Finishing roll ring based on high-speed wire bar and preparation method of finishing roll ring

Abstract

The invention discloses a finishing roll collar based on high-speed wire bars and a preparation method of the finishing roll collar, and relates to the technical field of high-speed wire bar rolling, the high-speed wire bar finishing roll collar provided by the invention has the advantages of high tensile strength, high hardness, moderate toughness, good red hardness and high wear resistance; compared with a traditional tungsten carbide roll collar for a wire or bar rolling mill, the tungsten carbide roll collar has higher cost performance. According to the preparation method of the high-speed wire bar finishing roll collar, only common equipment such as an intermediate frequency furnace, a centrifugal casting machine and a heat treatment furnace is needed, the production process is simple, a metallographic structure mainly comprises high-hardness martensite and further contains 20-30% of high-hardness eutectic carbide, the hardness of the roll collar can reach 70.1 HRC, the red hardness is larger than 65 HRC at the temperature of 600 DEG C, the tensile strength is 900-1050 MPa, the fracture toughness is 75-85 MPa.m < 1 / 2 >, and the impact toughness is 16-20 J / cm < 2 >. The high-speed wire and bar finishing roll collar is free of cracking, peeling and fragmentation in use, good in wear resistance and suitable for being used on the high-speed wire and bar finishing roll collar, the steel rolling amount is equivalent to that of a tungsten carbide roll collar, and produced steel is smooth in surface and stable in size.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed wire rod rolling, and in particular to a high-speed wire rod finishing roller ring and a preparation method thereof. Background Art

[0002] At present, various finishing rollers of high-speed wire rod mills are mainly made of powder metallurgy tungsten carbide. Although rollers made of this material have the disadvantages of low strength and easy breakage, they have the advantages of high hardness, good red hardness and high wear resistance.

[0003] The prior art discloses some alloy ceramic roller rings with good wear resistance, such as: Chinese patent document CN1174764A discloses an alloy ceramic roller ring with good wear resistance, which uses tungsten carbide (WC) as the main component and is expensive. This roller ring must be formed by hot pressing and sintering, and the production process is complicated. In addition, non-metallic ceramics (aluminum oxide, zirconium oxide) are added to the roller ring, which damages the toughness of the roller ring and causes the roller ring to break during use. Summary of the invention

[0004] In order to solve the technical problems in the background technology, the purpose of the present invention is to provide a high-speed wire rod finishing roller ring and a preparation method thereof, the roller ring having the advantages of high tensile strength, high hardness, moderate toughness, good red hardness and high wear resistance to meet the working conditions of the high-speed wire rod finishing roller ring.

[0005] In order to achieve the above object, the present invention provides a high-speed wire rod finishing roller ring, the chemical composition (wt%) of which is as follows:

[0006] C: 3.01~3.6;

[0007] Si≦1.2;

[0008] Mn≦0.60;

[0009] P ≤ 0.05;

[0010] S≦0.05;

[0011] Ni: 0.3~2.0;

[0012] Cr: 4.0~8.0;

[0013] Mo: 8.01~8.5;

[0014] V: 10.01~11.0;

[0015] Nb: 1.0~4.0;

[0016] Al≦0.4;

[0017] Ti: 0.05~0.20;

[0018] Y: 0.05~0.15;

[0019] Ce: 0.05~0.15;

[0020] B: 0.05~0.10;

[0021] The balance is Fe.

[0022] The high-speed wire rod finishing roller ring is designed with the following components:

[0023] C: Too much C content will increase the brittleness of the material. When the reducing roller ring is working and in contact with the red-hot billet, if the C content is too high, the risk of cracks on the roller ring surface will increase, which will eventually lead to the rupture of the roller ring. Test results show that it is best to control the C content within 3.01-3.6%.

[0024] Si: Si is an indispensable reducing agent and deoxidizing element in the smelting process. Si can be dissolved in austenite to increase the yield strength and elastic limit of the matrix, improve the oxidation resistance of the matrix, and reduce the appearance of ring marks after the use of the reducing roller. However, excessive Si content will reduce the hardenability of the matrix. Therefore, its addition amount is controlled below 1.2%.

[0025] Mn: Mn element strongly hinders graphitization. When its content is high, it will cause serious segregation. Therefore, it is better to keep it as low as possible while meeting the performance requirements. Therefore, its content is controlled below 0.60%.

