CN105618715A - Abrasion-resistance high-speed steel composite roller and preparation method thereof - Google Patents

Abrasion-resistance high-speed steel composite roller and preparation method thereof Download PDF

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Publication number
CN105618715A
CN105618715A CN201610022618.7A CN201610022618A CN105618715A CN 105618715 A CN105618715 A CN 105618715A CN 201610022618 A CN201610022618 A CN 201610022618A CN 105618715 A CN105618715 A CN 105618715A
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roll
steel
stove
temperature
speed steel
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CN201610022618.7A
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CN105618715B (en
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张政龙
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安徽环渤湾高速钢轧辊有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product
    • B22D19/16Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • 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
    • B22D13/02Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • 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
    • 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
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/04Cast-iron alloys containing spheroidal graphite
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous 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
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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

Abstract

The invention discloses an abrasion-resistance high-speed steel composite roller and a preparation method thereof, and belongs to the technical field of rollers. The composite roller forms a whole through roller body high-speed steel and roller core nodular cast iron by means of centrifuge composite casting. The roller body molten steel is controlled to comprise, by mass, 1.5%-2.4% of C, 3.5%-6.0% of Cr, 3.5%-6.0% of Mo, 3.5%-6.0% of V, 1.5%-3.5% of W, 0.6%-1.2% of Nb, 0.5%-1.2% of Ni, 0.3%-0.8% of Si, 0.3%-0.8% of Mn, 0-0.04% of S, 0-0.04% of P and the balance Fe. The roller body molten steel is deoxidized, external-furnace modification treatment is conducted on the molten steel through multi-element micro-alloy wires, and then pouring is conducted on a centrifugal machine to form the roller; the roller core is made of nodular cast iron, tempering is conducted on the roller after quenching, and therefore the characteristics of being high in hardness, high in toughness, good in abrasive resistance and the like are realized, and an excellent using effect is achieved.

Description

A kind of wear-resistant high speed steel composite roll and preparation method thereof
Technical field
The invention discloses a kind of wear-resistant composite roller and preparation method thereof, particularly to a kind of wear-resistant high speed steel composite roll and preparation method thereof, belong to roll technology field.
Background technology
Roll is the important consumption spare part in Rolling production, what roll quality had both affected stocking shows quality and dimensional accuracy, also the production operational availability of milling train is affected, therefore improving roll wearability is the key subjects that countries in the world roll development person constantly pays close attention to, for a long time, the kinds such as high-chromium iron-cast roller, chilled cast iron roll and ferrosteel roll are commonly used both at home and abroad. Chinese invention patent CN102371273 discloses a kind of high-chromium iron-cast roller and production method thereof, it is characterized in that, alloying component W and V is with the addition of during skin of the roll melting, Technology for Heating Processing obtains the MC type carbide spherical, block of tempered martensite and Dispersed precipitate, it is ensured that matrix has high obdurability and hardness. the chemical component weight percentage ratio of described skin of the roll is: C2.3��3.0%, Si0.4��1.0%, Mn0.4��1.0%, P < 0.06%, S < 0.01%, Cr15��20%, Ni1.0��1.5%, Mo3.5��5.0%, V0.5��1.0%, W0.1��0.5%, and all the other are Fe. compared with prior art, this beneficial effect of the invention is: add V and W, improves the high temperature red hardness of roll, improving Technology for Heating Processing, the roll millimeter stocking after improvement increases by 20%��30% on year-on-year basis, and the reconditioning quality of average roll every time is within 0.3. Chinese invention patent CN101537427 also discloses a kind of composite roll for centrifugally casting high-chromium cast iron and preparation method thereof, including skin of the roll and roll roller core, the chemical component weight % of the material of described skin of the roll is: the alloy iron filings of the high Ni-Cr infinite cold hardness cast iron roll of 25��28%, the carbon ferrochrome of 28��30%, the mid-carbon fe-mn of 1.5��2.5%, the ferro-boron of 2.5��3.5%, the calsibar alloy of 0.5��0.8%, the aluminum of 0.2��0.4%, the ferrotianium of 0.3��0.5%, the rare earth ferrosilicon of 0.2��0.4%, the zinc of 0.10��0.15%, the magnesium of 0.15��0.18%, surplus is low-carbon waste steel sheet, described roll roller core is high-strength alloy cast iron or low-alloy spheroidal graphite cast-iron, and described skin of the roll and roller core two parts are formed by centrifugal composite casting. advantage: roll low production cost, in roll, field trash is few, organizes high purity, roll quenching degree and hardenability can be improved, be conducive to the raising of roll mechanical property and thermal fatigue property, high life, production cost is low.
