CN104264043A - Wear-resisting and high-speed centrifugally cast steel composite roll and preparation method thereof - Google Patents
Wear-resisting and high-speed centrifugally cast steel composite roll and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a wear-resisting and high-speed centrifugally cast steel composite roll and a preparation method thereof, and belongs to the technical field of roll manufacturing. The roll is integrally composited by three parts of an outer layer, a middle layer and a roll core, wherein the mass percentages of chemical components of high-speed molten steel on the outer layer are controlled as follows: 1.60%-2.40% of C, 0.3%-1.0% of Mn, 0.3%-1.2% of Si, 4.0%-6.5% of Cr, 4.0%-6.5% of Mo, 3.0%-6.5% of V, 3.0%-5.0% of W, 1.0%-4.0% of Nb, 0.3%-1.5% of Ni, smaller than 0.03% of S, smaller than 0.03% of P, 0.06%-0.12% of Ti and the balance of Fe. After composite forming through centrifugal casting, quenching and tempering, the roll has the characteristics of high hardness, good wear resistance and the like, is suitable for popularization and application and has good economic and social benefits.
Description
Technical field
The invention discloses a kind of composite roll and preparation method thereof, particularly a kind of rotary casting wear-resistant high speed steel composite roll and preparation method thereof, belongs to roll manufacturing technology field.
Background technology
Roll is important consumption spare part in Rolling production, and a large amount of consumption of roll, cause the huge waste of resource and the energy.In particularly hot rolling production process, roll working conditions is extremely harsh, not only will have good wear resistance, also will have excellent resistance to high temperature oxidation and crack propagation of thermal fatigue ability, traditional high Adamite, half steel and high-chromium iron-cast roller are difficult to meet its requirement.High-speed steel roll is the good equivalent material of hot roll, has developed multiple high speed steel roll material and technology of preparing thereof both at home and abroad at present.China side patent CN 103805902 discloses a kind of Cutting free high-speed steel roll manufacturing process of rotary casting, it is characterized in that comprising following processing step: 1. body of roll material chemical composition adopts carbon content 1.2-2.8%, silicone content 1.2-2.5%, Fe content 0.3-0.8%, phosphorus content is less than 0.05%, sulphur content is less than 0.04%, all the other alloying elements W, Mo, V, Cr, Nb, Ti, Ni, Al is respectively 2-6%, 2-6%, 2-7%, 3-5%, 0.3-1.5%, 0.1-0.5%, 0-2%, 0-4% material, to ensure the high speed steel substrate obtained in rotary casting state and heat treatment process subsequently containing graphite, 2. die parameters swage thickness/outer molten iron cast thickness G reatT.GreaT.GT 1.25, process redundancy 25-40mm of diameter, the process redundancy 30-50mm of length, wall thickness 120-220mm, to determine mould external diameter, for the roll of different diameter, external diameter and the rim of the mouth of mould form series, are convenient to make and end cap exchange, the mold thickness 30-120mm of under casing, rising head case internal diameter, wall thickness 40-60mm, end cap, swage, under casing, rising head chest form series for different diameter roll, are convenient to exchange, end cap appearance, under casing appearance, rising head appearance diametric(al) process redundancy 20-40mm, pattern draft is 30 '-2 °, swage, after coating, precoated sand coating, is baked to 150 DEG C-250 DEG C, places on whizzer and rotates, prepare cast, 3. the graphitization processing of working lining high speed molten steel is through melting, reaches the working lining molten metal of teeming temperature requirement and component requirements, adopts Ca-Mg-Re-Si-Ti composite inoculant, add-on is the 0.15-0.25% of molten steel amount, mass ratio, lumpiness 3-12mm, places the bag end before tapping, 4. the spheroidizing nodularization dosage of core ductile cast iron material is the 1.7-2.1% of iron water amount, mass ratio, lumpiness 5-15mm, and place the bag end before tapping a blast furnace, instant inoculation amount is the 0.10-0.30% of iron water amount, lumpiness 1-5mm, adds during cast with stream, 5. teeming temperature outer teeming temperature 1460-1520 DEG C, core teeming temperature 1370-1430 DEG C, 6. centrifuge speed: 300-800 rev/min, 7. the cooling parameter type of cooling: naturally cooling in mould, cooling time, 18-48 hour, unpacked during mould temperature < 150 DEG C, 8. heat-treatment of annealing technique: heat-up rate, respectively at 350 DEG C of insulation 2h, 650 DEG C of scope insulation 2h, come out of the stove after 840 DEG C of insulation 3-8h, are cooled to less than 300 DEG C and load quenching in quenching furnance immediately, quenching technology: heat-up rate, come out of the stove after 350 DEG C of insulations 2h, 650-860 DEG C of scope insulation 2h, 1000-1050 DEG C of insulation 3-8h respectively, roll rotation air cooling or spraying, be cooled to less than 300 DEG C and load the stove inside holding tempering that furnace temperature is 300 DEG C immediately, tempering process: first time tempering is carried out after quenching immediately, is chilled to less than 80 DEG C, in temperature-rise period before second time tempering, as≤350 DEG C of 