Method of manufacturing high-strength steel sheet having excellent processability

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11827950
APP PUB NO 20230080110A1
SERIAL NO

17992240

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Abstract

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Provided is a method of manufacturing a high strength steel sheet having excellent workability, including: reheating a steel slab; hot-rolling the reheated steel slab at an Ar3 transformation point or higher; coiling in a temperature range of 400 to 700° C.; primary cooling at a cooling rate of 0.1° C./s or less to room temperature; producing a cold rolled steel sheet at a cold reduction ratio of 40 to 70%; continuously annealing the cold rolled steel sheet in a temperature range of Ac1+30° C. to Ac3−20° C.; secondary cooling at a cooling rate of 10° C./s or less to 630 to 670° C.; third cooling to 400 to 500° C. at a cooling rate of 5° C./s or more in a hydrogen; maintaining for 70 seconds or more; hot-dip galvanizing; and performing a final cooling to Ms or less at a cooling rate of 1° C./s or more.

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Patent Owner(s)

Patent OwnerAddress
POSCO CO LTDPOHANG-SI GYEONGSANGBUK-DO 37859

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ahn, Yeon-Sang Gwangyang-si, KR 15 11
Choi, Eul-Yong Gwangyang-si, KR 9 25
Choi, Kang-Hyun Gwangyang-si, KR 8 2
Seo, Chang-Hyo Gwangyang-si, KR 13 4

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