CN104001905A - Abrasion-resistance casting high-speed steel composite roller and manufacturing method thereof - Google Patents
Abrasion-resistance casting high-speed steel composite roller and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an abrasion-resistance casting high-speed steel composite roller and a manufacturing method thereof and belongs to the technical field of steel rolling. The abrasion-resistance casting high-speed steel composite roller is formed by roller body abrasion-resistance high-speed steel and roller core high-intensity ball iron in a centrifugal-casting-composite mode. The roller body abrasion-resistance high-speed steel is subjected to processing of nickel-magnesium alloy and multi-element alloy wires. After air-blast quenching and high-temperature tempering, the high-speed steel composite roller has the advantages of being high in hardness, good in hardness evenness, good in roller core toughness and the like, and the high-speed steel composite roller has good using effect on a hot mill.
Description
Technical field
The invention discloses a kind of composite roll and preparation method thereof, particularly a kind of abrasion-resistant cast compound high speed steel roll and preparation method thereof, belongs to technical field of steel rolling.
Background technology
Roll is the important consumable tool during steel rolling is produced, development along with steel rolling technology, the performance of breaker roll, particularly wear resistance at elevated temperature is had higher requirement, in order to improve roll high temperature abrasion resistance, most important approach is in roll material, to add to form high rigidity carbide element and add to improve the anti-temper resistance element of matrix, and wherein modal is to add the alloying elements such as tungsten, molybdenum, vanadium, niobium, has occurred thus high speed steel roll material.
High-speed steel roll is applied widely in steel rolling is produced at present, and in order further to improve high-speed steel roll performance, Chinese invention patent CN103624230A discloses a kind of outer method of Centrifugal Cast High Speed Steel Roll after the match that combines.In high-speed steel roll rotating centrifugal casting process, set pulse formula magnetic field outside mold, the frequency 10-20Hz in pulsed magnetic field, pulse width is at 15-25 μ s, make the magnetic induction intensity in casting mold centre at 0.01-0.7T, meanwhile, an electrode is installed respectively at mold two ends, in spun casting process, the metal in process of setting is passed into galvanic current stream, the current density of DC current is 0.1-10A/m
2, utilize the reciprocation of DC current in pulsed magnetic field and High Rotation Speed mold inner metal liquid to change in high-speed steel roll process of setting and separate out the form of hard phase, and utilize the effect of centrifugal casting to control the distribution of hard phase.This invention combines the technical advantage of pulsed magnetic field, the casting of magneto-electric coupled and centrifugal rotation, can significantly improve the solidified inside tissue of high-speed steel roll, increases substantially life-span and the serviceability of roll.Chinese invention patent CN103624240A 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, outside mold, settle fixing steady magnetic field, make the magnetic induction intensity in casting mold centre at 0.01-0.7T, simultaneously, at mold two ends, install respectively conducting ring and and electrode contact, in spun casting process, the foundry goods in process of setting is passed into pulse current, the voltage of pulse current is 100V-1500V, frequency 10-20Hz, pulse width is at 15-25 μ s, utilize the electromagnetic oscillation effect that in the concussion of impulse electric field and magnetic field, charged rotation foundry goods forms to change the form of separating out hard phase in high boron high-speed steel roll process of setting, and the distribution of hard phase is controlled in the effect that utilizes centrifugal casting.This 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, increases substantially life-span and the serviceability of roll.Chinese invention patent CN103317115A also discloses a kind of manufacture method of compound high speed steel roll, comprises the following steps: the composition of the high-speed steel roll of melting requires that raw material is placed in to intermediate frequency