FAILURE ANALYSIS OF A SERVICE-EXPOSED HOT REHEAT STEAM LINE IN A UTILITY STEAM PLANT ; THE INFLUENCE OF FLUX COMPOSITION OF THE ELEVATED TEMPERATURE PROPERTIES OF CR-MO SUBMERGED ARC WELDMENTS (To Purchase Call 1-800-854-7179 USA/Canada or 303-397-7956 Wo
The two papers contained in this Bulletin provide definitive information concerning the elevated temperature rupture behavior of 2 1/4Cr-1Mo weld metals. The first paper gives a detailed metallurgical failure analysis of cracking in a longitudinally welded hot reheat pipe with 184@000 hours of operation at 1050o F. The second paper defines the role of the welding flux in submerged arc welding of 2 1/4Cr-1Mo steel. Publication of this report - WRC Bulletin No. 354 was sponsored by the Steering and Technical Committees on Piping Systems of the Pressure Vessel Research Council of the Welding Research Council. A crack approximately 14 inch long was discovered in a longitudinal seam weld in a hot reheat line of TVA Gallatin Unit 2 during ultrasonic inspection (and subsequent by by MT examination). Initially a boat sample was removed and an entire spool piece (20 ft) was subsequently replaced. A metallurgical evaluation was undertaken to determine the characteristics of the defect and the reason for its occurrence.