CN111996439A - Large-scale high-chromium iron roll collar and preparation method of assembly type roll thereof - Google Patents
Large-scale high-chromium iron roll collar and preparation method of assembly type roll thereof Download PDFInfo
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- CN111996439A CN111996439A CN202011185193.4A CN202011185193A CN111996439A CN 111996439 A CN111996439 A CN 111996439A CN 202011185193 A CN202011185193 A CN 202011185193A CN 111996439 A CN111996439 A CN 111996439A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
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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
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
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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
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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
- C21D1/26—Methods of annealing
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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
- 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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- 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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Abstract
The invention discloses a large-scale high-chromium iron roll collar and a preparation method of an assembled roll thereof, wherein the large-scale high-chromium iron roll collar comprises the following alloy elements in percentage by weight: 2.30-2.80% of C, 0.30-1.00% of Si, 0.50-1.20% of Mn, less than or equal to 0.10% of P, less than or equal to 0.05% of S, 12.0-22.0% of Cr, 0.70-1.70% of Ni, 0.60-1.50% of Mo, 0.10-0.80% of V, 0.70-1.70% of Cu, and the balance of Fe and inevitable impurities. According to the invention, through setting reasonable alloy elements and proportion and setting high-content Cr, the wear resistance of the roll collar is improved, the micro V can refine structure grains, the strength and toughness are improved, and the reasonable proportion of each element improves the comprehensive use performance of the roll.
Description
Technical Field
The invention belongs to the technical field of rollers, and particularly relates to a large-scale high-chromium iron roller ring and a preparation method of an assembled roller thereof.
Background
The H-shaped steel is widely applied to large bridges, high-rise buildings, heavy equipment, expressways and the like which require large bearing capacity and good section stability, and plays an important role in national economic construction. The H-shaped steel rolling method is different from other hot-rolled section steels, a universal method is adopted for rolling, a horizontal roller is assembled by adopting a roller ring and a mandrel, the roller ring is usually made of a centrifugal composite material, the outer layer is made of high-carbon semi-steel or high-carbon graphite steel, and the core part is made of graphite steel or nodular cast iron with good obdurability. The horizontal roll collar is mainly used for rolling the inner sides of a web plate and a flange of the H-shaped steel, and the flange of the H-shaped steel is large in size, so that the outer circular surface and the end surfaces on two sides of the horizontal roll collar are working surfaces for rolling. The linear velocity difference of different positions of the end surface of the roll collar in the rolling process is large, so that the abrasion is serious, the quality of H-shaped steel is required to be gradually improved along with the continuous increase of the size specification of H-shaped steel rolled by a user, and the problems of poor abrasion resistance, poor hardness and poor impact toughness of high-carbon semisteel or graphite steel are more and more prominent.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides a large-scale high-chromium iron roll collar and a preparation method of an assembled roll thereof.
According to the embodiment of the invention, the large-scale high-chromium iron roll collar comprises the following alloy elements in percentage by weight: 2.30-2.80% of C, 0.30-1.00% of Si, 0.50-1.20% of Mn, less than or equal to 0.10% of P, less than or equal to 0.05% of S, 12.0-22.0% of Cr, 0.70-1.70% of Ni, 0.60-1.50% of Mo, 0.10-0.80% of V, 0.70-1.70% of Cu, and the balance of Fe and inevitable impurities.
According to the large-scale high-chromium iron roll collar disclosed by the embodiment of the invention, through setting reasonable alloy elements and proportion and setting high-content Cr, the wear resistance of the roll collar is improved, a small amount of V can refine structure grains, the strength and the toughness are improved, and the reasonable proportion of each element improves the comprehensive use performance of the roll.
According to one embodiment of the invention, the alloy elements and the weight percentage content are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn, less than or equal to 0.08% of P, less than or equal to 0.05% of S, 14-18% of Cr, 0.80-1.20% of Ni, 0.80-1.00% of Mo, 0.20-0.50% of V, 0.80-1.20% of Cu, and the balance of Fe and inevitable impurities.