furnace and carries out melting as required; Process stokehold; Adopt three layers of compound and centrifuging process cast roll; Roughing; Heat treatment; Fine finishining; Wherein, described melting comprises that outer molten steel is smelted, metallic intermediate layer liquid melts and core molten iron is melting, described heat treatment comprises quenches and tempering process, and described tempering process is 400-450 ℃ of insulation 10-15 hour, then the air cooling of coming out of the stove after below cooling to 100 ℃ with the furnace.By the way, this invention can solve the problem that is difficult to combination between skin and core unlike material, realizes the transition combination in intermediate layer, has fabulous wearability and higher hardness, can guarantee roll surface quality.Chinese invention patent CN103305775A also discloses a kind of high carbon high speed steel roll, comprise the following ingredients forming by mass percentage: C:1.8-2.8%, W:3-5%, Cr:5-8%, Mo:3.5-4%, V:4-6%, Nb:0.8-1.5%, Co:1-3%, Ni:0.5-1.5%, Al:0.3-0.6%, Si :≤1.0%, all the other are Fe and inevitably micro-.By the way, the high carbon high speed steel roll of this invention can improve wear-resistant and thermal fatigue resistance, is applied on bar mill finishing stand, can significantly improve rolling mill operating rate, reduce stocking production cost, alleviate labor strength, improve service life.Chinese invention patent CN102828123A also discloses a kind of outer rotten method of processing of centrifugal compound casting high-speed steel roll, it is characterized in that, layer high-speed steel melting outside completes while coming out of the stove, to adding in ladle composite modifier to the processing of going bad of high-speed steel molten iron, the addition of composite modifier is 1.0～2.0% of Metal Weight, and reaction temperature is 1500～1600 ℃.The chemical component weight percentage of described composite modifier is: 50～55% vanadium iron FeV50,20～25% rare earth ferrosilicon alloy FeSiRe21,20～25% Si-Ba alloy FeBa5Si60,5～10%Al.Compared with prior art, the advantage of this invention is: refinement is cast crystal grain and improved chromium, carbide morphology, the tiny spherical MC type carbide that even dispersion distributes, has improved the outer field wear-resisting and heat resistance of high-speed steel roll, makes roll millimeter stocking increase on year-on-year basis 25～30%.Chinese invention patent CN102615108B 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 high-speed steel, intermediate layer graphitic steel and core hi-strength nodular iron.The present invention is on existing high carbon and vanadium high speed steel roll basis, suitably reduces content of vanadium, adds niobium element simultaneously, and Nb/V is controlled at 0.3-0.5, makes Nb become double carbide (V, Nb) C with V-arrangement, thereby has avoided forming segregation under centrifugal action.The roller core of compound high speed steel roll adopts high-strength ductile cast iron, fuses and sneaks into Cr when preventing from pouring into a mould magnesium iron with outer high-speed steel, and B etc. cause the element of embrittlement, pour into a mould polynary graphitic steel intermediate layer between skin and roller core.For preventing occurring crackle in roll centrifugal casting process, roll surface high speed steel material and intermediate layer graphitic steel are carried out to the microalloy treatment of thinning microstructure, reach the object that improves roll material thermal crack resistant ability.Chinese invention patent CN102366822A also discloses a kind of steel treatment method of high speed steel roll material, by alterant element rare earth magnesium ferrosilicon alloy, vanadium iron, ferrotianium, ferro-niobium, ferrozirconium, potassium oxide, calsibar alloy, be broken into 60～100 object powder containing nitrogenous ferrochrome, ferro-boron and zinc, by mass fraction, mix; Adopt thickness 0.15～0.22mm mild steel steel band packing, be rolled into diameter phi 5-8mm metal cored wire; Adopt hello a silk method metal cored wire to be added in the molten steel of pouring into a mould high-speed steel roll in ladle, the addition of metal cored wire is 8～10kg/T molten steel.This invented technology is easy, and alterant element recovery rate is high, and modification effect is stable, causes the mechanical property of high-speed steel roll and serviceability obviously to improve.Chinese invention patent CN102274856A