grey castings

• 灰铸铁件

grey castings的用法和样例：

例句

1. Some kinds of defects in plate castings of gray cast iron are discussed , and varies kinds of gating systems and their advantages or disadvantages are analysed in this articles.
   本文介绍了平板类灰铸铁件易产生的各类铸造缺陷及其在生产中常用的各种浇注系统，并分析了各类浇注系统的优缺点。