This kind of product can produce 15 meters at the longest and 0.5mm at the thinnest. This kind of steel tube is an important material for large and extra-large boilers, heat ex-changers, condensers and fluid transportation used in thermal power, nuclear power, petroleum refining and chemical industries. In addition to conventional  Austenitic stainless steel seamless steel tubes, it also produces such as supercritical boiler tubes 304H, 347H, 347HFG、310HCbN。Super austenite such as 904L, 254SMO, which has strong resistance to pitting corrosion, crevices, chloride ion stress corrosion and intergranular corrosion resistance, especially for sulfate ion, chloride ion and other acid ions have good corrosion resistance, can be used in extremely harsh working environment, so the application of super austenite stainless steel is more and more widely.