15 DEG C/h, as≤530 DEG C of 20 DEG C/h, respectively at 350 DEG C of insulation 2h, 530 DEG C-550 DEG C insulation 3-8h, then cool to less than 200 DEG C with the furnace and come out of the stove.This beneficial effect of the invention is: the Cutting free rapid steel of production is improved in processing characteristics, can reduce high-speed steel roll difficulty of processing and process-cycle, saves man-hour and cutter, has significant economic benefit; With during norbide tool sharpening Cutting free high-speed steel roll in workpiece linear velocity 20m situation, bite brings up to 3-5mm from original 2mm; Feed brings up to 0.4-0.5mm/r from original 0.2mm/r.China side patent CN 103624230 also discloses a kind of method combining outer Centrifugal Cast High Speed Steel Roll after the match.In high-speed steel roll rotating centrifugal castingprocesses, in the outer set pulse formula magnetic field of mold, the frequency 10-20Hz of Pulsed Magnetic, pulse width is at 15-25 μ s, make the magnetic induction density in casting mold centre at 0.01-0.7T, meanwhile, an electrode is installed respectively at mold two ends, pass into galvanic current stream to the metal be in process of setting in rotational casting process, the current density of galvanic current is 0.1-10A/m
2, utilize the interaction of galvanic current in Pulsed Magnetic and high speed rotating mold inner metal liquid to change the form separating out hard phase in high-speed steel roll process of setting, and utilize the effect of rotary casting to control the distribution of hard phase.This invention combines the technical superiority of Pulsed Magnetic, the casting of magneto-electric coupled and centrifugal rotation, significantly can improve the solidified inside tissue of high-speed steel roll, increase substantially life-span and the use properties of roll.China side patent CN 103317115 also discloses a kind of manufacture method of compound high speed steel roll, comprises the following steps: raw material is placed in medium-frequency induction furnace and carries out melting by the component requirements of the high-speed steel roll of melting as required; Stokehold processes; Adopt three layers of compound and centrifuging process cast roll; Roughing; Thermal treatment; Precision work; Wherein, described melting comprises the smelting of outer molten steel, the fusing of metallic intermediate layer liquid and core molten iron is melting, described thermal treatment comprises Quench and temper technique, and described tempering process is 400-450 DEG C of insulation 10-15 hour, then cools to air cooling of coming out of the stove after below 100 DEG C with the furnace.By the way, this invention can solve the problem being difficult between skin and core unlike material combine, and realizes the transition bonding in middle layer, has fabulous wear resistance and higher hardness, can ensure roll surface quality.China side patent CN 103305775 also discloses a kind of high carbon high speed steel roll, comprise the following ingredients formed 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 inevitable trace element.By the way, the high carbon high speed steel roll of this invention can improve wear-resistant and thermal fatigue resistance.China side patent CN 102828123 also discloses the method for the outer Metamorphism treatment of a kind of centrifugal compound casting high-speed steel roll, it is characterized in that, when the melting of layer rapid steel completes and comes out of the stove outside, in ladle, add compound modifier Metamorphism treatment is carried out to rapid steel molten iron, the add-on of compound modifier is 1.0 ~ 2.0% of Metal Weight, and temperature of reaction is 1500 ~ 1600 DEG C.The chemical component weight per-cent of described compound modifier is: vanadium iron FeV5050 ~ 55%, rare earth ferrosilicon alloy FeSiRe2120 ~ 25%, Si-Ba alloy FeBa5Si6020 ~ 25%, Al5 ~ 10%.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 of even dispersion distribution, improves the outer field wear-resisting and thermotolerance of high-speed steel roll, makes roll millimeter stocking increase by 25% ~ 30% on year-on-year basis.China side patent CN 102766824 also discloses a kind of wear-resistant high speed steel collars and preparation method thereof, its chemical constitution is massfraction %: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 & lt, 0.02, P & lt, 0.03, all the other are Fe.Employing centre spinning method is shaped, and hardness is high, wear resistance good.China side patent CN102962423 also discloses centrifugal compound high-carbon high-boron rapid steel compound roller shell, be composited by outer rapid steel and internal layer graphitized steel, it is characterized in that: outer rapid steel chemical composition is: C1.5 ~ 2.1, Si0.5 ~ 1.2, Mn0.6 ~ 0.8, P < 0.03, S < 0.03, Cr5.0 ~ 10, Ni0.5 ~ 1.0, Mo2.0 ~ 4.0, W0.5 ~ 2.0, Nd0.5 ~ 2.0, V4.0 ~ 6.0, Ti0.5 ~ 1.5, B0.5 ~ 2.0, N0.05 ~ 0.15, surplus is Fe; Internal layer graphitized steel chemical composition is: C1.3 ~ 2.0, Si1.1 ~ 2.0, Mn0.4 ~ 0.8, Cr0.4 ~ 1.5, Ni0.4 ~ 1.5, Mo0.2 ~ 0.6, and surplus is Fe; Manufacture method is: 1) the outer rapid steel of melting, rises to 1600 ~ 1620 DEG C by temperature after stokehold adjusting component is qualified, add aluminium and silico-calcium deoxidation, then come out of the stove; 2) melting internal layer graphitized steel, after stokehold