also discloses a kind of centrifugal compound high-speed steel roll and pouring procedure thereof, roll comprises high-speed steel skin, intermediate layer, spheroidal graphite cast-iron core, the outer field chemical component weight percentage of described high-speed steel is: 1.8～2.6%C, 3～10%Cr, 0.2～1.0%Nb, 4～10%Mo, 5～10%V, 4～10%W, 2～10%Co, all the other are Fe and inevitable impurity, and its job step is as follows: 1) intermediate frequency furnace melting; 2) processing of going bad; 3) centrifugal casting; 4) core casting; 5) adopt car-type differential temperature stove to heat-treat.Compared with prior art, this beneficial effect of the invention is: 1) can significantly improve the outer field thermal fatigue resistance of high-speed steel and anti-wear performance.2), more than high-speed steel bond strength outer and intermediate layer reaches 400MPa, prevent from that high-speed steel is outer field to peel off.Chinese invention patent CN101812646A also discloses the casting technique of High Speed Steel for Roller alloy, this technique first adopts fast quenching to get rid of band method and makes respectively laminar nanocrystalline rare-earth ferrosilicon inovulant and laminar nanocrystalline ferro-boron fining agent, use again the alterant breaker roll being formed by this nanocrystalline rare-earth ferrosilicon inovulant and nanocrystalline ferro-boron fining agent to carry out crystal grain with high-speed steel alloy tissue and structure refinement is processed, to overcome the defect of high-speed steel alloy casting, significantly refinement its matrix grain make carbide suspension, thereby improved significantly the comprehensive mechanical property of prepared high-speed steel roll.Chinese invention patent CN101078090 also discloses a kind of low-alloy high speed steel roll material and manufacture method, the chemical composition of its material is (% by weight): C:1.2～1.8%, Cr:4.5～6.5%, W:1.0～3.0%, Mo:1.0～3.0%, V:3.0～5.0%, Al:0.6～1.2%, Si:0.8～1.2%, N:0.05～0.15%, B:0.04～0.12%, Nb:0.05～0.20%, Ti:0.06～0.18%, Y:0.04～0.15%, Mn < 0.5%, P < 0.04%, S < 0.04%, surplus Fe, and actual carbon content is: 0.033W+0.063Mo+0.060Cr+0.200V+ (0.08～0.20).Manufacture electro-smelting, roll adopts centrifugal composite casting or composite casting moulding continuously, and roll quenches and temper after roughing, is finally refined to given size and precision.This low-alloy high speed steel roll material contains less tungsten, molybdenum alloy element, and or not containing expensive cobalt element, production cost is not low, has good red hardness, obdurability and wearability.Chinese invention patent CN1999804 also discloses a kind of novel high carbon high wolfram fast steel rolling roller and preparation method thereof, the high wolfram fast steel rolling roller of this invention medium high carbon contains: carbon 2.0～3.0%, tungsten 6.0～18.0%, vanadium 2.0～4.0%, molybdenum 1.0～3.0%, chromium 3.0～9.0%, silicon is less than 1.2%, and manganese is less than 1.2%; The MC type double carbide that this high carbon high wolfram fast steel rolling roller of making contains vanadium, tungsten system.The preparation method of the high wolfram fast steel rolling roller of this invention medium high carbon is, high carbon high wolfram fast steel rolling is heated to 1580～1620 ℃ after deoxidation; 1400～1500 ℃ of casting, centrifugal casting mould is applied the steady magnetic field of 0.05～0.25T simultaneously, and rotate to moulding with 600～1800 revs/min of rotating speeds.
But, above-mentioned high-speed steel roll ubiquity toughness is low, easily peel off, fall piece in use procedure, affects the normal use of milling train, while using in milling train mm finishing mill unit especially, also exist and wear no resistance, cause degradation deficiency under stocking surface quality variation and stocking dimensional accuracy.
Summary of the invention
The preparation method who the object of this invention is to provide a kind of casting wear-resistant high speed steel composite roll, wear-resistant high speed steel composite roll of the present invention is thick for traditional high-speed steel roll carbide size, and distribution of carbides is inhomogeneous, on traditional high carbon and vanadium high speed steel roll basis, by the improvement of optimizing components and smelting process and the outer treatment process of molten steel stove, reach the object of refinement carbide and raising high-speed steel roll combination property.
