Abstract
Qualitative analysis to high temperature tensile strength, creep strength and creep ductility of type 308 stainless steel weld metal was performed by using obtained available experimental data. As a result, the effects of interstitial solid solution elements, substitutional solid solution elements, carbide precipitation hardening elements, welding heat input and plate thickness on these properties were made clear.
From the result of qualitative analysis, the formulas of tensile strength and creep strength at 550°C for type 308 stainless steel weld metal were established by multiple regression analysis.
Finally, two types of weld metal, 0.06 mass%C-0.02 mass%N-0.7 mass%Mo and 0.02 mass%C-0.08 mass%N-3 ferrite number, were proposed as the most suitable type 308 stainless steel weld metal for fast breeder reactor by considering the results of qualitative analysis, multiple regression analysis and microstructure observation.
