Special copper-tin alloy material and preparation method and application thereof

Abstract

The invention relates to a special copper-tin alloy material and a preparation method and application thereof. The special copper-tin alloy material comprises the following elements in percentage by mass: 6.0-10.0% of Sn; 0.05 to 0.5 part of Ni; zn: < = 5.0; mn < = 0.5; 0.2 to 1.0 part of Co; pb: < = 1.0; al < = 0.25; si < = 0.05; and the balance of copper and inevitable impurities. The tensile strength of the special copper-tin alloy material ranges from 360 MPa to 560 MPa, the yield strength ranges from 200 MPa to 350 MPa, the hardness ranges from 120 HB to 180 HB, the ductility is larger than or equal to 20%, and the special copper-tin alloy material further has the advantages of abrasion resistance, friction reduction, sintering resistance, corrosion resistance and good burying property and thermal conductivity.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to a special copper-tin alloy material and a preparation method and application thereof. Background Art

[0002] Ordinary tin bronze has relatively average strength and hardness, but when used with steel-backed bimetal or alloy steel sleeves, it can withstand heavy loads and resist wear. At the same time, it also has good toughness and ductility, can absorb shock and vibration to a certain extent, and has a wide range of applications.

[0003] Due to the low melting point of Sn, Sn is very likely to produce dendrite segregation during the production process of copper-tin alloy, forming a tin-rich phase, which significantly reduces the comprehensive performance of the copper-tin alloy. In order to ensure the uniformity of the cast structure of the copper-tin alloy, the existing copper-tin alloy production methods mainly use vacuum melting, rapid solidification, injection molding, powder metallurgy, or conventional methods for casting and then homogenizing.

[0004] The patent document with publication number CN108754222A and publication date November 6, 2018 discloses a tin bronze bushing, which is mainly cast from the following raw materials in weight percentage: Sn 8% to 10%, Pb 1% to 3%, Ni 0.5% to 1%, Zn 1% to 3%, Si 0.2% to 0.5%, and Cu balance. The tin bronze bushing adopts a metal mold casting method, has poor mechanical properties, and has a high friction coefficient. Summary of the invention

[0005] In order to obtain higher mechanical properties while having good wear resistance, sintering resistance and corrosion resistance, the present invention provides a special copper-tin alloy material and a preparation method and application thereof. The special copper-tin alloy material has a tensile strength of 360-560 MPa, a yield strength of 200-350 MPa, a hardness of 120-180 HB, an elongation of ≥20%, and has the advantages of wear resistance, friction reduction, sintering resistance, corrosion resistance, good embedding property and good thermal conductivity.

[0006] The technical solution provided by the present invention is specifically as follows:

[0007] In a first aspect, the present invention provides a special copper-tin alloy material, whose element composition, by mass percentage, is: Sn: 6.0-10.0; Ni: 0.05-0.5; Zn: ≤5.0; Mn≤0.5; Co: 0.2-1.0; Pb: ≤1.0; Al≤0.25; Si≤0.05; the rest is copper and unavoidable impurities.

[0008] In combination with the first aspect of the present invention, in some embodiments, the element composition of the special copper-tin alloy material is: Sn: 6.0-10.0; Ni: 0.2-0.5; Zn: 0.5-3.0; Mn: 0.2-0.5; Co: 0.3-0.6; Pb: 0.08-0.60; Al: 0.10-0.25; Si≤0.05; the rest is copper and unavoidable impurities.

[0009] In a second aspect, the present invention provides a method for preparing a special copper-tin alloy material, comprising:

[0010] Melting the alloy raw materials to obtain alloy liquid;

[0011] Performing vertical semi-continuous casting or horizontal continuous casting on the alloy liquid to obtain a cast alloy ingot or a first pipe;

[0012] hot extruding the cast alloy ingot to obtain a second tube;

[0013] The first pipe or the second pipe is subjected to low temperature rolling or low temperature forging after blanking to obtain a low temperature formed part;

[0014] The low-temperature formed parts are subjected to solution treatment, deep cryogenic treatment and tempering treatment in sequence to obtain a special copper-tin alloy material.

