Steel and ductile iron construction.

钢和球墨铸铁建设。

Ductile iron body able to withstand rough handling.

球墨铸铁阀体能够经受恶劣的操作环境。

Ductile iron shows exceptional resistance to shock loading.

球墨铸铁具有特别的抗冲撞装卸的性能。

NL-1 is a naw type of corrosion resistant low alloyed ductile iron.

研制了一种新型低合金耐盐卤腐蚀的球铁材料（代号NL-1）。