This paper discusses merits of a high chromium ferritic stainless steel with extremely low levels of carbon and nitrogen. Data are shown on effects of carbon, nitrogen, and other impurity elements on alloy corrosion properties, mechanical properties, mill processing, and fabricability. Properties of Type XM-27, a 26Cr-1Mo high purity ferritic made by electron-beam refining, are discussed for various product forms. Weldability and fabrication characteristics are reviewed with emphasis on heat exchangers and pressure vessels. Use of Type XM-27 in chemical, petroleum, and fertilizer processing equipment is described. Service performance results, in some cases showing 24-month data, are presented.
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