CN105821296A - High-chromium alloy iron roll and preparation method thereof - Google Patents
High-chromium alloy iron roll and preparation method thereof Download PDFInfo
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- CN105821296A CN105821296A CN201610354905.8A CN201610354905A CN105821296A CN 105821296 A CN105821296 A CN 105821296A CN 201610354905 A CN201610354905 A CN 201610354905A CN 105821296 A CN105821296 A CN 105821296A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a high-chromium alloy iron roll and a preparation method thereof. The roll is composed of a high-chromium alloy cast iron work layer and a nodular cast iron roll core. The work layer comprises the elements of, by mass percentage, 2.6-2.8% of C, 0.5-0.9% of Si, 0.3-0.8% of Mn, 20-22% of Cr, 0.6-1.5% of Ni, 0.2-0.3% of Mo, 0.2-0.4% of Cu, 0.001-0.003% of B, 0.1-0.6% of V, 0.01-0.03% of RE, less than 0.05% of P, less than 0.05% of S and the balance iron. The work layer and the roll core are compounded in a centrifugal machine casting mode, and the high-chromium alloy iron roll is prepared through sub-critical heat treatment. The high-chromium alloy iron roll has good abrasion resistance, tenacity and heat crack resistance, the service life of the roll is prolonged, the heat treatment temperature is low, and energy saving and environment protection are achieved.
Description
Technical field
The present invention relates to a kind of roll, particularly to a kind of high-chromium alloy cast-iron roll and preparation method thereof, belong to roll manufacturing technology field.
Background technology
Roll is the main consumption spare part in Rolling production, and its quality directly influences the surface quality of stocking and the production cost of stocking, and raising roll quality, reduction roll cost are always the problem that roll manufacturing enterprise pays close attention to.The most conventional roll material has high nickel chromium triangle infinitely chilled ductile cast iron, half steel, high-chromium white cast iron and high carbon high-speed steel etc..High Ni-Cr infinite cold hardness cast iron roll fragility is big, and ferrosteel roll hardness is low, wear no resistance, although high carbon high-speed steel hardness is high, wearability is good, however it is necessary that the ferroalloys such as the more tungsten of addition, molybdenum, vanadium, niobium, causes the huge waste of resource.There is the M7C3 type carbide of high rigidity in high-chromium alloy cast-iron roll after heat treatment microscopic structure, isolated distribution, therefore has higher wearability each other.But, the high-chromium alloy cast-iron roll of prior art there is also following deficiency: first, and hot-cracking resistance is poor, and the body of roll easily cracks and peels off, and affects the service life of roll；Second, roll generally uses destabilized treatment to add temper, there is thermal stress, is easily deformed and ftractures, and reduces the service life of roll, and, the temperature of destabilized treatment is the highest, needs to consume the substantial amounts of energy, be also unfavorable for environmental protection in production.
Summary of the invention
The present invention provides a kind of high-chromium alloy cast-iron roll, V, B, Cu and RE element is added at high-chromium alloy cast-iron roll working lining, composite centrifugal casting also obtains high-chromium alloy cast-iron roll through subcritical heat-treat-ment, there is good wearability and toughness, serviceability is good, and heat crack resistance is good, extends the service life of roll, heat treatment temperature is low, energy-conserving and environment-protective.
The present invention, for realizing above-mentioned technical purpose, adopts the following technical scheme that.
A kind of high-chromium alloy cast-iron roll, including high-chromium alloy cast-iron working lining and spheroidal graphite cast-iron roller core, the chemical element component of high-chromium alloy cast-iron working lining and weight/mass percentage composition thereof be: C:2.6～2.8%, Si:0.5～0.9%, Mn:0.3～0.8%, Cr:20～22%, Mo:0.2～0.3%, Ni:0.6～1.5%, Cu:0.2～0.4%, B:0.001～0.003%, V:0.1～0.6%, RE:0.01～0.03%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The preparation method of high-chromium alloy cast-iron roll, it comprises the following steps:
Step one, melting
The melting of high-chromium alloy cast-iron working lining molten iron, the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1530～1600 DEG C, and it is quenched to add RE refine, after adjusting component is qualified, obtain high-chromium alloy cast-iron working lining molten iron.
The melting of ductile cast iron roller core iron water, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1440～1500 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.5～0.9%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.1～1.6%；
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed >=1000r/min.
