Title:
HYDROGEN INDUCED CRACKING-RESISTANT COLD-ROLLED HOT-DIP GALVANIZED ULTRA-HIGH-STRENGTH DUAL-PHASE STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/241677
Kind Code:
A1
Abstract:
A hydrogen induced cracking-resistant cold-rolled hot-dip galvanized ultra-high-strength dual-phase steel, comprising a substrate and a galvanized layer plated on the substrate, wherein the substrate contains Fe and inevitable impurity elements, and the substrate further contains the following chemical elements in percentage by mass: 0.1-0.18% of C, 2.2-3.0% of Mn, 0.2-0.6% of Si, 0.03-0.3% of Al, 0.01-0.1% of Nb, 0.01-0.1% of Ti, 0.04-0.2% of Mo, and 0.0005-0.003% of B. The matrixes of the microstructure of the substrate are ferrite and martensite, the microstructure of the substrate further comprises a carbide precipitation phase having a size less than 100 nm, and the carbide particles and the matrixes are in a coherent or semi-coherent state. A manufacturing method for the dual-phase steel comprises the following steps: (1) smelting and casting; (2) hot rolling; (3) acid pickling; (4) cold rolling; (5) hot-dip galvanizing and recrystallization annealing; and (6) cooling after galvanizing.
Inventors:
WANG JUNFENG (CN)
ZHU XIAODONG (CN)
ZHENG TAO (CN)
WU ZHANGWEI (CN)
ZHU XIAODONG (CN)
ZHENG TAO (CN)
WU ZHANGWEI (CN)
Application Number:
PCT/CN2023/100602
Publication Date:
December 21, 2023
Filing Date:
June 16, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/00; C21D1/26; C21D8/00; C21D8/02; C22C38/02; C22C38/04; C22C38/06; C22C38/12; C22C38/14; C22C38/16; C22C38/18; C22C38/38; C23C2/00; C23C2/06
Foreign References:
| CN106119716A | 2016-11-16 | |||
| CN108977726A | 2018-12-11 | |||
| CN111748746A | 2020-10-09 | |||
| CN112301293A | 2021-02-02 | |||
| CN113737108A | 2021-12-03 | |||
| JP2011032549A | 2011-02-17 | |||
| JP2015203124A | 2015-11-16 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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