I've got a quantity of tool steel marked `U S Ultra' and can't find it listed anywhere, can anyone help me with the specifications and recomended uses ?.
Nothing in Woldman's. There is an entire line of tool steels called Ultra, about a dozen different grades.
Get an analysis and harden a sample. See what it is.
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Corrosion never sleeps, but it can be managed.
I found it in Woldmans. It is basically a type H-11 tool steel, and is registered under U.N. Alloy Steel Corp. They are in Revere, MA 02151. Hope this helps.