CN105755379B - Wear-resistant high speed steel collars for kocks milling trains and preparation method thereof - Google Patents

Wear-resistant high speed steel collars for kocks milling trains and preparation method thereof Download PDF

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CN105755379B
CN105755379B CN201610133574.5A CN201610133574A CN105755379B CN 105755379 B CN105755379 B CN 105755379B CN 201610133574 A CN201610133574 A CN 201610133574A CN 105755379 B CN105755379 B CN 105755379B
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steel
stove
high speed
casting mold
temperature
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CN105755379A (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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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
    • B21B27/025—Skew rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/04—Centrifugal 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Abstract

Wear-resistant high speed steel collars for kocks milling trains and preparation method thereof, belongs to technical field of steel rolling.Using centre spinning method, first in electric induction furnace melting high speed steel material, when in stove liquid steel temperature reach 1,620 1650 DEG C, 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,<0.6Mn、<0.035S、<0.040P, surplus Fe, come out of the stove to ladle, and during molten steel is come out of the stove, compound inoculated and alterant is added with steel flow, when temperature is down to 1,440 1480 DEG C, is poured into the casting mold rotated at a high speed on centrifuge, annealing, roughing, are tempered after being quenched, you can.

Description

Wear-resistant high speed steel collars for kocks milling trains and preparation method thereof
Technical field
It is more particularly to a kind of for the resistance to of kocks milling trains the invention discloses a kind of rolling mill collars and preparation method thereof High speed steel roll collar and preparation method thereof is ground, belongs to technical field of steel rolling.
Background technology
Rod, volume, line are one of common kinds in metallurgic product.Kocks milling trains can not only be used for rod, the finishing rolling mill of volume, Can as high line middle embryo milling train.Production procedure with Kocks milling trains is：Steel embryo is heated, into tandem mill thermal processing distortion, Enter back into Kocks milling trains, Direct Rolling finished product rod, if bulk lots volume, Kocks will enter crimping machine after product roll forming, It is curled into coiling.If wire rod, Kocks milling trains provide middle embryo material for high-speed wire mill, and finished product is rolled out by high-speed wire mill. Kocks milling trains are three-high mill, have 4 rolling mills, and each rolling mill has 3 power transmission shafts, and each rolling mill is arranged on " C modules " In, " C modules " is similar to the memorial archway of duo mill.4 rolling mills are had from the upper Kocks of original design, rolling maximum specification is Φ 50mm.When Kocks milling trains normally put into production, two kinds of combining forms are had according to its rolling specs difference：(1), 4 rolling mills are overall Use；(2), 3 rolling mills and 1 were maked somebody a mere figurehead milling train and were applied in combination.Kocks milling trains have a set of special roll change buggy in dismounting, By 4 rolling mill integral installations or dismounting.
Existing three-high mill is due to design feature of its collars in 120 ° of arrangements of Y types, in rolled bar material, wire rod, tubing And show its outstanding advantages in their difficult deformable metal：(1) it is three-dimensional compression, if alternately rolling in six to compression, it Alternate compression rolled piece, therefore deformation and cool down more uniform.(2) straight on the head substantially reduce, windrow accident is also few.(3) in three rollings Shape of rolling piece is not changed using triangle pass schedule category " similar shape pass " each road very much in machine, therefore, pass collocation is uniform, in tandem rolling Tension force is also more uniform everywhere for rolled piece section；The finished product accuracy that three-high mill is shut out is high, the reachable ± 0.1mm of its dimensional tolerance.
The above-mentioned advantage of three-high mill, ought to promote such milling train, still, due to its design feature, again limit its Widely use；(1) three collars of three-high mill use nonadjustable structure.Although comparatively, structure is simpler, Yi Jia Work is manufactured, and cost is also low, and still, because collars can not be adjusted, after collars is installed, various errors and elastic deformation can not be more Mend, can not be remedied after accumulated error and collars rolling a period of time abrasion, both influence workpiece measurement precision, roll change time is added again Number, with greater need for standby many set frames.(2) if using collars adjustable mill with three roller, although overcome above-mentioned nonadjustable weakness, But, bring three-high mill extremely complex because collars is adjustable.Its processing and manufacturing difficulty is high, and cost is also high, and maintenance is also stranded It is difficult.Therefore, disadvantages mentioned above limits the development of milling train and widely used significantly again.Therefore, high-performance abrasion-proof collars is developed, is Kocks milling trains develop and popularization and application problem urgently to be resolved hurrily.
