Patent ID: 6451133
Filing Date: 2002-09-17
Classification: C22C

Abstract:
A duplex ferritic-austenitic stainless steel alloy provided for seawater applications comprising, in weight %:Câ€‚maximum 0.05Simaximum 0.8Mn0.3-4â€‚â€‰Cr28-35Niâ€‚3â€”10Mo1.0-4.0N0.2-0.6Cumaximum 1.0Wmaximum 2.0Sâ€ƒmaximum 0.010Cemaximum 0.2and balance Fe together with normally occurring impurities and additives,wherein the ferritic content is 30-70 volume %, the alloy composition has a PRE-value higher than 42, and the PRE-value is at least 40 in both the ferritic and austenitic phases, where PRE=(% Cr)+3.3Ã—(% Mo)+16Ã—(% N).