CN105755379A - Wear-resistant high-speed steel roll collar for kocks rolling mills and manufacturing method of wear-resistant steel roll collar - Google Patents

Wear-resistant high-speed steel roll collar for kocks rolling mills and manufacturing method of wear-resistant steel roll collar Download PDF

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CN105755379A
CN105755379A CN201610133574.5A CN201610133574A CN105755379A CN 105755379 A CN105755379 A CN 105755379A CN 201610133574 A CN201610133574 A CN 201610133574A CN 105755379 A CN105755379 A CN 105755379A
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steel
stove
temperature
speed
casting mold
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CN105755379B (en
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张政龙
左兴平
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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
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02Shape or construction of rolls
    • B21B27/024Rolls for bars, rods, rounds, tubes, wire or the like
    • B21B27/025Skew rolls
    • 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
    • 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
    • B22D13/10Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101Moulds
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • C22C38/02Ferrous 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
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

The invention discloses a wear-resistant high-speed steel roll collar for kocks rolling mills and a manufacturing method of the wear-resistant high-speed steel roll collar, and belongs to the technical field of steel rolling.According to the manufacturing method, a high-speed steel material is smelted in an electric induction furnace by a centrifugal casting process; once molten steel in the furnace reaches the temperature of 1620-1650 DEG C and comprises, by mass, 1.8-2.5% of C, 3.9-5.0% of V, 4.5-4.9% of Mo, 5.1-5.5% of W, 4.8-5.2% of Cr, 0.04-0.09% of N, 0.03-0.06% of Al, 0.02-0.05% of Ca, 0.04-0.08% of Ba, 0.5-0.9% of Si, <0.6% of Mn, <0.035% of S, <0.040% of P, and the balance being Fe, the molten steel is discharged into steel ladles from the furnace; during discharging of the molten steel, compound inoculation modificators are added in the molten steel flow; once the temperature of the molten steel is reduced to 1440-1480 DEG C, the molten steel is poured in casts which are in high-speed rotation on a centrifuge and is subjected to annealing, rough finishing and quenching, and finally a product is obtained by tempering.

Description

Wear-resistant high speed steel collars for kocks milling train and preparation method thereof
Technical field
The invention discloses a kind of rolling mill collars and preparation method thereof, particularly to one for kocks milling train Wear-resistant high speed steel collars and preparation method thereof, belong to technical field of steel rolling.
Background technology
Rod, volume, line are one of kinds common in metallurgic product.Kocks milling train can not only be used for the end of rod, volume Milling train, it is possible to as the middle embryo milling train of high line.With the production procedure of Kocks milling train it is: steel embryo heats, and enters Entering tandem mill thermal processing distortion, enter back into Kocks milling train, Direct Rolling finished product is excellent, if bulk lots volume, Kocks, by entering crimping machine after product roll forming, is curled into and coils.If wire rod, Kocks milling train is High-speed wire mill provides middle stock, high-speed wire mill roll out finished product.Kocks milling train is three-high mill, total 4 rolling mills, each rolling mill has 3 power transmission shafts, and each rolling mill is arranged in " C module ", " C module " It is similar to the memorial archway of duo mill.From former design, Kocks has 4 rolling mills, and rolling maximum specification is Φ50mm.When Kocks milling train normally puts into production, there are two kinds of combining forms according to its rolling specs difference: (1), 4 rolling mill entirety use;(2), 3 rolling mills and 1 were maked somebody a mere figurehead milling train and were applied in combination.Kocks milling train is in dismounting Time, there is a set of special roll change buggy, by 4 rolling mill integral installation or dismountings.
Existing three-high mill is due to the design feature that its collars is that 120 ° of Y type is arranged, at rolled bar material, line Material, tubing and their difficult deformable metal show its outstanding advantages: (1) it be three-dimensional compression, if alternately Roll in six to compression, they alternate compression rolled pieces, therefore deform and cool down more uniform.(2) significantly subtract Few, windrow accident is also few.(3) use triangle pass schedule to belong to " similar shape pass " each road in three-high mill not change very much Becoming shape of rolling piece, therefore, pass collocation is uniform, and in tandem rolling, rolled piece section tension force everywhere is the most more uniform;Three rollings The finished product accuracy that machine shuts out is high, and its dimensional tolerance is up to ± 0.1mm.
