CN212370822U - Improved chromium alloy section steel finished product roller - Google Patents
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- CN212370822U CN212370822U CN202021157987.5U CN202021157987U CN212370822U CN 212370822 U CN212370822 U CN 212370822U CN 202021157987 U CN202021157987 U CN 202021157987U CN 212370822 U CN212370822 U CN 212370822U
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Abstract
The utility model relates to the technical field of rollers, in particular to an improved chromium alloy section steel finished roller, which comprises an upper roller and a lower roller which are arranged in parallel from top to bottom, wherein the upper roller is provided with at least one group of annular grooves along the length direction, and the lower roller is fixedly provided with annular bulges along the length direction relative to the positions of the annular grooves; the annular bulge is embedded in the annular groove, and the distance between the annular bulge and the annular groove forms a section steel hole pattern. The improved chromium alloy section steel finished roll has good wear resistance, strong impact toughness and crack resistance, and the rolling amount of the roll in the on-machine operation is improved by more than five; the manufacturing method has reasonable configuration and simple working procedures, can effectively ensure the use quality and the service life of the roller, and is convenient for wide popularization and use.
Description
Technical Field
The utility model belongs to the technical field of the technique of roll and specifically relates to an improved generation chromium alloy shaped steel finished product roll.
Background
In recent years, the production of various section steels in China develops rapidly, and the rolling yield of various section steels breaks through the hundred million tons of customs. In the rolling production process of the section steel, the specification, the shape, the size, the precision, the surface finish and the like of a section steel product are always the key points of strict control in the production process of the section steel, particularly the section steel with a complex section, and the requirements are met, so that the influence factors such as rolling force, the material quality, the rigidity, the process requirements, the rolling environment and the like of the section steel are in indispensable close connection with the comprehensive performance of a main rolling tool roller. At present, more traditional rollers are used for rolling various types of section steel at home and abroad, but because the traditional rollers are limited by rolling environment, fewer fine rollers completely meeting rolling requirements are needed. With the strong requirements of steel products, development of reduced green process equipment is needed to reduce the consumption of resources and energy and reduce the industrial policy of pollution to China and carbon emission, and new products with high performance, greenness, environmental protection and energy conservation are needed to be developed on the basis of technological innovation.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: in order to solve the problems in the prior art, the improved chromium alloy section steel finished roll is provided, the roll has good wear resistance, strong impact toughness and crack resistance, and the rolling amount of the roll in the operation on the machine is improved by more than five times; the manufacturing method has reasonable configuration and simple working procedures, can effectively ensure the use quality and the service life of the roller, and is convenient for wide popularization and use.
The utility model provides a technical scheme that its technical problem adopted is: an improved chromium alloy section steel finished product roller comprises an upper roller and a lower roller which are arranged in parallel from top to bottom, wherein the upper roller is provided with at least one group of annular grooves along the length direction, and the lower roller is fixedly provided with annular bulges along the length direction at positions corresponding to the annular grooves; the annular bulge is embedded in the annular groove, and the distance between the annular bulge and the annular groove forms a section steel hole pattern.
Further, in the above technical solution, the cross section of the annular groove is U-shaped, and the cross section of the annular protrusion is also U-shaped.
Further, in the above technical solution, two ends of the upper roller are respectively and fixedly provided with a first bearing stop, and one side of the first bearing stop is fixedly provided with a first flat-square transmission end.
Further, in the above technical solution, two ends of the lower roller are respectively and fixedly provided with a second bearing stop, and one side of the second bearing stop is fixedly provided with a second flat-square transmission end.
The manufacturing method of the improved chromium alloy section steel finished product roller comprises the following production steps: s1, preparing chemical components: c: 0.45 to 0.75 percent; si: 0.45 to 0.80 percent; mn: 0.45 to 0.80 percent; p is less than or equal to 0.020%; s is less than or equal to 0.020%; cr: 5.50% -6.50%; 0.50 to 0.80 percent of Ni; v: 0.50% -0.80%; nb: 0.15 to 0.30 percent; re is more than or equal to 0.05 percent; s2, smelting and pouring: smelting pure molten steel, and adding alloy when the temperature of the steel is 1450-1500 ℃; slagging for 10-30 min, and stirring for 3-5 min by using an electromagnetic stirrer; refining after slagging off; raising the temperature to 1550-1570 ℃ and then carrying out secondary slagging; adding 3-5 kg/ton of yttrium steel based heavy rare earth molten steel alterant after slagging to remove impurity elements; when the temperature of the steel is 1580-1620 ℃, adding aluminum in the furnace to 0.03-0.05% of steel, and tapping after 3-10 min; blowing argon into the steel ladle to enable micro slag to float upwards, stopping blowing for 3-10 min, calming molten steel for 6-10 min, and pouring when the temperature of the steel reaches the liquid phase temperature plus 30-50 ℃; s3, special heat treatment; and S4, turning the heat-treated product into a finished product.