Object of the present invention can realize by following measures:
Abrasion-resistant cast compound high speed steel roll of the present invention is composited by centrifugal casting by body of roll wear-resistant high speed steel and roller core hi-strength nodular iron.The preparation technology of abrasion-resistant cast compound high speed steel roll of the present invention is as follows:
1. melting body of roll wear-resistant high speed steel and roller core hi-strength nodular iron in two medium-frequency induction furnaces respectively, wherein the smelting process of body of roll wear-resistant high speed steel is: first by steel scrap, carburant, ferrochrome, ferrotungsten, molybdenum-iron, vanadium iron and the fusing of ferro-niobium Hybrid Heating, when liquid steel temperature reaches 1570～1590 ℃, sample analysis, when steel quality mark reaches 1.8～2.2%C, 4.5～6.0%Cr, 1.5～2.2%W, 5.5～6.5%Mo, 4.8～5.6%V, 1.5～1.8%Nb, <1.0%Si, <0.6%Mn, <0.05%P, <0.04%S, when surplus is Fe and inevitable impurity, in molten steel, add the metallic aluminium that accounts for steel quality mark 0.5～0.8% in stove for component controlling, be incubated the ladle of after 4～6 minutes, molten steel being come out of the stove, at ladle bottom, placed in advance nickel magnesium alloy, nickel magnesium alloy addition accounts for injects 0.35～0.50% of the interior steel quality mark of ladle, finally, by wire feeder, in ladle, add multicomponent alloy silk, multicomponent alloy silk addition accounts for 3.0～3.5% of the interior steel quality mark of ladle, multicomponent alloy filament diameter
2. molten steel is after skimming, when temperature is down to 1430～1460 ℃, poured in the casting mold on the centrifuge of High Rotation Speed, after pouring molten steel, with contactless temperature-measuring instrument, measure high-speed steel body of roll internal layer temperature, when temperature is 1210～1290 ℃, pour into roller core molten ductile cast iron, chemical composition and the mass fraction thereof of roller core molten ductile cast iron are: 3.4～3.8%C, 2.1～2.4%Si, 0.10～0.35%Mn, 0.20～0.35%Ni, 0.04～0.06%Mg, 0.02～0.04%RE, 0.09～0.15%Na, S<0.02%, P<0.04%, surplus is Fe and inevitable impurity, molten ductile cast iron pouring temperature is 1310～1350 ℃, roller core molten ductile cast iron is poured after 12～24h, take out compound high speed steel roll and enter holding furnace or burial pit,
3. compound high speed steel roll is directly carried out under as cast condition to roughing, then in heating furnace, be heated to 1040～1070 ℃, heat temperature raising speed is 15～25 ℃/h, air-cooled after insulation 3～6h, programming rate with 25～35 ℃/h is heated to 520～550 ℃ again, and after insulation 8～12h, stove is chilled to below 150 ℃, air cooling, is finally refined to roll given size and precision.
The chemical composition of nickel magnesium alloy and mass fraction thereof are as mentioned above: 70～85%Ni, 15～30%Mg.
The chemical composition of multicomponent alloy silk and mass fraction thereof are as mentioned above: 10～12%V, 1.5～2.0%N, 3～5%Ti, 2.5～4.0%Ca, 6～8%Zr, 3～5%Ce, 25～28%Si, 10～12%Cr, 2～4%K, <0.04%P, <0.03%S, surplus is Fe and inevitable impurity.
Compound high speed steel roll of the present invention compared with prior art, has the following advantages:
1) compound high speed steel roll roll surface hardness of the present invention is high, and quenching degree is good, and hardened depth has guaranteed that roll all has fabulous wearability in whole working lining, and roll surface hardness of the present invention surpasses 85HSD, and roll surface difference of hardness is less than 1.5HSD;
2) compound high speed steel roll roller core intensity of the present invention is high, guarantees that roll there will not be roll breakage in using;
3) compound high speed steel roll anti-wear performance of the present invention is good, and improve more than 4 times than high Minvar roll its service life.
Accompanying drawing explanation
Fig. 1 roll schematic diagram of the present invention;
The 1-body of roll (wear-resistant high speed steel), 2-roller core (hi-strength nodular iron).
The specific embodiment
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to following examples.
Abrasion-resistant cast compound high speed steel roll of the present invention is composited by centrifugal casting by the body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons.
