INFLUENCE OF NITROGEN ADDITION ON PHYSICAL-CHEMICAL PROPERTIES AND CORROSION RESISTANCE OF STAINLESS STEELS

Researched were the physico-chemical properties, hardening and corrosion resistance of Cr 18 Ni 10 N type austenitic chromium- nickel stainless steels of different purity by the impurities and with different nitrogen content: from impurity level to 0.220%. It is demonstrated that nitrogen alloying is beneficial both for hardening and improvement of corrosion resistance of steel under conditions when nitrogen has the form of solid solution. Addition of 0.186-0.220% of nitrogen doesn't reduce intercrystalline corrosion in standard environment of 0.5M H 2 SO 4 + 0.01M KSCN and improves resistance to general and pitting corrosion in chloride-containing environments. Pure nitric steel shows higher resistance to intercrystalline, general and pitting corrosion in chloride solutions than normal purity steel.