CN105821296B - A kind of high-chromium alloy cast-iron roll and preparation method thereof - Google Patents
A kind of high-chromium alloy cast-iron roll and preparation method thereof Download PDFInfo
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- CN105821296B CN105821296B CN201610354905.8A CN201610354905A CN105821296B CN 105821296 B CN105821296 B CN 105821296B CN 201610354905 A CN201610354905 A CN 201610354905A CN 105821296 B CN105821296 B CN 105821296B
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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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- 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 present invention provides a kind of high-chromium alloy cast-iron roll and preparation method thereof, roll is made up of high-chromium alloy cast-iron working lining and spheroidal graphite cast-iron roller core, the element and its weight/mass percentage composition of working lining are 2.6~2.8%C, 0.5~0.9%Si, 0.3~0.8%Mn, 20~22%Cr, 0.6~1.5%Ni, 0.2~0.3%Mo, 0.2~0.4%Cu, 0.001~0.003%B, 0.1~0.6%V, 0.01~0.03%RE, ＜ 0.05% P and ＜ 0.05% S, surplus is iron, with the compound working lining of centrifuge casting mode and roller core, high-chromium alloy cast-iron roll is prepared into by subcritical heat-treat-ment.The high-chromium alloy cast-iron roll of the present invention, has good wearability and toughness, heat crack resistance is good, extends the service life of roll, and heat treatment temperature is low, energy-conserving and environment-protective.
Description
Technical field
The present invention relates to a kind of roll, more 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 and stocking of stocking
Production cost, improve roll quality, reduce the problem that roll cost is always the concern of roll manufacturing enterprise.Currently used 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 nickel chromium triangle infinitely chilled ductile cast iron rolls
Roller fragility is big, and ferrosteel roll hardness is low, wears no resistance, although high carbon high-speed steel hardness is high, wearability is good, need add compared with
The ferroalloys such as more tungsten, molybdenum, vanadium, niobium, cause the huge waste of resource.After heat treatment micro- group of high-chromium alloy cast-iron roll
The middle M7C3 type carbide that high rigidity be present is knitted, isolates distribution each other, therefore there is higher wearability.But prior art
High-chromium alloy cast-iron roll also have the following disadvantages：First, hot-cracking resistance is poor, and the body of roll is easily cracked and peeled off, shadow
Ring the service life of roll；Second, roll generally use destabilized treatment adds temper, thermal stress be present, is easily deformed and opens
Split, reduce the service life of roll, moreover, the temperature of destabilized treatment is very high, need to consume the substantial amounts of energy in production, it is also unfavorable
In environmental protection.
The content of the invention
The present invention provides a kind of high-chromium alloy cast-iron roll, and V, B, Cu and RE are added in high-chromium alloy cast-iron roll working lining
Element, composite centrifugal, which casts and passes through subcritical heat-treat-ment, obtains high-chromium alloy cast-iron roll, has good wearability and tough
Property, performance is good, and heat crack resistance is good, extends the service life of roll, and heat treatment temperature is low, energy-conserving and environment-protective.
The present invention adopts the following technical scheme that to realize above-mentioned technical purpose.
A kind of high-chromium alloy cast-iron roll, including high-chromium alloy cast-iron working lining and spheroidal graphite cast-iron roller core, high-chromium alloy casting
The chemical element component and its weight/mass percentage composition of 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 Fe.
The preparation method of high-chromium alloy cast-iron roll, it comprises the following steps：
Step 1, melting
The melting of high-chromium alloy cast-iron working lining molten iron, according to the member of high-chromium alloy cast-iron working lining in intermediate frequency furnace
Plain weight/mass percentage composition adds the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, melts
Refine temperature be 1530~1600 DEG C, and add RE refining it is quenched, after adjusting component is qualified, produce high-chromium alloy cast-iron working lining iron
Water.
The melting of ductile cast iron roller core iron water, smelting nodular cast iron roller core molten iron, smelting temperature are in intermediate frequency furnace
1440~1500 DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, after adjusting component is qualified i.e.
Obtain ductile cast iron roller core iron water.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.5~0.9%, ball
Agent 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, casting
Temperature is 1530~1600 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1220~1250 DEG C, carries out first time casting, and cast temperature is 1390~1410 DEG C, and casting quality is spheroidal graphite cast-iron
/ 3rd of roller core gross mass, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1150~1170 DEG C, casting
The ductile cast iron roller core iron water of surplus, cast temperature are 1390~1410 DEG C.
Casting finishes to obtain molding roller.
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then added with 9~13 DEG C/h speed
Heat after being incubated 8~15h, is cooled to room temperature, produces high-chromium alloy cast-iron roll to 540~600 DEG C in air.
The chemical element component of high-chromium alloy cast-iron working lining and its weight/mass percentage composition are according to following principle in the present invention
It is determined that.
C：C can form the good high rigidity carbide of wearability, but excessive C can increase the fragility of cast iron, and synthesis is examined
Consider above-mentioned factor, weight/mass percentage composition of the C element in high-chromium alloy cast-iron working lining is controlled 2.6~2.8%.
Si：The addition of Si elements can prevent other alloying elements of high-chromium alloy cast-iron working lining from aoxidizing, still, Si members
The formation element of element and non-carbide, can reduce the quenching degree of high-chromium alloy cast-iron working lining, consider above-mentioned factor, will
Si elements are controlled 0.5~0.9% in the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
Mn：The presence of Mn elements can expand the austenite phase field in high-chromium alloy cast-iron working lining, while can improve
The quenching degree of high-chromium alloy cast-iron working lining, however, excessive Mn can reduce the heat crack resistance of high-chromium alloy cast-iron working lining,
Consider above-mentioned factor, weight/mass percentage composition of the Mn elements in high-chromium alloy cast-iron working lining is controlled 0.3~0.8%.
Cr：Cr elements can not only increase the wearability of high-chromium alloy cast-iron working lining, can also improve high-chromium alloy cast-iron
The quenching degree and inoxidizability of working lining matrix, however, Cr constituent contents are too high, its protectiveness can decline, and consider above-mentioned
Factor, weight/mass percentage composition of the Cr elements in high-chromium alloy cast-iron working lining is controlled 20~22%.
Mo：Presence of the Mo elements in high-chromium alloy cast-iron working lining 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, by Mo elements in Gao Ge
The weight/mass percentage composition of alloy cast iron working lining is controlled 0.2~0.3%.
Ni：Presence of the Ni elements in high-chromium alloy cast-iron working lining can promote Ovshinsky in high-chromium alloy cast-iron working lining
The formation of body, its creep resisting ability is improved, moreover, acted synergistically with elements such as Cr, Mo in high-chromium alloy cast-iron working lining, can
To greatly improve the calorific intensity of high-chromium alloy cast-iron working lining and thermal fatigue strength, but it is on the high side, amid all these factors, by Ni
Element is controlled 0.6~1.5% in the weight/mass percentage composition of high-chromium alloy cast-iron working lining.
Cu：Cu elements are added in high-chromium alloy cast-iron working lining, its corrosion resistance can be improved, while improve its intensity
And toughness, however, the addition of excessive Cu elements can cause the generation of micro-crack, above-mentioned factor is considered, by Cu elements in height
The weight/mass percentage composition of chrome alloy cast iron working lining is controlled 0.2~0.4%.
B：B element can improve quenching degree, strengthen the wearability of high-chromium alloy cast-iron, and anti-strip ability is good, but excessively
B fragility can be caused to increase, consider above-mentioned factor, by B element high-chromium alloy cast-iron working lining weight/mass percentage composition
Control is 0.001~0.003%.
V：VC is highly stable, and possesses very high hardness, and its microhardness is up to HV2400, and it adds and high chromium is closed
The martensite content increase of golden cast iron working lining, therefore, the addition of V element can improve the hard of high-chromium alloy cast-iron working lining
Degree.Meanwhile V addition can be helped to form the carbide of isolated distribution, reduced net carbide with refined carbides crystal grain
Content, therefore the combination property of high-chromium alloy cast-iron working lining can be improved.But high chromium can be closed when V element content is high
The heat resistance of golden cast iron has a negative impact, and therefore, V is in the weight/mass percentage composition of high-chromium alloy cast-iron working lining in the present invention
0.5~3.0%.
RE：RE adds high-chromium alloy cast-iron working lining as alterant is compound, can further crystal grain thinning, purification is brilliant
It boundary, as cast condition eutectic carbide is changed into strip and block or pelletizing shape, Gao Ge is improved while high rigidity is obtained
The impact flexibility of alloy cast iron working lining.In the present invention RE the weight/mass percentage composition of high-chromium alloy cast-iron working lining for 0.01~
0.03%.
S and P：As impurity element, S and P element are existed in the weight/mass percentage composition control of high-chromium alloy cast-iron working lining
Less than 0.05%.
