CN115233116B - Preparation method of finished product rack working roll suitable for high-strength steel rolling - Google Patents
Preparation method of finished product rack working roll suitable for high-strength steel rolling Download PDFInfo
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- CN115233116B CN115233116B CN202210871786.9A CN202210871786A CN115233116B CN 115233116 B CN115233116 B CN 115233116B CN 202210871786 A CN202210871786 A CN 202210871786A CN 115233116 B CN115233116 B CN 115233116B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- B22D1/002—Treatment with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a preparation method of a finished product rack working roll suitable for high-strength steel rolling, which is characterized in that rolling working conditions and using problems of special plates such as hot continuous rolling thin plates and silicon steel are researched and analyzed, an innovative method is adopted to finally obtain a solution suitable for a finish rolling rear section, especially a finished product rack, and the preparation method of the high-performance finished product rack working roll suitable for high-strength steel rolling such as silicon steel is obtained.
Description
Technical Field
The invention relates to a preparation method of a finished product rack working roll suitable for high-strength steel rolling, and belongs to the technical field of characteristic roll materials.
Background
Along with the increase of the proportion of special plates such as high-strength steel, sheet billet and the like of each rolling line, the application requirement of comprehensively realizing full-line high-speed steel is more urgent: how to improve the production line efficiency, how to obtain high-efficiency output within unit time and how to obtain more output of the roller in the machine period, and high-performance roller is certainly one of effective ways for solving the urgent demands at present. At present, the roughing and finishing rolling front sections are respectively provided with corresponding materials to meet the requirements of long roll service of a rolling line, and the finishing rolling rear section roll is still mainly high nickel-chromium at present due to the working condition characteristics of high surface quality requirements and tail flicking of the finishing rolling rear section stand, particularly the finished product stand. However, when the roller is used for rolling high added value products such as silicon steel, high-strength steel and the like, the service of the roller is short, and double-side waves exist on the surface of the roller, so that the research and development of the finish rolling rear section, particularly the finished product rack high-speed steel, is particularly critical to meet the rolling requirements of high surface quality and long roller service of the finish rolling rear section.
How to design the matrix components of the brand new finishing post section, especially the finished product frame working roll, how to design casting parameters, how to design the heat treatment process matched with the new material, and other technical parameters are the problems to be solved in the urgent need of developing high-performance finishing roll materials.
Disclosure of Invention
The invention finally obtains a solution suitable for the finish rolling later section, in particular to a finished product rack by researching and analyzing rolling working conditions and using problems of special plates such as hot continuous rolling thin plates, silicon steel and the like, provides a method for preparing a high-performance finished product rack working roll suitable for rolling high-strength steel such as silicon steel and the like, improves the wear resistance and hardness of a working layer, and solves the problems that the existing roll has short service of the roll and double-side waves when rolling high added value products such as silicon steel, high-strength steel and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a finished product rack working roll suitable for high-strength steel rolling comprises the following steps:
step A, adopting scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon and ferromanganese as initial furnace charges to carry out material mixing, and dividing the materials into an outer layer and a core material;
the working roll comprises the following chemical components in percentage by mass: 0.4-1.0% of C, 0.2-1.2% of Si, 0.2-1.5% of Mn, 2.0-8.0% of Cr, 0.2-3.0% of Ni, 3.0-12.0% of Mo, 2.0-10.0% of V, 0.3% or more of W and less than or equal to 0.8%,0.2% or more of Nb and less than or equal to 1.0% of Nb, and the balance of Fe, wherein the outer layer C also needs to satisfy: c is less than or equal to (0.06 xCr% +0.063 xMo% +0.033 xW% +0.235 xV% +0.13 xNb% +0.25 xTi%)/3; the carbide content of the outer layer is less than or equal to 2.0 percent;
the working roll core is made of graphite steel, and comprises the following chemical components in percentage by mass: 1.5 to 2.0 percent of C, 0.8 to 2.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.6 percent of Cr, 0.1 to 1.0 percent of Ni, 0.1 to 0.8 percent of Mo, less than or equal to 0.1 percent of V, the total content of other impurity elements is not more than 0.1 percent, and the balance is Fe;
step B, adopting an gray iron cold mold, and spraying 1-2mm zircon powder on the inner wall of the gray iron cold mold;
step C, smelting in an intermediate frequency furnace, after the outer layer molten steel is melted, raising the temperature to 1610-1710 ℃, preserving the heat for 5-10min, discharging, and reducing the temperature to 1550-1560 ℃ to start pouring; after the core molten steel is smelted, the temperature is raised to 1600-1700 ℃, the heat is preserved for 5-10min, the furnace is discharged, the temperature is reduced to 1500-1510 ℃ and the core is poured;
step D, unpacking the blank 50-100 hours after casting, and placing the unpacked blank in a high-temperature furnace for preliminary heat treatment;
and E, carrying out rough machining on the product, carrying out heat treatment after the rough machining is finished, and carrying out finish machining until the product is finished after the heat treatment is finished.