[0026] P: P has a low melting point and solidifies last. It will precipitate phosphorus eutectics along the grain boundaries, making the matrix structure brittle. Its content should be strictly controlled, so its content is controlled below ≤0.05%.

[0027] S: S is an anti-spheroidizing element. When its content is high, it is easy to produce low-melting-point Fe distributed on the grain boundaries, reducing strength and toughness. The content should be strictly controlled, so its content is controlled below ≤0.05%.

[0028] Ni: Ni is a non-carbide forming element, mainly dissolved in the matrix, improving the matrix toughness, so that the matrix provides good support for carbides, preventing carbides from peeling off during high-temperature wear, and is beneficial to improving the wear resistance of high-speed steel roll rings. However, if the Ni content is too high, the residual austenite in the quenching structure will increase, resulting in an increase in the number of roll ring tempering, so it is controlled at 0.3-2.0%.

[0029] Cr: Cr exists partially in M6C carbides in high-speed steel, and can also form M23C6 carbides, and about 40% exists in the matrix. Cr-containing M23C6 carbides are completely dissolved at lower quenching temperatures. Cr can also promote the better dissolution of M6C carbides in austenite, making high-speed steel have higher hardenability and hardenability. However, if the Cr content is too high, the excess Cr will participate in the formation of precipitated carbides during tempering. This Cr-containing carbide is easy to precipitate at lower temperatures, reducing the thermal stability of the steel. Therefore, considering comprehensively, its content is controlled at 4.0-8.0%.

[0030] Mo: Adding Mo to high-speed steel reduces the peritectic reaction temperature of the steel, reduces the remaining liquid phase of the reaction, and forms finer ledeburite at a lower temperature. The morphology of the ledeburite also changes, which can improve the fatal metallurgical defects of W-series high-speed steel: the unevenness of carbides, reduces brittleness, and at the same time, Mo dissolved in tempering can prevent carbides from precipitating along grain boundaries, thereby improving the strength and toughness of high-speed steel. In addition, the thermal stability of the residual austenite in high-speed steel with a Mo content of more than 3-4% is lower than that in W-series high-speed steel. One tempering can completely transform it, and two temperings can completely eliminate the stress in Mo-containing high-speed steel. However, Mo increases the decarburization sensitivity of high-speed steel and is also highly sensitive to the coarsening of the grains of high-speed steel. Therefore, its content is controlled at 8.01-8.5%.

[0031] V: In addition to purifying molten steel and reducing inclusions and gas content, V mainly forms high-hardness MC-type carbides in high-speed steel. It is difficult for MC to dissolve during high-temperature austenitization. Increasing the V content in high-speed steel can significantly improve wear resistance. However, if the V content is too high, cracks are likely to occur along the grain boundaries, the matrix is ​​prone to preferential wear, the rolled material adheres to the roller surface, and the roller surface is prone to roughness, which reduces the surface quality of the rolled material and accelerates the replacement cycle of the roller ring. In addition, too many MCs and too high hardness make grinding difficult, so its content is controlled at: 10.01~11.0%.

[0032] Nb: High-speed steel contains a lot of alloy elements such as Mo, Cr, and V. The density of these elements and the carbides they form is very different. Under the action of centrifugal force, segregation is easy to occur, which reduces the wear resistance of the roller ring. Adding Nb can form a denser MC-type composite carbide, reduce the density difference between carbides and melts, reduce segregation, and improve the wear resistance of the roller ring. However, Nb increases the quenching temperature of steel and reduces the temperature at which the secondary hardness peak appears, so its content is controlled at 1.0-4.0%.

[0033] Al: Al is dissolved in the matrix and can improve the tempering stability, hardness and red hardness of high-speed steel. Al also reduces the decomposition temperature of M2C eutectic carbide, making it easy to decompose and granulate eutectic carbide when heated at high temperature, which is beneficial to improve the toughness of high-speed steel. However, Al increases the decarburization sensitivity of high-speed steel, so its content is controlled below 0.4%.

[0034] Ti: Ti can refine the grains of high-speed steel, improve its strength, toughness and wear resistance, but reduce the red hardness of high-speed steel. Taking all factors into consideration, its content is controlled at 0.05-0.20%.

[0035] Y: Y can refine the grains of high-speed steel, limit dendrite segregation, improve mechanical properties, oxidation resistance and wear resistance, and its content is controlled at 0.05-0.15%.