Rational Technology for Heating Processing can eliminate high-chromium alloy cast-iron roll caused internal stress in cooling procedure, and
The matrix and carbide that high-chromium alloy cast-iron working lining can be made are improved, and so as to obtain, wearability is good, combination property is excellent
Good high-chromium alloy cast-iron roll.Therefore, Technology for Heating Processing is also the important of acquisition high-chromium alloy cast-iron roll of good performance
Factor.The Technology for Heating Processing of high-chromium alloy cast-iron roll generally use is that destabilized treatment adds temper, destabilized treatment meeting at present
Thermal stress is produced, easily causes high-chromium alloy cast-iron working lining to crack and ftracture, moreover, high destabilized treatment temperature also can
The substantial amounts of energy is consumed, is unfavorable for environmental protection.And subcritical heat-treat-ment temperature is low, be advantageous to save roll production cost, and save
Environmental protection, subcritical heat-treat-ment can make austenite existing for high-chromium alloy cast-iron cast iron roll in as-cast that martensitic occur, still
The quantity, form and distribution of carbide will not be changed.
V element is added in the high-chromium alloy cast-iron working lining of the present invention, can be contributed to tiny with the crystal grain of refined carbides
The formation of the carbide of Dispersed precipitate, the content of net carbide is reduced, meanwhile, RE elements are added as alterant, further
Crystal grain thinning, crystal boundary is purified, eutectic carbide Dispersed precipitate can be made.The addition of both the above element so that high-chromium alloy is cast
Iron working lining is to form the carbide of chrysanthemum flap Dispersed precipitate in as cast condition.
On the basis of the above, the present invention uses subcritical heat-treat-ment technique, by high-chromium alloy cast-iron roll with 9~13 DEG C/h
Speed be heated to 540~600 DEG C, after being incubated 8~15h, room temperature is cooled in air.This heat treatment mode is to high-chromium alloy
Carbide morphology, quantity and the distribution of grain roll working lining do not influence, but can make the austenite of as cast condition in cooling procedure
Middle generation martensite transfor mation, it is martensite by Transformation of Retained Austenite more in as cast condition, it is matrix to have obtained martensite, remaining
Austenite content is 8~15%, and in the tissue of the isolated distribution of daisy_petal part shape, the presence of carbide and martensite improves carbide
High hardness, the presence of retained austenite can prevent the extension of crackle from providing good toughness, therefore the present invention provides
High-chromium alloy cast-iron working lining while with good wearability, there is good toughness, not easy to crack, hot-cracking resistance
Can be good.
Moreover, the destabilized treatment that the present invention is higher due to avoiding temperature, the heat for reducing high-chromium alloy cast-iron roll should
Power, the generation of micro-crack is reduce further, 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 exist
Post-curing is produced during subcritical heat-treat-ment, further improves the wearability of high-chromium alloy cast-iron working lining.
The present invention obtains following technique effect using above-mentioned technical proposal：
1st, high-chromium alloy cast-iron roll provided by the invention, by high-chromium alloy cast-iron working lining element and its quality hundred
Divide the selection and control of content, obtain that there is good wearability, while there is preferable toughness, corrosion resistance and hot-cracking resistance
High-chromium alloy cast-iron roll, the service life of high-chromium alloy cast-iron roll improves 1.4 times.
2nd, high-chromium alloy cast-iron roll provided by the invention, V and RE elements is added in high-chromium alloy cast-iron working lining, are obtained
As cast condition is the carbide of small and dispersed distribution in the base.On this condition, using subcritical heat-treat-ment technique, horse has been obtained
Family name's body is matrix, residual austenite content 8~15%, eutectic carbide in the isolated distribution of daisy_petal part shape tissue.At heat
Not only hardness is high for high-chromium alloy cast-iron roll after reason, and good toughness, not easy to crack, extends the service life of roll.
3rd, contain Mo, Cu element in high-chromium alloy cast-iron roll working lining provided by the invention, high-chromium alloy can be cast
Iron working lining produces post-curing during subcritical heat-treat-ment, further improve high-chromium alloy cast-iron working lining hardness and
Wearability.
4th, the present invention avoids conventional destabilized treatment and added by using subcritical heat-treat-ment to high-chromium alloy cast-iron roll
Temper technique, the cost of high-chromium alloy cast-iron roll is not only reduced, improve the condition of work of worker, while also saved
The energy, is advantageous to energy-conserving and environment-protective.
Embodiment
The technical scheme of high-chromium alloy cast-iron roll provided by the invention is further described below, makes this area
Technical staff can be better understood from the present invention and can be practiced.
Embodiment 1
Step 1, 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.
