Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1987-02-26
1989-04-18
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 57, 420 58, 148327, C22C 3858
Patent
active
048225568
ABSTRACT:
A nonmagnetic austenitic stainless steel and articles such as drill collars or boat shafts fabricated therefrom, the steel having a 0.2% yield strength of at least 100 ksi (689 N/mm.sup.2), improved resistance to intergranular stress corrosion, good ductility, good corrosion resistance and low magnetic permeability, and consisting essentially of, in weight percent, from greater than 0.05% to about 0.10% carbon, greater than 14% to about 18% manganese, about 15% to about 20% chromium, about 1% to about 3.5% nickel, about 0.3% to about 0.55% nitrogen, about 0.10% to about 0.5% vanadium, about 1.0% maximum copper, about 1.0% maximum molybdenum, about 1.0% maximum silicon, about 0.04% maximum phosphorous, about 0.03% maximum sulfur, and balance essentially iron.
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Cordea James N.
Jasper Joseph C.
Sheth Harshad V.
Baltimore Specialty Steels Corporation
Bunyard R. J.
Fillnow L. A.
Johnson R. H.
Yee Deborah
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