▎ 摘　　要

NOVELTY - A quenching medium comprises 1-10 pts. wt. graphene solid particles with particle size of 0.1-100 mu m in 100-10000 pts. wt. water or water-based quenching liquid. USE - Quenching medium for use in cooling metal components (claimed). ADVANTAGE - The quenching medium satisfies accuracy requirements of mechanical properties and deformation of metal components. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing quenching medium, which involves processing graphene into granules, and dispersing the graphene granules in mineral oil, water or water-based quenching liquid.