Title:
HIGH-YIELD-RATIO COLD-ROLLED DUAL-PHASE STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/103927
Kind Code:
A1
Abstract:
Disclosed is a high-yield-ratio cold-rolled dual-phase steel, having the following chemical elements in percentage by mass: 0.05%-0.08% of C, 0.9%-1.2% of Mn, 0.1%-0.6% of Si, 0.030%-0.060% of Nb, 0.030%-0.060% of Ti, 0.015%-0.045% of Al, and the balance being Fe and other inevitable impurities. A manufacturing method for the high-yield-ratio cold-rolled dual-phase steel, comprising the following steps: (1) smelting and casting; (2) hot rolling, wherein a casting blank is controlled such that same is soaked at a temperature of 1200ºC to 1250ºC, then is rolled with the finish rolling temperature being controlled to be 840ºC to 930ºC, is cooled at a speed of 20ºC/s to 70ºC/s after being rolled, and then is wound with the winding temperature being controlled to be 570ºC to 630ºC; (3) cold rolling; (4) annealing, wherein the annealing soaking temperature is 750ºC to 790ºC, the annealing time is 40 s to 200 s, cooling is then carried out at a speed of 30ºC/s to 80ºC/s, the start temperature of cooling is 650ºC to 730ºC, the aging temperature is 200ºC to 260ºC, and the overaging time is 100 s to 400 s; and (5) leveling.
Inventors:
LI WEI (CN)
ZHU XIAODONG (CN)
XUE PENG (CN)
ZHU XIAODONG (CN)
XUE PENG (CN)
Application Number:
PCT/CN2019/120247
Publication Date:
May 28, 2020
Filing Date:
November 22, 2019
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/02; C22C38/04; C22C38/06; C22C38/14
Foreign References:
| CN105274432A | 2016-01-27 | |||
| CN105039848A | 2015-11-11 | |||
| CN107699791A | 2018-02-16 | |||
| CN105925905A | 2016-09-07 | |||
| CN102094149A | 2011-06-15 | |||
| CN103060703A | 2013-04-24 | |||
| CN101768695A | 2010-07-07 | |||
| DE102016121905A1 | 2018-05-17 | |||
| JP2012112039A | 2012-06-14 | |||
| CN105063510A | 2015-11-18 | |||
| CN102766812A | 2012-11-07 |
Other References:
ZHU. XIAODONG ET AL: "Effect of Annealing Parameters on the Transformation and Mechanical Properties of a Low Carbon Dual Phase Steel", BAOSTEEL TECHNOLOGY, 31 December 2014 (2014-12-31), pages 1 - 4 and 17, XP009521333, ISSN: 1008-0716
See also references of EP 3885462A4
See also references of EP 3885462A4
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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