CN112831719A - Durable high-speed steel roller and manufacturing method thereof - Google Patents
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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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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- 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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- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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Abstract
The invention discloses a durable high-speed steel roller and a manufacturing method thereof, belonging to the technical field of machining and casting. The roll comprises a roll neck and a roll body consisting of a working layer and a core part, wherein the working layer comprises the following chemical components: 1.5-2.5% of C, 0.90-1.50% of Si, 0.40-1.40% of Mn and less than or equal to 0.03% of P; less than or equal to 0.03 percent of S, 9.00-14.00 percent of Cr, 0.50-2.00 percent of Ni, 7.00-12.00 percent of Mo, 1.00-3.00 percent of V, 0.5-2.5 percent of W, 0.10-1.00 percent of Nb, and the balance of Fe and inevitable impurities. By designing reasonable alloy components and a heat treatment process, the problems of serious heat cracking and large accident loss of the conventional high-speed steel material in the use of the hot rolled plate strip finish rolling front section are effectively solved, and the applicability of the high-speed steel material roller is improved.
Description
Technical Field
The invention relates to a roller and a manufacturing method thereof, in particular to a durable high-speed steel roller with excellent impact resistance, thermal crack resistance and accident resistance, which is suitable for a hot-rolled plate strip rolling line, and a manufacturing method thereof.
Background
With continuous innovation of roller technology and market production requirements, common material rollers are gradually replaced by high-new material rollers, the use of the rollers enters the use stage of full-line high-speed steel rollers, the high-speed steel rollers fully show the advantages in the aspects of wear resistance and roller shape maintenance with the specific performance, and the high-speed steel rollers are used in the mature front-section stand before finish rolling of a hot-rolled plate strip rolling line. However, the use of high-speed steel is still limited by a plurality of problems in the aspects of impact resistance, heat crack resistance, easy slip and the like, and although the frames are different, the three aspects are summarized: rolling load is high, and an oxide film falls off: the majority is due to the non-lubricated rolling; poor cooling capability and hot cracking of the roll surface: the situation of improving the yield and increasing the rolling rhythm is inevitable. Poor stability of the rolling line and large accident loss of the roller: this may be the entire line or individual racks. Generally, by optimizing rolling load distribution; lubrication rolling is added; the improvement of the rolling line such as strengthening cooling and the like can be improved; the anti-accident performance of the high-speed steel roll is improved, and the development of the durable high-speed steel with impact resistance and fatigue resistance is a better choice.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a durable high-speed steel roller with excellent impact resistance, thermal cracking resistance and accident resistance suitable for a hot-rolled plate strip rolling line and a manufacturing method thereof, so that the problems of serious thermal cracking and large accident loss existing in the use of the conventional high-speed steel material at the front stage of the finish rolling of a hot-rolled plate strip are effectively solved, the cooling water and the rolling parameters of the rolling line do not need to be specially adjusted when the roller is used, and the applicability of the high-speed steel roller is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a durable high-speed steel roller comprises a roller neck and a roller body consisting of a working layer and a core part, wherein the working layer comprises the following chemical components: 1.5-2.5% of C, 0.90-1.50% of Si, 0.40-1.40% of Mn and less than or equal to 0.03% of P; less than or equal to 0.03 percent of S, 9.00-14.00 percent of Cr, 0.50-2.00 percent of Ni, 7.00-12.00 percent of Mo, 1.00-3.00 percent of V, 0.5-2.5 percent of W, less than or equal to 1.0 percent of Nb, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved as follows: the percentage of Mo and W in the chemical composition of the working layer can be changed, and the Mo can be reduced to 0 at most by increasing 2% of W for every 1% of Mo reduction.
The technical scheme of the invention is further improved as follows: the parts of the roll neck and the roll body except the working layer are made of one or more of nodular cast iron and graphite steel.
