CN111471922A - CADI roller sleeve for rolling aluminum alloy plate and preparation method thereof - Google Patents
CADI roller sleeve for rolling aluminum alloy plate and preparation method thereof Download PDFInfo
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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
- 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
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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- 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
- 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
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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Abstract
A CADI roller sleeve for rolling aluminum alloy plates and a preparation method thereof belong to the technical field of rolling. The method comprises the steps of smelting by adopting a medium-frequency induction furnace, placing electrolytic copper and pig iron accounting for 10-12% of the total mass fraction of furnace charge at the bottom of the furnace, then sequentially placing a carburant, ferrocolumbium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel, mixing, heating and melting, adding ferromanganese and ferrosilicon after the molten iron is melted down, heating the molten iron to 1503 + 1517 ℃, adding 0.10 wt.% pure aluminum for deoxidation, then carrying out spheroidization and inoculation, and finally carrying out isothermal quenching treatment to obtain the CADI roller sleeve with good obdurability and wear resistance, wherein the CADI roller sleeve is used for rolling the aluminum alloy plate, can improve the surface quality of the plate, and has good economic and social benefits when being popularized and applied.
Description
Technical Field
The invention discloses a roller sleeve for rolling an aluminum alloy plate and a preparation method thereof, in particular relates to a CADI roller sleeve for rolling an aluminum alloy plate and a preparation method thereof, and belongs to the technical field of rolling.
Background
At present, since the 90 s of the last century appeared, the roller sleeve made of the traditional material 32Cr3Mo1V has the dominant position in the aluminum alloy plate rolling industry, and the weight percentage of the chemical components of the roller sleeve made of the 32Cr3Mo1V is as follows: c: 0.27-0.37, Mn: 0.20-0.50, Si: 0.20-0.40, Cr: 2.70-3.20, Ni: less than or equal to 0.30, Mo: 0.80-1.10, V: 0.15-0.25, Cu: less than or equal to 0.25, P: less than or equal to 0.025, S: less than or equal to 0.025. However, the above-mentioned 32Cr3Mo1V roller shell has the following problems: 1) the roller shell is scrapped due to the phenomenon of sleeve explosion during the rolling of the roller shell of the aluminum alloy sheet, and the roller shell is exploded mainly because the impact property of the roller shell material is low, and the roller shell can not overcome the working stress during rolling and the superposition of the stress of the roller shell after hot rolling. 2) The roller sleeve has short time for rolling the aluminum alloy plate, and the surface of the roller sleeve is cracked, and the inner wall of the roller sleeve generates microcracks and water leakage, so that the service life is reduced. Mainly caused by serious tempering brittleness phenomenon and low high-temperature fatigue performance of the material. In order to solve the problems of the roller sleeve for rolling the aluminum alloy plate, the Chinese invention patent CN105149358A discloses a composite material roller sleeve for aluminum alloy continuous casting and rolling and a manufacturing process thereof, the composite material roller sleeve comprises a composite metal outer sleeve and a copper alloy inner sleeve, the thickness of the metal outer sleeve is 10-30mm, the thickness of the copper alloy inner sleeve is 20-40mm, and the metal outer sleeve is a steel outer sleeve or a copper alloy outer sleeve. Wherein the thermal conductivity coefficient of the copper alloy inner sleeve material is 100-420W/M.K. The composite material roller sleeve is used for aluminum alloy continuous casting and rolling, and the seamless composition of the metal outer sleeve (steel or copper alloy) and the copper alloy material inner sleeve ensures that the roller sleeve has higher hardness and strength, better high temperature resistance, thermal fatigue resistance and thermal deformation resistance and longer service life; on the other hand, the liquid aluminum alloy continuous casting and rolling device has good thermal conductivity, can quickly crystallize liquid aluminum alloy in the continuous casting and rolling process of the aluminum alloy, and improves the running speed of the roller sleeve and the production capacity of equipment. The Chinese invention patent CN110449558A also discloses a casting roll for a high-speed casting and rolling machine, which comprises a roll core, a roll sleeve sleeved outside the roll core and sealing components arranged at the two axial ends of the roll core and used for sealing the roll core and the roll sleeve; the contact surface of the roller core and the roller sleeve is