According to one embodiment of the invention, the preparation method of the large-scale high-chromium iron roll collar comprises the following steps: s1, modeling: molding an outer ring and a core by using molding sand; s2, smelting: smelting molten iron in an intermediate frequency furnace at 1450-1550 ℃; s3, pouring: pouring the smelted molten iron into a cavity between the outer ring and the core by adopting a bottom pouring type static pouring method; s4, unpacking: opening the box by heating after the pouring is finished; s5, heat treatment and machining: and sequentially carrying out annealing treatment, machining and tempering treatment on the roll collar.
According to an embodiment of the present invention, the S1 specifically is: molding an outer ring and a core by using molding sand; the method specifically comprises the following steps: carrying out outer ring modeling on the inner surface of a cold mold with proper inner diameter, wherein the thickness of the hanging sand is 15mm, and uniformly coating high-temperature-resistant paint on the inner surface of the outer ring after compacting molding sand; core modeling is carried out on the outer surface of the steel pipe with proper outer diameter, high-temperature-resistant coating is uniformly coated on the outer surface of the core, and the surface of the steel pipe is provided with air holes which are uniformly distributed.
In S1, the molding sand used for the outer ring molding is chromite, the molding sand used for the core molding is resin sand, and the refractory coating is an alcohol-based zircon powder coating according to an embodiment of the present invention.
According to an embodiment of the present invention, in the S4, the temperature of the hot-opening box is 500 ℃.
According to an embodiment of the present invention, in S5, the annealing process specifically includes: and (3) putting the roll collar in the S4 into a high-temperature resistance furnace preheated to 500 ℃, preserving heat at 500 ℃, heating the roll collar to 850-1000 ℃ when the temperature is not changed, preserving heat for 15-20 h, cooling the furnace to below 100 ℃, taking out the roll collar, and air-cooling to normal temperature.
According to an embodiment of the present invention, in S5, the tempering treatment is specifically: heating the roll collar to 400-460 ℃ and preserving heat for 15-25h, and then cooling to normal temperature in air.
According to one embodiment of the invention, the method for preparing the assembly type roller, the roller ring is prepared by adopting the method for preparing the large-scale high-chromium iron roller ring, and comprises the following steps: s10, matching processing: respectively carrying out rough machining on the outer surfaces of the roll collar and the mandrel, and then respectively carrying out finish machining on the assembly surfaces of the roll collar and the mandrel; s20, assembling: carrying out base hole interference hot assembly on the roll collar and the mandrel to form an assembled roll; s30, integral processing: and finishing the outer surface of the whole assembly type roller.
In S20, the process of hot-assembling is: and (3) putting the roll collar into a resistance furnace, heating to 300 ℃ at the speed of 10 ℃/h, preserving heat for 8h, assembling the roll collar outside the mandrel, and finally cooling to room temperature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic front view of a large high chromium iron roll collar after forming in accordance with an embodiment of the present invention;
reference numerals:
a steel pipe 1;
a cold mold 3;
a seat bag 5;
a sprue 6;
a cross gate 7;
and a casting mould riser 8.
Detailed Description
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes in detail the manufacture of a large high chromium iron roll collar and its fabricated rolls according to embodiments of the present invention.
According to the embodiment of the invention, the large-scale high-chromium iron roll collar comprises the following alloy elements in percentage by weight: 2.30-2.80% of C, 0.30-1.00% of Si, 0.50-1.20% of Mn, less than or equal to 0.10% of P, less than or equal to 0.05% of S, 12.0-22.0% of Cr, 0.70-1.70% of Ni, 0.60-1.50% of Mo, 0.10-0.80% of V, 0.70-1.70% of Cu, and the balance of Fe and inevitable impurities.
According to the invention, through setting reasonable alloy elements and proportion, and setting 12.0-22.0% of Cr, the wear resistance of the roll collar is further improved, 0.10-0.80% of V can refine structure crystal grains, the strength and toughness are improved, the hydrogen corrosion resistance can be improved under high temperature and high pressure by carbide formed by V and C, the reasonable proportion of Mo, Ni, Cu and other elements can assist the Cr element to further improve the comprehensive use performance of the roll, the Cu element is softer, and the Cr element is uniformly dispersed in the structure, so that the wear resistance of the surface and the side surface of the roll collar is consistent.