Further, in the above technical scheme, the pouring in S2 adopts a top pouring process, and after the pouring is completed, the electromagnetic vibrator is started at a frequency of 60-120 times, so that the density of the molten steel is improved in the sequential solidification process, the crystalline microstructure is refined, and the loose zone is eliminated.
Further, in the above technical solution, the special heat treatment in S3 includes the following steps: s11, diffusion annealing temperature rising stage: when the roller is cooled to 500-600 ℃ in the mold, opening the mold, putting the roller into a furnace preheated to the same temperature, changing the phase temperature to 660-680 ℃, raising the temperature to 1050-1100 ℃ at the speed of 20-30 ℃/h, preserving the temperature for 15-40 h, and then air-cooling on a trolley; s22, spheroidizing temperature rise stage: the roller is air-cooled to 400-500 ℃, then is loaded into the trolley again, is heated to 780-850 ℃ at the speed of 20-30 ℃/h, is insulated for 15-30 h, and then is cooled to 500 ℃ in the furnace; s33, normalizing temperature rising stage: the temperature rising speed is 10-30 ℃/h, and the roller temperature is up to 920 +/-10 ℃; the heat preservation is that the diameter of the roller body is preserved for 1 hour every 25 mm; then the roller is hung on a frame for cooling; the distance between the shelf and the ground is more than or equal to 800 mm; s44, tempering and heating: cooling the roller on a frame to 200-300 ℃, then placing the roller in a furnace for tempering, keeping the temperature for 5-15 h when the temperature is raised to 500-560 ℃ at the temperature raising speed of 35-60 ℃/h, then cooling at 30-50 ℃/h, discharging the roller out of the furnace for air cooling when the temperature is raised to 200 ℃.
Further, in the technical scheme, the hardness of the roll body of the roll product in the S4 is 65-75 HSD, and the hardness fall is less than or equal to 1.5 HSD; the tensile strength of the roller is more than or equal to 580 MPa; the metallographic matrix structure of the finished roller product is a metal type MO2C6、V4C3NbC fine-grained carbides, tempered sorbite, bainite, and martensite.
Further, in the above technical solution, the slag former for primary slag formation in S1 is prepared by mixing lime, fluorite, carbon powder, silicon powder and calcium carbide.
Further, in the above technical solution, the slagging agent for secondary slagging in S1 is selected from 55-65% of CaO and 20-30% of CaC2Mixing with alkali powder.
The utility model has the advantages that: the improved chromium alloy section steel finished roll provided by the utility model has good wear resistance, strong impact toughness and crack resistance, and improves the rolling amount of the roll on-machine operation by more than five times; the manufacturing method has reasonable configuration and simple working procedures, can effectively ensure the use quality and the service life of the roller, and is convenient for wide popularization and use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the drawings are: 1. the roller comprises an upper roller body, 2, a lower roller body, 3, an annular groove, 4, an annular bulge, 5, a first bearing gear, 6, a first flat square transmission end, 7, a second bearing gear, 8 and a second flat square transmission end.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the improved chromium alloy section steel finished product roller comprises an upper roller 1 and a lower roller 2 which are arranged in parallel from top to bottom, wherein the upper roller 1 is provided with at least one group of annular grooves 3 along the length direction, and the lower roller 2 is fixedly provided with annular bulges 4 at positions corresponding to the annular grooves 3 along the length direction; the annular bulge 4 is embedded in the annular groove 3, and the distance between the annular bulge 4 and the annular groove 2 forms a section steel hole pattern.
Wherein, the section of the annular groove 2 is U-shaped, and the section of the annular bulge 4 is also U-shaped. Two ends of the upper roller 1 are respectively and fixedly provided with a first bearing retainer 5, and one side of the first bearing retainer 5 is fixedly provided with a first flat square transmission end 6. Two ends of the lower roller 2 are respectively and fixedly provided with a second bearing stop 7, and one side of the second bearing stop 7 is fixedly provided with a second flat square transmission end 8.