[0036] Ce: Ce is a strong component supercooling element in steel alloys. During the solidification process, it is enriched in the melt at the front of the primary austenite growth through solute redistribution, causing component supercooling and refining the austenite dendrites. Due to the refinement of austenite dendrites, the eutectic steel liquid pool formed by segregation between austenite dendrites becomes smaller in the later stage of solidification, thereby refining the eutectic carbide and improving the strength and toughness of high-speed steel; therefore, its content is controlled at 0.05-0.15%.

[0037] B: The B element in pig iron forms boron carbonitride and niobium carbonitride with carbon and nitrogen in molten steel, which refines the grains, breaks the eutectic carbide network, and improves strength, toughness and high-temperature wear resistance.

[0038] As a general inventive concept, the present invention also provides a method for preparing a high-speed wire rod finishing roller ring, which adopts medium-frequency electric furnace smelting and centrifugal casting, and specifically comprises:

[0039] S1. Mix ordinary scrap steel, high-speed steel scrap, pig iron, ferromolybdenum, ferrochrome, ferrovanadium and nickel plate according to the predetermined composition requirements and put them into a medium frequency electric furnace for melting;

[0040] S2. When the temperature in front of the furnace rises to 1500-1700°C, ferroniobium particles are added to melt, and then 0.1-0.4% of the weight of the molten steel is added as an aluminum deoxidizer for alloying treatment;

[0041] S3, after drying, cerium silicate, yttrium iron and titanium iron are placed at the bottom of the ladle, and the molten steel is subjected to composite modification by the flushing method, and the chemical composition in the molten state is stabilized within the set range, and the components are adjusted in front of the furnace and then discharged from the furnace;

[0042] S4, forming the roller ring by centrifugal casting;

[0043] S5. After pouring, an antioxidant is sprinkled on the inner surface, and then the water spray cooling device above the water-cooled mold is turned on. After the molten steel is poured for a set time, the roller ring is taken out of the mold and directly placed in an insulation box without electricity for high-temperature annealing treatment, and rough processing is performed after annealing;

[0044] S6. After rough machining, the roller ring is subjected to high temperature quenching treatment. During quenching, the roller ring is heated to 1000-1180°C with the furnace and then kept warm for 2-6 hours. Then, it is quickly cooled to the martensite transformation temperature by mist cooling, and then subjected to medium temperature tempering treatment.

[0045] S7. Before finishing, the residual stress on the surface of the roller ring and the shallow surface residual austenite are tested, and the residual austenite is controlled below 5% before rolling on the machine;

[0046] S8. Finish machining to obtain roller rings with dimensional accuracy and surface finish that meet the requirements.

[0047] In a preferred embodiment of the present invention, in step S2, ferroniobium particles with a particle size of 2 mm are added.

[0048] In a preferred embodiment of the present invention, in step S3, cerium silica with a particle size of 10 mm and containing 30% cerium, yttrium iron with a particle size of 10 mm and containing 60% yttrium, and titanium iron with a particle size of 10 mm and containing 30% titanium are added.

[0049] In a preferred embodiment of the present invention, in step S4, the speed n of the centrifuge during casting is determined according to the following formula:

[0050]

[0051] Where G is the gravity coefficient, which ranges from 30 to 100; R is the inner radius of the casting thickness.

[0052] In a preferred embodiment of the present invention, in step S4, the casting material is 20 cast steel or heat-resistant ductile iron, the wall thickness is 80-150 mm, the preheating temperature is 150-200°C, and at this temperature, a layer of 2-5 mm coated sand is lined on the inner surface of the casting. After the casting is dried, it is installed on a horizontal centrifuge and waits for pouring. During pouring, the casting temperature is 80-120°C, the molten steel pouring temperature is 1440-1500°C, and the molten steel pouring speed is 2-8Kg / s.

[0053] In a preferred embodiment of the present invention, in step S5, after the high temperature annealing treatment is more than 24 hours, the roller ring is hoisted out and placed in a slow cooling pit for slow cooling, and the hardness of the roller ring after annealing is 25HRC to 35HRC.

[0054] In a preferred embodiment of the present invention, in step S5, the antioxidant is O-type glass slag.

[0055] In a preferred embodiment of the present invention, in step S5, the roller ring is taken out from the mold 20 to 30 minutes after the molten steel is poured.

[0056] In a preferred embodiment of the present invention, in step S6, the medium-temperature tempering treatment is repeatedly performed at least three times.