composition adjustment is qualified, rises to 1580 ~ 1600 DEG C and waits for tapping by molten steel temperature, add silico-calcium, ferrosilicon and aluminium and carry out deoxidation, rotten and inoculation in tapping process in molten steel, has operated rear etc. to be cast; 3) outer centrifugal casting is carried out when bag ectonexine rapid steel molten steel temperature drops to 1450 ~ 1500 DEG C, the cast of compound roller shell internal layer is carried out when outer rapid steel inner wall temperature drops to 1200 ~ 1250 DEG C, teeming temperature is 1450 ~ 1500 DEG C, cast thickness is 20 ~ 50mm, and after internal layer solidifies, lower machine carries out insulation cooling; 4) finished product compound roller shell is heat-treated and obtained after machining to composite roll cover blank.Its thermal treatment is for first to carry out 1020 ~ 1050 DEG C of the high temperature anneal, and annealing soaking time is 4 ~ 8h; Carry out quench treatment after roughing, quenching temperature is 1000 ~ 1050 DEG C, and Quenching Soaking Time is 2 ~ 4h, air blast quenching is carried out after insulation terminates, air blast quenching terminates laggard stove and carries out double tempering thermal treatment, and tempering 1 is 500 DEG C × 30h, and tempering 2 is 550 DEG C × 30h.China side patent CN 102615108 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 rapid steel, middle layer graphitized 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, adds niobium element simultaneously, and Nb/V controls at 0.3-0.5, make Nb become double carbide (V, Nb) C with V-arrangement, thus avoid form segregation under centrifugal action.The roller core of compound high speed steel roll adopts high-strength ductile cast iron, and be mixed into Cr for fuse with outer rapid steel when preventing cast magnesium iron, B etc. cause the element of embrittlement, between skin and roller core, pour into a mould polynary graphitized steel middle layer.For preventing occurring crackle in roll centrifugal casting process, roll surface high speed steel material and middle layer graphitized steel being carried out to the microalloy treatment of thinning microstructure, reaching the object improving roll material thermal crack resistant ability.This invention roller comprehensive performance is high, and long service life has good economic benefit.China side patent CN 102274856 also discloses a kind of centrifugal compound high-speed steel roll and pouring procedure thereof, the outer field chemical component weight per-cent of described rapid steel is: C1.8 ~ 2.6%, Cr3 ~ 10%, Nb0.2 ~ 1.0%, Mo4 ~ 10%, V5 ~ 10%, W4 ~ 10%, Co2 ~ 10%, and all the other are Fe and inevitable impurity.The pouring procedure of centrifugal compound high-speed steel roll, comprise melting, cast, cooling unpack, thermal treatment, it is characterized in that, its algorithm is as follows: 1) intermediate frequency furnace melting, carries out intermediate layer molten steel respectively, smelting temperature 1500 ~ 1600 DEG C, the outer molten steel of rapid steel, smelting temperature 1500 ~ 1600 DEG C, spheroidal graphite cast iron core cast iron melting, smelting temperature 1450 ~ 1500 DEG C, 2) respectively to intermediate layer molten steel, the outer molten steel of rapid steel carries out Metamorphism treatment, it is rare earth and silicon barium that intermediate layer molten steel adds refining deterioration agent, addition is 0.2 ~ 0.6%, temperature of reaction is 1500 ~ 1600 DEG C, it is rare earth and silicon barium that the outer molten steel of rapid steel adds refining deterioration agent, addition is 0.2 ~ 0.6%, temperature of reaction is 1500 ~ 1600 DEG C, nodularization and inoculation are carried out to spheroidal graphite cast iron core molten iron, nodulizing agent is yttrium-base heavy rare earth, addition is 1.0 ~ 1.6%, nucleating agent is 75 ferrosilicon, addition is 0.4 ~ 1.0%, temperature of reaction 1450 ~ 1500 DEG C, 3) rotary casting, teeming temperature 1420 ~ 1480 DEG C, first casting high speed steel is outer, centrifugal gravity multiple 100 ~ 120G, cast thickness 90 ~ 110mm, when cast layer is cooled to 1225 ~ 1245 DEG C, rotary casting intermediate layer again, cast thickness 40 ~ 60mm, centrifugal gravity multiple 100 ~ 120G, when cast layer is cooled to stop when 1220 ~ 1240 DEG C, 4) core casting, by step 3 steel casting and roll neck mold mould assembling, through the spheroidal graphite cast iron core molten iron of nodularization and inoculation in static casting step 2, teeming temperature 1350 ~ 1430 DEG C, 5) normal temperature be cooled to 150 ~ 155 DEG C unpack, pallet car type differential temperature stove is adopted to heat-treat, 1000 ~ 1100 DEG C are heated to the rate of heating of 90 ~ 120 DEG C/h, after insulation 3 ~ 5h, be cooled to 420 ~ 460 DEG C with the speed of 110 ~ 130 DEG C/h, then be cooled to room temperature with the speed of 10 ~ 20 DEG C/h, then be heated to 450 ~ 550 DEG C with the rate of heating of 9 ~ 13 DEG C/h, be incubated after 18 ~ 25 hours, be cooled to room temperature with the speed of 10 ~ 20 DEG C/h.This beneficial effect of the invention is: 1) can significantly improve the outer field thermal fatigue resistance of rapid steel and wear resisting property.2) rapid steel bonding strength that is outer and intermediate layer reaches more than 400Mpa, prevents that rapid steel is outer field to be peeled off.
