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T23 is used at 500 to 600°C in modern power station. The chemical composition is designed with respect for manufacture of membrane walls without preheating and, if possible, without heat treatment.1) The weldability is improved by decreasing carbon content to under 0.1% and economical alloying with Cr, Mo, V, W and B. The reduction of these elements to a bare minimum guaranteeing creep resistance also decreases the carbon equivalent, and thereby the preheating is not necessary during welding.2) The joints are typically multipass butt welds and are laid down under conditions of severe structural restraint. The residual stresses thus developed may be of the same order of magnitude as the yield stress, and are relieved by applying a post-weld heat treatment (PWHT) which involves heating for several hours3) in the temperature range from 720 to 800°C.4) 750°C or 760°C is usually selected as the PWHT temperature at present.2) Due to the metastable nature of the strengthening precipitates, the carbides undergo undesirable transformation during elevated temperature service or during PWHT. The Hot Ductility Loss and Recovery in the CGHAZ of T23 Steel during Post-weld Heat Treatment at 750°C