The technical scheme of the invention is further improved as follows: the manufacturing method of the durable high-speed steel roller comprises the steps of smelting, modification treatment, centrifugal casting of an outer layer, core filling and heat treatment, and is characterized in that:
a) smelting: smelting the waste steel and alloy serving as raw materials in an induction furnace according to chemical components of the working layer of the roller body, wherein the smelting temperature is 1500-1600 ℃;
b) modification treatment: treating with rare earth magnesium, wherein the dosage of the rare earth magnesium treatment is 0.3-1.0% of the molten steel amount;
c) centrifugally casting an outer layer and a filling core: the working layer of the roller body is poured in a centrifugal mode, when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and then the solidified casting is unpacked;
d) performing preliminary heat treatment: performing stress relief annealing on the casting, wherein the annealing temperature is 500-900 ℃, the heat preservation time is 50-80 hours, and cooling along with the furnace after the heat preservation is finished; then machining the required size and precision;
e) final heat treatment: carrying out heat treatment on the surface of the roller by adopting a differential quenching method, wherein the quenching temperature is 1000-1200 ℃, the quenching heat preservation time is 2-10 hours, and cooling is carried out by adopting a spray or air blast cooling mode; the tempering temperature is 450-550 ℃, and the tempering time is 120-170 hours in total.
The technical scheme of the invention is further improved as follows: the centrifugation mode of the step c) comprises horizontal centrifugation and vertical centrifugation.
The technical scheme of the invention is further improved as follows: and (4) performing stress relief annealing treatment after the casting is unpacked.
The technical scheme of the invention is further improved as follows: the differential temperature quenching mode in the step e) is a treatment mode of only heating the roller body working layer area to the quenching temperature through flame, resistance, induction and the like.
The technical scheme of the invention is further improved as follows: the matrix structure of the roller is a martensite structure, and the matrix hardness is more than HV 550; eutectic and point carbide with the content of 12-20% are dispersed in the matrix to form a wear-resistant mass point, and the hardness of the roll body is HSD 75-85. Due to the adoption of the technical scheme, the invention has the technical progress that:
the invention combines the characteristics and working conditions of fast rolling rhythm of a front section rack of a hot rolled plate strip finish rolling, high temperature of a lower machine roller, serious hot cracking of a roller surface, F1 rack biting limitation, F3 and 4 using oxide film holding capacity, determines the components and the contents of alloy elements in the roller, designs a reasonable manufacturing process, adopts a centrifugal composite casting mode for production, and completes a durable high-speed steel roller with excellent impact resistance, thermal cracking resistance and accident resistance and a manufacturing method thereof, wherein the roller is suitable for a hot rolled plate strip rolling line, the matrix tissue is a martensite tissue, and the matrix hardness is more than HV 550; eutectic and point carbide with the content of 12-20% are dispersed in the matrix to form a wear-resistant mass point, and the hardness of the roll body is HSD 75-85. The problems of serious heat cracking and large accident loss of the conventional high-speed steel material in the use of the front section of finish rolling of a hot rolled plate strip are effectively solved, and the cooling water and the rolling parameters of a rolling line do not need to be specially adjusted when the roller is used, so that the applicability of the high-speed steel roller is improved. The rolling mill is suitable for the working roll of the hot-rolled plate strip rack and can better meet the rolling requirement.
Drawings
FIG. 1 is a photograph of the metallographic structure of a durable high-speed steel roll according to the present invention.
Detailed Description
The durable high-speed steel roller with excellent impact resistance, thermal crack resistance and accident resistance for the rolling line of the hot-rolled plate strip comprises a roller neck and a roller body consisting of a working layer and a core part, wherein the working layer comprises the following chemical components: 1.5-2.5% of C, 0.90-1.50% of Si, 0.40-1.40% of Mn and less than or equal to 0.03% of P; less than or equal to 0.03 percent of S, 9.00-14.00 percent of Cr, 0.50-2.00 percent of Ni, 7.00-12.00 percent of Mo, 1.00-3.00 percent of V, 0.5-2.5 percent of W, less than or equal to 1.0 percent of Nb, and the balance of Fe and inevitable impurities.
