Title:
CONTINUOUS CASTING METHOD OF STEEL
Document Type and Number:
WIPO Patent Application WO/2019/203137
Kind Code:
A1
Abstract:
The present invention reduces the overall segregation level of the center segregation of a continuous cast slab in a slab width direction, and also reduces the variation in the segregation degree in the slab width direction. The continuous casting method of steel according to the present invention comprises: increasing stepwise the roll opening degree of a plurality of pairs of slab support rolls, which is arranged in a continuous casting machine, toward the downstream side in the casting direction, bulging a long side surface of the slab having inside an unsolidified layer with an intentional total bulging amount of 3-10 mm, and then squeezing the long side surface of the slab in a light squeezing zone in which the roll opening degree of a plurality of pairs of slab support rolls is gradually reduced toward the downstream side in the casting direction, wherein in the light squeezing zone, the long side surface of the slab is squeezed at a squeezing speed of 0.3-2.0 mm/min and a total squeezing amount equal to or less than the intended total bulging amount, and a solid phase ratio at the thickness center of the slab in a straightening zone where the casting direction shape of the slab is corrected from an arc shape to a straight line shape is less than 0.2 or is equal to or greater than the flow limit solid phase ratio and equal to or less than 1.0.
Inventors:
ARAMAKI NORICHIKA (JP)
TOISHI KEIGO (JP)
ODAGAKI TOMOYA (JP)
SANO KEISUKE (JP)
IKENO SHIZUHIKO (JP)
TOISHI KEIGO (JP)
ODAGAKI TOMOYA (JP)
SANO KEISUKE (JP)
IKENO SHIZUHIKO (JP)
Application Number:
PCT/JP2019/015895
Publication Date:
October 24, 2019
Filing Date:
April 12, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B22D11/128; B22D11/16; B22D11/20
Domestic Patent References:
| WO2018056322A1 | 2018-03-29 |
Foreign References:
| JP2010069499A | 2010-04-02 | |||
| JP2017024079A | 2017-02-02 | |||
| JP2017131927A | 2017-08-03 | |||
| JP2000141002A | 2000-05-23 | |||
| JPH08132203A | 1996-05-28 | |||
| JPH08192256A | 1996-07-30 | |||
| JP2006198644A | 2006-08-03 | |||
| JP2012045552A | 2012-03-08 |
Other References:
OHNAKAITSUO: "Introduction to Heat transfer and Solidification Analysis by Computers Application to Casting Processes", 1985, MARUZEN CO., LTD., article "Computer Dennetsu Gyoko Kaiseki Nyumon Chuzo Process eno Oyo", pages: 201 - 202
See also references of EP 3782747A4
See also references of EP 3782747A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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