But it is shallow that above-mentioned high-speed steel roll mainly exists depth of hardening zone, roller surface uniformity of hardness difference and skin of the roll and roller core are in conjunction with the deficiency such as bad.
Summary of the invention
The object of the invention is by optimizing the outer composition of layer of high-speed steel roll and improving composite casting technology and heat-treatment quenching process for cooling, overcome depth of hardening zone shallow, roller surface uniformity of hardness difference and skin of the roll and roller core, in conjunction with the problem such as bad, realize increasing substantially of high-speed steel roll performance.
Rotary casting wear-resistant high speed steel composite roll of the present invention is combined into one by outer (body of roll), middle layer and roller core three part, and its concrete step of preparation process is:
1. first in three induction furnaces, distinguish Smelting High Speed Steel composite roll skin (body of roll), middle layer and roller core material, wherein the chemical constitution massfraction % of intermediate layer material is: 1.4 ~ 1.6C, 2.0 ~ 2.4Si, 0.15 ~ 0.25Ni, 0.03 ~ 0.06RE, 0.03 ~ 0.06Ti, 0.03 ~ 0.06Ca, 0.03 ~ 0.06Nb, 0.03 ~ 0.06Ba, 0.008 ~ 0.015N, 1.2 ~ 1.6Mn, S<0.03, P<0.04, surplus Fe, the chemical constitution massfraction % of roller core material is: 3.10 ~ 3.40C, 1.80 ~ 2.20Si, 0.15 ~ 0.29Mn, 0.16 ~ 0.28Cu, 0.025 ~ 0.045Ca, S<0.03, P<0.08,0.035 ~ 0.065Mg, 0.008 ~ 0.018Bi, surplus Fe, chemical composition and the massfraction thereof of outer rapid steel molten steel control at 1.60 ~ 2.40%C, 0.3 ~ 1.0%Mn, 0.3 ~ 1.2%Si, 4.0 ~ 6.5%Cr, 4.0 ~ 6.5%Mo, 3.0 ~ 6.5%V, 3.0 ~ 5.0%W, 1.0 ~ 4.0%Nb, 0.3 ~ 1.5%Ni, S<0.03%, P<0.03%, 0.06 ~ 0.12%Ti, surplus Fe, when outer rapid steel liquid steel temperature reaches 1580 ~ 1600 DEG C, add the metallic aluminium accounting for steel quality mark 0.10 ~ 0.20% in stove, be incubated ladle of coming out of the stove after 4 ~ 6 minutes, particle size 8 ~ 15mm is added in advance in ladle, and rare earth ferrosilicon alloy and the ferro-boron of 60 ~ 120 minutes is dried through 200 ~ 260 DEG C, rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.25 ~ 0.45% and 0.05 ~ 0.12% of steel quality mark in ladle, when liquid steel temperature is down to 1430 ~ 1500 DEG C, molten steel is poured in the casting mold on whizzer, during rotary casting, gravity coefficient controls 75 ~ 120,
2. after outer molten steel all solidifies, continue at whizzer upper intermediate layer material, the teeming temperature of intermediate layer material is 1450 ~ 1510 DEG C, and its thickness is 15 ~ 30mm;
3., after intermediate layer material is poured 12 ~ 18 minutes, roll middle layer internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200 ~ 1260 DEG C, direct casting roller core material molten iron in the quiescent state, roller core molten steel pouring temperature is 1320 ~ 1350 DEG C; After roller core molten iron is poured 24 ~ 48 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing;
4. the compound high speed steel roll after roughing is heated to 1020 ~ 1100 DEG C with stove, be incubated 4 ~ 10 hours, come out of the stove subsequently and air-cooledly again roll is heated to 500 ~ 550 DEG C to temperature 150 ~ 300 DEG C, be incubated after 10 ~ 20 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 500 ~ 550 DEG C, be incubated after 10 ~ 20 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, finally be refined to specified dimension and precision, rotary casting wear-resistant high speed steel composite roll can be obtained.
The chemical constitution massfraction % of ferro-boron described above is: 19.0 ~ 21.0B ,≤0.5C ,≤2.0Si ,≤0.5Al ,≤0.01S ,≤0.1P, surplus Fe.
The chemical constitution massfraction % of rare earth ferrosilicon alloy described above is: 27.0 ~ 30.0RE, 38.0 ~ 42.0Si, <3.0Mn, <5.0Ca, <3.0Ti, and surplus is Fe.
