity is 200mm/min.
Embodiment 3
The low-carbon high-boron wear-resistant alloy roll of the present embodiment, working lining 22 use low-carbon high-boron wear-resistant alloy, outer diameter Ф
380mm, with a thickness of 55mm；Transition zone 21 uses low-carbon steel seamless steel tube, outer diameter Ф 273mm, thickness 25mm；Roll shaft is magnesium iron
Axis.
A kind of preparation method of low-carbon high-boron wear-resistant alloy roll, includes the following steps:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Specifically, the low-carbon steel seamless steel tube of transition zone 21 selects 45# steel, surface treatment includes:
Turnery processing is carried out to outer diameter, removes surface scale and impurity, processing dimension to Ф 268mm, surface roughness
Ra6.3；
It is watered in seamless steel pipe painting 2mm borax and does protection against oxidation agent；
The seamless steel pipe for coating borax water is put into electric furnace and carries out the pre-heat treatment, preheating temperature is 800 DEG C.
Mold internal diameter is 400mm, mould inner surface brush 3mm graphite paint；When the built-in seamless steel pipe of mold, first will preheating,
Preheating temperature is 280 degree.
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms work
Make layer, and forms Dual-metal roller set in conjunction with transition zone；
In the present embodiment, the content of the ingredient of low-carbon high-boron wear-resistant alloy and each ingredient is as follows:
C:0.2%；B:4.0%；Si:1.0%；Mn:0.6%；Cr:15%；Ni:1.5%；Mo:0.5%；Ti:0.7%；
W:0.1%；Surplus is Fe and inevitable impurity；
Alloy material is added in smelting furnace according to the above ingredient, carries out melting；
Melted alloy is poured between mould inner wall and transition zone, pouring temperature is 1430 DEG C, to molten steel solidification
Depanning afterwards lifts casting in annealing furnace with annealing.
Step S3: Dual-metal roller set is made annealing treatment；
Specifically, annealing process are as follows: control annealing temperature is 950 DEG C, soaking time 4h；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to double
Metallic roll set outer circle is processed；
It is processed specifically, covering 2 inner holes to the Dual-metal roller after annealing, processing dimension to internal diameter Ф 230mm, surface
Cu Cao Du≤Ra1.6；By the Dual-metal roller processed set 2 and 1 elastic conjunction of roll shaft, guarantee magnitude of interference is 0.22mm；It will combination
Good roll Excircle machining processes hole slot in roll outer circle to 380mm, and according to the use rack of roll and rolled piece specification；I.e.
In the present embodiment, the working face of roll is hole groove location.
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
Specifically, the plasma arc using high-energy quickly scans rolling face, generate its surface in situ
Containing TiB2The fine grain sclerotic tissue layer of phase, the fine grain sclerotic tissue layer are carbon, boron compound, mainly include TiB2、Cr2B、CrB2、
Fe2B、Cr7C3、B4C.The structure of fine grain sclerotic tissue layer referring to Fig. 2 and Fig. 3, fine grain sclerotic tissue layer with a thickness of 0.1-
1.5mm, the drafts for making roll wear amount work with roll are suitable.
Plasma arc is selected using circular light spot, watt level and scanning speed according to the projected depth of thin crystal layer, this reality
It applies in example, power selects 4000W, and scanning linear velocity is 240mm/min.
The low-carbon high-boron wear-resistant alloy roll of embodiment 1-3 is tested for the property, test result such as table 1:
Table 1: rolling face the performance test results
| Thin crystal layer hardness/(HV) | Thin crystal layer thickness mm | |
| Embodiment 1 | 816 | 0.8 |
| Embodiment 2 | 830 | 0.5 |
| Embodiment 3 | 792 | 1.0 |
Low-carbon high-boron wear-resistant alloy roll provided by the invention, is hardened by fine grain it can be seen from above-mentioned test result
After processing, working face thin crystal layer hardness is high.
Low-carbon high-boron wear-resistant alloy roll provided by the invention, reduces the expensive alloying elements such as tungsten, molybdenum, vanadium on ingredient
Additional amount, greatly reduce the cost of material；And due to the addition of boron, it is made to meet roll high intensity, the property of high-wearing feature
It can require；Low-carbon high-boron wear-resistant alloy roll preparation method is provided using the present invention simultaneously, it is thin by being carried out to face surface
Brilliant cure process improves the quality of rolling face, reduces the segregation of roll radial direction section, makes roll surface ingredient
Uniformly, performance is stablized.
Compared to the prior art, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, beneficial effect
It is:
One, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, using plasma arc, laser beam or
Electron beam technology is quickly scanned in Dual-metal roller set working face, is melted roll surface metal regional area in moment, then
It is quickly absorbed by cold conditions matrix, quickly solidification cooling, so that working face is generated fine grain sclerotic tissue, to improve roll surface working lining
Hardness and wearability.
