... carbon steel, inner is titanium, copper,nickel,iron, stainless steel, save a lot cost bimetal pipe ,carbon steel composite pipe, is produced ... copper, titanium,nickel, Monel, zirconium, etc.) inner lining, it can save a lot of expensive non-ferrous metal material and decrease the ... of composite pipe can replace expensive single metal pipe and save a lot of money for user. bimetal pipe