SECONDARY COOLING METHOD AND SECONDARY COOLING APPARATUS FOR CONTINUOUS CASTING SLAB

WIPO Patent Application WO/2021/006253

A1

Provided are a secondary cooling method and a secondary cooling apparatus for a continuous casting slab, which can achieve efficient secondary cooling without requiring a large capital investment.　The secondary cooling method for a continuous casting slab, in which a slab 3 cast by a continuous casting machine 1 is secondarily cooled in a secondary cooling band 11 having a vertical band 5, a curved band 7, and a horizontal band 9, comprises: a pre-stage cooling step in a pre-stage cooling unit 13 of an upstream portion of the horizontal band 9; and a post-stage cooling step in a post-stage cooling unit 15 of a downstream portion of the horizontal band. In the pre-stage cooling step, the slab is cooled by a coolant having a flow rate density of 300-4000 l/(m2·min), and a boiling state of the coolant on the surface of the slab is set to nuclear boiling in the pre-stage cooling step. In the post-stage cooling step, the slab is cooled by a coolant having a flow rate density of 2-50% inclusive of the flow rate density of the coolant in the pre-stage cooling step, and a boiling state of the coolant on the surface of the slab is maintained at nuclear boiling in the post-stage cooling step.

SUGIHARA HIROKAZU (JP)
OSUKA KENICHI (JP)
UEOKA SATOSHI (JP)

PCT/JP2020/026487

January 14, 2021

July 06, 2020

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JFE STEEL CORP (JP)

B22D11/124; B22D11/22

JP2018015781A	2018-02-01
JP2014200803A	2014-10-27
JP2003285147A	2003-10-07

J.V. BECK, INT. J. MASS TRANSFER, vol. 13, 1970, pages 703
See also references of EP 3998126A4

KUMASAKA Akira et al. (JP)

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