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  1. nickt1960

    Cryogenic properties 304 versus 316

    I was wondering whether I could use 316 in lieu of 304 for low temp applications down to -196 C? I am trying to ban all 304 from our site for pitting resistance reasons but have been told we need 304 to achieve the required properties down at these temps. As far as I am aware 316 would be equal...
  2. nickt1960

    304 versus 316

    I don't have cryo experience and was wondering whether I could use 316 in lieu of 304 for low temp applications down to -196 C? I am trying to ban all 304 from our site for pitting resistance reasons but have been told we need 304 to achieve the required properties down at these temps. As far as...
  3. nickt1960

    Tea stained 316 balustrading

    I have had some s/s balustrading installed at home which has already started "tea staining" after just a couple of months. We are at least 10 km away from the coast, and hence insisted on using 316 s/s instead of 304. I am convinced that the fabricator has used 304 for some sections of the...
  4. nickt1960

    Co-60 source , a few non technical questions

    I too work for a multinational oil & gas company and you should tell your client that we normally prohibit using Co-60 for NDT work as the sensitivity is so low it is not worth the radiation risk to all and sundry. You should ask him whether he truly wants to find defects or does he just want to...
  5. nickt1960

    TMCP Steels - Rolling Direction

    Is it correct to say that with TMCP steels being rolled at various temperatures and in various directions(???) - that rolling direction is no longer an issue for cold forming of a TMCP plate?
  6. nickt1960

    Welding DSS to CS

    A contractor has approved a procedure using 309 SS to weld a A36 support shoe to the re-pad on S31803 DSS piping (repad is of the same piping material). We normally specify a DSS filler for welding DSS to CS. We are thinking that 309, being a high alloy austenitic stainless in dilution with...
  7. nickt1960

    PWHT of Inconel 625 cladding

    Thanks one and all!
  8. nickt1960

    PWHT of Inconel 625 cladding

    I should have added that the cladding process is mechanised TIG. Cheers
  9. nickt1960

    PWHT of Inconel 625 cladding

    I am reveiwing a contractor WPS for cladding F65 forging materials with 625 CRA in two layers up to 5 mm thick. Base material qualified is for 25.4 mm upwards. I note that the procedure is qualified with PWHT at 600 to 630 Celcius at one hour per inch - max 3.3 hours. I am uncomfortable with...
  10. nickt1960

    Validation of Charpy Impact

    May I ask which mill the valve came from, or as importantly was it manufactured and tested in Korea, China or Eastern Europe?
  11. nickt1960

    Flare tip material selection

    Our contractor, has passed on the following response from the flare manufacturers/designers. There is some H2S in the LP & tank farm flare streams (0.01 and 0.04 mol% respectively) which the vendor indicates will be a problem for the nickel alloys (800, 625) and as such they propose 310/316 for...
  12. nickt1960

    Heat treatment for C/S Line Pipe Induction Bends

    Yes, I didn't consdider it to be a temper treatment, that makes more sense than a stress relief. Translation problems! Many thanks
  13. nickt1960

    Heat treatment for C/S Line Pipe Induction Bends

    We are procuring line pipe and bends out of Japan. Material is Dnv-OS-F101 Grade 450 (X 65 equivalent), seamless 4" diameter x 7.4 mm wall thickness. The line pipe undergoes a Q & T during manufacture. The mother pipe that is then used for induction bending may or may not be put through post...
  14. nickt1960

    304 SS for Marine Applications

    Just to add weight to this discussion, in the offshore oil and gas industry the use of 304 for topsides applications is universally banned by all the majors. We not only require 316, but usually specify 316 with a guaranteed minimum 2.5% Mo content to ensure the required pitting resistance. Most...
  15. nickt1960

    Welding to Annealed Steel

    Gents, I would just like to add one more point. MT is the prefered NDT method to PT on castings due to the porous nature of castings versus other forms of manufactured steel. The other weakness with PT is that it can only detect defects that are physically open to the surface, wheras MT will...
  16. nickt1960

    Welding Duplex to 90/10 Cu/Ni

    I am wanting to make up a funnel using a duplex 31803 reducer welded to a 90/10 Cunifer fitting, hence no pressure or corrosion issues to worry about, I just need to be able to join them together. (I am offshore and have limited access to materials). I am think of using Inconel 625 as a filler...
  17. nickt1960

    FCAW vs SMAW of Pressure Vessel Nozzles.

    My experience with the oil and gas construction industry is that FCAW has long been seen to have suffered from lower impact properties than the other processes - to me that is the prime reason from excluding it from may specifications, especially self shielded. Whilst the consumables have now...
  18. nickt1960

    Citric Based Passivating Agent

    Thankyou one and all. I will follow up those suggestions
  19. nickt1960

    Citric Based Passivating Agent

    I am needing to clean and passivate some significant quantities of 316 s/s on an offshore platform in the Timor Sea. The usual HF and HNO3 based pickling pastes are considered too hazardous and environmentally unfriendly to use and wash overboard. I believe there may be a citric based product...
  20. nickt1960

    Waiver of PWHT with CTOD's

    Yes, now that I've looked again, I've found it in the Lincoln weldirectory. I am in fact going to try 8018-C1 which has better impact properties after PWHT (at lower temps). Thanks to all.

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