CN108754068A - High pre- finish rolling high speed steel roll collar of line and preparation method thereof - Google Patents

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

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

Abstract

High pre- finish rolling high speed steel roll collar of line and preparation method thereof, belongs to casting technology field.Using electro-smelting, first add steel scrap in fusion process, carburant, molybdenum-iron, metallic cobalt, ferrotungsten, ferrochrome is added after molten steel is melting down, and liquid steel temperature in stove is risen to 1607-1625 DEG C, the metallic aluminium for accounting for steel quality score 0.8-0.9% in stove is added, after heat preservation 4-6 minutes, vanadium iron is added, vanadium iron addition accounts for the 8.2-8.5% of steel quality score in stove, then it is come out of the stove after liquid steel temperature being risen to 1631-1649 DEG C to ladle, molten steel is after heavy rare earth calsibar alloy and TiN processing, centrifugal casting is at collars, there is good mechanical property and high temperature red hardness after heat treatment, using effect is good on high line pre-finishing mill frame.

Description

High pre- finish rolling high speed steel roll collar of line and preparation method thereof
Technical field
The invention discloses a kind of high speed steel roll collar and preparation method thereof, more particularly to a kind of pre- finish rolling high speed steel rider of high line Ring and preparation method thereof belongs to casting technology field.
Background technology
The pre-finishing mill group of high-speed rod-rolling mill is from the differentiation differentiation of two intermediate mills, and effect is to continue with reduction The rolled piece section that thick intermediate mill is shut out, provides that the section configuration needed for mill product wire rod is correct, size is smart for mm finishing mill unit Middle material true and along overall length cross dimensions uniformly, without inherent and surface defect, to improve wire rod finished product accuracy and reduce essence Roll process failure.The important feature of contemporary high-speed rod-rolling mill be rolling high speed, the high quality of product, equipment it is efficient Rate.Therefore, while finish rolling equips fast-developing, pre-finishing mill group is also being continuously improved.The late 1980s, in order to Ensureing that finishing mill shuts out the finished product that dimensional accuracy is high, surface quality is good, pre-finishing mill group mostly uses that cantilever is flat/vertical to be alternately arranged, Rack construction is similar to finishing mill, and kink, driven separately are set between rack.After, to further increase semi-finished product precision, some height Fast rod-rolling mill uses 6 frame pre-finishing mills, and uses the carbon tungsten roller ring of high hardness wear-resisting material.
Chinese invention patent CN101994050 discloses a kind of steel rolling cord thread tungsten carbide roll collar recipe, including following component, Each component weight percent is:WC 90.5~92.5%, Co 3.5~4.5%, Ni 3.5~4.5%, TiC 0.2~ 0.5%, CrC 0.2~0.5%, VC 0.1~0.3%.The advantages of invention is:Improve the raw material composition of carbon tungsten roller ring And composition proportion, so that it is had and meet the internal condition that the internal organizational structure of performance needs is formed, applies in water quality PH value is alkaline, water temperature is less than under conditions of 32 DEG C of cooling waters, is greatly improved the amount of rolling of roll list slot single high-carbon steel, with The tungsten carbide roll that the same industry uses is compared, and the amount of rolling of collars can be improved one times or more.Chinese invention patent CN 101994051 also disclose a kind of tungsten carbide roll collar formula, can effectively solve the problem that existing carbon tungsten roller ring comprehensive performance is not high, roller The not high problem of the amount of rolling of ring.A kind of tungsten carbide roll collar formula, including following component, each component weight percent are:WC 93 ~98%, Co 1.5~5%, Ni 0~4%, TiC 0.2~0.3%, CrC 0.2~0.3%, VC 0.05~0.3%, Y 0.05~0.1%.The advantages of invention is:The raw material composition and composition proportion for improving tungsten carbide roll, make it have full The internal condition that the internal organizational structure that sufficient performance needs is formed, and collars wear extent is small, the smooth not broken roller in surface, uses Period is long, and roll change number is few, not only reduces roll change workload, reduces expenses, and improve operating rate of rolling mill and Product yield, it is ensured that the inherent quality and surface quality of produced wire product.Chinese invention patent CN105671402 is also public A kind of high line carbide roll ring is opened, it is made of the component of following weight percentage:Nickel powder 12-18%, cobalt powder 8- 12%, be carbonized vanadium powder 0.1-0.3%, and be carbonized chromium powder 0.2-0.6%, neodymium powder 0.8-1%, and surplus is spherical carbide tungsten powder, described The mean grain size of spherical carbide tungsten powder is 5-6um.The invention is a kind of roll collar of rolling mill for rolled steel, it can be solved The problem of existing hard alloy roll is also easy to produce crackle.Chinese