Two, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, using roll sleeve type combined roll knot
Structure cancels integral quenching technique, only carries out hardening and fine grain treatment to body surface, and it is low to be heat-treated expense for simple process；Double gold
Belonging to roller set has the characteristics that interior tough and outer hard, meets the applying working condition of roll complexity, highly-safe.
Three, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, is taken in working layer using boron
In generation, the expensive alloying elements such as tungsten, molybdenum, vanadium, face surface in-situ preparation contained TiB in the prior art2The fine grain sclerotic tissue of phase,
The feature that intensity is high, wearability is good can be met, reduce production cost.
Four, low-carbon high-boron wear-resistant alloy roll provided by the invention and preparation method thereof, the fine grain hardening that working face is formed
Organized layer with a thickness of 0.1-1.5mm, the drafts for making roll wear amount work with roll is suitable, roll in use with
Rolled piece is contacted and is worn, and carries out turnery processing to roll after fine grain sclerotic tissue layer is all worn, and it is thin to re-start surface
It can be reused after brilliant cure process.Low-carbon high-boron wear-resistant alloy roll provided by the invention carries out reprocessing process to roll
In, loaded vehicle thickness is small, only Wear layer thickness, greatly improves loaded vehicle number, increases the access times of roll, and then improve
Total steel transportation amount of roll reduces the consumption of ton steel roll.
Embodiments of the present invention are explained in detail above, but the present invention is not limited to described embodiment.
To those skilled in the art, these embodiments are carried out without departing from the principles and spirit of the present invention more
Kind change, modification, replacement and modification are still fallen within protection scope of the present invention.
Claims (10)
1. a kind of preparation method of low-carbon high-boron wear-resistant alloy roll, which is characterized in that the roll includes roll shaft and is sheathed on
The Dual-metal roller set of the roll shaft, the Dual-metal roller set includes transition zone and working lining, and the working lining uses the high boron of low-carbon
The preparation method of antifriction alloy, the roll includes the following steps:
Step S1: mold is packed into after transition zone is surface-treated, and concentric with mold；
Step S2: melted low-carbon high-boron wear-resistant alloy is poured between mould inner wall and transition zone, and casting forms working lining,
And Dual-metal roller set is formed in conjunction with transition zone；
Step S3: Dual-metal roller set is made annealing treatment；
Step S4: the Dual-metal roller after annealing being covered and is assembled with roll shaft, and by design specification and rolled piece specification to bimetallic
Roller set outer circle is processed；
Step S5: fine grain cure process in surface is carried out to the working face of roll, its surface is made to form fine grain sclerotic tissue layer.
2. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 1, which is characterized in that the low-carbon is high
Boron wear-resistant alloy includes following ingredient by weight percentage:
C:0.05~0.3%；B:2.0~4.0%；Si:0.5~1.0%；Mn:0.3~1.0%；Cr:10~18%；Ni:0.2
~1.5%；Mo:0.5~1.5%；Ti:0.2~1.0%；W:0.1~1.0%；Surplus is Fe and inevitable impurity.
3. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 2, which is characterized in that
In step S2, pouring temperature is 1380-1500 DEG C；
In step S3, annealing process are as follows: annealing temperature is 870-950 DEG C, soaking time 4-6h.
4. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 1, which is characterized in that in step S5,
It is quickly scanned using the working face of plasma arc, laser beam or electron beam technology to roll, forms fine grain sclerotic tissue layer.
5. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 4, which is characterized in that plasma arc,
The power of laser beam or electronics beam scanning rolling face is 3000-4500W, and scanning linear velocity is 200-300mm/min.
6. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 2, which is characterized in that the roll work
The surface in situ for making face is generated containing TiB2The fine grain sclerotic tissue layer of phase, the fine grain sclerotic tissue layer are carbon, boron compound, master
It to include TiB2、Cr2B、CrB2、Fe2B、Cr7C3And B4C。
7. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 1, which is characterized in that the fine grain is hard
Change organized layer with a thickness of 0.1-1.5mm.
8. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 1, which is characterized in that in step S1,
Transition zone, which is carried out surface treatment, includes:
Transition zone removing surface is clean, and apply antioxidizing paint；
The transition zone for applying antioxidizing paint is preheated, preheating temperature is 300-800 DEG C.
9. the preparation method of low-carbon high-boron wear-resistant alloy roll according to claim 1 to 8, which is characterized in that
The surface of the Dual-metal roller set is machined with hole slot by rolled piece specification, and the working face of the roll is hole rooved face.
10. a kind of low-carbon high-boron wear-resistant alloy roll, which is characterized in that including roll shaft and the Dual-metal roller for being sheathed on the roll shaft
Set, the Dual-metal roller set includes transition zone and working lining, and the working lining uses low-carbon high-boron wear-resistant alloy, and surface is formed
There is fine grain sclerotic tissue layer.
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Cited By (1)
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| CN112620352A (en) * | 2020-11-30 | 2021-04-09 | 湖南三泰新材料股份有限公司 | High-chromium cast iron alloy composite roller |
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