CORROSION 2016

Corrosion 2016Rolled Alloys participated with RAMS personnel Glenn Byrne, Justinn General and Paul Whitcraft.  Some highlights of the week included:

To start off the week, NACE released the final report on an extensive study designed to estimate the annual global cost of corrosion.  The global cost of corrosion is estimated to be US$2.5 trillion, which is equivalent to 3.4% of the global GDP (2013). By using available corrosion control practices, it is estimated that savings of between 15 and 35% of the cost of corrosion could be realized; i.e., between US$375 and $875 billion annually on a global basis. These costs typically do not include individual safety or environmental consequences. Through near misses, incidents, forced shutdowns (outages), accidents, etc., several industries have come to realize that lack of corrosion management can be very costly and that, through proper corrosion management, significant cost savings can be achieved over the lifetime of an asset.  More on this topic will be presented here in the future.

Steve Kroft (60 Minutes) gave a keynote speech touching on the significance of the media in bringing attention to the need to address corrosion of the infrastructure.  Mr. Kroft informed us that his father was a metallurgist.

Dr. Glenn Byrne presented two papers.  In the Advances in Materials for O&G Symposium the paper was “HISCC Resistance and Improvement Methods for Duplex and Super Duplex Stainless Steels” (Paper 6981).  In the Symposium on recent Experiences with Stainless Steels he presented “Corrosion Management of Assets Constructed in Super Duplex Stainless Steels” (#6982).  Both of these papers focused on the use of ZERON 100.  Glenn was also a co-author on another paper presented in this session by Roger Francis, “The Detection of Alpha Prime in Duplex Stainless Steels” (#7025).

 

An update on the activities of the ASTM Nickel and Cobalt alloy subcommittee was presented by Paul Whitcraft in TEG116X (Austenitic Stainless and Nickel Alloys).  The ASTM subcommittee has jurisdiction over 104 standards and is following the transfer of the N08xxx alloys from the nickel committee to the stainless committees.  (See Metallurgical Minutes April 6, 2015).

 

Dr. Roger Francis and Dr. Steve Clarke recently published a book through NACE International called "The Selection of Materials for Mineral Processing Operations".  This book was written to introduce mining engineers to the concepts of materials selection with particular attention to high pressure acid leaching and downstream processing.  It relates many examples of real mining industry material performance in actual operational experience. Catastrophic case histories are described, but are counterbalanced with successful and appropriate material selection strategies.

 

Norwegian researchers published data to support the beneficial role of tungsten in the overall resistance of super duplex stainless steel to corrosion attack in seawater.  In their paper "The Effect of Tungsten on Pitting and Crevice Corrosion Resistance of Type 25% Cr Super Duplex Stainless Steel" (#7308), Professor Roy Johnsen of the Norwegian University of Science and Technology and his co-authors, show tungsten at the 0.5% level and higher to exhibit higher levels of pitting and crevice corrosion resistance than 25% Cr super duplex grades that do not contain tungsten. They also show that inclusion of a factor for tungsten in the PREN equation (PRENW as per ISO15156/MR0175) makes this parameter a more accurate measure of the corrosion resistance of these grades in seawater.  RA ZERON 100 stainless (UNS S32760) contains a tungsten addition of 0.5 – 1.0% resulting in a minimum PRENW of 41.3. The 25% Cr super duplex grades like "2507" (UNS S32750) do not contain a tungsten addition and do not carry this additional benefit in seawater service.

Paul Whitcraft, Chairman of MTI, presented two scholarship awards on behalf of MTI at the NACE Foundation dinner. Will Hoskins (University of Tennessee-Knoxville) and Mary Teague (University of Akron) each receive a $5000 award.