Study on Welding Performance of SA738 Gr.B Steel for Steel Containment Shells
SA738 Gr.B steel is one of the main materials for nuclear power steel containment shells due to its low carbon content and good mechanical properties,which are commonly used in the butt welding of steel containment shells.Due to the presence of Cr,Mo and other elements in SA738 Gr.B,problems such as hardening,cold cracking,and thermal strain embrittlement may occur during welding.In this study,tensile,bending,impact,chemical analysis,macroscopic metallography,microscopic metallography,and drop weight tests were conducted on the welded and heat-treated test plates.Through experimental research,it was found that by selecting the correct welding materials,reasonable welding process parameters,and heat treatment specifications for SA738 Gr.B steel,good forming effects can be achieved,and the mechanical properties of the welded joints can meet the test requirements.
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