The current preferable collars of wearability is mainly rich chromium cast iron collars, ni-hard cast iron collars and high speed steel roll collar, and high Fast steel rider ring compares first two collars, because of the MC type carbide containing more high rigidity, with more preferable wearability.In order to improve The performance of high speed steel roll collar, Chinese invention patent CN 103276313 discloses a kind of high speed steel roll collar and heat treatment method, respectively 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.Alloy wear-resisting greatly improved in the invention Property, heat resistance, thermal-shock resistance, reduce the heat fatigue cracking phenomenon that occurs in use of roll and it is resulting fall Meat, burst apart, embody good security and wearability.Chinese invention patent CN 103008668 also discloses a kind of high-speed steel The manufacture method of smooth roll is combined, is comprised the following steps：1) prepared by High Speed Steel Powders；2) High Speed Steel Powders are heat-treated；3) roller Core material and surface texture；4) spray of high speed steel rider set is swaged into shape, synchronous recrystallization and synchronizing ultrasound forging；5) it is combined flat Whole roll heat treatment.The invention prepares High Speed Steel Powders using atomization technique, reduces its hardness to High Speed Steel Powders heat treatment, also The oxygen of introducing in former pulverizing process, roller core is using forged steel material and carries out surface texture, and high speed steel roll collar set is using spray Shape is swaged into, while synchronizing recrystallization control using electromagnetic heating technique, and synchronizing ultrasound forging raising dense structure is carried out Property.Last thermally treated obtain is combined smooth roll.Collars set is tightly combined with roller core, and high-speed steel layer tissue crystal grain is tiny, firmly Degree is high, and performance is good, and manufacturing process technology stability is high, strong adaptability, and operation is reliable.Chinese invention patent CN 104018096 also disclose a kind of high speed steel roll collar and preparation method thereof, and 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 surpluses, by melting, casting, Annealing etc., prepares the high speed steel roll collar of intensity, hardness, wearability and impact resistance.Chinese invention patent CN102703823 Also disclose a kind of composite roll collar high-speed steel, it is characterised in that the chemical composition of the high-speed steel by weight percentage by Following component composition：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.The also public affairs of Chinese invention patent CN 102703822 A kind of preparation method of composite roll collar high-speed steel is opened, it is characterised in that the chemical composition mass fraction of the high-speed steel For：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；The preparation method of the high-speed steel is：Melting, deoxidation, rotten, centrifugal casting and Re Chu Reason, the heat treatment includes quenching and double tempering processing.Chinese invention patent CN 102766824 also discloses a kind of wear-resisting High speed steel roll collar 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 a kind of high speed steel roll collar applied to high-speed rod-rolling mill and its manufacturer Method, 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, 0.06 ~0.12Zr, ＜ 0.8Si ,≤1.0Mn, remaining is iron and inevitable trace impurity.Chinese invention patent CN 101240402, which also disclose one kind, is used to make cast high-boron high-speed steel for composite ring roller and its heat treatment method, and it is A kind of good high-abrasive material of thermal-shock resistance, can also apply other suitable operating modes, and 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, 0.2-4.0W, 0.1-2.0Nb, S ＜ 0.04, P ＜ 0.04, remaining is Fe；Its heat treatment method includes moving back Fire, quenching and 2-3 tempering, annealing heating temperature is 800-860 DEG C, and stove is cold after being furnace-cooled to less than 500 DEG C or air cooling；Quenching Heating-up temperature is 1020-1150 DEG C, subsequent air-cooled or air cooling；Tempering 2-3 times, 500-550 DEG C of heating-up temperature, subsequent stove is cold Or air cooling.Chinese invention patent CN 101191179 also discloses a kind of to high speed steel roll collar and its manufacture method.High speed steel The manufacture method of material includes preparing melt, melting, refining nodularization, spun casting, spheroidizing, heat-treatment quenching, tempering, smart base Machining；During refining nodularization, when temperature is reached between 1500 DEG C~1650 DEG C, alterant, the alterant are added Consumption be melt total amount 0.25%~0.55%.Its reasonable recipe, craft science is easy to operate, with common ring roller Compare, with higher hardness, bending strength and shock resistance, thermal fatigue resistance toughness, the features such as thermohardening is good.Chinese invention patent CN1454723 also discloses a kind of high speed steel compound rolling ring, and collars outer layer is high-speed steel, and collars core is alloy nodular cast iron, It is characterized 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%, Nb0.5-2.0%, Ti0.01-0.5%, RE0.01-0.5%, P ＜ 0.05%, S ＜ 0.05%, remaining is Fe；The chemical composition (mass fraction) of collars core is: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 is Fe.Chinese invention patent CN1424423 also discloses a kind of for all kinds of The high speed steel roll collar and its manufacture method of rod-rolling mill and bar mill, its high speed steel roll collar chemical composition are (quality point Number %)：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；Na0.05~0.30；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 the demand for meeting Kocks milling trains, is primarily present and wears no resistance and obdurability Low deficiency.