[0057] Compared with the prior art, the present invention has at least the following advantages:

[0058] (1) The high-speed wire rod finishing roller ring provided by the present invention has the advantages of high tensile strength, high hardness, moderate toughness, good red hardness and high wear resistance, and has a higher cost performance than the tungsten carbide roller ring used in traditional wire or rod rolling mills.

[0059] (2) The preparation method of the high-speed wire rod finishing roller ring of the present invention only requires common equipment such as a medium frequency furnace, a centrifugal casting machine, and a heat treatment furnace. The production process is simple, the metallographic structure is mainly high-hardness martensite, and also contains 20-30% high-hardness eutectic carbide. The roller ring hardness can reach 70.1HRC, and the red hardness is greater than 65HRC at 600°C, the tensile strength is 900-1050MPa, and the fracture toughness is 75-85MPa.m 1 / 2 , impact toughness 16~20J / cm 2 .

[0060] (3) The high-speed wire rod finishing roller ring of the present invention does not crack, peel or break during use and has good wear resistance. It is suitable for high-speed wire rod finishing roller rings. The steel rolling capacity is equivalent to that of tungsten carbide roller rings, and the produced steel has a smooth surface and stable dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 The metallographic image of the roller ring prepared in Example 1;

[0062] Figure 2 Metallographic image of the roller ring prepared in Example 2. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] The specific implementation of the present invention will be clearly and completely described below in conjunction with the embodiments and drawings.

[0065] Example 1

[0066] This embodiment provides a method for manufacturing a high-speed wire rod finishing roller ring, which adopts medium frequency electric furnace smelting and centrifugal casting, and includes the following steps:

[0067] S1. Mix common scrap steel, high-speed steel scrap, pig iron, ferromolybdenum, ferrochrome, ferrovanadium and nickel plate according to the roller ring composition requirements of Example 1 in Table 1 and put them into a medium frequency electric furnace for melting;

[0068] S2. When the temperature in front of the furnace rises to 1550°C, ferroniobium particles with a particle size of 2 mm are added to melt, and then 0.1% of aluminum by weight of the molten steel is added to deoxidize and alloy the molten steel before being taken out of the furnace;

[0069] S3, drying the cerium silica with a particle size of 10 mm and containing 30% cerium, the yttrium iron with a particle size of 10 mm and containing 60% yttrium, and the titanium iron with a particle size of 10 mm and containing 30% titanium at 100°C or above to remove moisture, and placing them at the bottom of the ladle, and subjecting the molten steel to composite modification by the flushing method, so that the contents of all element components in the molten state after smelting are stabilized within the content range of the roller ring components described in Example 1 in Table 1 below, and the components are adjusted in front of the furnace and qualified before being discharged from the furnace;

[0070] S4. Use centrifugal casting to form high-speed velvet rod finishing roller rings. The speed n of the centrifuge during casting is determined by the following formula:

[0071]

[0072] Where G is the gravity coefficient, which ranges from 30 to 100; R is the inner radius of the casting thickness.

[0073] During specific implementation, in this embodiment, the mold rotation speed is selected to be 500-900 rpm according to the inner radius of the roller ring.

[0074] In this embodiment, the mold material is 20 cast steel or heat-resistant ductile iron, with a wall thickness of 80-150 mm, a preheating temperature of 160 ° C, and at this temperature, a layer of 2-5 mm coated sand is lined on the inner surface of the mold. After the mold is dried, it is installed on a horizontal centrifuge to wait for pouring. During pouring, the mold temperature is 85 ° C, the molten steel pouring temperature is 1440 ° C, and the molten steel pouring speed is 4 Kg / s;

[0075] S5. After pouring, the inner surface is sprinkled with anti-oxidation O-type glass slag, and then the water spray cooling device above the water-cooled casting mold is turned on. 25 minutes after the molten steel pouring is completed, the roller ring is taken out from the casting mold and directly placed in an insulation box without electricity for high-temperature annealing. After more than 24 hours, it is hoisted out and placed in a slow cooling pit for slow cooling. The hardness of the roller ring after annealing is 25HRC, and rough processing is performed under this condition;

[0076] S6. After rough machining, the roller ring is subjected to high temperature quenching treatment. During quenching, the roller ring is heated to 1000°C with the furnace and then kept at this temperature for 4 hours. Then, it is rapidly cooled to the temperature before the martensitic transformation temperature by mist cooling, and then subjected to medium temperature tempering treatment (sufficient isothermal time). The tempering treatment is repeated at least three times.

