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unknown plate

unknown plate

unknown plate

(OP)
in my work as a welder for a small contractor i am often demolishing or simply removing old and sometimes hard to identify metals. a thick(1-3/16 inch) plate of non ferrous-non magnetic metal bears the code"24s-t4 00 A-355..."It is at least as old as the simulated nuclear reactor it was built to support circa 1960.Can someone tell me its allows and weldable properties?

RE: unknown plate

Try posting this question over at the "Material Engineers" or "Alloy Engineering" forums, they might be able to help.
Good luck
Gary

RE: unknown plate

That sounds like the old designations for aluminum alloys. The modern designation would be 2024-T4.  The A-250 type number would be a procurement spec.  Check stinet.dtic.mil and search for QQ-A-250 and its slash sheets for specific forms and alloys.  QQ-A-250 is the current Fed Std for general aluminum requirements, likely also changed numbering since that item was built.

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