Influence of annealing on structure and corrosion resistance of Duplex and Super Duplex stainless steel

One of the basic criteria determining the suitability as a structural material is its corrosion resistance. In addition, abrasion resistance, heat resistance, mechanical strength are also important. The properties of austenitic-ferritic two-phase Duplex steels resulted in its various applications, among others, in radiators, dryers, structures working in aggressive environments. In this paper the changes in the structure of Duplex steel and Super Duplex steel subjected to long-lasting annealing processes at two different temperatures were investigated. The aim of these studies was demonstrating changes in properties resulting from the effects of elevated temperature and assessing whether such steels can work in a given temperature range.