Continuous casting mold and method for continuous casting of steel

Abstract

A continuous casting mold having low-thermal-conductivity metal filled parts formed by filling a low-thermal-conductivity metal into a plurality of recessed grooves provided in a range from an arbitrary position above a meniscus to an arbitrary position below the meniscus in an inner wall surface of a copper alloy mold copper plate for configuring a water-cooled continuous casting mold, the thermal conductivity [lambda]m (W / (m*K)) of the low-thermal-conductivity metal being 80% or less of the thermal conductivity [lambda]c (W / m*K)) of the mold copper plate, and the thermal resistance ratio R defined by equation (1) being 5% or greater. (1): R=[(T-H) / (1000*[lambda]c)+H / (1000*[lambda]m)-T / (1000*[lambda]c)] / [T / (1000*[lambda]c)]*100. In the formula, R is the thermal resistance ratio (%) of thelow-thermal-conductivity metal filled parts and the mold copper plate, T is the distance (mm) from a bottom surface of a slit in the mold copper plate as a flow path for mold cooling water to the surface of the mold copper plate, and H is the filling thickness (mm) of the low-thermal-conductivity metal.

Description

technical field [0001] The present invention relates to a mold for continuous casting capable of continuously casting molten steel by suppressing surface cracking of slabs caused by uneven cooling of solidified shells in the mold, and a continuous casting method for steel using the mold. Background technique [0002] In continuous casting of steel, molten steel poured into a mold is cooled by a water-cooled continuous casting mold, and the molten steel solidifies at the contact surface with the mold to form a solidified shell (also called a "solidified layer"). The slab with the solidified shell as its outer shell and its interior as an unsolidified layer is continuously drawn downward from the mold while being cooled by a water jet or an air-water jet installed on the downstream side of the mold. The slab is solidified to the center of the thickness by cooling by a water jet or an air-water jet, and then cut by a gas cutter or the like to manufacture a slab of a predetermin...

AI Technical Summary

Problems solved by technology

However, in Patent Document 6, a drilled hole is formed on the surface of the molded copper plate, and a dissimilar metal or ceramic formed in the shape of the drilled hole is embedded therein, so the contact state between the back surface of the embedded dissimilar metal or ceramics and the molded copper plate is not constant. , there is a high possibility of gap formation at the contact portion

When a gap is formed, the amount of heat released by the gap varies greatly at each groove portion, and there arises a problem that the cooling of the solidified shell cannot be properly controlled.

In addition, there is also a problem that embedded dissimilar metals or ceramics are easily peeled off from the mold copper plate

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