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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 9567659 B1

PDFFull Text
Expired
Date of Patent:
Feb. 14, 2017

Filed:

Jul. 02, 2012

Method for manufacturing a high-strength structural steel and a high-strength structural steel product

Applicants:

Mahesh Chandra Somani, Oulu, FI;

David Arthur Porter, Oulu, FI;

Leo Pentti Karjalainen, Oulu, FI;

Tero Tapio Rasmus, Siikajoki, FI;

Ari Mikael Hirvi, Oulu, FI;

Inventors:

Mahesh Chandra Somani, Oulu, FI;

David Arthur Porter, Oulu, FI;

Leo Pentti Karjalainen, Oulu, FI;

Tero Tapio Rasmus, Siikajoki, FI;

Ari Mikael Hirvi, Oulu, FI;

Assignee:

RAUTARUUKKI OYJ, Helsinki, FI;

Attorney:

Sheridan Ross P.C.

Primary Examiner:

Helene Klemanski

Int. Cl.
CPC ...
C21D 1/18 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/58 (2006.01); C21D 9/46 (2006.01); C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); C21D 1/18 (2013.01); C21D 8/005 (2013.01); C21D 8/02 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/34 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01);
Abstract

The invention relates to a method for manufacturing a high-strength structural steel and to a high-strength structural steel product. The method comprises a providing step for providing a steel slab, a heating step () for heating said steel slab to 950 to 1300 C, a temperature equalizing step () for equalizing the temperature of the steel slab, a hot rolling step including a hot rolling stage of type I () for hot rolling the steel slab in the no-recrystallization temperature range below the recrystallization stop temperature (RST) but above the ferrite formation temperature A, a quenching step () for quenching said hot-rolled steel at cooling rate of at least 20 C/s to a quenching-stop temperature (QT) between Ms and Mtemperatures, a partitioning treatment step () for partitioning said hot-rolled steel in order to transfer carbon from martensite to austenite, and a cooling step () for cooling said hot-rolled steel to room temperature.

Find Patent Forward Citations

Somani, Mahesh. (2017). Method for manufacturing a high-strength structural steel and a high-strength structural steel product (U.S. Patent No. 9567659). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9567659

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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