The manufacturing process comprises the following steps of smelting, modification treatment, centrifugal casting of an outer layer and core filling, and heat treatment:
a) smelting: the working layer of the roller body takes scrap steel and alloy as raw materials, and smelting is carried out in an induction furnace, wherein the smelting temperature is 1500-1600 ℃;
b) the modification treatment adopts rare earth magnesium treatment, and the dosage of the rare earth magnesium treatment is 0.3-1.0% of the molten steel amount.
c) Centrifugally casting an outer layer and a filling core: the working layer of the roller body is poured in a centrifugal mode, when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and then the solidified casting is unpacked;
d) performing preliminary heat treatment: performing stress relief annealing on the casting, wherein the annealing temperature is 500-900 ℃, the heat preservation time is 50-80 hours, and cooling along with the furnace after the heat preservation is finished; then machining the required size and precision;
e) final heat treatment: carrying out heat treatment on the surface of the roller by adopting a differential quenching method, wherein the quenching temperature is 1000-1200 ℃, the quenching heat preservation time is 2-10 hours, and cooling is carried out by adopting a spray or air blast cooling mode; the tempering temperature is 450-550 ℃, and the tempering time is 120-170 hours in total.
FIG. 1 is a photograph of the metallographic structure of a durable high-speed steel roll for hot rolled strip lines according to the present invention, which is excellent in impact resistance, hot cracking resistance and accident resistance; the microstructure of the working layer is a photograph magnified by 500 times and photographed by an optical microscope under a corrosion state, white is carbide, and black is a martensite matrix.
The present invention will be described in further detail with reference to the following examples:
example 1
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 1.55%, Si: 0.98%, Mn: 0.45%, P: 0.015%, S: 0.020%, Cr: 9.8%, Ni 1.00%, Mo 7.9%, V1.15%, Nb: 0.1%, W: 1.52 and the balance Fe. The working layer of the roller body is cast in a centrifugal mode, and when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are cast through core filling; and opening the solidified casting. Performing stress relief annealing on the casting, performing heat treatment on the surface of the roller by adopting a differential temperature quenching method, performing tempering treatment after cooling by adopting a spray or air-blast cooling mode, and detecting that the matrix is martensite, the microhardness of the matrix is 580Hv, the carbide content is 12.5 percent, and the hardness of the roller body is HSD 76-78.
Example 2
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 1.72%, Si: 0.99%, Mn: 0.58%, P: 0.015%, S: 0.021%, Cr: 10.3%, Ni 1.20%, Mo 8.50%, V1.45%, Nb: 0.4%, W: 0.98 percent and the balance of Fe. And the working layer of the roller body is poured in a centrifugal mode, and when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and the solidified casting is unpacked. Performing stress relief annealing on the casting, performing heat treatment on the surface of the roller by adopting a differential temperature quenching method, performing tempering treatment after cooling by adopting a spray or air-blast cooling mode, and detecting that the matrix is martensite, the microhardness of the matrix is 620Hv, the carbide content is 14.5 percent, and the hardness of the roller body is HSD 78-80.
Example 3
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 1.85%, Si: 1.15%, Mn: 0.55%, P: 0.015%, S: 0.020%, Cr: 11.5%, Ni 0.90%, Mo 9.2%, V1.70%, Nb: 0.2%, W: 2.35 percent and the balance of Fe. And the working layer of the roller body is poured in a centrifugal mode, and when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and the solidified casting is unpacked. Performing stress relief annealing on the casting, performing heat treatment on the surface of the roller by adopting a differential temperature quenching method, performing tempering treatment after cooling by adopting a spray or air-blast cooling mode, and detecting that the matrix is martensite, the microhardness of the matrix is 610Hv, the carbide content is 13.8 percent, and the hardness of the roller body is HSD 78-81.
