Stainless Steel 321 Stainless Steel 321 boo1 (Mechanical) (OP) 11 Jun 15 20:21 Does anyone have experience with 321 in the marine environment for tubing? RE: Stainless Steel 321 Jason8zhu (Marine/Ocean) 25 Jun 15 06:47 it is an austenitic stainless steel with yield point of 205MPa.note it is susceptible to SSC. RE: Stainless Steel 321 EdStainless (Materials) 27 Jun 15 01:18 It does not have as good of corrosion resistance as 304, it is totally unsuited for use anywhere near a marine location. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube RE: Stainless Steel 321 boo1 (Mechanical) (OP) 1 Jul 15 15:02 Contractor wants to substitute our 316 tubing with 321, because availability. RE: Stainless Steel 321 Jason8zhu (Marine/Ocean) 7 Jul 15 22:55 if u are their customer, feel free to reject this proposal since this steel is low in corrosion resistance. if the contractor indists on use this steel, i think they need to prepare a corrosion assessment and detail design analysis on the material to Sulfide Stress Cracking and Hydrogen Induced Stress Cracking. RE: Stainless Steel 321 dicer (Automotive) 10 Jul 15 09:16 321 not good for marine apps? Years ago I remember machining a lot of it for a very specific marine application and it was for above and below water applications. Very large company, so they must have known what they were doing, as they did thousands of tests on materials on a constant basis. RE: Stainless Steel 321 Jason8zhu (Marine/Ocean) 16 Jul 15 04:52 Hi, Dicer, As far as my understanding, steel 321 is suspectible to Chloride and H2S corrosion. It thus not suitable using in seawater and oil gas structure within H2S. however, for the application in river and lake, i think it is OK.