[0015] In conjunction with the second aspect of the present invention, in some embodiments, during the smelting:

[0016] A mechanical stirring device is provided on the top of the holding furnace or the intermediate transition bag, and the rotation speed is 30-100r / min.

[0017] In conjunction with the second aspect of the present invention, in some embodiments, in the vertical semi-continuous casting or horizontal continuous casting:

[0018] The outer periphery of the crystallizer used is provided with an electromagnetic induction device; and / or,

[0019] The frequency of electromagnetic stirring is 5 to 20 Hz; and / or,

[0020] The current of electromagnetic stirring is 80 to 160A; and / or,

[0021] The casting speed is 3 to 5 m / h.

[0022] In conjunction with the second aspect of the present invention, in some embodiments, the temperature of hot extrusion is 800-900° C.; and / or the speed of hot extrusion is 15-25 mm / s; and / or the extrusion ratio λ of hot extrusion is 10-40.

[0023] In conjunction with the second aspect of the present invention, in some embodiments, the temperature of low temperature rolling is 25-150° C.; and / or the deformation coefficient of low temperature rolling is 1.5-3.0.

[0024] In conjunction with the second aspect of the present invention, in some embodiments, the temperature of low temperature forging is 150-350°C.

[0025] In combination with the second aspect of the present invention, in some embodiments, the solution temperature is 600-850°C; and / or the solution time is 1-6 hours; and / or the cryogenic treatment temperature is -180--90°C; and / or the cryogenic treatment time is 1-6 hours; and / or the tempering temperature is 150-350°C; and / or the tempering time is 1-3 hours.

[0026] In a third aspect, the present invention provides an application of a special copper-tin alloy material in the preparation of high temperature resistant and wear resistant parts.

[0027] In combination with the third aspect of the present invention, in some embodiments, the high temperature resistant and wear resistant parts are disc parts or bushing parts.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] 1. The special copper-tin alloy material provided by the present invention has a tensile strength of 360-560 MPa, a yield strength of 200-350 MPa, a hardness of 120-180 HB, and an elongation of ≥20%. This performance is significantly improved compared with the prior art, and has the advantages of wear resistance, friction reduction, sintering resistance, corrosion resistance, good embedding and good thermal conductivity.

[0030] 2. The present invention uses mechanical stirring and electromagnetic stirring during the smelting process to improve the purity and uniformity of the alloy liquid, reduce the need for subsequent homogenization heat treatment procedures due to uneven composition, and reduce manufacturing costs and cycles. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are 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.

[0032] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range. Similarly, any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0033] It should be noted that, in the description of this article, unless otherwise specified, "above" and "below" include the number, and the meaning of "multiple" in "one or more" is two or more. Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0034] In the description of this specification, the description with reference to the terms "any embodiment / method", "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0035] The above summary of the invention of the present invention is not intended to describe each disclosed embodiment or each implementation in the present invention. The following description more specifically illustrates exemplary embodiments. These embodiments can be used in various combinations. In each example, the enumeration is only used as a representative group and should not be interpreted as exhaustive.

[0036] The term "embedding property" of the present invention refers to the property that the wear debris particles generated by wear can be easily pressed and embedded into the low-hardness matrix again, so as to prevent the particles from falling off the surface of the part and aggravating the abrasive wear and adhesive wear.

[0037] Special copper-tin alloy materials:

[0038] The invention provides a special copper-tin alloy material, which comprises the following elements by mass percentage: Sn: 6.0-10.0; Ni: 0.05-0.5; Zn: ≤5.0; Mn≤0.5; Co: 0.2-1.0; Pb: ≤1.0; Al≤0.25; Si≤0.05; and the rest are copper and unavoidable impurities.

