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:
Jun. 15, 1999
Filed:
Apr. 30, 1997
Masao Shiga, Hitachi, JP;
Kishio Hidaka, Hitachiota, JP;
Norio Yamada, Hitachiota, JP;
Shigeyoshi Nakamura, Hitachinaka, JP;
Yutaka Fukui, Hitachi, JP;
Nobuo Shimizu, Hitachi, JP;
Ryoichi Kaneko, Hitachi, JP;
Yasuhiro Harada, Hitachinaka, JP;
Yasuo Watanabe, Hitachinaka, JP;
Toshio Fujita, Tokyo, JP;
Norio Morisada, Hitachinaka, JP;
Yasuhiko Tanaka, Muroran, JP;
Hitachi, Ltd., Tokyo, JP;
The Japane Steel Works, Ltd., Tokyo, JP;
Abstract
A heat resisting steel whose metal structure is entirely martensite phase produced by tempering after quenching. The steel comprises, by weight, 0.05 to 0.20% C, not more than 0.15% Si, not more than 1.5% Mn, not more than 1.0% Ni, 8.5 to 13.0% Cr, not more than 3.50% Mo, not more than 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, not more than 5.0% Co, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen and 0.00001 to 0.0002% hydrogen. The steel has preferably not more than 10 of the Cr equivalent. The steel has 10 kgf/mm.sup.2 or more of 100,000 hours creep rupture strength at 650.degree. C.