A primary object of the present invention is to provide a technique of avoiding occurrence of surface defects caused by an electromagnetic brake while checking internal defects with this electromagnetic brake, so that cleanliness of a cast steel can be improved compared with prior arts, and the present invention provides a method for continuously casting steel, the method comprising supplying molten steel into a mold while applying an electromagnetic brake to an outlet flow discharged from an outlet port of an immersion nozzle, wherein magnetic flux density (B) of the electromagnetic brake is within a range of the following (Formula 1):

[00001]$\begin{array}{cc}{B}_{\min }\le B\le B_{\max },.Math.B_{\min }=\frac{800.Math.{\left(\frac{D_{\max }}{D_0}\right)}^3.Math.\left(\frac{H_{\mathrm{SEN}}}{H_0}\right)}{\left(v.Math.\sin .Math..Math.\theta \right)},\mathrm{and}.Math..Math.B_{\max }=\frac{3000.Math.{\left(\frac{D_{\max }}{D_0}\right)}^3.Math.\left(\frac{H_{\mathrm{SEN}}}{H_0}\right)}{{\left(v.Math.\sin .Math..Math.\theta \right)}^2}.& \left(\mathrm{Formula}.Math..Math.1\right)\end{array}$

A primary object of the present invention is to provide a technique of avoiding occurrence of surface defects caused by an electromagnetic brake while checking internal defects with this electromagnetic brake, so that cleanliness of a cast steel can be improved compared with prior arts, and the present invention provides a method for continuously casting steel, the method comprising supplying molten steel into a mold while applying an electromagnetic brake to an outlet flow discharged from an outlet port of an immersion nozzle, wherein magnetic flux density (B) of the electromagnetic brake is within a range of the following (Formula 1):

[00001]$\begin{array}{cc}{B}_{\min }\le B\le B_{\max },.Math.B_{\min }=\frac{800.Math.{\left(\frac{D_{\max }}{D_0}\right)}^3.Math.\left(\frac{H_{\mathrm{SEN}}}{H_0}\right)}{\left(v.Math.\sin .Math..Math.\theta \right)},\mathrm{and}.Math..Math.B_{\max }=\frac{3000.Math.{\left(\frac{D_{\max }}{D_0}\right)}^3.Math.\left(\frac{H_{\mathrm{SEN}}}{H_0}\right)}{{\left(v.Math.\sin .Math..Math.\theta \right)}^2}.& \left(\mathrm{Formula}.Math..Math.1\right)\end{array}$

A breakout prediction method includes: a step of inputting a dimension of a solid product withdrawn from a mold in a continuous casting machine; a step of detecting a temperature of the mold by a plurality of thermometers embedded in the mold; a step of executing interpolation processing on the detected temperatures detected by the plurality of thermometers according to the dimension of the solid product; a step of calculating, based on the temperatures calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained by principal component analysis as a degree of deviation from during a normal operation in which a breakout has not occurred; and a step of predicting a breakout based on the degree of deviation.

A breakout prediction method includes: a step of inputting a dimension of a solid product withdrawn from a mold in a continuous casting machine; a step of detecting a temperature of the mold by a plurality of thermometers embedded in the mold; a step of executing interpolation processing on the detected temperatures detected by the plurality of thermometers according to the dimension of the solid product; a step of calculating, based on the temperatures calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained by principal component analysis as a degree of deviation from during a normal operation in which a breakout has not occurred; and a step of predicting a breakout based on the degree of deviation.

A production apparatus for short-process metal composite plate manufacturing, the apparatus including a metal supply device including an uncoiler (1), pinch roll (2), shot blasting machine (3), welding device (4), welding pinch roll (5), induction heating apparatus (6), metal delivery machine (7), two crystallization cooling rolls (8), secondary cooling leveling roll (9), rolling mill pinch roll (10), rolling mill (11), on-line cooling apparatus (12), straightener (13), and at least one of a dividing shear (14) and a recoiling machine (15). Also disclosed is a production method for short-process metal composite plate manufacturing. The apparatus and method combine continuous casting, rolling, and heat-treating means for single material production with continuous and large-scale production of composite plate strips, and production efficiency of composite plates is sharply improved. Single-sided or double-sided composite plate production having different thickness specifications can be performed, the optional range of a base layer or cladding material is wide.

A twin roll casting system includes a pair of counter-rotating casting rolls having an adjustable nip therebetween, a casting roll controller configured to adjust the nip between the casting rolls in response to control signals; a cast strip sensor measuring a parameter of the cast strip and generating strip measurement signals; and an iterative learning control (ILC) controller receiving the strip measurement signals and providing control signals to the casting roll controller. The ILC controller includes a fault detection algorithm receiving the control signals and the strip measurement signals and generating a fault detection signal indicating when a fault condition is detected and an iterative learning control algorithm to generate the control signals. The fault detection algorithm indicates a fault condition when it detects the control signal exceeding an upper control saturation threshold or the ILC controller operating a state that is not guaranteed as stable.

This method for balancing a flow of liquid steel into a casting mold, in which the steel is introduced into the casting mold from a tundish through a protective nozzle which opens below the steel level into the casting mold, comprises the following steps: a) acquiring a set of characteristics of the flow in the casting mold, b) comparing the flow characteristics acquired in the previous step with a predefined model and determining the adjustment actions to take in order to balance the flow, and c) adjusting the flow.

In a sliding gate, a flow path vertical angle a between a flow path axial direction and a vertical downstream direction in a flow path hole in each plate is 5° or more and 75° or less, and a flow path axial direction projected on sliding surface in which the flow path axial direction is projected on a sliding surface differs between the plates and is changed clockwise or counterclockwise toward a downstream side. Then, molten metal forms a turning flow in the flow path hole of the sliding gate. Furthermore, the molten metal also forms a turning flow in a ladle shroud on the downstream side of the sliding gate.

In a sliding gate, a flow path vertical angle a between a flow path axial direction and a vertical downstream direction in a flow path hole in each plate is 5° or more and 75° or less, and a flow path axial direction projected on sliding surface in which the flow path axial direction is projected on a sliding surface differs between the plates and is changed clockwise or counterclockwise toward a downstream side. Then, molten metal forms a turning flow in the flow path hole of the sliding gate. Furthermore, the molten metal also forms a turning flow in a ladle shroud on the downstream side of the sliding gate.

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.