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Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel

A technology of oriented silicon steel and equiaxed crystallinity, applied in the field of steel-making slab continuous casting, can solve the problems of unable to produce high-grade non-oriented silicon steel, unable to install electromagnetic stirring device, small space of continuous casting machine, etc. Corrugation defects, effects of improved thermodynamic and kinetic conditions, improved interior and surface quality

Inactive Publication Date: 2010-10-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the compact structure of the slab continuous casting machine with a medium thickness of 100-150mm, the space of the continuous casting machine is small, and the roll diameters of the bending section and the arc section of the secondary cooling zone are small, only 150mm and 175mm respectively, so it is impossible to install a conventional electromagnetic stirring device
At present, there is no way to increase the ratio of equiaxed crystals to produce silicon steel continuous casting slabs with 100-150mm medium-thickness slab continuous casting machines. Therefore, it is impossible to produce qualified high-grade non-oriented silicon steel.

Method used

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  • Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel
  • Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel
  • Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Converter smelting, RH-TB vacuum treatment to obtain C: 0.003%, Si: 2.0%, Mn: 0.25%, P: 0.08%, S: 0.005%, Al: 0.25%, N: 0.0035%, O: 0.012%, Ti , V, Nb, Zr, Gr, Cu and other trace alloys are all 3 / h, the flow rate of cooling water on the wide side of the crystallizer is 272m 3 / h; Two-hole submerged nozzle, nozzle angle 15°. Compared with the proportion of equiaxed grains of continuous casting slab produced without electromagnetic stirring, see Table 1.

[0015] Table 1 Effect of electromagnetic stirring and continuous casting process system on the internal quality of 135mm thick slab

[0016]

Embodiment 2

[0018] Converter smelting, RH-TB vacuum treatment to obtain C: 0.0040%, Si: 2.0%, Mn: 0.3%, P: 0.08%, S: 0.004%, Al: 0.27%, N: 0.0040%, O: 0.012%, Ti , V, Nb, Zr, Gr, Cu and other trace alloys are all less than 0.005%, and the rest is Fe. It is continuously cast into slabs and hot rolled at a casting speed of 2.0m / min, and then pickled and cold rolled into 0.5mm thick slabs. Cold-rolled sheet, finished silicon steel sheet after final annealing. Continuous casting machine crystallizer cooling system: the flow rate of cooling water on the narrow side of the crystallizer is 19m 3 / h, the flow rate of cooling water on the wide side of the crystallizer is 274m 3 / h; Two-hole submerged nozzle, nozzle angle 15°. Compared with the proportion of equiaxed grains of continuous casting slab produced without electromagnetic stirring, see Table 2.

[0019] Table 2 Effect of electromagnetic stirring and continuous casting process system on the internal quality of 150mm thick slab

[0020...

Embodiment 3

[0022] Converter smelting, RH-TB vacuum treatment to obtain C: 0.003%, Si: 2.0%, Mn: 0.25%, P: 0.08%, S: 0.004%, Al: 0.28%, N: 0.0035%, O: 0.011%, Ti , V, Nb, Zr, Gr, Cu and other trace alloys are all less than 0.005%, and the rest is Fe. It is continuously cast into slabs and hot rolled at a casting speed of 2.5m / min, and then pickled and cold rolled into 0.5mm thick slabs. Cold-rolled sheet, finished silicon steel sheet after final annealing. Mold cooling system of continuous casting machine: the cooling water flow rate of the narrow side of the mold is 18m 3 / h, the flow rate of cooling water on the wide side of the crystallizer is 270m 3 / h; Two-hole submerged nozzle, nozzle angle 15°. Compared with the equiaxed grain ratio of continuous casting slab produced without electromagnetic stirring, see Table 3.

[0023] Table 3 Effect of electromagnetic stirring and continuous casting process system on the internal quality of 100mm thick slab

[0024]

[0025]Tables 1 to ...

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Abstract

The present invention provides a continuous casting method capable of increasing non-oriented silicon steel medium-thickness continuous cast slab equiaxial crystal rate. It is characterized by that it adopts a medium-thickness slab continuous casting machine, in the continuous casting second cooling zone it adopts a roller electromagnetic stirring equipment. The casting billet size of continuous casting machine is 100-150mmX850-1550mm, pouring speed is 1.5-3.5m / min, the cooling pattern: the narrow edge of crystallizer is 14-25m3 / h, the wide edge of crystallizer is 250-290m3 / h and second cooling intensity is 1.3-1.8L / kg. The described electromagnetic stirring equipment includes 2-4 pairs of introroller built-in traveling wave magnetic field type electromagnetic stirring devices which are assembled into two groups and mounted.

Description

technical field [0001] The invention belongs to the technical field of continuous casting of steelmaking slabs, in particular to a continuous casting method for increasing the equiaxed crystal ratio of medium-thickness continuous casting slabs of non-oriented silicon steel. Background technique [0002] An important quality problem in the production of high-grade non-oriented silicon steel in the world is that due to the poor heat transfer capacity of silicon steel and the continuous casting conditions of forced cooling, the columnar crystals of the solidification structure of the slab are developed, resulting in cold-rolled non-oriented silicon steel products. Corrugated defects appear on the surface. Production practice shows that when the silicon content of cold-rolled non-oriented silicon steel is >1.7% and the carbon content is ≤0.01%, the columnar crystals of the slab are very developed. The well-developed columnar crystals will cause internal cracks and central se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115
Inventor 张洪峰张旭升任子平王军姚伟智赵爱英汪荣杰张维维李晓伟
Owner ANGANG STEEL CO LTD
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