Rotary casting wear-resistant high speed steel composite roll of the present invention, in order to obtain excellent performance, composite roll is outer, and body of roll working lining adopts wear resistance and the excellent high carbon high-speed steel material of red hardness, chemical composition and the massfraction thereof of outer rapid steel molten steel control at 1.60 ~ 2.40%C, 0.3 ~ 1.0%Mn, 0.3 ~ 1.2%Si, 4.0 ~ 6.5%Cr, 4.0 ~ 6.5%Mo, 3.0 ~ 6.5%V, 3.0 ~ 5.0%W, 1.0 ~ 4.0%Nb, 0.3 ~ 1.5%Ni, S<0.03%, P<0.03%, 0.06 ~ 0.12%Ti, surplus Fe.In order to improve obdurability and the Thermal fatigue properties of high carbon high-speed steel, when outer rapid steel liquid steel temperature reaches 1580 ~ 1600 DEG C, add the metallic aluminium accounting for steel quality mark 0.10 ~ 0.20% in stove, be incubated ladle of coming out of the stove after 4 ~ 6 minutes, particle size 8 ~ 15mm is added in advance in ladle, and rare earth ferrosilicon alloy and the ferro-boron of 60 ~ 120 minutes is dried through 200 ~ 260 DEG C, rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.25 ~ 0.45% and 0.05 ~ 0.12% of steel quality mark in ladle.
Fine and close in order to ensure outer tissue, outer and middle layer adopts centre spinning method to be shaped, and when outer liquid steel temperature is down to 1430 ~ 1500 DEG C, poured into by molten steel in the casting mold on whizzer, during rotary casting, gravity coefficient controls 75 ~ 120.After outer molten steel all solidifies, continue at whizzer upper intermediate layer material, intermediate layer material should have good castability, also to there is excellent obdurability, therefore on high carbon steel basis, suitably silicone content is improved, also add more microalloy element in addition for improving its tissue, the chemical constitution massfraction % of intermediate layer material is: 1.4 ~ 1.6C, 2.0 ~ 2.4Si, 0.15 ~ 0.25Ni, 0.03 ~ 0.06RE, 0.03 ~ 0.06Ti, 0.03 ~ 0.06Ca, 0.03 ~ 0.06Nb, 0.03 ~ 0.06Ba, 0.008 ~ 0.015N, 1.2 ~ 1.6Mn, S<0.03, P<0.04, surplus Fe.The teeming temperature of intermediate layer material is 1450 ~ 1510 DEG C, and its thickness is 15 ~ 30mm.
After intermediate layer material is poured 12 ~ 18 minutes, measure roll middle layer internal surface temperature, when temperature is 1200 ~ 1260 DEG C by non-contact type thermodetector, direct casting roller core molten iron in the quiescent state, the chemical constitution massfraction % of roller core material is: 3.10 ~ 3.40C, 1.80 ~ 2.20Si, 0.15 ~ 0.29Mn, 0.16 ~ 0.28Cu, 0.025 ~ 0.045Ca, S<0.03, P<0.08,0.035 ~ 0.065Mg, 0.008 ~ 0.018Bi, surplus Fe.Roller core material not only good casting property, combines closely with transition layer (middle layer), and has excellent obdurability, guarantees work roll cooling safety.Roller core molten steel pouring temperature is 1320 ~ 1350 DEG C.After roller core molten iron is poured 24 ~ 48 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing.
Compound high speed steel roll after roughing is heated to 1020 ~ 1100 DEG C with stove, be incubated 4 ~ 10 hours, come out of the stove subsequently air-cooled to temperature 150 ~ 300 DEG C, can guarantee that compound high speed steel roll matrix is that master adds appropriate austenite with martensite, there is excellent wear resistance.Roll is heated to 500 ~ 550 DEG C by compound high speed steel roll after air blast quenching again, be incubated after 10 ~ 20 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 500 ~ 550 DEG C, be incubated after 10 ~ 20 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, mainly in order to ensure proeutectoid carbide disperse educt, stabilizing tissue, eliminates stress, and guarantees the safe handling of compound high speed steel roll.
The present invention compared with prior art, has the following advantages:
1) the outer roll surface hardness of rotary casting wear-resistant high speed steel composite roll of the present invention is high, and more than 82HSD, roll surface uniformity of hardness is good, and roll surface difference of hardness is less than 2HSD;
2) rotary casting wear-resistant high speed steel composite roll of the present invention outer, combine between middle layer and roller core three good;
3) rotary casting wear-resistant high speed steel composite roll of the present invention has excellent wear resistance, and its millimeter of steel transportation amount improves more than 3 times than high Ni-Cr infinite cold hardness cast iron roll.
Accompanying drawing explanation
Fig. 1 rotary casting wear-resistant high speed steel composite roll schematic diagram;
1-is outer, 2-middle layer, 3-roller core.
Embodiment
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to following examples.
