A high-temperature fatigue-resistant copper alloy crystallization wheel, a preparation method thereof and application thereof

Abstract

The present application belongs to the technical field of copper alloy crystallizing wheel, and particularly relates to a high-temperature fatigue-resistant copper alloy crystallizing wheel and a preparation method thereof, which comprises the following steps: selecting CuCrZrIn material for the high-temperature fatigue-resistant copper alloy crystallizing wheel, melting the material, and performing vacuum electromagnetic centrifugal casting to obtain a ring-shaped crystallizing wheel casting blank; performing high-temperature multi-directional forging on the ring-shaped crystallizing wheel casting blank; performing first mechanical processing on the ring-shaped crystallizing wheel casting blank after high-temperature multi-directional forging to remove the surface oxidation layer and impurity components; and sequentially performing hot ring rolling, solid solution heat treatment, deep cold ring rolling, aging heat treatment and mechanical processing on the ring-shaped crystallizing wheel copper alloy casting blank to obtain the high-temperature fatigue-resistant copper alloy crystallizing wheel. The present application has the advantages of short and reasonable manufacturing process, high product component uniformity, high material yield, low cost, good high-temperature fatigue resistance, high product performance, long service life and the like.

Description

Technical Field

[0001] This invention belongs to the field of copper alloy crystallizing wheel technology, specifically relating to a high-temperature fatigue resistant copper alloy crystallizing wheel, its preparation method, and its application. Background Technology

[0002] The copper alloy crystallizer is one of the core components of a continuous casting and rolling production line, and is also one of the more expensive consumable parts, directly affecting product quality. During production, carbon powder, formed by acetylene, is sprayed onto the inner side of the crystallizer's groove. Molten copper or aluminum is poured into the carbon-powdered groove, and the crystallizer is cooled by an internal cooling water system. The crystallizer rotates at a uniform speed, allowing the molten copper or aluminum to complete the casting process, forming an inverted trapezoidal casting rake, which is then traction-driven into the rolling mill for rolling deformation.

[0003] Currently, the commonly used method for preparing copper alloy crystallizers is vacuum casting → hot forging → solution treatment → hot rolling → cold rolling → aging → machining. This process suffers from low yield, unstable performance, and high manufacturing costs. Furthermore, defects such as localized cracks and short service life occur during use, failing to fully meet the requirements of continuous casting and rolling production lines, especially those with large annual design capacity. Therefore, it is necessary to research a copper alloy crystallizer with low manufacturing cost, high temperature resistance, and long service life, as well as its preparation method. Summary of the Invention

[0004] In order to overcome the shortcomings of traditional processes in preparing copper alloy crystallizing wheels, such as low yield, high cost, and short service life, especially the shortcomings in high-temperature fatigue service, the present invention aims to provide an efficient preparation method for high-temperature fatigue resistant copper alloy crystallizing wheels with short process, high yield, and good high-temperature fatigue service performance.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel includes the following steps:

[0007] (1) Ingredients

[0008] CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 0.6~1.0wt%, Zr 0.1~0.15wt%, In 0.05~0.1wt%, Si 0.05~0.1wt%, Ni 0.1~0.2wt%, O≤10ppm, with the balance being Cu.

[0009] (2) Vacuum electromagnetic centrifugal casting

[0010] The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet.

[0011] (3) Initial machining

[0012] The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface.

[0013] (4) High-temperature multi-directional forging

[0014] The annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging.

[0015] (5) Hot ring rolling

[0016] The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet;

[0017] (6) Solution heat treatment

[0018] The crystallized ring blank obtained after hot ring rolling is subjected to solution heat treatment at a temperature of 900–950℃.

[0019] (7) Cryogenic ring rolling

[0020] The crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling;

[0021] (8) Aging heat treatment

[0022] The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 430–480℃ for a time of 2–6 hours.

[0023] (9) Secondary machining

[0024] The high-temperature fatigue-resistant copper alloy crystallizing wheel is produced by machining the crystallizing wheel ring blank after aging heat treatment into the finished product according to the product size requirements.

