The article, Finding the right stainless steel for seawater and topside applications: Part two of two, written by Marcelo Senatore, Regional Technical Marketing Manager at Sandvik Materials Technology, focuses on Sandviks super-duplex (austenitic-ferric) stainless steel, Sandvik SAF 2507®, UNS S32750, which was introduced to the market in 1989. Originally, the material was developed for seawater cooling, as it has a minimum pitting resistant equivalent (PRE) of 42.5.
In part two of the article, Senatore discusses various case studies that have used SAF 2507. Offshore operations often have the widespread problem of localized corrosion in 316 stainless steel instruments and chemical injection tubing, used in a marine environment. To identify the best solutions for this problem, field experience was studied, and samples exposed to the marine environment were used to evaluate possible alternative materials, Senatore writes. For one year, eight alloys (316L, 317LMN, Super Duplex, 254SMO, Alloy 825, Alloy 625, Alloy 400 and UNS C69100) were exposed to the marine environment onboard two offshore platforms, one located on in the Gulf of Mexico and the other in Trinidad.
For the full article, please email Catarina Muia at c.muia@kci-world.com for the article PDF.