tightly matched; the outer wall of the roller core is provided with a surface groove; at least two cooling water channels are arranged along the axial direction of the roller core and are respectively used for water inlet and water return; and radial through holes for communicating the cooling water channels with the surface grooves are formed along the radial direction of the roller core. After the roll cores of the casting rolls form the symmetrical roll sets which are opposite left and right in groups, the requirements of a high-speed roll type casting machine for producing the high-strength aluminum alloy thin strip can be met, the requirements of a low-medium speed thick strip roll type casting machine for producing the casting machine can be met, the requirements of a high-speed roll type casting machine for producing the high-strength alloy thin strip can be met, the control capability is excellent, and the requirements of high-speed casting production can be met. The invention also discloses a chemical component proportion and a manufacturing process of the ultra-pure 32Cr3Mo1V steel roller sleeve, and the invention greatly improves the comprehensive mechanical property of the ultra-pure 32Cr3Mo1V roller sleeve by changing the chemical components and a quenching and tempering heat treatment method, overcomes the tempering brittleness of materials, particularly greatly improves the strength and the service life of the roller sleeve against thermal fatigue cracks, has excellent comprehensive mechanical property, and unifies the strength, the hardness, the plasticity and the impact property of the roller sleeve. In industrial production, when an aluminum alloy plate is rolled by using a high-speed rolling mill, particularly when some high-strength aluminum alloy plates are rolled, the aluminum alloy materials are deformed and generate heat, the plate is poor or the lubrication is uneven, so that the aluminum alloy plate is easy to transversely move in the rolling process, and the abrasion of a roller sleeve is aggravated.
Disclosure of Invention
Aiming at the defects of poor thermal fatigue performance, low wear resistance, short service life and the like of the roller sleeve for rolling the aluminum alloy plate at present, the invention breaks through the traditional research thought on the basis of Austempered Ductile Iron (ADI), introduces strong carbide forming elements into the ADI and develops carbide-Containing Austempered Ductile Iron (CADI). The CADI not only has the characteristics of light ADI mass, good toughness and shock absorption and the like, but also has more excellent wear resistance, is used for manufacturing the roller sleeve for rolling the aluminum alloy plate, can overcome the defects of the existing roller sleeve, and prolongs the service life of the roller sleeve.
The invention discloses a preparation method of a CADI roller sleeve for rolling an aluminum alloy plate, which is characterized by comprising the following specific preparation process steps:
①, smelting by using a medium frequency induction furnace, firstly placing electrolytic copper and pig iron accounting for 10-12% of the total mass fraction of furnace charge at the bottom of the furnace, then sequentially placing carburant, ferrochromium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel, mixing, heating and melting, after the molten iron is molten down, adding ferromanganese and ferrosilicon, heating the molten iron to 1503 and 1517 ℃, adjusting the chemical composition and mass fraction of the molten iron in the furnace to 3.34-3.49% C, 1.62-1.80% Si, 3.87-4.02% Mn, 0.14-0.22% Nb, 0.21-0.32% W, 0.37-0.46% Mo, 0.82-0.96% Cu, 1.02-1.15% Cr, 0.030% S, 040% P, the balance Fe, continuously adding pure aluminum accounting for 0.10 wt% of the molten iron in the furnace for deoxidation, then transferring the molten iron into a ladle, pouring molten iron ladle, transferring the molten iron into a ladle, pouring ladle, adding molten iron with the molten iron flowing antimony in the ladle, adding molten iron, casting ladle, adding molten iron, performing a molten iron flow rate of 0.7% Mg, adding a molten iron, a molten iron flow rate, adding a molten iron flow rate, a vanadium-0.5% Si, a molten iron flow rate, adding a molten iron inoculation process, a vanadium-0.35% Si, a molten iron flow rate, adding a molten iron flow rate, a molten iron flow rate of a molten iron;
② solidifying and cooling the molten iron, opening the box, cleaning, grinding the casting, and rough machining(ii) a Heating the cast after rough machining to 890-905 ℃ along with the furnace, preserving the heat for 120-150 minutes, putting the cast into a water pool with the water temperature of 45-60 ℃, cooling for 60-90 seconds, taking out the cast, and putting the cast into a furnace with 50 wt% KNO3And 50 wt% NaNO3The temperature of the components is 280-295 ℃, the heat preservation is carried out for 3-4h, then the components are taken out and cooled to the room temperature in the air, and finally the precision machining is carried out to the specified size and precision, thus obtaining the CADI roller shell for rolling the aluminum alloy plate.
