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  1. foundrydude

    1.4742 material: how can we cast this material?

    There are always going to be folks trying to air melt aluminum bearing alloys - with very limited success. Most of the aluminum will oxidise during melting forming the Al2O3 scum that you see forming on the top. I would be surprised if the aluminum stays within the specification limits unless...
  2. foundrydude

    Haynes 230 alloy melting and pouring

    Hello All, Do any of the great ones out there have any experience with melting and pouring Haynes 230 alloy? Problem is the loss of Lanthanum, which is .005 - .05% concentration. Material is purchased from Haynes corp as machining bar, but loses most if not all of the contained Lanthanum when...
  3. foundrydude

    17-4PH Heat treatment specs

    As an investment casting house we provide 17-4 investment castings for aerospace applications. A customer source inspector ran into a contradiction that is causing a huge uproar. Statements made have included grounding of aircraft!!! Wonder if anyone else has run across this? Main question is...
  4. foundrydude

    A356 Al weld rod designation

    Does anyone know the correct AWS designation for welding the casting alloy A356? Casting specs are AMS-4218, ASTM B26, B108, AMS-A-21180? Thanks
  5. foundrydude

    hot straightening 17-4PH investment castings

    I am having a problem with 17-4 PH investment castings that are distorting during machining. My customer wants to machine in the fully HTR condition, Homo + Solution + H925. They are 6 inch diameter, thin-wall collars that are used to strap an A to A missile to a fighter wing. We hot size at...
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