[0039] The special copper-tin alloy material parts prepared by the invention have a tensile strength of 360-560 MPa, a yield strength of 200-350 MPa, a hardness of 120-180 HB, an elongation of ≥20%, an α-phase matrix structure, and have the advantages of wear resistance, friction reduction, sintering resistance, corrosion resistance, good embedding property and good thermal conductivity.

[0040] Furthermore, the element composition of the special copper-tin alloy material is: Sn: 6.0-10.0; Ni: 0.2-0.5; Zn: 0.5-3.0; Mn: 0.2-0.5; Co: 0.3-0.6; Pb: 0.08-0.60; Al: 0.10-0.25; Si≤0.05; the rest is copper and unavoidable impurities.

[0041] Furthermore, the element composition of the special copper-tin alloy material is: Sn: 6.0-10.0; Ni: 0.2-0.5; Zn: 1.0-2.5; Mn: 0.2-0.5; Co: 0.3-0.6; Pb: 0.08-0.60; Al: 0.10-0.25; Si≤0.05; the rest is copper and unavoidable impurities.

[0042] Preparation method:

[0043] The preparation method of the special copper-tin alloy material provided by the present invention comprises:

[0044] Melting the alloy raw materials to obtain alloy liquid;

[0045] Performing vertical semi-continuous casting or horizontal continuous casting on the alloy liquid to obtain a cast alloy ingot or a first pipe;

[0046] hot extruding the cast alloy ingot to obtain a second tube;

[0047] Performing low temperature forging or low temperature rolling on the first pipe or the second pipe to obtain a low temperature formed part;

[0048] The low-temperature formed parts are subjected to solution treatment, cryogenic treatment, tempering treatment and fine processing in sequence to obtain special copper-tin alloy parts.

[0049] The zinc, manganese, nickel, cobalt and lead added in the present invention can be dissolved in the copper-tin alloy α solid solution, and play the role of deoxidation and improving fluidity; nickel and cobalt dissolved in the α solid solution can reduce the solidification crystallization temperature range of the special copper-tin alloy material, reduce the shrinkage and reverse segregation of the special copper-tin alloy material, and further improve the uniformity of the organization. Through solid solution, deep cold treatment and tempering treatment, the above elements can be further dissolved in the α solid matrix to improve the comprehensive performance of the parts.

[0050] In some embodiments, a mechanical stirring device is provided on the top of a holding furnace or intermediate transition ladle used for smelting, and an electromagnetic induction device is provided on the periphery of a crystallizer used for vertical semi-continuous casting or horizontal continuous casting. The present invention introduces mechanical stirring and electromagnetic stirring processes in the casting process. Under the dual effects of electromagnetic stirring and mechanical stirring, the distribution of easily segregated Sn elements in the alloy liquid is improved, making it fully uniform, while refining the grains, obtaining high-quality cast alloy ingots or pipes, and achieving the elimination of the long-term homogenization heat treatment process required after conventional casting of such alloys, greatly shortening the preparation cycle.

[0051] In some embodiments, the rotation speed of the mechanical stirring device is 30-100r / min. In some embodiments, the frequency of electromagnetic stirring is 5-20Hz; the current of electromagnetic stirring is 80-160A; and the casting speed is 3-5m / h. The above parameters can ensure that the Sn element is evenly distributed in the cast alloy ingot or tube, thereby obtaining high-quality cast alloy ingots or tubes.

[0052] In some embodiments, the temperature of hot extrusion is 800-900° C.; and / or the speed of hot extrusion is 15-25 mm / s; and / or the extrusion ratio λ of hot extrusion is 10-40.

[0053] In some embodiments, the temperature of low temperature rolling is 25-150° C.; and / or the deformation coefficient of low temperature rolling is 1.5-3.0.

[0054] In some embodiments, the temperature of low temperature forging is 150-350°C.

[0055] In some embodiments, the solution temperature is 600-850°C; and / or the solution time is 1-6 hours; and / or the cryogenic treatment temperature is -180--90°C; and / or the cryogenic treatment time is 1-6 hours; and / or the tempering temperature is 150-350°C; and / or the tempering time is 1-3 hours.

