Process for producing austenitic ferrous alloys
AssigneeAllegheny Ludlum Industries, Inc.
InventorAlbert G. Hartline, III
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Abstract
There is disclosed a method for producing austenitic ferrous alloys containing from 21-45% manganese and from 10-30% chromium by exposing the alloys in solid form to nitrogen or nitrogen compounds at a temperature of at least 1700.degree.F for a time period sufficient to raise the nitrogen content of at least the surface of the alloy to at least 0.85%.
Claims3
An article of manufacture comprising a solid ferrous alloy consisting essentially of from about 21-45% manganese, from about 10-30% chromium, balance essentially iron, and having at its surface from about 0.85-3% nitrogen with a lesser nitrogen content in its interior than at its surface, said article having an austenitic surface and a two phase interior of austenitic and ferrite.
An article of manufacture comprising a solid ferrous alloy consisting essentially of from about 21-45% manganese, from about 10-30% chromium, balance essentially iron, and at its surface from about 0.85-3% nitrogen -- said article having an austenitic surface and a two-phase interior comprising austenite and ferrite.
Dependencies are inferred from the claim text.