[0025] In a preferred example, in step (1), the element Cr is added in the form of CuCr20 master alloy, and the element Zr is added in the form of CuZr20 master alloy.

[0026] In a preferred example, in step (2), the vacuum degree during vacuum electromagnetic centrifugal casting is 5 to 50 Pa, the electromagnetic stirring frequency is 10 to 60 Hz, and the current is 100 to 300 A;

[0027] During centrifugal casting, the metal mold rotates at 100–200 rpm / min, the centrifugal mold is heated at 100–200℃, and the casting temperature is 1150–1250℃.

[0028] In a preferred example, in step (4), the initial forging temperature during high-temperature multi-directional forging is 900–950°C, the final forging temperature is 700–750°C, and the deformation per forging pass is 40–60%.

[0029] Multi-directional forging employs an axial-radial cycle, with 3 to 4 forging cycles.

[0030] In a preferred example, in step (5), a main roll with a platform is used during hot ring rolling. The longitudinal section of the main roll is trapezoidal. The boss of the main roll contacts the outer ring surface of the annular crystallizing wheel billet. The size of the boss of the main roll can be adjusted each time hot ring rolling. After hot ring rolling, a crystallizing wheel billet with grooves is obtained.

[0031] The heating temperature of the annular crystallizing wheel billet during hot ring rolling is 850-920℃, the number of hot ring rolling passes is 2-3, and the deformation per pass is 30-35%.

[0032] In a preferred example, in step (7), the main roll size of the last pass of hot ring rolling is used during cryogenic ring rolling; the cryogenic temperature is -200 to -100℃, the cryogenic ring rolling pass is a single pass, and the deformation is 25 to 30%.

[0033] In a preferred example, in step (9), the service temperature of the high-temperature fatigue-resistant copper alloy crystallizing wheel is 0 to 600°C, and the service life of the copper rod continuous casting and rolling production line with an annual output of ≥220,000 tons is ≥70,000 tons of product throughput.

[0034] Based on a general inventive concept, another object of the present invention is to provide a high-temperature fatigue-resistant copper alloy crystallizing wheel prepared by the above-described preparation method and its application in continuous casting and rolling production.

[0035] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0036] 1. Large ring copper alloy billets are prepared by vacuum electromagnetic centrifugal casting. Under vacuum conditions, the loss of Cr and Zr is extremely low, ensuring the stability and accuracy of Cr and Zr composition and greatly reducing losses. The copper alloy liquid solidifies under the action of electromagnetic stirring centrifugal casting, which reduces the generation of segregation in large ring castings, resulting in uniform composition and refined grains. At the same time, the slag in the casting process floats to the surface of the molten metal, which together improves the quality of the billet.

[0037] 2. The hot deformation processing method of high temperature multi-directional forging is adopted. The annular copper alloy casting is hot deformed by high temperature alternating large machining deformation in the axial and radial directions. The plastic deformation passes through the entire axial and radial areas of the casting, thereby ensuring the machinability of the casting billet.

[0038] 3. The deep cryogenic ring rolling deformation process solves the bottleneck of reduced softening strength of the workpiece during room temperature ring rolling, improves the strength of the crystallizing wheel, and lays a good foundation for extending the high temperature fatigue service life.

[0039] 4. The method is short, reasonable and efficient, and has the advantages of producing products with uniform composition, high yield, low cost, good high temperature fatigue resistance, high product performance and long service life. Attached Figure Description

[0040] Figure 1 This is a front view of a copper alloy crystallizing wheel structure according to one or more embodiments of the present invention;

[0041] Figure 2 This is a schematic diagram of the high-temperature multi-directional forging process according to one or more embodiments of the present invention;

[0042] Figure 3 This is a schematic diagram of cryogenic ring rolling according to one or more embodiments of the present invention;

[0043] In the above diagram: the spacing or dimensions between parts have been exaggerated to show the position of each part; the diagram is for illustrative purposes only. Figures 1-3 The markings in the middle have the following meanings: 1-Main roll; 2-Main roll boss; 3-Core roll; 4-Crystallizing wheel ring blank; 5-Conical roll; 6-Deep cooling device. Detailed Implementation