invention patent CN 105568107 also discloses a kind of high line collars Manufacturing method, this approach includes the following steps:Dispensing is carried out by the component of following weight percentage:Nickel powder 12-18%, cobalt Powder 8-12%, be carbonized vanadium powder 0.1-0.3%, and be carbonized chromium powder 0.2-0.6%, neodymium powder 0.8-1%, and surplus is spherical carbide tungsten powder, The mean grain size of the spherical carbide tungsten powder is 5-6um;Each raw material of said ratio is put into absolute ethyl alcohol mixing, will be mixed Material is put into ball mill after grinding 10-14h, and the mixture that grinding obtains is put into mold and uses supersonic oscillations jolt ramming mixture Afterwards, it is pressed into green compact at 500-700MPa;Green compact is put into sintering furnace, is heated to 1400-1480 DEG C, 50-80 points of heat preservation Zhong Hou, cool to the furnace room temperature to get.The invention solves the problems, such as that the high line collars of existing hard alloy is also easy to produce crackle.In State patent of invention CN 106011605 also discloses a kind of carbide roll ring, including collars seat and carbide ring, the roller Ring seat is made of the raw material of following parts by weight:60 parts~70 parts of iron powder, 15 parts~26 parts of silica flour, 20 parts~30 parts of carbon dust, copper powder 6 Part~10 parts, 11 parts~17 parts of chromium powder, 9 parts~18 parts of nickel powder, 3 parts~7 parts of molybdenum powder, 6 parts~15 parts of deslagging agent, 2 parts of nodulizer ~6 parts;The carbide ring is made of the raw material of following parts by weight:50 parts~65 parts of tungsten carbide powder, 30 parts~42 parts of cobalt powder, 17 parts~28 parts of nickel powder, 25 parts~38 parts of carbonized titanium powder, 11 parts~20 parts of chromium powder.The collars seat passes through weldering with carbide ring It connects in succession.Compared with prior art, the collars seat of the invention and carbide ring adhesion strength are high.Chinese invention patent CN 106119679 and a kind of preparation method of carbide roll ring, including collars seat and carbide ring are disclosed, collars seat uses It is prepared by following raw material:Iron powder, silica flour, carbon dust, copper powder, chromium powder part, nickel powder, molybdenum powder, deslagging agent, nodulizer;Carbide ring is adopted It is prepared with following raw material:Tungsten carbide powder, cobalt powder, nickel powder, carbonized titanium powder, chromium powder;Including following preparation process:A. collars seat is pacified It is fixed on pedestal loaded on laser-beam welding machine;B., the carbide ring that diameter is more than to collars seat is sleeved on the outside of collars seat;C. root Pedestal is adjusted according to the position of the instruction point of laser beam so that the seam of hard alloy and collars seat is indicating at point;D. hard closes The seam crossing of Jin Huan and collars seat carries out laser welding;E. it is placed in temperature cycles case and recycles, obtain after circulation terminates.With it is existing There is technology to compare, which solves the problems, such as that adhesion strength is not high.
Carbon tungsten roller ring is although have excellent wearability, and manufacturing cost is too high, and carbon tungsten roller ring brittleness is big, makes With easy to crack in the process.In order to improve collars performance, Chinese invention patent CN1424423 discloses one kind and is rolled for all kinds of wire rods The high speed steel roll collar and its manufacturing method of machine and bar mill, chemical composition are (weight %):C:1.2~3.0;W:2.0~ 6.0;Mo:3.0~8.0;V:1.0~10.0;Cr:4.5~12.0;Al:0.4~1.5;N i:0.3~1.5;Co:0.5~ 10.0;Nb:0.5~5.0;Ti:0.1~1.0;Ce:0.05~0.30;Na:0.05~0.30;M g:0.005~0.025;Si < 1.5;Mn < 1.5;S < 0.05;P < 0.05;Remaining is Fe.Collars uses electro-smelting, centre spinning method molding to carry out Annealing, high temperature quenching and temper are twice.Its hardness is more than 65HRC, and 600 DEG C of red hardness are more than 60H RC, tensile strength 900 ~1050Mpa.Chinese invention patent CN 101596553 also discloses a kind of high speed steel roll collar applied to high-speed rod-rolling mill And its manufacturing method, chemical composition are (mass fraction, %):3.0~3.5C, 5.0~7.0V, 4.2~4.5Cr, 9.0 ~10.0Mo, 5.5~8.0Co, 0.4~1.0Al, 1.5~4.0Nb, 0.10~0.25Ti, 0.003~0.006B, 0.08~ 0.25RE, 0.06~0.12Zr, < 0.8Si ,≤1.0Mn, remaining is iron and inevitable trace impurity.The invention collars passes through After melting, Metamorphism treatment, in centrifugal casting machine upper.Collars carries out roughing after annealing, is carried out after quenched and tempering Finishing has the characteristics that hardness is high, red hardness is good, is used on high-speed rod-rolling mill, have excellent wearability.Middle promulgated by the State Council Bright patent CN102766824 also discloses a kind of wear-resistant high speed steel collars and preparation method thereof, belongs to high speed steel roll collar technology neck Domain.Its chemical composition is mass fraction %:2.6~3.2C, 14.5~15.0W, 2.5~3.0Mo, 1.5~2.0V, 4.0~ 4.5Cr, 4.5~5.0Co, 6.2~6.8Nb, 0.5~0.8Ni, 0.15~0.20B, 0.25~0.40Al, 0.07~0.10Y, 0.04~0.06Ti, 0.08~0.12N, 0.04~0.07Ca, 0.020~0.035Zr, 0.08~0.11Mg, 0.12~ 0.15Zn, 0.5~1.2Si, 0.20~0.45Mn, S≤0.02, P≤0.03, remaining is Fe.Using centrifugal casting.Collars is hard Degree is high, wearability is good.
