Hot steel is quenched to harden it.

烧热的钢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.

采用加热熔化、蒸发、骤冷工艺制备超细粉,对产品的部分化性能进行了测试。