Chinese invention patent CN103526125 discloses and relates to a kind of ferrosteel roll and manufacture method thereof, by roll neck, the body of roll and roller core composition, the chemical composition mass percent of its body of roll is: C:2.15��2.40%, Si0.25��0.45%, Mn0.7��1.0%, Mo0.15��0.40%, Ni0.9��1.1%, Cr2.2��2.5%, V0.10��0.15%, Ti0.8��1.0%, N0.02��0.06%, La0.02��0.05%, Ce0.02��0.05, and 0.05%��La+Ce��0.08%, B0.010-0.025%, Al0.8��1.0%, P��0.05%, S��0.03%, surplus Fe, because solidified structure is tiny, good processability, spheroidizing can be cancelled, shorten the production cycle, reduce energy consumption. Chinese invention patent CN101537428 also discloses a kind of ferrosteel roll and preparation method thereof, belongs to technical field of steel rolling. its chemical composition and mass percent thereof be: C:1.65-1.90%, Cr:0.80-1.15%, Si:0.35-0.65%, Mn:0.60-1.00%, Mo:0.30-0.60%, Ni:0.20-0.80%, K:0.05-0.10%, Na:0.05-0.10%, Ti:0.05-0.15%, Nb:0.05-0.15%, Y:0.08-0.15%, Mg:0.03-0.08%, Zn:0.02-0.04%, Al:0.60-1.00%, P:< 0.04%, S:< 0.03%, all the other are Fe. advantage: rationally, the hardness of roll body of ferrosteel roll is up to 55-58HS, and tensile strength is up to 900-950MPa, and impact toughness reaches 10-12J/cm for chemical composition composition2; Nickel resources can be saved and reduce cost; Heat treatment can be simplified, shorten the manufacturing cycle, improve heat treatment efficiency and save the energy; Can thinning solidification structure, improve the form of carbide and the uniformity of distribution and the segregation of alloying element can be suppressed; Service life improves. Chinese invention patent CN101892374 also discloses the heat treatment method of a kind of high rigidity ferrosteel roll, it is adaptable to material is 155CrNiMo or 180CrNiMo barrel diameter is the roll of �� 850��1350mm. Heat-treatment technology method includes roll entirety is heated to normalizing temperature 950-1000 DEG C, and is incubated 15��30h; Rapidly roll being hung out heating furnace, put in quenching oil and cool down, make roller surface temperature reach 230��250 DEG C, the temperature of 50mm depths is 270��300 DEG C, temperature 400-450 DEG C of 100mm depths; Again roll is hung rapidly on spraying machine and carries out quenching, make roller surface temperature reach��480 DEG C and no longer heat up after progressively lower blast again, the cooling rate of whole air-cooled process controls at 2-5 DEG C/min; When roller surface temperature can be maintained at less than 480 DEG C more than 300 DEG C and no longer heat up, air cooling. This invention changes the heat treatment method that ferrosteel roll is conventional, by appropriately controlling the chilling temperature of oil cooling time, different phase, has broken half steel and cast iron materials can not carry out the idea of oil cooling process; Again through the intensity controlling air quantity and blowing, make roll cool down under certain rate of cooling, by effective cooperation of oil cooling and air-cooled two kinds of cooling means, make the large-scale ferrosteel roll hardness of high rigidity reach more than 55HSD.
Chinese invention patent CN1598030 discloses about to intermetallic composite coating hot rolling, cold rolled sheet roll material--the improvement of Ni-Cr-Mo infinitely chilled ductile cast iron, particularly relate to a kind of wearability and heat resistanceheat resistant crack performance is good, the roll of long service life Ni-Cr-Mo infinitely chilled ductile cast iron, is characterized in that being added with the boron of 0.03-0.1% (WT) and the niobium of 0.2-1.5% in Ni-Cr-Mo infinitely chilled ductile cast iron (IV) composition. and the composite roll that thus material is made. owing to the addition of boron and niobium, make the wearability of material and heat resistanceheat resistant crack performance be significantly improved, overcome raw-material deficiency. thus material is the composite roll that working lining is made, and service life was greatly improved more originally, and the amount of rolling of strip can be made to improve more than 20%, the improvement of heat resistanceheat resistant crack performance, significantly reduces shutdown roll change and repairs number of times, not only reduce operation labor intensity, but also can improve the operating rate of milling train, increase rolling yield during class. Chinese invention patent CN101177759 also discloses a kind of centrifugal composite modified indefinite chilled cast iron roller and preparation method thereof, its body of roll chemical composition is (weight %): 3.2-3.8C, 3.8-4.5Ni, 1.2-1.8Cr, 0.2-0.4Mo, 0.2-0.5Cu, 1.0-1.8Si, < 0.8Mn, 0.10-0.30Nb, 0.05-0.20V, 0.05-0.20Ti, 0.04-0.07Mg, 0.02-0.05Y, 0.01-0.03Sb, all the other are Fe and inevitable trace impurity. roll of the present invention utilizes electric furnace just can produce, employing centre spinning method shapes, roll strength and hardness are high, and toughness, uniformity of hardness and quenching degree are good, wearability and oxidation resistant, anti-chilling and shock heating performance is also fine, use procedure is not ruptured, non-scale, do not chap, non-stick steel, serviceability is substantially better than high Ni-Cr infinite cold hardness cast iron roll, and production technology is simple, being made without high-temperature heat treatment, production cost is low. use this invention roll can significantly improve rolling mill operating rate, reduce stocking production cost, improve stocking surface quality, there is good economic and social benefit. Chinese invention patent CN101509095 also discloses ultra-fine grain high-nickel-chromium molybdenum infinitely chilled ductile cast iron, belong to and roll large-scale ships roll material, composition weight includes: C:2.9-3.7%, Si:0.6-1.2%, Mn:0.4-1.2%, Ni:3.01-5.00%, Cr:1.00-2.00%, Mo:0.20-0.60%, surplus Fe, composition also has the antimony of 1-3%, the network structure making carbide obtains basic elimination, organize disperse more, metallographic structure and the performance of material are reached to change, the wearability and the heat resistanceheat resistant crack performance that make material are effectively combined, the comprehensive service life improving material.
