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Continuous casting method of slab

A slab and casting mold technology, which is applied in the field of continuous casting of slabs, can solve problems such as not being able to fully meet quality requirements

Active Publication Date: 2020-07-07
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] That is, as the quality of steel sheets for automobile outer panels etc. has become more stringent in recent years, defects caused by inclusion of fine air bubbles and mold flux, which have not been a problem until now, are gradually becoming a problem, and cannot be solved by conventional methods alone. Fully respond to such strict quality requirements

Method used

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  • Continuous casting method of slab
  • Continuous casting method of slab
  • Continuous casting method of slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] was used with figure 1 The shown continuous casting is a test of casting about 300 (ton) aluminum-killed steel molten steel with a slab continuous casting machine using a mold 20 . The cast slab has a thickness of 250 (mm), a width of 1000 (mm) to 2000 (mm), and an injection flow rate of molten steel of 3.0 (ton / min) to 8.0 (ton / min). The molten steel ejection angle (the angle when the horizontal case is set to 0) of the ejection hole of the two-hole submerged nozzle used is 15 (°) downward, and the immersion depth of the submerged nozzle (from the steel in the mold The distance from the liquid surface to the upper end of the discharge hole) is not less than 180 (mm) and less than 300 (mm). The shape of the spray hole of the submerged nozzle is a square with a side length of 80 (mm), and the inner diameter of the submerged nozzle is 80 (mm). Furthermore, argon gas was used as the inert gas blown in from the submerged nozzle. The direction of the jet flow jetted from ...

Embodiment 2

[0160] The following experiments were carried out: using a Figure 4 The shown continuous casting mold 30 is a slab continuous casting machine that casts about 300 (ton) aluminum-killed molten steel. The continuous casting mold 30 includes an upper magnetic pole 6 and a lower magnetic pole 7 . The cast slab has a thickness of 250 (mm), a width of 1800 (mm), and an injection flow rate of molten steel of 5.0 (ton / min) to 8.0 (ton / min). The spray angle of the spray hole of the two-hole submerged nozzle used is downward 15 (°), and the immersion depth of the submerged nozzle (the distance from the molten steel surface in the mold to the upper end of the spray hole) is 180 ( mm) and less than 300 (mm). The shape of the spray hole of the submerged nozzle is a square with a side length of 80 (mm), and the inner diameter of the submerged nozzle is 80 (mm). Furthermore, argon gas was used as the inert gas blown in from the submerged nozzle. The ratio A / P of the molten steel throughp...

Embodiment 3

[0173] The following experiments were carried out: using a Image 6 The slab continuous casting machine of the continuous casting mold 40 as shown casts about 300 (ton) aluminum-killed molten steel, wherein the continuous casting mold 40 is provided with a pair of linearly moving magnetic field generators 42 . The cast slab has a thickness of 250 (mm), a width of 1600 (mm), and an injection flow rate of molten steel of 5.0 (ton / min) to 6.0 (ton / min). The spray angle of the spray hole of the two-hole submerged nozzle used is downward 25 (°), and the immersion depth of the submerged nozzle (the distance from the molten steel surface in the mold to the upper end of the spray hole) is 180 ( mm) and less than 300 (mm). The shape of the spray hole of the submerged nozzle is a square with a side length of 70 (mm), and the inner diameter of the submerged nozzle is 70 (mm). Argon was used as the inert gas blown from the submerged nozzle. The ratio A / P of the molten steel throughput ...

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Abstract

A continuous casting method capable of producing high-quality slabs is provided. In the continuous casting method, a submerged nozzle is arranged in a mold for continuous casting, and molten steel is supplied to the submerged nozzle to perform casting. The submerged nozzle has a pair of discharge holes arranged symmetrically about its vertical axis. Set the immersion depth to 180mm or more and less than 300mm, set the molten steel spraying angle in the range of 15° to 35°, set the ratio A / P of the flow rate A of the inert gas blown to the molten steel throughput P In the range of 2.0NL / ton~3.5NL / ton. The discharge direction of the submerged nozzle is inclined within the range of formula (1) with respect to a reference plane passing through the center of the vertical axis of the submerged nozzle and parallel to the long side surface of the mold. θ‑6≤α≤θ+10···(1), in the formula (1), α is the inclination angle with respect to the reference plane. θ is an angle defined by the following formula (2). tanθ=(D / 2) / (W / 2)...(2), in the formula (2), D is the thickness of the slab. W is the width of the slab.

Description

technical field [0001] The present invention relates to a continuous casting method for producing a high-quality slab with less non-metallic inclusions in the surface layer of the slab by controlling the flow of molten steel in a mold. Background technique [0002] In recent years, the quality requirements of high-grade steel products such as steel sheets for automobile outer panels and steel sheets for cans have become stricter, and it is desired to improve the quality from the slab stage, that is, the continuous casting stage. One of the qualities required for a slab is that there are few non-metallic inclusions (hereinafter also simply referred to as "inclusions") in the surface layer of the slab. [0003] As for the inclusions captured by the surface layer of the slab, the following substances can be listed: [0004] (a) Deoxidation products produced in the deoxidation process of molten steel using aluminum or the like and suspended in molten steel; [0005] (b) Fine o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D11/10B22D11/11
CPCB22D11/10B22D11/115B22D11/117
Inventor 松井章敏伊藤阳一三木祐司田中智紘满园将行千代原亮祐锦织正规
Owner JFE STEEL CORP