[0044] In the description of this invention, it is necessary to understand that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the indicated components must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is further described in conjunction with specific embodiments. However, this invention is not limited to these embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. In this invention, unless otherwise specified, all parts and percentages are units of mass, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0046] The terms “comprising,” “including,” “containing,” or any other variations thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0047] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including the ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0048] A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel includes the following steps:

[0049] (1) Ingredients

[0050] CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 0.6~1.0wt%, Zr 0.1~0.15wt%, In 0.05~0.1wt%, Si 0.05~0.1wt%, Ni 0.1~0.2wt%, O≤10ppm, with the balance being Cu.

[0051] In some implementations, the element Cr is added as a CuCr20 master alloy;

[0052] In some implementations, Zr is added as a CuZr20 master alloy;

[0053] (2) Vacuum electromagnetic centrifugal casting

[0054] The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet.

[0055] In some implementations, the vacuum level during vacuum electromagnetic centrifugal casting is 5–50 Pa;

[0056] In some embodiments, the electromagnetic stirring frequency is 10–60 Hz and the current is 100–300 A;

[0057] In some embodiments, the rotational speed of the metal mold during centrifugal casting is 100–200 rpm / min;

[0058] In some embodiments, the heating temperature of the centrifugal casting mold is 100–200°C;

[0059] In some embodiments, the casting temperature is 1150–1250°C;

[0060] (3) Initial machining

[0061] The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface.

[0062] (4) High-temperature multi-directional forging

[0063] The annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging.

[0064] In some embodiments, the initial forging temperature during high-temperature multi-directional forging is 900–950°C;

[0065] In some embodiments, the final forging temperature is 700–750°C;

[0066] In some implementations, the deformation per forging pass is 40-60%;

[0067] In some implementations, multi-directional forging employs an axial-radial cycle, with 3 to 4 forging cycles.

[0068] (5) Hot ring rolling

[0069] The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet;

[0070] In some embodiments, a main roll with a platform is used during hot ring rolling. The longitudinal section of the main roll is trapezoidal. The boss of the main roll contacts the outer ring surface of the annular crystallizer billet. The size of the boss of the main roll can be adjusted each time the hot ring rolling is performed. After hot ring rolling, a crystallizer billet with grooves is obtained.

[0071] In some embodiments, the heating temperature of the crystallizing wheel annular billet during hot ring rolling is 850–920°C;

[0072] In some implementations, the hot ring rolling passes are 2 to 3;

[0073] In some implementations, the deformation per pass is 30-35%;

[0074] (6) Solution heat treatment

[0075] The crystallized ring blank obtained after hot ring rolling is subjected to solution heat treatment at a temperature of 900–950℃.

[0076] (7) Cryogenic ring rolling

[0077] The crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling;

[0078] In some implementations, the roll size of the final pass of hot ring rolling is used during cryogenic ring rolling;

[0079] In some implementations, the cryogenic temperature is -200 to -100°C;

[0080] In some implementations, the cryogenic ring rolling pass is a single pass, with a deformation amount of 25-30%;

[0081] (8) Aging heat treatment

[0082] The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 430–480℃ for a time of 2–6 hours.

[0083] (9) Secondary machining

[0084] The high-temperature fatigue-resistant copper alloy crystallizing wheel is produced by machining the crystallizing wheel ring blank after aging heat treatment into the finished product according to the product size requirements.

[0085] The specific embodiments of the present invention will be described in detail below.

[0086] Example 1

[0087] A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel includes the following steps:

[0088] (1) Ingredients

[0089] The CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 0.6wt%, Zr 0.13wt%, In 0.05wt%, Si 0.08wt%, Ni 0.15wt%, O≤10ppm, with the balance being Cu.

[0090] Among them, the Cr element is added in the form of CuCr20 master alloy, and the Zr element is added in the form of CuZr20 master alloy.

[0091] (2) Vacuum electromagnetic centrifugal casting

[0092] The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet.

