Microstructure Control of Continuous Casting Slab of Grain Oriented Silicon Steel

Abstract

In order to study the microstructure control of continuous casting slab of grain oriented silicon steel, the method of field trial was adopted to analyze the influence of different factors on the microstructure of slabs by adjusting the process parameters that affect the formation and transformation of equiaxed crystals and columnar crystals. Studies have shown that as the superheat increases, the proportion of equiaxed crystals in the grain oriented silicon steel slab decreases. The use of electromagnetic stirring can achieve the casting of grain oriented silicon steel under the condition of the superheat exceeds 40°C and the proportion of equiaxed crystals >50%. The box-type of electromagnetic stirring in secondary cooling zone can be used to effectively control the proportion of equiaxed crystals of the slab from 10% to 75%, and increase the electromagnetic stirring current, which contribute to the linear increasing of the proportion of equiaxed crystals. The increasing of the casting speed and width range is conducive to the proportion of equiaxed crystals in slabs. Meanwhile, moderate electromagnetic stirring intensity (400 A, 3 HZ) is beneficial to the uniformity of the slab composition with the optimal effect of improving the segregation along the thickness direction of the slab. The deviation of the measured and predicted value of the equiaxed crystal proportion of the slab is less, the effective control of the equiaxed crystal ratio can be achieved by adjusting the process parameters.

Simulation and Experimental Study of Fluid Flow and Solidification Behavior in Thin Slabs Continuous Casting Process under Secondary Electromagnetic Stirring

“…The grain growth process of the samples was numerically simulated by combining 18 different sets of parameters in Table 7, and the calculated microstructure simulation results were compared with the thermal simulation experiment sample, as shown in Figure 11. It can be seen that the CET positions of Cases 1,4,7,8,9,10,11,13,15,17,and 18 are closer to the thermal simulation experiment sample.…”

“…Zhang et al [7] determined the optimum current intensity by applying different current intensities of mold EMS (M-EMS) and final EMS (F-EMS) to 20CrMnTi gear steel continuous casting slabs and found that the current intensity has a great influence on the solidification organization and segregation of the cast slabs. Li et al [8] used a field test to analyze the effect of EMS intensity on the slab tissue by adjusting it. The results show that the proportion of equiaxed crystal in the slab increases linearly with the increase of EMS intensity.…”

Impact of Electromagnetic Stirring Roller Arrangement Pattern on Magnetic Field Simulation and Solidification Structure of PW800 Steel in the Second Cooling Zone

“…After the application of S-EMS, the equiaxed grain ratio of the casting slab is significantly increased. Previous studies have shown that, for electrical steels, a higher equiaxed grain ratio is closely related to better overall mechanical and magnetic properties [ 28 ].…”

“…After the application of S-EMS, the equiaxed grain ratio of the casting slab is significantly increased. Previous studies have shown that, for electrical steels, a higher equiaxed grain ratio is closely related to better overall mechanical and magnetic properties [28]. Upon observation of the macroscopic structure of the casting slab following the application of S-EMS, two distinct white light bands are clearly visible as a result of electromagnetic stirring.…”

The Angular Velocity as a Function of the Radius in Molten Ga75In25 Alloy Stirred Using a Rotation Magnetic Field

“…The aim of simulating the solidification of alloys (like the semicontinuous casting of aluminium alloys or the continuous casting of steels) is to produce a tool that can integrate the planning of the process parameters, which can guarantee a suitable microstructure and good mechanical properties [1][2][3][4][5]. In the continuous casting of steel, magnetic stirring is used worldwide to obtain a microstructure without a columnar zone and central macrosegregation extending across the centre equiaxed zone, refine the grain size, minimise the shrinkage porosity and macrosegregation, and improve the surface quality [6][7][8][9][10][11][12][13][14][15][16][17][18]. The magnetic induction causes a melt flow, and its simulation is complicated and needs correct data, like the ω(B, r) function.…”