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:
Oct. 05, 1999
Filed:
Jul. 19, 1996
Applicant:
Inventors:
Moriaki Ono, Tokyo, JP;
Tsuyoshi Shiozaki, Tokyo, JP;
Masanori Ohmura, Tokyo, JP;
Yutaka Nagahama, Tokyo, JP;
Akio Sato, Tokyo, JP;
Kenichi Iwazaki, Tokyo, JP;
Yukio Sekine, Tokyo, JP;
Assignee:
NKK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
148333 ; 148909 ; 21912163 ;
Abstract
A laser-welded steel pipe includes: a steel pipe consisting essentially of C in an amount of 0.01 to 0.5 wt. %, Si in an amount of 1 wt. % or less, Mn in an amount of 0.05 to 2 wt. % and Cr in an amount of 6 wt. % or less; and a weld zone having a melted and solidified metal structure containing carbon and oxygen. The carbon content, �C wt. %!, and the oxygen content, �O wt. %!, in the melted and solidified metal structure satisfies the following equations: