COLD-ROLLING STRIP STEEL WITH STRENGTH AND HARDNESS THEREOF VARYING IN THICKNESS DIRECTION AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2020/259531

A1

Disclosed is a method for manufacturing a cold-rolling strip steel (1) with the strength and hardness thereof varying in a thickness direction, the method comprising the steps: smelting, continuous casting, hot rolling, cold rolling, and continuous annealing. When quenching is performed in the continuous annealing step, an asymmetrical quenching and cooling process is performed on both surfaces of the strip steel. In addition, also disclosed is a cold-rolling strip steel (1) with the strength and hardness thereof varying in a thickness direction, which is prepared by the above manufacturing method. The manufacturing method realizes asymmetrical mechanical property distribution of the strip steel by performing an asymmetrical quenching and cooling process on the strip steel, thereby obtaining a gradual hardness gradient in a thickness direction, so as to obtain the combined properties of high hardness and high strength, and also excellent toughness, plasticity and formability, which can effectively deal with the contradiction between the strength, plasticity and toughness of ultra high-strength steel.

ZHU XIAODONG (CN)
XUE PENG (CN)
LI WEI (CN)

PCT/CN2020/097893

December 30, 2020

June 24, 2020

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BAOSHAN IRON & STEEL (CN)

C22C38/02; C21D1/55; C21D8/04; C22C38/04

JP5453748B2	2014-03-26
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CN103108974A	2013-05-15
CN107513661A	2017-12-26
CN109825764A	2019-05-31
CN109576569A	2019-04-05
JP2005298962A	2005-10-27
CN102822375A	2012-12-12
CN102953002A	2013-03-06

SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)

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