灰口铸铁管件
Gray iron castigs for pipe fittings
球墨铸铁管(铸管)
spheroidal cast iron pipe
灰铸铁管和配件
grey iron pipe and fitting
稀土灰口铸铁
rare earth grey cast iron
稀土灰口铸铁高压暖气片
radiator of rare-earth grey cast iron
薄壁灰铸铁件
thin wall gray iron casting
非热处理灰铸铁
Non-hest treatment grey iron