[0056] application:

[0057] The present invention provides the use of the above-mentioned special copper-tin alloy material in the preparation of high-temperature resistant and wear-resistant parts, including the preparation of disc parts or bushing parts. These disc parts or bushing parts can be used in hydraulic pumps or engines.

[0058] Embodiment 1:

[0059] The preparation method of the special copper-tin alloy material provided in this embodiment comprises the following steps:

[0060] A. Melting: Heat and melt copper with a Cu purity of 99.9% to form a copper liquid, then slowly add other elements or alloys, and finally add tin. After the material is completely melted, heat it to 1275°C, then add tin bronze DCQT-X2 refining and slag removal agent according to 0.5wt% of the copper liquid, stir and remove the slag to obtain a liquid alloy;

[0061] B. Vertical semi-continuous casting: The liquid alloy is transferred to the intermediate transition bag and strongly stirred by the mechanical stirring motor at a speed of 40r / min; then vertical semi-continuous casting is performed. When the liquid alloy solidifies at the bottom of the crystallizer, the specially installed electromagnetic stirrer function is turned on, with an electromagnetic stirring frequency of 15Hz, an electromagnetic stirring current of 150A, and a casting speed of 4.6m / h to obtain a cast alloy ingot;

[0062] C. Hot extrusion: heat the cast alloy ingot to 850°C, extrusion speed 22mm / s, extrusion ratio 22.4, to obtain seamless extruded pipe;

[0063] D. Low temperature rolling: The seamless extruded tube is subjected to low temperature rolling treatment to obtain a low temperature rolled tube; rolling temperature: 25°C, rolling deformation: 1.65;

[0064] E. Solution treatment: The obtained low-temperature cold-rolled pipe is cut into a certain length, and the cut pipe is subjected to solution treatment. The solution treatment temperature is 720°C and the insulation time is 3 hours.

[0065] F. Cryogenic tempering treatment: The solid solution parts are cryogenically treated, then naturally cooled to room temperature, then tempered, and finally naturally cooled to room temperature; the cryogenic temperature is -120°C, the time is 2.5h; the tempering temperature is 170°C; the tempering time is 3h; a special copper-tin alloy material is obtained.

[0066] Embodiment 2:

[0067] The preparation method of the special copper-tin alloy material provided in this embodiment comprises the following steps:

[0068] A. Melting: heat and melt copper with a Cu purity of 99.9% to form a copper liquid, then slowly add other elements or alloys, and finally add tin. After the material is completely melted, heat it to 1265°C, then add tin bronze DCQT-X2 refining and slag removal agent according to 0.5wt% of the copper liquid, stir and remove the slag to obtain a liquid alloy;

[0069] B. Horizontal continuous casting: The liquid alloy is transferred to the intermediate transition package and stirred vigorously by the mechanical stirring motor at a speed of 40r / min. Horizontal continuous casting is performed. When the liquid alloy solidifies at the bottom of the crystallizer, the specially installed electromagnetic stirrer function is turned on. The electromagnetic stirring frequency is 15Hz, the electromagnetic stirring current is 150A, and the casting speed is 4.5m / h to obtain seamless pipes.

[0070] C. Low temperature rolling: The seamless pipe is subjected to low temperature rolling treatment to obtain low temperature rolled pipe; rolling temperature: 65°C, rolling deformation: 1.82;

[0071] D. Solution treatment: Cut the low-temperature rolled pipe into a certain length and perform solution treatment on the cut pipe. The solution treatment temperature is 680°C and the holding time is 4 hours.

[0072] E. Cryogenic tempering treatment: The solid solution parts are cryogenically treated, then naturally cooled to room temperature, then tempered, and finally naturally cooled to room temperature; the cryogenic temperature is -100°C, the time is 3h; the tempering temperature is 200°C; the tempering time is 2.5h, and a special copper-tin alloy material is obtained.

