Title:
800MPA-GRADE HIGH-HOLE-EXPANSION HOT-DIP GALVANIZED STEEL PLATE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/241631
Kind Code:
A1
Abstract:
Disclosed in the present invention are a 800MPa-grade high-hole-expansion hot-dip galvanized steel plate and a manufacturing method therefor. The steel plate comprises a substrate and a hot-dip galvanizing layer plated on at least one surface of the substrate, wherein the substrate contains Fe and inevitable impurity elements, and further contains the following chemical elements in percentage by mass: 0.03-0.08% of C, 0＜Si≤0.45%, 1.3-1.8% of Mn, 0.02-0.1% of Al, 0.2-0.6% of Cr, 0.05-0.15% of Ti, Nb≤0.05%, and B≤0.003%, the mass percentage contents of N, Ti and Nb also satisfying 0.01%≤(Ti-3.43 N+0.52 Nb)/4≤0.03%. The 800MPa-grade high-hole-expansion hot-dip galvanized steel plate has very excellent mechanical properties, longitudinal yield strength thereof being ≥660MPa, tensile strength thereof being ≥780MPa, an elongation percentage A50 thereof being ≥15%, a punching hole-expansion rate thereof being≥50%, and a reaming hole-expansion rate being ≥80%.
Inventors:
LIU CHUNSU (CN)
ZHANG YULONG (CN)
MA XUEDAN (CN)
HUANG CAIGEN (CN)
CHEN GUANG (CN)
JIN XINYAN (CN)
ZHU XIAODONG (CN)
LUO SHUAI (CN)
ZHANG YULONG (CN)
MA XUEDAN (CN)
HUANG CAIGEN (CN)
CHEN GUANG (CN)
JIN XINYAN (CN)
ZHU XIAODONG (CN)
LUO SHUAI (CN)
Application Number:
PCT/CN2023/100255
Publication Date:
December 21, 2023
Filing Date:
June 14, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/00; B22D11/00; C21D8/02; C22C38/02; C22C38/06; C22C38/14; C22C38/18; C22C38/32; C22C38/38; C22C38/48; C23C2/06
Foreign References:
| CN108441763A | 2018-08-24 | |||
| CN110983196A | 2020-04-10 | |||
| CN108707815A | 2018-10-26 | |||
| CN113481430A | 2021-10-08 | |||
| CN113584375A | 2021-11-02 | |||
| JPH11241141A | 1999-09-07 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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