Embodiment 1:
Rotary casting wear-resistant high speed steel composite roll roll diameter of the present invention
be combined into one by outer (body of roll), middle layer and roller core three part, outer layer thickness 60mm, intermediate layer thickness 30mm, skin, middle layer and roller core adopt three electrosmeltings respectively, and its concrete step of preparation process is:
1. first in three induction furnaces, distinguish Smelting High Speed Steel composite roll skin, middle layer and roller core material, wherein the chemical constitution massfraction % of intermediate layer material is: 1.41C, 2.38Si, 0.15Ni, 0.033RE, 0.058Ti, 0.032Ca, 0.055Nb, 0.057Ba, 0.009N, 1.59Mn, 0.021S, 0.033P, surplus Fe.The chemical constitution massfraction % of roller core material is: 3.38C, 1.80Si, 0.16Mn, 0.28Cu, 0.026Ca, 0.013S, 0.058P, 0.043Mg, 0.016Bi, surplus Fe.Chemical composition and the massfraction thereof of outer rapid steel molten steel control at 1.64%C, 0.97%Mn, 0.38%Si, 4.05%Cr, 6.38%Mo, 6.45%V, 3.09%W, 1.38%Nb, 0.36%Ni, 0.027%S, 0.029%P, 0.11%Ti, surplus Fe.When outer rapid steel liquid steel temperature reaches 1599 DEG C, add the metallic aluminium accounting for steel quality mark 0.20% in stove, be incubated ladle of coming out of the stove after 4 minutes, particle size 8 ~ 15mm is added in advance in ladle, and through 200 DEG C of oven dry rare earth ferrosilicon alloy of 120 minutes, (the chemical constitution massfraction % of rare earth ferrosilicon alloy is: 27.08RE, 38.69Si, 2.11Mn, 3.04Ca, 1.85Ti, surplus is Fe) and ferro-boron (the chemical constitution massfraction % of ferro-boron is: 19.05B, 0.31C, 1.42Si, 0.26Al, 0.005S, 0.038P, surplus Fe), rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.45% and 0.05% of steel quality mark in ladle, when liquid steel temperature is down to 1488 DEG C, molten steel is poured in the casting mold on whizzer, during rotary casting, gravity coefficient controls 85.
2. after outer molten steel all solidifies, continue at whizzer upper intermediate layer material, the teeming temperature of intermediate layer material is 1499 DEG C, and its thickness is 30mm.
3., after intermediate layer material is poured 18 minutes, measure roll middle layer internal surface temperature by non-contact type thermodetector, when temperature is 1200 ~ 1260 DEG C, direct casting roller core molten iron in the quiescent state, roller core molten steel pouring temperature is 1324 DEG C.After roller core molten iron is poured 48 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing.
4. the compound high speed steel roll after roughing is heated to 1100 DEG C with stove, be incubated 8 hours, come out of the stove subsequently air-cooled to temperature 280 DEG C, again roll is heated to 550 DEG C, be incubated after 10 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 500 DEG C, is incubated after 20 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, finally be refined to specified dimension and precision, can obtain rotary casting wear-resistant high speed steel composite roll, its mechanical property is in table 1.
Embodiment 2:
Rotary casting wear-resistant high speed steel composite roll roll diameter of the present invention
be combined into one by outer (body of roll), middle layer and roller core three part, outer layer thickness 55mm, intermediate layer thickness 20mm, skin, middle layer and roller core adopt three electrosmeltings respectively, and its concrete step of preparation process is:
1. first in three induction furnaces, distinguish Smelting High Speed Steel composite roll skin, middle layer and roller core material, wherein the chemical constitution massfraction % of intermediate layer material is: 1.57C, 2.02Si, 0.24Ni, 0.059RE, 0.031Ti, 0.059Ca, 0.035Nb, 0.037Ba, 0.014N, 1.24Mn, 0.017S, 0.029P, surplus Fe.The chemical constitution massfraction % of roller core material is: 3.12C, 2.20Si, 0.27Mn, 0.18Cu, 0.044Ca, 0.018S, 0.046P, 0.058Mg, 0.009Bi, surplus Fe.Chemical composition and the massfraction thereof of outer rapid steel molten steel control at 2.36%C, 0.33%Mn, 1.18%Si, 4.30%Cr, 4.62%Mo, 3.08%V, 4.99%W, 3.87%Nb, 1.44%Ni, 0.022%S, 0.027%P, 0.07%Ti, surplus Fe.When outer rapid steel liquid steel temperature reaches 1584 DEG C, add the metallic aluminium accounting for steel quality mark 0.10% in stove, be incubated ladle of coming out of the stove after 6 minutes, particle size 8 ~ 15mm is added in advance in ladle, and through 260 DEG C of oven dry rare earth ferrosilicon alloy of 80 minutes, (the chemical constitution massfraction % of rare earth ferrosilicon alloy is: 29.05RE, 41.37Si, 2.06Mn, 4.52Ca, 1.88Ti, surplus is Fe) and ferro-boron (the chemical constitution massfraction % of ferro-boron is: 20.84B, 0.35C, 1.56Si, 0.29Al, 0.008S, 0.046P, surplus Fe), rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.25% and 0.12% of steel quality mark in ladle, when liquid steel temperature is down to 1439 DEG C, molten steel is poured in the casting mold on whizzer, during rotary casting, gravity coefficient controls 78.
