Super Duplex SS F53 S32750 vs F55 S32760 Super Duplex SS F53 S32750 vs F55 S32760 georgacus (Mechanical) (OP) 3 Mar 17 10:46 What is the difference between these two grades, if any? And what could be the reason for picking one over the other? As far as I could see, F55 has tungsten in its chemical composition. RE: Super Duplex SS F53 S32750 vs F55 S32760 metengr (Materials) 3 Mar 17 12:59 You might want to take a closer look between the two grades; http://pmfirst.com/materials/super-duplex/ RE: Super Duplex SS F53 S32750 vs F55 S32760 EdStainless (Materials) 3 Mar 17 13:53 They are two different ways of trying to reach the same level of corrosion resistance. There are a lot of papers on the heat treating and corrosion testing of these alloys. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube RE: Super Duplex SS F53 S32750 vs F55 S32760 JamesCKelly (Materials) 25 Apr 17 22:11 I think people tend to use them interchangeably, based on what is most available. If it is a new, and critical, application I personally would have greater faith in the validity of the Swedish-generated corrosion data for S32750.