The chemical composition and the mass fraction of the vanadium-nitrogen alloy are 44.47-45.78% V, 9.63-10.50% N, < 0.50% C, < 3.0% Si, < 0.09% P, < 0.05% S, < 2.5% Al and the balance Fe.
The CADI roller sleeve for rolling the aluminum alloy plate is smelted by adopting a medium-frequency induction furnace, has high efficiency and is easy to adjust and control components. In the charging process of smelting, electrolytic copper and pig iron accounting for 10-12% of the total mass fraction of the furnace burden are firstly placed at the bottom of an electric furnace, because the electrolytic copper and the pig iron have low melting points and high melting speed, and are placed at the bottom to be melted firstly, carburant with high melting point, ferrocolumbium, ferrotungsten, ferromolybdenum and ferrochromium are soaked in the molten liquid melted firstly, so that the melting and melting of the carburant, ferrocolumbium, ferrotungsten, ferromolybdenum and ferrochromium are accelerated, the melting speed is improved, the smelting time is shortened, and the oxidation burning loss of alloy elements is reduced. After molten iron is melted down, ferromanganese and ferrosilicon are added to play a main role in pre-deoxidation and alloying. Then the molten iron is heated to 1503 ℃ and 1517 ℃, and the chemical composition and the mass fraction of the molten iron in the furnace are adjusted to 3.34 to 3.49 percent of C,1.62 to 1.80 percent of Si,3.87 to 4.02 percent of Mn,0.14 to 0.22 percent of Nb,0.21 to 0.32 percent of W,0.37 to 0.46 percent of Mo,0.82 to 0.96 percent of Cu,1.02 to 1.15 percent of Cr, <0.030 percent of S, <0.040 percent of P, and the balance of Fe. The molten iron contains 0.14-0.22% of Nb, 0.21-0.32% of W, 0.37-0.46% of Mo and 1.02-1.15% of Cr, and the elements are strong carbide forming elements, and high-melting-point and high-hardness carbides are precipitated in the solidification process and embedded in a matrix structure, so that the hardness and the wear resistance of the material are improved. The addition of Cu in 0.82-0.96% can raise the hardenability and corrosion resistance of the material. 3.87-4.02% of Mn is added, so that the hardenability of the material can be improved, and the austenitizing temperature can be reduced. And 0.10 wt.% pure aluminum is continuously added for deoxidation, so that the oxygen content in the molten iron can be reduced, and the spheroidization of the molten iron is promoted to obtain the spherical graphite.
Then transferring the molten iron into a ladle, and adding vanadium-nitrogen alloy and metal antimony along with the molten iron flow in the process of transferring the molten iron into the ladle, wherein the chemical composition and the mass fraction of the vanadium-nitrogen alloy are 44.47-45.78% V, 9.63-10.50% N, < 0.50% C, < 3.0% Si, < 0.09% P, < 0.05% S, < 2.5% Al and the balance Fe. The vanadium-nitrogen alloy is added into molten iron, fine VN particles are generated, solidification structure refinement is promoted, and partial vanadium enters a matrix, so that the matrix strength is improved. The addition amounts of the vanadium-nitrogen alloy and the metal antimony respectively account for 0.25 percent and 0.12 percent of the mass fraction of the molten iron entering the casting ladle, and the particle sizes of the vanadium-nitrogen alloy and the metal antimony are 1.5-3.5 mm. 0.12 percent of antimony is added into molten iron, so that the roundness of graphite nodules can be improved, the sphere diameter is reduced, and the toughness of CADI is improved. The inoculant and the nodulizer are placed at the bottom of the ladle in advance, and are subjected to nodulizing treatment and inoculation by adopting a flushing method, so that the operation is simple and convenient, and the nodulizing effect is good. The inoculant used was FeSi75, added at 1.2 wt.%; FeSiMg6Re2 is used as a nodulizer, the adding amount is 1.5 wt.%, the molten metal in the ladle is stirred to ensure complete reaction, and slag in the ladle is removed; when the temperature is reduced to 1362-1377 ℃, the molten iron is poured into the casting mold which rotates on the horizontal centrifugal at a high speed, and the rotation speed of the casting mold is 650-750 rpm. The CADI roller sleeve is produced by adopting a centrifugal casting method, the efficiency is high, and the structure of the roller sleeve is compact.