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1530～1600 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1220～1250 DEG C, carry out casting for the first time, cast temperature is 1390～1410 DEG C, and casting quality is 1/3rd of spheroidal graphite cast-iron roller core gross mass, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1150～1170 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1390～1410 DEG C.
Cast and complete obtain molding roller.
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 540～600 DEG C with the speed of 9～13 DEG C/h in air, after insulation 8～15h, be cooled to room temperature, obtain high-chromium alloy cast-iron roll in air.
In the present invention, chemical element component and the weight/mass percentage composition thereof of high-chromium alloy cast-iron working lining determine according to following principle.
C:C can form the high rigidity carbide that wearability is good, but too much C can increase the fragility of cast iron, considers above-mentioned factor, C element is controlled 2.6～2.8% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
The addition of Si:Si element is possible to prevent other alloying element of high-chromium alloy cast-iron working lining to aoxidize, but, Si element is also the formation element of non-carbide, the quenching degree of high-chromium alloy cast-iron working lining can be reduced, consider above-mentioned factor, Si element is controlled 0.5～0.9% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
The existence of Mn:Mn element can expand the austenite phase field in high-chromium alloy cast-iron working lining, the quenching degree of high-chromium alloy cast-iron working lining can be improved simultaneously, but, too much Mn can reduce the heat crack resistance of high-chromium alloy cast-iron working lining, consider above-mentioned factor, Mn element is controlled 0.3～0.8% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
Cr:Cr element is possible not only to increase the wearability of high-chromium alloy cast-iron working lining; also quenching degree and the non-oxidizability of high-chromium alloy cast-iron working lining matrix can be improved; but; Cr constituent content is too high; its protectiveness can decline; consider above-mentioned factor, Cr element is controlled 20～22% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
The existence in high-chromium alloy cast-iron working lining of the Mo:Mo element can increase the chemical stability of carbide, and the high temperature abrasion resistance of high-chromium alloy cast-iron working lining can be improved, but it is on the high side, amid all these factors, Mo element is controlled 0.2～0.3% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
The existence in high-chromium alloy cast-iron working lining of the Ni:Ni element can promote the formation of austenite in high-chromium alloy cast-iron working lining, improve its creep resisting ability, and, with element synergism such as Cr, the Mo in high-chromium alloy cast-iron working lining, calorific intensity and the thermal fatigue strength of high-chromium alloy cast-iron working lining can be greatly improved, but on the high side, amid all these factors, Ni element is controlled 0.6～1.5% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
Cu: add Cu element in high-chromium alloy cast-iron working lining, its corrosion resistance can be improved, improve its intensity and toughness simultaneously, but, the membership that adds of excess Cu element causes the generation of micro-crack, consider above-mentioned factor, Cu element is controlled 0.2～0.4% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
B:B element can improve quenching degree, strengthening the wearability of high-chromium alloy cast-iron, anti-strip ability is good, but too much B can cause fragility to increase, consider above-mentioned factor, B element is controlled 0.001～0.003% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
V:VC is highly stable, and has the highest hardness, and its microhardness is up to HV2400, and its addition makes the martensite content of high-chromium alloy cast-iron working lining increase, and therefore, the addition of V element can improve the hardness of high-chromium alloy cast-iron working lining.Meanwhile, the addition of V can contribute to being formed the carbide of isolated distribution with refined carbides crystal grain, reduce the content of net carbide, therefore can improve the combination property of high-chromium alloy cast-iron working lining.But, the thermostability of high-chromium alloy cast-iron can be had a negative impact when V element content height, therefore, in the present invention, V is 0.5～3.0% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
RE:RE adds high-chromium alloy cast-iron working lining as alterant is compound, can crystal grain thinning further, purify crystal boundary, as cast condition eutectic carbide especially can be made to become strip and block or pelletizing shape, while obtaining high rigidity, improve the impact flexibility of high-chromium alloy cast-iron working lining.In the present invention, RE is 0.01～0.03% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
S and P: as impurity element, S and P element are controlled below 0.05% at the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
Reasonably Technology for Heating Processing can eliminate the internal stress that high-chromium alloy cast-iron roll produces in cooling procedure, and the matrix of high-chromium alloy cast-iron working lining and carbide can be made to be improved, thus obtain that wearability is good, the high-chromium alloy cast-iron roll of high comprehensive performance.Therefore, Technology for Heating Processing is also the key factor obtaining high-chromium alloy cast-iron roll of good performance.The Technology for Heating Processing that high-chromium alloy cast-iron roll generally uses at present is that destabilized treatment adds temper, destabilized treatment can produce thermal stress, is easily caused high-chromium alloy cast-iron working lining and cracks and ftracture, and, high destabilized treatment temperature also can consume the substantial amounts of energy, is unfavorable for environmental protection.And subcritical heat-treat-ment temperature is low, being conducive to saving roll production cost, and energy-conserving and environment-protective, subcritical heat-treat-ment can make the austenite generation martensitic that high-chromium alloy cast-iron cast iron roll in as-cast exists, but will not change the quantity of carbide, form and distribution.