In intermediate frequency furnace according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining add the pig iron, useless roller,
Steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron smelting temperature are 1530 DEG C, and add RE and carry out essence
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, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1440
DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, produce spheroidal graphite cast-iron after adjusting component is qualified
Roller core molten iron.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.5%, and nodulizer is that yttrium base weight is dilute
Soil, the weight/mass percentage composition in spheroidal graphite cast-iron roller core are 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, casting
Temperature is 1530 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1220 DEG C, carries out first time casting, and cast temperature is 1390 DEG C, and casting quality is the gross mass of spheroidal graphite cast-iron roller core
1/3rd, when first time casting spheroidal graphite cast-iron roller core temperature be cooled to 1150 DEG C when, the ductile cast iron roller for surplus of casting
Core iron water, cast temperature are 1390 DEG C.
Casting finishes to obtain molding roller.
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated to 9 DEG C/h speed
540 DEG C, after being incubated 8h, room temperature is cooled in air, produces high-chromium alloy cast-iron roll.
Embodiment 2
Step 1, 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 Fe.
In intermediate frequency furnace according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining add the pig iron, useless roller,
Steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, smelting temperature are 1550 DEG C, and add RE and carry out essence
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, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1450
DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, produce spheroidal graphite cast-iron after adjusting component is qualified
Roller core molten iron.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.6%, and nodulizer is that yttrium base weight is dilute
Soil, the weight/mass percentage composition in spheroidal graphite cast-iron roller core are 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, casting
Temperature is 1550 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1230 DEG C, carries out first time casting, and cast temperature is 1400 DEG C, and casting quality is the gross mass of spheroidal graphite cast-iron roller core
1/3rd, when first time casting spheroidal graphite cast-iron roller core temperature be cooled to 1160 DEG C when, the ductile cast iron roller for surplus of casting
Core iron water, cast temperature are 1400 DEG C.
Casting finishes to obtain molding roller.
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated with 10 DEG C/h speed
To 550 DEG C, after being incubated 10h, room temperature is cooled in air, produces high-chromium alloy cast-iron roll.
Embodiment 3
Step 1, 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 Fe.
In intermediate frequency furnace according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining add the pig iron, useless roller,
Steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, smelting temperature are 1570 DEG C, and add RE and carry out essence
Refine quenched, high-chromium alloy cast-iron working lining molten iron is produced after adjusting component is qualified.
The melting of spheroidal graphite cast-iron roller core, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1480
DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, produce spheroidal graphite cast-iron after adjusting component is qualified
Roller core molten iron.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.7%, and nodulizer is that yttrium base weight is dilute
Soil, the weight/mass percentage composition in spheroidal graphite cast-iron roller core are 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, casting
Temperature is 1570 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1235 DEG C, carries out first time casting, and cast temperature is 1400 DEG C, and casting quality is the gross mass of spheroidal graphite cast-iron roller core
1/3rd, when first time casting spheroidal graphite cast-iron roller core temperature be cooled to 1160 DEG C when, the ductile cast iron roller for surplus of casting
Core iron water, cast temperature are 1400 DEG C.
Casting finishes to obtain molding roller.
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated with 11 DEG C/h speed
To 580 DEG C, after being incubated 12h, room temperature is cooled in air.
Embodiment 4
Step 1, 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 Fe.
In intermediate frequency furnace according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining add the pig iron, useless roller,
Steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, smelting temperature are 1580 DEG C, and add RE and carry out essence
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, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1490
DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, produce spheroidal graphite cast-iron after adjusting component is qualified
Roller core molten iron.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.8%, and nodulizer is that yttrium base weight is dilute
Soil, the weight/mass percentage composition in spheroidal graphite cast-iron roller core are 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, casting
Temperature is 1580 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1240 DEG C, carries out first time casting, and cast temperature is 1400 DEG C, and casting quality is the gross mass of spheroidal graphite cast-iron roller core
1/3rd, when first time casting spheroidal graphite cast-iron roller core temperature be cooled to 1160 DEG C when, the ductile cast iron roller for surplus of casting
Core iron water, cast temperature are 1400 DEG C.
Casting finishes to obtain molding roller；
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated with 12 DEG C/h speed
To 590 DEG C, after being incubated 13h, room temperature is cooled in air, produces high-chromium alloy cast-iron roll.
Embodiment 5
Step 1, 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.
In intermediate frequency furnace according to the element weight/mass percentage composition of high-chromium alloy cast-iron working lining add the pig iron, useless roller,
Steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, smelting temperature are 1600 DEG C, and add RE refinings and adjust
Matter, high-chromium alloy cast-iron working lining molten iron is produced after adjusting component is qualified.
