1results about How to "No surface cracks" patented technology

This invention provides a continuous casting method for steel that enables high-speed continuous casting even of extremely thick slabs using a vertical unsolidified continuous casting machine, while ensuring the internal quality of the resulting slabs and preventing surface cracking. The continuous casting method of this invention is a method for continuously casting steel slabs using a vertical unsolidified bending continuous casting machine, wherein an alternating current moving magnetic field moving along the width of the mold is applied to the molten steel in the mold using an electromagnetic stirring device within the mold, inducing swirling currents in the molten steel, and continuous casting is performed while stirring the molten steel. The travel speed of the alternating current moving magnetic field, calculated by equation (1) below, is 0.20–1.50 m / s. Here, in equation (1), U is the travel speed of the alternating current moving magnetic field (m / s), τ is the pole spacing of the coil of the electromagnetic stirring device within the mold (m), and f is the frequency (Hz) of the current applied to the coil of the electromagnetic stirring device within the mold. U=2τf………(1).