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Influence of microstructure on the corrosion resistance of hyperduplex stainless steel

✍ Scribed by S. S. M. Tavares; J. M. Pardal; E. Ponzio; A. Loureiro; J. A. de Souza

Publisher: John Wiley and Sons
Year: 2009
Tongue: German
Weight: 600 KB
Volume: 61
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200905386

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Hyperduplex UNS S32707 is a newly developed austenitic–ferritic stainless steel. The steel contains about 27%Cr, 7%Ni, 4.5%Mo, and 0.4%N, which results in a pitting resistance equivalent factor (PRE) equal to 49. In this study, the pitting corrosion resistance of this new grade of stainless steel was investigated by varying the microstructure using different thermal processes. The critical pitting temperature measurement and cyclic polarization tests confirm the high corrosion resistance of the hyperduplex steel in the solution treated condition. However, deleterious phases form easily during thermal processing and cause a drastic decrease in the corrosion resistance.

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