双层铸铁注砂管是鞍钢铸管厂于1955年研制成功的新产品,目前在国内外尚无同类产品可比。它是采用复合浇铸工艺,经过离心铸造而成,外层为球墨铸铁,内层为白口铸铁,故又称为球墨双金属注砂管,可代替高锰钢管用于采掘工业,特别 Double-layer cast iron sand injection pipe is Anshan Iron and Steel Pipe Casting Plant successfully developed in 1955 new products, at home and abroad currently no comparable products. It is a compound casting process, after centrifugal casting, the outer layer of ductile iron, the inner layer of white cast iron, it is also known as ductile metal injection sand tube, instead of high manganese steel pipe for the mining industry, especially