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51317-9771- A Comparison of Corrosion Resistant, High N Austenitic Stainless Steels

Picture for 51317-9771- A Comparison of Corrosion Resistant, High N Austenitic Stainless Steels
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A study of the corrosion resistance of multiple high Nitrogen, high Manganese austenitic stainless steels is presented, focusing on a newly developed alloy with increased pitting resistance. The alloys vary principally by the amount of Molybdenum, Nickel, Manganese, Chromium and Nitrogen.

Product Number: 51317-9771-SG
Author: Samuel J. Kernion / Thomas N. Werley
Publication Date: 2017
Industry: Materials Selection and Design
$20.00
$20.00
$20.00

A study of the corrosion resistance of multiple high N, high Mn austenitic stainless steels is presented, focusing on a newly developed alloy with increased pitting resistance. The alloys vary principally by the amount of Mo, Ni, Mn, Cr and N. High Mn and Cr content increase the solubility of N, and the N acts to stabilize the austenitic matrix, improve pitting resistance, and increase strength. The alloys were tested in the work hardened condition, with yield strengths ranging from 850-1020 MPa. Resistance to pitting was measured by multiple methods. Electrochemical testing was used to determine the pitting potential and critical pitting temperature (ASTM standard G150) in an 8% chloride solution. Ferric chloride pitting tests (ASTM standard G48) were run to compare pitting mass loss and to confirm the critical pitting temperature. Results generally followed expected trends with the new alloy demonstrating improved pitting resistance as predicted by the PREN. Susceptibility to intergranular attack and stress corrosion cracking were also tested, with less definitive results. These alloys are typically used as components in non-magnetic drilling equipment and should be considered for applications where a combination of corrosion resistance and high strength are required.

Key words: conference papers, 2017 conference papers, Austenitic stainless steels, PREN, high nitrogen, critical pitting temperature, stress corrosion cracking

A study of the corrosion resistance of multiple high N, high Mn austenitic stainless steels is presented, focusing on a newly developed alloy with increased pitting resistance. The alloys vary principally by the amount of Mo, Ni, Mn, Cr and N. High Mn and Cr content increase the solubility of N, and the N acts to stabilize the austenitic matrix, improve pitting resistance, and increase strength. The alloys were tested in the work hardened condition, with yield strengths ranging from 850-1020 MPa. Resistance to pitting was measured by multiple methods. Electrochemical testing was used to determine the pitting potential and critical pitting temperature (ASTM standard G150) in an 8% chloride solution. Ferric chloride pitting tests (ASTM standard G48) were run to compare pitting mass loss and to confirm the critical pitting temperature. Results generally followed expected trends with the new alloy demonstrating improved pitting resistance as predicted by the PREN. Susceptibility to intergranular attack and stress corrosion cracking were also tested, with less definitive results. These alloys are typically used as components in non-magnetic drilling equipment and should be considered for applications where a combination of corrosion resistance and high strength are required.

Key words: conference papers, 2017 conference papers, Austenitic stainless steels, PREN, high nitrogen, critical pitting temperature, stress corrosion cracking

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