The melting of spheroidal graphite cast-iron roller core, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1500
DEG C, and nodularization and inoculation are carried out to it to its addition nodulizer and inovulant, produce spheroidal graphite cast-iron after adjusting component is qualified
Roller core molten iron.Inovulant is silicon barium, and the weight/mass percentage composition in spheroidal graphite cast-iron roller core is 0.9%, and nodulizer is that yttrium base weight is dilute
Soil, the weight/mass percentage composition in spheroidal graphite cast-iron roller core are 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, high-chromium alloy cast-iron molten iron is injected in centrifugation machine casting mold, cast temperature is
1600℃；
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat the interior wall temperature of high-chromium alloy cast-iron working lining
Degree is cooled to 1250 DEG C, carries out first time casting, and cast temperature is 1410 DEG C, and casting quality is spheroidal graphite cast-iron roller core gross mass
1/3rd, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1170 DEG C, the spheroidal graphite cast-iron roller core for surplus of casting
Molten iron, cast temperature are 1410 DEG C.
Casting finishes to obtain molding roller.
Step 3：Heat treatment
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated with 13 DEG C/h speed
To 600 DEG C, after being incubated 15h, room temperature is cooled in air, produces high-chromium alloy cast-iron roll.
Table 1 is the hardness and impact flexibility test result of the high-chromium alloy cast-iron roll of embodiment 1~5.
The high-chromium alloy cast-iron roller performance of table 1
The hardness and impact flexibility test result of the high-chromium alloy cast-iron roll of embodiment 1~5 show provided by the invention
High-chromium alloy cast-iron roll not only has high hardness, and has good impact flexibility.Roll working lining is not susceptible to split
Line and cracking, extend the service life of roll.Through experiment, the service life ratio of high-chromium alloy cast-iron roll provided by the invention
The roll of prior art improves 1.4 times.
High-chromium alloy cast-iron roll provided by the invention and preparation method thereof, is not restricted to the described embodiments, every profit
With the method for the present invention, by the formed technical scheme that converts and replace, all within the scope of the present invention.
Claims (1)
1. a kind of high-chromium alloy cast-iron roll, including high-chromium alloy cast-iron working lining and spheroidal graphite cast-iron roller core, it is characterised in that：Institute
The chemical element component and its weight/mass percentage composition for stating 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 Fe, institute
It is that martensite is matrix to state high-chromium alloy cast-iron working lining, and for residual austenite content 8~15%, carbide is in daisy_petal part shape
The tissue of isolated distribution；
The preparation method of the high-chromium alloy cast-iron roll comprises the following steps：
Step 1, melting：
The melting of high-chromium alloy cast-iron working lining molten iron, according to first quality of high-chromium alloy cast-iron working lining in intermediate frequency furnace
Measure percentage composition and add the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, nickel plate, molybdenum-iron, ferro-boron, copper and vanadium iron, melting temperature
Spend for 1530~1600 DEG C, and add RE refining it is quenched, after adjusting component is qualified, produce 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 adds ball to it
Agent and inovulant carry out nodularization and inoculation to it, produce ductile cast iron roller core iron water, the inovulant is silicon barium, described
Weight/mass percentage composition of the inovulant in spheroidal graphite cast-iron roller core is 0.5~0.9%, and the nodulizer is yttrium-base heavy rare earth, described
Weight/mass percentage composition of the nodulizer 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, high-chromium alloy cast-iron working lining molten iron is injected in centrifugation machine casting mold, cast temperature
For 1530~1600 DEG C；
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, treat that the inner wall temperature of high-chromium alloy cast-iron working lining is cold
But to 1220~1250 DEG C, first time casting is carried out, cast temperature is 1390~1410 DEG C, and casting quality is spheroidal graphite cast-iron roller core
/ 3rd of gross mass, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1150~1170 DEG C, surplus of casting
Ductile cast iron roller core iron water, cast temperature be 1390~1410 DEG C；
Casting finishes to obtain molding roller；
Step 3, heat treatment：
The molding roller obtained in step 2 is stripped, room temperature is cooled in air, is then heated to 9~13 DEG C/h speed
540~600 DEG C, after being incubated 8~15h, room temperature is cooled in air, produces the high-chromium alloy cast-iron roll.
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| SU449981A1 (en) * | 1973-05-24 | 1974-11-15 | Институт черной металлургии | Cast iron |
| SU1036788A1 (en) * | 1982-05-04 | 1983-08-23 | Украинский Ордена Трудового Красного Знамени Научно-Исследовательский Институт Металлов | Cast iron |
| CN1028545C (en) * | 1991-06-28 | 1995-05-24 | 成都市新都机械轧辊厂 | Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process |
| CN1032262C (en) * | 1991-09-12 | 1996-07-10 | 川崎制铁株式会社 | Outer material of roll and composite roll of centrifugal casting |
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