Clad tubular product and method of manufacturing same

Abstract

A method of manufacturing clad tubular product from a hollow carbon steel billet having an inner diameter and a hollow corrosion resistant alloy billet having an outer diameter, comprising the steps of: machining the inner diameter of the hollow carbon billet and the outer diameter of the hollow corrosion resistant alloy billet to result in an interference fit between the two billets at room temperature when the corrosion resistant billow is placed inside the carbon billet; heating the hollow carbon billet in a furnace until the carbon billet reaches a temperature in the range of approximately 400.degree. F. to about 850.degree. F.; inserting the corrosion resistant billet inside of the hollow carbon billet while the carbon billet is at a temperature in the range of approximately 400.degree. F. to about 850.degree. F., and the corrosion resistant alloy billet is at approximately room temperature, thereby forming a composite billet; cooling the composite billet to room temperature; welding the corrosion resistant alloy billet to the carbon billet at one end of the composite billet; preheating the composite billet with a heating element placed within the interior of the corrosion resistant alloy billet to a temperature in the range of approximately 400.degree. F. to about 800.degree. F.; globally heating the preheated composite billet to an extrusion temperature in the range of approximately 1850.degree. F. to about 2350.degree. F.; and, extruding the heated composite billet to produce the clad tubular product; and the product produced by the method.

Dependencies are inferred from the claim text.