2. after outer molten steel all solidifies, continue at whizzer upper intermediate layer material, the teeming temperature of intermediate layer material is 1453 DEG C, and its thickness is 20mm.
3., after intermediate layer material is poured 15 minutes, measure roll middle layer internal surface temperature by non-contact type thermodetector, when temperature is 1200 ~ 1260 DEG C, direct casting roller core molten iron in the quiescent state, roller core molten steel pouring temperature is 1347 DEG C.After roller core molten iron is poured 36 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing.
4. the compound high speed steel roll after roughing is heated to 1050 DEG C with stove, be incubated 6 hours, come out of the stove subsequently air-cooled to temperature 180 DEG C, again roll is heated to 500 DEG C, be incubated after 20 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 550 DEG C, is incubated after 10 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, finally be refined to specified dimension and precision, can obtain rotary casting wear-resistant high speed steel composite roll, its mechanical property is in table 1.
Embodiment 3:
Rotary casting wear-resistant high speed steel composite roll roll diameter of the present invention
be combined into one by outer (body of roll), middle layer and roller core three part, outer layer thickness 50mm, intermediate layer thickness 15mm, skin, middle layer and roller core adopt three electrosmeltings respectively, and its concrete step of preparation process is:
1. first in three induction furnaces, distinguish Smelting High Speed Steel composite roll skin, middle layer and roller core material, wherein the chemical constitution massfraction % of intermediate layer material is: 1.48C, 2.31Si, 0.19Ni, 0.047RE, 0.040Ti, 0.048Ca, 0.051Nb, 0.046Ba, 0.011N, 1.45Mn, 0.028S, 0.035P, surplus Fe.The chemical constitution massfraction % of roller core material is: 3.26C, 1.97Si, 0.19Mn, 0.21Cu, 0.029Ca, 0.021S, 0.063P, 0.048Mg, 0.012Bi, surplus Fe.Chemical composition and the massfraction thereof of outer rapid steel molten steel control at 1.99%C, 0.65%Mn, 0.70%Si, 5.08%Cr, 4.98%Mo, 5.12%V, 3.57%W, 2.06%Nb, 0.93%Ni, 0.025%S, 0.028%P, 0.09%Ti, surplus Fe.When outer rapid steel liquid steel temperature reaches 1597 DEG C, add the metallic aluminium accounting for steel quality mark 0.15% in stove, be incubated ladle of coming out of the stove after 5 minutes, particle size 8 ~ 15mm is added in advance in ladle, and through 240 DEG C of oven dry rare earth ferrosilicon alloy of 100 minutes, (the chemical constitution massfraction % of rare earth ferrosilicon alloy is: 28.54RE, 39.05Si, 2.08Mn, 3.29Ca, 1.64Ti, surplus is Fe) and ferro-boron (the chemical constitution massfraction % of ferro-boron is: 19.80B, 0.40C, 1.37Si, 0.32Al, 0.008S, 0.051P, surplus Fe), rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.35% and 0.08% of steel quality mark in ladle, when liquid steel temperature is down to 1464 DEG C, molten steel is poured in the casting mold on whizzer, during rotary casting, gravity coefficient controls 115.
2. after outer molten steel all solidifies, continue at whizzer upper intermediate layer material, the teeming temperature of intermediate layer material is 1482 DEG C, and its thickness is 15mm.
3., after intermediate layer material is poured 12 minutes, measure roll middle layer internal surface temperature by non-contact type thermodetector, when temperature is 1200 ~ 1260 DEG C, direct casting roller core molten iron in the quiescent state, roller core molten steel pouring temperature is 1346 DEG C.After roller core molten iron is poured 24 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing.
4. the compound high speed steel roll after roughing is heated to 1020 DEG C with stove, be incubated 8 hours, come out of the stove subsequently air-cooled to temperature 160 DEG C, again roll is heated to 530 DEG C, be incubated after 15 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 530 DEG C, is incubated after 15 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, finally be refined to specified dimension and precision, can obtain rotary casting wear-resistant high speed steel composite roll, its mechanical property is in table 1.
Table 1 rotary casting wear-resistant high speed steel composite roll mechanical property
The outer roll surface hardness of rotary casting wear-resistant high speed steel composite roll of the present invention is high, and more than 82HSD, roll surface uniformity of hardness is good, and roll surface difference of hardness is less than 2HSD.Through UT (Ultrasonic Testing), find that rotary casting wear-resistant high speed steel composite roll of the present invention is outer, it is good to combine between middle layer and roller core three.Roll roller core intensity of the present invention is high, can guarantee the safe handling of roll.Roll of the present invention has been pricked in frame in hot rolled strip essence and has been used, and use result to show, roll wear of the present invention is even, and have good resistance to wearing and thermal fatigue resistance, its millimeter of steel transportation amount improves more than 3 times than high Ni-Cr infinite cold hardness cast iron roll.Use roll of the present invention, can operating rate of rolling mill be improved, improve stocking surface quality, alleviate labor strength, apply and there is good economic and social benefit.
