Super austenitic stainless steels have the same alloy structure as conventional 300 series austenitic grades. However, their enhanced levels of chromium, nickel, molybdenum, copper and nitrogen provide them with superior resistance to chloride pitting, crevice corrosion, stress corrosion cracking and uniform corrosion. The high nitrogen content in some super austenitic stainless steels provides higher mechanical properties than the conventional 300 series stainless grades enabling them to be designed in thinner cross sections. Super austenitic are utilized where the corrosion resistance of 316L, 317L and duplex stainless steels are not adequate or as a cost-effective substitute for some nickel alloys.
Super-austenitic stainless steel alloy with a composition, balanced in such a way that the alloy and products made from the alloy fulfil high requirements on a combination of high corrosion resistance, especially in inorgnic and organic acids and mixtures thereof, good general corrosion resistance, good structure stability as well as improved mechanical properties in combination with good workability, in particular in the embodiment tubes, especially seamless tubes and seam welded tubes for application in said environments and with following composition, in wight-percent: Cr 23.0-30.0, Ni 25.0-35.0, Mo 2.0-6.0, Mn 1.0-6.0, N 0-0.4, C up to 0.05, Si up to 1.0, S up to 0.02, Cu up to 3.0, W 0-6.0 a or more element of the Group Mg, Ce, Ca, B, La, Pr, Zr, Ti, Nd up to 2.0 and the balance being Fe and normally occurring impurities and steel making additions.
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