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. 19, 1991
Filed:
Oct. 03, 1988
Yoshinobu Honkura, Konanshi, JP;
Toru Matsuo, Tokaishi, JP;
Aichi Steel Works, Limited, Aichi, JP;
Abstract
A stainless steel fundamentally comprising, by weight, not more than 0.03% C, not more than 2.0% Si, not more than 5.0% Mn, 6-13% Ni, 16-21% Cr, 0.10-0.30% of N, and 0.02-0.25% Nb with the balance being Fe and inevitable impurity elements. The steel has a good corrosion resistance and a resistance to corrosion in seawater. The steel may further comprise at least one member of Mo and Cu each in an amount of not more than 0.4%, S, Se and Te each in an amount of not more than 0.08%, Bi, Pb, V, Ti, W, Ta, Hf, Zr and Al each in an amount of not more than 0.03% and P, Ca, Mg and rare earth elements each in an amount of not more than 0.01%. The steel has a recrystallized and worked double structure when subjected to a process comprising rough rolling an steel ingot at a temperature ranging from 1000.degree. to 1200.degree. C. at a working rate of not less than 50%, cooling at a cooling rate of not less then 4.degree. C./min, subsequently finish rolling at a temperature ranging from 800.degree. to 1000.degree. C. at a working rate of not less than 20%, and cooling at a cooling rate of not less than 4.degree. C./min.