CN102634733B - Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll - Google Patents
Composite roll having uniform roll surface hardness and made of high-speed steel containing boron and method for manufacturing composite roll Download PDFInfo
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Abstract
A composite roll having uniform roll surface hardness and made of high-speed steel containing boron and a method for manufacturing the composite roll belong to the technical field of manufacture of rolls. A roll body is made of the high-speed steel containing boron, a roll core is made of spheroidal graphite cast iron, the roll body and the roll core are centrifugally cast in a compounded manner, and metallurgical bonding is realized. On the basis of high-tungsten high-speed steel, the chromium content of the roll body is reduced, and the boron and a proper quantity of trace alloying elements such as potassium, sodium, calcium, barium, zinc, magnesium, lanthanum, cerium and the like aer added into the roll body. The roll body is heated in a heating furnace, stays warm and then is placed in a cooling control device, a roll neck is coated with a heat-insulating material and is placed outside the cooling control device, the roll body is in spray cooling according to a spray quenching process 1, then is in spray cooling according to a spray quenching process 2 until the temperature of the roll body is lower than 160 DEG C, and is in natural air cooling, when the temperature of the roll surface rises to 300 DEG C, the roll body is in spray cooling according to the spray quenching process 2 again, spray cooling is performed repeatedly until the rising temperature of the roll surface does not exceed 300 DEG C, and then the roll body is in air cooling to the room temperature. The roll surface hardness of the composite roll is high, hardness uniformity of the roll surface is good, wear resistance of the roll is fine, and the service life of the composite roll is long.
Description
Technical field
The present invention is a kind of compound high speed steel roll manufacture method, and uniform boracic high-speed steel composite roll of particularly a kind of roll surface hardness and manufacture method thereof belong to roll manufacturing technology field.
Background technology
Modern metallurgical industry production is that centralized procurement ore deposit, ore dressing, sintering, ironmaking, steel-making and steel rolling are the systems engineering of one, and steel rolling is last link of this systems engineering, and most metallurgic products will just can come into the market through the operation of rolling.And roll is a most important means of production in the operation of rolling, and the quality quality of roll directly affects the output and the quality of metallurgic product, and the height of the roll manufacturing technology of a country has directly reflected the height of this state's metallurgical industry level.Modern metallurgical roller has experienced several significant process from the development of material and manufacturing process: roll material develops into composite roll with high Minvar, the rich chromium cast iron casting high speed steel until recent development gradually from single white cast iron, spheroidal graphite cast iron, cast steel; It (is a kind of material of roll roll surface that manufacturing process also develops into composite casting technology from common integral casting process, the another kind of material of roller core, metallurgical binding between the two), composite casting technology develops into the so far state-of-the-art continuous casting composite casting of centrifugal casting (being the CPC method) roll manufacturing technology from static casting method (being press over system or irrigation).But domestic roll falls behind because of heat treatment technics, and its roll surface hardness ununiformity reaches about 8HSD, than international most advanced level superelevation 4～6HSD, roll surface hardness is inhomogeneous to cause the Roller Machining difficulty, and wear resistance, thermal fatigue resistance, cracking resistance line and resistance to fracture are poor, and roll is short work-ing life.
