salt-bath hardening furnace

例句：

1. 1. The salt-bath hardening furnace is used to treat metal parts to improve their strength and durability.
   盐浴硬化炉用于处理金属零件，以增强其强度和耐用性。
2. 2.During the salt-bath hardening process, the metal undergoes a chemical reaction that causes it to harden.
   在盐浴硬化过程中，金属经历化学反应，导致其变硬。
3. 3. The salt-bath hardening furnace is an essential tool in the manufacturing industry for producing high-quality metal products.
   盐浴硬化炉是制造业生产高质量金属产品的关键工具。