可锻铸铁。球墨铸铁。

Smithing cast iron. Nodular cast iron.

钢和球墨铸铁建设。

Steel and ductile iron construction.

灰铸铁，球墨铸铁，铸钢，阀体不锈钢。

Grey cast iron, nodular cast iron, cast steel, stainless steel.

它的球墨铸铁外壳确保了在恶劣的环境坚固和可靠的性能。

Its ductile cast iron enclosure ensures rugged and reliable performance in the harshest environments.

对于大断面球墨铸铁件，有防止球化不良和消除反白口的作用。

It has the effect keeping heavy section ductile iron casting from...