Copper-chromium-zirconium alloy cast ingot and preparation method and application thereof

The invention discloses a copper-chromium-zirconium alloy cast ingot and a preparation method and application thereof. The preparation method comprises the following steps that raw materials are subjected to smelting, casting, casting and ingot casting cooling, and then the alloy is obtained. The raw materials comprise the following components in percentage by mass: 1.6-2.5% of chromium, 0.05-0.16% of zirconium, 0.05-0.1% of rare earth Re and the balance of copper and inevitable impurities; chromium is added in a copper-chromium intermediate alloy mode, and zirconium is added in a copper-zirconium intermediate alloy mode; the preparation method comprises the following steps: smelting copper at the smelting temperature of 1190-1360 DEG C to obtain molten copper, and sequentially adding chromium and rare earth Re into the molten copper under the protection of inert gas; the casting temperature ranges from 1350 DEG C to 1370 DEG C; in the casting step, non-vacuum down-drawing continuous casting is carried out. T