The content of the invention
To overcome the shortcomings of that above-mentioned common high speed steel roll collar is present, the present invention is by composition design, casting forming process It is improved with Technology for Heating Processing, realizes increasing substantially for high speed steel roll collar performance, the need for meets Kocks milling trains.
The present invention can be realized by following processing step：
(1) the first melting high speed steel material in electric induction furnace, when liquid steel temperature reaches 1620-1650 DEG C, molten steel in stove Mass fraction % 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 go out when being Fe Stove adds compound inoculated and alterant to ladle, and during molten steel is come out of the stove with steel flow, and compound inoculated and alterant is added Amount accounts for the 1.8-2.4% into steel quality fraction in ladle, the chemical composition and its quality point of compound inoculated and alterant Number % be 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0-4.5Mg, 6-8Al,<0.015S、<0.025P, surplus Fe, The particle size of compound inoculated and alterant is 8-12mm, and has been preheated before addition at 300-360 DEG C 2-4 hours；
(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 of rotation, casting mold rotating speed is 850-1050 revs/min, and casting mold is high strength thermal resistant alloy cast steel, the change of casting mold It is 0.19-0.28C, 0.15-0.40Si, 1.52-1.80Mn, 0.77-0.95Mo, 0.12- to learn composition and its mass fraction % 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 1.5-2.8mm zircon flour coating, steel Mold temperature is 140-210 DEG C when water is poured into a mould, and 80-190 seconds pouring molten steel time, after the completion of pouring molten steel, casting mold is sprayed Water cooling, makes the solidification cooling of high-speed steel molten steel reach 10-15 DEG C/s, 90-150 seconds water-spraying control time, water spray is finished Casting mold rotating speed is down to 650-750 revs/min afterwards, casting stops centrifuge taking-up casting and enters stove heat to 920- after all solidifying 950 DEG C, after insulation 2-3 hour, during with being furnace-cooled to 690-720 DEG C of temperature, then insulation 6-8 hours is less than with being furnace-cooled to temperature Come out of the stove for 500 DEG C and be air-cooled to room temperature, then carry out roughing；
(3) collars after step (2) roughing after being incubated 2-4 hours, is come out of the stove air-cooled with stove heat to 1050-1075 DEG C To temperature be 220-300 DEG C when, back into stove heat to 550-580 DEG C, be incubated 8-10 hour, be furnace-cooled to temperature be less than 280 DEG C, continue to be heated to 510-540 DEG C, be incubated 12-15 hours, room temperature is air-cooled to being come out of the stove after being furnace-cooled to temperature less than 120 DEG C, with After be refined to given size and precision, you can obtain wear-resistant high speed steel collars.
