Title: Method of producing pitting resistant, hot-workable austenitic stainless steel

Abstract: An austenitic stainless steel alloy which has extremely good pitting resistance and at the same time has good hot-workability characteristics. The alloy contains, as essential constituents, chromium, nickel, molybdenum, calcium and cerium. In achieving the desirable characteristics of the invention, the molybdenum and chromium levels are important in determining pitting resistance; while recoveries of cerium and calcium in the final alloy are important in determining the hot-workability of the alloy, although cerium is the more important of the two. Sulfur levels are preferably maintained low, on the order of 0.006% or less. Also disclosed is a method for making an alloy of the type described above wherein the finishing temperature of hot-rolled strip is maintained around or above 1800.degree. F to reduce edge cracking and preferably is maintained at about 2000.degree. F.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Deverell, Harry E. (Natrona Heights, PA, US)

Application Number: 730400
Filing Date: 1976-10-07
Publication_date: 1977-08-23
Assignee: Allegheny Ludlum Industries, Inc. (Pittsburgh, PA)
Primary Class(es): 148/542 148/327, 148/442, 148/546
Other Classes:
US Patent Ref:

2553330	May, 1951	Post et al.	75/128.
3547625	Dec, 1970	Bieber et al.	75/128.
3729308	Apr, 1973	Eiselstein	75/128.
RE24243	Dec, 1956	Lohr	75/128.

Other Refs:
Primary Examiner: Steiner, Arthur J.
Assistant Examiner:
Attorney: Gioia; Vincent G., Dropkin; Robert F.