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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 12378622 B1

PDFFull Text
Date of Patent:
Aug. 05, 2025

Filed:

Jul. 22, 2019

High-strength steel bar and production method thereof

Applicants:

Institute of Research of Iron & Steel, Jiangsu Province/sha-steel, Co., Ltd., Suzhou, CN;

Zhangjiagang Hongchang Steel Plate Co., Ltd., Suzhou, CN;

Jiangsu Shagang Group Co., Ltd., Suzhou, CN;

Inventors:

Yu Zhang, Suzhou, CN;

Han Ma, Suzhou, CN;

Yun Zhou, Suzhou, CN;

Huande Chen, Suzhou, CN;

Assignees:

INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, CO., LTD., Suzhou, CN;

HANGJIAGANG HONGCHANG STEEL PLATE CO., LTD., Suzhou, CN;

JIANGSU SHAGANG GROUP CO., LTD., Suzhou, CN;

Attorney:

Muncy, Geissler, Olds & Lowe. P.C.

Primary Examiner:

Danielle M Carda

Int. Cl.
CPC ...
C21D 9/00 (2006.01); B22D 11/115 (2006.01); C21D 6/00 (2006.01); C21D 8/06 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (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 9/0075 (2013.01); B22D 11/115 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/065 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (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); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

Disclosed are a high-strength steel bar and a production method therefor. The high-strength steel bar comprises, by mass percentage, the following chemical components: C: 0.15-0.32%, Si+Mn: 0.5-1.9%, Mn+Cr+Mo+Ni: 1.1-2.1%, V: 0.02-0.8%, at least one of Nb, Ti and Al: 0.01-0.3%, and the balance of Fe and inevitable impurities; wherein Mn=(2.5-3.5)Si, and a carbon equivalent satisfies Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15≤0.56%.

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