carbon steel

例句：

1. 1. This type of steel is commonly used in construction because it's strong and durable.
   这种类型的钢材常用于建筑，因为它既坚固又耐用。
2. 2.The engineer decided to use carbon steel for the structural beams.
   工程师决定使用碳钢来制作梁。
3. 3.Carbon steel is often used in manufacturing machinery due to its high strength-to-weight ratio.
   由于其高强度与低重量的比率，碳钢常用于制造机械。