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:
Dec. 10, 2019
Filed:
Oct. 27, 2011
Ryuichi Honma, Tokyo, JP;
Ryuji Uemori, Tokyo, JP;
Tadashi Ishikawa, Tokyo, JP;
Akihiko Kojima, Tokyo, JP;
Manabu Hoshino, Tokyo, JP;
Ryuichi Honma, Tokyo, JP;
Ryuji Uemori, Tokyo, JP;
Tadashi Ishikawa, Tokyo, JP;
Akihiko Kojima, Tokyo, JP;
Manabu Hoshino, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A steel for electron-beam welding according to the present invention includes at least C: 0.02% to 0.10%, Si: 0.03% to 0.30%, Mn: 1.5% to 2.5%, Ti: 0.005% to 0.015%, N: 0.0020% to 0.0060%, and O: 0.0010% to 0.0035%, further includes S: limited to 0.010% or less, P: limited to 0.015% or less, and Al: limited to 0.004% or less, with a balance including iron and inevitable impurities. An index value CeEBB obtained by substituting composition of the steel into following Formula 1 falls in the range of 0.42 to 0.65%, the number of oxide having an equivalent circle diameter of 1.0 μm or more is 20 pieces/mmor less at a thickness center portion in cross section along the thickness direction of the steel, and the number of oxide containing Ti of 10% or more and having an equivalent circle diameter of not less than 0.05 μm or more and less than 0.5 μm falls in the range of 1×10to 1×10pieces/mmat the thickness center portion.CeEBB=C+¼Mn+ 1/15Cu+ 1/15Ni+⅕Cr+⅕Mo+⅕V  (Formula 1)