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1. The carbon content of mild steel is much lower than cast-steel.
   软钢的含碳量要比铸钢的低得多。
2. Mild steel is usually used for general engineering purposes.
   软钢通常用在一般工程上。
3. We don't make cutting tools from low carbon steel.
   我们不用低碳钢制造切削刀具。
4. For welding low carbon steel structres.
   焊接低碳钢结构。