MOLD FOR CONTINUOUS CASTING AND CONTINUOUS CASTING METHOD FOR STEEL

Title:

MOLD FOR CONTINUOUS CASTING AND CONTINUOUS CASTING METHOD FOR STEEL

Document Type and Number:

WIPO Patent Application WO/2016/067578

Kind Code:

A1

Abstract:

Provided is a mold for continuous casting, capable of preventing surface cracks in slabs caused by non-uniformities in solidifying shell thickness caused by the transformation of δ-iron to γ-iron in medium-carbon steel during peritectic reactions. The mold for continuous casting comprises a mold copper plate made of copper or a copper alloy, and has, at least on an inner wall surface of the mold copper plate 1 from the meniscus to a position 20 mm or more lower than the meniscus, a plurality of respectively independent heterologous metal filled sections 3 having a diameter of 2-20 mm, which are formed by filling circular recesses provided on the inner wall surface with a metal having a thermal conductivity that is 80%-125% with respect to the thermal conductivity of the mold copper plate. The ratio between the Vickers hardness HVc of the mold copper plate and the Vickers hardness HVm of the filled metal satisfies formula (1), and the ratio between the thermal expansion coefficient αc of the mold copper plate and the thermal expansion coefficient αm of the filled metal satisfies formula (2): 0.3 ≤ HVc/HVm ≤ 2.3 . . (1), 0.7 ≤ αc/αm ≤ 3.5 . . (2).

Inventors:

FURUMAI KOHEI (JP)
IWATA NAOMICHI (JP)
ARAMAKI NORICHIKA (JP)
MIKI YUJI (JP)

Application Number:

PCT/JP2015/005339

Publication Date:

May 06, 2016

Filing Date:

October 23, 2015

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B22D11/059; B22D11/04; B22D11/055; B22D11/108

Domestic Patent References:

WO2014002409A1

2014-01-03

Foreign References:

JPH01170550A	1989-07-05
JP2013078797A	2013-05-02
JP2002103004A	2002-04-09
JP2001105102A	2001-04-17
JP2015107522A	2015-06-11
JP2015051442A	2015-03-19

Other References: