Re: incoloy material standard

i dont think so. one has just to read the development of the incoloy family of alloys and the acceptance of the ASME and ASTM of this excellent alloy to prove my point.

i have purchase a number of exotic metal that does not even have an equivalent astm/asme designation and used it succesfully. the key here is the close ties (re: alliance) the needed to be establish/develop with the alloy mfr/developer.

• In PipingDesign@y..., Christopher Wright <chrisw@s...> wrote:
  > >my guess is thatsince these are proprietary alloys, the equiv
  > >ASTM spec may have less restrive reqt that those imposed by the
  > >alloy developers.
  > Bad guess. ASTM specs are invariably more restrictive, insofar as
  they
  > always provide for minimum mechanical properties and specific
  processing
  > requirements so those minimums are met. Suppliers rarely guarantee
  much
  > of anything, especially mechanical properties. And remember that
  > different product forms may have differing chemistry and
  mechanical
  > properties, which are also addressed by ASTM specs. If you're
  doing
  > piping work, ASME piping codes require ASTM/ASME specs anyway.
  >
  > And never _ever_ order a material by trade name. First, you'll
  lock
  > yourself into a single supplier when others may make the same
  stuff under
  > a different trade name. Second what you'll get will be
  > chemistry-only--everything else will be whatever the supplier has
  on the
  > shelf. I've been burned in this situation a number of times, most
  notably
  > when someone ordered some U. S. Steel T-1 high strength QT steel.
  We got
  > USS T-1 all right, but it just happened to be the high hardness
  (low
  > toughness) T-1 typically used for bulldozer blades. By the time we
  found
  > out it was already part of a fracture critical structure and the
  shit
  > really hit the fan. US Steel had no responsibiity even for
  replacing the
  > material because they supplied exactly what we asked for. It was a
  very
  > expensive mistake. Use the proper material specification for Code
  work.
  >
  > Christopher Wright P.E. |"They couldn't hit an elephant at
  > chrisw@s... | this distance" (last words of Gen.
  > ___________________________| John Sedgwick, Spotsylvania 1864)
  > http://www.skypoint.com/~chrisw