Patent ID: 8281976
Filing Date: 2012-10-09
Classification: B23K

Abstract:
1. A method of making a multi-component, composite corrosion-resistant metallic boiler tube, comprising the steps of: forming an extrudable, multi-component billet by providing an inner component formed from a first metallic material, and an outer component formed from a second metallic material, including positioning said inner component within said outer component, and explosively bonding said inner and outer components to form a metallurgical bond at an interface of said components including explosively bonding said outer component to the exterior of said inner component, wherein said second metallic material is alloy UNS N06022, UNS N06600, or UNS R20033 to optimize corrosion-resistance; drilling an opening through said inner component of said multi-component billet; coextruding said multi-component billet to form a multi-component, composite metallic tube, 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 metallic tube with a metallurgical bond at an interface between said inner and outer layers of said composite metallic tube; and installing said composite metallic tube in a boiler panel, wherein said second metallic material of said outer layer is exposed to fossil-fired combustion gases.