HEAT EXCHANGING COATED STEEL PIPE, ITS PRODUCING METHOD AND HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To solve a problem that corrosion resistance of a conventional heat exchanging tube being used at the high temperature part of water wall or in a boiler is insufficient even if a coating material, e.g. INCONEL625, is applied. SOLUTION: The heat exchanging coated steel pipe is provided, on the outer surface of a steel pipe, with a coating layer principally comprising one or more kind of compound containing aluminum and boron selected from AlB2 , AlB12 , Al3 BC and AlB12 C2 and containing 40-99 wt.% of aluminum and 1-45 wt.% of boron.