heat-treated steel

例句：

1. 1. This type of steelis commonly used in construction due to itshigh strength and toughness.
   这种类型的钢因其高强度和韧性而常用于建筑。
2. 2.Heat treatment is an essential process for improvingthe properties of steel.
   热处理是改善钢材性能的关键过程。
3. 3. The heat-treated steelwas used to reinforce the bridge'sstructure.
   热处理过的钢材被用来加固桥梁的结构。