The above-mentioned advantage of three-high mill, ought to promote this type of milling train, but, due to its design feature, limit again It is widely used;(1) three collars of three-high mill use nonadjustable structure.Although comparatively speaking, Structure is relatively simple, easily fabricates, and cost is the lowest, but, owing to collars can not adjust, after collars is installed, Various errors and elastic deformation cannot make up, and accumulated error and collars cannot be remedied after rolling a period of time abrasion, Both affect workpiece measurement precision, added again roll change number of times, overlap frame with greater need for standby more.(2) if using roller Ring adjustable mill with three roller, although overcome above-mentioned nonadjustable weakness, but, owing to collars adjustable is brought Three-high mill is extremely complex.Its processing and manufacturing difficulty is high, and cost is the highest, safeguards also difficulty.Therefore, above-mentioned Shortcoming the most significantly limits the development of milling train and is widely used.Therefore, develop high-performance abrasion-proof collars, be Kocks The difficult problem that milling train development is urgently to be resolved hurrily with popularization and application.
The preferable collars of wearability is mainly rich chromium cast iron collars, ni-hard cast iron collars and high speed steel roll collar at present, And high speed steel roll collar compares first two collars, because of the MC type carbide containing more high rigidity, have preferably Wearability.In order to improve the performance of high speed steel roll collar, Chinese invention patent CN 103276313 discloses one High speed steel roll collar and heat treatment method, each elemental composition is by weight percentage: C:1.3-1.9, B:0.4-0.8, Cr:3.0-5.0, Si:0.5-0.9, Mn:0.6-1.3, V:2.0-10.0, Ni:0.5-1.5, Mo:1.0-4.0, Nb:0.1-2.0, Co:4.5-5.0, Al:0.3-0.4, Ti:0.02-0.04, Zr:0.05-0.2, S < 0.04, P < 0.04, remaining is Fe.This invention is greatly improved Wear Resistance, heat resistance, thermal-shock resistance, and minimizing is rolled Heat fatigue cracking phenomenon that roller in use occurs and consequent lose flesh, burst apart, embodies good Security and wearability.Chinese invention patent CN 103008668 also discloses a kind of high-speed steel and is combined leveling rolling The manufacture method of roller, comprises the steps: 1) prepared by High Speed Steel Powders;2) High Speed Steel Powders is heat-treated;3) roller Core material and surface texture;4) spray of high-speed steel roller shell is swaged into shape, synchronizes recrystallization and synchronizing ultrasound forging Make;5) compound smooth roll is heat-treated.This invention uses atomization technique to prepare High Speed Steel Powders, to high-speed steel Powder is heat-treated and reduces its hardness, the oxygen of the introducing during powder reducing process, and roller core uses forged steel material and carries out Surface texture, high speed steel roll collar set uses spray to be swaged into shape, uses electromagnetic heating technique to carry out synchronizing simultaneously again Cerium sulphate crystal, and carry out synchronizing ultrasound forging raising dense structure's property.Last thermally treated acquisition is combined leveling rolling Roller.Collars set is tightly combined with roller core, and high-speed steel layer tissue crystal grain is tiny, and hardness is high, and serviceability is good, system Making technology stability high, strong adaptability, operation is reliable.Chinese invention patent CN 104018096 also public affairs Having opened a kind of high speed steel roll collar and preparation method thereof, high speed steel roll collar component (wt%) is C2.2~3.2, V4.0~ 6.0, Cr4.0~4.8, Mo5.0~5.5, Ni0.5~1.5, W6~10, Nb1.5~3.5, Ti1.0~1.5, Al0.6~1.0, B0.15~0.2, Mg0.7~1.2, Ce0.05~0.15, Re0.035~0.05, Ta0.035~ 0.05, Na0.05~0.2, K0.05~0.2, Si0.3~0.5, Mn0.3~0.5, S≤0.035, P≤0.035, Fe surplus, through melting, cast, annealing etc., prepared intensity, rigid, wearability and resistance to impact High speed steel roll collar.Chinese invention patent CN102703823 also discloses a kind of composite roll collar at a high speed Steel, it is characterised in that the chemical composition of this high-speed steel is made up of following component by weight percentage: C:1.3~ 1.7, V:1.5~2.5, Cr:6.5~7.5, Mo:2.0~4.0, W:4.0~6.0, Nb:3.0~5.0, Co:8.0~9.0, Si < 1.0, Mn < 1.5, P < 0.04, S < 0.04, Y:0.25~0.45%, Ti:0.3~ 