https://www.nickelalloytubes.com/products/incoloy-800h-n08810-nickel-alloy-pipe-tube.html Incoloy 800H pipe is a slightly modified version of Incoloy 800 with the 800H grade possessing higher creep and rupture strength. The modification of incoloy alloy 800H pipe is possible because of the closely controlled carbon content and modified heat treatment.All Rights Reserved