Example 4
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 1.95%, Si: 1.32%, Mn: 1.30%, P: 0.012%, S: 0.022%, Cr: 13.5%, Ni 1.50%, Mo 11.5%, V2.20%, Nb: 0.4%, W: 1.42 percent and the balance of Fe. And the working layer of the roller body is poured in a centrifugal mode, and when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and the solidified casting is unpacked. Performing stress relief annealing on the casting, performing heat treatment on the surface of the roller by adopting a differential temperature quenching method, performing tempering treatment after cooling by adopting a spray or air-blast cooling mode, and detecting that the matrix is martensite, the microhardness of the matrix is 650Hv, the carbide content is 15.9 percent, and the hardness of the roller body is HSD 80-83.
Example 5
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 2.10%, Si: 1.12%, Mn: 0.85%, P: 0.012%, S: 0.022%, Cr: 12.5%, Ni 1.80%, Mo 10.5%, V2.86%, Nb: 0.5%, W: 2.32 percent and the balance of Fe. And the working layer of the roller body is poured in a centrifugal mode, and when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and the solidified casting is unpacked. Performing stress relief annealing on the casting, performing heat treatment on the surface of the roller by adopting a differential temperature quenching method, performing tempering treatment after cooling by adopting a spray or air-blast cooling mode, and detecting that the matrix is martensite, the microhardness of the matrix is 670Hv, the carbide content is 15.6 percent, and the hardness of the roller body is HSD 82-85.
Example 6
Scrap steel and alloy are adopted as raw materials and smelted in an induction furnace, and the range of the designed components of a working layer is reached: c: 1.55%, Si: 0.98%, Mn: 0.45%, P: 0.015%, S: 0.020%, Cr: 9.8%, Ni 1.00%, Mo 5.9%, V1.15%, Nb: 0.1%, W: 5.52 percent, and the balance being Fe. The difference from example 1 is that Mo decreases by 2% and W increases by 4% in proportion to 2W. By adopting the same manufacturing method, the detected matrix is martensite, the microhardness of the matrix is 562Hv, the carbide content is 13.2 percent, and the hardness of the roll body is HSD 75-77.
Example 7
Example 7 is a comparative example, and is a conventional high speed steel material.
The products of examples 1 to 7 were tested for their properties and the results are shown in Table 1.
Table 1 EXAMPLES Performance test results
Through the thermal shock and cold and hot fatigue performance tests of the developed durable high-speed steel roller material, the thermal shock crack depth of the developed durable high-speed steel roller is obviously lower than that of a high-speed steel roller, and meanwhile, the cold and hot fatigue performance is higher than that of a conventional high-speed steel roller.
According to the performance detection result, the developed durable high-speed steel roller has better impact resistance and thermal crack resistance and excellent accident resistance, meets the rolling characteristics of the hot-rolled plate strip, effectively solves the problems of serious hot cracking and large accident loss existing in the conventional high-speed steel material in the use of the front section of the hot-rolled plate strip finish rolling, and improves the applicability of the high-speed steel roller because the cooling water and the rolling parameters of a rolling line are not required to be specially adjusted when the roller is used.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. A durable high-speed steel roll is characterized in that: the roll comprises a roll neck and a roll body consisting of a working layer and a core part, wherein the working layer comprises the following chemical components: 1.5-2.5% of C, 0.90-1.50% of Si, 0.40-1.40% of Mn and less than or equal to 0.03% of P; less than or equal to 0.03 percent of S, 9.00-14.00 percent of Cr, 0.50-2.00 percent of Ni, 7.00-12.00 percent of Mo, 1.00-3.00 percent of V, 0.5-2.5 percent of W, less than or equal to 1.0 percent of Nb, and the balance of Fe and inevitable impurities.
2. A durable high speed steel roll according to claim 1, characterized in that: the percentage of Mo and W in the chemical composition of the working layer can be changed, and the Mo can be reduced to 0 at most by increasing 2% of W for every 1% of Mo reduction.
3. A durable high speed steel roll according to claim 1, characterized in that: the parts of the roll neck and the roll body except the working layer are made of one or more of nodular cast iron and graphite steel.