Further, the alloy elements and the weight percentage content are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn, less than or equal to 0.08% of P, less than or equal to 0.05% of S, 14-18% of Cr, 0.80-1.20% of Ni, 0.80-1.00% of Mo, 0.20-0.50% of V, 0.80-1.20% of Cu, and the balance of Fe and inevitable impurities. When the Cr content exceeds 15%, the strength and the hardness begin to be reduced, the elongation and the reduction of area are correspondingly improved, and when the Cr content is 14-18%, the roll collar has certain strength and hardness and certain toughness.
The preparation method of the large-scale high-chromium iron roll collar comprises the following steps:
s1, modeling: as shown in fig. 1, the outer ring and the core are molded using molding sand; the method specifically comprises the following steps: carrying out outer ring modeling on the inner surface of the cold mold 3 with proper inner diameter, wherein the thickness of the hanging sand is 15mm, and after the molding sand is tamped, uniformly coating high-temperature-resistant paint on the inner surface of the outer ring; core modeling is carried out on the outer surface of the steel pipe 1 with proper outer diameter, high-temperature-resistant paint is uniformly coated on the outer surface of the core, and air holes are uniformly distributed on the surface of the steel pipe. Wherein, the molding sand used for outer ring molding is chromite 4, the molding sand used for core molding is resin sand 2, and the high-temperature resistant coating is alcohol-based zircon powder coating.
S2, smelting: smelting molten iron in an intermediate frequency furnace at 1450-1550 ℃;
s3, pouring: pouring the smelted molten iron into a cavity between the outer ring and the core by adopting a bottom pouring type static pouring method;
s4, unpacking: after the pouring is finished, opening the box in a hot state, wherein the temperature of opening the box in the hot state is 500 ℃;
s5, heat treatment and machining: sequentially carrying out annealing treatment, machining and tempering treatment on the roll collar; the annealing treatment specifically comprises the following steps: the roll collar in the S4 is placed into a high-temperature resistance furnace preheated to 500 ℃, heat preservation is carried out at 500 ℃, when the temperature is not changed, the roll collar is heated to 850-1000 ℃, the furnace is cooled to below 100 ℃ after the heat preservation is carried out for 15-20 hours, and then the roll collar is taken out to be air-cooled to the normal temperature; the tempering treatment specifically comprises the following steps: heating the roll collar to 400-460 ℃ and preserving heat for 15-25h, and then cooling to normal temperature in air.
According to the preparation method of the large-scale high-chromium iron roll collar, the vent holes are formed in the molding sand, so that hot air can be conveniently exhausted, the defect that air enters molten iron to cause pores is avoided, the roll is subjected to hot unpacking at 500 ℃, then heat preservation is carried out in the high-temperature resistance furnace at 500 ℃, the process of cooling to normal temperature and reheating is omitted, the processing efficiency is improved, the method is more energy-saving and environment-friendly, the internal stress is further eliminated by setting reasonable annealing and tempering heat treatment process parameters, and the uniform hardness of the end face of the roll collar is ensured.
According to the preparation method of the assembly type roller, the roller ring is prepared by adopting the preparation method of the large-scale high-chromium iron roller ring, and the preparation method comprises the following steps:
s10, matching processing: respectively carrying out rough machining on the outer surfaces of the roll collar and the mandrel, and then respectively carrying out finish machining on the assembly surfaces of the roll collar and the mandrel;
s20, assembling: carrying out base hole interference hot assembly on the roll collar and the mandrel to form an assembled roll, wherein the hot assembly process comprises the following steps: putting the roll collar into a resistance furnace, heating to 300 ℃ at the speed of 10 ℃/h, then preserving heat for 8h, assembling the roll collar outside a mandrel, and finally cooling to room temperature;
s30, integral processing: and finishing the outer surface of the whole assembly type roller.
According to the preparation method of the assembly type roller, the assembly surface is subjected to finish machining, meanwhile, interference heat assembly is conducted through the base hole, the assembly precision is improved, during heat assembly, the temperature is increased to 300 ℃ at the speed of 10 ℃/h, then heat preservation is conducted for 8h, the temperature is slowly increased, meanwhile, heat preservation is conducted for a certain time before assembly, a good assembly state is kept, the roller ring is prevented from generating internal stress, finally, finish machining is conducted on the outer surface of the whole assembly type roller, and the fact that the external dimensional precision of the whole roller is kept consistent is guaranteed.
