CN108796350A - A kind of chemical industry high-chromium iron-cast roller and preparation method thereof - Google Patents
A kind of chemical industry high-chromium iron-cast roller and preparation method thereof Download PDFInfo
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- CN108796350A CN108796350A CN201810662919.5A CN201810662919A CN108796350A CN 108796350 A CN108796350 A CN 108796350A CN 201810662919 A CN201810662919 A CN 201810662919A CN 108796350 A CN108796350 A CN 108796350A
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- iron
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- working lining
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- 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
-
- 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
-
- 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
Abstract
The present invention provides a kind of chemical industry high-chromium iron-cast roller, including rich chromium cast iron working lining and spheroidal graphite cast-iron roller core, and the ingredient and content of working lining are C：2.1~2.9%, Si：0.5~0.48%, Mn：0.5~0.8%, Cr：15~20%, Ni：0.5~2%, Mo：0.5~2%, V：0.2~3.0%, Ti：0.1~0.4%, Cu：0.2~0.8%, RE:0.01~0.03%, P：<0.15%, S：<0.15%, surplus is iron.It is cast using composite centrifugal method when preparation, when heat treatment, molding roller is warming up to 920~960 DEG C with the speed of 9~12 DEG C/h, keeps the temperature 30~60min, and quenching is cooled to 200~250 DEG C, keeps the temperature 8~10h, obtains chemical industry rich chromium cast iron composite roll.The chemical industry high-chromium iron-cast roller of the present invention occurs during use without chip off-falling phenomenon, and has good corrosion resistance, has high hardness and wearability, extends the service life of roll.
Description
Technical field
The invention belongs to roll manufacturing technology field, more particularly to a kind of chemical industry high-chromium iron-cast roller and its preparation side
Method.
Background technology
The high-chromium iron-cast roller of centrifugal casting is widely used in chemical engineering industry, roll and core component,
Performance directly affects grinding efficiency, safeguards the replacement cycle etc..The roll of the prior art in use, is usually present below
Problem：
First, in use, there is the phenomenon of chip off-falling or cracking etc. to roll working lining in surface layer.
Second, roll is when processing chemical products, under conditions of acid and alkali corrosion, the phenomenon that easy ting produce corrosion.More than
The appearance of phenomenon can cause the wearability of roll to reduce, and influence the service life of roll, cracking and chip off-falling phenomenon.
Third, when work roll cooling, in use, it wears no resistance especially under etching condition, due to corrosive presence,
The abrasion for accelerating roll working lining greatly reduces the service life of roll.
Therefore, how to regulate and control the additive amount of Cr, C in high chromium Casting Roller, by and with other alloying elements synergistic effect, lead to
Cross rational heat treatment method, obtain rational metallographic structure, the corrosion-resistant and polishing machine to improve rich chromium cast iron need into
Row systematic research.
Invention content
The object of the present invention is to provide a kind of good corrosion resistance, when use, is not allowed to be also easy to produce corrosion and cracking chip off-falling, wear-resisting
Chemical industry high-chromium iron-cast roller and its processing method that newly can be good.
The present invention to realize the above-mentioned technical purpose, adopts the following technical scheme that.
A kind of chemical industry high-chromium iron-cast roller, including rich chromium cast iron working lining and spheroidal graphite cast-iron roller core.Rich chromium cast iron works
Layer chemical composition and its mass percent be：C：2.1~2.9%, Si：0.4~0.8%, Mn：0.5~0.8%, Cr：15~
20%, Ni：0.5~2%, Mo：0.5~2%, V：0.2~3.0%, Ti：0.1~0.4%, Cu：0.2~0.8%, RE:0.01
~0.03%, P：<0.15%, S：<0.15%, surplus is iron.
A kind of preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, ferrotianium, copper scrap is added, smelting temperature is
1530 DEG C~1600 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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 DEG C~1500 DEG C, and addition nodulizer and inovulant carry out it nodularization and inoculation thereto, adjusting component is qualified
Afterwards, ductile cast iron roller core iron water is obtained.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is
0.5~0.8%, nodulizer is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.1~1.6%.