But it is low that above-mentioned roll kind is primarily present hardness, the deficiency that in roll, high rigidity hard carbide quantity is few, cause that roll wears no resistance, service life is short, in this context, develops the roll product high-speed steel roll of new generation of excellent performance both at home and abroad. Chinese invention patent CN105033227 discloses the manufacture method of a kind of high-vanadium high-speed steel composite roll suitable in narrow strip rolling mill. Described manufacture method includes adopting casting method for centrifugal cast body of roll outer layer, after pouring body of roll outer layer high-vanadium high-speed steel water, it is continually fed into noble gas in body of roll outer layer die cavity, stop centrifuge when high-vanadium high-speed steel exospheric temperature reaches 1220��1280 DEG C to rotate, stop noble gas being blown into, then mould assembling cast body of roll core molten iron simultaneously. This invention significantly improves the combination rate of outer layer high-vanadium high-speed steel and core molten iron, combination rate is increased to 100% by 40%, bond strength was promoted to about 450Mpa by former about 350Mpa so that high-vanadium high-speed steel roller body of roll binder course resistance to flaking is greatly improved; Can effectively removing the carbide former amount of core molten iron corrosion outer layer simultaneously, thus improving roll neck tissue, improve the tensile strength of roll neck, effectively stop the roll breakage phenomenon in using. Chinese invention patent CN104525889 also discloses a kind of manufacture method suitable in light-section mill, the high-speed steel roll of wire and bar mill. Described manufacture method includes melting raw material, moulding by casting, machining and three processing steps of heat treatment; On the basis of centrifugal casting high-speed steel molten iron, first it is poured into transition zone molten iron, then realizes the displacement completely of transition zone molten iron again through cast core molten iron. This invention significantly improves the bond strength of outer layer high-speed steel and core molten iron, and bond strength was promoted to more than 500Mpa by former about 350Mpa so that high-speed steel roll body of roll binder course resistance to flaking is greatly improved; Can effectively removing the carbide former amount of core molten iron corrosion outer layer simultaneously, thus improving roll neck tissue, improve the tensile strength of roll neck, effectively stop the roll breakage phenomenon in using. Chinese invention patent CN104353798 also discloses the manufacture method of the high-speed steel working roll for hot continuous rolling precision rolling rear, the chemical composition of described body of roll working lining and the weight percentage of each composition be: C2.00��3.50%, Si0.40��2.00%, Mn0.50��1.20%, Cr1.50��4.50%, Ni2.00��5.00%, Mo+V+W+Nb2.00��10.00%, S��0.05%, P��0.10%, all the other are Fe and inevitable impurity. Its manufacture method includes melting, breeds and spheroidising, cast, heat treatment step, and this invention, by alloying component reasonable in design and production technology, obtains special graphite and metallographic structure. Hot continuous rolling precision rolling rear high carbon high speed steel roll can effectively control machine rear surface quality under roll, improves wearability and the hot-cracking resistance of roll simultaneously. Chinese invention patent CN104308113 also discloses a kind of high-speed steel roll centrifugal composite casting method of low interfacial failure, the method step is as follows: 1), on centrifuge in the roll casting mold of high speed rotating, pouring temperature is the outer layer high-speed steel molten steel of 1400��1450 DEG C, is poured in backward casting mold and adds covering slag; 2), determine cast opportunity and the pouring temperature of molten ductile cast iron respectively according to the chemical composition in high-speed steel molten steel and the chemical composition in molten ductile cast iron, and control transition zone cast thickness;3), when the interface temperature of transition zone inner surface is cooled to 1050��1150 DEG C, hanging out roll mould assembling and closing, static casting temperature is the core high temperature molten ductile cast iron of 1330��1370 DEG C, 4), insulation be cooled to room temperature unpack, namely obtain the high-speed steel roll of low interfacial failure after roughing, quenching, tempering heat treatment and polish. the roll metallurgical interface of present invention casting is combined, bond strength is high and outer layer not easily peels off. Chinese invention patent CN103014299 also discloses the electric pulse treating method improving high-speed steel roll heat treatment efficiency and liver mass, namely before Ageing Treatment, roll is carried out pulse current shock treatment after solution treatment, control current intensity, pulsewidth and frequency and can play the purpose promoting that carbide Quick uniform precipitates out, and reach to shorten Ageing Treatment number of times, time, and liver mass after heat treatment can be improved