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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 11085098 B1

PDFFull Text
Date of Patent:
Aug. 10, 2021

Filed:

Sep. 16, 2015

Grade 550mpa high-temperature resistant pipeline steel and method of manufacturing same

Applicant:

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

Inventors:

Ping Hu, Shanghai, CN;

Lei Zheng, Shanghai, CN;

Chuanguo Zhang, Shanghai, CN;

Assignee:

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

Attorney:

Quarles & Brady LLP

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/58 (2006.01); B21B 1/22 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (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);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 1/22 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (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 38/58 (2013.01); B21B 2001/225 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01);
Abstract

Disclosed is a Grade 550 MPa high temperature-resistant pipeline steel, the chemical elements, in mass percentage, being: 0.061%≤C≤0.120%, 1.70%≤Mn≤2.20%, 0.15%≤Mo≤0.39%, 0.15%≤Cu≤0.30%, 0.15%≤Ni≤0.50%, 0.035%≤Nb≤0.080%, 0.005%≤V≤0.054%, 0.005%≤Ti≤0.030%, 0.015%≤Al≤0.040%, 0.005%≤Ca≤0.035%, and the balance being Fe and unavoidable impurities. Also disclosed is a manufacturing method of the Grade 550 MPa high temperature-resistant pipeline steel, comprising the steps of: smelting, casting, slab heating, rough rolling, finish rolling, controlled cooling, and air cooling to room temperature. The pipeline steel has an excellent mechanical property under a high temperature.

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