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  1. ERob

    UHA-51(c) Thermal Treatment

    Thanks again, metengr. That is very helpful.
  2. ERob

    UHA-51(c) Thermal Treatment

    Thanks, metengr. Is there a code case or other reference you can point to that clarifies the term "thermal treatment" as used in UHA-51 (other than Endnote 82)? - ERob
  3. ERob

    UHA-51(c) Thermal Treatment

    A vessel shell is to be fabricated from 316H material and will operate at a temperature of approximately 1200 deg-F. Is the operating temperature of 1200 deg-F considered a "thermal treatment" per UHA-51(c)? If so, then impact testing of the base metal, HAZ and welding procedure qualification...
  4. ERob

    Postfabrication Heat Treatment of Cold-formed Head

    c8829, Yes, 316L is missing from Table UHA-44. I guess that means no postfabrication heat treatment is required by code, regardless of design temperature. Perhaps this is due to differences in susceptibility to stress corrosion cracking or precipitation of deleterious phases such as carbides or...
  5. ERob

    Postfabrication Heat Treatment of Cold-formed Head

    metengr, Thanks for your reply. Yes, I did review UHA-44. In the case I am dealing with, the design temperature of the head is 250-deg F. Therefore, the conditions of UHA-44(a)(1)(-b) do not apply (i.e. it is out of the range of temperatures requiring heat treatment per Table UHA-44). Since...
  6. ERob

    Postfabrication Heat Treatment of Cold-formed Head

    Please help me understand whether post-fabrication heat treatment is required for a cold-formed head fabricated from A240-304L material. I have paraphrased the code parts from the Section VIII, Div. 1 code below: 1) UF-31(a) states that all forgings shall be heat treated (after all foring is...
  7. ERob

    4140 and 4340 alloy steel

    rp & metengr, It sounds like quenching and tempering both 4140 and 4340 will increase toughness (as well as hardness) compared to the annealed condition. Is this due to retained austenite?, reduction in pearlite?, grain size (i.e. Hall-Petch)? or some other factor? I understand that martensite...
  8. ERob

    4140 and 4340 alloy steel

    'Toughness' is used in a couple of contexts in metallurgy and materials science. One context is 'fracture toughness' which is defined as the ability of a material to resist propagation of cracks that inevitably exist in a material, as described by theories of fracture mechanics. Toughness, in a...

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