Process production method of tin-phosphor bronze alloy

Abstract

The invention discloses a process production method of a tin-phosphor bronze alloy, which is characterized in that the tin-phosphor bronze alloy comprises the following components in percentage by mass: 0.6-0.7% of Sn; the copper alloy comprises the following components in percentage by weight: 0.10-0.25% of P, 0.05-0.10% of Te, less than or equal to 0.10% of other impurity elements and the balance of According to the method, the rod material with the diameter phi of 12.5 mm is produced through 2000 kg horizontal continuous casting. The process route comprises the steps of rod material continuous casting, cold rolling, softening annealing, reverse drawing and peeling, reverse drawing and peeling, softening annealing, reverse drawing and peeling, reverse drawing, softening annealing and reverse drawing of a finished product. According to the process route, the organization structure of the material is converted into a compact cold drawing organization from a coarse as-cast organization. And due to the increase of the tellurium element, the machinability of the material is improved by 15%, and the tin-phosphor bronze material obtained through the process route is compact in structure, fine in grain, high in strength and excellent in comprehensive performance. The tensile strength Rm of the tin-phosphor bronze material is larger than or equal to 800 MPa, the ductility A is larger than or equal to 3%, the machinability is 80% or above, and the electric conductivity is larger than or equal to 14% IACS.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of copper alloy, and particularly relates to a process production method of tin-phosphor bronze alloy. BACKGROUND

[0002] Tin-phosphor bronze has high strength, wear resistance, corrosion resistance, good welding performance and chemical performance, high wear resistance, non-magnetic, and is a good elastic material, which is widely used in industry and has large market demand. Tin bronze has the above excellent performance due to the addition of tin element. Currently, commonly used tin bronze mainly includes Cu-Sn-P and Cu-Sn-Zn-P, and the tin-phosphor bronze in the Cu-Sn-P series significantly improves the strength, hardness and elasticity of the material through the solid solution strengthening effect of Sn element and the formation of Cu3P phase. However, for tin-phosphor bronze produced by continuous casting rod, the grain is coarse, and there are defects such as cold shut and oxidation on the surface. In the subsequent processing process, the surface is easy to crack, the surface defects are embedded into the material, and the defects in the material affect the performance and quality of the material.

[0003] The application regulates the process of the production process of tin-phosphor bronze to obtain a process production method of tin-phosphor bronze with dense organization, high strength and good quality. SUMMARY

[0004] The purpose of the application is to solve the above technical problems, and provide a process production method of tin-phosphor bronze alloy: continuous casting rod material-cold rolling-softening annealing-inverted drawing+peeling-inverted drawing+peeling-softening annealing-inverted drawing+peeling-inverted drawing-softening annealing-inverted drawing-annealing-inverted drawing finished product. The material obtained by the production method has dense organization, small grain size, high strength and excellent comprehensive performance of tin-phosphor bronze material. The tensile strength Rm of the tin-phosphor bronze material is greater than or equal to 800 MPa, the elongation A is greater than or equal to 3%, the cutting property is greater than 80%, and the electrical conductivity is greater than or equal to 14% IACS.

[0005] In order to achieve the above purpose, the technical scheme adopted by the application is as follows: A production method of tin-phosphor bronze alloy, comprising the following steps: (1) Melting: material preparation is performed according to the required composition.

[0006] (2) Casting: a horizontal continuous casting method is used to produce a continuous casting rod material with a specification of φ12.5 mm, the pulling speed is 0.2-0.4 mm / min, the pulling pitch is 4-5 mm, the reverse pushing length is 0.4-0.6 mm, the duty cycle is 20%, the cooling water pressure is 0.6-0.8 MPa, and the casting temperature is controlled at 1170-1190℃.

[0007] (3) Performance testing of continuous casting rod material: tensile strength range is 300MPa~35MPa, and elongation range is 25%~35%.

