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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.:

US 11821051 B1

PDFFull Text
Date of Patent:
Nov. 21, 2023

Filed:

Dec. 10, 2019

Apparatus line for manufacturing seamless steel pipe and tube and method of manufacturing duplex seamless stainless steel pipe

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Shunsuke Sasaki, Handa, JP;

Tatsuro Katsumura, Handa, JP;

Hiroki Ushida, Handa, JP;

Yasushi Kato, Handa, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Edward T Tolan

Int. Cl.
CPC ...
B21B 17/04 (2006.01); C21D 9/08 (2006.01); B21B 3/02 (2006.01); B21B 17/08 (2006.01); B21B 19/04 (2006.01); C22C 38/00 (2006.01); C22C 38/58 (2006.01); B21B 45/02 (2006.01); C21D 8/10 (2006.01); B21B 45/00 (2006.01); C21D 6/00 (2006.01); C22C 30/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C21D 9/085 (2013.01); B21B 3/02 (2013.01); B21B 17/08 (2013.01); B21B 19/04 (2013.01); B21B 45/004 (2013.01); B21B 45/02 (2013.01); B21B 45/0209 (2013.01); B21B 45/0215 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/10 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C22C 30/00 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); B21B 2045/0227 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01);
Abstract

An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50° C. or more from the cooling start temperature and being equal to or above 600° C. at an average cooling speed of 1.0° C./s or more in terms of an outer surface temperature.

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