Vertical electromagnetic stirring method for controlling casting blank center quality

Abstract

The invention belongs to the technical field of continuous casting electromagnetic stirring, and particularly relates to a vertical electromagnetic stirring method for controlling casting blank center quality. In the continuous casting production process, a traveling wave magnetic field type stirrer is arranged on the side face of a casting blank, and the overall direction of electromagnetic force generated by the traveling wave magnetic field stirrer in the casting blank is parallel to the direction of the center line of the casting blank. Traveling wave magnetic field stirrers in different shapes can be selected according to different cross-section shapes and sizes of casting blanks. The supply frequency of the vertical electromagnetic stirrer is 0.5-50 Hz, and the current of the vertical electromagnetic stirrer is 50-3000 A. By means of the method, melt in the casting blank center area can generate upward or downward forced convection movement along the center line of the casting bank, the effective action area of electromagnetic stirring in the length direction of the casting blank is enlarged, mixing of an upper high-temperature melt area and a lower low-temperature melt area of the casting blank center area is intensified, the feeding capability of upper melt of the casting blank center area to lower melt in solidification is improved, and uniformization of temperature and solute distribution in the casting blank is promoted.

Description

technical field

[0001] The invention belongs to the technical field of continuous casting electromagnetic stirring, and in particular relates to a vertical electromagnetic stirring method for controlling the central mass of a slab. Background technique

[0002] In the continuous casting process, when the slab is solidified at the end, the feeding channel in the central area becomes narrow, and the temperature of the melt is relatively low and the viscosity is high, resulting in increased resistance to liquid metal feeding in the central area of ​​the slab . Relying solely on gravity often cannot meet its feeding requirements, resulting in blockage of liquid metal feeding channels, and continuous porosity, shrinkage cavities, V-shaped segregation, cracks and other defects in the central area of ​​the slab, which seriously affect the center of the slab. quality. Especially for high-quality high-carbon steel, bearing steel, martensitic stainless steel and other steel types, b...

Examples

Embodiment 1

[0041] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0042] (1) Before continuous casting of 1Cr13 martensitic stainless steel, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically erected on the side of the billet, 20mm away from the surface of the billet, and its steel composition w(%) 0.12 C, 0.60 Si, 0.60 Mn, 0.035 P, 0.03 S, 13 Cr, and the balance Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 600mm, the height of the stirrer is 450mm, and the magnetic pole The number is 3;

[0043] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, and the stirring current is selected as 350A; when the continuous casting starts, the vertical electromagnetic s...

Embodiment 2

[0046] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0047] (1) Before continuous casting of high-carbon GCr15 bearing steel, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically placed on the side of the billet, 30mm away from the surface of the billet, and its steel composition is w(%) 0.98 C, 0.20 Si, 0.30 Mn, 0.035 P, 0.002 S, 1.48 Cr, 0.03Ni, 0.05Cu, balance Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 550mm, and the stirrer The height is 450mm, and the number of magnetic poles is 3;

[0048] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, the stirring current is 320A, and the vertical electromagnetic stirring is carried out at the beginn...

Embodiment 3

[0051] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0052] (1) Before the continuous casting of peritectic steel Q235 steel with a carbon content of 0.13, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically placed on the side of the casting slab, and the distance from the surface of the slab is 25mm. The component w (%) is 0.13 C, 0.30 Si, 0.40 Mn, 0.045 P, 0.035 S, and the balance is Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 580 mm, and the height of the stirrer is 450mm, the number of magnetic poles is 3;

[0053] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, and the stirring current is selected as 300A. The continuous casting starts ...

technical field

[0001] The invention belongs to the technical field of continuous casting electromagnetic stirring, and in particular relates to a vertical electromagnetic stirring method for controlling the central mass of a slab. Background technique

[0002] In the continuous casting process, when the slab is solidified at the end, the feeding channel in the central area becomes narrow, and the temperature of the melt is relatively low and the viscosity is high, resulting in increased resistance to liquid metal feeding in the central area of ​​the slab . Relying solely on gravity often cannot meet its feeding requirements, resulting in blockage of liquid metal feeding channels, and continuous porosity, shrinkage cavities, V-shaped segregation, cracks and other defects in the central area of ​​the slab, which seriously affect the center of the slab. quality. Especially for high-quality high-carbon steel, bearing steel, martensitic stainless steel and other steel types, b...

Examples

Embodiment 1

[0041] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0042] (1) Before continuous casting of 1Cr13 martensitic stainless steel, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically erected on the side of the billet, 20mm away from the surface of the billet, and its steel composition w(%) 0.12 C, 0.60 Si, 0.60 Mn, 0.035 P, 0.03 S, 13 Cr, and the balance Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 600mm, the height of the stirrer is 450mm, and the magnetic pole The number is 3;

[0043] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, and the stirring current is selected as 350A; when the continuous casting starts, the vertical electromagnetic s...

Embodiment 2

[0046] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0047] (1) Before continuous casting of high-carbon GCr15 bearing steel, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically placed on the side of the billet, 30mm away from the surface of the billet, and its steel composition is w(%) 0.98 C, 0.20 Si, 0.30 Mn, 0.035 P, 0.002 S, 1.48 Cr, 0.03Ni, 0.05Cu, balance Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 550mm, and the stirrer The height is 450mm, and the number of magnetic poles is 3;

[0048] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, the stirring current is 320A, and the vertical electromagnetic stirring is carried out at the beginn...

Embodiment 3

[0051] The vertical electromagnetic stirring method of the control slab center quality of the present embodiment is carried out according to the following steps:

[0052] (1) Before the continuous casting of peritectic steel Q235 steel with a carbon content of 0.13, a rectangular traveling wave magnetic field type vertical electromagnetic stirrer is vertically placed on the side of the casting slab, and the distance from the surface of the slab is 25mm. The component w (%) is 0.13 C, 0.30 Si, 0.40 Mn, 0.045 P, 0.035 S, and the balance is Fe; the distance between the upper end of the rectangular vertical electromagnetic stirrer and the lower end of the crystallizer is 580 mm, and the height of the stirrer is 450mm, the number of magnetic poles is 3;

[0053] (2) During the continuous casting process, the power frequency of the traveling wave magnetic field type vertical electromagnetic stirrer is 12Hz, and the stirring current is selected as 300A. The continuous casting starts ...

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