BAINITE STEEL AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2023/051668

A1

Disclosed in the present invention is a bainite steel, which comprises the following chemical components in percentages by mass: 0.10-0.19% of C, 0.05-0.45% of Si, 1.5-2.2% of Mn, 0.001-0.0035% of B, 0.01-0.05% of Al, 0.05-0.40% of Cr, 0.05-0.40% of Mo, and more than or equal to 90% of Fe. By rationally controlling the contents of C, Si, Mn, B, Al, Cr, Mo, and the other elements in the steel, the steel can spontaneously form a phase having a structural gradient during the preparation process. In addition, the hardenability of the steel is also improved, such that the strength and forming performance of the bainite steel can be improved. Further disclosed in the present invention is a method for preparing the bainite steel, which method comprises the steps of: smelting and casting; hot rolling; cooling after rolling and coiling; pickling and cold rolling; and annealing. By using the preparation method of the present invention, the bainite steel having a structural gradient in the thickness direction can be prepared, and the bainite steel has good formability.

ZHANG HANLONG (CN)
CHEN GUANG (CN)
ZHANG YULONG (CN)
JIN XINYAN (CN)
KE YANGLIN (CN)

PCT/CN2022/122455

April 06, 2023

September 29, 2022

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BAOSHAN IRON & STEEL (CN)

C22C38/02; C21D8/00; C22C33/04; C22C38/04; C22C38/06; C22C38/22; C22C38/32; C22C38/38

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CN103233183A	2013-08-07
CN103526111A	2014-01-22
CN102071362A	2011-05-25
CN102337482A	2012-02-01
CN101254527A	2008-09-03
CN201210368300A	2012-09-28
CN201310724615A	2013-12-25

SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)

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