The manufacturing method of the improved chromium alloy section steel finished product roller comprises the following production steps: s1, preparing chemical components: c: 0.45 to 0.75 percent; si: 0.45 to 0.80 percent; mn: 0.45 to 0.80 percent; p is less than or equal to 0.020%; s is less than or equal to 0.020%; cr: 5.50% -6.50%; 0.50 to 0.80 percent of Ni; v: 0.50% -0.80%; nb: 0.15 to 0.30 percent; re is more than or equal to 0.05 percent; s2, smelting and pouring: smelting pure molten steel, and adding alloy when the temperature of the steel is 1450-1500 ℃; slagging for 10-30 min, and stirring for 3-5 min by using an electromagnetic stirrer; refining after slagging off; raising the temperature to 1550-1570 ℃ and then carrying out secondary slagging; adding 3-5 kg/ton of yttrium steel based heavy rare earth molten steel alterant after slagging to remove impurity elements; when the temperature of the steel is 1580-1620 ℃, adding aluminum in the furnace to 0.03-0.05% of steel, and tapping after 3-10 min; blowing argon into the steel ladle to enable micro slag to float upwards, stopping blowing for 3-10 min, calming molten steel for 6-10 min, and pouring when the temperature of the steel reaches the liquid phase temperature plus 30-50 ℃; s3, special heat treatment; and S4, turning the heat-treated product into a finished product.
Wherein, the top pouring process is adopted in the pouring in the S2, and the electromagnetic vibrator is started for 60-120 times after the pouring is finished, so that the density of the molten steel is improved in the sequential solidification process, the crystalline microstructure is refined, and a loose area is eliminated. The special heat treatment in S3 includes the steps of: s11, diffusion annealing temperature rising stage: when the roller is cooled to 500-600 ℃ in the mold, opening the mold, putting the roller into a furnace preheated to the same temperature, changing the phase temperature to 660-680 ℃, raising the temperature to 1050-1100 ℃ at the speed of 20-30 ℃/h, preserving the temperature for 15-40 h, and then air-cooling on a trolley; s22, spheroidizing temperature rise stage: the roller is air-cooled to 400-500 ℃, then is loaded into the trolley again, is heated to 780-850 ℃ at the speed of 20-30 ℃/h, is insulated for 15-30 h, and then is cooled to 500 ℃ in the furnace; s33, normalizing temperature rising stage: the temperature rising speed is 10-30 ℃/h, and the roller temperature is up to 920 +/-10 ℃; the heat preservation is that the diameter of the roller body is preserved for 1 hour every 25 mm; then the roller is hung on a frame for cooling; the distance between the shelf and the ground is more than or equal to 800 mm; s44,And (3) tempering and heating stage: cooling the roller on a frame to 200-300 ℃, then placing the roller in a furnace for tempering, keeping the temperature for 5-15 h when the temperature is raised to 500-560 ℃ at the temperature raising speed of 35-60 ℃/h, then cooling at 30-50 ℃/h, discharging the roller out of the furnace for air cooling when the temperature is raised to 200 ℃. The hardness of the roll body of the finished roll in S4 is 65-75 HSD, and the hardness fall is less than or equal to 1.5 HSD; the tensile strength of the roller is more than or equal to 580 MPa; the metallographic matrix structure of the finished roller product is a metal type MO2C6、V4C3NbC fine-grained carbides, tempered sorbite, bainite, and martensite. The slagging agent for primary slagging in the S1 is prepared by mixing lime, fluorite, carbon powder, silicon powder and calcium carbide. The slagging agent for secondary slagging in S1 is prepared from 55-65% of CaO and 20-30% of CaC2Mixing with alkali powder.