Step 2: composite centrifugal casting and forming
Using horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed is 700~1000r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1530 DEG C~1600 DEG C.
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1220 DEG C~1250 DEG C, first time casting is carried out, cast temperature is 1390 DEG C~1410 DEG C, and casting quality is spheroidal graphite cast-iron
The one third 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.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 800~850 DEG C, after depanning,
Air-cooled to 200 DEG C~300 DEG C, 5~10h is then kept the temperature, carries out stress relief annealing process.Then, with the speed liter of 9~12 DEG C/h
Temperature keeps the temperature 30~60min to 920~960 DEG C, and quenching is warming up to 200~250 DEG C of tempering, keeps the temperature 8~10h, obtains chemical industry use
High-chromium iron-cast roller.
It is used to be suitable for chemical industry, increases the corrosion resistance of roll, avoided cracking chip off-falling, increase its wearability, this hair
It is bright using following method.
In the chemical industry high-chromium iron-cast roller of the present invention, Cu elements and a small amount of RE is added in rich chromium cast iron working lining,
On the basis of the prior art, C content is reduced.
Since the tissue of chemical industry high-chromium iron-cast roller is martensite, austenite and carbide, carbide belongs to cathode phase,
When chemical industry is in high-chromium iron-cast roller under acid ion state, matrix forms corrosion cell with carbide, causes material rotten
Erosion aggravation.The addition of Cu elements, the spalttupfel of rusty scale the defects of at be enriched with, accelerate the healing of defect, play and make rusty scale up
The effect of defect, obstruction corrosive medium are in direct contact the channel of matrix, rusty scale are made to be densified.The Local enrichment of Cu makes the object in region
Phase composition, crystal development are suppressed.That is, Cu elements can inhibit the progress of crystallization, make to be difficult to generate in rusty scale
α-Fe(OH)2For oxygen supply, the redox period is made to be not easy to carry out, on rusty scale also just be not easy generate fine crack or
Gap, therefore the reduction to lower layer is inhibited to become rusty.Fe(OH)2For oxygen supply, the redox period is set to be not easy to carry out, rich chromium cast iron work
Make layer material and just reaches corrosion resistant purpose.
Meanwhile Cu elements can be acted on the P element in rich chromium cast iron working lining, and various complex salts are formed in rusty scale,
As the core of FeOOH crystallizations, keep the crystal grain of interior rusty scale tiny, fine and close, to reduce ion channel and annode area, and
Reduce Fe3O4Generation, reduce in rusty scale electric conductivity, to reduce corrosion rate.
And the presence of Cr, the corrosivity of material can also be improved, is primarily due to Cr in rusty scale as the diffusion barrier of oxygen
The property of wall, Cr elements can make steel surface form fine and close oxidation film, improve the passivation ability of steel.
Meanwhile the presence of Cu elements, it can act synergistically with Cr elements.This is because in rich chromium cast iron working lining
In, Cr is likely to form carbide second phase, forms Cr-depleted region in the base, Anodic activity occurs so as to cause the high areas Cr, causes
The corrosion resistance of rich chromium cast iron working lining reduces, and still, the presence of Cu elements compensates for this defect, in the base due to Cu
Distribution trend with Cr on the contrary, it is higher near carbide, compensate for the reduction due to corrosive nature caused by Cr-depleted region domain.
The presence of carbide has certain effect to improving wearability in rich chromium cast iron working lining, but to the corrosion resistant of material
Corrosion tool has a certain impact, and anti-corrosion wear rate can be caused to increase rapid.Therefore, in the present invention, the content of C is reduced,
C content is controlled 2.1~2.9%.
