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

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.

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 ...

AI Technical Summary

Problems solved by technology

The invention patent application number is CN200710069551.3, and "High-strength and high-conductivity low-calcium-boron-chromium-zirconium-copper alloy and its manufacturing method" is published. The patent achieves grain refinement and strengthens grain boundaries by adding trace elements of Ca, B, and Fe As can be seen from the performance data in the patent examples, when the hardness HRB is the highest 83, the conductivity is 82.76% IACS, when the conductivity is the highest 85.18% IACS, the hardness HRB is 80, and it is impossible to achieve "high strength, high conductivity "Unification of

The patent application number for the invention is CN201610813189.5 and "Anti-Softening Copper Alloy, Preparation Method and Its Application" is published. The patent also mentions the addition of trace amounts of Fe to improve the strength of copper-chromium-zirconium. It can be seen from the performance data in the patent examples It is shown that the conductivity is 75.2% IACS when the hardness HRB is the highest 88, and the hardness HRB is 75 when the conductivity is the highest 91.1% IACS. It is also impossible to achieve the unity of "high strength and high conductivity".

In summary, it can be seen that although trace elements can increase the hardness of copper chromium zirconium, but at the same time reduce its conductivity, it is difficult to achieve the unity of "high strength and high conductivity".

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