[0093] The vacuum degree during vacuum electromagnetic centrifugal casting is 20Pa, the electromagnetic stirring frequency is 60HZ, and the current is 200A.

[0094] During centrifugal casting, the metal mold rotates at 100 rpm / min, the centrifugal mold is heated at 200℃, and the casting temperature is 1200℃.

[0095] (3) Initial machining

[0096] The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface.

[0097] (4) High-temperature multi-directional forging

[0098] like Figure 2 As shown, the annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging;

[0099] The initial forging temperature for high-temperature multi-directional forging is 920℃, the final forging temperature is 700℃, and the deformation per forging pass is 50%.

[0100] Multi-directional forging employs an axial-radial cycle, with a forging cycle of 3 times.

[0101] (5) Hot ring rolling

[0102] The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet;

[0103] During hot ring rolling, a main roll with a platform is used. The longitudinal section of the main roll is trapezoidal. The main roll boss contacts the outer ring surface of the annular crystallizer billet. The size of the main roll boss can be adjusted each time the hot ring rolling is performed. After hot ring rolling, a crystallizer billet with grooves is obtained.

[0104] The heating temperature of the annular crystallizing wheel billet during hot ring rolling is 900℃, the hot ring rolling is performed in 2 passes, and the deformation per pass is 30%.

[0105] (6) Solution heat treatment

[0106] The crystallized ring blank obtained after hot rolling is subjected to solution heat treatment at a temperature of 920℃.

[0107] (7) Cryogenic ring rolling

[0108] like Figure 3 As shown, the crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling;

[0109] The main roll dimensions of the last pass of hot ring rolling are adopted during cryogenic ring rolling; the cryogenic temperature is -100℃, the cryogenic ring rolling is a single pass, and the deformation is 25%;

[0110] (8) Aging heat treatment

[0111] The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 450℃ for 6 hours.

[0112] (9) Secondary machining

[0113] The age-heat-treated crystallizing ring blank is processed to the required product dimensions as shown below. Figure 1 The finished product shown is a high-temperature fatigue-resistant copper alloy crystallizing wheel. The service temperature of the high-temperature fatigue-resistant copper alloy crystallizing wheel is 0~600℃. The copper rod continuous casting and rolling production line with an annual output of ≥220,000 tons has a service life of ≥70,000 tons of product throughput.

[0114] Example 2

[0115] A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel includes the following steps:

[0116] (1) Ingredients

[0117] The CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 1.0wt%, Zr 0.1wt%, In 0.1wt%, Si 0.05wt%, Ni 0.18wt%, O≤10ppm, with the balance being Cu.

[0118] Among them, the Cr element is added in the form of CuCr20 master alloy, and the Zr element is added in the form of CuZr20 master alloy.

[0119] (2) Vacuum electromagnetic centrifugal casting

[0120] The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet.

[0121] The vacuum degree during vacuum electromagnetic centrifugal casting is 35Pa, the electromagnetic stirring frequency is 25HZ, and the current is 250A.

[0122] During centrifugal casting, the metal mold rotates at 200 rpm / min, the centrifugal mold is heated at 120℃, and the casting temperature is 1150℃.

[0123] (3) Initial machining

[0124] The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface.

[0125] (4) High-temperature multi-directional forging

[0126] like Figure 2 As shown, the annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging;

[0127] The initial forging temperature for high-temperature multi-directional forging is 945℃, the final forging temperature is 730℃, and the deformation per forging pass is 40%.

[0128] Multi-directional forging employs an axial-radial cycle, with a forging cycle of 4 times.

[0129] (5) Hot ring rolling

[0130] The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet;

[0131] During hot ring rolling, a main roll with a platform is used. The longitudinal section of the main roll is trapezoidal. The main roll boss contacts the outer ring surface of the annular crystallizer billet. The size of the main roll boss can be adjusted each time the hot ring rolling is performed. After hot ring rolling, a crystallizer billet with grooves is obtained.

[0132] The heating temperature of the annular crystallizing wheel billet during hot ring rolling is 850℃, the hot ring rolling is performed in 3 passes, and the deformation per pass is 32%.

