Large warm worked, alloy article

摘要

A large, austenitic, non-magnetic, stainless steel, alloy article which has been significantly warm worked between about 1500 DEG F. and 1650 DEG F. but not subsequently annealed, which has a 0.2% yield strength of at least about 90 ksi, and which, when formed into a U-bend, does not undergo stress corrosion cracking within about 700 hours in boiling saturated aqueous sodium chloride containing 2 weight percent (w/o) ammonium bisulfite. The alloy of the article consists essentially of about: -Elements w/o -C 0.1 Max. -Mn 1-11 -Si 0.6 Max. -Cr 18-23 -Ni 14-25 -Mo 2.5-6.5 -Cu 2 Max. -B .01 Max. -N 0.15 Min. - -C + N >/= <IMAGE> - and the balance is essentially iron. a preferred alloy for this article contains about: -Elements w/o -C .02 Max. -Mn 3.0-9.0 -Si 0.5 Max. -Cr 18-23 -Ni 15-22 -Mo 2.5-6.5 -N 0.20 Min. -3Mo + Cr >/= 29.5 -