The present invention is used for the wear-resistant high speed steel collars of kocks milling trains, in order to ensure there is high-wearing feature and good obdurability, And industrialized production is conveniently realized, and the melting high speed steel material first in electric induction furnace, the mass fraction % of molten steel is in stove 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 are Fe.1.8-2.5%C is wherein added, carbon and alloy member is mainly to ensure that Element is combined, and obtains sufficient amount of high hardness alloy carbide, improves collars wearability, and part carbon is solid-solution in matrix, Ke Yi great Amplitude improves the hardenability and quenching degree of matrix.3.9-5.0%V is added, primarily to the MC type carbide of high rigidity is obtained, So as to improve the hardness and wearability of collars.4.5-4.9%Mo and 5.1-5.5%W is added, except W, Mo can form high rigidity carbon Outside compound, part W, Mo, which are seen, enters matrix, increases substantially matrix high temperature hardness, is conducive to improving the high temperature abrasion resistance of collars. In addition, adding 4.8-5.2%Cr, the oxidation-resistance property of high collars is on the one hand may be mentioned that, in addition, chromium containing carbide high temperature Easily decomposed during heat treatment and enter matrix, the M of easy diffusion-precipitation distribution in drawing process23C6Type carbide, is conducive to improving roller The anti-temper resistance energy of ring.0.04-0.09%N is added, it is main that the dystectic VN particles of generation, Ke Yizuo are combined with N using V For solidification core, promote the refinement of collars solidified structure.Add 0.03-0.06%Al, 0.02-0.05%Ca and 0.04- 0.08%Ba, is conducive to deoxidation, slagging-off and form and the distribution for changing field trash, increases substantially the tough of high speed steel roll collar Property.Come out of the stove to ladle, and during molten steel is come out of the stove, added with steel flow when liquid steel temperature reaches 1620-1650 DEG C in stove Compound inoculated and alterant, compound inoculated and alterant addition accounts for the 1.8-2.4% into steel quality fraction in ladle, multiple Close that to breed with the chemical composition and its mass fraction % of alterant be 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0- 4.5Mg,6-8Al,<0.015S,<0.025P, surplus Fe, the particle size of compound inoculated and alterant is 8-12mm, and is being added Preheated before entering at 300-360 DEG C 2-4 hours.Compound inoculated and alterant is added primarily to the solidification group of refinement collars Knit, improve form and the distribution of eutectic carbide, be conducive to improving the obdurability and wearability of high speed steel roll collar.
Molten steel of the present invention in ladle is agitated and after skimming, and when temperature is down to 1440-1480 DEG C, is poured into centrifugation In the casting mold rotated at a high speed on machine, casting mold rotating speed is 850-1050 revs/min, and casting mold is high strength thermal resistant alloy cast steel, due to Casting mold will then carry out water spray Quench, therefore carbon content can not be too high, is otherwise easily ftractureed during water-spraying control, therefore by carbon content Control in 0.19-0.28%, in order to ensure the high intensity of casting mold, be additionally added 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, be also added into 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 improve its strength and toughness, 0.04-0.07%Ce, 0.02- are also added into 0.04%Mg and 0.04-0.08%Ca.Casting mold wall thickness 180-270mm, casting mold inner surface coating thickness is 1.5-2.8mm zirconium English Powder coating, mold temperature is 140-210 DEG C during pouring molten steel, 80-190 seconds pouring molten steel time, after the completion of pouring molten steel, to casting Type carries out water-spraying control, the solidification cooling of high-speed steel molten steel is reached 10-15 DEG C/s, 90-150 seconds water-spraying control time. It is to accelerate the solidification of high-speed steel molten steel, prevent first procatarxis density such as tungsten in high-speed steel, vanadium to the purpose of casting mold water-spraying control Poor to produce segregation greatly, water spraying time is too short, still suffers from segregation phenomena in high-speed steel centrifugation process of setting, reduces the wear-resisting of collars Property, water spraying time is long, easy to crack in collars casting process.And water spray finish after, to reduce casting mold rotating speed, prevent collars because Shake and ftracture caused by centrifugal force.Casting mold rotating speed is down to 650-750 revs/min by water spray after finishing, and casting is all after solidification Stop centrifuge and take out casting to enter stove heat to 920-950 DEG C, after insulation 2-3 hour, when being furnace-cooled to 690-720 DEG C of temperature, be incubated 6-8 hours, then it is furnace-cooled to temperature and is come out of the stove less than 500 DEG C and be air-cooled to room temperature, collars hardness can be down to 250-280HB, can To be obviously improved the processing characteristics of collars, roughing is then carried out.