In order to improve roller performance, Chinese invention patent CN101215628 discloses high speed steel composite roller heat treatment method and has belonged to technical field of steel rolling.The present invention at first carries out anneal with roll, annealing temperature: 870-890 ℃, and soaking time: 6-10 hour.Carry out induction quenching again on 50Hz/250Hz double frequency quenching machine, roll carries out thermal pretreatment before induction quenching, and preheating temperature 280-350 ℃, 6-10 hour preheating insulation time.When quenching heating, roll need rotate and vertical moving down vertically.Roll heating back is water-cooled fast, carries out the temper first time at 520-560 ℃ then, and tempering insulation time 4-6 hour, air cooling subsequently.Roll is reheated to 500-540 ℃ again and carry out the temper second time, tempering insulation time 6-8 hour, stove was chilled to less than air cooling after 200 ℃ then.Above-mentioned heat treating method exists troublesome poeration and quench-hardened case more shallow etc. not enough.Chinese invention patent CN1129617 also discloses a kind of manufacture method of composite roll, it is characterized in that on a kind of electroslag molten casting device, adopts the electroslag casting method to make composite roll.To make good roller core in advance is the interior crystallizer of electroslag casting, is the consumable electrode of electroslag casting with need compound roll sheathcoat material.The diameter of the internal diameter of the outer crystallizer of this device and the outlet of disjunctor dual U-shaped crucible molten metal need to equal the external diameter of compound composite roll; The melting rate of consumable electrode is controlled at 100～1000kg/h.Consumable electrode can be more than 1 or two.This method can make composite roll obtain narrower excessive layer and good composite performance.There is the low and high deficiency of energy consumption of efficient in aforesaid method.Chinese invention patent CN1082950 also discloses composite roll and its production method, it is characterized in that the housing parts made with excellent wear and the anti-hard high alloy cast steel of surperficial roughen or cast iron and with the composite roll of the core of tough and tensile cast iron or cast steel manufacturing, the formation of housing parts cast iron is 1.0-3.0%C by weight, 2.0% or lower Si, 2.0% or lower Mn, 2.0-15.0% Cr, 10.0% or lower Mo, 2.0-8.0% V, all the other are Fe and unavoidable impurities, in case surface to 50 mm depth scope, determine by analyzing, the average grain diameter 100 μ m or littler of metal construction matrix, and satisfy formula m2≤1.2m1, m1 is the case surface average grain diameter in the formula, m2 is 50 mm depth place average grain diameters, and this composite roll is created with centre spinning method, and roll adopts common centre spinning method production, segregation is serious, and uniformity of hardness is relatively poor.Chinese invention patent CN1631565 High Vanadium Rapid Steel Composite Roll And Production Technology, roll is divided into roller core and roll wearing layer, roller core adopts toughness low alloy steel or mild steel material making preferably, the roll wearing layer adopts the high-vanadium high-speed steel material, the principal element content of this high-vanadium high-speed steel is: C:1.8-3.5%, V:7-12%, Cr:4-5%, Mo:2-4%, Ni:0.5-1.5%, surplus is an iron.Its production technique is: roller core and roll wearing layer are one by the compound founding of induction heating consecutive solidification crystallization method, and aforesaid method exists content of vanadium too high, the deficiency of roll dressing poor performance.
In order to improve roll roll surface uniformity of hardness, Chinese patent CN2545213 discloses roll curtain-type water ring refrigerating unit, its technical measures: mainly form by water storage storehouse (3), workpiece hole (4) and water jet (5) in water spray ring body (1), water-in (2), the water spray ring body (1), the ring body (1) that it is characterized in that spraying water is divided into water spray ring cowling (6) and water ring lower body (7) two portions, and water spray ring cowling (6) and water ring lower body (7) water jet (5) between the two are the annular slot formula.Advantage of the present utility model be to make its surface cool evenly and hardness quality height, no soft spots, quench thorough, be difficult for producing and be out of shape.But this device structure complexity is directly used in the quench cooled troublesome poeration of composite roll.People such as Guo Feng (Guo Feng; Liu Shiyu; Zhao Xiquan. the improvement of the whole differential heating fog quenching of fluting roll technology. heavy casting and forging; 2002 the 3rd phases: 22～25 pages) also studied the whole differential heating fog quenching of fluting roll technology; discover; when the fluting roll is sprayed after heating; angle, outer end, both sides collapses the limit; cause scrapping; developed and attach the angle, opposite end and protect, will attach during spraying and be placed on place, body of roll end angle, avoided fog to be directly injected to place, work end angle effectively; prevented that water smoke from collapsing the appearance of limit phenomenon to the cooling of work end angle is too drastic with the end angle, but had the deficiency of troublesome poeration.Chinese invention patent CN 1221036 also discloses a kind of roll, straightening roll method for quenching surface and quenching apparatus.Said quenching apparatus comprises lathe, argon welder, water jet composition, described roll, straightening roll method for quenching surface are, roll, straightening roll rotate with certain circumferential speed, and argon-arc torch with the speed of working good along roll, straightening roll axial motion, water jet is fixed on below the welding torch.The argon arc burning, heat on