Composite hollow pipe billet was successfully manufactured by centrifugally pouring 10 type steel on the outer layer firstly and then pouring 1Cr18Ni9Ti stainless steel on the inner layer. The pipe billet with inner and outer surface treated was prepared to the carbon steel /stainless steel composite pipe with 47 mm in diameter and 4.5 mm in length by hot extrusion and cold rolling

and composite pipe manufactured with stainless steel by centrifugal casting was described. The microstructure

properties and bonding layer of the composite pipe were investigated. The results show that inner and outer layer exhibit desirable metallurgical bonding effects

and grain size is greatly refined. Grain size in the pipe after final rolling is transformed from 3.0～3.5 grade at as-cast state into 7.0～8.0 grade. Grain-boundary corrosion meets the requirements after bending

flattening and heat treatment.