INFLUENCE OF BORON, ZIRCONIUM, AND TELLURIUM ON THE IMPACT
TOUGHNESS OF X8CrNiS18-9 STEEL

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 present 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 resistance of steel to corrosion but also affects the decrease in mechanical
properties particularly steel toughness. Due to its harmful effect on the steel, as well as the fact that the
non-metallic inclusions are insufficiently tested for this type of high-alloy steel the aim of this study is to
determine the appropriate microalloying possibility to modify the non-metallic inclusions.
The aim of this work is that explore the influence of boron, zirconium, and tellurium on the impact
toughness of the mentioned steel. Change of impact toughness, depending on the chemical composition of
the steel is simulated with the Matlab program.