free-machining steel

例句：

1. 1. The new machine uses free-machining steel to ensure precision and efficiency.
   新机器使用自由机械钢以确保精度和效率。
2. 2. The construction of this bridge required the use of free-machining steel for its structural integrity.
   这座桥梁的建设需要使用自由机械钢来确保其结构完整性。
3. 3. The manufacturer claims that their free-machining steel is superior to other materials in terms of strengthand durability.
   制造商声称，他们的自由机械钢在强度和耐用性方面优于其他材料。