The first embodiment is as follows:
the manufacturing method of the improved chromium alloy section steel finished product roller comprises the following production steps: s1, preparing chemical components: c: 0.45 percent; si: 0.45 percent; mn: 0.45 percent; p: 0.010%; s: 0.0: 10%; cr: 5.50 percent; 0.50 percent of Ni; v: 0.50 percent; nb: 0.15 percent; re: 0.05 percent; s2, smelting and pouring: smelting pure molten steel, and adding alloy when the temperature of the steel is 1450 ℃; slagging once in 10min, and stirring for 3min by using an electromagnetic stirrer; refining after slagging off; raising the temperature to 1550 ℃ and then carrying out secondary slagging; adding 3 kg/ton of steel yttrium based heavy rare earth molten steel modificator after slagging to remove impurity elements; when the temperature of the steel is 1580 ℃, 0.03 percent of aluminum alloy is added into the furnace, and steel is tapped after 3 min; blowing argon into the steel ladle to allow micro slag to float upwards, stopping blowing for 3min, calming molten steel for 6min, and pouring when the temperature of the steel reaches the liquid phase temperature plus 30 ℃; s2, casting by adopting a top pouring process, starting an electromagnetic vibrator for 60 times after casting, improving the density of the molten steel in the sequential solidification process, refining a crystalline microstructure, and eliminating a loose area; s3, special heat treatment: s11, diffusion annealing temperature rising stage: when the roller is cooled to 500 ℃ in the mold, opening the mold, putting the roller into a furnace preheated to the same temperature, changing the phase temperature to 660 ℃, raising the temperature to 1050 ℃ at the speed of 20 ℃/h, preserving the temperature for 15h, and then air-cooling on a trolley; s22, spheroidizing temperature rise stage: the roller is air-cooled to 400 ℃, then is loaded into the trolley again, is heated to 780 ℃ at a speed of 20 ℃/h, is kept warm for 15h, and then is cooled to 500 ℃ in the furnace; s33, normalizing temperature rising stage: the temperature rising speed is 10 ℃/h, and the roller temperature is up to 920 ℃; the heat preservation is that the diameter of the roller body is preserved for 1 hour every 25 mm; then the roller is hung on a frame for cooling; the shelf is 900mm away from the ground; s44, tempering and heating: cooling the roller on a frame to 200 ℃, then placing the roller in a furnace for tempering, keeping the temperature for 5 hours when the temperature is raised to 500 ℃ at the temperature raising speed of 35 ℃/h, then cooling at 30 ℃/h, discharging the roller out of the furnace for air cooling after the temperature is raised to 200 ℃; and S4, turning the heat-treated product into a first finished product.
Example two:
the manufacturing method of the improved chromium alloy section steel finished product roller comprises the following production steps: s1, preparing chemical components: c: 0.60 percent; si: 0.60 percent; mn: 0.65 percent; p: 0.020%; s: 0.020%; cr: 5.80 percent; 0.70 percent of Ni; v: 0.65 percent; nb: 0.25 percent; re: 0.0: 6%; s2, smelting and pouring: smelting pure molten steel, and adding alloy when the temperature of the steel is 1480 ℃; slagging once in 25min, and stirring for 4min by using an electromagnetic stirrer; refining after slagging off; heating to 1560 ℃ and then carrying out secondary slagging; adding 4 kg/ton of steel yttrium based heavy rare earth molten steel alterant after slagging to remove impurity elements; when the temperature of the steel is 1600 ℃, adding 0.04% of aluminum into the furnace, and tapping after 5 min; blowing argon into the steel ladle to allow micro slag to float upwards, stopping blowing for 5min, calming molten steel for 8min, and pouring when the temperature of the steel reaches 40 ℃; s2, casting by adopting a top pouring process, starting an electromagnetic vibrator for 80 times after casting, improving the density of the molten steel in the sequential solidification process, refining a crystalline microstructure, and eliminating a loose area; s3, special heat treatment: s11, diffusion annealing temperature rising stage: when the roller is cooled to 550 ℃ in the mold, opening the mold, putting the roller into a furnace preheated to the same temperature, changing the phase temperature to 670 ℃, raising the temperature to 1060 ℃ at the speed of 25 ℃/h, preserving the temperature for 20h, and then cooling the roller on a trolley in air; s22, spheroidizing temperature rise stage: after the roller is cooled to 450 ℃, the roller is loaded into a trolley again, the temperature is raised to 830 ℃ at a speed of 25 ℃/h, the temperature is kept for 20h, and then the roller is cooled to 500 ℃ in the furnace; s33, normalizing temperature rising stage: the temperature rising speed is 20 ℃/h, and the roller temperature is up to 925 ℃; the heat preservation is that the diameter of the roller body is preserved for 1 hour every 25 mm; then the roller is hung on a frame for cooling; the stand is 950mm away from the ground; s44, tempering and heating: cooling the roller on a frame to 250 ℃, then placing the roller in a furnace for tempering, keeping the temperature for 10 hours when the temperature is increased to 530 ℃ at the speed of 45 ℃/h, then cooling at 40 ℃/h, discharging the roller out of the furnace for air cooling after the temperature is 200 ℃; and S4, turning the heat-treated product into a finished product II.
