Oil and Gas
Localised corrosion results from breakdown of the steel’s passive surface layer and manifests itself as crevice or pitting attack. Resistance is improved with additions of Cr, Mo and N2. Damage is more likely with increasing salinity, pH and temperature.
Pitting Resistance Equivalent (PRE) is a mathematically calculated measure of resistance to pitting and crevice corrosion given by the formula PREN = %Cr + 3.3% Mo + 16% N2.
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1, 2 and 3 illustrate the superiority of VISTAR® in seawater, formation
and oil field produced waters. VISTAR® with a typical PRE value of 47 outperforms traditional Austenitic and Duplex Stainless Steels and will outperform some of the less alloyed nickel alloys in chlorinated and acid oxidising conditions. |
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