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  1. EuroWeld

    Duplex and Intermetallics

    To all, Thanks for all answers! When we talk about corrosion testing do we mean a ferric chloride corrosion test like ASTM A923 method C? Does this also mean that method C of ASTM A923 is more usefull than method B for detecting intermetallics? I am curious about the fraction that is still...
  2. EuroWeld

    Duplex and Intermetallics

    Hello all, Duplex and super duplex grades are prone for the forming of intermetallic phases that lower corrosion resistance and mechanical properties like impact strength. These phases grow in a temperature range between 950-600 degC during heat treatment and/or welding. After metal fabrication...
  3. EuroWeld

    Duplex and NACE MR 0175

    Hello all, Currently we are designing a few hp heat exchangers including NACE MR 0175 requirements. Materials of construction will be S31803/S32205 DSS, material thickness up to 100mm. Most of the requirements that are included are understood and can be achieved but the maximal hardness...
  4. EuroWeld

    Norsok M650 rev 4 QTR ranges of qualification

    A Norsok M650 qualification test record holds a scope (qualification of process) and the tested and qualified thickness and weight. In some cases a range of qualifcation is also given but in most cases this range is missing. Can anybody inform me about the criteria that is applicable to...
  5. EuroWeld

    Duplex u-bended tubes

    @XL83NL: Thank you for informing me about the API TR938-C, this is exactly the information were I was looking for. @Edstainless: Tubes are filled with Argon during the heat treatment after bending and the outside of the tubes are pickled and passivated followed by a neutralizing and rinsing...
  6. EuroWeld

    Duplex u-bended tubes

    Thank you all for given information. @Metengr: If you perform a locally re-solution annealing of the bend area how can you secure that the transfer zone is free of intermetallic phases due to uncontrolled/slower cooling? I assume that this zone is also very sensitive for SCC during service? Is...
  7. EuroWeld

    Duplex u-bended tubes

    Hello all, My question relates to the different methods used for bending and heat treating duplex stainless steel (heat exchanger) u-tubes. To avoid metallurgical problems with the duplex grade material it is prefered to bend the tubes cold. In some cases specifications prescribe solution...
  8. EuroWeld

    ASME VIII div 1-U-stamp and Super Duplex S32760 material

    Marty007, Thank you for your effort. We discussed this CC with our client and AAI, both agreed to proceed with this alternative grade. Just for interest: Why does it take so long to incorporate this CC from 1999? Euroweld
  9. EuroWeld

    ASME VIII div 1-U-stamp and Super Duplex S32760 material

    Hello Marty, I kindly thank you for your help, this will help us to proceed with this alternative. I checked this CC2245 and it includes the use of this material up to 600 F. In our case this is enough. Thanks allot, Euroweld
  10. EuroWeld

    ASME VIII div 1-U-stamp and Super Duplex S32760 material

    Hello all, Recently we booked an order for fabricating a super duplex heat exchanger. Design code ASME VIII div 1 including U-stamp. During the procurement stage we are facing some difficulties buying the correct S32750-F53 seamless tubes. The only option we have at this moment is an...
  11. EuroWeld

    Main reason of PWHT by carbon steels.

    Metengr I am not trying to. Just for my interest. Wanting to get a good view on when to perform or when not! Also I want to sort out the invluence of the heat treatment towards stress corrosion cracking. For this view I need a complete situation. I hope this is not against any rule? Metalguy...
  12. EuroWeld

    Main reason of PWHT by carbon steels.

    Hello Kingnero, Kindly thank you for your reply. I am aware of the carbon equivalent (Cev) and its relation to the maximum hardness of the material. Next to lowering the resedual tensile stress we can make a list of the following factors/reasons to apply PWHT: 1. Diffusion of hydrogen from the...
  13. EuroWeld

    Main reason of PWHT by carbon steels.

    Hello metalguy, Thanks for your reply. I mean unalloyed carbon steel such as a-516. Do you know if there are more reasons to apply? Thanks
  14. EuroWeld

    Main reason of PWHT by carbon steels.

    Good day, I have some questions that relates to whether or not to apply post weld heat treatment on carbon steel headers. This question relates to the fabrication of pressure equipment. Can somebody give me the main reasons for applying pwht by for example an carbon steel header of an air...
  15. EuroWeld

    Switzerland and PED

    @rjvanhofwegen Switzerland is a so called associate country , take a look at the following websites: http://ec.europa.eu/enterprise/sectors/pressure-and-gas/pressure-equipment/memberstates_en.htm http://www.seco.admin.ch/themen/00385/00440/04191/index.html?lang=de The following text can be...
  16. EuroWeld

    API 661 para 9.2.1. (pwht)

    Dear All, As pressure equipment fabricator we designed a new type of header for air cooled coolers that contains almost no welds. Instead of welding plates together we have a design that consists our of a forged block. The only welding there is for the nozzles and in some cases an endplate. In...
  17. EuroWeld

    Tubesheet overlay ASME stamped and U-2 report

    Hello All, Recently we subcontracted the manufacturing (forging, machining) and overlay welding of some tubesheets under ASME VIII div 1 including ASME U stamp. This supplier holds a ASME U stamp certification but subcontracted the overlay welding to a welding company also with U stamp...
  18. EuroWeld

    Rolling of Titanium Tube-Tubesheet connection Air cooled Cooler

    Metengr, Thanks, that is helpful. Information is practical, I will read it carefully. Do you have some personal expierence with this topic? Thanks Euroweld
  19. EuroWeld

    Rolling of Titanium Tube-Tubesheet connection Air cooled Cooler

    Dear All, Recently we received an order of an Air Cooled Cooler that is fabricated completely of Titanium. This bundle is a replacement of an exact copy which was built several years ago by another fabricator. The tubesheet is 25mm thick and the tubes haves a wallthickness of appr. 2,11mm, Dia...
  20. EuroWeld

    PED 97/23/EC Certification for suppliers outside EEC

    Ulyssess, is it not a little bit strange that purchaser can perform the inspection to obtain a 3.2 certificate? This manner is not that independent! Is this commonly used? I will investigate deeper to find out how and why these companies haves PED certifications by non Nando NoBo"s! Thanks...

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