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:
Jan. 09, 2018
Filed:
Dec. 06, 2012
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Kaori Kawano, Tokyo, JP;
Masahito Tasaka, Tokyo, JP;
Yoshiaki Nakazawa, Tokyo, JP;
Yasuaki Tanaka, Tokyo, JP;
Toshiro Tomida, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
The steel material for an impact absorbing member has a composition containing: by mass %, C: 0.05 to 0.18%, Mn: 1 to 3%, Si+Al: at least 0.5% and less than 2.5%, and N: 0.001 to 0.015%, and in some cases, Cr: at most 0.5%, Mo: at most 0.2%, Ti: at most 0.05%, Nb: at most 0.05%, V: at most 0.2%, and B: at most 0.002%, the remainder being Fe and impurities. The steel material structure contains at least 70% by area of bainite made up of a lath structure having an average interval of at most 1 mm and martensite, 5 to 30%, and satisfies Formulas (1) and (2): (1) 1.2 £ H/H£ 1.6, (2) 0.90 £ {(H/H)/(H/H) £ 1.3, where Hand Hrepresent average nano hardness in an initial state and after 10% tensile deformation of the martensite, and Hand Hrepresent that of bainite, respectively.