Title:
HIGH-STRENGTH STEEL HAVING GOOD DUCTILITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/078111
Kind Code:
A1
Abstract:
Disclosed is a high-strength steel having a good ductility, with the chemical elements thereof, in mass percentages, being: 0.15-0.25 wt% of C, 1.00-2.00 wt% of Si, 1.50-3.00 wt% of Mn, and 0.03-0.06 wt% of Al, with the balance being Fe and other unavoidable impurities. In addition, disclosed is a method for manufacturing the steel, the method comprising the following steps: (1) smelting and thin plate blank continuous casting, wherein the thickness of a plate blank at a continuous casting exit end is controlled to be 55-60 mm; (2) heating; (3) hot rolling, wherein an oxidized scale on the surface of a hot-rolled steel band has a thickness of ≤5 μm, and (FeO+Fe3O4) in the oxidized scale on the surface of the hot-rolled band steel is ≤40 wt%; (4) acid pickling or acid pickling and cold rolling; and (5) continuous annealing.
Inventors:
CHEN MENG (CN)
ZHONG YONG (CN)
WANG SHUIZE (CN)
LI XUFEI (CN)
WANG LI (CN)
MAO XINPING (CN)
ZHONG YONG (CN)
WANG SHUIZE (CN)
LI XUFEI (CN)
WANG LI (CN)
MAO XINPING (CN)
Application Number:
PCT/CN2020/122085
Publication Date:
April 29, 2021
Filing Date:
October 20, 2020
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/00; C21D1/26; C21D9/46
Domestic Patent References:
| WO2015151419A1 | 2015-10-08 | |||
| WO2015151427A1 | 2015-10-08 |
Foreign References:
| CN103805838A | 2014-05-21 | |||
| CN103805840A | 2014-05-21 | |||
| CN106244923A | 2016-12-21 | |||
| CN106350731A | 2017-01-25 | |||
| CN110093552A | 2019-08-06 | |||
| EP1749895A1 | 2007-02-07 | |||
| CN106244924A | 2016-12-21 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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