[0077] S7. Before finishing, the residual stress on the surface of the roller ring and the shallow surface residual austenite are tested to control the residual austenite to less than 5% before rolling on the machine;

[0078] S8. Finish machining to obtain roller rings with dimensional accuracy and surface finish that meet the requirements.

[0079] The performance of the roller ring manufactured in this embodiment is shown in Example 1 in Table 2 below.

[0080] Example 2

[0081] This embodiment provides a method for manufacturing a high-speed wire rod fine roller ring, which is smelted in a medium-frequency electric furnace and centrifugally cast, and includes the following steps:

[0082] S1. Mix ordinary scrap steel, high-speed steel scrap, pig iron, ferrotungsten, ferromolybdenum, ferrochrome, ferrovanadium and nickel plate according to the roller ring composition requirements of Example 2 in Table 1 and put them into a medium frequency electric furnace for melting;

[0083] S2. When the temperature in front of the furnace rises to 1660°C, 2mm ferroniobium particles are added for melting, and then 0.4% aluminum by weight of the molten steel is added for deoxidation and alloying before being taken out of the furnace;

[0084] S3, drying the cerium silica with a particle size of 10 mm and containing 30% cerium, the yttrium iron with a particle size of 10 mm and containing 60% yttrium, and the titanium iron with a particle size of 10 mm and containing 30% titanium at 100°C or above to remove moisture, and placing them at the bottom of the ladle, and subjecting the molten steel to a composite modification treatment by a flushing method, so that the contents of all element components in the molten state after smelting are stabilized within the content range of the roller ring components described in Example 2 of Table 1 below, and the components are adjusted in front of the furnace and qualified before being discharged from the furnace;

[0085] S4. The reducing roller ring is formed by centrifugal casting. The speed n of the centrifuge during casting is determined by the following formula:

[0086]

[0087] Where G is the gravity coefficient, which ranges from 30 to 100; R is the inner radius of the casting thickness.

[0088] During specific implementation, in this embodiment, the mold rotation speed is selected to be 500-900 rpm according to the inner radius of the roller ring.

[0089] In this embodiment, the mold material is 20 cast steel or heat-resistant ductile iron, with a wall thickness of 80-150 mm, a preheating temperature of 200 ° C, and a layer of 2-5 mm coated sand is lined on the inner surface of the mold at this temperature. After the mold is dried, it is installed on a horizontal centrifuge to wait for pouring. During pouring, the mold temperature is 120 ° C, the molten steel pouring temperature is 1500 ° C, and the molten steel pouring speed is 6 Kg / s;

[0090] S5. After pouring, the inner surface is sprinkled with anti-oxidation O-type glass slag, and then the water spray cooling device above the water-cooled casting mold is turned on. 30 minutes after the molten steel pouring is completed, the roller ring is taken out from the casting mold and directly placed in an insulated box without electricity for high-temperature annealing. After more than 24 hours, it is hoisted out and placed in a slow cooling pit for slow cooling. The hardness of the roller ring after annealing is 30HRC, and rough processing is performed under this condition;

[0091] S6. After rough machining, the roller ring is subjected to high temperature quenching treatment. During quenching, the roller ring is heated to 1180°C with the furnace and kept warm for 5 hours, then quickly cooled to the martensitic transformation temperature by mist cooling, and then subjected to medium temperature tempering treatment (sufficient isothermal time), and the tempering treatment is repeated at least three times;

[0092] S7. Before finishing, the residual stress on the surface of the roller ring and the shallow surface residual austenite are tested to control the residual austenite to less than 5% before rolling on the machine;

[0093] S8. Finish machining to obtain roller rings with dimensional accuracy and surface finish that meet the requirements.

[0094] The performance of the roller ring manufactured in this embodiment is shown in Example 2 in Table 2 below.

[0095] Table 1: Roller ring composition

[0096]

[0097] Table 2: Roller ring performance

[0098]

[0099] Comparative Example 1

[0100] The chemical analysis of the samples taken from the roller ring showed the following composition (weight %):

[0101] 2.07% C, 5.20% W, 4.17% Mo, 2.66% V, 6.89% Cr, 0.62% A1, 0.64% Ni, 1.83% Co, 4.05% Nb, 0.17% Ti, 0.12% Ce, 0.11% Na, 0.012% Mg, 1.06% Si, 0.73% Mn, 0.011% S, 0.018% P, and the rest is Fe.