Example one
Preparing a finish rolling horizontal roll collar of an H-shaped steel universal mill with the diameter of 1600 х 1300mm, wherein the requirements of chemical components and weight percentage are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn and less than or equal to 0.08% of P; less than or equal to 0.05 percent of S, 14-18 percent of Cr, 0.80-1.20 percent of Ni0.80-1.00 percent of Mo0.80-1.00 percent of V, 0.20-0.50 percent of Cu0.80-1.20 percent of Cu, and the balance of Fe and inevitable impurities, and the method comprises the following specific steps:
1) smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a 20-ton intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting chemical components in the furnace according to sample components in front of the furnace, adding ferrovanadium within 3 minutes before tapping, wherein the chemical components and weight percentage content of the final tapping sample are as follows: 2.51% of C, 0.57% of Si, 0.81% of Mn, 0.017% of P, 0.011% of S, 0.88% of Ni, 0.8% of Mo, 0.25% of V, 14% of Cr, 0.86% of Cu, and the balance of Fe and unavoidable impurities, and tapping when the temperature is raised to 1550 ℃.
2) Treatment outside the furnace: adding a modificator of 2 kg/ton of molten iron along with the flow in the tapping process for modification treatment.
3) Bottom pouring type static casting: when the temperature of molten iron in the ladle is reduced to 1360 ℃, the molten iron is quickly poured into the ladle 5, the molten iron is quickly filled into the cavity through the sprue 6 and the cross runner 7 after the plug ball is pried, and a heat insulating agent is added into the casting head 8 of the casting mold after pouring.
4) And (3) heat treatment: the static bottom casting as-cast roll collar is heated to 900 ℃ by adopting a hot box at 500 ℃ and enters a resistance furnace to be heated and preserved for 15h, then the furnace is cooled to below 100 ℃ and taken out of the furnace for cutting, the roll collar is fed into the resistance furnace again to be tempered at 410 ℃ after rough machining, the furnace is cooled to below 100 ℃ after 15h of heat preservation and taken out of the furnace for detection,
5) finish machining: and (4) the roll collar after the detection is qualified enters a finish machining program, and the forged steel mandrel simultaneously enters the finish machining program.
6) And (3) hot assembly: and (3) heating the roll collar subjected to finish machining in a resistance furnace to 300 ℃, preserving heat for 8h, discharging, performing thermal assembly on the roll collar and a mandrel subjected to finish machining by adopting a base hole system interference fit, and performing hole type machining again after slowly cooling to room temperature.
Example two
Preparing a finish rolling horizontal roll collar of an H-shaped steel universal mill with the diameter of 1600 х 1060mm, wherein the requirements of chemical components and weight percentage are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn and less than or equal to 0.08% of P; less than or equal to 0.05 percent of S, 14-18 percent of Cr, 0.80-1.20 percent of Ni0.80-1.00 percent of Mo0.80-1.00 percent of V, 0.20-0.50 percent of Cu0.80-1.20 percent of Cu, and the balance of Fe and inevitable impurities, and the method comprises the following specific steps:
1) smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a 20-ton intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting chemical components in the furnace according to sample components in front of the furnace, adding ferrovanadium within 3 minutes before tapping, wherein the chemical components and weight percentage content of the final tapping sample are as follows: 2.58% of C, 0.61% of Si, 0.88% of Mn, 0.022% of P, 0.019% of S, 0.95% of Ni, 0.85% of Mo, 0.34% of V, 15% of Cr, 0.96% of Cu and the balance of Fe and inevitable impurities, and tapping when the temperature is raised to 1550 ℃.
2) Treatment outside the furnace: adding a modificator of 2 kg/ton of molten iron along with the flow in the tapping process for modification treatment.
3) Bottom pouring type static casting: when the temperature of molten iron in the ladle is reduced to 1365 ℃, the molten iron is quickly poured into the ladle 5, the molten iron is quickly filled into the cavity through the sprue 6 and the cross runner 7 after the plug ball is pried, and a heat insulating agent is added into the casting head 8 of the casting mold after pouring.
