Re: Re: incoloy material standard

>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@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)