heat treatment of steel

例句：

1. 1.The steel is subjected to a high temperature for its heat treatment.
   钢材经过高温进行热处理。
2. 2.Heat treatment is an important process in the manufacturing of steel products.
   热处理是钢铁制品制造过程中的一个重要过程。
3. 3. During the heat treatment process, the material's properties are altered.
   在热处理过程中，材料的性质会发生变化。