4) And (3) heat treatment: the static bottom casting as-cast roll collar is heated to 920 ℃ by adopting a hot box at 500 ℃ and enters a resistance furnace to be heated and preserved for 15h, then the furnace is cooled to below 100 ℃ and taken out of the furnace for cutting, the roll collar is fed into the resistance furnace again to be tempered at 400 ℃ after rough machining, the furnace is cooled to below 100 ℃ after 15h of heat preservation and taken out of the furnace for detection,
5) finish machining: and (4) the roll collar after the detection is qualified enters a finish machining program, and the forged steel mandrel simultaneously enters the finish machining program.
6) And (3) hot assembly: and (3) heating the roll collar subjected to finish machining in a resistance furnace to 300 ℃, preserving heat for 8h, discharging, performing thermal assembly on the roll collar and a mandrel subjected to finish machining by adopting a base hole system interference fit, and performing hole type machining again after slowly cooling to room temperature.
EXAMPLE III
Preparing a finish rolling horizontal roll collar of an H-shaped steel universal mill with the diameter of 1600 mm 1600 х 960mm, wherein the requirements of chemical components and weight percentage are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn and less than or equal to 0.08% of P; less than or equal to 0.05 percent of S, 14-18 percent of Cr, 0.80-1.20 percent of Ni0.80-1.00 percent of Mo0.80-1.00 percent of V, 0.20-0.50 percent of Cu0.80-1.20 percent of Cu, and the balance of Fe and inevitable impurities, and the method comprises the following specific steps:
1) smelting: adding scrap steel, ferromolybdenum, ferrochromium, pure copper and pure nickel into a 20-ton intermediate frequency furnace for smelting, sampling and analyzing after melting down, adjusting chemical components in the furnace according to sample components in front of the furnace, adding ferrovanadium within 3 minutes before tapping, wherein the chemical components and weight percentage content of the final tapping sample are as follows: 2.64% of C, 0.68% of Si, 0.93% of Mn, 0.015% of P, 0.013% of S, 1.05% of Ni, 0.93% of Mo, 0.42% of V, 16% of Cr, 1.12% of Cu and the balance of Fe and unavoidable impurities, and tapping when the temperature is raised to 1550 ℃.
2) Treatment outside the furnace: adding a modificator of 2 kg/ton of molten iron along with the flow in the tapping process for modification treatment.
3) Static bottom pouring casting: when the temperature of molten iron in the ladle is reduced to 1370 ℃, the molten iron is quickly poured into the ladle 5, the molten iron is quickly filled into the cavity through the sprue 6 and the cross runner 7 after the plug ball is pried open, and a heat insulating agent is added into the casting head 8 of the casting mold after pouring.
4) And (3) heat treatment: the static bottom-pouring cast-state roll collar is heated to 950 ℃ by adopting a hot box at 500 ℃ and enters a resistance furnace, the temperature is preserved for 15h, the roll collar is cooled to below 100 ℃ and is discharged from the furnace for cutting, the roll collar is fed into the resistance furnace again for tempering at 400 ℃ after rough machining, the roll collar is cooled to below 100 ℃ after heat preservation for 15h and is discharged from the furnace for detection,
5) finish machining: and (4) the roll collar after the detection is qualified enters a finish machining program, and the forged steel mandrel simultaneously enters the finish machining program.
6) And (3) hot assembly: and (3) heating the roll collar subjected to finish machining in a resistance furnace to 300 ℃, preserving heat for 8h, discharging, performing thermal assembly on the roll collar and a mandrel subjected to finish machining by adopting a base hole system interference fit, and performing hole type machining again after slowly cooling to room temperature.
The rolls prepared in example one, example two and example three were tested separately and the results were as follows:
meter I, roll collar end face testing
| Case(s) | Tensile strength (MPa) | Hardness (HSC) | Impact toughness (j) |
| Example one | 620 | 66 | 6.3 |
| Example two | 650 | 72 | 6.0 |
| EXAMPLE III | 600 | 68 | 6.9 |
The tensile strength of a roller of common high-carbon semi-steel or high-carbon graphite steel is about 500MPa generally, and the hardness is 55-60HSC generally.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The large-sized high-chromium iron roll collar is characterized in that the alloy elements and the weight percentage content are as follows: 2.30-2.80% of C, 0.30-1.00% of Si, 0.50-1.20% of Mn, less than or equal to 0.10% of P, less than or equal to 0.05% of S, 12.0-22.0% of Cr, 0.70-1.70% of Ni, 0.60-1.50% of Mo, 0.10-0.80% of V, 0.70-1.70% of Cu, and the balance of Fe and inevitable impurities.