0.5, Mg:0.15~0.25, Te:0.15~0.25, B:0.3~0.5, surplus is Fe.Chinese invention patent CN 102703822 also discloses the preparation method of a kind of composite roll collar high-speed steel, it is characterised in that should The chemical composition mass fraction of high-speed steel is: C:1.3%~1.7%, V:1.5%~2.5%, Cr:6.5%~ 7.5%, Mo:2.0%~4.0%, W:4.0%~6.0%, Nb:3.0%~5.0%, Co:8.0%~ 9.0%, Si < 1.0%, Mn < 1.5%, P < 0.04%, S < 0.04%, Y:0.25%~0.45%, Ti: 0.3%~0.5%, Mg:0.15%~0.25%, Te:0.15%~0.25%, B:0.3%~0.5%, remaining Amount is Fe;The preparation method of described high-speed steel is: melting, deoxidation, rotten, centrifugal casting and heat treatment, Described heat treatment includes that quenching and double tempering process.Chinese invention patent CN 102766824 also discloses one Planting wear-resistant high speed steel collars and preparation method thereof, 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.Chinese invention patent CN101596553 also discloses one and is applied to high-speed rod The high speed steel roll collar of milling train and manufacture method thereof, its chemical composition is (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, 0.0 6~0.12Zr, < 0.8Si ,≤1.0Mn, remaining is iron and inevitable trace Impurity.Chinese invention patent CN 101240402 also discloses a kind of for making composite ring roller casting High-boron high-speed steel and heat treatment method thereof, it is the high-abrasive material that a kind of thermal-shock resistance is good, it is possible to apply it His suitable operating mode, its Design of Chemical Composition is (weight %): 0.20-1.10C, 1.0 -2.5B, 3.0-5.0Cr, 0.5-0.9Si, 0.6-1.3Mn, 2.0-10.0V, 0.5-1.5Ni, 1.0-4.0Mo, 0.2-4.0 W, 0.1-2.0Nb, S < 0.04, P < 0.04, remaining is Fe;Its heat Processing method includes annealing, quenching and 2-3 tempering, and annealing heating temperature is 800-860 DEG C, Stove be cooled to less than 500 DEG C after stove is cold or air cooling;Quenching temperature is 1020-1150 DEG C, with The most air-cooled or air cooling;Being tempered 2-3 time, heating-up temperature 500-550 DEG C, stove is cold subsequently or air cooling. Chinese invention patent CN 101191179 also discloses a kind of to high speed steel roll collar and manufacture method thereof.High-speed steel The manufacture method of material includes preparing melt, melting, refining nodularization, spun casting, spheroidizing, heat treatment Quenching, tempering, essence base machining;During refining nodularization, when temperature reaches 1500 DEG C~165 Time between 0 DEG C, adding alterant, the consumption of described alterant is the 0.25%~0.5 of melt total amount 5%.Its reasonable recipe, craft science, easy and simple to handle, compared with common ring roller, have higher firmly Degree, bending strength and shock resistance, thermal fatigue resistance toughness, the features such as thermohardening is good.Chinese invention patent CN 1454723 also disclose a kind of high speed steel compound rolling ring, and collars outer layer is high-speed steel, and collars core is alloying pellet Ink cast iron, it is characterised in that: the chemical composition (mass fraction) of collars outer layer is: C1.2-2.5%, Si0.3-1.5%, Mn0.4-1.0%, Cr3.0-6.0%, Mo1.0-4.0%, V1.0-4.0%, W0.5-3.0%, N B0.5-2.0%, Ti0.01-0.5%, RE0.01-0.5%, P < 0.05%, S < 0.05%, remaining for Fe;The chemical composition (mass fraction) of collars core For: C3.0-3.8%, Si2.2-3.2%, Mn0.3-0.8%, Ni0.2-2.0%, Cr < 0.3%, Mo < 0.3%, Mg0.03 -0.1%, RE >=0.03%, P < 0.1%, S < 0.03, remaining for Fe.In State's patent of invention CN1424423 also discloses a kind of high speed steel rider for all kinds of rod-rolling mills and bar mill Ring and manufacture method thereof, its high speed steel roll collar chemical composition is (mass fraction %): C1.2~3.0; W2.0~6.0;Mo3.0~8.0;V1.0~10.0;Cr4.5~ 12.0;Al0.4~1.5;Ni0.3~1.5;Co0.5~10.0; Nb0.5~5.0;Ti0.1~1.0;Ce0.05~0.30;Na0.0 5~0.30;Mg0.005~0.025;Si < 1.5;Mn < 1.5; S < 0.05;P < 0.05;Remaining is Fe.
But, above-mentioned high speed steel roll collar is still difficult to meet the demand of Kocks milling train, be primarily present wear no resistance and The deficiency that obdurability is low.
Summary of the invention
For the deficiency overcoming above-mentioned common high speed steel roll collar to exist, the present invention is by composition design, cast form Technique and Technology for Heating Processing improve, it is achieved increasing substantially of high speed steel roll collar performance, to meet Kocks The needs of milling train.
