Abstract
From the introduction of its first-generation, Duplex (austeno-ferritic) steel has seen a steady increase in popularity [1]. Recently, the production of highstrength, corrosion resistant super-duplex coil has been implemented in several applications. The case study we present in this paper concerns its use in a set of tubes of a heat exchanger affected by corrosion. The tubes material, S31803 Duplex stainless steel, is particularly suited to applications where corrosion is likely due to chlorides and/or sulphides being present. The heat exchanger operates in a chloride environment due to marine water on the inner side while the outer side is in contact with a hydrocarbon mixture rich in sulphur. It also has high resistance to general, pitting, crevice and erosion corrosion and to corrosion fatigue.
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