It's spelled 'Hastelloy', and a Google search on this word will yield a number of answers.
It's well worth looking at the Cole-Palmer materials compatibility database for examples of appropriate applications of these materials, if the specific application is not to be revealed here.
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UNS S31254, trade name 254SMO is an iron based austentic stainless steel with 6% Moly, .2% Nitrogen, and .75% Copper on top of the 18% Nickel and 20% chrome. It's corrosion performance in most applications is about as good as any iron based stainless can get, but Hastelloy C-276 has it beat, as does Inconel 625 and Inconel 725 or Alloy 625+ (which are heat treatable grades of 625 which are much much stronger.)
BUT all of the other alloys are Nickel alloys and are much more expensive.
But for us to suggest an alternative material, first we need to know the application and the environment and the strength level required.
Materials Question: Hastealloy C-276
Re: Materials Question: Hastealloy C-276
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