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:
Nov. 09, 2021
Filed:
Aug. 08, 2017
Applicant:
Jfe Steel Corporation, Chiyoda-ku Tokyo, JP;
Inventors:
Hiroshi Okano, Tokyo, JP;
Shusaku Takagi, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 7/12 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/22 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01); F17C 1/00 (2006.01); F17C 13/00 (2006.01);
U.S. Cl.
CPC ...
C21D 8/105 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 7/12 (2013.01); C21D 9/085 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/44 (2013.01); C22C 38/58 (2013.01); F17C 1/00 (2013.01); F17C 13/00 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); F17C 2201/0104 (2013.01); F17C 2203/0604 (2013.01); F17C 2203/0639 (2013.01); F17C 2203/0648 (2013.01); F17C 2203/0663 (2013.01); F17C 2203/0675 (2013.01); F17C 2221/012 (2013.01); F17C 2223/0123 (2013.01); F17C 2223/036 (2013.01); F17C 2260/011 (2013.01); F17C 2270/0178 (2013.01); F17C 2270/0184 (2013.01); Y02E 60/32 (2013.01);
Abstract
A steel pipe or tube for pressure vessels having excellent quench crack resistance is provided. The steel pipe or tube for pressure vessels comprises: a specific chemical composition; and a metallic microstructure in which an average grain size of prior austenite grains is 500 μm or less, and an area fraction of microstructures other than ferrite is 50% or more.