The present invention can be realized by following processing step:
(1) first melting high speed steel material in electric induction furnace, when in stove liquid steel temperature reach 1620-1650 DEG C, The mass fraction % of molten steel is: 1.8-2.5C, 3.9-5.0V, 4.5-4.9Mo, 5.1-5.5W, 4.8-5.2Cr, 0.04-0.09N、0.03-0.06Al、0.02-0.05Ca、0.04-0.08Ba、0.5-0.9Si、<0.6Mn、<0.035S、 < 0.040P, surplus are ladle of coming out of the stove during Fe, and during molten steel is come out of the stove, add compound pregnant with steel flow Educating and alterant, compound inoculated and alterant addition accounts for and enters the 1.8-2.4% of steel quality mark in ladle, Chemical composition and the mass fraction % thereof of compound inoculated and alterant are 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0-4.5Mg, 6-8Al, < 0.015S, < 0.025P, surplus Fe, compound inoculated and alterant Particle size is 8-12mm, and has preheated 2-4 hour at 300-360 DEG C before addition;
(2) molten steel in ladle is agitated and after skimming, when temperature is down to 1440-1480 DEG C, poured into from In scheming in the casting mold of High Rotation Speed, casting mold rotating speed is 850-1050 rev/min, and casting mold is that high strength heat resistant closes Gold cast steel, the chemical composition of casting mold and mass fraction % thereof are 0.19-0.28C, 0.15-0.40Si, 1.52-1.80Mn, 0.77-0.95Mo、0.12-0.19Ta、1.5-1.8W、0.15-0.33Cr、0.04-0.07Ce、0.02-0.04Mg、 0.04-0.08Ca, < 0.02S, < 0.035P, surplus Fe, casting mold wall thickness 180-270mm, the painting of casting mold inner surface Covering the zircon flour coating that thickness is 1.5-2.8mm, during pouring molten steel, mold temperature is 140-210 DEG C, and molten steel waters 80-190 second note time, after pouring molten steel completes, casting mold is carried out water-spraying control, make the solidifying of high-speed steel molten steel Gu cooling velocity reaches 10-15 DEG C/s, 90-150 second water-spraying control time, after water spray, casting mold rotating speed is dropped To 650-750 rev/min, foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to 920-950 DEG C after all solidifying, After being incubated 2-3 hour, when being cooled to temperature 690-720 DEG C with stove, it is incubated 6-8 hour, is then cooled to temperature with stove Degree to room temperature, then carries out roughing less than 500 DEG C of air coolings of coming out of the stove;
(3) collars after step (2) roughing is heated to 1050-1075 DEG C with stove, after being incubated 2-4 hour, Come out of the stove air-cooled to temperature be 220-300 DEG C time, be heated to 550-580 DEG C back into stove, be incubated 8-10 hour, It is cooled to temperature with stove and is less than 280 DEG C, continue to be heated to 510-540 DEG C, be incubated 12-15 hour, be cooled to stove Temperature to room temperature less than air cooling of coming out of the stove after 120 DEG C, is refined to given size and precision subsequently, can obtain resistance to Mill high speed steel roll collar.
The present invention is for the wear-resistant high speed steel collars of kocks milling train, in order to ensure to have high-wearing feature and good strong Toughness, and conveniently realize industrialized production, first melting high speed steel material in electric induction furnace, molten steel in stove Mass fraction % be 1.8-2.5C, 3.9-5.0V, 4.5-4.9Mo, 5.1-5.5W, 4.8-5.2Cr, 0.04-0.09N, 0.03-0.06Al, 0.02-0.05Ca, 0.04-0.08Ba, 0.5-0.9Si, surplus is Fe.Wherein add 1.8-2.5%C, Mainly guarantee that carbon is combined with alloying element, it is thus achieved that sufficient amount of high hardness alloy carbide, improve collars resistance to Mill property, part carbon is solid-solution in matrix, can increase substantially hardenability and the quenching degree of matrix.Add 3.9-5.0%V, primarily to obtain the MC type carbide of high rigidity, thus improves the hardness of collars and resistance to Mill property.Add 4.5-4.9%Mo and 5.1-5.5%W, in addition to W, Mo can form high rigidity carbide, Part W, Mo see entrance matrix, increase substantially matrix high temperature hardness, are conducive to the high temperature improving collars resistance to Mill property.Additionally, add 4.8-5.2%Cr, on the one hand may be mentioned that the oxidation-resistance property of high collars, it addition, Entrance matrix is easily decomposed, easy diffusion-precipitation distribution in drawing process during chromium containing carbide high-temperature heat treatment M23C6Type carbide, is conducive to improving the anti-temper resistance energy of collars.Add 0.04-0.09%N, mainly Utilize V with N to be combined the dystectic VN particle of generation, collars solidification group can be promoted as solidification core The refinement knitted.Add 0.03-0.06%Al, 0.02-0.05%Ca and 0.04-0.08%Ba, beneficially deoxidation, remove Slag and change the form of field trash and distribution, increases substantially the obdurability of high speed steel roll collar.When molten steel in stove Temperature reaches to come out of the stove when 1620-1650 DEG C ladle, and during molten steel is come out of the stove, adds compound with steel flow Breeding and alterant, compound inoculated and alterant addition accounts for and enters steel quality mark in ladle 1.8-2.4%, the compound inoculated and chemical composition of alterant and mass fraction % thereof are 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0-4.5Mg, 6-8Al, < 0.015S, < 0.025P, surplus Fe, compound inoculated and alterant Particle size be 8-12mm, and preheated 2-4 hour at 300-360 DEG C before addition.Add compound inoculated With alterant primarily to the solidified structure of refinement collars, improve form and the distribution of eutectic carbide, favorably In the obdurability and the wearability that improve high speed steel roll collar.
