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To evaluate the effect of annealing temperature on microstructure, hardness, and pitting corrosion of an UNS S32304 lean duplex stainless steel, using a light optical microscope and cyclic potentiodynamic polarization electrochemical measurements.
Duplex stainless steels are characterized by a biphasic austenitic-ferritic microstructure, and have good corrosion resistance, toughness and high mechanical strength. Lean duplex grades have been developed to minimize cost fluctuations by reducing expensive elements like Ni and Mo without deteriorating their corrosion and mechanical properties. The aim of this paper is to evaluate the effect of annealing temperature on microstructure, hardness, and pitting corrosion of an UNS S32304 lean duplex stainless steel. Microstructural investigations were carried out using a light optical microscope and the cyclic potentiodynamic polarization electrochemical measurements. Annealing temperature affects the structure and composition of the passive films on the surface of duplex stainless steel.
Key words: pitting corrosion, duplex stainless steel, annealing.
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Alloy 699 XA is a new alloy, which was developed for application in petrochemical industry under metal dusting conditions at high pressure. It contains 30% chromium and 2% aluminum.
The aim of this paper is to find a correlation between nitride content/distribution and properties of two of the largely adopted Duplex Stainless Steel (DSS), UNS* S32205 and UNS S32750. *Unified Numbering System