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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 10851432 B1

PDFFull Text
Date of Patent:
Dec. 01, 2020

Filed:

Jun. 17, 2016

Ultra-high strength and ultra-high toughness casing steel, oil casing, and manufacturing method thereof

Applicant:

Baoshan Iron & Steel Co., Ltd., Shanghai, CN;

Inventors:

Xiaoming Dong, Shanghai, CN;

Zhonghua Zhang, Shanghai, CN;

Xiaodong Jin, Shanghai, CN;

Assignee:

BAOSHAN IRON & STEEL CO., LTD., Shanghai, CN;

Attorney:

Neal, Gerber & Eisenberg LLP

Primary Examiner:

Sheng H Davis

Assistant Examiner:

Christopher Douglas Moody

Int. Cl.
CPC ...
C21D 9/14 (2006.01); C22C 38/24 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/28 (2006.01); C22C 38/18 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); E21B 17/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/14 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/105 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); E21B 17/00 (2013.01);
Abstract

The present invention discloses an ultra-high strength and ultra-high toughness casing steel, having a microstructure of tempered sorbite, and the content of chemical elements by mass percent thereof being as follows: C: 0.1-0.22%, Si: 0.1-0.4%, Mn: 0.5-1.5%, Cr: 1-1.5%, Mo: 1-1.5%, Nb: 0.01-0.04%, V: 0.2-0.3%, Al: 0.01-0.05%, Ca: 0.0005-0.005%, the balance being Fe and unavoidable impurities. Correspondingly, the invention also discloses a casing obtained by processing the ultra-high strength and ultra-high toughness casing steel and a manufacturing method thereof. The ultra-high strength and ultra-toughness casing steel and the casing of the present invention have a strength of 155 ksi or more and an impact toughness greater than 10% of its yield strength value, thereby realizing a combination of ultra-high strength and ultra-high toughness.

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