simultaneously, it is possible to reach qualified serviceability when using less alloy addition level. Chinese invention patent CN104087874 also discloses a kind of high-speed steel roll and preparation method thereof, this invention high-speed steel roll, its chemical composition is expressed as with mass percent: tungsten 2.00-3.20, chromium 3.00-2.00, carbon 1.00-1.20, silicon 0.60-1.00, molybdenum 0.50-0.80, vanadium 0.20-0.60, boron 0.20-0.60, silver 0.20-0.60, nitrogen 0.05-0.10, copper 0.20-0.60, rare earth 0.08-0.16, magnesium 0.04-0.10, titanium 0.04-0.10, potassium 0.10-0.20, sodium 0.08-0.16, tellurium 0.02-0.04, bismuth 0.02-0.04, surplus is ferrum and inevitable and content trace impurity below 0.01. this invention high speed steel roll material roll surface macrohardness has had qualitative leap, no matter its tensile strength, or its impact flexibility, is compared with prior art all greatly improved and improves. Chinese invention patent CN102828123 also discloses the method for a kind of centrifugal compound casting high-speed steel roll outer layer Metamorphism treatment, it is characterized in that, when the melting of layer high-speed steel completes to come out of the stove outside, in ladle, add composite modifier high-speed steel molten iron is carried out Metamorphism treatment, the addition of composite modifier is the 1.0��2.0% of Metal Weight, and reaction temperature is 1500��1600 DEG C. the chemical component weight percentage ratio of described composite modifier is: vanadium iron FeV5050��55%, rare earth ferrosilicon alloy FeSiRe2120��25%, Si-Ba alloy FeBa5Si6020��25%, Al5��10%. compared with prior art, the invention have the advantage that refinement casting crystal grain and improve chromium, carbide morphology, the tiny spherical MC type carbide of even dispersion distribution, improves the wear-resisting of high-speed steel roll outer layer and thermostability, makes roll millimeter stocking increase by 25%��30% on year-on-year basis. Chinese invention patent CN103624240 also discloses the method for centrifugal casting high boron high-speed steel roll under the electric field compound action of magnetic field. in high boron high-speed steel roll centrifugal casting process, fixing steady magnetic field is disposed outside mold, make the magnetic induction in casting mold centre at 0.01-0.7T, simultaneously, be respectively mounted at mold two ends conducting ring and and electrode contact, the foundry goods being in process of setting is passed into pulse current by spun casting process, the voltage of pulse current is 100V-1500V, frequency 10-20Hz, pulse width is at 15-25 �� s, the electromagnetic oscillation effect that in the concussion of impulse electric field and magnetic field, charged rotation foundry goods is formed is utilized to change the form precipitating out hard phase in high boron high-speed steel roll process of setting, and utilize the effect of centrifugal casting to control the distribution of hard phase.The present invention combines the technical advantage of impulse electric field, the casting of magneto-electric coupled and centrifugal rotation, can significantly improve the solidified inside tissue of high boron high-speed steel roll, increase substantially life-span and the serviceability of roll. Chinese invention patent CN102615108 also discloses a kind of centrifugal casting quick-cutting steel composite roller and manufacture method thereof, and composite roll is formed by centrifugal compound by outer layer high-speed steel, intermediate layer graphitic steel and core hi-strength nodular iron. This invention is on existing high carbon and vanadium high speed steel roll basis, suitably reduces content of vanadium, is simultaneously introduced niobium element, and Nb/V controls at 0.3-0.5, Nb is made to become double carbide (V, Nb) C with V-arrangement, thus avoiding formation segregation under centrifugal action. The roller core of compound high speed steel roll adopts high-strength ductile cast iron, is mixed into Cr, B etc. with the fusion of outer layer high-speed steel and causes the element of embrittlement, pour into a mould polynary graphitic steel intermediate layer between outer layer and roller core during for preventing from pouring into a mould magnesium iron. For preventing from crackle occurs in roll centrifugal casting process, roll surface high speed steel material and intermediate layer graphitic steel are carried out the microalloy treatment of thinning microstructure, reach to improve the purpose of roll material thermal crack resistant ability.
But, it is poor that above-mentioned high-speed steel roll still suffers from roll surface uniformity of hardness, and body of roll working lining hardness declines substantially and deficiency easy to crack in work roll cooling.
Summary of the invention
For the deficiencies in the prior art overcoming high-speed steel roll to exist, the present invention is improving on skin of the roll high-speed steel smelting molten steel Process ba-sis, in conjunction with the improvement of roller quenching Technology for Heating Processing, it is achieved increasing substantially of high-speed steel roll performance. The present invention can be realized by following processing step.