Chinese invention patent CN103757547 also discloses a kind of composite roll collar cast steel material, the change contained It learns elemental composition and its mass percent is:Carbon 0.8-0.9, tungsten 1.2-1.5, molybdenum 1.5-2.5, vanadium 1.5-2.5, chromium 2.2-2.5, Niobium 0.05-0.10, rare earth 0.1, Mg0.004-0.007, Al0.02-0.05, P≤0.030, S≤0.030, surplus are iron.The hair It is bright and to pass through double refining by adding rare earth, Al, a variety of alloying elements such as niobium on the basis of high-carbon steel, rationally control casting Heat treatment temperature afterwards, in batches throwing raw materials so that steel alloy has the characteristic of high-speed steel, compared with high temperature resistant, red hard higher, rigidity and Toughness is worked good, wearability is good, and hardness height, impact resistance, the collars of the roll suitable for wire rod machine, cost is relatively low, prolonged resistance to With.The invention uses part scrap iron as raw material, makes alloy quality stable uniform.Chinese invention patent CN105420629 is also public The high-ductility hard material collars and manufacturing method suitable for high-speed wire rolling, the chemical composition by weight hundred of the material are opened Point ratio is:C:4~5.5%, Re:0.04~0.1%, W:6~18%, Mo:3~5%, Cr:4~6%, Ni:0.5~2%, V: 6~8%, S≤0.035%, P≤0.035%, remaining is Fe.Its manufacturing method uses electric furnace smelting, centrifugal casting, nodularization to move back Fire+quenching+heat treatment process being repeatedly tempered.The innovation point of this kind of high-ductility hard material collars focuses primarily upon material Two aspects of innovation and process innovation, have superior abrasion resistance, have and coordinate compared with high-strength tenacity.It is mainly used for replacing the current country Widely used plain cast iron collars and WC collars in metallurgical industry steel rolling field extend the service life period of collars, improve The operating rate of high-speed rod-rolling mill.
But the various common antifriction alloy collars developed at present, compared with carbon tungsten roller ring, generally existing high-temperature stable It is insufficient that property difference and high temperature abrasion resistance are low etc..
Invention content
In order to overcome the deficiencies of the prior art, in high-speed steel, aluminium is added, cobalt element improves matrix high-temperature stable in the present invention Property, and during centrifugal casting, the V of high rigidity is added0.2Nb0.8C powder.
The preparation process of the high pre- finish rolling high speed steel roll collar of line, using electro-smelting, specific step of preparation process includes as follows:
1. carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening are first used, it is molten using electric furnace It refines, steel scrap, carburant, molybdenum-iron, metallic cobalt, ferrotungsten is first added in fusion process, ferrochrome is added after molten steel is melting down, by molten steel in stove Chemical composition and its mass fraction control are in 2.53-2.79%C, 5.14-5.47%Co, 15.67-15.81%Mo, 1.03- 1.40%W, 5.51-5.85%Cr,<0.60%Si,<0.50%Mn,<0.035%P,<0.032%S, surplus Fe, and will be in stove Liquid steel temperature rises to 1607-1625 DEG C, and the metallic aluminium for accounting for steel quality score 0.8-0.9% in stove is added, and keeps the temperature 4-6 minutes Afterwards, it is added and preheats 100-120 minutes, the vanadium iron of particle size 15-22mm × 15-22mm × 15-22mm, vanadium through 750-800 DEG C Iron addition accounts for the 8.2-8.5% of steel quality score in stove, is come out of the stove after liquid steel temperature is then risen to 1631-1649 DEG C to steel It wraps, the heavy rare earth calsibar alloy and 200-250 purposes of particle size 3-6mm × 3-6mm × 3-6mm has been previously added in ladle TiN particles, heavy rare earth calsibar alloy and TiN particle loads account for the 0.35- into steel quality score in ladle respectively 0.40% and 0.25-0.30%;
2. 1. the molten steel in ladle, when temperature is down to 1477-1495 DEG C, molten steel is poured into step after skimming, standing In casting mold on high-speed rotating centrifugal casting machine, and during pouring molten steel, 120-160 purposes are poured into steel flow V0.2Nb0.8C powder, V0.2Nb0.8C powder additions account for the 3.8-4.0% into steel quality score in casting mold, molten steel solidification Afterwards, centrifuge is shut down, takes out casting and obtain high speed steel roll collar blank, high speed steel roll collar blank is after sand removal and polishing, directly Carry out roughing;
3. by the good high speed steel roll collar of roughing with stove heat to 1065-1080 DEG C, 2-3 hours are kept the temperature, is then sprayed cold But it, and by high speed steel roll collar cooling velocity controls at 28-32 DEG C/min, when roll surface temperature is down to 400-460 DEG C, immediately will High speed steel roll collar enters stove heat to 540-570 DEG C, after heat preservation 3-4 hour, comes out of the stove and be air-cooled to roll surface temperature when being 320-360 DEG C, Continue high speed steel roll collar with stove heat to 550-565 DEG C, after keeping the temperature 5-6 hours, is furnace-cooled to temperature and is less than 150 DEG C, sky of coming out of the stove It is cooled to room temperature, is finally refined to predetermined size and precision, you can obtains the pre- finish rolling high speed steel roll collar of high line.