And after the molten iron is solidified and cooled, opening the box, cleaning, polishing the casting, and then performing rough machining. And heating the cast after rough machining to 890-905 ℃ along with the furnace, and preserving the heat for 120-150 minutes to realize austenitizing. Then the mixture is put into a water tank with the water temperature of 45-60 ℃ and cooled for 60-90 seconds. The water temperature of 45-60 ℃ is selected because the CADI roller sleeve is cooled too fast and is prone to cracking due to too low water temperature. When the water temperature is too high, the CADI roller sleeve is cooled too slowly, and pearlite with low hardness appears in the core. The cooling time is controlled within 60-90 seconds, which is beneficial to obtaining a bainite and carbon-rich austenite structure with excellent performance by the subsequent isothermal quenching. Cooling in water for 60-90 s, taking out the casting, and adding 50 wt% KNO3And 50 wt% NaNO3The temperature of the components is 280-295 ℃, and the heat is preserved for 3-4h to finish isothermal quenching, so that a bainite and carbon-rich austenite structure is obtained, and the bainite and carbon-rich austenite structure has excellent wear resistance and good toughnessAnd (4) sex. And finally, performing finish machining to specified size and precision to obtain the CADI roller sleeve for rolling the aluminum alloy plate.
Compared with the prior art, the invention has the following characteristics:
1) the roller sleeve is smelted by adopting a medium-frequency induction furnace, the process is simple and convenient, the stability is good, and the obtained roller sleeve is uniform in components and performance;
2) the roller sleeve does not contain expensive cobalt and nickel elements, has low cost and is easy to popularize and apply;
3) the hardness of the roll sleeve is more than 80HSD, and the impact toughness is more than 18J/cm2The tensile strength is more than 550MPa, the rolling mill is used for rolling the aluminum alloy plate, has the characteristics of safe use, stable process, good plate appearance quality, high production efficiency and the like, and has good economic and social benefits when being popularized and applied.
Drawings
FIG. 1CADI roller shell microstructure.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1:
a CADI roller sleeve for rolling aluminum alloy plates is smelted by adopting a 3000 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
① smelting in medium frequency induction furnace, adding electrolytic copper and 10 wt% of pig iron to the bottom of the furnace, adding carburant, ferroniobium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel, mixing and heating to melt, adding ferromanganese and ferrosilicon, heating to 1503 deg.c, regulating the chemical composition and weight fraction of the molten iron to 3.34% of C, 1.80% of Si, 3.87% of Mn, 0.22% of Nb, 0.21% of W, 0.46% of Mo, 0.82% of Cu, 1.15% of Cr, 0.021% of S, 0.033% of P and the balance Fe, adding 0.10 wt% of pure aluminum to deoxidize, transferring the molten iron into ladle, adding vanadium-nitrogen alloy (the chemical composition and weight fraction of the vanadium-nitrogen alloy being 44.47% of V, 9.63% of N, 0.16% of C, 1.24% of Si, 0.03% of Si, 0.08% of Si, 2.08% of Si, 2.2% of Mg, 1.7% of Mg, 2.3.3% of Si, 2% of Mg, 2.3.3.3% of Mg, 5.3.3.3-2% of Si, 2% of Mg, 5% of Mg, 2% of Mg, 2.3.3.3.3.3.3.3.3.3.3.3% of Si, 2% of Mg, 2.3.3.3.3.3.3.3.3% of Mg, 2.3% of Mg, 2% of Si, 2.3.3.3.3.3% of Mg, 2% of Fe, 2% of Si, 2.3.3.3.;
② solidifying and cooling the molten iron, opening the box, cleaning, polishing the casting, rough machining, heating the rough machined casting to 890 ℃ along with the furnace, keeping the temperature for 150 minutes, cooling in a water pool with the water temperature of 45 ℃ for 60 seconds, taking out the casting, and putting the casting into a 50 wt% KNO3And 50 wt% NaNO3The components are dissolved in a nitrate solution with the temperature of 280 ℃, the temperature is kept for 3h, then the nitrate solution is taken out and cooled to the room temperature in the air, and finally the CADI roller sleeve for rolling the aluminum alloy plate can be obtained after the precision and the dimension are finished. The mechanical properties of the roll shell are shown in Table 1.