breaker roll, straightening roll surface, simultaneously roll, the straightening roll water spray Cooling Quenching of water jet to having heated.But this method needs the argon arc burning, and the roller surface temperature homogeneity is relatively poor, and roll roll surface uniformity of hardness is not high yet.Chinese patent CN1321780A also discloses the horizontal spray quenching device of a kind of cold roll.This device is made up of main jet hydrophone, secondary water-jet, work mounting s and drive system and water pump etc., is the horizontal equipment water jetting cooler of a kind of semi-ring open type.Directly place this device after cold roll integral body is heated to quenching temperature, be subjected to the cooling of high-pressure uniform water spray simultaneously rotating.Need not workpiece is taked local thermal insulation or shielding measure, easy to operate.This device can be regulated water spray cooled region size and cooling rate within the specific limits.Quenching hardness is high and even; Case depth is big.But, in the roller quenching process of cooling, earlier cold roll integral body is heated to quenching temperature, place horizontal spray quenching device then, roll is subjected to the cooling of high-pressure uniform water spray simultaneously rotating, and workpiece (being roll) is not taked local thermal insulation or shielding measure, causes being prone in the roller neck matrix martensite of high rigidity, roll neck hardness obviously improves, and toughness descends.Therefore, roll in use with the bearing wear of aggravation back up roll, reduces the rolling mill operating rate, increases the steel rolling cost.In addition, the roll neck flexible descends, and causes being prone to roll breakage accident in the roll use, influences the ordinary production of steel rolling.In addition, in the roller quenching process of cooling, directly water spray cooling, too fast because of speed of cooling, and carbon and alloying element content are higher in the roll, and quenching crack very easily appears in roll." on the 288th page and 289 pages of the thermal treatment handbook third edition the 2nd volume, the quenching and the tempering of cold roll have also been introduced what China Machine Press published.Roll neck will carry out thermal insulation before having mentioned the cold roll heating in the handbook, and body surface will be coated with the anti-oxidation decarburizing agent, after heating finishes, earlier flexible pipe and conduit is connected, and eliminates the oxide skin of body surface, drops into immediately then in the condensing rings in the tank and carries out quenching.But " the roller quenching heat treating method of introducing in the thermal treatment handbook, the part roll neck still is exposed in the quenching condensing rings, too fast in order to prevent the roll neck cooling, higher and the toughness decline phenomenon of hardness appears, roll neck needs to add heat screen, complex structure except being coated with thermal insulation material, troublesome poeration, labor strength is big.
Chinese invention patent CN100485075C also discloses a kind of high-carbon high-high-vanadium high-speed steel composite roller, the chemical ingredients and the weight percent thereof of this high-carbon high-high-vanadium high-speed steel skin of the roll that makes are: C:1.8%～3.0%, V:3.0%～6.0%, Cr:4.0%～6.0%, Mo:3.0%～6.0%, W:1.0%～3.0%, Nb:1.0%～5.0%, Co:1.0%～5.0%, Si＜1.0%, Mn＜1.5%, P＜0.04%, S＜0.04%, Y:0.05%～0.20%, Ti:08%～0.25%, Mg:0.03%～0.12%, Zr:0.04%～0.18%, Te:0.02%～0.12%, surplus is Fe, and the summation of chemical ingredients is 100%.Its thermal treatment process comprises quench hot and temper, 1000 ℃～1050 ℃ of quenching temperatures, soaking time 2～4 hours.During quench cooled, elder generation's spray cooling 10～20 minutes, air blast cooling subsequently 20～40 minutes, when air cooling to roll surface temperature is lower than 200 ℃, go into process furnace and carry out the temper first time, tempering heat-up rate＜80 ℃/h, 520 ℃～560 ℃ of tempering Heating temperatures are incubated air cooling after 5～8 hours, when roll surface temperature is lower than 200 ℃, go into process furnace and carry out the temper second time, tempering heat-up rate＜120 ℃/h, 500 ℃～540 ℃ of tempering Heating temperatures, it is cold to be incubated after 8～12 hours stove, after furnace temperature is lower than 200 ℃, come out of the stove, and be refined to specified dimension.The deficiency of its maximum is, in the roll process of cooling, not only roll surface cools off fast, and roller neck is cooling fast too, is prone to the martensite of high rigidity in the roll neck matrix, roll neck hardness is obviously improved, toughness descends, and causes in the roll use bearing wear of aggravation back up roll, reduce the rolling mill operating rate, increase the steel rolling cost.In addition, the roll neck flexible descends, and causes being prone to roll breakage accident in the roll use, influences the ordinary production of steel rolling.Chinese invention patent CN101760603A discloses the manufacture method of the good composite roll of a kind of roll surface uniformity of hardness, it is characterized in that composite roll at first at the process furnace internal heating to more than the stagnation point AC1 80～150 ℃, be placed in the controlled cooling device through insulation, elder generation's spray cooling 5～15 minutes, air cooling is 20～60 minutes then, go into stove when last air cooling to roll surface temperature is lower than 300 ℃ and carry out temper, 450～580 ℃ of tempering Heating temperatures, air cooling was to room temperature after stove was chilled to temperature and is lower than 200 ℃ after being incubated.Roll roll surface hardness of the present invention is even, and obviously prolong work-ing life.But this invention roll also will carry out temper after quench cooled, and the cycle is long, and efficient is low.