[0008] (4) Cold rolling: The continuous casting rod is cold rolled to φ10mm using a rolling mill to obtain the primary billet. The billet is oval in shape.

[0009] (5) Softening annealing: The obtained billet is subjected to homogenization annealing, the annealing temperature range is: 500℃~600℃, and the holding time is: 3h~4h.

[0010] (6) Drawing and reducing process: After each annealing pass, the annealed blank is subjected to a drawing and peeling process with a deformation of 15% to 25%. The total deformation is 50% to 70%.

[0011] (7) Peeling process: After the material is annealed, it is drawn at 15% to 25%, and then peeled at a reduction of 0.15 mm (15 wire). In the peeling process, a continuous process of drawing + peeling is adopted, and the difference between the drawn size and the peeling size is 0.15 mm.

[0012] (8) Finished product drawing: After the pre-finished billet is softened and annealed, the finished product is drawn. The finished product is stretched in 2 to 3 passes. The stretching deformation of each pass is about 20%, and the total stretching deformation is 50% to 70%.

[0013] Due to the application of the above technical solution, the present invention provides a tin-phosphorus bronze alloy having the following advantages: The present invention provides a method for producing a tin-phosphorus bronze alloy. The resulting material exhibits excellent overall properties, including dense microstructure, fine grains, and high strength. The material exhibits a tensile strength (Rm) of 800 MPa or greater, an elongation (A) of 3% or greater, machinability of 80% or greater, and electrical conductivity of 14% IACS or greater. Specific implementation methods

[0014] In order to make the purpose, technical solution and key points of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments. It is necessary to point out that the following embodiments are merely intended to explain and illustrate the present invention and are not intended to limit the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above invention content still fall within the scope of protection of the present invention.

[0015] A method for producing a tin-phosphor bronze alloy comprises the following steps: (1) Melting preparation: Prepare the proportions according to the required ingredients and weigh the corresponding materials.

[0016] (2) Casting of the continuous casting rod: a 2000kg horizontal continuous casting method is used to produce a φ12.5mm continuous casting rod material, the pulling speed is 0.2~0.4mm / min, the pulling pitch is 4mm~5mm, the reverse pushing length is 0.4mm~0.6mm, the duty cycle is 20%, the cooling water pressure is 0.6~0.8MPa, and the casting temperature is controlled at 1170℃~1190℃.

[0017] (3) Cold rolling: the obtained continuous casting rod material is cold rolled to φ10mm using a rolling mill to obtain a primary blank. The blank is elliptical.

[0018] (4) Softening annealing: the obtained blank is subjected to homogenizing annealing, the annealing temperature range is 500℃~600℃, and the holding time is 3h~4h.

[0019] (5) First diameter reduction: φ10(R state) - reverse drawing φ9.15 - stripping φ9.0 - reverse drawing φ8.15 - stripping φ8.0 - reverse drawing φ7.15 - stripping φ7.0 - softening annealing.

[0020] (6) Softening annealing: the obtained blank is subjected to homogenizing annealing, the annealing temperature range is 500℃~600℃, and the holding time is 3h~4h.

[0021] (7) Second diameter reduction: φ7.0(R state) - reverse drawing φ6.1 - reverse drawing φ5.5 - φ5.0 softening annealing.

[0022] (8) φ5.0(R state) - reverse drawing φ4.3 - reverse drawing φ3.8 - reverse drawing φ3.5, to obtain a φ3.5 finished ring wire.

[0023] The above ring wire product is subjected to performance testing: the tensile strength of the tin-phosphor bronze material produced by the process is Rm: 900MPa, the elongation is A: 4%, the electrical conductivity is 14%IACS, and the machinability is 82%.

[0024] The above is only a specific application example of the present application, and does not constitute any limitation on the protection scope of the present application. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the present application.

