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Title:
COLD ROLLED STEEL PLATE FOR GALVANIZED STEEL PLATE, GALVANIZED STEEL PLATE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/165510
Kind Code:
A1
Abstract:
Disclosed in the present invention is a cold rolled steel plate for a galvanized steel plate, containing Fe and inevitable impurities, and also containing the following chemical elements, in mass percent: 0.18-0.25% of C, 1.5-2.0% of Si, 1.5-2.3% of Mn, and 0.01-0.06% of Nb. The microstructure of the cold rolled steel plate is bainite+tempered martensite+residual austenite, wherein the volume fraction of bainite and tempered martensite is greater than or equal to 95%. Accordingly, also disclosed in the present invention is a manufacturing method for the galvanized steel plate, comprising the steps: (1) smelting and casting to obtain a steel billet; (2) hot rolling; (3) cold rolling; (4) annealing: the annealing soaking temperature is 890-920℃, the soaking and heat preservation time is 80-150s, then cooling is performed at a cooling rate of 30-100°C/s to reach 270-350°C; (5) overaging: the overaging temperature is 450-475°C, and the overaging time is 40-60s: (6) entering a zinc pot for galvanizing; (7) alloying; and (8) leveling.

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Inventors:
XIE SHUANG (CN)
LI XUFEI (CN)
ZHONG YONG (CN)
WANG LI (CN)
Application Number:
PCT/CN2023/078975
Publication Date:
September 07, 2023
Filing Date:
March 01, 2023
Export Citation:
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Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C22C38/00; C22C38/04; C23C2/00
Foreign References:
CN104204238A2014-12-10
CN104781438A2015-07-15
CN113316656A2021-08-27
JP2016216808A2016-12-22
CN106636899A2017-05-10
CN103805840A2014-05-21
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE , LLC (CN)
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