The technical scheme of the invention is further improved as follows: and B, preheating the gray iron cold type in the step before pouring, wherein the preheating temperature is 100-200 ℃ and the preheating time is 2-10h.
The technical scheme of the invention is further improved as follows: and C, argon blowing treatment is carried out before the casting of the outer molten steel in the step, and the argon blowing time is 2-10min.
The technical scheme of the invention is further improved as follows: the specific operation in the step D is that the preliminary heat treatment temperature is 960 ℃, the heat preservation time is 30 hours, the heating is finished, the cooling is carried out in an air cooling mode, the roller body is cooled to 520 ℃ and is charged, and the furnace cooling is carried out at the speed of less than or equal to 10 ℃/h after the heat preservation is carried out for 5-10 hours; or adopting the preliminary heat treatment temperature to be 930 ℃ and the heat preservation time to be 33 hours, cooling by adopting an air cooling mode after heating, charging the roller body to 510 ℃, and carrying out furnace cooling at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours; or adopting the preliminary heat treatment temperature to be 920 ℃ and the heat preservation time to be 35 hours, cooling by adopting an air cooling mode after heating, charging the furnace after cooling to the roller body to 530 ℃, and cooling the furnace at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours; or adopting the preliminary heat treatment temperature of 950 ℃ and the heat preservation time of 33 hours, cooling by adopting an air cooling mode after heating, charging the furnace after cooling to the roller body of 520 ℃, and cooling the furnace at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours.
The technical scheme of the invention is further improved as follows: the heat treatment mode in the step E is high-temperature heat treatment, an equal hard layer heat treatment technology is adopted, the radial and axial temperature difference of a working layer is controlled within the range of 5-10 ℃ within 5-10min, the heating time is 55-65min, the heating temperature of the working layer is 1000-1100 ℃, cooling is carried out by adopting a high-pressure spraying and air spraying mode, the cooling air pressure is 0.4-0.5MPa, the water pressure is 0.3-0.35MPa, the spraying is carried out for 10-30min, the air pressure is 0.3-0.5MPa, the blowing is carried out for 30-60min, the roll surface temperature is stopped at 430-460 ℃, the air cooling is carried out for 30-300min to the roll body of 200-500 ℃, the furnace is charged, tempering is carried out for 2-3 times, the tempering temperature is 500-600 ℃, and the heat preservation time is 25-50h.
The technical scheme of the invention is further improved as follows: the hardness of the roller body of the prepared working roller ranges from 80 to 90, and the hardness of the roller neck ranges from 38 to 50.