A kind of wear-resistant high speed steel composite roll and preparation method thereof, it is characterised in that comprise the following steps:
1. in medium-frequency induction furnace, first melt the compound high speed steel roll body of roll namely refer to the working portion of roll, the chemical composition of body of roll molten steel and mass fraction thereof control 1.5-2.4%C, 3.5-6.0%Cr, 3.5-6.0%Mo, 3.5-6.0%V, 1.5-3.5%W, 0.6-1.2%Nb, 0.5-1.2%Ni, 0.3-0.8%Si, 0.3-0.8%Mn, S < 0.04%, P < 0.04%, surplus Fe;
2. when step body of roll liquid steel temperature 1. reaches 1620-1650 DEG C, being come out of the stove to by molten steel ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction of polybasic aluminum ferroalloy deoxidant: 40.0-44.0%Al, < 0.35%C, 2.0-3.0%Si, 2.5-3.0%Mn, 4.0-4.5%Ca, 2.5-3.0%Ba, < 0.02%S, < 0.03%P, surplus Fe; Polybasic aluminum ferroalloy deoxidant addition accounts for and enters the 0.35-0.50% of body of roll steel quality in ladle; Molten steel is after deoxidation and skimming, and molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 6.0-8.5mm in ladle, and polynary microalloy line addition accounts for the 0.75-0.90% of steel quality in ladle, the chemical composition mass fraction of polynary microalloy line: 10-15%Ti, 6-8%V, 8-10%N, 2.5-3.5%Mg, 6-8%%Ce, 1.8-2.2%Zn, 2.5-3.5%Zr, 1.5-2.0%Ta, < 0.02%S, < 0.03%P, surplus Fe;
3. when the liquid steel temperature after step Metamorphism treatment 2. is down to 1430-1480 DEG C, poured in the mold on the centrifuge that rotating speed is 500-1000 rev/min, after molten steel rotates 10-15 minute on centrifuge, roll barrel internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, pour into a mould the molten ductile cast iron of roller core in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.5-3.9%C, 2.1-2.4%Si, 0.3-0.6%Mn, 0.04-0.07%Mg, 0.25-0.35%Ni, 0.02-0.04%Sb, S < 0.008%, P < 0.030%, surplus Fe, molten ductile cast iron pouring temperature is 1320-1350 DEG C, after molten ductile cast iron is poured 12-24 hour, takes out compound high speed steel roll and enters burial pit, then carry out roughing,
4. the compound high speed steel roll after roughing heats to 1050-1080 DEG C with stove, come out of the stove after being incubated 4-10 hour air-cooled to temperature lower than 300 DEG C, continue to heat to 550-600 DEG C into stove, it is cooled to temperature lower than 200 DEG C with stove after being incubated 12-20 hour, continues to reheat in stove to 510-550 DEG C, after being incubated 12-20 hour, it is cooled to temperature lower than 150 DEG C with stove, come out of the stove air cooling to room temperature, is refined to given size and precision, wear-resistant high speed steel composite roll can be obtained.
Compound high speed steel roll body of roll high-speed steel molten steel of the present invention adopts medium-frequency induction furnace melting, and technique is simple, easy to operate, and easy control of components. The chemical composition of body of roll molten steel and mass fraction thereof control 1.5-2.4%C, 3.5-6.0%Cr, 3.5-6.0%Mo, 3.5-6.0%V, 1.5-3.5%W, 0.6-1.2%Nb, 0.5-1.2%Ni, 0.3-0.8%Si, 0.3-0.8%Mn, S < 0.04%, P < 0.04%, surplus Fe. Wherein add 3.5-6.0%V and 0.6-1.2%Nb and be primarily to the MC type carbide obtaining high rigidity, be conducive to improving hardness and the wearability of roll barrel. It is additionally added 3.5-6.0%Mo and 1.5-3.5%W on this basis, is primarily to the red hardness improving roll, it is ensured that there is under hot environment the wearability of excellence. Add 3.5-6.0%Cr and can improve roll quenching degree and antioxygenic property. Nickel is non-carbide former, is mainly solid-solution in matrix, improves matrix quenching degree and heat resistance, adds 0.5-1.2%Ni, be conducive to roll to have good quenching degree and heat resistance in body of roll molten steel of the present invention. In addition, adding 1.5-2.4%C, wherein part carbon is solid-solution in matrix and can improve matrix hardenability, and part carbon is combined with alloying element, the alloy carbide of high rigidity can be generated, can increasing substantially roll barrel wearability, carbon addition is too much, and the carbide quantity of generation is many, size is big, causing that roll strength decline fragility increases, easy roll breakage and peeling in work roll cooling, suitable carbon addition is 1.5-2.4%C.
But containing more oxygen and field trash in above-mentioned high-speed steel molten steel, cause that roll barrel fragility is big, thermal fatigue resistance declines, the present invention is when body of roll liquid steel temperature reaches 1620-1650 DEG C, molten steel is come out of the stove to ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction %:40.0-44.0%Al of polybasic aluminum ferroalloy deoxidant, < 0.35%C, 2.0-3.0%Si, 2.5-3.0%Mn, 4.0-4.5%Ca, 2.5-3.0%Ba, < 0.02%S, < 0.03%P, surplus Fe, polybasic aluminum ferroalloy deoxidant addition accounts for and enters the 0.35-0.50% of body of roll steel quality mark in ladle, the oxygen content in body of roll molten steel can be made to be down to below 10ppm, guarantee that roll barrel has the thermal fatigue resistance of excellence. additionally, containing more alloy carbide in the high-speed steel roll body of roll, size is big, and skewness, and partially carbonized thing is continuous distribution, causes that roll barrel intensity is low, and poor toughness is easily peeled off in work roll cooling process, reduced the wearability of roll. the present invention at molten steel after deoxidation and skimming, molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 6.0-8.5mm in ladle, polynary microalloy line addition accounts for the 0.75-0.90% of steel quality mark in ladle, the chemical composition mass fraction of polynary microalloy line: 10-15%Ti, 6-8%V, 8-10%N, 2.5-3.5%Mg, 6-8%Ce, 1.8-2.2%Zn, 2.5-3.5%Zr, 1.5-2.0%Ta, < 0.02%S, < 0.03%P, surplus Fe, so can promote refinement and the distribution uniformity of alloy carbide, and to make carbide be isolated distribution, increase substantially the obdurability of roll barrel.