Collars after roughing, to 1050-1075 DEG C, after being incubated 2-4 hours, realizes austenitizing, wind of coming out of the stove with stove heat Be cooled to temperature for 220-300 DEG C when, back into stove heat to 550-580 DEG C, can both prevent collars from ftractureing, M can also be promoted23C6 The precipitation of type carbide and retained austenite are transformed into martensite, promote the further raising of collars hardness, and insulation 8-10 is small When, temperature is furnace-cooled to less than 280 DEG C, continues to be heated to 510-540 DEG C, is incubated 12-15 hours, is furnace-cooled to temperature less than 120 DEG C After come out of the stove and be air-cooled to room temperature, can further eliminate stress, stabilizing tissue, it is ensured that the safety applications of collars, then be refined to Given size and precision, you can obtain wear-resistant high speed steel collars.
The present invention has advantages below compared with prior art：
1) present invention prepares collars technique simplicity, it is easy to accomplish scale industrial production；
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 excellent mechanical property, 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 is used on kocks milling trains, is occurred without cracking, is peeled off and broken roller, and stocking any surface finish, chi Very little stabilization, using present invention substitution 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, peeling and fragmentation can be thoroughly eliminated, while collars production cost compares carbide roll ring Low by more than 70%, popularization and application collars of the present invention has good economic and social benefit.
Embodiment
The present invention is further described with reference to embodiments, but the present invention is not limited to following examples.
Embodiment 1：
Wall thickness 90mm high speed steel roll collar is cast using centre spinning, specific step of preparation process is as follows：
(1) first in 500 kilograms of medium-frequency induction furnaces melting high speed steel material, when in stove liquid steel temperature reach 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 are come out of the stove to ladle, and during molten steel is come out of the stove when being Fe, Compound inoculated and alterant is added with steel flow, compound inoculated and alterant addition is accounted for into steel quality fraction in ladle 2.4%, the chemical composition and its mass fraction % of compound inoculated and alterant are 34.96V, 12.01Si, 6.40Sr, 8.28Y, 4.42Mg, 6.20Al, 0.008S, 0.021P, surplus Fe, the particle size of compound inoculated and alterant is 8-12mm, and is being added Preheated before entering at 300 DEG C 4 hours；
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1477 DEG C, is poured on centrifuge and revolved at a high speed In the casting mold turned, 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 its Mass fraction % be 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 are 1.9mm zirconium English powder Coating, mold temperature is 161 DEG C during pouring molten steel, 85 seconds pouring molten steel time, after the completion of pouring molten steel, casting mold is sprayed water Cooling, makes the solidification cooling of high-speed steel molten steel reach that 10-15 DEG C/s, 92 seconds water-spraying control time, water spray will castings after finishing Type rotating speed is down to 750 revs/min, and casting stops centrifuge taking-up casting and enters stove heat to 940 DEG C after all solidifying, be incubated 2 hours Afterwards, when being furnace-cooled to 700 DEG C of temperature, 7 hours are incubated, 480 DEG C of temperature is then furnace-cooled to and comes out of the stove and be air-cooled to room temperature, then carry out slightly plus Work；
(3) collars after roughing with stove heat to 1060 DEG C, insulation 3 hours after, come out of the stove it is air-cooled to temperature be 250-280 DEG C when, back into stove heat to 560 DEG C, be incubated 9 hours, be furnace-cooled to 260 DEG C of temperature, continue to be heated to 530 DEG C, insulation 14 is small When, it is furnace-cooled to come out of the stove after 100 DEG C of temperature and is air-cooled to room temperature, be then refined to given size and precision, you can obtains wear-resisting height Fast steel rider ring, its mechanical property is shown in Table 1.
