Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When Cr is about 18%, Ni 8%-10% and C is about 0.1%, the steel has a stable austenitic structure. Austenitic chromium-nickel stainless steel includes the famous 18Cr-8Ni steel and the high Cr-Ni series steel developed on this basis by increasing the content of Cr and Ni and adding Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but the strength is low, it is impossible to strengthen it through phase change, and it can only be strengthened by cold working, such as adding S, Ca, Se, Te and other elements, it has good machinability.

Because austenitic stainless steel has good forming and corrosion resistance, it has been widely used in various fields including medical and personal wearable products. However, in recent years, it has been found in clinical use that nickel in stainless steel can cause human allergies and may induce other blood diseases. Therefore, the new high-nitrogen nickel-free stainless steel material came into being. The new medical stainless steel material using nitrogen instead of nickel not only avoids the potential harm of nickel, but also has excellent mechanical properties and biocompatibility.