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51313-02228-6Mo Superaustenitic SS with Low Sigma Solvus Temperature and High Resistance to Localized Corrosion

Product Number: 51313-02228-SG
ISBN: 02228 2013 CP
Author: Rainer Behrens
Publication Date: 2013
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This work is presenting a new developed high corrosion resistant super-austenitic stainless steel with applications in the chemical process industry. High levels of Chromium and Molybdenum are giving resistance to general forms of corrosion and localised corrosion in chloride containing media. The pitting resistance equivalent numbering calculated by the weighted sum of Chromium Molybdenum and Nitrogen is resulting in a PREN of 54. A high Nickel content supported by alloying with Nitrogen offers an improvement in the thermal stability compared to other alloys known of this family. The high Nickel content combined with Nitrogen is leading to a beneficial low sigma solvus temperature. The low sigma solvus temperature is advantageous in the heat treatment processing of this alloy. Corrosion rates in mineral acids and corrosion data in ASTM G 48 Method C for critical pitting temperature and other lab measurements are presented as well as phase calculations for sigma phase formation compared to practical experiences.



Keywords: CPI super austenitic stainless steel sigma phase corrosion corrosion resistant alloy pitting laboratory testing nitrogen UNS N08031 phase calculation

This work is presenting a new developed high corrosion resistant super-austenitic stainless steel with applications in the chemical process industry. High levels of Chromium and Molybdenum are giving resistance to general forms of corrosion and localised corrosion in chloride containing media. The pitting resistance equivalent numbering calculated by the weighted sum of Chromium Molybdenum and Nitrogen is resulting in a PREN of 54. A high Nickel content supported by alloying with Nitrogen offers an improvement in the thermal stability compared to other alloys known of this family. The high Nickel content combined with Nitrogen is leading to a beneficial low sigma solvus temperature. The low sigma solvus temperature is advantageous in the heat treatment processing of this alloy. Corrosion rates in mineral acids and corrosion data in ASTM G 48 Method C for critical pitting temperature and other lab measurements are presented as well as phase calculations for sigma phase formation compared to practical experiences.



Keywords: CPI super austenitic stainless steel sigma phase corrosion corrosion resistant alloy pitting laboratory testing nitrogen UNS N08031 phase calculation

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