By adopting the technical scheme, the invention has the following technical progress:
the invention is based on the problems that the edge of the plate surface has side waves and the roller can not be lifted in the use process of the finish rolling rear section and the finished product frame of high nickel chromium, and researches are carried out on improving the wear resistance of materials and ensuring the uniformity of the material properties of the roller, the main alloy is led into a matrix to obtain the matrix with high wear resistance, so that the situation that the plate surface is influenced by uneven wear caused by excessive hard phase carbide mixed in the matrix is avoided, and a large amount of alloy elements are prevented from being in the form of carbide while the alloy elements are added, thereby limiting the addition content of carbide forming element C, namely
C≤(0.06×Cr％+0.063×Mo％+0.033×W％+0.235×V％+0.13×Nb％+0.25×Ti％)/3，
The carbide content is less than or equal to 2.0 percent, and the C content is limited by the invention, so that the carbide content is limited, alloy elements mainly enter the matrix to strengthen the matrix, and the aim of improving the wear resistance of the matrix is fulfilled.
The invention adopts the improvement matrix structure, the carbide content is limited, a proper amount of alloy elements form carbide, other alloy elements enter the matrix, the matrix is strengthened, the matrix strength is improved, the martensitic matrix structure is obtained, compared with the high nickel-chromium working roll used by a conventional finished product frame, the structure type becomes martensite, the matrix strength can reach more than HV630, the microhardness (HV is more than or equal to 520) of the high nickel-chromium matrix is obviously improved, meanwhile, a small amount of carbide is formed as a hard phase, and uneven abrasion of the carbide and the matrix caused by excessive carbide is avoided.
Drawings
FIG. 1 is a schematic view of the microstructure of the present invention;
FIG. 2 is a schematic view of the microstructure of a rough rolled high speed steel;
FIG. 3 is a schematic view of the microstructure of the finish rolling front section Gao Sugang;
fig. 4 is a schematic view of a high nickel chromium microstructure.
Detailed Description
The invention is further illustrated by the following examples:
example 1:
raw materials such as scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon, ferromanganese and the like are respectively utilized to smelt outer layer and core molten steel by a power frequency induction smelting furnace, and the mass percentage of each component of the outer layer reaches the design components: 0.46% of C, 0.95% of Si, 0.65% of Mn, less than or equal to 0.05% of P, less than or equal to 0.06% of S, 3.6% of Cr, 0.39% of Ni, 8.96% of Mo, 8.93% of V, 0.56% of W, 0.39% of Nb and the balance of Fe, wherein the core comprises the following components in percentage by mass: after standard components of 1.85% of C, 1.26% of Si, 0.85% of Mn, 0.35% of Cr, 0.19% of Ni, 0.13% of Mo and 0.06% of V, heating the outer layer molten steel to 1635 ℃ for tapping, blowing argon at 0.25MPa for 3.5min, pouring after the temperature is reduced to 1558 ℃, discharging the core molten steel from a furnace at 1620 ℃, and pouring at 1510 ℃; and opening the box 60 hours after casting. And (3) after opening the box, coarsely adding, preserving heat at 960 ℃ for 30 hours, then air-cooling, charging into a furnace when the air-cooling is carried out to the roller body at 520 ℃, and cooling the furnace at a cooling speed of 8 ℃/h. And (3) after the furnace cooling is finished, carrying out rough machining, roughly adding the rest of the diameter of the roll body by 5mm and the rest of the length of the roll body by 20mm, heating the roll body at 1050 ℃ for 60min by using a high-temperature heating furnace, spraying the roll body for 25min under the air pressure of 0.5MPa and the water pressure of 0.3MPa after the heating is finished, blowing air for 55min under the air pressure of 0.45MPa, carrying out air cooling to 350 ℃ for charging tempering, carrying out tempering and heat preservation at 530 ℃ for 35h, discharging the roll body after twice tempering, and carrying out subsequent machining to obtain a finished product.
As shown in fig. 1, which is an electron microscope picture of example 1, the high-performance finished product rack working roll has a small carbide content, and only precipitates secondary carbides at the grain boundary part, thereby playing a role in reinforcing second phase particles, and meanwhile, for silicon steel with high rolling temperature, the heat cracking resistance of the product is improved, and especially, the uniform abrasion in the axial direction and the radial direction of the working layer is realized by combining the equal hard layer heat treatment process technology of the working layer.