Claims (4)
1. a method for rotary casting wear-resistant high speed steel composite roll, is characterized in that, composite roll is combined into one by skin, middle layer and roller core three part, and its concrete step of preparation process comprises as follows:
1. first in three induction furnaces, distinguish Smelting High Speed Steel composite roll skin, middle layer and roller core material, wherein the chemical constitution massfraction % of intermediate layer material is: 1.4 ~ 1.6C, 2.0 ~ 2.4Si, 0.15 ~ 0.25Ni, 0.03 ~ 0.06RE, 0.03 ~ 0.06Ti, 0.03 ~ 0.06Ca, 0.03 ~ 0.06Nb, 0.03 ~ 0.06Ba, 0.008 ~ 0.015N, 1.2 ~ 1.6Mn, S<0.03, P<0.04, surplus Fe, the chemical constitution massfraction % of roller core material is: 3.10 ~ 3.40C, 1.80 ~ 2.20Si, 0.15 ~ 0.29Mn, 0.16 ~ 0.28Cu, 0.025 ~ 0.045Ca, S<0.03, P<0.08,0.035 ~ 0.065Mg, 0.008 ~ 0.018Bi, surplus Fe, chemical composition and the massfraction thereof of outer rapid steel molten steel control at 1.60 ~ 2.40%C, 0.3 ~ 1.0%Mn, 0.3 ~ 1.2%Si, 4.0 ~ 6.5%Cr, 4.0 ~ 6.5%Mo, 3.0 ~ 6.5%V, 3.0 ~ 5.0%W, 1.0 ~ 4.0%Nb, 0.3 ~ 1.5%Ni, S<0.03%, P<0.03%, 0.06 ~ 0.12%Ti, surplus Fe, when outer rapid steel liquid steel temperature reaches 1580 ~ 1600 DEG C, add the metallic aluminium accounting for steel quality mark 0.10 ~ 0.20% in stove, be incubated ladle of coming out of the stove after 4 ~ 6 minutes, particle size 8 ~ 15mm is added in advance in ladle, and rare earth ferrosilicon alloy and the ferro-boron of 60 ~ 120 minutes is dried through 200 ~ 260 DEG C, rare earth ferrosilicon alloy and ferro-boron add-on account for respectively and enter 0.25 ~ 0.45% and 0.05 ~ 0.12% of steel quality mark in ladle, when liquid steel temperature is down to 1430 ~ 1500 DEG C, molten steel is poured in the casting mold on whizzer, during rotary casting, gravity coefficient controls 75 ~ 120,
2. after outer molten steel all solidifies, continue at whizzer upper intermediate layer material, the teeming temperature of intermediate layer material is 1450 ~ 1510 DEG C, and its thickness is 15 ~ 30mm;
3., after intermediate layer material is poured 12 ~ 18 minutes, roll middle layer internal surface temperature is measured by non-contact type thermodetector, when temperature is 1200 ~ 1260 DEG C, direct casting roller core material molten iron in the quiescent state, roller core molten steel pouring temperature is 1320 ~ 1350 DEG C; After roller core molten iron is poured 24 ~ 48 hours, takes out compound high speed steel roll and enter burial pit, then carry out roughing;
4. the compound high speed steel roll after roughing is heated to 1020 ~ 1100 DEG C with stove, be incubated 4 ~ 10 hours, come out of the stove subsequently and air-cooledly again roll is heated to 500 ~ 550 DEG C to temperature 150 ~ 300 DEG C, be incubated after 10 ~ 20 hours, stove is chilled to temperature lower than 200 DEG C, again roll is heated to 500 ~ 550 DEG C, be incubated after 10 ~ 20 hours, stove is chilled to temperature and comes out of the stove air cooling to room temperature after 200 DEG C, finally be refined to specified dimension and precision, rotary casting wear-resistant high speed steel composite roll can be obtained.
2. according to the method for claim 1, it is characterized in that, the chemical constitution massfraction % of described ferro-boron is: 19.0 ~ 21.0B ,≤0.5C ,≤2.0Si ,≤0.5Al ,≤0.01S ,≤0.1P, and surplus is Fe.
3. according to the method for claim 1, it is characterized in that, the chemical constitution massfraction % of described rare earth ferrosilicon alloy is: 27.0 ~ 30.0RE, 38.0 ~ 42.0Si, <3.0Mn, <5.0Ca, <3.0Ti, surplus is Fe.
4. according to the wear-resistant high speed steel composite roll that the either method of claim 1-3 prepares.
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| CN115647060A (en) * | 2022-12-28 | 2023-01-31 | 石家庄石特轧辊有限公司 | High-chromium cast iron roller and production method thereof |
| CN117226075A (en) * | 2023-10-08 | 2023-12-15 | 湖南省品源机械制造有限公司 | Integrally formed bimetal cast roller and casting process thereof |
| CN117226075B (en) * | 2023-10-08 | 2024-02-23 | 湖南省品源机械制造有限公司 | Manufacturing process of integrally formed bimetal cast roller |
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| CN104264043B (en) | 2017-04-05 |
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