Summary of the invention
The present invention be directed to the deficiency that existing roll heat treatment technics exists, a kind of uniform roll thermal treatment of boracic high-speed steel composite roll roll surface hardness method of cooling of guaranteeing has been proposed, be characterized in that the boracic high-speed steel composite roll is after heating and insulation, roll is placed controlled cooling device, and make in the roll process of cooling and rotate with certain speed, apply lagging material at roller neck surface simultaneously, and roll neck places beyond the controlled cooling device.It is good to obtain roll surface hardness height and uniformity of hardness like this, the composite roll that the roll neck obdurability is good.In addition, in the boracic high-speed steel composite roll process of cooling,, regulate and control the spray cooling processing parameter, and utilize the heat of roll centre, realize the self-tempering of boracic high-speed steel composite roll, reach the directly purpose of use of back of quenching by the measuring roller surface temperature.
The present invention can realize by following measure.
The uniform boracic high-speed steel composite roll of a kind of roll surface hardness is characterized in that, the boracic high-speed steel composite roll body of roll adopts boracic high-speed steel, roll centre and roll neck adopt spheroidal graphite cast iron, and the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method, the concrete composition and the massfraction % of body of roll boracic high-speed steel are as follows: 0.80 ~ 0.95C, 1.20 ~ 1.35B, 2.50 ~ 2.70Cr, 0.60 ~ 0.80V, 12.50 ~ 12.80W, 1.60 ~ 1.80Mo, 0.03 ~ 0.05K, 0.03 ~ 0.05Na, 0.04 ~ 0.06Ce, 0.04 ~ 0.06La, 0.025 ~ 0.035Ca, 0.025 ~ 0.035Ba, 0.12 ~ 0.15Mg, 0.04 ~ 0.06Zn, Si＜1.0, Mn＜0.60, S＜0.025, P＜0.035, Fe surplus, 0.06＜K+Na＜0.10,0.08＜La+Ce＜0.12 wherein.
The manufacture method of the uniform boracic high-speed steel composite roll of above-mentioned a kind of roll surface hardness is characterized in that, may further comprise the steps:
(1) the boracic high-speed steel composite roll body of roll adopts boracic high-speed steel, and roll centre and roll neck adopt spheroidal graphite cast iron, and the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method.
(2), at first with the boracic high-speed steel composite roll in process furnace internal heating to 1060～1080 ℃, be placed in the controlled cooling device through being incubated 4～6h, and make in the roll process of cooling speed rotation with 15～20rpm, apply lagging material at roller neck surface simultaneously, and roll neck places beyond the controlled cooling device.
(2), the boracic high-speed steel composite roll in controlled cooling device, earlier by fog quenching technology 1 spray cooling 5～6 minutes, the parameter of fog quenching technology 1: P
Air=0.12～0.15MPa, P
Water=0.30～0.35MPa, Q
Water=1.65～1.80m
3/ h; By fog quenching technology 2, continue spray cooling boracic high-speed steel composite roll roll surface, the parameter of fog quenching technology 2: P then
Air=0.45～0.55MPa, P
Water=0.05～0.07MPa, Q
Water=0.35～0.45m
3/ h, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.
(4), in the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.So repeatedly, go up to be no more than 300 ℃ until roll surface temperature, can stop spray cooling, the roll surface air cooling carries out precision work to room temperature.Can on milling train, directly use then.
Principle of the present invention is as follows:
The boracic high-speed steel composite roll body of roll of the present invention adopts boracic high-speed steel, and roll centre adopts spheroidal graphite cast iron, and the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method.The concrete composition of body of roll boracic high-speed steel of the present invention (massfraction, %) as follows: 0.80 ~ 0.95C, 1.20 ~ 1.35B, 2.50 ~ 2.70Cr, 0.60 ~ 0.80V, 12.50 ~ 12.80W, 1.60 ~ 1.80Mo, 0.03 ~ 0.05K, 0.03 ~ 0.05Na, 0.04 ~ 0.06Ce, 0.04 ~ 0.06La, 0.025 ~ 0.035Ca, 0.025 ~ 0.035Ba, 0.12 ~ 0.15Mg, 0.04 ~ 0.06Zn, Si＜1.0, Mn＜0.60, S＜0.025, P＜0.035, Fe surplus, wherein 0.06＜K+Na＜0.10,0.08＜La+Ce＜0.12.Boracic high-speed steel of the present invention is on high tungsten highspeed steel basis, suitably reduces chromium content, and adds hardening capacity and hardenability that boron improves material.In addition, for thinning microstructure and the form and the distribution that improve carbon-boron compound, improve the intensity and the toughness of boracic high-speed steel, and improve its wear resistance, microalloy elements such as an amount of potassium, sodium, calcium, barium, zinc, magnesium, lanthanum and cerium have also been added, to promote the further raising of boracic high-speed steel performance.