The chemical composition and its mass fraction of heavy rare earth calsibar alloy as described above are 8.24-8.71%Y, 28.16- 30.09%Si, 8.91-9.45%Ca, 9.62-9.90%Ba ,≤0.8%C ,≤0.04%P ,≤0.06%S, surplus Fe.
The chemical composition and its mass fraction of vanadium iron as described above are 78.41-81.73%V ,≤0.30%C ,≤1.50% Si ,≤0.08%P ,≤0.06%S ,≤2.0%Al ,≤0.50%Mn, surplus Fe.
The high pre- finish rolling high speed steel roll collar of line of the present invention uses electro-smelting, and smelting process is simple, and Composition Control precision is high.It adopts With carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening, furnace charge convenient sources, all in state Interior buying.In order to improve molten steel efficiency, in electro-smelting molten steel, in fusion process first plus steel scrap, carburant, molybdenum-iron, Metallic cobalt, ferrotungsten, it is possible to reduce the scaling loss of alloying element.It is chromium in order to prevent in addition, ferrochrome is added after molten steel is melting down Oxidization burning loss.The chemical composition of molten steel in stove and its mass fraction are controlled in 2.53-2.79%C, 5.14-5.47%Co, 15.67-15.81%Mo, 1.03-1.40%W, 5.51-5.85%Cr,<0.60%Si,<0.50%Mn,<0.035%P,< 0.032%S, surplus Fe.Important feature of the present invention is that 2.53-2.79%C is added, it is therefore an objective to which carbon is combined generation high with alloying element The alloy carbide of hardness, for improving high speed steel roll collar wearability.In addition, 15.67-15.81%Mo is added, mainly improve The high temperature red hardness of collars, a large amount of additions of molybdenum, can also improve the uniformity of distribution of carbides, be conducive to improve high speed steel rider The obdurability of ring.Wolfram element density is high, excessive to be added in high speed steel roll collar, easily occurs in centrifugal casting process serious inclined Analysis reduces collars comprehensive performance.5.51-5.85%Cr is added, other than improving the high temperature oxidation resistance of high speed steel roll collar, contains chromium Carbide is soluble in high temperature quenching process to enter matrix, and M is easily precipitated in drawing process23C6Type carbide is conducive to carry High matrix microhardness, to improve high speed steel roll collar wearability.
