Creep investigation and simulation of CB2 joints using similar rutile CB2 flux-cored wire

The modified 9Cr-1.5Mo-1Co steel with boron addition, designated as CB2, is one of the most promising and creep-resistant cast steels for the application in thermal power plants. To produce big cast components for steam power plants, the welding processes are an integral part of the manufacturing procedure. Therefore, an appropriate filler metal with similar properties as the base material is required. So the CB2 filler metal is target for intensive researches. In this work, creep rupture tested welding joints of rutile CB2 flux-cored wires are investigated. The objective of the paper is to compare two filler metal compositions with different nickel contents after two different creep conditions. The first comparison is concerning the creep resistance, and the second comparison is concerning the simulated microstructure with its precipitates. Differences and agreements are discussed.