• Bohler Welding Group India Private Limited

Duplex Stainless Steels

Austenitic-ferritic stainless steels, usually referred to as duplex steels, combine many of the good properties of ferritic and austenitic stainless steels. The high chromium content in combination with nitrogen, and often also molybdenum, gives duplex steels their superior resistance to both pitting and crevice corrosion. The duplex structure gives very good strength and, allied with the high corrosion resistance, very good resistance to stress corrosion. Thanks to this exceptional combination of strength and corrosion resistance, duplex steels are widely used in everything from tanks for corrosive media to structural components, chemical tankers and offshore applications. Duplex steels are primarily intended for applications where the working temperature is from -40 to +250?C. The weldability of duplex steels is good and all common welding methods can be used. Matching fillers are used for welding. Fillers that are more highly alloyed can also be used, e.g., LDX 2101, 2304 and 2205 can be welded with 2507/P100.