4. The manufacturing method of the durable high-speed steel roller comprises the steps of smelting, modification treatment, centrifugal casting of an outer layer, core filling and heat treatment, and is characterized in that:
a) smelting: smelting the waste steel and alloy serving as raw materials in an induction furnace according to chemical components of the working layer of the roller body, wherein the smelting temperature is 1500-1600 ℃;
b) modification treatment: treating with rare earth magnesium, wherein the dosage of the rare earth magnesium treatment is 0.3-1.0% of the molten steel amount;
c) centrifugally casting an outer layer and a filling core: the working layer of the roller body is poured in a centrifugal mode, when the solidification temperature of the working layer reaches a solidus line, the core and the roller neck are poured through core filling, and then the solidified casting is unpacked;
d) performing preliminary heat treatment: opening the casting, then performing stress relief annealing at the annealing temperature of 500-900 ℃ for 50-80 hours, and cooling along with the furnace after the heat preservation is finished; then machining the required size and precision;
e) final heat treatment: carrying out heat treatment on the surface of the roller by adopting a differential quenching method, wherein the quenching temperature is 1000-1200 ℃, the quenching heat preservation time is 2-10 hours, and cooling is carried out by adopting a spray or air blast cooling mode; the tempering temperature is 450-550 ℃, and the tempering time is 120-170 hours in total.
5. The method for manufacturing a durable high-speed steel roll according to claim 4, wherein: the centrifugation mode of the step c) comprises horizontal centrifugation and vertical centrifugation.
6. The method for manufacturing a durable high-speed steel roll according to claim 4, wherein: and (4) performing stress relief annealing treatment after the casting is unpacked.
7. The method for manufacturing a durable high-speed steel roll according to claim 4, wherein: the differential temperature quenching mode in the step e) is a treatment mode of only heating the roller body working layer area to the quenching temperature through flame, resistance, induction and the like.
8. A durable high speed steel roll according to claim 1, characterized in that: the matrix structure of the roller is a martensite structure, and the matrix hardness is more than HV 550; eutectic and point carbide with the content of 12-20% are dispersed in the matrix to form a wear-resistant mass point, and the hardness of the roll body is HSD 75-85.
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| CN114381665A (en) * | 2021-12-23 | 2022-04-22 | 中钢集团邢台机械轧辊有限公司 | Medium-thickness plate high-speed steel working roll and manufacturing method thereof |
| CN114807589A (en) * | 2022-03-31 | 2022-07-29 | 中钢集团邢台机械轧辊有限公司 | Martensite-bainite complex phase structure heat treatment control method of high-carbon high-speed steel |
| CN115233116A (en) * | 2022-07-22 | 2022-10-25 | 中钢集团邢台机械轧辊有限公司 | Preparation method of finished rack working roll suitable for high-strength steel rolling |
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|---|---|---|---|---|
| CN114381665A (en) * | 2021-12-23 | 2022-04-22 | 中钢集团邢台机械轧辊有限公司 | Medium-thickness plate high-speed steel working roll and manufacturing method thereof |
| CN114381665B (en) * | 2021-12-23 | 2023-07-14 | 中钢集团邢台机械轧辊有限公司 | Medium-thickness plate high-speed steel working roller and manufacturing method thereof |
| CN114807589A (en) * | 2022-03-31 | 2022-07-29 | 中钢集团邢台机械轧辊有限公司 | Martensite-bainite complex phase structure heat treatment control method of high-carbon high-speed steel |
| CN115233116A (en) * | 2022-07-22 | 2022-10-25 | 中钢集团邢台机械轧辊有限公司 | Preparation method of finished rack working roll suitable for high-strength steel rolling |
| CN115233116B (en) * | 2022-07-22 | 2023-12-12 | 中钢集团邢台机械轧辊有限公司 | Preparation method of finished product rack working roll suitable for high-strength steel rolling |
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| CN112831719B (en) | 2023-02-28 |
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