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A continuous casting method for reducing large-size inclusions in the surface layer of aluminum-containing steel slabs

A technology of large-size and inclusions is applied in the field of continuous casting to reduce large-size inclusions on the surface of aluminum-containing steel billets, which can solve the problem of not reducing the content of large-size inclusions on the surface of the billet, reducing the occurrence rate of slag, The effect of reducing the incidence of surface defects and reducing fluctuations

Active Publication Date: 2022-05-20
SHOUGANG CORPORATION
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Problems solved by technology

[0003] The invention provides a continuous casting method for reducing large-size inclusions in the surface layer of aluminum-containing steel slabs, and solves or partially solves the technical problem in the prior art that there is no method for reducing the content of large-size inclusions in the surface layer of slabs

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  • A continuous casting method for reducing large-size inclusions in the surface layer of aluminum-containing steel slabs
  • A continuous casting method for reducing large-size inclusions in the surface layer of aluminum-containing steel slabs

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Embodiment Construction

[0016] see figure 1 A continuous casting method for reducing large-sized inclusions in the surface layer of aluminum-containing steel slabs provided by an embodiment of the present invention includes the following steps:

[0017] The billets are obtained after converter smelting, vacuum treatment, deoxidation alloying and continuous casting.

[0018] Controls the immersion depth of submerged nozzles during continuous casting.

[0019] Control the molten steel jet angle θ so that the molten steel jet angle θ satisfies the following formula tanθ≥

[0020] (H-h SEN -h port -100mm) / (1 / 2W-d SEN ), where H represents the crystallizer length, mm; h SEN Represents the insertion depth of the submerged nozzle, mm; h port Represents the nozzle outlet height, mm; 100mm represents the distance between the molten steel surface and the top of the mold; W represents the mold width, mm; d SEN Represents the outer diameter of the submerged nozzle, mm.

[0021] Specific embodiments of th...

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Abstract

The invention discloses a continuous casting method for reducing large-sized inclusions on the surface of an aluminum-containing steel casting billet, and belongs to the technical field of continuous casting. The continuous casting method for reducing large-sized inclusions in the surface layer of the aluminum-containing steel billet comprises the following steps: obtaining the billet after converter smelting, vacuum treatment, deoxidation alloying and continuous casting; controlling the immersion of the immersion nozzle during the continuous casting process Depth; the molten steel jet angle θ is controlled by controlling the nozzle structure parameters, so that the molten steel jet angle θ satisfies the formula tanθ≥(H‑h SEN ‑h port ‑100mm) / (1 / 2W‑d SEN ), where H represents the length of the crystallizer, mm; h SEN Represents the insertion depth of the immersion nozzle, mm; h port Represents the height of the nozzle outlet, mm; 100mm represents the distance from the molten steel surface to the top of the mold; W represents the width of the mold, mm; d SEN Represents the outer diameter of the immersion nozzle, mm. The continuous casting method for reducing the large-sized inclusions on the surface of the aluminum-containing steel casting billet according to the invention can reduce the number density of the slag and alumina inclusions on the surface of the casting billet, and reduce the occurrence rate of surface defects of the rolled sheet.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a continuous casting method for reducing large-sized inclusions in the surface layer of aluminum-containing steel billets. Background technique [0002] With the increasingly fierce market competition, the surface quality requirements of high-quality cold-rolled steel sheets deoxidized by aluminum are becoming increasingly stringent. The large-sized inclusions distributed on the surface of the slab are deformed, crushed and distributed on the surface of the rolled plate during the rolling process, which affects the surface quality and coating performance of the rolled plate. Therefore, the distribution of inclusions on the surface of the slab must be strictly controlled during continuous casting of high-quality cold-rolled steel sheets. However, in the prior art, there is no method for reducing the content of large-sized inclusions in the surface layer of the slab. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
CPCB22D11/18
Inventor 邓小旋李海波季晨曦朱国森初仁生刘柏松潘宏伟邵肖静张宏艳尹娜刘国梁罗衍昭吕迺冰
Owner SHOUGANG CORPORATION
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