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Yes , we use fittings on the 455 tube and have a source of Argon that purges during welding , parts are washed in kerosene and then washed with soap and water.

First of all thank you for the information , I have only been working for this Company for a few months and am not completely sure as to the history of the Tool in question , I don't know the exact procedure as to cleaning and handling before and after surgery and at this point we are looking...

Yes it is Carpanter's 455 SS , I belive the Co. that I sub contract for heat treats at H900 or 482 C for 1 Hour , and yes it is very much rust .

I am welding a handle made from 17-4 S.S. to a machined tube made from 455 S.S., parts are joined together via GTAW with 17-4 S.S. filler , units are cleaned heat treated and passavated , the completed part is a Orthopedic Surgery Tool, problem is that we are getting rust on the 455 tube bore ...