The exploiting background and present stature of grade development for supercritical and ultra-supercritical boiler tubes are introduced in this article including the main chemical composition
mechanical properties and corrosion resistance of ferrite boiler tubes
new austenite stainless steel boiler tubes
nickel base alloy boiler tubes
adding W 2. 25% Cr (T/P23 ) steel tubes
modified 9% Cr-1 % Mo (T/P91) steel tubes
adding W 9% Cr (T/P92) steel tubes and bimetallic compound tubes.