half-hard steel

例句：

1. 1.This half-hard steel is suitable for cutting hard materials.
   这种半硬钢适合切割硬质材料。
2. 2.The construction equipment uses half-hard steel as its main material.
   施工设备主要使用半硬钢作为其材料。
3. 3.The half-hard steel has a high strength and toughness, which makes it very useful in industrial applications.
   半硬钢具有很高的强度和韧性，使其在工业应用中非常有用。