In order to improve the wearability of chemical industry rich chromium cast iron working lining, suitable V element and Ti elements is added in the present invention,
V element is the very strong element for forming carbide, while can improve carbide morphology with refined carbides.The VC of formation is very
Stablize, and there is very high hardness, up to HV2400, the addition of V element so that the martensite content of rich chromium cast iron working lining increases
Add.It is thus possible to improve the hardness of rich chromium cast iron working lining.Meanwhile the addition of V element and Ti elements, it can further refine
The crystal grain of carbide improves the form of carbide.The presence of Ti elements can form TiC, and highly stable, heat treatment process is not
It is easy dissolving, the crystal grain of austenite can be inhibited to grow up.Therefore, the presence of V and Ti can improve the hard of rich chromium cast iron working lining
Degree and wearability.
More rational metallographic structure, the present invention also study heat treatment method and have been improved in order to obtain.
Chemical industry high-chromium iron-cast roller prepared by heat treatment method using the present invention, under as cast condition, working lining metallographic is
Austenite is matrix, and carbide separately has fine particle Dispersed precipitate around massive carbide in the distribution of blocky or chrysanthemum shape
Tissue, of length no more than 30 μm of carbide.
After heat treatment, metallographic structure M7C3Type carbide and martensite, separately the retained austenite containing proper content, residual
The content of remaining austenite is 8%~15%, and structure refinement, uniformity is good, of length no more than 50 μm of carbide.
Exist under corrosive conditions, between corrosion and abrasion and interacts, during chemical industry high-chromium iron-cast roller use,
Abrasion, which increases, to be helped to increase surface defect and accelerated corrosion；And under the action of corrosive medium, chemical industry high-chromium iron-cast roller
Surface forms the selective corrosion that tissue occurs for loose corrosion product, and the wear-resisting property of material can all be caused to reduce.Therefore, it needs
The wearability that ensure chemical industry high-chromium iron-cast roller working lining simultaneously, should ensure corrosion resistance, also focus on wearability.Group
The reasonable disposition of the composition and content knitted is also extremely important, in the present invention, while Cu be added increasing corrosion resistance, and not one
Taste increases hardness, but while increase hardness by the way that V and Ti is added, crystal grain thinning reduces hot spot, avoids stress concentration,
And retain the austenite of certain content, to stop the extension of micro-crack, to increase toughness and wearability.
The present invention uses above-mentioned technical solution, obtains following technique effect.
The chemical industry high-chromium iron-cast roller of the present invention is obtained by rational ingredient configuration and heat treatment method in working lining
The structure refinement uniformity of the chemical industry high-chromium iron-cast roller arrived, working lining is good, in use, it is possible to reduce stress collection
In, no chip off-falling phenomenon occurs, and the addition of Cu, can improve the corrosion resistance ability of tissue.Meanwhile it is resistance to Cu increases are added
It is corrosive not to increase hardness simply simultaneously, but while increase hardness by the way that V and Ti is added, crystal grain thinning is reduced rotten
Pitting, avoids stress concentration, and retains the austenite of certain content, to stop the extension of micro-crack, increase toughness and
Wearability.
Description of the drawings
Fig. 1 is the SEM figures of the as-cast structure of the chemical industry high-chromium iron-cast roller working lining of the embodiment of the present invention 1.
Fig. 2 is the front and back XRD diagram of the chemical industry high-chromium iron-cast roller working lining heat treatment of the embodiment of the present invention 1.
Fig. 3 is the SEM figures of the tissue after the chemical industry high-chromium iron-cast roller working lining heat treatment of the embodiment of the present invention 1.
Fig. 4 is the NaCl solution that the chemical industry of the embodiment of the present invention 1 is 5% in mass percent concentration with high-chromium iron-cast roller
The middle macro morphology figure for carrying out corrosion 30d.
Fig. 5 be the embodiment of the present invention 1 chemical industry high-chromium iron-cast roller working lining different parts before heat treatment after it is hard
Degree figure.
