Preparation method of aging-free high-beryllium copper strip with high strength and high hardness

The invention provides a preparation method of a high-strength and high-hardness aging-free high-beryllium copper strip. The preparation method comprises the following steps: preparing materials; the method comprises the following steps: smelting electrolytic copper, electrolytic nickel and electrolytic cobalt, and casting; the alloy melt is subjected to semi-continuous casting; carrying out heat preservation on the beryllium-copper alloy ingot at 810-840 DEG C for 15-18 hours, and then carrying out hot rolling; the beryllium copper strip blank is annealed at the temperature of 570-590 DEG C and then cooled to the temperature below 40 DEG C; the beryllium copper strip blank discharged out of the furnace is subjected to face milling and multiple times of cold rolling in sequence; intermediate annealing is conducted on the cold-rolled beryllium copper strip blank, and then cooling is conducted to 35 DEG C or below; performing cold rolling and cleaning on the cooled beryllium copper strip blank for multiple time