[0073] Embodiment 3:

[0074] The preparation method of the special copper-tin alloy material provided in this embodiment comprises the following steps:

[0075] A. Melting: Heat and melt copper with a Cu purity of 99.9% to form a copper liquid, then slowly add other elements or alloys; finally add tin, and after the material is completely melted, heat it to 1262°C, then add tin bronze DCQT-X2 refining and slag removal agent at 0.5wt% of the copper liquid, stir and remove the slag to obtain a liquid alloy;

[0076] B. Horizontal continuous casting: The liquid alloy is transferred to the intermediate transition package and stirred vigorously by the mechanical stirring motor at a speed of 40r / min. Horizontal continuous casting is performed. When the liquid alloy solidifies at the bottom of the crystallizer, the specially installed electromagnetic stirrer function is turned on. The electromagnetic stirring frequency is 15Hz, the electromagnetic stirring current is 150A, and the casting speed is 3.4m / h. Seamless pipes are obtained.

[0077] C. Low temperature forging: sawing the seamless pipe into sheet blanks, and low temperature forging the sheet blanks into solid disc castings. The low temperature forging temperature is 180℃.

[0078] D. Solution treatment: After solution treatment of the solid disc casting, it is naturally cooled to room temperature to obtain a solution casting; solution treatment temperature: 800°C; holding time: 1h.

[0079] E. Cryogenic and tempering treatment: The solid solution parts are cryogenically treated, then naturally cooled to room temperature, tempered again, and finally naturally cooled to room temperature; the cryogenic treatment temperature is -140°C, the time is 1.5h; the tempering temperature is 280°C, and the tempering time is 2h; a special copper-tin alloy material is obtained.

[0080] Embodiment 4:

[0081] The preparation method of the special copper-tin alloy material provided in this embodiment comprises the following steps:

[0082] A. Melting: Heat and melt copper with a Cu purity of 99.9% to form a copper liquid, then slowly add other elements or alloys; finally add tin, and after the material is completely melted, heat it to 1283°C, then add tin bronze DCQT-X2 refining and slag removal agent at 0.5wt% of the copper liquid, stir and remove the slag to obtain a liquid alloy;

[0083] B. Vertical semi-continuous casting: The liquid alloy is transferred to the intermediate transition bag and strongly stirred by the mechanical stirring motor at a speed of 40r / min. The vertical semi-continuous casting is performed. When the liquid alloy solidifies at the bottom of the crystallizer, the specially installed electromagnetic stirrer function is turned on. The electromagnetic stirring frequency is 15Hz, the electromagnetic stirring current is 150A, and the casting speed is 4.4m / h. The cast alloy ingot is obtained.

[0084] C. Hot extrusion: The cast alloy ingot is heated to 830°C for hot extrusion at a hot extrusion speed of 20 mm / s and an extrusion ratio of 23.6 to obtain a seamless extruded tube;

[0085] D. Low temperature forging: sawing the seamless extruded tube into sheet blanks, and low temperature forging the sheet blanks into solid disc castings, the low temperature forging temperature: 220℃;

[0086] E. Solution treatment: The solid disc casting is subjected to solution treatment at a temperature of 750°C and a holding time of 2.5 hours.

[0087] F. Cryogenic tempering treatment: The solid solution parts are cryogenically treated, then naturally cooled to room temperature, then tempered, and finally naturally cooled to room temperature; the cryogenic temperature is -160°C, the time is 1h; the tempering temperature is 300°C, and the tempering time is 1.5h; a special copper-tin alloy material is obtained.