Specific implementation mode
In order to illustrate the embodiments of the present invention more clearly and/or technical solution in the prior art, attached drawing will be compareed below
Illustrate the specific implementation mode of the present invention.It should be evident that the accompanying drawings in the following description is only the embodiment of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
The present invention provides a kind of chemical industry high-chromium iron-cast roller, including rich chromium cast iron working lining and spheroidal graphite cast-iron roller core.It is high
The chemical composition and its mass percent of chrome cast iron working lining be：C：2.1~2.9%, Si：0.4~0.8%, Mn：0.5~
0.8%, Cr：15~20%, Ni：0.5~2%, Mo：0.5~2%, V：0.2~3.0%, Ti：0.1~0.4%, Cu：0.2~
0.8%, RE:0.01~0.03%, P：<0.15%, S：<0.15%, surplus is iron.
Embodiment 1
The preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
Rich chromium cast iron working lining is according to following proportion ingredient, C：2.1%, Si：0.4%, Mn：0.5%, Cr：15%, Ni：
0.5%, Mo：0.5%, Cu：0.2%, RE:0.01%, V：0.2%, Ti：0.1%, P：<0.15%, S：<0.15%, surplus is
Iron.
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, copper scrap, ferrotianium is added, smelting temperature is
1530 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain ball
Black cast iron roll core iron water.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is 0.5%, nodularization
Agent is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.1%.
Step 2: composite centrifugal casting and forming
Use horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed 700r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1530℃。
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1220 DEG C, first time casting is carried out, cast temperature is 1390 DEG C, and casting quality is three points of spheroidal graphite cast-iron roller core gross mass
One of, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1150 DEG C, the ductile cast iron roller core iron water for surplus of casting,
Cast temperature is 1390 DEG C.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 850 DEG C, it is air-cooled to arrive after depanning
300 DEG C, 5h is kept the temperature, carries out stress relief annealing process.Then, 960 DEG C are warming up to the speed of 9 DEG C/h, keep the temperature 30min, quenched,
200 DEG C of tempering are warming up to, 8h is kept the temperature, obtains chemical industry high-chromium iron-cast roller.
Embodiment 2
The preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
Rich chromium cast iron working lining is according to following proportion ingredient, C：2.3%, Si：0.6%, Mn：0.6%, Cr：16%, Ni：
0.8%, Mo：0.8%, Cu：0.4%, RE:0.02%, V：1%, Ti：0.2%, P：<0.15%, S：<0.15%, surplus is
Iron.
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, copper scrap, ferrotianium is added, smelting temperature is
1550 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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
1450 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain ball
Black cast iron roll core iron water.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is 0.6%, nodularization
Agent is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.2%.
Step 2: composite centrifugal casting and forming
Use horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed 800r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1550℃。
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1230 DEG C, first time casting is carried out, cast temperature is 1400 DEG C, and casting quality is three points of spheroidal graphite cast-iron roller core gross mass
One of, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1160 DEG C, the ductile cast iron roller core iron water for surplus of casting,
Cast temperature is 1400 DEG C.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 830 DEG C, it is air-cooled to arrive after depanning
250 DEG C, 6h is kept the temperature, carries out stress relief annealing process.Then, 950 DEG C are warming up to the speed of 10 DEG C/h, keep the temperature 50min, quenches
Fire then heats to 220 DEG C of tempering, keeps the temperature 9h, obtains chemical industry high-chromium iron-cast roller.
Embodiment 3
The preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
Rich chromium cast iron working lining is according to following proportion ingredient, C：2.4%, Si：0.6%, Mn：0.7%, Cr：17%, Ni：
1%, Mo：1%, Cu：0.5%, RE:0.03%, V：1.5%, Ti：0.3%, P：<0.15%, S：<0.15%, surplus is iron.
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, copper scrap, ferrotianium is added, smelting temperature is
1570 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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
1480 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain ball
Black cast iron roll core iron water.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is 0.7%, nodularization
Agent is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.4%.
