Corrosion behaviour of duplex stainless steel weld metals with nitrogen additions

The addition of nitrogen to duplex stainless steel weld metal has been achieved and the resultant weld metals have been assessed for their microstructural features and corrosion behaviour. It was found that, although autogenous welding of duplex stainless steels is not recommended, the addition of nitrogen through the shielding gas mixture can help to obtain quality welds with the desired phase balance and corrosion resistance. CEST11996 At the time this work was carried out Mr Muthupandi and Mr Bala Srinivasan were in the Department of Metallurgical Engineering, Regional Engineering College, Tiruchirappalli 620 015, India. Dr Seshadri and Dr Sundaresan are in the Department of Metallurgical Engineering, Indian Institute of Technology (Madras), Chennai 600 036, India. Mr Bala Srinivasan is now with WZK - Corrosion Group, GKSS - Forschungs-zentrum Geesthacht GmbH, Institute for Materials Research, Max-Planck-Strasse, 21502 Geesthacht, Germany. (Bcii(i.Si-iiiii,asaii@gkss.de). Manuscript received 24 July; 2002; accepted 23 July 2003. (C) 2003 IoM Communications Ltd Published by Maney for the Institute of Materials, Minerals and Mining.