Example 2:
a CADI roller sleeve for rolling aluminum alloy plates is smelted by adopting a 5000 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
①, smelting by using a medium frequency induction furnace, firstly placing electrolytic copper and pig iron accounting for 12% of the total mass fraction of furnace charge at the bottom of the furnace, then sequentially adding carburant, ferroniobium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel, mixing and heating for melting, adding ferromanganese and ferrosilicon after molten iron is melted down, heating the molten iron to 1517 ℃, adjusting the chemical composition and mass fraction of the molten iron in the furnace to 3.49% of C, 1.62% of Si, 4.02% of Mn, 0.14% of Nb, 0.32% of W, 0.37% of Mo, 0.96% of Cu, 1.02% of Cr, 0.027% of S, 0.035% of P and the balance Fe, continuously adding 0.10 wt% of pure aluminum for deoxidation, then transferring the molten iron into a ladle, and transferring into the ladle during ladle pouring, adding vanadium-nitrogen alloy (the chemical composition and mass fraction of the balance of the alloy are 45.78% of V, 10.50% of N, 0.29% of C, 2.13% of Si, 0.08% of Si, 0.7% of Mg, 0.7% of molten iron is added into a ladle, molten iron is added into a molten iron, molten iron is subjected to be treated by mass fraction, molten iron is added with a molten iron is added, molten iron is added into a molten iron, molten iron is added with a molten iron, molten iron is treated by a molten iron is added, molten iron is treated by a molten iron is added with a molten iron, molten iron is added with a molten iron is treated by a molten iron is added with a molten iron, molten iron is added with a molten iron is added;
② solidifying and cooling the molten iron, opening the box, cleaning, polishing the casting, rough machining, heating the rough machined casting to 905 deg.C, holding the temperature for 120 min, cooling in a water pool with water temperature of 60 deg.C for 90 s, taking out the casting, and putting in a 50 wt% KNO3And 50 wt% NaNO3The temperature of the components is 295 ℃, the components are kept for 4 hours in nitrate solution, then the nitrate solution is taken out and cooled to room temperature in the air, and finally the CADI roller sleeve for rolling the aluminum alloy plate can be obtained after the precision and the precision of the CADI roller sleeve are finished. The mechanical properties of the roll shell are shown in Table 1.
Example 3:
a CADI roller sleeve for rolling aluminum alloy plates is smelted by adopting a 3000 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
① adopts a medium frequency induction electric furnace for smelting, electrolytic copper and pig iron which accounts for 11 percent of the total mass fraction of furnace materials are placed at the bottom of the electric furnace, then carburant, ferroniobium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel are sequentially added, mixed and heated to be molten, ferromanganese and ferrosilicon are added after molten iron is melted down, the molten iron is heated to 1511 ℃, the chemical composition and the mass fraction of the molten iron in the furnace are adjusted to 3.38 percent of C,1.69 percent of Si,3.95 percent of Mn,0.17 percent of Nb,0.26 percent of W,0.40 percent of Mo,0.89 percent of Cu,1.04 percent of Cr,0.026 percent of S,0.029 percent of P and the balance of Fe, 0.10 percent of pure aluminum is continuously added for deoxidation, then the molten iron is transferred into a ladle, the molten iron is transferred into the ladle, vanadium-nitrogen alloy is added along with the molten iron flow in the process of molten iron (the chemical composition and the mass fraction of the vanadium-nitrogen alloy is 45.06 percent of V,9.91 percent of N,0.34 percent of C,1.66 percent of Si,0.04 percent of Si,0.08 percent of Mg, the molten iron is added into a ladle, molten iron is added into a molten iron, molten iron is added with a molten iron, molten iron is completely stirred, molten iron is added with a molten iron, molten iron;
② solidifying and cooling the molten iron, opening the box, cleaning, polishing the casting, rough machining, heating the rough machined casting to 900 deg.C, holding the temperature for 130 min, cooling in a water pool with water temperature of 53 deg.C for 80 s, taking out the casting, and putting in a 50 wt% KNO3And 50 wt% NaNO3The temperature of the components is 290 ℃, the components are kept for 3.5 hours, then the components are taken out and cooled to room temperature in the air, and finally the components are finished to the specified size and precision, so that the CADI roller shell for rolling the aluminum alloy plate can be obtained. The mechanical properties of the roll shell are shown in Table 1.