Cobalt and aluminium are non-carbide formers, are mainly solid-solution in matrix, can increase substantially matrix high temperature hardness, from And it is obviously improved the high temperature abrasion resistance of high speed steel roll collar.But aluminium element is added in molten steel and easily aoxidizes, control is bad, can band Carry out many field trashes, damages the mechanical property of high-speed steel instead, especially will be greatly reduced the intensity and toughness of high-speed steel.In order to Overcome and the adverse effect that aluminium element is brought is added, the present invention rises to 1607-1625 in the smelting molten steel later stage, by liquid steel temperature in stove DEG C, the metallic aluminium for accounting for steel quality score 0.8-0.9% in stove is added, after keeping the temperature 4-6 minutes, is added and is preheated through 750-800 DEG C 100-120 minutes, the vanadium iron of particle size 15-22mm × 15-22mm × 15-22mm, vanadium iron addition account for steel quality in stove The 8.2-8.5% of score.It may insure that vanadium iron quickly fuses into molten steel in this way, hence it is evident that mitigate the scaling loss of v element.Then by steel Coolant-temperature gage is come out of the stove after rising to 1631-1649 DEG C to ladle, and particle size 3-6mm × 3-6mm × 3-6mm has been previously added in ladle Heavy rare earth calsibar alloy and 200-250 mesh TiN particles, heavy rare earth calsibar alloy and TiN particle loads account for respectively The 0.35-0.40% and 0.25-0.30% of steel quality score in into ladle.The weight of mass fraction 0.35-0.40% is added Rare earth silicon-calcium barium alloy, and the chemical composition of heavy rare earth calsibar alloy and its mass fraction control are existed:8.24-8.71%Y, 28.16-30.09%Si, 8.91-9.45%Ca, 9.62-9.90%Ba ,≤0.8%C ,≤0.04%P ,≤0.06S, surplus are Fe.The wherein addition of heavy rare earth Y can be conducive to thinning solidification structure with deoxidation, desulfurization, to improving the form of carbide and dividing It is furnished with good effect.And the addition of Ca, to improving the form of steel inclusion and good effect being distributed with.The addition of Ba has Good deoxidization desulfuration effect promotes floating of the field trash in molten steel, also good degassing effect.Titanium nitride (TiN) has There is typical NaCl types structure, belongs to face-centered cubic lattice, lattice constant a=0.4241nm, wherein titanium atom are located at face-centered cubic Angle top.TiN is non-stoichiometric compound, and the compositing range stablized is TiN0.37-TiN1.16, and the content of nitrogen can be The variation changed without causing TiN structures in certain range, TiN fusing points are high, reach 2950 DEG C.It is added and is accounted for into steel in molten steel The TiN of steel quality score 0.25-0.30% in packet can promote refinement and the carbide of high speed steel roll collar solidified structure Suspension and isolated distribution, to increase substantially the intensity and toughness of high speed steel roll collar.In addition, TiN hardness is high, into matrix Collars wearability can also be improved.
Molten steel in ladle is after skimming, standing, and when temperature is down to 1477-1495 DEG C, molten steel is poured into high speed rotation Centrifugal casting machine on casting mold in.Collars is produced using centre spinning method, collars microscopic structure is fine and close, and production efficiency It is high.But during centrifugal casting production high speed steel roll collar, due to the effect of centrifugal force, low density element and carbide, meeting It is segregated in collars internal layer, and the high element and carbide of density can be segregated in collars outer surface, keep collars performance uneven.In order to High speed steel roll collar wearability is further increased, the present invention has been poured into steel flow and accounted for into casting mold during pouring molten steel The V of the 120-160 mesh of steel quality score 3.8-4.0%0.2Nb0.8C powder, V0.2Nb0.8C density is close with molten steel density, Be not in segregation in centrifugal casting process, promote increasing substantially for high speed steel roll collar comprehensive performance.It, will after molten steel solidification Centrifuge is shut down, and is taken out casting and is obtained high speed steel roll collar blank, high speed steel roll collar blank directly carries out thick after sand removal and polishing Processing.
The present invention by the good high speed steel roll collar of roughing with stove heat to 1065-1080 DEG C, keep the temperature 2-3 hours, realized Full austenite, then misting cooling, and high speed steel roll collar cooling velocity is controlled at 28-32 DEG C/min, it is ensured that high speed steel rider Do not occur the pearlite matrix of soft in the quenching structure of ring.When roll surface temperature is down to 400-460 DEG C, immediately by high-speed steel Collars enters stove heat to 540-570 DEG C, after keeping the temperature 3-4 hours, comes out of the stove air-cooled, it is ensured that the retained austenite in quenching structure is complete Portion is converted into martensite and bainite, prevents cracking during high speed steel roll collar use.When collars roll surface temperature is 320- At 360 DEG C, continue high speed steel roll collar with stove heat to 550-565 DEG C, after keeping the temperature 5-6 hours, is furnace-cooled to temperature and is less than 150 DEG C, it comes out of the stove and is air-cooled to room temperature, mainly eliminate collars internal stress, stabilizing tissue prevents from cracking in collars use.Finally finish To predetermined size and precision, you can obtain the pre- finish rolling high speed steel roll collar of the high line haveing excellent performance.
Compared with prior art, the present invention haing the following advantages:
1) collars hardness of the present invention is high, reaches 88-91HSD, has excellent wearability;
2) collars red hardness of the present invention is good, reaches 80-83HSD in 600 DEG C of red hardness;
3) collars of the present invention has excellent wearability, is used in high-speed rod-rolling mill pre-finishing mill group, roller of the present invention The service life of ring improves 600% or more than high Minvar collars, and suitable with carbide roll ring, production cost only has hard The 40-43% of alloy collars, promoting and applying collars of the present invention has good economic and social benefit.
Specific implementation mode
The present invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.
