Hot steel is quenched to harden it.

烧放入水中骤冷使之坚硬。

Some physico-chemistry properties of ultrafine zinc dust produced by the process of melting vapourizing shock-cooling of metallic zinc are measured.

采用金属锌加熔化、蒸发、骤冷工艺制备超细锌粉,对产品部分化性能进行了测试。