The high-chromium alloy cast-iron working lining of the present invention adds V element, can be with the crystal grain of refined carbides, contribute to the formation of the carbide of small and dispersed distribution, reduce the content of net carbide, meanwhile, add RE element as alterant, further crystal grain thinning, purify crystal boundary, it is possible to make eutectic carbide Dispersed precipitate.The addition of both the above element so that high-chromium alloy cast-iron working lining i.e. defines the carbide of Flos Chrysanthemi flap Dispersed precipitate in as cast condition.
On the basis of the above, the present invention uses subcritical heat-treat-ment technique, and with the speed of 9～13 DEG C/h, high-chromium alloy cast-iron roll is heated to 540～600 DEG C, after insulation 8～15h, is cooled to room temperature in air.This heat treatment mode carbide morphology to high-chromium alloy cast-iron roll working lining, quantity and distribution not impact, but there is martensite transfor mation in cooling procedure in the austenite that can make as cast condition, it is martensite by Transformation of Retained Austenite more in as cast condition, having obtained martensite is matrix, residual austenite content is 8～15%, carbide is the tissue that daisy_petal part shape isolates distribution, the existence of carbide and martensite improves high hardness, the existence of retained austenite can stop the extension of crackle to provide good toughness, therefore the high-chromium alloy cast-iron working lining that the present invention provides is while having good wearability, there is good toughness, the most easy to crack, heat crack resistance is good.
And, due to the fact that and avoid the destabilized treatment that temperature is higher, reduce the thermal stress of high-chromium alloy cast-iron roll, reduce further the generation of micro-crack, improve the anti-strip ability of high-chromium alloy cast-iron roll.
Simultaneously as containing Mo, Cu element in high-chromium alloy cast-iron working lining, high-chromium alloy cast-iron working lining can be made to produce post-curing during subcritical heat-treat-ment, improve the wearability of high-chromium alloy cast-iron working lining further.
The present invention use technique scheme obtain following technique effect:
1, the high-chromium alloy cast-iron roll that the present invention provides, by to high-chromium alloy cast-iron working lining element and the selection of weight/mass percentage composition thereof and control, obtain that there is good wearability, there is the high-chromium alloy cast-iron roll of preferable toughness, corrosion resistance and hot-cracking resistance simultaneously, improve 1.4 times the service life of high-chromium alloy cast-iron roll.
2, the high-chromium alloy cast-iron roll that the present invention provides, adds V and RE element in high-chromium alloy cast-iron working lining, obtained as cast condition i.e. small and dispersed distribution carbide in the base.With this understanding, using subcritical heat-treat-ment technique, having obtained martensite is matrix, and residual austenite content is 8～15%, and eutectic carbide is the tissue that daisy_petal part shape isolates distribution.High-chromium alloy cast-iron roll not only hardness after heat treatment is high, and good toughness, the most easy to crack, extend the service life of roll.
3, containing Mo, Cu element in the high-chromium alloy cast-iron roll working lining that the present invention provides, high-chromium alloy cast-iron working lining can be made to produce post-curing during subcritical heat-treat-ment, improve hardness and the wearability of high-chromium alloy cast-iron working lining further.
4, the present invention is by using subcritical heat-treat-ment to high-chromium alloy cast-iron roll, avoid conventional destabilized treatment and add temper technique, not only reduce the cost of high-chromium alloy cast-iron roll, improve the working condition of workman, also save the energy, beneficially energy-conserving and environment-protective simultaneously.
Detailed description of the invention
Hereinafter the technical scheme of the high-chromium alloy cast-iron roll that the present invention provides is conducted further description, make those skilled in the art can be better understood from the present invention and can be practiced.