[0133] (6) Solution heat treatment

[0134] The crystallized ring blank obtained after hot ring rolling is subjected to solution heat treatment at a temperature of 900–950℃.

[0135] (7) Cryogenic ring rolling

[0136] like Figure 3 As shown, the crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling;

[0137] The main roll dimensions of the last pass of hot ring rolling are adopted during cryogenic ring rolling; the cryogenic temperature is -150℃, the cryogenic ring rolling is a single pass, and the deformation is 29%;

[0138] (8) Aging heat treatment

[0139] The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 480℃ for 2 hours.

[0140] (9) Secondary machining

[0141] The age-heat-treated crystallizing ring blank is processed to the required product dimensions as shown below. Figure 1 The finished product shown is a high-temperature fatigue-resistant copper alloy crystallizing wheel. The service temperature of the high-temperature fatigue-resistant copper alloy crystallizing wheel is 0~600℃. The copper rod continuous casting and rolling production line with an annual output of ≥220,000 tons has a service life of ≥70,000 tons of product throughput.

[0142] Example 3

[0143] A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel includes the following steps:

[0144] (1) Ingredients

[0145] The CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 0.8wt%, Zr 0.11wt%, In 0.07wt%, Si 0.06wt%, Ni 0.11wt%, O≤10ppm, with the balance being Cu.

[0146] Among them, the Cr element is added in the form of CuCr20 master alloy, and the Zr element is added in the form of CuZr20 master alloy.

[0147] (2) Vacuum electromagnetic centrifugal casting

[0148] The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet.

[0149] The vacuum degree during vacuum electromagnetic centrifugal casting is 10 Pa, the electromagnetic stirring frequency is 45 Hz, and the current is 100 A.

[0150] During centrifugal casting, the metal mold rotates at 150 rpm / min, the centrifugal mold is heated at 160℃, and the casting temperature is 1250℃.

[0151] (3) Initial machining

[0152] The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface.

[0153] (4) High-temperature multi-directional forging

[0154] like Figure 2 As shown, the annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging;

[0155] The initial forging temperature for high-temperature multi-directional forging is 905℃, the final forging temperature is 700℃, and the deformation per forging pass is 60%.

[0156] Multi-directional forging employs an axial-radial cycle, with a forging cycle of 4 times.

[0157] (5) Hot ring rolling

[0158] The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet;

[0159] During hot ring rolling, a main roll with a platform is used. The longitudinal section of the main roll is trapezoidal. The main roll boss contacts the outer ring surface of the annular crystallizer billet. The size of the main roll boss can be adjusted each time the hot ring rolling is performed. After hot ring rolling, a crystallizer billet with grooves is obtained.

[0160] The heating temperature of the annular crystallizing wheel billet during hot ring rolling is 920℃, the hot ring rolling is performed in 2 passes, and the deformation per pass is 35%.

[0161] (6) Solution heat treatment

[0162] The crystallized ring blank obtained after hot ring rolling is subjected to solution heat treatment at a temperature of 900–950℃.

[0163] (7) Cryogenic ring rolling

[0164] like Figure 3 As shown, the crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling;

[0165] The main roll dimensions of the last pass of hot ring rolling are adopted for cryogenic ring rolling; the cryogenic temperature is -200°C, the cryogenic ring rolling is a single pass, and the deformation is 27%;

[0166] The crystallizing wheel billet obtained after hot ring rolling is subjected to cryogenic ring rolling. The roll size of the last pass of hot ring rolling is used in cryogenic ring rolling. The cryogenic temperature is -100℃. The cryogenic ring rolling is a single pass with a deformation of 25%.

[0167] (8) Aging heat treatment

[0168] The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 430℃ for 4 hours.

[0169] (9) Secondary machining

[0170] The age-heat-treated crystallizing ring blank is processed to the required product dimensions as shown below. Figure 1 The finished product shown is a high-temperature fatigue-resistant copper alloy crystallizing wheel. The service temperature of the high-temperature fatigue-resistant copper alloy crystallizing wheel is 0~600℃. The copper rod continuous casting and rolling production line with an annual output of ≥220,000 tons has a service life of ≥70,000 tons of product throughput.