Claims

1. A process for producing tin-phosphorus bronze alloy, characterized in that: The tin-phosphorus bronze alloy comprises, by mass percentage, Sn: 0.6%-0.7%; P: 0.10%-0.25%, Te: 0.05%-0.10%, other impurity elements: ≤0.10%, and the remainder being Cu. A 12.5 mm diameter rod is produced using 2000 kg of horizontal continuous casting, and the process route comprises: continuous casting of the rod, cold rolling, softening annealing, backdrawing and peeling, backdrawing and peeling, soft annealing, backdrawing and peeling, backdrawing, annealing, and backdrawing to produce the finished product. The material is transformed from a coarse as-cast structure to a dense cold-drawn structure. Furthermore, the addition of tellurium improves the material's machinability by 15%. The tin-phosphorus bronze material obtained through this process has excellent comprehensive properties, such as a dense structure, fine grains, and high strength. The tin-phosphorus bronze material has a tensile strength Rm ≥ 800 MPa, an elongation A ≥ 3%, a machinability of over 80%, and a conductivity ≥ 14% IACS.

2. The method for producing a tin-phosphorus bronze alloy according to claim 1, wherein: The production steps include: 1) Melting: Mix according to the required ingredients; 2) Casting: Horizontal continuous casting is used to produce φ12.5mm continuous casting rods; The pulling speed is 0.2~0.4mm / min, the pulling pitch is 4mm~5mm, the reverse thrust length is 0.4mm~0.6mm, the duty cycle is 20%, the cooling water pressure is 0.6~0.8MPa, and the casting temperature is controlled at 1170℃~1190℃; 3) Properties of continuous casting rods: tensile strength ranges from 300MPa to 35MPa, and elongation ranges from 25% to 35%; 4) Cold rolling: The obtained continuous casting rod is cold rolled to φ10mm using a rolling mill to obtain the primary billet; the billet is oval in shape; 5) Softening annealing: homogenize the obtained billet, the annealing temperature range is: 500℃~600℃, and the holding time is: 3h~4h; 6) Drawing and reducing process: After each annealing pass, the annealed billet is subjected to a drawing and peeling process with a deformation of 20% to 30%; the total deformation is 50% to 70%; 7) Peeling process: After the material is annealed, it is drawn at 20%~25%, and then peeled according to the size reduction of 0.15mm. In the peeling process, the continuous process of drawing + peeling is adopted, and the difference between the drawn size and the peeling size is 0.15mm. 8) Finished product drawing: After the pre-finished billet is softened and annealed, the finished product is drawn. The finished product is stretched in 2 to 3 passes. The stretching deformation of each pass is about 20%, and the total stretching deformation is 50% to 70%.

3. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In the step 2), the horizontal continuous casting obtains rods with a diameter of 12.5 mm.

4. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In step 3), the tensile strength Rm of the rod material is in the range of 300 MPa to 350 MPa.

5. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In step 3), the elongation A of the rod material ranges from 25% to 35%.

6. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In the step 4), the cold rolling is performed to a specification of φ10 mm.

7. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In the step 5), the temperature of the softening annealing is 500° C. to 600° C.

8. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In the step 5), the softening annealing time is 3 h to 4 h.

9. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In step 6), the deformation amount of each pass is 20% to 25%.

10. The method for producing tin-phosphorus bronze alloy according to claim 2, characterized in that: In step 6), the total deformation amount per pass is 50% to 70%.

11. The method for producing tin-phosphorus bronze alloy according to claim 2, characterized in that: In step 7), the difference between drawing and peeling is 0.15 mm.

12. The method for producing tin-phosphorus bronze alloy according to claim 2, wherein: In step 8), the finished product is drawn 2 to 3 times.

13. The method for producing tin-phosphorus bronze alloy according to claim 2, characterized in that: In step 8), the deformation of the finished product in each drawing pass is 20% to 30%.

14. The method for producing tin-phosphorus bronze alloy according to claim 2, characterized in that: In step 8), the total deformation of the finished product during drawing is 50% to 70%.