ULTRAHIGH-STRENGTH COLD-ROLLED STEEL STRIP HAVING TENSILE STRENGTH OF 1450 MPA OR ABOVE AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2023/208254

A1

Disclosed in the present invention is an ultrahigh-strength cold-rolled steel strip having a tensile strength of 1450 MPa or above, comprising Fe and inevitable impurity elements, and further comprising the following chemical elements in percentage by mass: 0.19-0.245% of C, 0.03-0.45% of Si, 0.8-1.2% of Mn, 0.001-0.004% of B, 0.05-0.15% of Cu, 0.05-0.15% of Zr, 0.005-0.05% of Ti, and 0.01-0.08% of Al. The microstructure of said ultrahigh-strength cold-rolled steel strip comprises a matrix and carbide particles uniformly dispersed in the matrix, wherein the matrix has tempered martensite the volume fraction of which is 95% or above, and the average diameter of the carbide particles does not exceed 0.5 microns. In addition, further disclosed in the present invention is a manufacturing method for said ultrahigh-strength cold-rolled steel strip, comprising the following steps of: (1) smelting and casting, (2) hot rolling, (3) cold rolling after acid pickling, (4) continuous annealing, (5) tempering, and (6) leveling.

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

PCT/CN2023/099743

November 02, 2023

June 12, 2023

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BAOSHAN IRON & STEEL (CN)

C21D6/00; C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/06; C22C38/28; C22C38/32

WO2021176249A1

2021-09-10

KR20210147254A	2021-12-07
US20190003004A1	2019-01-03
KR20210147255A	2021-12-07
KR20200134397A	2020-12-02
US20170022582A1	2017-01-26
US20220112575A1	2022-04-14

SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)

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