High copper alloy bar and method of processing

Abstract

A high copper alloy rod and a processing method, the alloy composition of the high copper alloy rod is: Ni: 0.3-1.5%; Cr: 0.2-0.6%; Ce: 0.003-0.05%; impurities: ≤0.3%; the balance is Cu; the sum of the above components is 100%; specification φ10-40mm; the process flow is: smelting-casting-extrusion-online quenching-drawing-finished product drawing-finished product aging-packaging into warehouse; the alloy performance is improved through deformation heat treatment, the various requirements of use are reached, the comprehensive performance such as high thermal conductivity, high strength and the like of the parts working under high temperature environment is met, the use requirements of the parts in the material aspect are ensured, and the application can also be popularized in other copper-based alloy material use fields needing to meet high strength, high thermal conductivity and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal processing, and more particularly to a high-copper alloy bar and a processing method thereof. Background Technology

[0002] Currently, widely used high-conductivity, high-temperature copper alloys such as Cu-Cr, Cu-Zr, and Cu-Cr-Zr are mainly used in electrical equipment and other fields. However, components operating in high-temperature environments require high electrical conductivity, good thermal conductivity, and the ability to withstand harsh conditions such as high temperature and pressure, and high flow rate impact. Simultaneously, the material must possess a certain degree of corrosion resistance. Copper-chromium-zirconium alloys cannot adequately meet these requirements.

[0003] For the reasons mentioned above, a high-copper alloy rod and its processing method have been developed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-copper alloy rod and its processing method. Through deformation heat treatment, the alloy properties are improved to meet various application requirements, satisfying the comprehensive performance requirements of high thermal conductivity and high strength for components operating in high-temperature environments. This ensures the material performance of the components and can also be applied to other copper-based alloy materials requiring high strength, high thermal conductivity, and corrosion resistance. The product performance of this invention is: Rm: 305MPa, Rp0.2: 187MPa, A: 33.5%, conductivity: 81.33% IACS. It meets customer requirements and shows a significant improvement in performance compared to copper-chromium-zirconium alloys. Copper-chromium-zirconium alloy performance is: Rm: 230-285MPa, Rp0.2: 86-160MPa, A: 29.0-40.0%, conductivity: 78.0-83.0% IACS.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-copper alloy rod, wherein the alloy composition of the high-copper alloy rod is: Ni: 0.3-1.5%; Cr: 0.2-0.6%; Ce: 0.003-0.05%; impurities: ≤0.3%; balance Cu; the sum of the above components is 100%; and the specification is φ10-40mm.

[0006] A method for processing high-copper alloy bars, the process flow is as follows: melting and casting - extrusion - online quenching - stretching - finished product stretching - finished product aging - packaging and warehousing;

[0007] Melting and casting: Melting and casting is carried out using a medium-frequency vacuum induction furnace. The furnace temperature is 1150-1350℃, the casting time is 4.0-6.0min, and the casting is done in ingots with a diameter of φ70-245mm.

[0008] Extrusion: Extrusion is carried out using an extruder, with a heating temperature of 900-980℃, an extrusion speed of 15-35mm / s, and a residual thickness of 30-60mm, to produce bar billets with a diameter of φ20-120mm;

[0009] Online quenching: Quenching is performed by directly immersing the extruded rod into the water bath online. The quenching water temperature is 900-960℃.

[0010] Stretching: A hydraulic stretching machine is used for stretching, with a processing rate of 25-65%.

[0011] Finished product stretching: Stretching is performed using a hydraulic stretching machine, with a finished product yield of 25-65%.

[0012] Finished product aging: Finished product aging is carried out using a car bottom quenching furnace, aging temperature: 420-550℃, holding time: 180-360min;

[0013] Packaging and warehousing: Finished products are inspected, and those that pass the inspection are packaged and put into storage.

[0014] The beneficial effects of this invention are: nickel is dissolved in copper, and Cu and Ni form a continuous solid solution with a face-centered cubic lattice, which improves strength, repeated bending resistance, rigidity and softening resistance;

[0015] The maximum solid solubility of chromium in copper is 0.65%wt. As the temperature decreases, the solid solubility of chromium in copper decreases sharply. Through the quenching-aging process, the precipitated Cr particles have a precipitation strengthening effect on the matrix.

[0016] Cerium (Ce) is a rare earth metal with very low solid solubility. It can refine grains and improve the strength and hardness of materials.