The thermal treatment of boracic high-speed steel composite roll of the present invention be at first with roll in process furnace internal heating to 1060～1080 ℃, insulation 4～6h, its objective is and impel the matrix austenitizing, and with the solid solution of part carbon-boron compound in matrix, promote the improvement of matrix hardening capacity and hardenability, help obtaining in the subsequent cooling process martensitic stucture of high rigidity.In addition, heat and insulation also help the suspension and isolated distribution of carbon-boron compound, promote the raising of boracic high-speed steel composite roll material obdurability.Roll is placed in the controlled cooling device through insulation, and makes in the roll process of cooling speed rotation with 15～20rpm, helps the cooling of roll roll surface evenly, and is favourable to the homogeneity that improves roll surface hardness.Simultaneously apply lagging material, and roll neck places beyond the controlled cooling device, can guarantee the roll neck cooling slowly, help improving the roll neck obdurability, prevent that roll neck from fracture accident occurring in using at roller neck surface.The thickness of roll lagging material of the present invention is at 2-4mm, and thermal conductivity is less than 0.08 (w/m.k).Thickness non-scale, does not ftracture between 2-4mm, surpass 4mm then peeling, ftracture, peel off, thereby can not get effect of the present invention.Thickness is less than 2mm, and then heat-blocking action is bad, and the roll surface cooling is fast, the hardness height.And thermal conductivity could guarantee the performance of the effect of heat insulation of thickness when 2-4mm less than 0.08 (w/m.k).
The boracic high-speed steel composite roll is in controlled cooling device, earlier by fog quenching processing parameter 1(P
Air=0.12～0.15MPa, P
Water=0.30～0.35MPa, Q
Water=1.65～1.80m
3/ h) spray cooling 5～6 minutes, the boracic high-speed steel composite roll adopts fog quenching processing parameter 1 spray cooling speed fast, helps promoting austenite to martensitic transformation, improves the roll depth of hardening zone, but, adopt fog quenching processing parameter 1 spray cooling overlong time, body of roll internal stress is big, easily germinates crackle, therefore, to adopt the 1 refrigerative time of fog quenching processing parameter to be controlled at 5～6 minutes, reduce speed of cooling then, use instead by fog quenching processing parameter 2(P
Air=0.45～0.55MPa, P
Water=0.05～0.07MPa, Q
Water=0.35～0.45m
3/ h) continue spray cooling boracic high-speed steel composite roll roll surface, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling, in order to avoid ftracture because of the roll internal stress is excessive.In the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, need again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces, otherwise roll surface temperature is too high, roll surface hardness descends obviously, can reduce the wear resistance of boron high-speed steel composite roller.The boracic high-speed steel composite roll is the measuring roller surface temperature in process of cooling, when roll surface temperature is lower than 160 ℃, stops spray cooling, realizes natural air cooling.So repeatedly, go up to be no more than 300 ℃, can stop spray cooling until roll surface temperature.Boracic high-speed steel composite roll air cooling carries out precision work to room temperature, can directly use on milling train then.Roll of the present invention is discharged by roll surface because of the roll centre heat, makes roll surface realize self-tempering, and roll of the present invention can directly use without temper after quenching.The roll internal stress is little, and is safe in utilization, reliable.
The present invention compared with prior art has the following advantages:
1, boracic high-speed steel composite roll roll surface hardness height of the present invention reaches 86～88HSD;
2, boracic high-speed steel composite roll roll surface uniformity of hardness of the present invention is good, and the roll surface difference of hardness is less than 2HSD;
3, boracic high-speed steel composite roll roll neck Hardness Control of the present invention is at 38～42HSD;
4, boracic high-speed steel composite roll roll neck intensity height of the present invention, good toughness improve 20～25% than thermal treatment process intensity commonly used, and toughness improves more than 35%;
5, boracic high-speed steel composite roll of the present invention can be cancelled tempering heat treatment, has the easy and high advantage of production efficiency of technology;
6, boracic high-speed steel composite roll wear resistance of the present invention is good, and long service life improves more than 60% than high-vanadium high-speed steel roller, improves more than 4 times than high Minvar roll.
