Preparation method of high-strength and high-conductivity Cu-Cr-Zr bar

A technology of copper chromium zirconium and high conductivity, which is applied in the field of copper alloys, can solve the problems that it is difficult to achieve high strength, high conductivity, reduce conductivity, and cannot achieve high strength and high conductivity, so as to achieve high strength, reduce energy consumption, crystal grainy effect

CN112831686AActive Publication Date: 2021-05-25JINTIAN COPPER GROUP CORP NINGBO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-05-25

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Abstract

The invention discloses a preparation method of a high-strength and high-conductivity Cu-Cr-Zr bar. A Cu-Cr-Zr alloy contains 0.6-1.0 wt% of Cr, 0.035-0.10 wt% of Zr and the balance Cu and inevitable impurities. The method is characterized by comprising the following technological processes: (1) casting is conducted to obtain a Cu-Cr-Zr alloy casting blank; and (2) hot rolling is conducted, specifically, the Cu-Cr-Zr alloy casting blank is subjected to hot working with the deformation of 80%-95%, the rolling temperature is 960-990 DEG C, the rolling speed is 30-40 m / min, and quenching and rolling are conducted after the last pass of rolling. According to the method, the superposition of precipitation strengthening, work hardening and fine grain strengthening mechanisms is utilized, high strength and high conductivity are achieved at the same time, the hardness HRB is larger than or equal to 85, the conductivity is larger than or equal to 85% IACS, and the method plays a positive role in prolonging the service life of consumables for electric resistance welding, brazing and the like and reducing energy consumption.
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Description

technical field

[0001] The invention relates to the technical field of copper alloys, in particular to a method for preparing high-strength and high-conductivity copper-chromium-zirconium rods. Background technique

[0002] Copper chromium zirconium (C18150) rods are widely used in the preparation of electrodes for resistance welding and brazing because of their high strength, high electrical conductivity and high temperature softening resistance. Since the welding electrode is in a high-temperature and high-pressure environment, its hardness gradually decreases with time, and it is prone to wear and tear, which in turn affects the welding quality. In order to ensure the welding quality, the electrode needs to be replaced frequently, which increases the production cost. Therefore, improving the hardness of the copper-chromium-zirconium rod can keep the welding electrode relatively high hardness at high temperature, which has a positive effect on prolonging its service life ...

Examples

Embodiment 1

[0027] The composition of copper chromium zirconium is: Cr: 0.65wt%, Zr: 0.045wt%, the rest is Cu and unavoidable impurities, and the impurity content is not more than 0.1%; the process flow of copper chromium zirconium rods:

[0028] 1) Casting: the melting temperature is controlled at 1280°C, the cooling water pressure is 0.3MPa, the copper-chromium-zirconium alloy billet diameter is 80mm, the casting speed is 25mm / min, and the billet length is 6m;

[0029] 2) Hot rolling: heat the cast slab with a diameter of 80mm to 990°C, keep it warm for 30 minutes, then continuously roll it to a diameter of 20mm, quench and coil, the total deformation is 93.75%, and the rolling speed is 30m / min;

[0030] 3) pickling: put the hot-rolled billet into the pickling tank for pickling for 15 minutes to remove the surface scale;

[0031] 4) continuous extrusion: the wire billet after pickling is carried out continuous extrusion, extrusion speed is set as 3m / min, extruded into the wire billet th...

Embodiment 2

[0037] The composition of copper chromium zirconium is: Cr: 0.55wt%, Zr: 0.075wt%, the rest is Cu and unavoidable impurities, of which the impurity content is not more than 0.1%; the process flow of copper chromium zirconium rods:

[0038] 1) Casting: the smelting temperature is controlled at 1300°C, the cooling water pressure is 0.3MPa, the copper-chromium-zirconium alloy billet diameter is 50mm, the casting speed is 30mm / min, and the billet length is 7m;

[0039] 2) Hot rolling: heat the casting slab with a diameter of 50mm to 970°C, keep it warm for 20 minutes, then continuously roll it to a diameter of 15mm, quench and coil, the total deformation is 91%, and the rolling speed is 40m / min;

[0040]3) pickling: put the hot-rolled billet into the pickling tank for pickling for 15 minutes to remove the surface scale;

[0041] 4) Continuous extrusion: the pickled wire billet is continuously extruded, the extrusion speed is set at 5m / min, and extruded into a wire billet with a di...

Embodiment 3

[0047] The composition of copper chromium zirconium is: Cr: 0.95wt%, Zr: 0.075wt%, the rest is Cu and unavoidable impurities, of which the impurity content is not more than 0.1%; the process flow of copper chromium zirconium rods:

[0048] 1) Casting: The smelting temperature is controlled at 1350°C, the cooling water pressure is 0.3MPa, the copper-chromium-zirconium alloy billet diameter is 60mm, the casting speed is 20mm / min, and the billet length is 6m;

[0049] 2) Hot rolling: heat the casting slab with a diameter of 60mm to 960°C, keep it warm for 60 minutes, and then continuously roll it to a diameter of 25mm for quenching and winding, the total deformation is 82.64%, and the rolling speed is 35m / min;

[0050] 3) pickling: put the hot-rolled billet into the pickling tank for pickling for 15 minutes to remove the surface scale;

[0051] 4) Continuous extrusion: the pickled wire billet is continuously extruded, the extrusion speed is set at 2.5m / min, and the diameter is ex...