Abstract
At the present time, many Extra Super Critical Pressure Boiler are made by 9%Cr steel for thermal power station in Japan. these power station have been in operation for a total of over 100,000 hours, Actual-Size Burst Equipment capable of reproducing actual equipment damage (Type IV damage) and FEM are used to solve this burst mechanism. Worlds first time, pipe-reinforcing technique that used band steels etc. for Welding part at 9%Cr steels was developed, it was that was not welded. It was developed 3 types, (1)Winding Band Steels (for inner pressure) (2)One touch Flange(for inner pressure) (3) One touch Flange(for bending moment). Band steels can wind for every shape, Therefore, It is very easy methed,but,it is easy to be individual differences Type IV damage for 9%Cr Welding Part was reduced. It resulted that Life could extend for high temperature boilers.
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