When the liquid steel temperature after deoxidation and composite inoculating is down to 1430-1480 DEG C, poured in the mold on the centrifuge that rotating speed is 500-1000 rev/min, after body of roll molten steel rotates 10-15 minute on centrifuge, roll barrel internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, direct casting roller core molten ductile cast iron in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.5-3.9%C, 2.1-2.4%Si, 0.3-0.6%Mn, 0.04-0.07%Mg, 0.25-0.35%Ni, 0.02-0.04%Sb, S < 0.008%, P < 0.030%, surplus Fe, molten ductile cast iron pouring temperature is 1320-1350 DEG C, so can ensure that the body of roll and roller core realize good metallurgical binding. after complete 12-24 hour of roller core molten iron casting, take out compound high speed steel roll and enter burial pit, then carry out roughing, it is possible to prevent roll from because cooling down too fast, CRACKING ACCIDENT occurring.
Compound high speed steel roll after roughing heats to 1050-1080 DEG C with stove, comes out of the stove air-cooled, it can be ensured that obtain martensitic matrix and the partial austenitic matrix of high rigidity after roller quenching, do not have the pearlitic structrure of soft after being incubated 4-10 hour. Air-cooled to temperature lower than 300 DEG C, continue to heat to 550-600 DEG C into stove, after being incubated 12-20 hour, stove is cooled to temperature lower than 200 DEG C, continue to reheat in stove to 510-550 DEG C, after being incubated 12-20 hour, stove is cooled to temperature lower than 150 DEG C of air coolings of coming out of the stove, it is possible to eliminate roll stress, stabilizing tissue, it is ensured that roll has the wearability of excellence.
The present invention compared with prior art, has the advantage that
1) the compound high speed steel roll body of roll of the present invention is after polybasic aluminum ferroalloy deoxidant processes, and oxygen content is down to below 10ppm, it is ensured that roll barrel has the thermal fatigue resistance of excellence.
2) the compound high speed steel roll body of roll of the present invention is after polynary microalloy line oven exomorphism processes, refinement and the distribution uniformity of alloy carbide can be promoted, and to make carbide be isolated distribution, increase substantially the obdurability of roll barrel, roll barrel hardness reaches 82-88HSD, and impact flexibility is more than 12J/cm2, tensile strength is more than 700MPa.
3) compound high speed steel roll of the present invention has the wearability of excellence, and service life improves more than 5 times than high Ni-Cr infinite cold hardness cast iron roll, and popularization and application have good economic and social benefit.
Accompanying drawing explanation
Fig. 1 compound high speed steel roll schematic diagram;
The 1-body of roll (high-speed steel), 2-roller core (spheroidal graphite cast-iron).
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:
A kind of wear-resistant high speed steel composite roll and preparation method thereof, integral by centrifugal composite casting by the body of roll 1 high-speed steel and roller core 2 spheroidal graphite cast-iron, concrete step of preparation process is:
1. in 750 kilograms of medium-frequency induction furnaces, first melt the compound high speed steel roll body of roll 1 namely refer to the working portion of roll, the chemical composition of the body of roll 1 molten steel and mass fraction thereof control at 1.52%C, 5.88%Cr, 3.53%Mo, 3.51%V, 3.44%W, 1.19%Nb, 0.55%Ni, 0.47%Si, 0.75%Mn, 0.028%S, 0.031%P, surplus Fe;
2. when the step body of roll 1 liquid steel temperature 1. reaches 1621 DEG C, molten steel is come out of the stove to ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction of polybasic aluminum ferroalloy deoxidant: 40.50%Al, 0.21%C, 2.99%Si, 2.52%Mn, 4.07%Ca, 2.94%Ba, 0.008%S, 0.016%P, surplus Fe, polybasic aluminum ferroalloy deoxidant addition accounts for and enters in ladle the 0.35% of the body of roll 1 steel quality mark, molten steel is after deoxidation and skimming, molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 8.5mm in ladle, polynary microalloy line addition accounts in ladle the 0.90% of steel quality mark, the chemical composition mass fraction of polynary microalloy line: 10.27%Ti, 7.78%V, 8.27%N, 2.56%Mg, 7.73%Ce, 1.81%Zn, 3.49%Zr, 1.56%Ta, 0.015%S, 0.020%P, surplus Fe,
3. when step liquid steel temperature 2. is down to 1435 DEG C, poured in the mold on the centrifuge that rotating speed is 500 revs/min, after the body of roll 1 molten steel rotates 15 minutes on centrifuge, roll barrel 1 internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, direct casting roller core 2 molten ductile cast iron in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.58%C, 2.37%Si, 0.36%Mn, 0.045%Mg, 0.34%Ni, 0.025%Sb, 0.005%S, 0.021%P, surplus Fe, molten ductile cast iron pouring temperature is 1326 DEG C, after complete 24 hours of roller core 2 molten iron casting, take out compound high speed steel roll and enter burial pit, then roughing is carried out,
4. the compound high speed steel roll after roughing heats to 1060 DEG C with stove, come out of the stove after being incubated 10 hours air-cooled to temperature lower than 300 DEG C, continue to heat to 550 DEG C into stove, after being incubated 20 hours, stove is cooled to temperature lower than 200 DEG C, continues to reheat in stove to 550 DEG C, after being incubated 12 hours, stove is cooled to temperature lower than 150 DEG C, come out of the stove air cooling to room temperature, is refined to given size and precision, wear-resistant high speed steel composite roll can be obtained. Its mechanical property is in Table 1.
