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:
Apr. 17, 2012
Filed:
Mar. 12, 2004
Hisashi Amaya, Kyoto, JP;
Kunio Kondo, Sanda, JP;
Masakatsu Ueda, Wakayama, JP;
Keiichi Nakamura, Wakayama, JP;
Takahiro Kushida, Amagasaki, JP;
Kazuyo Kushida, Legal Representative, Amagasaki, JP;
Hisashi Amaya, Kyoto, JP;
Kunio Kondo, Sanda, JP;
Masakatsu Ueda, Wakayama, JP;
Keiichi Nakamura, Wakayama, JP;
Takahiro Kushida, Amagasaki, JP;
Kazuyo Kushida, legal representative, Amagasaki, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
A martensitic stainless steel comprising C: 0.01-0.10%, Si: 0.05-1.0%, Mn: 0.05-1.5%, P: not more than 0.03%, S: not more than 0.01%, Cr: 9-15%, Ni: 0.1-4.5%, Al: not more than 0.05% and N: not more than 0.1% in mass %, and further comprising at least one of Cu: 0.05-5% and Mo: 0.05-5%, the residual being Fe and impurities, is provided, wherein the contents of Cu and Mo satisfy the following formula (a) or (b),0.2%≦Mo+Cu/4≦5%  (a)0.55%≦Mo+Cu/4≦5%  (b)and wherein the hardness is 30-45 in HRC and the carbide amount in grain boundaries of the prior austenite is not more than 0.5 volume %. The marensitic stainless steel has excellent properties regarding the sulfide stress cracking resistance, the resistance to corrosive wear and the localized corrosion.