WELD PROPERTIES OF SANDVIK SAF 2707 HD®
Abstract(petro-) chemical processing industry. The recently developed hyper duplex grade Sandvik SAF 2707HD® allows extension of the application range of austenitic-ferritic alloys into even more aggressive conditions. In most applications for Sandvik SAF 2707 HD the equipment needs to be welded. Hence, weldability is of utmost importance for a stainless steel grade of this kind. Weld documentation was made for a number of joints to simulate various tube- and pipe applications. The welding method used was gas tungsten arc welding. The joints were tested regarding mechanical properties, microstructure, pitting resistance and in some cases chloride stress corrosion resistance. The filler wire used, designated Sandvik 27.9.5.L, was developed specifically for Sandvik SAF 2707 HD. Overlay welds were produced using submerged-arc welding and gas tungsten arc welding. The welds were documented regarding ductility, microstructure and pitting resistance. Tube-to-tube sheet welds were also produced to document the weld behaviour and pitting resistance.