Nickel Hastelloy W AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape AMS 5755 Hastelloy W Nickel N10004 AMS 5755 Bar Hastelloy W Nickel N10004 - Bar AMS 5755 Forging Hastelloy W Nickel N10004 - Forging AMS 5755 Ring Hastelloy W Nickel N10004 - Ring