SINGLE LAYER BUILD UP WELDING OF AUSTENITIC STAINLESS STEEL EXCELLENT IN PEELING CRACK RESISTANCE

摘要

PURPOSE:To obtain single layer build up welding of austenitic stainless steel excellent in peeling crack resistance by using an electrode of stainless steel and flux on base metal of carbon steel or low alloy steel and making the composition to satisfy a specific formula when making surface build up welding. CONSTITUTION:In surface build up welding using an electrode of stainless steel and flux, Cr equivalent of the base metal and weld metal corresponding to (% Cr)+(% Mo)+1.5X(% Si)+0.5X(% Nb) is made respectively to CreqB, CreqD. Ni equivalent of base metal and weld metal corresponding to (% Ni)+30X{(% C)+(% N)}+0.5X(% Mn) are made respectively to NieqB, NieqD. In obtaining weld metal of austenitic stainless steel containing C, Si, Mn, Ni, Cr, Mo, Nb and N sufficient in quantity to satisfy the formula, by adding less than 2% Ni from flux and restricting delta ferrite phase to less than 8%, single layer build up welding of austenitic stainless steel excellent in peeling crack resistance is obtained.