Title:
HIGH-STRENGTH STEEL COMPOSITE GALVANIZED SHEET RESISTANT TO LME CRACKING DURING SPOT WELDING, AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/155868
Kind Code:
A1
Abstract:
Disclosed in the present invention are a high-strength steel composite galvanized sheet resistant to LME cracking during spot welding, and a preparation method therefor. The high-strength steel composite galvanized sheet comprises a high-strength steel body (1), low-carbon steel composite layers (2) and a galvanized layer (3), wherein two low-carbon steel composite layers (2) are respectively compounded and rolled on two surfaces of the high-strength steel body (1), the galvanized layer (3) is formed on the surface of at least one low-carbon steel composite layer (2), and a high-strength steel composite galvanized sheet is thus formed. In the present invention, the low-carbon steel composite layers are compounded and rolled on the surfaces of the high-strength steel body, such that liquid metal is prevented from permeating into a base material along a grain boundary during spot welding; therefore, the sensitivity of the high-strength steel composite galvanized sheet to LME during spot welding is reduced, LME cracking during spot welding is effectively avoided, the problem of LME cracking during spot welding is mitigated, the resistance spot-welding performance of the high-strength steel body is improved, and the mechanical properties of a spot-welded joint are obviously improved.
Inventors:
LEI MING (CN)
PAN HUA (CN)
WANG LI (CN)
XUE PENG (CN)
SUN ZHONGQU (CN)
WU TIANHAI (CN)
LIU CHENGJIE (CN)
WU YUE (CN)
WEN ZHONGLING (CN)
PAN HUA (CN)
WANG LI (CN)
XUE PENG (CN)
SUN ZHONGQU (CN)
WU TIANHAI (CN)
LIU CHENGJIE (CN)
WU YUE (CN)
WEN ZHONGLING (CN)
Application Number:
PCT/CN2023/076709
Publication Date:
August 24, 2023
Filing Date:
February 17, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
B21B1/38; C23C2/06
Domestic Patent References:
| WO2021112480A1 | 2021-06-10 |
Foreign References:
| US20190153559A1 | 2019-05-23 | |||
| US20190040487A1 | 2019-02-07 | |||
| JPS61149468A | 1986-07-08 | |||
| JPH04236749A | 1992-08-25 | |||
| CN102553918A | 2012-07-11 | |||
| CN105296854A | 2016-02-03 | |||
| CN108504956A | 2018-09-07 | |||
| CN1273157A | 2000-11-15 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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