Embodiment 1:
The high pre- finish rolling high speed steel roll collar of line uses 1000 kilograms of medium-frequency induction furnace meltings, and specific step of preparation process is such as Under:
1. carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening are first used, using 1000 public affairs Jin medium-frequency induction furnace melting in fusion process first plus steel scrap, carburant, molybdenum-iron, metallic cobalt, ferrotungsten is added after molten steel is melting down Ferrochrome, by the chemical composition of molten steel in stove and its mass fraction control in 2.53%C, 5.47%Co, 15.67%Mo, 1.40% W, 5.51%Cr, 0.53%Si, 0.39%Mn, 0.033%P, 0.026%S, surplus Fe, and liquid steel temperature in stove is risen to 1607 DEG C, the metallic aluminium for accounting for steel quality score 0.8% in stove is added, after keeping the temperature 6 minutes, is added and preheats 120 points through 750 DEG C The vanadium iron of clock, particle size 15-22mm × 15-22mm × 15-22mm, the chemical composition and its mass fraction of vanadium iron are 78.41%V, 0.21%C, 1.25%Si, 0.061%P, 0.039%S, 1.26%Al, 0.22%Mn, surplus Fe, vanadium iron add Enter amount accounts for steel quality score in stove 8.5%, then liquid steel temperature is risen to after 1631 DEG C and is come out of the stove to ladle, in ladle in advance The heavy rare earth calsibar alloy of particle size 3-6mm × 3-6mm × 3-6mm and the TiN particles of 200-250 mesh are added, weight is dilute The chemical composition and its mass fraction of native calsibar alloy be 8.24%Y, 30.09%Si, 8.91%Ca, 9.90%Ba, 0.47%C, 0.035%P, 0.051%S, surplus Fe;Heavy rare earth calsibar alloy and TiN particle loads account for entrance respectively The 0.40% and 0.25% of steel quality score in ladle;
2. 1. the molten steel in ladle is after skimming, standing for step, when temperature is down to 1477 DEG C, molten steel is poured into high speed and is revolved In the casting mold on centrifugal casting machine turned, and during pouring molten steel, the V of 120-160 mesh is poured into steel flow0.2Nb0.8C powder End, V0.2Nb0.8C powder additions account for 3.8% into steel quality score in casting mold, and after molten steel solidification, centrifuge is shut down, It takes out casting and obtains high speed steel roll collar blank, high speed steel roll collar blank directly carries out roughing after sand removal and polishing;
3. by the good high speed steel roll collar of roughing with stove heat to 1070 DEG C, 2.5 hours are kept the temperature, then misting cooling, and High speed steel roll collar cooling velocity is controlled at 29-31 DEG C/min, when roll surface temperature is down to 420-450 DEG C, immediately by high-speed steel Collars enters stove heat to 560 DEG C, after heat preservation 3.5 hours, comes out of the stove and be air-cooled to roll surface temperature when being 330-345 DEG C, continuing will high speed Steel rider ring, to 560 DEG C, after keeping the temperature 5.5 hours, is furnace-cooled to temperature and is less than 150 DEG C, come out of the stove and be air-cooled to room temperature with stove heat, last essence It is machined to predetermined size and precision, you can obtain the pre- finish rolling high speed steel roll collar of high line, high speed steel roll collar mechanical property is shown in Table 1.
Embodiment 2:
The high pre- finish rolling high speed steel roll collar of line uses 500 kilograms of medium-frequency induction furnace meltings, specific step of preparation process as follows:
1. carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening are first used, using 500 public affairs Jin medium-frequency induction furnace melting in fusion process first plus steel scrap, carburant, molybdenum-iron, metallic cobalt, ferrotungsten is added after molten steel is melting down Ferrochrome, by the chemical composition of molten steel in stove and its mass fraction control in 2.79%C, 5.14%Co, 15.81%Mo, 1.03% W, 5.85%Cr, 0.49%Si, 0.43%Mn, 0.030%P, 0.031%S, surplus Fe, and liquid steel temperature in stove is risen to 1625 DEG C, the metallic aluminium for accounting for steel quality score 0.9% in stove is added, after keeping the temperature 4 minutes, is added and preheats 100 points through 800 DEG C The vanadium iron of clock, particle size 15-22mm × 15-22mm × 15-22mm, the chemical composition and its mass fraction of vanadium iron are 81.73%V, 0.26%C, 0.97%Si, 0.067%P, 0.045%S, 1.29%Al, 0.41%Mn, surplus Fe, vanadium iron add Enter amount accounts for steel quality score in stove 8.2%, then liquid steel temperature is risen to after 1649 DEG C and is come out of the stove to ladle, in ladle in advance The heavy rare earth calsibar alloy of particle size 3-6mm × 3-6mm × 3-6mm and the TiN particles of 200-250 mesh are added, weight is dilute The chemical composition and its mass fraction of native calsibar alloy be 8.71%Y, 28.16%Si, 9.45%Ca, 9.62%Ba, 0.60%C, 0.027%P, 0.051%S, surplus Fe;Heavy rare earth calsibar alloy and TiN particle loads account for entrance respectively The 0.35% and 0.30% of steel quality score in ladle;
