quench tempering

例句：

1. 1. The steel was subjected to quench tempering to improve its hardness and strength.
   钢材经过淬火回火处理以提高其硬度和强度。
2. 2. During the manufacturing process, quench tempering is used to remove internal stresses.
   在制造过程中，淬火回火用于消除内部应力。
3. 3.Quenching tempering is an essential step in the production of high-quality steel products.
   淬火回火是生产高质量钢铁产品的关键步骤。