Austenitic stainless steel is generally consisting of 16-25 %wt Cr, 0.1%wt C and not less than 7.5% wt Ni, which is necessary to obtain austenitic structure. The interstitial alloying elements (like C and N) have a stronger impact on the constitutions and mechanical properties of steels than that of the substitutionals elements such as Ni, Mo. Carbon has always been used as alloying element in austenitic stainless steels because it is the remainder of the reduction process. The introduction of nitrogen in austenitic stainless steels good progress during the last few decades. The development of high nitrogen austenitic stainless steel is based on a superior combination of properties such as improved mechanical properties in the bulk and enhanced chemical properties at the surface and applications such as corrosion resistant materials and biomaterials. In this paper the needs, manufacturing and applications of high nitrogen austenitic stainless steels will be discussed. From literature survey, it has been observed that the solubility of N is more as compared to C in austenite. Due to high nitrogen content, the mechanical properties, corrosion resistance as well as compatibility with the human body have been improved.
Austenite, high nitrogen steel, corrosion, body friendly, carbide.
Akhilesh Kumar Chauhan, High Nitrogen Austenitic Stainless Steel, HCTL Open International Journal of Technology Innovations and Research (IJTIR), Volume 14, April 2015, eISSN: 2321-1814, ISBN (Print): 978-1-62951-946-3.