metallurgy of iron and steel

例句：

1. 1.Metallurgy is the science of producing metals and alloys.
   冶金学是生产金属和合金的科学。
2. 2. The development of new metallurgical processes has greatly improved efficiency.
   新金属工艺的发展大大提高了效率。
3. 3. Metallurgical engineers are responsible for designing and maintaining equipment used in metallurgical processes.
   冶金工程师负责设计和维护用于冶金过程的设备。