Embodiment 1
Step one, melting
High-chromium alloy cast-iron working lining is according to following proportion ingredient: C:2.6%, Si:0.5%, Mn:0.3%, Cr:20%, Mo:0.2%, Ni:0.6%, Cu:0.2%, B:0.001%, V:0.1%, RE:0.01%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
Adding the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron smelting temperature according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace is 1530 DEG C, and adding RE, to carry out refine quenched, after adjusting component is qualified, obtain high-chromium alloy cast-iron working lining molten iron.
The melting of spheroidal graphite cast-iron roller core, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1440 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.5%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.1%.
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed 1000r/min.
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1530 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1220 DEG C, carry out casting for the first time, cast temperature is 1390 DEG C, and casting quality is 1/3rd of the gross mass of spheroidal graphite cast-iron roller core, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1150 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1390 DEG C.
Cast and complete obtain molding roller.
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 540 DEG C with the speed of 9 DEG C/h in air, after insulation 8h, be cooled to room temperature, obtain high-chromium alloy cast-iron roll in air.
Embodiment 2
Step one, melting
High-chromium alloy cast-iron working lining is according to following proportion ingredient: C:2.7%, Si:0.7%, Mn:0.5%, Cr:21%, Mo:0.25%, Ni:0.8%, Cu:0.3%, B:0.002%, V:0.3%, RE:0.02%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1550 DEG C, and adding RE, to carry out refine quenched, after adjusting component is qualified, obtain high-chromium alloy cast-iron working lining molten iron.
The melting of spheroidal graphite cast-iron roller core, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1450 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.6%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.2%.
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed 1200r/min.
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1550 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1230 DEG C, carry out casting for the first time, cast temperature is 1400 DEG C, and casting quality is 1/3rd of the gross mass of spheroidal graphite cast-iron roller core, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1160 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1400 DEG C.
Cast and complete obtain molding roller.
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 550 DEG C with the speed of 10 DEG C/h in air, after insulation 10h, be cooled to room temperature, obtain high-chromium alloy cast-iron roll in air.
Embodiment 3
Step one, melting
High-chromium alloy cast-iron working lining is according to following proportion ingredient: C:2.74%, Si:0.73%, Mn:0.56%, Cr:21.5%, Mo:0.26%, Ni:1.14%, Cu:0.3%, B:0.002%, V:0.37%, RE:0.024%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1570 DEG C, and adding RE, to carry out refine quenched, i.e. obtains high-chromium alloy cast-iron working lining molten iron after adjusting component is qualified.
The melting of spheroidal graphite cast-iron roller core, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1480 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.7%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.4%.
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed 1300r/min.
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1570 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1235 DEG C, carry out casting for the first time, cast temperature is 1400 DEG C, and casting quality is 1/3rd of the gross mass of spheroidal graphite cast-iron roller core, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1160 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1400 DEG C.
Cast and complete obtain molding roller.
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 580 DEG C with the speed of 11 DEG C/h in air, after insulation 12h, be cooled to room temperature in air.
Embodiment 4
Step one, melting
High-chromium alloy cast-iron working lining is according to following proportion ingredient: C:2.7%, Si:0.8%, Mn:0.7%, Cr:21%, Mo:0.25%, Ni:1.2%, Cu:0.3%, B:0.002%, V:0.5%, RE:0.02%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1580 DEG C, and adding RE, to carry out refine quenched, after adjusting component is qualified, obtain high-chromium alloy cast-iron working lining molten iron.
The melting of spheroidal graphite cast-iron roller core, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1490 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.8%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.5%.
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed 1400r/min；
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1580 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1240 DEG C, carry out casting for the first time, cast temperature is 1400 DEG C, and casting quality is 1/3rd of the gross mass of spheroidal graphite cast-iron roller core, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1160 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1400 DEG C.
Cast and complete obtain molding roller；
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 590 DEG C with the speed of 12 DEG C/h in air, after insulation 13h, be cooled to room temperature, obtain high-chromium alloy cast-iron roll in air.
Embodiment 5
Step one, melting
High-chromium alloy cast-iron working lining is according to following proportion ingredient: C:2.8%, Si:0.9%, Mn:0.8%, Cr:22%, Mo:0.3%, Ni:1.5%, Cu:0.4%, B:0.003%, V:0.6%, RE:0.03%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1600 DEG C, and it is quenched to add RE refine, i.e. obtains high-chromium alloy cast-iron working lining molten iron after adjusting component is qualified.