Example 2
Raw materials such as scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon, ferromanganese and the like are respectively utilized to smelt outer layer and core molten steel by a power frequency induction smelting furnace, and the mass percentage of each component of the outer layer reaches the design components: 0.89% of C, 0.93% of Si, 0.63% of Mn, less than or equal to 0.03% of P, less than or equal to 0.05% of S, 3.5% of Cr, 0.36% of Ni, 11.53% of Mo, 8.53% of V, 0.46% of W, 0.37% of Nb and the balance of Fe, wherein the core comprises the following components in percentage by mass: after standard components of 1.89% of C, 1.23% of Si, 0.86% of Mn, 0.31% of Cr, 0.16% of Ni, 0.11% of Mo and 0.05% of V, heating the outer layer molten steel to 1625 ℃ for tapping, blowing argon at 0.26MPa for 3.3min, pouring after the temperature is reduced to 1535 ℃, discharging the core molten steel from a furnace at 1610 ℃, and pouring at 1500 ℃; and opening the box 55h after casting. And (3) after opening the box, coarsely adding, preserving heat at 930 ℃ for 33 hours, then air-cooling, charging into a furnace when the air-cooling is carried out to the roller body at 510 ℃, and carrying out furnace cooling at a cooling speed of 9 ℃/h. And (3) after the furnace cooling is finished, carrying out rough machining, roughly adding the rest of the diameter of the roll body by 6mm and the rest of the length of the roll body by 15mm, heating the roll body by using a high-temperature heating furnace at 1080 ℃ for 55min, spraying the roll body for 28min under the wind pressure of 0.4MPa and the water pressure of 0.4MPa after the heating is finished, blowing the air for 56min under the wind pressure of 0.46MPa, carrying out air cooling to 380 ℃ for charging tempering, carrying out tempering heat preservation at 550 ℃ for 39h, discharging the furnace after twice tempering, and carrying out subsequent machining to obtain a finished product.
Example 3
Raw materials such as scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon, ferromanganese and the like are respectively utilized to smelt outer layer and core molten steel by a power frequency induction smelting furnace, and the mass percentage of each component of the outer layer reaches the design components: 0.95% of C, 0.80% of Si, 0.63% of Mn, less than or equal to 0.06% of P, less than or equal to 0.06% of S, 2.56% of Cr, 0.89% of Ni, 10.53% of Mo, 9.65% of V, 0.53% of W, 0.39% of Nb and the balance of Fe, wherein the core comprises the following components in percentage by mass: heating the outer layer molten steel to 1620 ℃ for tapping after standard components of 1.93% of C, 1.28% of Si, 0.89% of Mn, 0.35% of Cr, 0.19% of Ni, 0.15% of Mo and 0.06% of V, blowing argon for 3.9min at 0.25MPa, pouring after the temperature is reduced to 1539, discharging the core molten steel from a furnace at 1650 ℃, and pouring at 1500 ℃; and opening the box 53h after pouring. And (3) after opening the box, coarsely adding, preserving heat at 920 ℃ for 35 hours, then air-cooling, charging into a furnace when the air-cooling is carried out to the roller body at 530 ℃, and cooling the furnace at a cooling speed of 10 ℃/h. And (3) after the furnace cooling is finished, carrying out rough machining, roughly adding the rest of the diameter of the roll body by 8mm and the rest of the length of the roll body by 19mm, heating the roll body by using a high-temperature heating furnace at 1030 ℃ for 60min, spraying the roll body for 28min under the air pressure of 0.45MPa and the water pressure of 0.4MPa after the heating is finished, blowing air for 59min under the air pressure of 0.46MPa, carrying out air cooling to 500 ℃ for charging tempering, carrying out tempering heat preservation at 530 ℃ for 40h, discharging the roll body after twice tempering, and carrying out subsequent machining to obtain a finished product.
