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Recent content by rkg

  1. rkg

    Choice of SS material

    Let me put it this way: - if sensitization is not an issue, SS304 would be just fine. However, either use 304H or 304 with minimum carbon content of 0.04%. - If sensitization is indeed an issue (which means that you require high corrosion resistance as well), go for SS321.
  2. rkg

    Self reinforce nozzle (SA105) for -29¦C (-20¦F)

    It is possible to order SA 105N with impact test. Also, -29 deg. C is not a very low temperature and my experience says that impact will pass easily. This way, LF2 could be avoided.
  3. rkg

    Material Selection

    LTCS (which is also likely to be KCS only) and KCS can be used up to 427 deg. C, speaking in general. When using at temperatures higher than this, you have to be aware that graphitization may take place and flaking occurs. There is nothing called T-P (I presume you mean temperature-pressure)...
  4. rkg

    Looking for information on welding wire

    Metenger has a point. Do check if the electrode has deteriorated or something. My experience is E309-16 runs smoothly and generally has a better finish than E309-15, with good slag detachability.
  5. rkg

    Production Test Coupons

    The sample must be taken on the flange area. The maximum working takes place in the radial direction since the starting material can be presumed to be a hollow ring for practical purposes (actually, the starting material is likely to be a solid piece cut from a bar).
  6. rkg

    WHAT IS ASME PLATE EQUIVALENT TO DIN 15Mo3

    Exact equivalent of 15Mo3 is not possible to obtain. However, the nearest ASME equivalent for plates is SA204 (Gr.B is more commonly used). I would appreciate if you could tell me your application as well. It is because C-1/2 Mo(which is how you would express this material) is hardly being for...
  7. rkg

    PMI

    The choice of equipment depends on intended application. In case analysis of Carbon and Phosphorus is not an issue, you must seriously consider equipment working on X-Ray Flourescence. During the last five years, these equipments have gone a sea change. You no longer require Isotopes. The...
  8. rkg

    DIFFERENCE BETWEEN SEAMLESS AND WELDED PIPES

    I would like to make the following recommendation: - For sizes larger than 14", go for welded pipes anyway. You may choose A672 (for CS)and A358(for SS)which are fusion welded pipe specifications. These can be used in all applications where seamless pipes are used for lower sizes. -For sizes...
  9. rkg

    Question on welding stainless to carbon steel

    ER NiCr3 would do the job very well. However, in case a large number of joints are to be welded, economics must also be considered. ER 309Mo/ E309Mo is a good option.
  10. rkg

    stainless steel storage

    In addition to preventing physical contact with metals, care should be taken against likely sources of minerals coming in contact, in particular, chlorides. Mineral wools, insulation materials etc (especially when wet) could initiate corrosion. Many times grinding dust, people walking on...
  11. rkg

    A335-P11 - allowable stress -1960s ?

    I would like to say that A335-P1(C-0.5Mo) is no longer preferred/ used. Most users have barred carbon-molybdenum steels for all new constructions.
  12. rkg

    Thermal stabilization of SS347/ SS321

    Thermal stabilization of stabilized grades of aust. SS(SS347/SS321) and associated welds is increasingly being specified (which means heating to 815-900 deg. C followed by cooling in air). 1.What advantages does stabilization have? 2.Further, what could go wrong in previous installations where...
  13. rkg

    Restriction of Aluminium in Chromium Molybdenum Steels

    Could one of you guide me to some literature on the subject?
  14. rkg

    Restriction of Aluminium in Chromium Molybdenum Steels

    Stanweld,rd400guy, Thank you for your answers. I would like to know the importance of small amount of Nb in P91 vis-a-vis Vanadium, in terms of contribution to high temperature strength. In other words,what would happen to high temperature strength of this steel if Nb and N were not present.
  15. rkg

    Restriction of Aluminium in Chromium Molybdenum Steels

    Dear Stanweld, Thank you for your input. Could you clarify how restricting Al helps formation of these precipitates?
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