Present invention molten steel in ladle is agitated and after skimming, and when temperature is down to 1440-1480 DEG C, is watered Entering on centrifuge in the casting mold of High Rotation Speed, casting mold rotating speed is 850-1050 rev/min, and casting mold is that high intensity is resistance to Thermalloy cast steel, to carry out Quench of spraying water subsequently due to casting mold, and therefore carbon content can not be the highest, otherwise sprays water cold But easily ftracture time, therefore by carbon content control at 0.19-0.28%, in order to ensure the high intensity of casting mold, also add Enter 1.52-1.80%Mn, 0.15-0.33%Cr and 0.15-0.40%Si.In order to improve the high-temperature behavior of casting mold, also Add 0.77-0.95%Mo, 0.12-0.19%Ta and 1.5-1.8%W.In order to refine casting mold solidified structure and carry Its strength and toughness high, is also added into 0.04-0.07%Ce, 0.02-0.04%Mg and 0.04-0.08%Ca.Casting Type wall thickness 180-270mm, casting mold inner surface coating thickness is the zircon flour coating of 1.5-2.8mm, pouring molten steel Time mold temperature be 140-210 DEG C, 80-190 second pouring molten steel time, after pouring molten steel completes, casting mold is entered Row water-spraying control, makes the solidification cooling of high-speed steel molten steel reach 10-15 DEG C/s, water-spraying control time 90-150 Second.Purpose to casting mold water-spraying control is the solidification in order to accelerate high-speed steel molten steel, prevents tungsten in high-speed steel, vanadium Producing segregation greatly Deng unit's procatarxis density contrast, water spraying time is the shortest, and high-speed steel is centrifuged in process of setting and still suffers from partially Analysis phenomenon, reduces the wearability of collars, and water spraying time is long, easy to crack in collars casting process.And spray water After, casting mold rotating speed to be reduced, prevent vibrations that collars causes because of centrifugal force from ftractureing.Will after water spray Casting mold rotating speed is down to 650-750 rev/min, and foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to after all solidifying 920-950 DEG C, after being incubated 2-3 hour, when stove is cooled to temperature 690-720 DEG C, it is incubated 6-8 hour, then stove It is cooled to temperature less than 500 DEG C of air coolings of coming out of the stove to room temperature, collars hardness can be down to 250-280HB, Ke Yiming The aobvious processing characteristics improving collars, then carries out roughing.
Collars after roughing is heated to 1050-1075 DEG C with stove, after being incubated 2-4 hour, it is achieved austenitizing, Come out of the stove air-cooled to temperature be 220-300 DEG C time, be heated to 550-580 DEG C back into stove, both can prevent collars from opening Split, it is also possible to promote M23C6The precipitation of type carbide and retained austenite are transformed into martensite, promote collars The further raising of hardness, is incubated 8-10 hour, and stove is cooled to temperature and is less than 280 DEG C, continues to be heated to 510-540 DEG C, being incubated 12-15 hour, stove is cooled to temperature less than air cooling of coming out of the stove after 120 DEG C to room temperature, Ke Yijin One step eliminates stress, stabilizing tissue, it is ensured that the safety applications of collars, is refined to given size and precision subsequently, Wear-resistant high speed steel collars can be obtained.
The present invention compared with prior art has the advantage that
1) present invention prepares collars simple process, it is easy to accomplish large-scale industrial produces;
2) without rare elements of expensive China such as cobalt, niobium, nickel in collars of the present invention, production cost is relatively Low;
3) collars of the present invention has the mechanical property of excellence, and its hardness is more than 88HSD, and roll surface difference of hardness is less than 1.4HSD, bending strength is more than 2400MPa, and impact flexibility is more than 25J/cm2
4) collars of the present invention uses on kocks milling train, occurs without be full of cracks, peels off and broken roller, and stocking table Face is bright and clean, dimensionally stable, uses the present invention to replace rich chromium cast iron collars and high nickel chromium triangle infinitely chilled ductile cast iron collars, Service life, operating rate of rolling mill significantly improve.Replace carbide roll ring, can thoroughly eliminate peeling and fragmentation, Collars production cost is lower by more than 70% than carbide roll ring simultaneously, and popularization and application collars of the present invention has good Economic and social benefit.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to following example.
Embodiment 1:
Using the high speed steel roll collar of centre spinning casting wall thickness 90mm, concrete step of preparation process is as follows:
(1) first melting high speed steel material in 500 kilograms of medium-frequency induction furnaces, when in stove, liquid steel temperature reaches 1649 DEG C, the mass fraction % of molten steel be 1.81C, 3.94V, 4.88Mo, 5.13W, 5.17Cr, 0.042N, 0.057Al, 0.024Ca, 0.078Ba, 0.58Si, 0.41Mn, 0.028S, 0.036P, surplus is steel of coming out of the stove during Fe Bag, and during molten steel is come out of the stove, add compound inoculated and alterant, compound inoculated and alterant with steel flow Addition accounts for and enters in ladle the 2.4% of steel quality mark, the compound inoculated and chemical composition of alterant and Mass fraction % is 34.96V, 12.01Si, 6.40Sr, 8.28Y, 4.42Mg, 6.20Al, 0.008S, 0.021P, surplus Fe, compound inoculated and alterant particle size is 8-12mm, and it is little to have preheated 4 at 300 DEG C before addition Time;
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1477 DEG C, is poured into centrifuge In the casting mold of upper High Rotation Speed, casting mold rotating speed is 1050 revs/min, and casting mold is high strength thermal resistant alloy cast steel, The chemical composition of casting mold and mass fraction % thereof are 0.23C, 0.26Si, 1.69Mn, 0.84Mo, 0.15Ta, 1.70W, 0.25Cr, 0.058Ce, 0.029Mg, 0.061Ca, 0.011S, 0.027P, surplus Fe, casting mold wall thickness 190mm, Casting mold inner surface coating thickness is the zircon flour coating of 1.9mm, and during pouring molten steel, mold temperature is 161 DEG C, steel 85 seconds durations of pouring of water, after pouring molten steel completes, casting mold is carried out water-spraying control, make the solidifying of high-speed steel molten steel Gu cooling velocity reaches 10-15 DEG C/s, 92 seconds water-spraying control time, after water spray, casting mold rotating speed is down to 750 Rev/min, foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to 940 DEG C after all solidifying, after being incubated 2 hours, When stove is cooled to temperature 700 DEG C, being incubated 7 hours, then stove is cooled to 480 DEG C of air coolings of coming out of the stove of temperature to room temperature, so After carry out roughing;
(3) collars after roughing is heated to 1060 DEG C with stove, after being incubated 3 hours, comes out of the stove air-cooled to temperature During for 250-280 DEG C, being heated to 560 DEG C back into stove, be incubated 9 hours, stove is cooled to temperature 260 DEG C, continues Being heated to 530 DEG C, be incubated 14 hours, stove air cooling of coming out of the stove after being cooled to temperature 100 DEG C, to room temperature, finishes subsequently To given size and precision, can obtain wear-resistant high speed steel collars, its mechanical property is shown in Table 1.
Embodiment 2:
Using the high speed steel roll collar of centre spinning casting wall thickness 120mm, concrete step of preparation process is as follows:
(1) first melting high speed steel material in 500 kilograms of medium-frequency induction furnaces, when in stove, liquid steel temperature reaches 1623 DEG C, the mass fraction % of molten steel be 2.47C, 4.99V, 4.51Mo, 5.46W, 4.84Cr, 0.084N, Come out of the stove during 0.032Al, 0.049Ca, 0.046Ba, 0.82Si, 0.56Mn, 0.031S, 0.038P surplus Fe ladle, And during molten steel is come out of the stove, adding compound inoculated and alterant with steel flow, compound inoculated and alterant adds Amount accounts for and enters in ladle the 1.8% of steel quality mark, the compound inoculated and chemical composition of alterant and quality thereof Mark % is 30.81V, 14.75Si, 5.04Sr, 9.93Y, 3.07Mg, 7.80Al, 0.011S, 0.018P, surplus Fe, Compound inoculated and alterant particle size is 8-12mm, and has preheated 3 hours at 360 DEG C before addition;
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1441 DEG C, is poured into centrifuge In the casting mold of upper High Rotation Speed, casting mold rotating speed is 950 revs/min, and casting mold is high strength thermal resistant alloy cast steel, The chemical composition of casting mold and mass fraction % thereof are 0.27C, 0.36Si, 1.53Mn, 0.94Mo, 0.19Ta, 1.52W, 0.30Cr, 0.067Ce, 0.025Mg, 0.079Ca, 0.013S, 0.024P, surplus Fe, casting mold wall thickness 180mm, Casting mold inner surface coating thickness is the zircon flour coating of 1.5mm, and during pouring molten steel, mold temperature is 163 DEG C, steel 140 seconds durations of pouring of water, after pouring molten steel completes, casting mold is carried out water-spraying control, make the solidifying of high-speed steel molten steel Gu cooling velocity reaches 10-15 DEG C/s, 135 seconds water-spraying control time, after water spray, casting mold rotating speed is down to 700 revs/min, foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to 920 DEG C after all solidifying, be incubated 3 hours After, when stove is cooled to temperature 690 DEG C, it is incubated 8 hours, then stove is cooled to 490 DEG C of air coolings of coming out of the stove of temperature to room temperature, Then roughing is carried out;
(3) collars after roughing is heated to 1050 DEG C with stove, after being incubated 4 hours, comes out of the stove air-cooled to temperature During for 220-250 DEG C, being heated to 580 DEG C back into stove, be incubated 8 hours, stove is cooled to temperature 270 DEG C, continues Being heated to 510 DEG C, be incubated 15 hours, stove air cooling of coming out of the stove after being cooled to temperature 90 DEG C, to room temperature, finishes subsequently To given size and precision, can obtain wear-resistant high speed steel collars, its mechanical property is shown in Table 1.
