Title:
HIGH-STRENGTH AND HIGH FORMABILITY COLD-ROLLED HOT-GALVANIZED STRIP STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/246939
Kind Code:
A1
Abstract:
Disclosed in the present invention is a high-strength and high formability cold-rolled hot-galvanized strip steel, comprising a substrate and a zinc coating plated on the substrate. The substrate comprises Fe and inevitable impurities, and further comprises the following chemical elements in percentage by mass: C: 0.15-0.25%; Mn: 2.2-3.0%; Si: 0.3-0.9%; Al: 0.1-0.5%; Nb: 0.01-0.1%; Ti: 0.01-0.1%; and Cr: 0.01-0.3%. A base of a microstructure of the substrate comprises retained austenite having a volume fraction of 5-15%, and the microstructure further comprises a carbide precipitated phase having a size less than 80 nm. Accordingly, further disclosed in the present invention is a manufacturing method for the high-strength and high formability cold-rolled hot-galvanized strip steel, comprising the steps of: (1) smelting and casting; (2) hot rolling; (3) pickling; (4) cold rolling; (5) hot galvanizing and recrystallization annealing; and (6) cooling after galvanizing.
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Inventors:
WANG JUNFENG (CN)
ZHU XIAODONG (CN)
WU ZHANGWEI (CN)
ZHENG TAO (CN)
ZHU XIAODONG (CN)
WU ZHANGWEI (CN)
ZHENG TAO (CN)
Application Number:
PCT/CN2023/102174
Publication Date:
December 28, 2023
Filing Date:
June 25, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C21D8/02; C22C38/02; C22C38/04; C22C38/06; C22C38/12; C22C38/14; C22C38/18; C22C38/26; C22C38/28; C22C38/38; C23C2/06; C23C2/40
Foreign References:
| CN111748746A | 2020-10-09 | |||
| CN111748745A | 2020-10-09 | |||
| CN112301293A | 2021-02-02 | |||
| CN113416889A | 2021-09-21 | |||
| CN113416887A | 2021-09-21 | |||
| CN114438400A | 2022-05-06 | |||
| JP2012107319A | 2012-06-07 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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