Embodiment 1:
The preparation technology of abrasion-resistant cast compound high speed steel roll of the present invention is as follows:
1. the melting body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons in two 1000 kilograms of medium-frequency induction furnaces respectively, wherein the smelting process of the body of roll 1 wear-resistant high speed steel is: first by steel scrap, carburant, ferrochrome, ferrotungsten, molybdenum-iron, vanadium iron and the fusing of ferro-niobium Hybrid Heating, when liquid steel temperature reaches 1571 ℃, sample analysis, when steel quality mark reaches 1.81%C, 4.63%Cr, 2.19%W, 5.51%Mo, 4.80%V, 1.77%Nb, 0.65%Si, 0.38%Mn, 0.039%P, 0.031%S, when surplus is Fe and inevitable impurity, in molten steel, add the metallic aluminium that accounts for steel quality mark 0.5% in stove for component controlling, be incubated the ladle of after 6 minutes, molten steel being come out of the stove, at ladle bottom, placed in advance nickel magnesium alloy, chemical composition and the mass fraction thereof of nickel magnesium alloy are: 85%Ni, 15%Mg, nickel magnesium alloy addition accounts for injects 0.50% of the interior steel quality mark of ladle, finally, by wire feeder, in ladle, add multicomponent alloy silk, chemical composition and the mass fraction thereof of multicomponent alloy silk are: 10.03%V, 1.57%N, 4.82%Ti, 2.57%Ca, 7.68%Zr, 3.02%Ce, 25.30%Si, 10.24%Cr, 2.85%K, 0.027%P, 0.019%S, surplus is Fe and inevitable impurity.Multicomponent alloy silk addition accounts for 3.0% of the interior steel quality mark of ladle, multicomponent alloy filament diameter
2. molten steel is after skimming, when temperature is down to 1435 ℃, poured in the casting mold on the centrifuge of High Rotation Speed, after pouring molten steel, with contactless temperature-measuring instrument, measure the high-speed steel body of roll 1 internal layer temperature, when temperature is 1238 ℃, pour into roller core 2 molten ductile cast irons, chemical composition and the mass fraction thereof of roller core 2 molten ductile cast irons are: 3.45%C, 2.38%Si, 0.27%Mn, 0.29%Ni, 0.044%Mg, 0.026%RE, 0.15%Na, 0.009%S, 0.031%P, surplus is Fe and inevitable impurity, molten ductile cast iron pouring temperature is 1347 ℃.Roller core 2 molten ductile cast irons are poured after 12h, take out compound high speed steel roll and enter holding furnace.
3. compound high speed steel roll is directly carried out under as cast condition to roughing, then in heating furnace, be heated to 1070 ℃, heat temperature raising speed is 25 ℃/h, air-cooled after insulation 3h, programming rate with 35 ℃/h is heated to 550 ℃ again, and after insulation 8h, stove is chilled to below 150 ℃, air cooling, is finally refined to roll given size and precision.Compound high speed steel roll mechanical property is in Table 1.
Embodiment 2:
Abrasion-resistant cast compound high speed steel roll of the present invention is composited by centrifugal casting by the body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons.The preparation technology of abrasion-resistant cast compound high speed steel roll of the present invention is as follows:
1. the melting body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons in two 1000 kilograms of medium-frequency induction furnaces respectively, wherein the smelting process of the body of roll 1 wear-resistant high speed steel is: first by steel scrap, carburant, ferrochrome, ferrotungsten, molybdenum-iron, vanadium iron and the fusing of ferro-niobium Hybrid Heating, when liquid steel temperature reaches 1588 ℃, sample analysis, when steel quality mark reaches 2.18%C, 5.94%Cr, 1.51%W, 6.45%Mo, 5.47%V, 1.51%Nb, 0.70%Si, 0.42%Mn, 0.044%P, 0.037%S, when surplus is Fe and inevitable impurity, in molten steel, add the metallic aluminium that accounts for steel quality mark 0.8% in stove for component controlling, be incubated the ladle of after 4 minutes, molten steel being come out of the stove, at ladle bottom, placed in advance nickel magnesium alloy, chemical composition and the mass fraction thereof of nickel magnesium alloy are: 70%Ni, 30%Mg, nickel magnesium alloy addition accounts for injects 0.35% of the interior steel quality mark of ladle, finally, by wire feeder, in ladle, add multicomponent alloy silk, chemical composition and the mass fraction thereof of multicomponent alloy silk are: 11.92%V, 1.98%N, 3.17%Ti, 3.86%Ca, 6.15%Zr, 4.85%Ce, 27.77%Si, 11.82%Cr, 3.93%K, 0.030%P, 0.017%S, surplus is Fe and inevitable impurity.Multicomponent alloy silk addition accounts for 3.5% of the interior steel quality mark of ladle, multicomponent alloy filament diameter
2. molten steel is after skimming, when temperature is down to 1456 ℃, poured in the casting mold on the centrifuge of High Rotation Speed, after pouring molten steel, with contactless temperature-measuring instrument, measure the high-speed steel body of roll 1 internal layer temperature, when temperature is 1281 ℃, pour into roller core 2 molten ductile cast irons, chemical composition and the mass fraction thereof of roller core 2 molten ductile cast irons are: 3.78%C, 2.13%Si, 0.19%Mn, 0.34%Ni, 0.053%Mg, 0.038%RE, 0.097%Na, 0.011%S, 0.028%P, surplus is Fe and inevitable impurity, molten ductile cast iron pouring temperature is 1314 ℃.Roller core 2 molten ductile cast irons are poured after 24h, take out compound high speed steel roll and enter burial pit.