[0102] For other process parameters, see patent CN 1424423A.

[0103] In summary, the high-carbon, high-molybdenum, and high-vanadium finishing roller ring provided by the present invention has the advantages of high tensile strength, high hardness, moderate toughness, good red hardness and high wear resistance, and has a higher cost performance than the traditional tungsten carbide roller ring for wire or bar rolling mills.

[0104] The above are only preferred embodiments of the present invention, and only describe the implementation methods of the present invention. They do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high-speed wire rod finishing roller ring, characterized in that: Its chemical composition (wt%) is as follows: C：3.01～3.6； Si≦1.2; Mn≦0.60; P≦0.05； S≦0.05； Ni: 0.3~2.0; Cr：4.0～8.0； Mo: 8.01~8.5; V：10.01～11.0； Nb: 1.0~4.0; Al≦0.4； Ti: 0.05~0.20; Y：0.05～0.15； Ce: 0.05~0.15; B：0.05～0.10； The balance is Fe.

2. The method for preparing a high-speed wire rod finishing roller ring according to claim 1, characterized in that: include: S1. Mix ordinary scrap steel, high-speed steel scrap, pig iron, ferromolybdenum, ferrochrome, ferrovanadium and nickel plate according to the predetermined composition requirements and put them into a medium frequency electric furnace for melting; S2. When the temperature in front of the furnace rises to 1500-1700°C, ferroniobium particles are added to melt, and then 0.1-0.4% of the weight of the molten steel is added as an aluminum deoxidizer for alloying treatment; S3, after drying, cerium silicate, yttrium iron and titanium iron are placed at the bottom of the ladle, and the molten steel is subjected to composite modification by the flushing method, and the chemical composition in the molten state is stabilized within the set range, and the components are adjusted in front of the furnace and then discharged from the furnace; S4, forming the roller ring by centrifugal casting; S5. After pouring, an antioxidant is sprinkled on the inner surface, and then the water spray cooling device above the water-cooled mold is turned on. After the molten steel is poured for a set time, the roller ring is taken out of the mold and directly placed in an insulation box without electricity for high-temperature annealing treatment, and rough processing is performed after annealing; S6. After rough machining, the roller ring is subjected to high temperature quenching treatment. During quenching, the roller ring is heated to 1000-1180°C with the furnace and then kept warm for 2-6 hours. Then, it is quickly cooled to the martensite transformation temperature by mist cooling, and then subjected to medium temperature tempering treatment. S7. Before finishing, the residual stress on the roller ring surface and the shallow surface residual austenite are tested, and the residual austenite is controlled below 5% before rolling on the machine; S8. Finish machining to obtain roller rings with dimensional accuracy and surface finish that meet the requirements.

3. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S2, ferroniobium particles with a particle size of 2 mm are added.

4. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S3, cerium silica with a particle size of 10 mm and containing 30% cerium, yttrium iron with a particle size of 10 mm and containing 60% yttrium, and titanium iron with a particle size of 10 mm and containing 30% titanium are added.

5. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S4, the rotation speed n of the centrifuge during casting is determined according to the following formula: Where G is the gravity coefficient, which ranges from 30 to 100; R is the inner radius of the casting thickness.

6. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S4, the mold material is 20 cast steel or heat-resistant ductile iron, the wall thickness is 80-150 mm, the preheating temperature is 150-200 ° C, and at this temperature, a layer of 2-5 mm coated sand is lined on the inner surface of the mold. After the mold is dried, it is installed on a horizontal centrifuge to wait for pouring. During pouring, the mold temperature is 80-120 ° C, the molten steel pouring temperature is 1440-1500 ° C, and the molten steel pouring speed is 2-8 Kg / s.

7. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S5, after high temperature annealing treatment for more than 24 hours, the roller ring is hoisted out and placed in a slow cooling pit for slow cooling. The hardness of the roller ring after annealing is 25HRC to 35HRC.

8. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S5, the antioxidant includes but is not limited to O-type glass slag.

9. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S5, 20 to 30 minutes after the molten steel is poured, the roller ring is taken out from the mold.

10. The method for preparing a high-speed wire rod finishing roller ring according to claim 2, characterized in that: In step S6, the medium-temperature tempering treatment is repeated at least three times.

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