High-vanadium high-speed steel and preparation method therefor, and use thereof

Abstract

The present invention provides a high-vanadium high-speed steel and preparation method therefor, and use thereof, which relate to the technical field of high-vanadium high-speed steel. The preparation method includes: smelting raw materials to form a melt; impacting the melt to a cooling platform to form a high-vanadium high-speed steel casting billet; and performing a spheroidizing annealing treatment and a quenching and tempering treatment, so as to obtain a resultant. The spheroidizing annealing treatment includes: heating the high-vanadium high-speed steel casting billet to 820-910°C; holding for 2-4h; then cooling down to 450-550°C at a cooling rate larger than 40°C / h; and then air cooling to a room temperature. It can play roles of crushing grains and crushing primary carbides when performing the melt impacting, so that the formed ingot microstructure is dense and uniform, and the carbide is fine. The rapid spheroidizing annealing process is used to realize the rapid annealing, so that the carbide in the high-vanadium high-speed steel is not easily agglomerated, and is uniformly distributed in conglobate shape, which is time-saving and high-efficient, and is beneficial to improving the mechanical property of the high-vanadium high-speed steel.

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