Austenitic stainless steel is a kind of stainless ones that have high corrosion resistance, good cold resistance and toughness, ductility as well as weldability, yet with low strength. Austenitic stainless steel is made of the austenitic microstructure at room temperature. Austenitic stainless steel has high toughness and ductility with low strength, but it can be strengthened via cold working. And by adding the elements of S, Ca, Se, Te, etc., can entitle austenitic stainless steel good free cutting performance. The steel has the oxidation resistance under acid corrosion medium if element such as Mo, Cu is added. High amount of silicon makes it have a good corrosion resistance under concentrated nitric acid. Because of comprehensively good performance, austenitic stainless steel is widely used in all walks of life.