Step 2: composite centrifugal casting and forming
Use horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed 900r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1570℃。
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1235 DEG C, first time casting is carried out, cast temperature is 1400 DEG C, and casting quality is three points of spheroidal graphite cast-iron roller core gross mass
One of, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1160 DEG C, the ductile cast iron roller core iron water for surplus of casting,
Cast temperature is 1400 DEG C.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 800 DEG C, it is air-cooled to arrive after depanning
200 DEG C, 7h is then kept the temperature, carries out stress relief annealing process.Then, 940 DEG C are warming up to the speed of 11 DEG C/h, keep the temperature 60min,
Quenching then heats to 230 DEG C of tempering, keeps the temperature 10h, obtains chemical industry high-chromium iron-cast roller.
Embodiment 4
The preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
Rich chromium cast iron working lining is according to following proportion ingredient, C：2.6%, Si：0.5%, Mn：0.8%, Cr：18%, Ni：
1.5%, Mo：1.5%, Cu：0.6%, RE:0.02%, V：2%, Ti：0.2%, P：<0.15%, S：<0.15%, surplus is
Iron.
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, copper scrap, ferrotianium is added, smelting temperature is
1580 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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
1490 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain ball
Black cast iron roll core iron water.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is 0.8%, nodularization
Agent is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.5%.
Step 2: composite centrifugal casting and forming
Use horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed 900r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1590℃。
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1240 DEG C, first time casting is carried out, cast temperature is 1400 DEG C, and casting quality is three points of spheroidal graphite cast-iron roller core gross mass
One of, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1160 DEG C, the ductile cast iron roller core iron water for surplus of casting,
Cast temperature is 1400 DEG C.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 850 DEG C, it is air-cooled to arrive after depanning
280 DEG C, 8h is then kept the temperature, carries out stress relief annealing process.Then, 930 DEG C are warming up to the speed of 12 DEG C/h, keep the temperature 40min,
Quenching then heats to 250 DEG C of tempering, keeps the temperature 8h, obtains chemical industry high-chromium iron-cast roller.
Embodiment 5
The preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting
Rich chromium cast iron working lining is according to following proportion ingredient, C：2.9%, Si：0.8%, Mn：0.6%, Cr：20%, Ni：
2%, Mo：2%, Cu：0.8%, RE:0.01%, V：3.0%, Ti：0.4%, P：<0.15%, S：<0.15%, surplus is iron.
The melting of rich chromium cast iron working lining molten iron, according to the element quality hundred of rich chromium cast iron working lining in intermediate frequency furnace
Divide content that the pig iron, useless roller, steel scrap, galvanized iron bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, copper scrap, ferrotianium is added, smelting temperature is
1600 DEG C, and be added RE refining it is quenched, after adjusting component qualification, obtain rich chromium cast iron working lining molten iron.
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
1500 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain ball
Black cast iron roll core iron water.Specifically, inovulant is silicon barium, the mass percentage in spheroidal graphite cast-iron roller core is 0.8%, nodularization
Agent is yttrium-base heavy rare earth, and the mass percentage in spheroidal graphite cast-iron roller core is 1.6%.
Step 2: composite centrifugal casting and forming
Use horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed 1000r/min.
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is
1600℃。
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cold
But to 1250 DEG C, first time casting is carried out, cast temperature is 1410 DEG C, and casting quality is three points of spheroidal graphite cast-iron roller core gross mass
One of, when the spheroidal graphite cast-iron roller core temperature of first time casting is cooled to 1170 DEG C, the ductile cast iron roller core iron water for surplus of casting,
Cast temperature is 1410 DEG C.
Molding roller is obtained after casting.
Step 3: heat treatment
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 830 DEG C, it is air-cooled to arrive after depanning
300 DEG C, 10h is then kept the temperature, carries out stress relief annealing process.Then, 920 DEG C are warming up to the speed of 9 DEG C/h, keep the temperature 60min,
Quenching then heats to 250 DEG C of tempering, keeps the temperature 10h, obtains chemical industry high-chromium iron-cast roller.