Embodiment 2:
A kind of wear-resistant high speed steel composite roll and preparation method thereof, integral by centrifugal composite casting by the body of roll 1 high-speed steel and roller core 2 spheroidal graphite cast-iron, concrete step of preparation process is:
1. in 500 kilograms of medium-frequency induction furnaces, first melt the compound high speed steel roll body of roll 1 namely refer to the working portion of roll, the chemical composition of the body of roll 1 molten steel and mass fraction thereof control at 2.36%C, 3.51%Cr, 5.85%Mo, 5.96%V, 1.57%W, 0.67%Nb, 1.19%Ni, 0.78%Si, 0.31%Mn, 0.024%S, 0.028%P, surplus Fe;
2. when the step body of roll 1 liquid steel temperature 1. reaches 1647 DEG C, molten steel is come out of the stove to ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction of polybasic aluminum ferroalloy deoxidant: 43.89%Al, 0.20%C, 2.07%Si, 2.92%Mn, 4.46%Ca, 2.51%Ba, 0.015%S, 0.022%P, surplus Fe, polybasic aluminum ferroalloy deoxidant addition accounts for and enters in ladle the 0.50% of the body of roll 1 steel quality mark, molten steel is after deoxidation and skimming, molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 6.0mm in ladle, polynary microalloy line addition accounts in ladle the 0.75% of steel quality mark, the chemical composition mass fraction of polynary microalloy line: 14.80%Ti, 6.31%V, 9.86%N, 3.37%Mg, 6.05%Ce, 2.17%Zn, 2.51%Zr, 1.94%Ta, 0.009%S, 0.015%P, surplus Fe,
3. when step liquid steel temperature 2. is down to 1476 DEG C, poured in the mold on the centrifuge that rotating speed is 1000 revs/min, after the body of roll 1 molten steel rotates 10 minutes on centrifuge, roll barrel 1 internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, direct casting roller core 2 molten ductile cast iron in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.88%C, 2.13%Si, 0.57%Mn, 0.063%Mg, 0.29%Ni, 0.032%Sb, 0.007%S, 0.025%P, surplus Fe, molten ductile cast iron pouring temperature is 1349 DEG C, after complete 12 hours of roller core 2 molten iron casting, take out compound high speed steel roll and enter burial pit, then roughing is carried out,
4. the compound high speed steel roll after roughing heats to 1080 DEG C with stove, come out of the stove after being incubated 6 hours air-cooled to temperature lower than 300 DEG C, continue to heat to 600 DEG C into stove, after being incubated 12 hours, stove is cooled to temperature lower than 200 DEG C, continues to reheat in stove to 510 DEG C, after being incubated 20 hours, stove is cooled to temperature lower than 150 DEG C, come out of the stove air cooling to room temperature, is refined to given size and precision, wear-resistant high speed steel composite roll can be obtained. Its mechanical property is in Table 1.
Embodiment 3:
A kind of wear-resistant high speed steel composite roll and preparation method thereof, integral by centrifugal composite casting by the body of roll 1 high-speed steel and roller core 2 spheroidal graphite cast-iron, concrete step of preparation process is:
1. in 1000 kilograms of medium-frequency induction furnaces, first melt the compound high speed steel roll body of roll 1 namely refer to the working portion of roll, the chemical composition of the body of roll 1 molten steel and mass fraction thereof control at 1.89%C, 4.74%Cr, 5.08%Mo, 5.22%V, 2.60%W, 0.84%Nb, 0.79%Ni, 0.66%Si, 0.42%Mn, 0.014%S, 0.026%P, surplus Fe;
2. when the step body of roll 1 liquid steel temperature 1. reaches 1639 DEG C, molten steel is come out of the stove to ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction of polybasic aluminum ferroalloy deoxidant: 42.37%Al, 0.31%C, 2.58%Si, 2.91%Mn, 4.35%Ca, 2.88%Ba, 0.011%S, 0.018%P, surplus Fe, polybasic aluminum ferroalloy deoxidant addition accounts for and enters in ladle the 0.45% of the body of roll 1 steel quality mark, molten steel is after deoxidation and skimming, molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 6.0mm in ladle, polynary microalloy line addition accounts in ladle the 0.85% of steel quality mark, the chemical composition mass fraction of polynary microalloy line: 13.69%Ti, 6.95%V, 9.27%N, 2.91%Mg, 6.83%Ce, 1.99%Zn, 2.80%Zr, 1.82%Ta, 0.018%S, 0.025%P, surplus Fe,
3. when step liquid steel temperature 2. is down to 1458 DEG C, poured in the mold on the centrifuge that rotating speed is 850 revs/min, after the body of roll 1 molten steel rotates 12 minutes on centrifuge, roll barrel 1 internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, direct casting roller core 2 molten ductile cast iron in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.77%C, 2.30%Si, 0.52%Mn, 0.054%Mg, 0.26%Ni, 0.037%Sb, 0.006%S, 0.020%P, surplus Fe, molten ductile cast iron pouring temperature is 1337 DEG C, after complete 18 hours of roller core 2 molten iron casting, take out compound high speed steel roll and enter burial pit, then roughing is carried out,
4. the compound high speed steel roll after roughing heats to 1050 DEG C with stove, come out of the stove after being incubated 10 hours air-cooled to temperature lower than 300 DEG C, continue to heat to 580 DEG C into stove, after being incubated 16 hours, stove is cooled to temperature lower than 200 DEG C, continues to reheat in stove to 520 DEG C, after being incubated 18 hours, stove is cooled to temperature lower than 150 DEG C, come out of the stove air cooling to room temperature, is refined to given size and precision, wear-resistant high speed steel composite roll can be obtained. Its mechanical property is in Table 1.