3. compound high speed steel roll is directly carried out under as cast condition to roughing, then in heating furnace, be heated to 1040 ℃, heat temperature raising speed is 15 ℃/h, air-cooled after insulation 6h, programming rate with 25 ℃/h is heated to 520 ℃ again, and after insulation 12h, stove is chilled to below 150 ℃, air cooling, is finally refined to roll given size and precision.Compound high speed steel roll mechanical property is in Table 1.
Embodiment 3:
Abrasion-resistant cast compound high speed steel roll of the present invention is composited by centrifugal casting by the body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons.The preparation technology of abrasion-resistant cast compound high speed steel roll of the present invention is as follows:
1. the melting body of roll 1 wear-resistant high speed steel and roller core 2 hi-strength nodular irons in two 750 kilograms of medium-frequency induction furnaces respectively, wherein the smelting process of the body of roll 1 wear-resistant high speed steel is: first by steel scrap, carburant, ferrochrome, ferrotungsten, molybdenum-iron, vanadium iron and the fusing of ferro-niobium Hybrid Heating, when liquid steel temperature reaches 1583 ℃, sample analysis, when steel quality mark reaches 1.96%C, 5.28%Cr, 1.91%W, 5.94%Mo, 5.07%V, 1.68%Nb, 0.58%Si, 0.37%Mn, 0.041%P, 0.026%S, when surplus is Fe and inevitable impurity, in molten steel, add the metallic aluminium that accounts for steel quality mark 0.65% in stove for component controlling, be incubated the ladle of after 5 minutes, molten steel being come out of the stove, at ladle bottom, placed in advance nickel magnesium alloy, chemical composition and the mass fraction thereof of nickel magnesium alloy are: 70%Ni, 30%Mg, nickel magnesium alloy addition accounts for injects 0.40% of the interior steel quality mark of ladle, finally, by wire feeder, in ladle, add multicomponent alloy silk, chemical composition and the mass fraction thereof of multicomponent alloy silk are: 11.29%V, 1.80%N, 3.86%Ti, 2.90%Ca, 6.33%Zr, 3.92%Ce, 26.64%Si, 11.25%Cr, 2.08%K, 0.021%P, 0.013%S, surplus is Fe and inevitable impurity.Multicomponent alloy silk addition accounts for 3.2% of the interior steel quality mark of ladle, multicomponent alloy filament diameter
2. molten steel is after skimming, when temperature is down to 1447 ℃, poured in the casting mold on the centrifuge of High Rotation Speed, after pouring molten steel, with contactless temperature-measuring instrument, measure the high-speed steel body of roll 1 internal layer temperature, when temperature is 1253 ℃, pour into roller core 2 molten ductile cast irons, chemical composition and the mass fraction thereof of roller core 2 molten ductile cast irons are: 3.59%C, 2.24%Si, 0.33%Mn, 0.21%Ni, 0.048%Mg, 0.029%RE, 0.127%Na, 0.008%S, 0.029%P, surplus is Fe and inevitable impurity, molten ductile cast iron pouring temperature is 1330 ℃.Roller core 2 molten ductile cast irons are poured after 18h, take out compound high speed steel roll and enter burial pit.
3. compound high speed steel roll is directly carried out under as cast condition to roughing, then in heating furnace, be heated to 1050 ℃, heat temperature raising speed is 20 ℃/h, air-cooled after insulation 5h, programming rate with 30 ℃/h is heated to 540 ℃ again, and after insulation 10h, stove is chilled to below 150 ℃, air cooling, is finally refined to roll given size and precision.Compound high speed steel roll mechanical property is in Table 1.