2. 1. the molten steel in ladle is after skimming, standing for step, when temperature is down to 1495 DEG C, molten steel is poured into high speed and is revolved In the casting mold on centrifugal casting machine turned, and during pouring molten steel, the V of 120-160 mesh is poured into steel flow0.2Nb0.8C powder End, V0.2Nb0.8C powder additions account for 4.0% into steel quality score in casting mold, and after molten steel solidification, centrifuge is shut down, It takes out casting and obtains high speed steel roll collar blank, high speed steel roll collar blank directly carries out roughing after sand removal and polishing;
3. by the good high speed steel roll collar of roughing with stove heat to 1065 DEG C, 3 hours are kept the temperature, then misting cooling, and will High speed steel roll collar cooling velocity is controlled at 30-32 DEG C/min, when roll surface temperature is down to 430-460 DEG C, immediately by high speed steel rider Ring enters stove heat to 540 DEG C, after heat preservation 4 hours, comes out of the stove and is air-cooled to roll surface temperature when being 330-360 DEG C, continue high speed steel rider Ring, to 550 DEG C, after keeping the temperature 6 hours, is furnace-cooled to temperature and is less than 150 DEG C, come out of the stove and be air-cooled to room temperature, be finally refined to stove heat Predetermined size and precision, you can obtain the pre- finish rolling high speed steel roll collar of high line, high speed steel roll collar mechanical property is shown in Table 1.
Embodiment 3:
The high pre- finish rolling high speed steel roll collar of line uses 1500 kilograms of medium-frequency induction furnace meltings, and specific step of preparation process is such as Under:
1. carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening are first used, using 1500 public affairs Jin medium-frequency induction furnace melting in fusion process first plus steel scrap, carburant, molybdenum-iron, metallic cobalt, ferrotungsten is added after molten steel is melting down Ferrochrome, by the chemical composition of molten steel in stove and its mass fraction control in 2.64%C, 5.31%Co, 15.74%Mo, 1.28% W, 5.75%Cr, 0.59%Si, 0.44%Mn, 0.032%P, 0.029%S, surplus Fe, and liquid steel temperature in stove is risen to 1614 DEG C, the metallic aluminium for accounting for steel quality score 0.85% in stove is added, heat preservation after five minutes, is added and preheats 110 points through 780 DEG C The vanadium iron of clock, particle size 15-22mm × 15-22mm × 15-22mm, the chemical composition and its mass fraction of vanadium iron are 80.13%V, 0.25%C, 1.06%Si, 0.053%P, 0.048%S, 1.28%Al, 0.34%Mn, surplus Fe, vanadium iron add Enter amount accounts for steel quality score in stove 8.4%, then liquid steel temperature is risen to after 1642 DEG C and is come out of the stove to ladle, in ladle in advance The heavy rare earth calsibar alloy of particle size 3-6mm × 3-6mm × 3-6mm and the TiN particles of 200-250 mesh are added, weight is dilute The chemical composition and its mass fraction of native calsibar alloy be 8.50%Y, 29.37%Si, 9.19%Ca, 9.83%Ba, 0.66%C, 0.029%P, 0.048%S, surplus Fe;Heavy rare earth calsibar alloy and TiN particle loads account for entrance respectively The 0.38% and 0.27% of steel quality score in ladle;
2. 1. the molten steel in ladle is after skimming, standing for step, when temperature is down to 1486 DEG C, molten steel is poured into high speed and is revolved In the casting mold on centrifugal casting machine turned, and during pouring molten steel, the V of 120-160 mesh is poured into steel flow0.2Nb0.8C powder End, V0.2Nb0.8C powder additions account for 3.9% into steel quality score in casting mold, and after molten steel solidification, centrifuge is shut down, It takes out casting and obtains high speed steel roll collar blank, high speed steel roll collar blank directly carries out roughing after sand removal and polishing;
3. by the good high speed steel roll collar of roughing with stove heat to 1080 DEG C, 2 hours are kept the temperature, then misting cooling, and will High speed steel roll collar cooling velocity is controlled at 28-30 DEG C/min, when roll surface temperature is down to 400-430 DEG C, immediately by high speed steel rider Ring enters stove heat to 570 DEG C, after heat preservation 3 hours, comes out of the stove and is air-cooled to roll surface temperature when being 320-340 DEG C, continue high speed steel rider Ring, to 565 DEG C, after keeping the temperature 5 hours, is furnace-cooled to temperature and is less than 150 DEG C, come out of the stove and be air-cooled to room temperature, be finally refined to stove heat Predetermined size and precision, you can obtain the pre- finish rolling high speed steel roll collar of high line, high speed steel roll collar mechanical property is shown in Table 1.