Embodiment inspection result.
The chemical industry of embodiment 1 is analyzed with the as-cast structure of high-chromium iron-cast roller working lining, progress SEM figures are shown in attached
Fig. 1.
By attached drawing 1 as it can be seen that chemical industry high-chromium iron-cast roller prepared by heat treatment method using the present invention, under as cast condition,
Working lining metallographic is that austenite is matrix, and carbide separately has fine particle Dispersed precipitate in bulk in the distribution of blocky or chrysanthemum shape
Tissue around carbide, of length no more than 30 μm of carbide.
To carrying out XRD tests, XRD test knots before and after the chemical industry heat treatment of high-chromium iron-cast roller working lining of embodiment 1
Fruit sees attached drawing 2.
By attached drawing 2 it is found that under as cast condition, rich chromium cast iron work layer tissue is mainly M7C3Type carbide (Cr, Fe)7C3With it is residual
Remaining austenite.After quenching, tissue is mainly M7C3Type carbide (Cr, Fe)7C3And martensite, residual austenite content are suitable
In.
Fabric analysis after being heat-treated with high-chromium iron-cast roller working lining to the chemical industry that embodiment 1 obtains, SEM figures are shown in attached
Fig. 3.
From the figure 3, it may be seen that after heat treatment, rich chromium cast iron working lining even tissue, carbide is tiny.Residual austenite content is
8%~15%.So that roll reduces stress concentration in use, no chip off-falling phenomenon occurs for refinement and uniform tissue.
Corrosion test is carried out with high-chromium iron-cast roller to the chemical industry of embodiment 1, by chemical industry high-chromium iron-cast roller in quality
Corroded in the NaCl solution that percent concentration is 5%, the macro morphology of observation corrosion 30d.Macro morphology result is shown in attached drawing
4。
By attached drawing 4 it is found that chemical industry high-chromium iron-cast roller corrodes 30d in NaCl solution, specimen surface only occurs on a small quantity
Rust staining, it is mainly related with local spot corrosion.And rate of corrosion test result is shown, rate of corrosion 0.038mm/year, it is corrosion-resistant
Rate is good.
Hardness test is carried out to the rich chromium cast iron working lining different location of the chemical industry high-chromium iron-cast roller of embodiment 1, it is attached
Fig. 5 is the hardness of the different location of the front and back rich chromium cast iron working lining of heat treatment.After heat treatment, the hardness of rich chromium cast iron working lining reaches
To between 55~57.
Wear weight loss test is carried out with high-chromium iron-cast roller working lining to the chemical industry of embodiment 1.It is enterprising in abrasion tester
After row abrasive wear tests 30min, weightlessness is 0.05g/g.This is because high-chromium alloy cast-iron working lining even tissue, carbide
It in bulk, is evenly distributed, and has a considerable amount of retained austenite buffering micro-cracks, while there is good hardness, have one
Fixed toughness, therefore there is good wearability.
Above-described embodiment is used for illustrating the present invention, rather than limits the invention, the present invention spirit and
In scope of the claims, any modifications and changes are made to the present invention, both fall within protection scope of the present invention.
Claims (2)
1. a kind of chemical industry high-chromium iron-cast roller, including rich chromium cast iron working lining and spheroidal graphite cast-iron roller core, it is characterised in that：Gao Ge
The chemical composition and its mass percent of cast iron working lining be：C：2.1~2.9%, Si：0.4~0.8%, Mn：0.5~
0.8%, Cr：15~20%, Ni：0.5~2%, Mo：0.5~2%, V：0.2~3.0%, Ti：0.1~0.4%, Cu：0.2~
0.8%, RE:0.01~0.03%, P：<0.15%, S：<0.15%, surplus is iron.