Table 1 compound high speed steel roll mechanical property
Compound high speed steel roll roll surface hardness of the present invention is high, quenching degree is good, hardened depth, guaranteed that roll all has fabulous wearability in whole working lining, roll surface hardness of the present invention surpasses 85HSD, roll surface difference of hardness is less than 1.5HSD, and compound high speed steel roll roller core intensity of the present invention is high, guarantees that roll there will not be roll breakage in using.Roll of the present invention is for bar mill finishing stand and bar and shape mill finishing stand and high-speed rod-rolling mill pre-finishing mill frame, all show excellent wearability, compound high speed steel roll of the present invention improves more than 4 times than high Minvar roll service life, apply and can alleviate labor strength, reduce stocking cost, improve stocking surface quality, and can improve operating rate of rolling mill, apply and there is good economic and social benefit.
Claims (4)
1. a preparation method for abrasion-resistant cast compound high speed steel roll, is characterized in that, by body of roll wear-resistant high speed steel and roller core hi-strength nodular iron, by centrifugal casting, is composited, and comprises the following steps:
1. melting body of roll wear-resistant high speed steel and roller core hi-strength nodular iron in two medium-frequency induction furnaces respectively, wherein the smelting process of body of roll wear-resistant high speed steel is: first by steel scrap, carburant, ferrochrome, ferrotungsten, molybdenum-iron, vanadium iron and the fusing of ferro-niobium Hybrid Heating, when liquid steel temperature reaches 1570～1590 ℃, sample analysis, when steel quality mark reaches 1.8～2.2%C, 4.5～6.0%Cr, 1.5～2.2%W, 5.5～6.5%Mo, 4.8～5.6%V, 1.5～1.8%Nb, <1.0%Si, <0.6%Mn, <0.05%P, <0.04%S, when surplus is Fe and inevitable impurity, in molten steel, add the metallic aluminium that accounts for steel quality mark 0.5～0.8% in stove for component controlling, be incubated the ladle of after 4～6 minutes, molten steel being come out of the stove, at ladle bottom, placed in advance nickel magnesium alloy, nickel magnesium alloy addition accounts for injects 0.35～0.50% of the interior steel quality mark of ladle, finally, by wire feeder, in ladle, add multicomponent alloy silk, multicomponent alloy silk addition accounts for 3.0～3.5% of the interior steel quality mark of ladle, multicomponent alloy filament diameter
2. molten steel is after skimming, when temperature is down to 1430～1460 ℃, poured in the casting mold on the centrifuge of High Rotation Speed, after pouring molten steel, with contactless temperature-measuring instrument, measure high-speed steel body of roll internal layer temperature, when temperature is 1210～1290 ℃, pour into roller core molten ductile cast iron, chemical composition and the mass fraction thereof of roller core molten ductile cast iron are: 3.4～3.8%C, 2.1～2.4%Si, 0.10～0.35%Mn, 0.20～0.35%Ni, 0.04～0.06%Mg, 0.02～0.04%RE, 0.09～0.15%Na, S<0.02%, P<0.04%, surplus is Fe and inevitable impurity, molten ductile cast iron pouring temperature is 1310～1350 ℃, roller core molten ductile cast iron is poured after 12～24h, take out compound high speed steel roll and enter holding furnace or burial pit,
3. compound high speed steel roll is directly carried out under as cast condition to roughing, then in heating furnace, be heated to 1040～1070 ℃, heat temperature raising speed is 15～25 ℃/h, air-cooled after insulation 3～6h, programming rate with 25～35 ℃/h is heated to 520～550 ℃ again, and after insulation 8～12h, stove is chilled to below 150 ℃, air cooling, is finally refined to roll given size and precision.
2. according to the method for claim 1, it is characterized in that, chemical composition and the mass fraction thereof of nickel magnesium alloy are: 70～85%Ni, 15～30%Mg.
3. according to the method for claim 1, it is characterized in that, chemical composition and the mass fraction thereof of multicomponent alloy silk are: 10～12%V, 1.5～2.0%N, 3～5%Ti, 2.5～4.0%Ca, 6～8%Zr, 3～5%Ce, 25～28%Si, 10～12%Cr, 2～4%K, <0.04%P, <0.03%S, surplus is Fe and inevitable impurity.
4. the abrasion-resistant cast compound high speed steel roll preparing according to the either method of claim 1-3.
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