Austenitic, non-magnetic, stainless steel alloy and articles...

Details Austenitic, non-magnetic, stainless steel alloy and articles... Austenitic, non-magnetic, stainless steel alloy and articles...

C - Chemistry, Metallurgy

22

C

C22C 38/58 (2006.01) C22C 38/38 (2006.01)

Patent

CA 2079914

An austenitic, non-magnetic, stainless steel alloy is disclosed which, in the wrought condition, is essentially ferrite-free and has a relative magnetic permeability of less than about 1.02, a room temperature 0.2 % yield strength of at least about 100 ksi, and good resistance to stress corrosion cracking in chloride environments, Broad, intermediate, and preferred ranges are disclosed in the table (I), the balance being iron. The alloy is balanced to be essentially ferrite-free and to provide goad chloride SCC resistance in accordance with the following relationships: w/o N ~ w/o Mn + w/o Cr-21.9/20; w/o Ni + 2(w/o Cu) ~ w/o Cr + w/o Mo-14.6/1.5; and w/o Mn < w/o Cr + w/o Mo.

Alliage d'acier inoxydable austénitique non magnétique, à l'état corroyé, exempt de ferrite et présentant une perméabilité magnétique relative inférieure à environ 1,02, une limite conventionnelle d'élasticité à 0,2 % à température ambiante d'au moins environ 100ksi, ainsi qu'une bonne résistance à la fissure de corrosion sous contraintes dans des environnements de chlorure. Les plages de teneur grande, intermédiaire et préférée sont représentées dans le tableau (I), le solde étant du fer. L'alliage est équilibré pour être sensiblement exempt de ferrite et pour présenter une bonne résistance à la fissure de corrosion sous contraintes au chlorure avec les relations suivantes en % en poids: N Í Mn + Cr -21,9/20; Ni + 2(Cu) Í Cr + Mo-14,6/1,5; et Mn < Cr + Mo.

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