The melting of spheroidal graphite cast-iron roller core, smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature is 1500 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, i.e. obtains ductile cast iron roller core iron water after adjusting component is qualified.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.9%, and nodulizer is yttrium-base heavy rare earth, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.6%.
Step 2, composite centrifugal casting
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed 1500r/min.
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron molten iron in centrifuge casting mold, and cast temperature is 1600 DEG C；
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1250 DEG C, carry out casting for the first time, cast temperature is 1410 DEG C, and casting quality is 1/3rd of spheroidal graphite cast-iron roller core gross mass, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1170 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1410 DEG C.
Cast and complete obtain molding roller.
Step 3: heat treatment
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 600 DEG C with the speed of 13 DEG C/h in air, after insulation 15h, be cooled to room temperature, obtain high-chromium alloy cast-iron roll in air.
Table 1 is hardness and the impact flexibility test result of the high-chromium alloy cast-iron roll of embodiment 1～5.
Table 1 high-chromium alloy cast-iron roller performance
The hardness of the high-chromium alloy cast-iron roll of embodiment 1～5 and impact flexibility test result show that the high-chromium alloy cast-iron roll that the present invention provides not only has high hardness, and have good impact flexibility.Roll working lining is not susceptible to crackle and cracking, extends the service life of roll.Through experiment, the service life of the high-chromium alloy cast-iron roll that the present invention provides improves 1.4 times than the roll of prior art.
High-chromium alloy cast-iron roll that the present invention provides and preparation method thereof, is not restricted to the described embodiments, every method utilizing the present invention, through the technical scheme that conversion and replacement are formed, the most within the scope of the present invention.
Claims (2)
1. a high-chromium alloy cast-iron roll, including high-chromium alloy cast-iron working lining and spheroidal graphite cast-iron roller core, it is characterized in that: chemical element component and the weight/mass percentage composition thereof of described high-chromium alloy cast-iron working lining be: C:2.6～2.8%, Si:0.5～0.9%, Mn:0.3～0.8%, Cr:20～22%, Mo:0.2～0.3%, Ni:0.6～1.5%, Cu:0.2～0.4%, B:0.001～0.003%, V:0.1～0.6%, RE:0.01～0.03%, S:＜ 0.05%, P:＜ 0.05%, surplus is Fe.
The preparation method of high-chromium alloy cast-iron roll the most according to claim 1, it is characterised in that comprise the following steps:
Step one, melting:
The melting of high-chromium alloy cast-iron working lining molten iron, the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron is added according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining in intermediate frequency furnace, smelting temperature is 1530～1600 DEG C, and it is quenched to add RE refine, after adjusting component is qualified, obtain high-chromium alloy cast-iron working lining molten iron；
The melting of ductile cast iron roller core iron water, the smelting temperature of spheroidal graphite cast-iron roller core is 1440～1500 DEG C, and to its addition nodulizer and inovulant, it is carried out nodularization and inoculation, obtain ductile cast iron roller core iron water, described inovulant is silicon barium, described inovulant weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.5～0.9%, and described nodulizer is yttrium-base heavy rare earth, and described nodulizer weight/mass percentage composition in spheroidal graphite cast-iron roller core is 1.1～1.6%；
Step 2, composite centrifugal casting:
Use horizontal centrifuge casting high-chromium alloy cast-iron roll, horizontal centrifuge rotating speed >=1000r/min；
Casting high-chromium alloy cast-iron working lining, injects high-chromium alloy cast-iron working lining molten iron in centrifuge casting mold, and cast temperature is 1530～1600 DEG C；
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core is cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cooled to 1220～1250 DEG C, carry out casting for the first time, cast temperature is 1390～1410 DEG C, and casting quality is 1/3rd of spheroidal graphite cast-iron roller core gross mass, when the spheroidal graphite cast-iron roller core temperature cast for the first time is cooled to 1150～1170 DEG C, the ductile cast iron roller core iron water of casting surplus, cast temperature is 1390～1410 DEG C；
Cast and complete obtain molding roller；
Step 3, heat treatment:
The molding roller demoulding that will obtain in step 2, is cooled to room temperature, is then heated to 540～600 DEG C with the speed of 9～13 DEG C/h in air, after insulation 8～15h, be cooled to room temperature, obtain described high-chromium alloy cast-iron roll in air.
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