Method of making multi-component composite metallic tube

A method of making a bi-component, composite metallic tube, comprising the steps of:

• forming an extrudable, bi-component billet by providing an inner component formed from a first metallic material, and an outer component formed from a second metallic material, wherein the metallic material of said, outer component is selected to optimize resistance to corrosion from combustion gases including positioning said inner component within said outer component, and explosively bonding said first and second components to form a metallurgical bond an interface of said components, wherein said second metallic material is alloy UNS N06022, UNS N06600, or UNS R20033;
• drilling an opening through said inner component of said billet;
• elevating the temperature of said billet by induction heating said billet;
• coextruding said bi-component billet to form a bi-component, composite metallic tube having a generally cylindrical configuration, wherein said composite tube comprises an inner layer formed from said first metallic material, and an outer layer formed from said second metallic material, to thereby form said composite tube with a metallurgical bond at an interface between said inner and outer layers of said composite tube;
• and
• installing said composite tube in a boiler panel, wherein second metallic material is exposed to fossil-fired combustion gases.