Example three:
the manufacturing method of the improved chromium alloy section steel finished product roller comprises the following production steps: s1, preparing chemical components: c: 0.75 percent; si: 0.80 percent; mn: 0.80 percent; p: 0.020%; s: 0.020%; cr: 6.30 percent; 0.67 percent of Ni; v: 0.70 percent; nb: 0.25 percent; re: 0.0: 8%; s2, smelting and pouring: smelting pure molten steel, and adding alloy when the temperature of the steel is 1500 ℃; slagging once in 30min, and stirring for 5min by using an electromagnetic stirrer; refining after slagging off; heating to 1570 ℃ and then carrying out secondary slagging; adding 5 kg/ton of steel yttrium based heavy rare earth molten steel alterant after slagging to remove impurity elements; when the temperature of the steel is 1620 ℃, adding 0.05 percent of aluminum alloy into the furnace, and tapping after 10 min; blowing argon into the steel ladle to allow micro slag to float upwards, stopping blowing for 10min, calming molten steel for 10min, and pouring when the temperature of the steel reaches 50 ℃ of the liquid phase temperature; s2, casting by a top pouring process, starting an electromagnetic vibrator for 120 times after casting, improving the density of the molten steel in the sequential solidification process, refining a crystalline microstructure, and eliminating a loose area; s3, special heat treatment: s11, diffusion annealing temperature rising stage: when the roller is cooled to 600 ℃ in the mold, opening the mold, putting the roller into a furnace preheated to the same temperature, changing the phase temperature to 680 ℃, raising the temperature to 1100 ℃ at the speed of 30 ℃/h, preserving the temperature for 40h, and then air-cooling on a trolley; s22, spheroidizing temperature rise stage: the roller is air-cooled to 500 ℃, then is loaded into the trolley again, is heated to 850 ℃ at a speed of 30 ℃/h, is kept warm for 30h, and then is cooled to 500 ℃ in the furnace; s33, normalizing temperature rising stage: the temperature rising speed is 30 ℃/h, and the roller temperature is 930 ℃; the heat preservation is that the diameter of the roller body is preserved for 1 hour every 25 mm; then the roller is hung on a frame for cooling; the shelf is 1000mm away from the ground; s44, tempering and heating: cooling the roller on a frame to 300 ℃, then placing the roller in a furnace for tempering, keeping the temperature for 15h when the temperature is raised to 560 ℃ at the speed of 60 ℃/h, then cooling at 50 ℃/h, discharging the roller out of the furnace for air cooling after the temperature is raised to 200 ℃; and S4, turning the heat-treated product into a finished product III.
And correspondingly detecting the three finished products, wherein the detection data are as follows:
| example one | Example two | EXAMPLE III | |
| Hardness of roll body (HSD) | 68 | 75 | 73 |
| Drop Hardness (HSD) | 0.8 | 0.3 | 1.0 |
| Roll tensile strength (MPa) | 595 | 680 | 653 |
The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. The improved chromium alloy section steel finished product roller is characterized in that: the device comprises an upper roller and a lower roller which are arranged in parallel up and down, wherein the upper roller is provided with at least one group of annular grooves along the length direction, and the lower roller is fixedly provided with annular bulges along the length direction at positions corresponding to the annular grooves; the annular bulge is embedded in the annular groove, and the distance between the annular bulge and the annular groove forms a section steel hole pattern.
2. The improved chromium alloy section steel finished roll according to claim 1, characterized in that: the section of the annular groove is U-shaped, and the section of the annular bulge is also U-shaped.
3. The improved chromium alloy section steel finished roll according to claim 1, characterized in that: and two ends of the upper roller are respectively and fixedly provided with a first bearing retainer, and one side of the first bearing retainer is fixedly provided with a first flat square transmission end.
4. The improved chromium alloy section steel finished roll according to claim 1, characterized in that: and two ends of the lower roller are respectively and fixedly provided with a second bearing block, and one side of the second bearing block is fixedly provided with a second flat square transmission end.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111790755A (en) * | 2020-06-19 | 2020-10-20 | 常州市瑞宏轧辊有限公司 | Improved chromium alloy section steel finished product roller and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111790755A (en) * | 2020-06-19 | 2020-10-20 | 常州市瑞宏轧辊有限公司 | Improved chromium alloy section steel finished product roller and manufacturing method thereof |
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