1 high speed steel roll collar mechanical property of table
Collars hardness of the present invention is high, reaches 88-91HSD, collars red hardness of the present invention is good, reaches in 600 DEG C of red hardness 80-83HSD.In addition, collars intensity of the present invention is high, good toughness uses, roller of the present invention in high-speed rod-rolling mill pre-finishing mill group The service life of ring improves 600% or more than high Minvar collars, and suitable with carbide roll ring, production cost only has hard The 40-43% of alloy collars.Collars of the present invention overcomes deficiency that is easy to crack in carbide roll ring use and peeling off.Popularization is answered With collars of the present invention, collars consumption and collars procurement payment can be reduced, improves operating rate of rolling mill, it is strong to mitigate worker's labour Degree has good economic and social benefit.

Claims (4)

1. a kind of preparation method of the pre- finish rolling high speed steel roll collar of high line, which is characterized in that use electro-smelting, specific preparation process Step includes as follows:
1. carburant, metallic cobalt, molybdenum-iron, ferrotungsten, ferrochrome, vanadium iron, steel scrap and metallic aluminium furnace burdening are first used, using electro-smelting, First add steel scrap, carburant, molybdenum-iron, metallic cobalt, ferrotungsten in fusion process, ferrochrome is added after molten steel is melting down, by the change of molten steel in stove Composition and its mass fraction control are learned in 2.53-2.79%C, 5.14-5.47%Co, 15.67-15.81%Mo, 1.03- 1.40%W, 5.51-5.85%Cr,<0.60%Si,<0.50%Mn,<0.035%P,<0.032%S, surplus Fe, and will be in stove Liquid steel temperature rises to 1607-1625 DEG C, and the metallic aluminium for accounting for steel quality score 0.8-0.9% in stove is added, and keeps the temperature 4-6 minutes Afterwards, it is added and preheats 100-120 minutes, the vanadium iron of particle size 15-22mm × 15-22mm × 15-22mm, vanadium through 750-800 DEG C Iron addition accounts for the 8.2-8.5% of steel quality score in stove, is come out of the stove after liquid steel temperature is then risen to 1631-1649 DEG C to steel It wraps, the heavy rare earth calsibar alloy and 200-250 purposes of particle size 3-6mm × 3-6mm × 3-6mm has been previously added in ladle TiN particles, heavy rare earth calsibar alloy and TiN particle loads account for the 0.35- into steel quality score in ladle respectively 0.40% and 0.25-0.30%;
2. 1. the molten steel in ladle is after skimming, standing for step, when temperature is down to 1477-1495 DEG C, molten steel is poured into high speed In casting mold on the centrifugal casting machine of rotation, and during pouring molten steel, the V of 120-160 mesh is poured into steel flow0.2Nb0.8C Powder, V0.2Nb0.8C powder additions account for the 3.8-4.0% into steel quality score in casting mold, after molten steel solidification, will centrifuge Machine is shut down, and taking-up casting obtains high speed steel roll collar blank, and high speed steel roll collar blank directly carries out slightly adding after sand removal and polishing Work;
3. by the good high speed steel roll collar of roughing with stove heat to 1065-1080 DEG C, 2-3 hours are kept the temperature, then misting cooling, and High speed steel roll collar cooling velocity is controlled at 28-32 DEG C/min, when roll surface temperature is down to 400-460 DEG C, immediately by high-speed steel Collars enters stove heat to 540-570 DEG C, after heat preservation 3-4 hour, comes out of the stove and is air-cooled to roll surface temperature when being 320-360 DEG C, continue by High speed steel roll collar, to 550-565 DEG C, after keeping the temperature 5-6 hours, is furnace-cooled to temperature and is less than 150 DEG C, come out of the stove and be air-cooled to room with stove heat Temperature is finally refined to predetermined size and precision, you can obtains the pre- finish rolling high speed steel roll collar of high line.
2. a kind of preparation method of high pre- finish rolling high speed steel roll collar of line described in accordance with the claim 1, which is characterized in that described heavy The chemical composition and its mass fraction of rare earth silicon-calcium barium alloy are 8.24-8.71%Y, 28.16-30.09%Si, 8.91- 9.45%Ca, 9.62-9.90%Ba ,≤0.8%C ,≤0.04%P ,≤0.06%S, surplus Fe.
3. a kind of preparation method of high pre- finish rolling high speed steel roll collar of line described in accordance with the claim 1, which is characterized in that the vanadium The chemical composition and its mass fraction of iron be 78.41-81.73%V ,≤0.30%C ,≤1.50%Si ,≤0.08%P ,≤ 0.06%S ,≤2.0%Al ,≤0.50%Mn, surplus Fe.
4. the pre- finish rolling high speed steel roll collar of high line being prepared according to claim 1-3 any one of them methods.
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