The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 1994
Filed:
Nov. 10, 1992
Hiroshi Okamoto, Minoo, JP;
Sumitomo Metal Indusries, Ltd., Osaka, JP;
Abstract
A duplex stainless steel has a chemical composition consisting essentially, on a weight basis, of: C: 0.03% or less, Si: 1.0% or less, Mn: 1.5% or less, P: 0.040% or less, S: 0.008% or less, sol.Al: 0.040% or less, Ni: 5.0-9.0%, Cr: 23.0-27.0%, Mo: 2.0-4.0%, N: 0.24-0.32%, W: greater than 1.5% and at most 5.0%, optionally at least one element selected from the group consisting of Cu: 0.2-2.0% and V: 0.05-1.5% and/or the group consisting of Ca: 0.02% or less, Mg: 0.02% or less, B: 0.02% or less, and one or more rare earth metals: 0.2% or less in total, and a balance of Fe and incidental impurities. The chemical composition has a value of at least 40 for PREW defined by the following formula (a):