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:
Nov. 19, 2013
Filed:
Oct. 29, 2009
Koh-ichi Sugimoto, Nagano, JP;
Sho-hei Sato, Nagano, JP;
Teruhisa Takahashi, Sunto-gun, JP;
Goro Arai, Chino, JP;
Koh-ichi Sugimoto, Nagano, JP;
Sho-hei Sato, Nagano, JP;
Teruhisa Takahashi, Sunto-gun, JP;
Goro Arai, Chino, JP;
Usui Kokusai Sangyo Kaisha Limited, , JP;
Shinshu University, , JP;
Abstract
A high-strength steel machined product giving excellent hardenability has a metal microstructure with excellent balance of strength and toughness and high stability of retained austenite. The product is composed of an ultra-high low-alloy TRIP steel having a metal microstructure which contains an appropriate quantity of two or more of Cr, Mo, and Ni, and an appropriate quantity of one or more of Nb, Ti, and V, and having an appropriate value of carbon equivalent; the metal microstructure has a mother-phase structure composed mainly of lathy bainitic ferrite with a small amount of granular bainitic ferrite and polygonal ferrite, and has a secondary-phase structure composed of fine retained austenite and martensite.