Example 4
Raw materials such as scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon, ferromanganese and the like are respectively utilized to smelt outer layer and core molten steel by a power frequency induction smelting furnace, and the mass percentage of each component of the outer layer reaches the design components: 0.35% of C, 0.75% of Si, 0.70% of Mn, less than or equal to 0.07% of P, less than or equal to 0.05% of S, 2.39% of Cr, 0.75% of Ni, 11.35% of Mo, 8.53% of V, 0.36% of W, 0.41% of Nb and the balance of Fe, wherein the core comprises the following components in percentage by mass: after standard components of 1.79% of C, 1.21% of Si, 0.81% of Mn, 0.23% of Cr, 0.11% of Ni, 0.11% of Mo and 0.03% of V, heating the outer layer molten steel to 1650 ℃ for tapping, blowing argon at 0.29MPa for 4.5min, pouring after the temperature is reduced to 1520 ℃, discharging the core molten steel from a furnace at 1635 ℃, and pouring at 1512 ℃; and opening the box 56h after casting. And (3) after opening the box, coarsely adding, preserving heat at 950 ℃ for 33 hours, then air-cooling, charging into a furnace when the air-cooling is carried out to the roller body at 520 ℃, and carrying out furnace cooling at a cooling speed of 9 ℃/h. And (3) after the furnace cooling is finished, carrying out rough machining, roughly adding the rest of the diameter of the roll body by 6mm and the rest of the length of the roll body by 17mm, heating for 65min at 1085 ℃ by using a high-temperature heating furnace, spraying 26min on the roll body under the pressure of 0.49MPa and the water pressure of 0.41MPa after the heating is finished, blowing for 55min under the pressure of 0.49MPa, carrying out air cooling to 520 ℃ for charging tempering, carrying out tempering heat preservation for 39h at 550 ℃, discharging after tempering twice, and carrying out subsequent machining to obtain a finished product.
Example 5
Raw materials such as scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon, ferromanganese and the like are respectively utilized to smelt outer layer and core molten steel by a power frequency induction smelting furnace, and the mass percentage of each component of the outer layer reaches the design components: 0.65% of C, 0.79% of Si, 0.69% of Mn, less than or equal to 0.06% of P, less than or equal to 0.07% of S, 2.31% of Cr, 0.76% of Ni, 11.39% of Mo, 7.56% of V, 0.36% of W, 0.41% of Nb and the balance of Fe, wherein the core comprises the following components in percentage by mass; after standard components of 1.79% of C, 1.21% of Si, 0.81% of Mn, 0.23% of Cr, 0.11% of Ni, 0.11% of Mo and 0.03% of V, heating the outer layer molten steel to 1650 ℃ for tapping, blowing argon at 0.29MPa for 4.5min, pouring after the temperature is reduced to 1520 ℃, discharging the core molten steel from a furnace at 1635 ℃, and pouring at 1512 ℃; and opening the box 56h after casting. And (3) after opening the box, coarsely adding, preserving heat at 950 ℃ for 33 hours, then air-cooling, charging into a furnace when the air-cooling is carried out to the roller body at 520 ℃, and carrying out furnace cooling at a cooling speed of 9 ℃/h. And (3) after the furnace cooling is finished, carrying out rough machining, roughly adding the rest of the diameter of the roll body by 6mm and the rest of the length of the roll body by 17mm, heating for 65min at 1085 ℃ by using a high-temperature heating furnace, spraying 26min on the roll body under the pressure of 0.49MPa and the water pressure of 0.41MPa after the heating is finished, blowing for 55min under the pressure of 0.49MPa, carrying out air cooling to 520 ℃ for charging tempering, carrying out tempering heat preservation for 39h at 550 ℃, discharging after tempering twice, and carrying out subsequent machining to obtain a finished product.
