INFLUENCE OF MICROALLOYING WITH BORON, ZIRCONIUM AND TELLURIUM ON THE CORROSION RESISTANCE OF AUSTENITIC STAINLESS STEEL X8CrNiS18-9
More recently a modified stainless steels has been used for production of various structural elements that work in complex operating conditions. Steel X8CrNiS18-9 (standard EN 10088-3: 2005) is the most commonly used from the group of austenitic stainless steel in terms of machinability. The content of sulphur in the steel from 0,15 to 0,35% has the exclusive task to improve the machinability. However, while sulphur improves machinability it simultaneously reduces the steel corrosion resistance, but also affects the decrease in mechanical properties particularly steel toughness. Corrosion resistance tests of X8CrNiS18-9 stainless steel samples were performed on the potentiostat / galvanostate PAR 263A-2. The aim of this work is that determine the influence of boron, zirconium and tellurium on the corrosion resistance of the mentioned steel. Change of corrosion resistance, depending on the chemical composition of the steel is simulated with Matlab program.