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Method for manufacture of ultra-low carbon steel slab

一种制造方法、超低碳的技术，应用在制造工具、铸造设备、铸造熔融物容器等方向，达到防止喷嘴堵塞的效果

Active Publication Date: 2012-11-28
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] The inventors of the present invention conducted intensive studies to solve the above problems. As a result, they found that if ultra-low carbon molten steel is deoxidized with Ti-rare earth elements (Ce, La, Nd) and impregnated with an orifice in the inner hole, Nozzles can prevent nozzle clogging and enable continuous casting of ultra-low carbon slabs that do not cause surface defects even when processing thin steel plates

Method used

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  • Method for manufacture of ultra-low carbon steel slab
  • Method for manufacture of ultra-low carbon steel slab
  • Method for manufacture of ultra-low carbon steel slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] Hereinafter, by enumerating examples and comparative examples (refer to Table 1), the use of submerged nozzles with various shapes (refer to Table 1) Figure 1~6 ) of the present invention will be described.

[0140]

Embodiment 1-1

[0142] Ti was added to 300 tons of molten steel in a ladle whose carbon concentration was 0.002% by mass by refining in a converter and treated by a vacuum degassing device, deoxidized, refluxed for 6 minutes, and then Ce and La were mixed in the mass ratio Ce / La =1.3 was added as a Ce—La alloy, and refluxed for 3 minutes to melt molten steel with a Ti concentration of 0.03% by mass, a total concentration of Ce and La of 0.01% by mass, and a Ce concentration / La concentration of 1.3.

[0143] The molten steel was cast into a slab with a thickness of 250 mm and a width of 1600 mm under the condition of no Ar gas (flow rate 0 Nl / min) by continuous casting.

[0144] The cross-sectional shape of the dipping nozzle is a perfect circle with an outer diameter of 150 mm and an inner diameter of 85 mm. The material of the inner hole is alumina graphite.

[0145] The length from the upper end of the inner hole to the upper end of the discharge hole is 590 mm, and the inner hole is strai...

Embodiment 1-2

[0152] Ti was added to 300 tons of molten steel in a ladle whose carbon concentration was 0.002% by mass by refining in a converter and treated by a vacuum degassing device, deoxidized, refluxed for 6 minutes, and then Ce and La were mixed in the mass ratio Ce / La =1.3 was added as a Ce—La alloy, and refluxed for 3 minutes to melt molten steel with a Ti concentration of 0.03% by mass, a total concentration of Ce and La of 0.01% by mass, and a Ce concentration / La concentration of 1.3.

[0153] The molten steel was cast into a slab with a thickness of 250 mm and a width of 1600 mm by means of a continuous casting method with an Ar gas flow rate of 2.8 Nl / min blown from the upper nozzle of the tundish.

[0154] The cross-sectional shape of the dipping nozzle is a perfect circle with an outer diameter of 150 mm and an inner diameter of 85 mm. The material of the inner hole is alumina graphite.

[0155] The length from the upper end of the inner hole to the upper end of the dischar...

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Abstract

Disclosed is a method for manufacture of an ultra-low carbon steel slab, which comprises the steps of: adding Ti to a molten steel that has been decarbonated to a degree of 0.01% by mass in terms of a carbon concentration and then further adding at least one element selected from Ce, La and Nd to the mixture; injecting the mixed molten steel from a tundish into a mold using an immersion nozzle under such conditions where an Ar gas is blown from an ambient point located between a nozzle on the tundish and an ejection hole of the immersion nozzle at a gas flow rate of 3 Nl (normal litters) / min or less; and performing casting continuously.

Description

technical field [0001] The invention relates to a method for manufacturing ultra-low carbon slab by continuous casting. Background technique [0002] For dissolved oxygen in molten steel refined with a converter or a vacuum treatment vessel, Al, a strong deoxidizing element, is generally used for deoxidation. However, if Al is used to deoxidize ultra-low carbon steel with a lot of dissolved oxygen, alumina (Al 2 o 3 ), they aggregate and combine to produce a large number of coarse aggregates (clusters) of hundreds of μm or more. [0003] When a part of the alumina aggregates enters the submerged nozzle from the tundish during continuous casting and adheres to the inner hole of the submerged nozzle, the nozzle is clogged and operation is hindered. In addition, if alumina aggregates penetrate into the mold and remain on the surface of the cast slab, they cause surface defects in the steel sheet and adversely affect the quality. [0004] As a countermeasure, there is genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/00B22D11/10C21C7/04
CPCC21C7/072C21C7/068B22D11/117B22D11/108B22D41/58C21C7/0006Y02P10/20
Inventor 宫崎雅文松泽玲洋笹井胜浩大桥渡大谷康彦山田胜范土岐正弘平田刚木村欣晃长谷川一
Owner NIPPON STEEL CORP
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