Example 6
Example 6 is a control, a rough rolled high speed steel roll, and an electron micrograph is shown in FIG. 2.
EXAMPLE 7
Example 7 is a control example, a finish rolled high speed steel roll, and an electron micrograph is shown in FIG. 3.
EXAMPLE 8
Example 8 is a control, high nickel chromium work roll and electron micrograph is shown in figure 4.
The products of examples 1 to 7 were used for tensile mechanical property detection of samples, and the performance detection was carried out according to national standard GB/T228. The detection results are shown in Table 1.
Table 1 results of testing tensile mechanical properties of example products
The hardness, the wear resistance and the impact resistance of the roller body of the rough rolling working roller made of the new material are compared, the hardness of the working roller of the finished product rack with the new performance is slightly higher than that of rough rolling high-speed steel, the wear resistance is higher than that of the rough rolling high-speed steel, the wear resistance is equal to that of the finish rolling high-speed steel, the impact resistance, namely the accident resistance, is higher than that of the rough rolling high-speed steel and the finish rolling high-speed steel, the working roller is applicable to abnormal working conditions such as tail flicking of the finished product rack, and compared with the existing high-nickel-chromium material applied to the finish rolling rear section, the hardness, the wear resistance and the accident resistance of the working roller with the new performance are all obviously higher than those of the conventional high-nickel-chromium working roller.
Experimental data shows that the high-performance finished product rack working roller can realize uniform abrasion of a working layer, has excellent accident resistance, can greatly prolong the on-machine period compared with the existing high-nickel-chromium working roller, achieves 2 times or more of the on-machine period of the high-nickel-chromium working roller, and can be suitable for rolling special plates such as silicon steel, thin plates and the like.
By comparing the microstructure of the invention with that of the rough rolling high-speed steel, the finish rolling front section Gao Sugang and the high nickel chromium, the invention can find that the carbides of the rough rolling high-speed steel roller are distributed in a similar net shape, the carbide content of the roller in the finish rolling front section Gao Sugang is more, the carbide of the high nickel chromium roller is too dense and coarse, and the roller exists: 1) The hot cracking is serious when silicon steel with higher rolling temperature is rolled; 2) The uniform abrasion of the matrix can be influenced in the use process; the number of carbide in the matrix is less, and a small amount of granular carbide is only precipitated on the grain boundary, so that the uniform abrasion of a working layer can be realized, the anti-accident performance is excellent, the on-machine period is greatly prolonged, the rolling machine is suitable for rolling special plates such as silicon steel, thin plates and the like, and meanwhile, the problem that side waves exist at the side part of a plate surface in the use process is solved.
Claims (5)
1. A preparation method of a finished product rack working roll suitable for high-strength steel rolling is characterized by comprising the following steps: the method comprises the following steps:
step A, adopting scrap steel, ferrovanadium, ferromolybdenum, ferrosilicon and ferromanganese as initial furnace charges to carry out material mixing, and dividing the materials into an outer layer and a core material;
the working roll comprises the following chemical components in percentage by mass: 0.4-1.0% of C, 0.2-1.2% of Si, 0.2-1.5% of Mn, 2.0-8.0% of Cr, 0.2-3.0% of Ni, 3.0-12.0% of Mo, 2.0-10.0% of V, 0.3% or more of W and less than or equal to 0.8%,0.2% or more of Nb and less than or equal to 1.0% of Nb, and the balance of Fe, wherein the outer layer C also needs to satisfy: c is less than or equal to (0.06 xCr% +0.063 xMo% +0.033 xW% +0.235 xV% +0.13 xNb% +0.25 xTi%)/3; the carbide content of the outer layer is less than or equal to 2.0 percent;
the working roll core is made of graphite steel, and comprises the following chemical components in percentage by mass: 1.5 to 2.0 percent of C, 0.8 to 2.0 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.6 percent of Cr, 0.1 to 1.0 percent of Ni, 0.1 to 0.8 percent of Mo, less than or equal to 0.1 percent of V, the total content of other impurity elements is not more than 0.1 percent, and the balance is Fe;