Embodiment 2：
Wall thickness 120mm high speed steel roll collar is cast using centre spinning, specific step of preparation process is as follows：
(1) first in 500 kilograms of medium-frequency induction furnaces melting high speed steel material, when in stove liquid steel temperature reach 1623 DEG C, The mass fraction % of molten steel be 2.47C, 4.99V, 4.51Mo, 5.46W, 4.84Cr, 0.084N, 0.032Al, 0.049Ca, Come out of the stove when 0.046Ba, 0.82Si, 0.56Mn, 0.031S, 0.038P surplus Fe to ladle, and during molten steel is come out of the stove, with steel Current add compound inoculated and alterant, and compound inoculated and alterant addition is accounted for into steel quality fraction in ladle 1.8%, the chemical composition and its mass fraction % of compound inoculated and alterant are 30.81V, 14.75Si, 5.04Sr, 9.93Y, 3.07Mg, 7.80Al, 0.011S, 0.018P, surplus Fe, the particle size of compound inoculated and alterant is 8-12mm, and is being added Preheated before entering at 360 DEG C 3 hours；
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1441 DEG C, is poured on centrifuge and revolved at a high speed In the casting mold turned, casting mold rotating speed is 950 revs/min, and casting mold is high strength thermal resistant alloy cast steel, the chemical composition and its matter of casting mold Fraction % is measured for 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 are 1.5mm zirconium English powder Coating, mold temperature is 163 DEG C during pouring molten steel, 140 seconds pouring molten steel time, after the completion of pouring molten steel, casting mold is sprayed Water cooling, makes the solidification cooling of high-speed steel molten steel reach that 10-15 DEG C/s, 135 seconds water-spraying control time, water spray will after finishing Casting mold rotating speed is down to 700 revs/min, and casting stops centrifuge taking-up casting and enters stove heat to 920 DEG C after all solidifying, insulation 3 is small Shi Hou, when being furnace-cooled to 690 DEG C of temperature, is incubated 8 hours, is then furnace-cooled to 490 DEG C of temperature and comes out of the stove and is air-cooled to room temperature, then carries out thick Processing；
(3) collars after roughing with stove heat to 1050 DEG C, insulation 4 hours after, come out of the stove it is air-cooled to temperature be 220-250 DEG C when, back into stove heat to 580 DEG C, be incubated 8 hours, be furnace-cooled to 270 DEG C of temperature, continue to be heated to 510 DEG C, insulation 15 is small When, it is furnace-cooled to come out of the stove after 90 DEG C of temperature and is air-cooled to room temperature, be then refined to given size and precision, you can obtains wear-resisting high speed Steel rider ring, its mechanical property is shown in Table 1.
Embodiment 3：
Wall thickness 150mm high speed steel roll collar is cast using centre spinning, specific step of preparation process is as follows：
(1) first in 750 kilograms of medium-frequency induction furnaces melting high speed steel material, when in stove liquid steel temperature reach 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, come out of the stove to ladle, and during molten steel is come out of the stove during surplus Fe, with Steel flow adds compound inoculated and alterant, and compound inoculated and alterant addition is accounted for into steel quality fraction in ladle 2%, the chemical composition and its mass fraction % of compound inoculated and alterant are 32.75V, 13.84Si, 5.81Sr, 8.96Y, 3.74Mg, 6.92Al, 0.014S, 0.022P, surplus Fe, the particle size of compound inoculated and alterant is 8-12mm, and is being added Preheated before entering at 320 DEG C 3 hours；
(2) molten steel in ladle is agitated and after skimming, and when temperature is down to 1464 DEG C, is poured on centrifuge and revolved at a high speed In the casting mold turned, casting mold rotating speed is 850 revs/min, and casting mold is high strength thermal resistant alloy cast steel, the chemical composition and its matter of casting mold Fraction % is measured for 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 are 2.7mm zirconium English powder Coating, mold temperature is 206 DEG C during pouring molten steel, 190 seconds pouring molten steel time, after the completion of pouring molten steel, casting mold is sprayed Water cooling, makes the solidification cooling of high-speed steel molten steel reach that 10-15 DEG C/s, 145 seconds water-spraying control time, water spray will after finishing Casting mold rotating speed is down to 650 revs/min, and casting stops centrifuge taking-up casting and enters stove heat to 950 DEG C after all solidifying, insulation 2 is small Shi Hou, when being furnace-cooled to 720 DEG C of temperature, is incubated 6 hours, is then furnace-cooled to 470 DEG C of temperature and comes out of the stove and is air-cooled to room temperature, then carries out thick Processing；
(3) collars after roughing with stove heat to 1075 DEG C, insulation 2 hours after, come out of the stove it is air-cooled to temperature be 270-300 DEG C when, back into stove heat to 550 DEG C, be incubated 10 hours, be furnace-cooled to 250 DEG C of temperature, continue to be heated to 540 DEG C, insulation 12 is small When, it is furnace-cooled to come out of the stove after 100 DEG C of temperature and is air-cooled to room temperature, be then refined to given size and precision, you can obtains wear-resisting height Fast steel rider ring, its mechanical property is shown in Table 1.