2. a kind of preparation method of chemical industry high-chromium iron-cast roller, includes the following steps：
Step 1: melting：
The chemical composition and its mass percent of rich chromium cast iron working lining are C：2.1~2.9%, Si：0.4~0.8%, Mn：
0.5~0.8%, Cr：15~20%, Ni：0.5~2%, Mo：0.5~2%, V：0.2~3.0%, Ti：0.1~0.4%, Cu：
0.2~0.8%, RE:0.01~0.03%, P：<0.15%, S：<0.15%, surplus is iron；
According to the chemical composition and its mass percent dispensing of rich chromium cast iron working lining, the molten of rich chromium cast iron working lining molten iron is carried out
The pig iron, useless roller, steel scrap, galvanized iron is added according to the element mass percentage of rich chromium cast iron working lining in intermediate frequency furnace in refining
Bits, ferromanganese, ferrochrome, molybdenum-iron, nickel plate, vanadium iron, ferrotianium, copper scrap, smelting temperature are 1530 DEG C~1600 DEG C, and RE refinings are added and adjust
Matter after adjusting component qualification, obtains rich chromium cast iron working lining molten iron；
The melting of ductile cast iron roller core iron water, the smelting nodular cast iron roller core molten iron in intermediate frequency furnace, smelting temperature 1440
DEG C~1500 DEG C, and nodulizer and inovulant are added thereto and carries out nodularization and inoculation to it, after adjusting component qualification, obtain
To ductile cast iron roller core iron water；
Inovulant is silicon barium, and the mass percentage in spheroidal graphite cast-iron roller core is 0.5~0.8%, and nodulizer is that yttrium base weight is dilute
Soil, the mass percentage in spheroidal graphite cast-iron roller core are 1.1~1.6%；
Step 2: composite centrifugal casting and forming：
Using horizontal centrifuge casting high-chromium iron-cast roller, horizontal centrifuge rotating speed is 700~1000r/min；
Casting rich chromium cast iron working lining injects rich chromium cast iron working lining molten iron in centrifugation machine casting mold, and cast temperature is 1530 DEG C
~1600 DEG C；
Casting spheroidal graphite cast-iron roller core, spheroidal graphite cast-iron roller core are cast at twice, wait for that the inner wall temperature of rich chromium cast iron working lining is cooled to
1220 DEG C~1250 DEG C, first time casting is carried out, cast temperature is 1390 DEG C~1410 DEG C, and casting quality is spheroidal graphite cast-iron roller core
The one third 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；
Molding roller is obtained after casting；
Step 3: heat treatment：
The molding roller obtained in step 2 is demoulded when its working lining surface temperature is 800~850 DEG C, it is air-cooled after depanning
To 200 DEG C~300 DEG C, 5~10h is then kept the temperature, carries out stress relief annealing process；Then, it is warming up to the speed of 9~12 DEG C/h
920~960 DEG C, 30~60min is kept the temperature, quenching is warming up to 200~250 DEG C of tempering, keeps the temperature 8~10h, obtains chemical industry Gao Ge
Grain roll.
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| CN111321339A (en) * | 2020-04-21 | 2020-06-23 | 衢州东方特钢有限公司 | Material distributing port casting of semi-autogenous mill and high-chromium cast iron used by casting |
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| CN112620352A (en) * | 2020-11-30 | 2021-04-09 | 湖南三泰新材料股份有限公司 | High-chromium cast iron alloy composite roller |
| CN116083785A (en) * | 2022-12-27 | 2023-05-09 | 安徽华聚新材料有限公司 | Wear-resistant high-chromium cast iron and preparation method thereof |
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| CN116083785A (en) * | 2022-12-27 | 2023-05-09 | 安徽华聚新材料有限公司 | Wear-resistant high-chromium cast iron and preparation method thereof |
| CN116871462A (en) * | 2023-09-07 | 2023-10-13 | 淄博方锥机械制造有限公司 | Preparation method of steel pipe die roller with optimized high-chromium cast iron carbide morphology |
| CN116871462B (en) * | 2023-09-07 | 2023-11-14 | 淄博方锥机械制造有限公司 | Preparation method of steel pipe die roller with optimized high-chromium cast iron carbide morphology |
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