step B, adopting an gray iron cold mold, and spraying 1-2mm zircon powder on the inner wall of the gray iron cold mold;
step C, smelting in an intermediate frequency furnace, after the outer layer molten steel is melted, raising the temperature to 1610-1710 ℃, preserving the heat for 5-10min, discharging, and reducing the temperature to 1550-1560 ℃ to start pouring; after the core molten steel is smelted, the temperature is raised to 1600-1700 ℃, the heat is preserved for 5-10min, the furnace is discharged, the temperature is reduced to 1500-1510 ℃ and the core is poured;
step D, unpacking the blank 50-100 hours after casting, and placing the unpacked blank in a high-temperature furnace for preliminary heat treatment;
step E, rough machining is carried out on the product, heat treatment is carried out after the rough machining is finished, and finish machining is carried out until the product is finished after the heat treatment is finished;
the heat treatment mode in the step E is high-temperature heat treatment, an equal hard layer heat treatment technology is adopted, the radial and axial temperature difference of a working layer is controlled within the range of 5-10 ℃ within 5-10min, the heating time is 55-65min, the heating temperature of the working layer is 1000-1100 ℃, cooling is carried out by adopting a high-pressure spraying and air spraying mode, the cooling air pressure is 0.4-0.5MPa, the water pressure is 0.3-0.35MPa, the spraying is carried out for 10-30min, the air pressure is 0.3-0.5MPa, the blowing is carried out for 30-60min, the roll surface temperature is stopped at 430-460 ℃, the air cooling is carried out for 30-300min to the roll body of 200-500 ℃, the furnace is charged, tempering is carried out for 2-3 times, the tempering temperature is 500-600 ℃, and the heat preservation time is 25-50h.
2. The method for manufacturing the finished product rack working roll suitable for rolling high-strength steel according to claim 1, wherein the method comprises the following steps of: and B, preheating the gray iron cold type in the step before pouring, wherein the preheating temperature is 100-200 ℃ and the preheating time is 2-10h.
3. The method for manufacturing the finished product rack working roll suitable for rolling high-strength steel according to claim 1, wherein the method comprises the following steps of: and C, argon blowing treatment is carried out before the casting of the outer molten steel in the step, and the argon blowing time is 2-10min.
4. The method for manufacturing the finished product rack working roll suitable for rolling high-strength steel according to claim 1, wherein the method comprises the following steps of: the specific operation in the step D is that the preliminary heat treatment temperature is 960 ℃, the heat preservation time is 30 hours, the heating is finished, cooling is carried out in an air cooling mode, the roller body is cooled to 520 ℃ and is charged, and furnace cooling is carried out at the speed of less than or equal to 10 ℃/h after heat preservation is carried out for 5-10 hours; or adopting the preliminary heat treatment temperature to be 930 ℃ and the heat preservation time to be 33 hours, cooling by adopting an air cooling mode after heating, charging the roller body to 510 ℃, and carrying out furnace cooling at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours; or adopting the preliminary heat treatment temperature to be 920 ℃ and the heat preservation time to be 35 hours, cooling by adopting an air cooling mode after heating, charging the furnace after cooling to the roller body to 530 ℃, and cooling the furnace at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours; or adopting the preliminary heat treatment temperature of 950 ℃ and the heat preservation time of 33 hours, cooling by adopting an air cooling mode after heating, charging the furnace after cooling to the roller body of 520 ℃, and cooling the furnace at the speed of less than or equal to 10 ℃/hour after heat preservation for 5-10 hours.
5. The method for manufacturing the finished product rack working roll suitable for rolling high-strength steel according to claim 1, wherein the method comprises the following steps of: the hardness of the roller body of the prepared working roller ranges from 80 to 90, and the hardness of the roller neck ranges from 38 to 50.
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