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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 12024754 B1

PDFFull Text
Date of Patent:
Jul. 02, 2024

Filed:

Dec. 08, 2022

Method for manufacturing a low-carbon nitrogen-containing austenitic stainless steel bar

Applicant:

Daye Special Steel Co., Ltd., Hubei, CN;

Inventors:

Xiaoliang Dong, Hubei, CN;

Xiuli Zhang, Hubei, CN;

Lixin Zhou, Hubei, CN;

Yinghua Lei, Hubei, CN;

Xianhua Wang, Hubei, CN;

Guangpeng Xu, Hubei, CN;

Peng Xu, Hubei, CN;

Guoyang Sun, Hubei, CN;

Zaoyu Li, Hubei, CN;

Jun Zhang, Hubei, CN;

Dong Ruan, Hubei, CN;

Assignee:

DAYE SPECIAL STEEL CO., LTD., Hubei, CN;

Attorney:

United IP Counselors, LLC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/52 (2006.01); C21C 5/00 (2006.01); C21C 5/52 (2006.01); C21D 1/84 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C22C 33/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/48 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C21D 9/525 (2013.01); C21C 5/005 (2013.01); C21C 5/52 (2013.01); C21D 1/84 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C21D 8/105 (2013.01); C22C 33/04 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/48 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C21D 2211/001 (2013.01);
Abstract

A method for manufacturing a low-carbon nitrogen-containing austenitic stainless steel bar sequentially includes smelting, electroslag remelting, and forging. During electroslag remelting, the steel ingot obtained in the smelting process is used as an electrode bar of the electroslag furnace and is remelted with specific slag and crystallized. The specific slag comprises CaF(65-70%), AlO(15-20%), CaO (5-10%) and MgO (2-5%) in percentage by weight. Specific forging methods, including upsetting-and-drawing and radial forging, are used. In upsetting-and-drawing, the pass deformation is less than 35%, the pass reduction is 50-80 mm, the pass heating temperature is 1130-1150° C., and the pass deformation method is ellipse-ellipse-circle. The method can obtain the low-carbon high-strength nitrogen-containing austenitic stainless steel with uniformly distributed chemical composition, high purity and high strength.

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