The present invention discloses a wire rod for an ultrahigh-strength steel cord and a manufacturing method thereof. The manufacturing method includes: smelting molten steel where inclusions in sizes ≥5 μm are at a number density ≤0.5/mm.sup.2 and sizes of inclusions are ≤30 μm; casting the molten steel into an ingot blank with a center carbon segregation value of 0.92-1.08; cogging the ingot blank into an intermediate blank with a center carbon segregation value of 0.95-1.05; rolling the intermediate blank into a wire rod; and performing temperature control cooling on the wire rod to obtain a wire rod with high purity, high homogeneity and tensile strength ≤1,150 MPa. The wire rod may be used for an ultrahigh-strength steel cord with single tensile strength ≥3,600 MPa.

This electromagnetic stirring device configured to apply an electromagnetic force which generates a swirling flow around a vertical axis to molten metal in a mold by generating a rotating magnetic field in the mold, which is a quadrangular tubular mold for continuous casting, the electromagnetic stirring device provided with an iron core enclosing the mold at a side of the mold and including two teeth arranged side by side in a circumferential direction of the mold so as to face an outer side surface for each of outer side surfaces of the mold, coils wound around the respective teeth of the iron core, and a power supply device which applies an alternating current to each of the coils with a phase shift by 90° in arrangement order of the coils so as to generate the rotating magnetic field.

This electromagnetic stirring device configured to apply an electromagnetic force which generates a swirling flow around a vertical axis to molten metal in a mold by generating a rotating magnetic field in the mold, which is a quadrangular tubular mold for continuous casting, the electromagnetic stirring device provided with an iron core enclosing the mold at a side of the mold and including two teeth arranged side by side in a circumferential direction of the mold so as to face an outer side surface for each of outer side surfaces of the mold, coils wound around the respective teeth of the iron core, and a power supply device which applies an alternating current to each of the coils with a phase shift by 90° in arrangement order of the coils so as to generate the rotating magnetic field.

Apparatus to control continuous casting, including a mold provided with at least one entrance end through which liquid metal is introduced. Furthermore, the apparatus to control continuous casting includes at least one electromagnetic brake associated with the mold, configured to induce in the liquid metal recirculation flows, and a control and command unit connected at least to the electromagnetic brake and configured to manage the functioning thereof.

Apparatus to control continuous casting, including a mold provided with at least one entrance end through which liquid metal is introduced. Furthermore, the apparatus to control continuous casting includes at least one electromagnetic brake associated with the mold, configured to induce in the liquid metal recirculation flows, and a control and command unit connected at least to the electromagnetic brake and configured to manage the functioning thereof.

Systems and methods may utilize magnetic rotors to heat molten metal in the corner regions of a mold during casting (e.g., casting of an ingot, billet, or slab). The magnetic rotors are positioned adjacent to the corners of the mold and heat the molten metal in the corner region to increase the temperature of the molten metal adjacent the corners. The increased temperature of the molten metal in the mold corners can prevent intermetallics from forming in the molten metal or otherwise reduce such formation.

Described herein are techniques for improving the grain structure of a metal product by applying ultrasonic energy to a continuously cast metal product at a position downstream from the casting region and allowing the ultrasonic energy to propagate through the metal product to the solidification region. At the solidification region, the ultrasonic energy can interact with the growing metal grains, such as to deagglomerate and disperse nucleating particles and to disrupt and fragment dendrites as they grow, which can promote additional nucleation and result in smaller grain sizes.

Described herein are techniques for improving the grain structure of a metal product by applying ultrasonic energy to a continuously cast metal product at a position downstream from the casting region and allowing the ultrasonic energy to propagate through the metal product to the solidification region. At the solidification region, the ultrasonic energy can interact with the growing metal grains, such as to deagglomerate and disperse nucleating particles and to disrupt and fragment dendrites as they grow, which can promote additional nucleation and result in smaller grain sizes.

A continuously casting method including arranging temperature measuring elements according to specified conditions, selecting as evaluation targets for temperatures of copper plates on a wide face of mold values measured by the temperature measuring elements arranged closer to a center in a width direction of a cast slab than short sides of the cast slab under continuous casting at levels of 50 mm or more lower in a slab withdrawal direction than a meniscus of a molten steel in a mold, and adjusting a casting condition such that a standard deviation of the values measured over the width direction of the copper plates on the wide face of mold at a same level in the slab withdrawal direction is 20° C. or lower.

A continuously casting method including arranging temperature measuring elements according to specified conditions, selecting as evaluation targets for temperatures of copper plates on a wide face of mold values measured by the temperature measuring elements arranged closer to a center in a width direction of a cast slab than short sides of the cast slab under continuous casting at levels of 50 mm or more lower in a slab withdrawal direction than a meniscus of a molten steel in a mold, and adjusting a casting condition such that a standard deviation of the values measured over the width direction of the copper plates on the wide face of mold at a same level in the slab withdrawal direction is 20° C. or lower.