[0171] The above embodiments are merely preferred embodiments of the present invention. Any simple modifications, alterations, and substitutions made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel, characterized in that, Includes the following steps: (1) Ingredients CuCrZrIn material was selected and prepared according to the following elemental composition: Cr 0.6~1.0wt%, Zr 0.1~0.15wt%, In 0.05~0.1wt%, Si 0.05~0.1wt%, Ni 0.1~0.2wt%, O≤10ppm, with the balance being Cu. (2) Vacuum electromagnetic centrifugal casting The various metal materials are melted and vacuum electromagnetic centrifugal casting is performed to obtain an annular crystallizing wheel billet. The vacuum degree during vacuum electromagnetic centrifugal casting is 5-50 Pa, the electromagnetic stirring frequency is 10-60 Hz, and the current is 100-300 A. During centrifugal casting, the rotation speed of the metal mold is 100-200 rpm / min, the heating temperature of the centrifugal casting mold is 100-200℃, and the casting temperature is 1150-1250℃. (3) Initial machining The annular crystallizing wheel billet obtained by vacuum electromagnetic centrifugal casting is machined to remove the oxide layer and impurities from the surface. (4) High-temperature multi-directional forging The annular crystallizing wheel billet obtained after machining is used as the blank material for high-temperature multi-directional forging. During high-temperature multi-directional forging, the initial forging temperature is 900–950℃, the final forging temperature is 700–750℃, and the deformation per forging pass is 40–60%. Multi-directional forging employs an axial-radial cycle, with 3 to 4 forging cycles. (5) Hot ring rolling The annular crystallizing wheel billet obtained after high-temperature multi-directional forging is used as the hot ring rolling billet to obtain the crystallizing wheel ring billet; (6) Solution heat treatment The crystallized ring blank obtained after hot ring rolling is subjected to solution heat treatment at a temperature of 900–950℃. (7) Cryogenic ring rolling The crystallized ring blank obtained after solution heat treatment is subjected to cryogenic ring rolling; The main roll dimensions of the last pass of hot ring rolling are adopted for cryogenic ring rolling; the cryogenic temperature is -200 to -100℃, the cryogenic ring rolling is a single pass, and the deformation is 25% to 30%; (8) Aging heat treatment The crystallized ring blank after cryogenic annular rolling is subjected to aging heat treatment at a temperature of 430–480℃ for a time of 2–6 hours. (9) Secondary machining The high-temperature fatigue-resistant copper alloy crystallizing wheel is produced by machining the crystallizing wheel ring blank after aging heat treatment into the finished product according to the product size requirements.

2. The method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel according to claim 1, characterized in that, In step (1), the Cr element is added in the form of CuCr20 master alloy, and the Zr element is added in the form of CuZr20 master alloy.

3. The method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel according to claim 1, characterized in that, In step (5), a main roll with a platform is used during hot ring rolling. The longitudinal section of the main roll is trapezoidal. The boss of the main roll contacts the outer ring surface of the annular crystallizing wheel billet. The size of the boss of the main roll can be adjusted each time hot ring rolling. After hot ring rolling, a crystallizing wheel billet with grooves is obtained. The heating temperature of the annular crystallizing wheel billet during hot ring rolling is 850-920℃, the number of hot ring rolling passes is 2-3, and the deformation per pass is 30-35%.

4. The method for preparing a high-temperature fatigue-resistant copper alloy crystallizing wheel according to claim 1, characterized in that, In step (9), the service temperature of the high-temperature fatigue-resistant copper alloy crystallizing wheel is 0 to 600°C, and the service life of the copper rod continuous casting and rolling production line with an annual output of ≥220,000 tons is ≥70,000 tons of product throughput.

5. A high-temperature fatigue-resistant copper alloy crystallizing wheel prepared by the preparation method according to any one of claims 1 to 4.

6. The application of the high-temperature fatigue-resistant copper alloy crystallizing wheel as described in claim 5 in continuous casting and rolling production.

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