Table 1 compound high speed steel roll body of roll mechanical property
The compound high speed steel roll body of roll of the present invention is after polybasic aluminum ferroalloy deoxidant processes, and oxygen content is down to below 10ppm, it is ensured that roll barrel has the thermal fatigue resistance of excellence. The compound high speed steel roll body of roll of the present invention is after polynary microalloy line oven exomorphism processes, can promote refinement and the distribution uniformity of alloy carbide, and to make carbide be isolated distribution, increase substantially the obdurability of roll barrel, roll barrel hardness reaches 82-88HSD, and impact flexibility is more than 12J/cm2, tensile strength is more than 700MPa. Compound high speed steel roll of the present invention has the wearability of excellence, uses on bar mill, and during rolled threaded steel, its service life improves more than 5 times than high Ni-Cr infinite cold hardness cast iron roll. Using high-speed steel roll of the present invention, groove even wearing, occur without flake-off block phenomenon, can improving roller surface quality and dimensional accuracy, extension device production operational availability, alleviate labor strength, popularization and application have good economic and social benefit.

Claims (2)

1. the preparation method of a wear-resistant high speed steel composite roll, it is characterised in that comprise the following steps:
1. in medium-frequency induction furnace, first melt the compound high speed steel roll body of roll namely refer to the working portion of roll, the chemical composition of body of roll molten steel and mass fraction thereof control 1.5-2.4%C, 3.5-6.0%Cr, 3.5-6.0%Mo, 3.5-6.0%V, 1.5-3.5%W, 0.6-1.2%Nb, 0.5-1.2%Ni, 0.3-0.8%Si, 0.3-0.8%Mn, S < 0.04%, P < 0.04%, surplus Fe;
2. when step body of roll liquid steel temperature 1. reaches 1620-1650 DEG C, being come out of the stove to by molten steel ladle, ladle bottom has been previously added polybasic aluminum ferroalloy deoxidant, the chemical composition mass fraction of polybasic aluminum ferroalloy deoxidant: 40.0-44.0%Al, < 0.35%C, 2.0-3.0%Si, 2.5-3.0%Mn, 4.0-4.5%Ca, 2.5-3.0%Ba, < 0.02%S, < 0.03%P, surplus Fe; Polybasic aluminum ferroalloy deoxidant addition accounts for and enters the 0.35-0.50% of body of roll steel quality in ladle; Molten steel is after deoxidation and skimming, and molten steel is carried out stove exomorphism process by the polynary microalloy line continuing to add diameter �� 6.0-8.5mm in ladle, and polynary microalloy line addition accounts for the 0.75-0.90% of steel quality in ladle, the chemical composition mass fraction of polynary microalloy line: 10-15%Ti, 6-8%V, 8-10%N, 2.5-3.5%Mg, 6-8%%Ce, 1.8-2.2%Zn, 2.5-3.5%Zr, 1.5-2.0%Ta, < 0.02%S, < 0.03%P, surplus Fe;
3. when the liquid steel temperature after step Metamorphism treatment 2. is down to 1430-1480 DEG C, poured in the mold on the centrifuge that rotating speed is 500-1000 rev/min, after molten steel rotates 10-15 minute on centrifuge, roll barrel internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200-1260 DEG C, pour into a mould the molten ductile cast iron of roller core in the quiescent state, the chemical composition mass fraction of molten ductile cast iron: 3.5-3.9%C, 2.1-2.4%Si, 0.3-0.6%Mn, 0.04-0.07%Mg, 0.25-0.35%Ni, 0.02-0.04%Sb, S < 0.008%, P < 0.030%, surplus Fe, molten ductile cast iron pouring temperature is 1320-1350 DEG C, after molten ductile cast iron is poured 12-24 hour, takes out compound high speed steel roll and enters burial pit, then carry out roughing,
4. the compound high speed steel roll after roughing heats to 1050-1080 DEG C with stove, come out of the stove after being incubated 4-10 hour air-cooled to temperature lower than 300 DEG C, continue to heat to 550-600 DEG C into stove, it is cooled to temperature lower than 200 DEG C with stove after being incubated 12-20 hour, continues to reheat in stove to 510-550 DEG C, after being incubated 12-20 hour, it is cooled to temperature lower than 150 DEG C with stove, come out of the stove air cooling to room temperature, is refined to given size and precision, wear-resistant high speed steel composite roll can be obtained.
2. a kind of wear-resistant high speed steel composite roll prepared according to the method for claim 1.
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