[0017] This invention employs convenient processing and heat treatment methods, significantly improving material performance and production efficiency. Through deformation heat treatment, alloy properties are enhanced to meet various usage requirements, satisfying the comprehensive performance requirements of high thermal conductivity and high strength for components operating in high-temperature environments. This ensures the material performance of the components and can also be applied to other copper-based alloy materials requiring high strength, high thermal conductivity, and corrosion resistance. The product performance of this invention is: Rm: 305MPa, Rp0.2: 187MPa, A: 33.5%, conductivity: 81.33% IACS. It meets customer requirements and shows a significant improvement in performance compared to copper-chromium-zirconium alloys. Copper-chromium-zirconium alloy performance: Rm: 230-285MPa, Rp0.2: 86-160MPa, A: 29.0-40.0%, conductivity: 78.0-83.0% IACS. Areas not detailed in this invention represent existing commonly used technologies. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to embodiments and specific implementation methods:

[0019] Example 1

[0020] A high-copper alloy rod, Φ40mm;

[0021] Performance requirements: Rm≥280MPa, Rp 0.2 ≥120MPa, A≥18%, conductivity: ≥65%IACS;

[0022] Alloy composition: Ni: 1.5%; Cr: 0.6%; Ce: 0.05%; Impurities: ≤0.3%; Balance: Copper Cu; The sum of the above components is 100%.

[0023] Melting and casting: Melting and casting is carried out using a medium-frequency vacuum induction furnace. The furnace temperature is 1280℃ and the casting time is 5.5min. The casting is done to produce ingots with a diameter of φ245mm.

[0024] Extrusion: Extrusion is carried out using a 3000-ton extruder. The extrusion process is as follows: heating temperature: 920℃, extrusion speed: 15mm / s, residual thickness: 30mm, and extrusion into φ55mm billet.

[0025] Quenching: Performed online, the extruded rod is directly introduced into the cooling water tank, with an inlet water temperature of 900℃;

[0026] Stretching: A 200KN hydraulic stretching machine was used for stretching to Φ40mm, with a total stretching rate of 47%.

[0027] Finished product aging: Finished product aging is carried out using a car bottom quenching furnace, aging temperature: 550℃, holding time: 200min;

[0028] Packaging and warehousing: After the finished products are inspected, they are packaged and put into storage.

[0029] Performance: Rm: 313MPa, Rp0.2: 198MPa, A: 28.5%, conductivity: 78.25%IACS; meets customer requirements.

[0030] Example 2

[0031] A high-copper alloy rod, Φ10mm;

[0032] Performance requirements: Rm≥280MPa, Rp 0.2 ≥120MPa, A≥18%, conductivity: ≥65%IACS;

[0033] Alloy composition: Ni: 0.5%; Cr: 0.2%; Ce: 0.003%; Impurities: ≤0.3%; Balance: Copper Cu; The sum of the above components is 100%.

[0034] Melting and casting: Melting and casting is carried out using a medium-frequency vacuum induction furnace. The furnace temperature is 1260℃ and the casting time is 3.5min. The casting is done to produce ingots with a diameter of φ195mm.

[0035] Extrusion: Extrusion is carried out using a 3000-ton extruder. The extrusion process is as follows: heating temperature: 970℃, extrusion speed: 25mm / s, residual thickness: 50mm, and extrusion into φ30mm billet.

[0036] Quenching: Performed online, the extruded rod is directly introduced into the cooling water tank, with an inlet water temperature of 960℃;

[0037] Stretching: A 200KN hydraulic stretching machine was used for stretching, with a total stretching rate of 88.9%.

[0038] Finished product aging: Finished product aging is carried out using a car bottom quenching furnace, aging temperature: 450℃, holding time: 300min;

[0039] Packaging and warehousing: After the finished products are inspected, they are packaged and put into storage.

[0040] Performance: Rm: 305MPa, Rp0.2: 187MPa, A: 33.5%, conductivity: 81.33%IACS; meets customer requirements.

Claims

1. A high-copper alloy rod, characterized in that: The composition of the high-copper alloy rod is: Ni: 0.3-1.5%; Cr: 0.2-0.6%; Ce: 0.003-0.05%; Impurities: ≤0.3%; Balance: Cu; The sum of all the above components is 100%; Specifications: φ10-40mm.

2. A method for processing high-copper alloy rods as described in claim 1, characterized in that: The process flow is as follows: melting and casting - extrusion - online quenching - stretching - finished product stretching - finished product aging - packaging and warehousing; Melting and casting: Melting and casting is carried out using a medium-frequency vacuum induction furnace. The furnace temperature is 1150-1350℃, the casting time is 4.0-6.0min, and the casting is done in ingots with a diameter of φ70-245mm. Extrusion: Extrusion is carried out using an extruder, with a heating temperature of 900-980℃, an extrusion speed of 15-35mm / s, and a residual thickness of 30-60 mm, to produce bar billets with a diameter of φ20-120 mm; Online quenching: Quenching is performed by directly immersing the extruded rod into the water bath online. The quenching water temperature is 900-960℃. Stretching: A hydraulic stretching machine is used for stretching, with a processing rate of 25-65%. Finished product stretching: Stretching is performed using a hydraulic stretching machine, with a finished product yield of 25-65%. Finished product aging: Finished product aging is carried out using a car bottom quenching furnace, aging temperature: 420-550℃, holding time: 180-360min; Packaging and warehousing: Finished products are inspected, and those that pass the inspection are packaged and put into storage.