Embodiment 3:
Using the high speed steel roll collar of centre spinning casting wall thickness 150mm, concrete step of preparation process is as follows:
(1) first melting high speed steel material in 750 kilograms of medium-frequency induction furnaces, when in stove, liquid steel temperature reaches 1637 DEG C, the mass fraction % of molten steel be 2.17C, 4.48V, 4.73Mo, 5.29W, 4.96Cr, 0.058N, 0.047Al, 0.039Ca, 0.060Ba, 0.77Si, 0.39Mn, 0.028S, 0.035P, ladle of coming out of the stove during surplus Fe, And during molten steel is come out of the stove, adding compound inoculated and alterant with steel flow, compound inoculated and alterant adds Amount accounts for and enters in ladle the 2% of steel quality mark, and the compound inoculated and chemical composition of alterant and quality thereof are divided Number % is 32.75V, 13.84Si, 5.81Sr, 8.96Y, 3.74Mg, 6.92Al, 0.014S, 0.022P, and surplus Fe is multiple It is 8-12mm that the particle size with alterant is bred in conjunction, and has preheated 3 hours at 320 DEG C before addition;
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1464 DEG C, is poured into centrifuge In the casting mold of upper High Rotation Speed, casting mold rotating speed is 850 revs/min, and casting mold is high strength thermal resistant alloy cast steel, The chemical composition of casting mold and mass fraction % thereof are 0.21C, 0.16Si, 1.79Mn, 0.78Mo, 0.13Ta, 1.79W, 0.18Cr, 0.042Ce, 0.039Mg, 0.045Ca, 0.017S, 0.028P, surplus Fe, casting mold wall thickness 270mm, Casting mold inner surface coating thickness is the zircon flour coating of 2.7mm, and during pouring molten steel, mold temperature is 206 DEG C, steel 190 seconds durations of pouring of water, after pouring molten steel completes, casting mold is carried out water-spraying control, make the solidifying of high-speed steel molten steel Gu cooling velocity reaches 10-15 DEG C/s, 145 seconds water-spraying control time, after water spray, casting mold rotating speed is down to 650 revs/min, foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to 950 DEG C after all solidifying, be incubated 2 hours After, when stove is cooled to temperature 720 DEG C, it is incubated 6 hours, then stove is cooled to 470 DEG C of air coolings of coming out of the stove of temperature to room temperature, Then roughing is carried out;
(3) collars after roughing is heated to 1075 DEG C with stove, after being incubated 2 hours, comes out of the stove air-cooled to temperature During for 270-300 DEG C, being heated to 550 DEG C back into stove, be incubated 10 hours, stove is cooled to temperature 250 DEG C, continues Continuous be heated to 540 DEG C, be incubated 12 hours, stove air cooling of coming out of the stove after being cooled to temperature 100 DEG C to room temperature, finishing subsequently Work, to given size and precision, can obtain wear-resistant high speed steel collars, and its mechanical property is shown in Table 1.
Table 1 wear-resistant high speed steel collars mechanical property
High-speed steel prepared by the present invention is without the rare strategic material of cobalt, nickel, Ni Deng China, and preparation cost is low, Mechanical property is good, and its hardness is more than 88HSD, and roll surface uniformity of hardness is good, and roll surface difference of hardness is less than 1.4HSD, Bending strength is more than 2400MPa, and impact flexibility is more than 25J/cm2, it is ensured that the safe handling of collars.This Bright collars uses on kocks milling train, without be full of cracks, peels off and the sex-limited generation of broken roller, and stocking any surface finish, Dimensionally stable, uses the present invention to replace rich chromium cast iron collars and high nickel chromium triangle infinitely chilled ductile cast iron collars, service life, Operating rate of rolling mill significantly improves.Replacing carbide roll ring, can thoroughly eliminate peeling and fragmentation, collars is raw simultaneously Producing cost lower by more than 70% than carbide roll ring, popularization and application collars of the present invention has good economy and society Benefit.