TABLE 1 mechanical Properties of CADI roller covers for rolling aluminum alloy sheets
| Mechanical properties | hardness/HSD | Impact toughness (J/cm)2) | Tensile strength/MPa |
| Example 1 | 80.5 | 18.8 | 590 |
| Example 2 | 81.6 | 19.2 | 575 |
| Example 3 | 81.3 | 18.4 | 580 |
The CADI roller shell is smelted by adopting a medium-frequency induction furnace, the process is simple and convenient, the stability is good, and the obtained roller shell is uniform in component and performance; the CADI roller sleeve does not contain expensive cobalt and nickel elements, has low cost and is easy to popularize and apply; the hardness of the CADI roller shell surface is more than 80HSD, the wear resistance is excellent, the graphite is separated out, the adhesion between an aluminum plate and the roller shell is prevented, and the surface quality of the plate is improved. High impact toughness greater than 18J/cm2The roller sleeve is prevented from generating fatigue cracks in use and inducing spalling. The CADI roller sleeve is used for rolling the aluminum alloy plate, has the characteristics of safe use, stable process, good plate appearance quality, high production efficiency and the like, and has good economic and social benefits when being popularized and applied.
Claims (3)
1. A preparation method of a CADI roller sleeve for rolling an aluminum alloy plate is characterized by comprising the following specific preparation process steps:
①, smelting by using a medium frequency induction furnace, firstly placing electrolytic copper and pig iron accounting for 10-12% of the total mass fraction of furnace charge at the bottom of the furnace, then sequentially placing carburant, ferrochromium, ferrotungsten, ferromolybdenum, ferrochromium and scrap steel, mixing, heating and melting, after the molten iron is molten down, adding ferromanganese and ferrosilicon, heating the molten iron to 1503 and 1517 ℃, adjusting the chemical composition and mass fraction of the molten iron in the furnace to 3.34-3.49% C, 1.62-1.80% Si, 3.87-4.02% Mn, 0.14-0.22% Nb, 0.21-0.32% W, 0.37-0.46% Mo, 0.82-0.96% Cu, 1.02-1.15% Cr, 0.030% S, 040% P, the balance Fe, continuously adding pure aluminum accounting for 0.10 wt% of the molten iron in the furnace for deoxidation, then transferring the molten iron into a ladle, pouring molten iron ladle, transferring the molten iron into a ladle, pouring ladle, adding molten iron with the molten iron flowing antimony in the ladle, adding molten iron, casting ladle, adding molten iron, performing a molten iron flow rate of 0.7% Mg, adding a molten iron, a molten iron flow rate, adding a molten iron flow rate, a vanadium-0.5% Si, a molten iron flow rate, adding a molten iron inoculation process, a vanadium-0.35% Si, a molten iron flow rate, adding a molten iron flow rate, a molten iron flow rate of a molten iron;
② molten iron is solidified and cooled, then the casting is opened, cleaned and polished, then rough machining is carried out, the rough machined casting is heated to 890-905 ℃ along with the furnace, the temperature is kept for 150 minutes, the casting enters a water pool with the water temperature of 45-60 ℃, is cooled for 60-90 seconds, then the casting is taken out and put into a furnace with 50 wt% KNO3And 50 wt% NaNO3The temperature of the components is 280-295 ℃, the heat preservation is carried out for 3-4h, then the components are taken out and cooled to the room temperature in the air, and finally the precision machining is carried out to the specified size and precision, thus obtaining the CADI roller shell for rolling the aluminum alloy plate.
2. The method of claim 1, wherein the chemical composition and mass fraction of the vanadium-nitrogen alloy is 44.47-45.78% V, 9.63-10.50% N, < 0.50% C, < 3.0% Si, < 0.09% P, < 0.05% S, < 2.5% Al, and the balance Fe.
3. A CADI sleeve prepared according to the process of claim 1 or 2.
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