Title:
LOW-COST WEATHERING STEEL AND PRODUCTION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/169077
Kind Code:
A1
Abstract:
Low-cost weathering steel and a production method thereof. The weathering steel comprises components of: less than or equal to 0.03 of C, 0.10-0.50 of Si, 0.50-1.50 of Mn, 0.07-1.50 of P, less than or equal to 0.008 of N, less than or equal to 0.003 of S, less than 0.40 of Cu, less than 0.45 of Cr, and the balance being Fe and inevitable impurities; The protection method comprises the following steps: smelting; carrying out thin-strip continuous casting; continuously casting smelting qualified molten steel into a cast strip having the thickness of 1.4-2.5mm by means of a pair of casting rolls which oppositely rotate, and controlling the casting temperature of the molten steel at 1580-1650°C; carrying out online hot rolling on the cast strip, wherein the cast strip is rolled into a hot rolled thin strip with the thickness of 0.7 to 2.0 mm by means of one-pass hot rolling, the hot rolling reduction is 10-70%, and the temperature of the cast strip entering into a hot rolling mill is greater than 900°C; and after rolling, cooling and reeling, the hot rolled strip steel being cooled to 400 to 500°C by aerosol to obtain a uniform acicular ferrite structure, and soon afterwards reeling into a roll. The yield strength of the low-cost weathering steel is above 345 MPa, and the elongation of the low-cost weathering steel is above 23%. The production control has the characteristics of short production process, low production cost and alloy cost, and excellent surface quality and shape of the hot-rolled strip steel.
Inventors:
LI HUALONG (CN)
CHEN AIHUA (CN)
FENG QINGXIAO (CN)
SHI YIXIN (CN)
LIU JIAN (CN)
MA YI (CN)
ZHOU DONGSHENG (CN)
ZHU YIHAI (CN)
LIU XINYUAN (CN)
LI TINGTING (CN)
LI XIA (CN)
CHEN AIHUA (CN)
FENG QINGXIAO (CN)
SHI YIXIN (CN)
LIU JIAN (CN)
MA YI (CN)
ZHOU DONGSHENG (CN)
ZHU YIHAI (CN)
LIU XINYUAN (CN)
LI TINGTING (CN)
LI XIA (CN)
Application Number:
PCT/CN2020/076118
Publication Date:
August 27, 2020
Filing Date:
February 21, 2020
Export Citation:
Assignee:
JIANGSU SHAGANG GROUP CO LTD (CN)
INSTITUTE OF RES OF IRON & STEEL JIANGSU PROVINCE/SHA-STEEL CO LTD (CN)
ZHANGJIAGANG ZHONGMEI UCS TECH CO LTD (CN)
INSTITUTE OF RES OF IRON & STEEL JIANGSU PROVINCE/SHA-STEEL CO LTD (CN)
ZHANGJIAGANG ZHONGMEI UCS TECH CO LTD (CN)
International Classes:
C22C38/02; B21B1/46; C21D8/02; C22C38/04; C22C38/16; C22C38/18; C22C38/20
Foreign References:
CN109881090A | 2019-06-14 | |||
JPH032321A | 1991-01-08 | |||
JPH032321A | 1991-01-08 | |||
CN104313491A | 2015-01-28 | |||
CN102787278A | 2012-11-21 | |||
JPH04120214A | 1992-04-21 | |||
CN106756602A | 2017-05-31 |
Attorney, Agent or Firm:
LIU, SHEN & ASSOCIATES (CN)
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