The wear-resistant high speed steel collars mechanical property of table 1
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 Can be good, 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, and bending strength is more than 2400MPa, impact flexibility is more than 25J/cm2, it is ensured that the safe handling of collars.Collars of the present invention is used on kocks milling trains, No cracking, peeling and the sex-limited generation of broken roller, and stocking any surface finish, dimensionally stable, replace rich chromium cast iron collars using the present invention With high nickel chromium triangle infinitely chilled ductile cast iron collars, service life, operating rate of rolling mill are significantly improved.Replace carbide roll ring, can be thorough Eliminate and peel off and fragmentation, while collars production cost is lower than carbide roll ring by more than 70%, popularization and application collars tool of the present invention There is good economic and social benefit.

Claims (2)

1. the preparation method of a kind of wear-resistant high speed steel collars for kocks milling trains, it is characterised in that comprise the following steps：
(1) the first melting high speed steel material in electric induction furnace, when liquid steel temperature reaches 1620-1650 DEG C, the quality of molten steel in stove Fraction % 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 go out when being Fe Stove adds compound inoculated and alterant to ladle, and during molten steel is come out of the stove with steel flow, and compound inoculated and alterant is added Amount accounts for the 1.8-2.4% into steel quality fraction in ladle, the chemical composition and its quality point of compound inoculated and alterant Number % be 30-35V, 12-15Si, 5.0-6.5Sr, 8-10Y, 3.0-4.5Mg, 6-8Al,<0.015S、<0.025P, surplus Fe, The particle size of compound inoculated and alterant is 8-12mm, and has been preheated before addition at 300-360 DEG C 2-4 hours；
(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 of rotation, casting mold rotating speed is 850-1050 revs/min, and casting mold is high strength thermal resistant alloy cast steel, the chemical group of casting mold Into and its 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 are 1.5-2.8mm zircon flour coating, casting mold during pouring molten steel Temperature is 140-210 DEG C, 80-190 seconds pouring molten steel time, and after the completion of pouring molten steel, water-spraying control is carried out to casting mold, is made at a high speed The solidification cooling of steel molten steel reaches 10-15 DEG C/s, and 90-150 seconds water-spraying control time, water spray drops casting mold rotating speed after finishing To 650-750 revs/min, casting stops centrifuge taking-up casting and enters stove heat to 920-950 DEG C after all solidifying, insulation 2-3 is small Shi Hou, during with being furnace-cooled to 690-720 DEG C of temperature, is incubated 6-8 hours, is then air-cooled to being furnace-cooled to temperature and come out of the stove less than 500 DEG C Room temperature, then carries out roughing；
(3) collars after step (2) roughing after being incubated 2-4 hours, is come out of the stove air-cooled to warm with stove heat to 1050-1075 DEG C Spend for 220-300 DEG C when, back into stove heat to 550-580 DEG C, be incubated 8-10 hour, be furnace-cooled to temperature be less than 280 DEG C, after It is continuous to be heated to 510-540 DEG C, 12-15 hours are incubated, room temperature is air-cooled to being come out of the stove after being furnace-cooled to temperature less than 120 DEG C, then essence It is machined to given size and precision, you can obtain wear-resistant high speed steel collars.
2. a kind of wear-resistant high speed steel collars for kocks milling trains prepared in accordance with the method for claim 1.
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Denomination of invention: Wear-resistant high speed steel roll ring for kocks mill and its preparation method

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