Claims (2)

1. the preparation method for the wear-resistant high speed steel collars of kocks milling train, it is characterised in that comprise the following steps:
(1) first melting high speed steel material in electric induction furnace, when in stove, liquid steel temperature reaches 1620-1650 DEG C, the quality of molten steel Mark % is: 1.8-2.5C, 3.9-5.0V, 4.5-4.9Mo, 5.1-5.5W, 4.8-5.2Cr, 0.04-0.09N, 0.03-0.06Al, 0.02-0.05Ca, 0.04-0.08Ba, 0.5-0.9Si, < 0.6Mn, < 0.035S, < 0.040P, surplus are ladle of coming out of the stove during Fe, And during molten steel is come out of the stove, adding compound inoculated and alterant with steel flow, compound inoculated and alterant addition accounts for entrance steel The 1.8-2.4% of steel quality mark in bag, the compound inoculated and chemical composition of alterant and mass fraction % thereof be 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0-4.5Mg, 6-8Al, < 0.015S, < 0.025P, surplus Fe, compound inoculated and change The particle size of matter agent is 8-12mm, and has preheated 2-4 hour at 300-360 DEG C before addition;
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1440-1480 DEG C, is poured on centrifuge at a high speed In the casting mold rotated, casting mold rotating speed is 850-1050 rev/min, and casting mold is high strength thermal resistant alloy cast steel, the chemical composition of casting mold And mass fraction % be 0.19-0.28C, 0.15-0.40Si, 1.52-1.80Mn, 0.77-0.95Mo, 0.12-0.19Ta, 1.5-1.8W, 0.15-0.33Cr, 0.04-0.07Ce, 0.02-0.04Mg, 0.04-0.08Ca, < 0.02S, < 0.035P, surplus Fe, casting mold wall thickness 180-270mm, casting mold inner surface coating thickness is the zircon flour coating of 1.5-2.8mm, and during pouring molten steel, mold temperature is 140-210 DEG C, 80-190 second pouring molten steel time, after pouring molten steel completes, casting mold is carried out water-spraying control, make high-speed steel steel The solidification cooling of water reaches 10-15 DEG C/s, 90-150 second water-spraying control time, is down to by casting mold rotating speed after water spray 650-750 rev/min, foundry goods stops centrifuge and takes out foundry goods and enter stove and be heated to 920-950 DEG C after all solidifying, after being incubated 2-3 hour, When being cooled to temperature 690-720 DEG C with stove, it is incubated 6-8 hour, is then cooled to temperature less than 500 DEG C of air coolings of coming out of the stove to room temperature with stove, Then roughing is carried out;
(3) collars after step (2) roughing is heated to 1050-1075 DEG C with stove, after being incubated 2-4 hour, come out of the stove air-cooled extremely When temperature is 220-300 DEG C, it is heated to 550-580 DEG C back into stove, is incubated 8-10 hour, be cooled to temperature with stove and be less than 280 DEG C, Continue to be heated to 510-540 DEG C, be incubated 12-15 hour, be cooled to temperature less than air cooling of coming out of the stove after 120 DEG C to room temperature with stove, subsequently It is refined to given size and precision, wear-resistant high speed steel collars can be obtained.
A kind of wear-resistant high speed steel collars for kocks milling train prepared the most in accordance with the method for claim 1.
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CN108193127A (en) * 2018-01-10 2018-06-22 芜湖市金贸流体科技股份有限公司 A kind of casting and molding method of rail traffic sleeve type casting
CN108754068A (en) * 2018-05-31 2018-11-06 安徽环渤湾高速钢轧辊有限公司 High pre- finish rolling high speed steel roll collar of line and preparation method thereof

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CN102766824A (en) * 2012-07-04 2012-11-07 北京环渤湾高速钢轧辊有限公司 Abrasion-resistant high-speed-steel roller ring and preparation method thereof
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CN107587085A (en) * 2017-09-08 2018-01-16 太仓森楚源机械设备有限公司 A kind of quenching technical of high intensity hardware stamping part
CN108193127A (en) * 2018-01-10 2018-06-22 芜湖市金贸流体科技股份有限公司 A kind of casting and molding method of rail traffic sleeve type casting
CN108754068A (en) * 2018-05-31 2018-11-06 安徽环渤湾高速钢轧辊有限公司 High pre- finish rolling high speed steel roll collar of line and preparation method thereof

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