Super duplex stainless steel (SDSS) UNS N08029 (Alloy 29) grade is a high nickel and chromium alloy steel with a minimum pitting resistance equivalent (PRE) number of about 42. This confers the alloy with improved resistance to corrosion in the presence of high chloride content and under extreme corrosive environments. Due to the superior pitting resistance and the excellent mechanical and weldability properties, alloy 29 is widely being adopted for application in hostile conditions in the oil and gas, desalination, petrochemical, and energy industries. Heat treatment is a fundamental and widely used approach to tailor the microstructure of steel to attained enhanced properties. Several investigations of the effect of heat treatment on corrosion behavior of other SDSS grades have been conducted. These studies revealed the role of heat treatment in portioning the microstructure between the phases and the influence on the corrosion behavior. However, no, or very limited literature can be found with a detailed investigation of the effect of heat treatment on the corrosion properties UNS N08029 grade SDSS. Thus, this study is aimed at evaluating the effect of different heat treatment cycles on the corrosion resistance of super duplex stainless steel UNS N08029 (Alloy 29) grade or any higher grade of SDSS under extreme and aggressive environments, such as high salinity and strong acidic environments. This study is aimed at investigating the relationship between the composition and microstructure distribution of SDSS UNS N08029 (Alloy 29) and the corresponding effect on the corrosion properties of the alloy. Furthermore, the corrosion behavior of the alloy in hostile conditions such as in the presence of aggressive species, contaminants, longer immersion duration, etc., will also be investigated.
|Effective start/end date
|1/09/21 → 1/08/22
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