METHOD FOR TREATING SURFACE OF STEEL TUBE FOR SULFODATION CORROSION RESISTANT AND EROSION-RESISTANT BOILER

摘要

PROBLEM TO BE SOLVED: To provide a method for treating the surface of a steel tube making available a boiler steel tube excellent in sulfication corrosion resistance and erosion resistance. ;SOLUTION: The outer surface of a steel tube tube is thermally sprayed with the one obtd. by incorporating 0.3 to 8wt.% Al into a self-fluxing alloy composed of No-Cr-B-Si-C-Fe-Co, a self-fluxing alloy of Ni-Cr-B-Si-C-Fe-Co-Cu, a self-fluxing alloy of No-Cr-B-Si-C-Fe-Co-Mo-Cu or a self-fluxing alloy composed of Ni-Cr-B-Si-C-Fe-Co-Mo-W, and, fusing treatment is executed or, after the thermal spraying, it is thermally sprayed with a self-fluxing alloy contg. no Al, and fusing treatment is executed.;COPYRIGHT: (C)1998,JPO