Description of drawings
Fig. 1 composite roll cooling synoptic diagram;
The 1-roll neck, 2-lagging material, the 3-boracic high-speed steel body of roll, 4-magnesium iron spheroidal graphite cast iron roll centre, 5-controlled cooling device, 6-mist, gas water cooler.
Embodiment
The present invention improves to form on the basis of existing compound high speed steel roll.During existing compound high speed steel roll quenching heat treatment, roll is placed directly in heat treatment furnace internal heating and insulation, with postcooling the time, generally adopt air-cooled, mist is cold or the air cooling mode, to obtain the good martensitic stucture of wear resistance.Adopt air cooling or air-cooled, hardness is low and depth of hardening zone is shallow, causes roll to wear no resistance, and work-ing life is short.And directly adopt mist deepfreeze, roll surface to be prone to crackle, and roll neck hardness is too high, bearing easy to wear in the use, and mist when cold roll neck intensity low, poor toughness, roll is prone to roll breakage accident in using.
The boracic high-speed steel composite roll body of roll of the present invention adopts boracic high-speed steel, and roll centre adopts spheroidal graphite cast iron, and the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method.The concrete composition of body of roll boracic high-speed steel of the present invention (massfraction, %) as follows: 0.80 ~ 0.95C, 1.20 ~ 1.35B, 2.50 ~ 2.70Cr, 0.60 ~ 0.80V, 12.50 ~ 12.80W, 1.60 ~ 1.80Mo, 0.03 ~ 0.05K, 0.03 ~ 0.05Na, 0.04 ~ 0.06Ce, 0.04 ~ 0.06La, 0.025 ~ 0.035Ca, 0.025 ~ 0.035Ba, 0.12 ~ 0.15Mg, 0.04 ~ 0.06Zn, Si＜1.0, Mn＜0.60, S＜0.025, P＜0.035, Fe surplus, wherein 0.06＜K+Na＜0.10,0.08＜La+Ce＜0.12.
The thermal treatment of boracic high-speed steel composite roll of the present invention be at first with roll in process furnace internal heating to 1060～1080 ℃, insulation 4～6h.Roll is placed in the controlled cooling device (5) through insulation, and makes in the roll process of cooling speed rotation with 15～20rpm, helps roll roll surface (3) cooling evenly, and is favourable to the homogeneity that improves roll surface hardness.Simultaneously at roller neck (1) surface-coated lagging material (2), and roll neck (2) places controlled cooling device (5) in addition, can guarantee the roll neck cooling slowly, helps improving the roll neck obdurability, prevents that roll neck from fracture accident occurring in using.The thickness of roll lagging material of the present invention is at 2-4mm, and thermal conductivity is less than 0.08 (w/m.k), and thickness is between 2-4mm.
The boracic high-speed steel composite roll adopts mist, gas water cooler (6) in controlled cooling device (5), earlier by fog quenching processing parameter 1(P
Air=0.12～0.15MPa, P
Water=0.30～0.35MPa, Q
Water=1.65～1.80m
3/ h) spray cooling 5～6 minutes reduces speed of cooling then, uses instead by fog quenching processing parameter 2(P
Air=0.45～0.55MPa, P
Water=0.05～0.07MPa, Q
Water=0.35～0.45m
3/ h) continue spray cooling boracic high-speed steel composite roll roll surface, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.In the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, need again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces.The boracic high-speed steel composite roll is the measuring roller surface temperature in process of cooling, when roll surface temperature is lower than 160 ℃, stops spray cooling, realizes natural air cooling.So repeatedly, go up to be no more than 300 ℃, can stop spray cooling until roll surface temperature.Boracic high-speed steel composite roll air cooling carries out precision work to room temperature, can directly use on milling train then.
The present invention is described in further detail according to embodiment that technical scheme of the present invention is finished below in conjunction with accompanying drawing and contriver.These embodiment only are preferred embodiments of the present invention, but the present invention is not limited to these embodiment.
