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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 11519048 B1

PDFFull Text
Date of Patent:
Dec. 06, 2022

Filed:

Jul. 13, 2017

Method for the in-line manufacturing of steel tube

Applicant:

Tata Steel Nederland Tubes Bv, Oosterhout, NL;

Inventors:

Steven Celotto, Heiloo, NL;

Gerardus Jacobus Paulussen, Beverwijk, NL;

Arjen Kamp, Leiden, NL;

Robertus Flipsen, Elst, NL;

Assignee:

TATA STEEL NEDERLAND TUBES BV, Oosterhout, NL;

Attorney:

Vorys, Sater, Seymour and Pease LLP

Primary Examiner:

Robert S Jones, Jr

Assistant Examiner:

Jiangtian Xu

Int. Cl.
CPC ...
C21D 9/08 (2006.01); B21C 37/08 (2006.01); C21D 8/10 (2006.01); C21D 9/50 (2006.01); C21D 1/18 (2006.01); C21D 1/42 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); B21C 37/08 (2013.01); C21D 1/18 (2013.01); C21D 1/42 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/10 (2013.01); C21D 8/105 (2013.01); C21D 9/50 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01);
Abstract

A method for manufacturing of steel tube from a long steel strip, including providing a length of steel strip material to the process, forming a tube of the steel strip material, welding the formed tube in longitudinal direction, giving the tube a heat treatment wherein the mentioned steps are performed in one continuous in-line manufacturing line and the heat treatment includes a heating regime such that in successive cross-sections of the tube a microstructure is achieved which holds at least 50 vol % austenite and a cooling trajectory to re-introduce ferrite, and/or bainite in desired volume fractions.

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