Aug 8, 2015 #1 nickypaliwal Materials Aug 28, 2014 199 Is it recommended to use Super Austenitic (high in Cr and Ni but not Mo)Stainless Steel in place of DSS ? Assuming a system with high chlorides.
Is it recommended to use Super Austenitic (high in Cr and Ni but not Mo)Stainless Steel in place of DSS ? Assuming a system with high chlorides.
Aug 8, 2015 #2 metengr Materials Oct 2, 2003 15,478 You need more information - temperature, pH and chloride content. Once you have these process parameters, there is plenty of literature to review to make a choice. Upvote 0 Downvote
You need more information - temperature, pH and chloride content. Once you have these process parameters, there is plenty of literature to review to make a choice.
Aug 8, 2015 Thread starter #3 nickypaliwal Materials Aug 28, 2014 199 Assume a Chloride content of 140000ppm, pH2S of 9 mbar, Temp. = 70degC, pH = 5 Is PREN No. enough to make a choice ? Upvote 0 Downvote
Assume a Chloride content of 140000ppm, pH2S of 9 mbar, Temp. = 70degC, pH = 5 Is PREN No. enough to make a choice ?
Aug 8, 2015 #4 metengr Materials Oct 2, 2003 15,478 At this chloride level and pH you are into nickel-base, C-276 material. http://www.standard.no/pagefiles/1176/m-001.pdf Upvote 0 Downvote
At this chloride level and pH you are into nickel-base, C-276 material. http://www.standard.no/pagefiles/1176/m-001.pdf
Aug 9, 2015 #5 EdStainless Materials May 20, 2004 16,052 There is no DSS that will stand up under those conditions. Ni based Ni-Mo-Cr or Ni-Cr-Mo will be needed. Mo is how you make superaustinitic alloys, they are all 6 -7% Mo, it is critical to their corrosion resistance. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube Upvote 0 Downvote
There is no DSS that will stand up under those conditions. Ni based Ni-Mo-Cr or Ni-Cr-Mo will be needed. Mo is how you make superaustinitic alloys, they are all 6 -7% Mo, it is critical to their corrosion resistance. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube
Aug 11, 2015 #6 weldstan Materials Jun 24, 2011 2,753 Neither DSS nor super austenitic stainless steels are acceptable. See metengr & EdStainless. Upvote 0 Downvote
Aug 13, 2015 Thread starter #7 nickypaliwal Materials Aug 28, 2014 199 A182 F20, A182 F56 have high nickel but less than 6Mo. Are they not considered super austenitic ? Can these be used for DSS ? Upvote 0 Downvote
A182 F20, A182 F56 have high nickel but less than 6Mo. Are they not considered super austenitic ? Can these be used for DSS ?
Aug 14, 2015 #8 metengr Materials Oct 2, 2003 15,478 No. F20 is a super austenitic stainless steel, F56 is considered a duplex stainless steel. Upvote 0 Downvote
Aug 14, 2015 Thread starter #9 nickypaliwal Materials Aug 28, 2014 199 I believe, F56 has 31& Nickel and is listed under Austenitic Stainless Steel in A182 however I will recheck. but my question here is sir, whether F20 being super austenitic can be used for Duplex Stainless Steel as it has only 2-3% Mo. Upvote 0 Downvote
I believe, F56 has 31& Nickel and is listed under Austenitic Stainless Steel in A182 however I will recheck. but my question here is sir, whether F20 being super austenitic can be used for Duplex Stainless Steel as it has only 2-3% Mo.
Aug 14, 2015 #10 EdStainless Materials May 20, 2004 16,052 F20 is alloy 20, very good in sulfuric acid service, but not suitable for high Cl applications. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube Upvote 0 Downvote
F20 is alloy 20, very good in sulfuric acid service, but not suitable for high Cl applications. = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube
