Jfe Steel Corporation

Naomichi Iwata

Takeshi Suzuki

Yuji Miki

Norichika Aramaki

Seiji Nabeshima

Kohei Furumai

Seiji Nabesima

Tomohisa Masumitsu

Continuous casting mold is provided having a mold copper plate having plural separate portions filled with foreign metal formed by filling concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less or 125% or more of the mold copper plate, the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies expression (1), and the ratio of the thermal expansion coefficient &#x3b1;c of the mold copper plate and the thermal expansion coefficient &#x3b1;m of the filling metal satisfies expression (2).0.3&#x2264;HV/HV&#x2264;2.3&#x2003;&#x2003;(1),0.7&#x2264;&#x3b1;&#x2264;3.5&#x2003;&#x2003;(2)

Continuous casting mold and method for continuous casting of steel (as amended)

A continuous casting mold according to the present invention has plural separate portions filled with a metal of low thermal conductivity formed by filling a metal having a thermal conductivity of 30% or less of that of copper into circular concave grooves having a diameter of 2 to 20 mm which are formed in the region of the inner wall surface of the copper mold from an arbitrary position higher than a meniscus to a position 20 mm or more lower than the meniscus, in which the filling thickness of the metal in the portions filled with the metal of low thermal conductivity is equal to or less than the depth of the circular concave grooves and satisfies the relationship with the diameter of the portions filled with the metal of low thermal conductivity expressed by expression (1) below:0.5&#x2264;&#x2003;&#x2003;(1).

Continuous casting mold and method for continuous casting of steel

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Handa, Japan

Naomichi Iwata