Embodiment 1:
With the body of roll (3) is that boracic high-speed steel, roll neck (1) and roll centre (4) are two kinds of materials of spheroidal graphite cast iron, become the boracic high-speed steel composite roll by centrifugal composite casting, after roughing, at process furnace internal heating to 1080 ℃, 4h is placed in the controlled cooling device (5) through insulation, and make in the roll process of cooling speed rotation with 20rpm, simultaneously at roller neck (1) surface-coated lagging material (2), and roll neck (1) places controlled cooling device (5) in addition.Lagging material (2) is that thermal conductivity is the CaO/SiO of 0.043 (w/m.k)
2, its thickness is 2mm.Adopt mist, gas water cooler (6), earlier by fog quenching processing parameter 1(P
Air=0.15MPa, P
Water=0.30MPa, Q
Water=1.65m
3/ h) spray cooling 6 minutes reduces speed of cooling then, uses instead by fog quenching processing parameter 2(P
Air=0.55MPa, P
Water=0.05MPa, Q
Water=0.35m
3/ h) continue spray cooling boracic high-speed steel composite roll roll surface, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.In the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, need again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces.The boracic high-speed steel composite roll is the measuring roller surface temperature in process of cooling, when roll surface temperature is lower than 160 ℃, stops spray cooling, realizes natural air cooling.So repeatedly, go up to be no more than 300 ℃, can stop spray cooling until roll surface temperature.Boracic high-speed steel composite roll air cooling carries out precision work to room temperature, can directly use on milling train then.The concrete composition of the composite roll body of roll sees Table 1, and the mechanical property of roll sees Table 2.
Embodiment 2:
With the body of roll (3) is that boracic high-speed steel, roll neck (1) and roll centre (4) are two kinds of materials of spheroidal graphite cast iron, become the boracic high-speed steel composite roll by centrifugal composite casting, after roughing, at process furnace internal heating to 1060 ℃, 6h is placed in the controlled cooling device (5) through insulation, and make in the roll process of cooling speed rotation with 15rpm, simultaneously at roller neck (1) surface-coated lagging material (2), and roll neck (1) places controlled cooling device (5) in addition.Lagging material (2) is that thermal conductivity is the woven asbesto of 0.069 (w/m.k), and its thickness is 4mm.Adopt mist, gas water cooler (6), earlier by fog quenching processing parameter 1(P
Air=0.12MPa, P
Water=0.35MPa, Q
Water=1.80m
3/ h) spray cooling 5 minutes reduces speed of cooling then, uses instead by fog quenching processing parameter 2(P
Air=0.45MPa, P
Water=0.07MPa, Q
Water=0.45m
3/ h) continue spray cooling boracic high-speed steel composite roll roll surface, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.In the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, need again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces.The boracic high-speed steel composite roll is the measuring roller surface temperature in process of cooling, when roll surface temperature is lower than 160 ℃, stops spray cooling, realizes natural air cooling.So repeatedly, go up to be no more than 300 ℃, can stop spray cooling until roll surface temperature.Boracic high-speed steel composite roll air cooling carries out precision work to room temperature, can directly use on milling train then.The concrete composition of the composite roll body of roll sees Table 1, and the mechanical property of roll sees Table 2.
Embodiment 3:
With the body of roll (3) is that boracic high-speed steel, roll neck (1) and roll centre (4) are two kinds of materials of spheroidal graphite cast iron, become the boracic high-speed steel composite roll by centrifugal composite casting, after roughing, at process furnace internal heating to 1070 ℃, 5h is placed in the controlled cooling device (5) through insulation, and make in the roll process of cooling speed rotation with 18rpm, simultaneously at roller neck (1) surface-coated lagging material (2), and roll neck (1) places controlled cooling device (5) in addition.Lagging material (2) is that thermal conductivity is the CaO/SiO of 0.043 (w/m.k)
2, its thickness is 2mm.Adopt mist, gas water cooler (6), earlier by fog quenching processing parameter 1(P
Air=0.13MPa, P
Water=0.32MPa, Q
Water=1.75m
3/ h) spray cooling 6 minutes reduces speed of cooling then, uses instead by fog quenching processing parameter 2(P
Air=0.50MPa, P
Water=0.067MPa, Q
Water=0.40m
3/ h) continue spray cooling boracic high-speed steel composite roll roll surface, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling.In the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, need again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces.The boracic high-speed steel composite roll is the measuring roller surface temperature in process of cooling, when roll surface temperature is lower than 160 ℃, stops spray cooling, realizes natural air cooling.So repeatedly, go up to be no more than 300 ℃, can stop spray cooling until roll surface temperature.Boracic high-speed steel composite roll air cooling carries out precision work to room temperature, can directly use on milling train then.The concrete composition of the composite roll body of roll sees Table 1, and the mechanical property of roll sees Table 2.
The concrete composition of the table 1 boracic high-speed steel composite roll body of roll (massfraction, %)
Table 2 boracic high-speed steel composite roll mechanical property
Boracic high-speed steel composite roll of the present invention has carried out industrial use examination on mill coil milling train and merchant bar mill, find that roll wear of the present invention is even, and the stocking surface quality is good, and the roll wear resistance is good, long service life.Non-cracking, cracking and peeling phenomenon occurred during roll used.Roll compares the high-vanadium high-speed steel roller raising more than 60% work-ing life, improves more than 4 times than high Minvar roll.Roll cancellation tempering heat treatment of the present invention has the easy and high advantage of production efficiency of technology.Dissemination boracic high-speed steel composite roll of the present invention has good economic benefits.
Claims (3)
1. the uniform boracic high-speed steel composite roll of roll surface hardness is characterized in that, the boracic high-speed steel composite roll body of roll adopts boracic high-speed steel, roll centre and roll neck adopt spheroidal graphite cast iron, and the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method, the concrete composition and the massfraction % of body of roll boracic high-speed steel are as follows: 0.80～0.95C, 1.20～1.35B, 2.50～2.70Cr, 0.60～0.80V, 12.50～12.80W, 1.60～1.80Mo, 0.03～0.05K, 0.03～0.05Na, 0.04～0.06Ce, 0.04～0.06La, 0.025～0.035Ca, 0.025～0.035Ba, 0.12～0.15Mg, 0.04～0.06Zn, Si＜1.0, Mn＜0.60, S＜0.025, P＜0.035, Fe surplus, 0.06＜K+Na＜0.10,0.08＜La+Ce＜0.12 wherein.
2. the manufacture method of the uniform boracic high-speed steel composite roll of the described a kind of roll surface hardness of claim 1 is characterized in that, may further comprise the steps:
(1), the boracic high-speed steel composite roll body of roll adopts boracic high-speed steel, roll centre and roll neck adopt spheroidal graphite cast iron, the body of roll and roll centre are realized metallurgical binding by the centrifugal composite casting method;
(2), at first with the boracic high-speed steel composite roll in process furnace internal heating to 1060～1080 ℃, be placed in the controlled cooling device through being incubated 4～6h, and make in the roll process of cooling speed rotation with 15～20rpm, apply lagging material at roller neck surface simultaneously, and roll neck places beyond the controlled cooling device;
(3), the boracic high-speed steel composite roll in controlled cooling device, earlier by fog quenching technology 1 spray cooling 5～6 minutes, the parameter of fog quenching technology 1: P
Air=0.12～0.15MPa, P
Water=0.30～0.35MPa, Q
Water=1.65～1.80m
3/ h; By fog quenching technology 2, continue spray cooling boracic high-speed steel composite roll roll surface, the parameter of fog quenching technology 2: P then
Air=0.45～0.55MPa, P
Water=0.05～0.07MPa, Q
Water=0.35～0.45m
3/ h, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling;
(4), in the boracic high-speed steel composite roll natural air cooling process, the heat of roll centre can shed by roll surface, cause roll surface temperature to go up, and make roll surface generation self-tempering phenomenon, when roll surface temperature gos up to more than 300 ℃ the time, again by fog quenching processing parameter 2 spray cooling boracic high-speed steel composite roll roll surfaces, and in process of cooling the measuring roller surface temperature, when roll surface temperature is lower than 160 ℃, stop spray cooling, realize natural air cooling; So repeatedly, go up to be no more than 300 ℃ until roll surface temperature, can stop spray cooling, the roll surface air cooling carries out precision work to room temperature.
3. according to the method for claim 2, it is characterized in that the thickness of lagging material is at 2-4mm, thermal conductivity is less than 0.08W/m.k.
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| CN103805902A (en) * | 2014-03-11 | 2014-05-21 | 唐山联强冶金轧辊有限公司 | Process for manufacturing centrifugally-cast easy-cutting high-speed steel roll |
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| US5355932A (en) * | 1992-03-06 | 1994-10-18 | Hitachi Metals, Ltd. | Method of producing a compound roll |
| CN100485075C (en) * | 2007-04-03 | 2009-05-06 | 西安交通大学 | High-carbon high-vanadium high-speed steel composite roller and heat treatment method thereof |
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| CN103805902A (en) * | 2014-03-11 | 2014-05-21 | 唐山联强冶金轧辊有限公司 | Process for manufacturing centrifugally-cast easy-cutting high-speed steel roll |
| CN103805902B (en) * | 2014-03-11 | 2015-09-30 | 唐山联强冶金轧辊有限公司 | A kind of Cutting free high-speed steel roll manufacturing process of rotary casting |
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