[0088] The special copper-tin alloy material prepared in the above embodiment was subjected to a hardness test under the HRB test conditions of GB / T 230.1-2018, a mechanical property test was conducted under the GB / T 228B test conditions using the GB / T228.1-2010 test method, and a metallographic structure test was conducted according to GB / T 15749-2008 and YS / T 449-2002. A point contact cyclic reciprocating friction and wear tester and a rotary friction PV tester were used. The friction and wear test conditions were as follows: normal force: 200 N, ambient temperature: 150°C ± 2°C, oscillation frequency: 10 Hz, stroke length: 10 mm, lubrication: 80W-90GL4, test time: 33 min 20 s (sliding distance 400 m), and the wear scar depth of the sample was measured using a three-dimensional profiler. The specific test results are shown in Table 2:

[0089] Table 1 Element composition of special copper-tin alloy materials

[0090]

[0091] Table 2 Mechanical properties and wear resistance and sintering resistance of special copper-tin alloy materials

[0092]

[0093]

[0094] As shown in Table 2, the special copper-tin alloy material prepared by the present invention has a tensile strength greater than 460 MPa, a yield strength greater than 270 MPa, and an elongation ≥ 25%, indicating that the special copper-tin alloy material has high strength and high elongation; the friction coefficient is less than 0.14, and the wear depth is small, indicating that the special copper-tin alloy material is not only wear-resistant but also has less friction with the counterpart, and is very suitable for preparing wear-resistant parts; the PV value is greater than 17 MPa*m / s, and the high PV value of the material represents good sintering resistance, indicating that it can still maintain good mechanical sealing under high pressure and high speed conditions.

[0095] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A special copper-tin alloy material, characterized in that: In terms of mass percentage, the element composition is: Sn: 6.0-10.0; Ni: 0.05~0.5; Zn: ≤5.0; Mn ≤0.5; Co: 0.2~1.0; Pb: ≤1.0; Al ≤0.25; Si ≤0.05; the rest are copper and unavoidable impurities.

2. The special copper-tin alloy material according to claim 1, characterized in that: In terms of mass percentage, the element composition of the special copper-tin alloy material is as follows: Sn: 6.0-10.0; Ni: 0.2~0.5; Zn: 0.5~3.0; Mn: 0.2~0.5; Co: 0.3~0.6; Pb: 0.08~0.60; Al: 0.10~0.25; Si≤0.05; the rest is copper and unavoidable impurities.

3. A method for preparing a special copper-tin alloy material, characterized in that: include: Melting the alloy raw materials to obtain alloy liquid; Performing vertical semi-continuous casting or horizontal continuous casting on the alloy liquid to obtain a cast alloy ingot or a first pipe; hot extruding the cast alloy ingot to obtain a second tube; The first pipe or the second pipe is subjected to low temperature rolling or low temperature forging after blanking to obtain a low temperature formed part; The low-temperature formed parts are subjected to solution treatment, deep cryogenic treatment and tempering treatment in sequence to obtain a special copper-tin alloy material.

4. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: During the smelting: A mechanical stirring device is provided on the top of the holding furnace or the intermediate transition bag, and the rotation speed is 30-100r / min.

5. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: In the vertical semi-continuous casting or horizontal continuous casting: The outer periphery of the crystallizer used is provided with an electromagnetic induction device; and / or, The frequency of electromagnetic stirring is 5 to 20 Hz; and / or, The current of electromagnetic stirring is 80 to 160A; and / or, The casting speed is 3 to 5 m / h.

6. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: The temperature of hot extrusion is 800-900°C; and / or, The speed of hot extrusion is 15 to 25 mm / s; and / or, The extrusion ratio λ of hot extrusion is 10-40.

7. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: The temperature of low temperature rolling is 25-150°C; and / or, The deformation coefficient of low temperature rolling is 1.5 to 3.

0.

8. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: The temperature of low temperature forging is 150-350℃.

9. The method for preparing the special copper-tin alloy material according to claim 3, characterized in that: The solution temperature is 600 to 850°C; and / or, The solution time is 1 to 6 hours; and / or, The cryogenic treatment temperature is -180 to -90°C; and / or The cryogenic treatment time is 1 to 6 hours; and / or, The tempering temperature is 150 to 350°C; and / or, The tempering time is 1 to 3 hours.

10. Use of the special copper-tin alloy material according to claim 1 in the preparation of high temperature resistant and wear resistant parts.

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