Title: Process for producing austenitic ferrous alloys

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%.

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Inventors: Hartline, III, Albert G. (Albany, NY, US)

Application Number: 478482
Filing Date: 1974-06-12
Publication_date: 1976-03-09
Assignee: Allegheny Ludlum Industries, Inc. (Pittsburgh, PA)
Primary Class(es): 148/317 148/318
Other Classes:
US Patent Ref:

1207848	Dec, 1916	Bray	148/16.
2745740	May, 1956	Jackson et al.	75/126.
2778731	Jan, 1957	Carney	75/126.
2862812	Dec, 1958	Dulis et al.	75/126.
2909425	Oct, 1959	Hsiao et al.	75/126.
2940880	Jun, 1960	Stanley et al.	148/16.
3854938	Dec, 1974	Baybrook et al.	75/128.

Other Refs: 892,667

Mar, 1962	UK

Primary Examiner: Lovell, C.
Assistant Examiner:
Attorney: Gioia; Vincent G., Dropkin; Robert F.