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:
May. 23, 2006
Filed:
Mar. 04, 2002
Masahiro Ohgami, Hikari, JP;
Tetsuya Magatani, Tokyo, JP;
Naoki Takasugi, Hikari, JP;
Osamu Takeda, Hikari, JP;
Masahiro Ohgami, Hikari, JP;
Tetsuya Magatani, Tokyo, JP;
Naoki Takasugi, Hikari, JP;
Osamu Takeda, Hikari, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides an electric resistance welded steel pipe for a hollow stabilizer excellent in workability, which steel pipe contains, in mass, 0.20 to 0.35% of C, 0.10 to 0.50% of Si, 0.30 to 1.00% of Mn, 0.01 to 0.10% of Al, 0.10 to 1.00% of Cr, 0.005 to 1.00% of Mo, 0.001 to 0.02% of Ti, 0.0005 to 0.0050% of B and 0.0010 to 0.0100% of N, satisfying the expression N/14<Ti/47.9, the balance consisting of Fe and unavoidable impurities and further has an ideal critical diameter (Di) being 1.0 (in) or more, an n-value in the axial direction of the steel pipe being 0.12 or more, a difference in hardness between the electric resistance welded seam portion and the base steel being Hv 30 or less, an average grain size of ferrite being 3 to 40 μm, an area percentage of the ferritic crystal grains having the aspect ratios of 0.5 to 3.0 being 90% or more in the entire ferrite phase, and having an average grain size of 20 μm or less in the second phase.