2. The large high-chromium iron roll collar according to claim 1, characterized in that the alloy elements and the weight percentage content are as follows: 2.50-2.70% of C, 0.50-0.70% of Si, 0.80-1.00% of Mn, less than or equal to 0.08% of P, less than or equal to 0.05% of S, 14-18% of Cr, 0.80-1.20% of Ni, 0.80-1.00% of Mo, 0.20-0.50% of V, 0.80-1.20% of Cu, and the balance of Fe and inevitable impurities.
3. A method for manufacturing a large high chromium iron roll collar according to claim 1 or 2, characterized in that it comprises the following steps:
s1, modeling: molding an outer ring and a core by using molding sand;
s2, smelting: smelting molten iron in an intermediate frequency furnace at 1450-1550 ℃;
s3, pouring: pouring the smelted molten iron into a cavity between the outer ring and the core by adopting a bottom pouring type static pouring method;
s4, unpacking: opening the box by heating after the pouring is finished;
s5, heat treatment and machining: and sequentially carrying out annealing treatment, machining and tempering treatment on the roll collar.
4. The method for manufacturing a large high chromium iron roll collar according to claim 3, wherein the outer ring and the core are molded using molding sand; the method specifically comprises the following steps: carrying out outer ring modeling on the inner surface of a cold mold with proper inner diameter, wherein the thickness of the hanging sand is 15mm, and uniformly coating high-temperature-resistant paint on the inner surface of the outer ring after compacting molding sand; core modeling is carried out on the outer surface of the steel pipe with proper outer diameter, high-temperature-resistant coating is uniformly coated on the outer surface of the core, and the surface of the steel pipe is provided with air holes which are uniformly distributed.
5. The method of manufacturing a large high ferrochrome roll collar according to claim 4, wherein in S1, molding sand for outer ring molding is chromite, molding sand for core molding is resin sand, and the refractory coating is alcohol-based zircon powder coating.
6. The method for manufacturing a large high chromium iron roll collar according to claim 3, characterized in that in the S4, the temperature of the hot open box is 500 ℃.
7. The method for preparing the large-sized high-chromium iron roll collar according to claim 6, wherein in the step S5, the annealing treatment is specifically as follows: and (3) putting the roll collar in the S4 into a high-temperature resistance furnace preheated to 500 ℃, preserving heat at 500 ℃, heating the roll collar to 850-1000 ℃ when the temperature is not changed, preserving heat for 15-20 h, cooling the furnace to below 100 ℃, taking out the roll collar, and air-cooling to normal temperature.
8. The method for preparing the large-sized high-chromium iron roll collar according to claim 7, wherein in the step S5, the tempering treatment is specifically as follows: heating the roll collar to 400-460 ℃ and preserving heat for 15-25h, and then cooling to normal temperature in air.
9. A preparation method of an assembled roller is characterized by comprising the following steps: the roll collar is prepared by the preparation method of the large-scale high-chromium iron roll collar in the claim 3, and comprises the following steps:
s10, matching processing: respectively carrying out rough machining on the outer surfaces of the roll collar and the mandrel, and then respectively carrying out finish machining on the assembly surfaces of the roll collar and the mandrel;
s20, assembling: carrying out base hole interference hot assembly on the roll collar and the mandrel to form an assembled roll;
s30, integral processing: and finishing the outer surface of the whole assembly type roller.
10. The fabricated roll manufacturing method of claim 9, wherein in the S20, the hot-assembling process is: and (3) putting the roll collar into a resistance furnace, heating to 300 ℃ at the speed of 10 ℃/h, preserving heat for 8h, assembling the roll collar outside the mandrel, and finally cooling to room temperature.
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| CN118045964A (en) * | 2024-04-16 | 2024-05-17 | 江苏凯达重工股份有限公司 | Preparation method for preparing large-sized high-chromium iron roll collar |
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