Chinese utilities as well as those worldwide are facingincreased demand for additional electric-ity, reduced plant emissions and greater efficiency.To meet this challenge willrequire increas-ing boiler temperature,pressure and coal ashcorrosion resistance of the materials of boiler construction of future coal-fired boilers. A new nickel-based tube alloy, INCONELRalloy 740,is described aiming at meeting this challenge. Emphasis will be on describing the alloy s mechanical properties, coal-ash and steam corrosion resistance.Microstructural stability as a function of temperature and time is addressed as well as some of the early methodology employed to arrive at the current chemical composition.
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