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. 17, 2012
Filed:
Jul. 30, 2007
Suguru Yoshida, Tokyo, JP;
Kita Hiroshi, Tokyo, JP;
Hirokazu Sugiyama, Tokyo, JP;
Yoshiyuki Watanabe, Tokyo, JP;
Yasushi Hasegawa, Tokyo, JP;
Suguru Yoshida, Tokyo, JP;
Kita Hiroshi, Tokyo, JP;
Hirokazu Sugiyama, Tokyo, JP;
Yoshiyuki Watanabe, Tokyo, JP;
Yasushi Hasegawa, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance containing, by mass %, C: 0.001% to 0.030%, Si: 0.05% to 0.50%, Mn: 0.4% to 2.0%, Nb: 0.03% to 0.50%, Ti: 0.005% to less than 0.040%, N: 0.0001% to less than 0.0050%, and Al: 0.005% to 0.030%, limiting P: 0.03% or, less and S: 0.02% or less, satisfying C—Nb/7.74≦0.005 and 2≦Ti/N≦12, and having a balance of Fe and unavoidable impurities and, further, a process for production of a fire resistant material comprising heating a steel slab comprised of this chemical composition to 1100 to 1350° C. and hot rolling it by a cumulative reduction rate at 1000° C. or less of 30% or more.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile