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RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel

A low-carbon aluminum-killed steel and inclusion technology, which is applied in the steelmaking field of the metallurgical industry, can solve problems such as billet quality problems, crystallizer flow field instability, submerged nozzle nodules, etc., to save pouring costs, nozzle The effect of improving and alleviating the problem of nodulation in the nozzle

Active Publication Date: 2019-04-05
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a RH refining method for controlling the wettability of inclusions in low-carbon aluminum-killed steel, which overcomes the Al 2 o 3 Spontaneous accumulation of inclusions leads to nodules in the submerged nozzle during continuous casting, and the resulting instability of the mold flow field, and the quality of the slab caused by the spontaneous aggregation and growth of inclusions during solidification

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  • RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel

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Embodiment 1

[0034] The present embodiment provides a RH refining method for controlling the wettability of inclusions in low carbon aluminum killed steel, the steps of which include:

[0035] 1. The molten steel is smelted by electric furnace or converter, and the tapping process adopts sedated tapping. When 1 / 5 of the steel is tapped, a deoxidizer with an aluminum content of 40% and an iron content of 60% is added. The deoxidizer is a deoxidizer with an inorganic matrix as the main body. The deoxidizer is added according to [O] per 100ppm in the steel. The proportion of 70kg of deoxidizer was added.

[0036] 2. When tapping 2 / 5, add small lime with calcium oxide content of 85%, the particle size of small lime is controlled at 10-30mm, and the activity is ≥350ml / L. Adjust the amount of lime added according to the oxygen content in the steel when tapping. In this embodiment, the oxygen content of molten steel is less than or equal to 650ppm, and the amount of lime added is added at a rat...

Embodiment 2

[0058] The present embodiment provides a RH refining method for controlling the wettability of inclusions in low carbon aluminum killed steel, the steps of which include:

[0059] 1. The molten steel is smelted by electric furnace or converter, and the tapping process adopts sedated tapping. When 2 / 5 of the steel is tapped, a deoxidizer with an aluminum content of 50% and an iron content of 50% is added. The deoxidizer is a deoxidizer with an inorganic matrix as the main body. The deoxidizer is added according to [O] per 100ppm in the steel. The proportion of 90kg of deoxidizer was added.

[0060] 2. When tapping 2 / 5, add small lime with calcium oxide content of 90%, the particle size of small lime is controlled at 10-30mm, and the activity is ≥350ml / L. Adjust the amount of lime added according to the oxygen content in the steel when tapping. In this embodiment, the oxygen content of molten steel is 800 ppm, which is greater than 650 ppm, and the amount of lime added is adde...

Embodiment 3

[0068] The present embodiment provides a RH refining method for controlling the wettability of inclusions in low carbon aluminum killed steel, the steps of which include:

[0069] 1. The molten steel is smelted by electric furnace or converter, and the tapping process adopts sedated tapping. When 2 / 5 of the steel is tapped, a deoxidizer with an aluminum content of 75% and an iron content of 25% is added. The deoxidizer is a deoxidizer with an inorganic matrix as the main body. The deoxidizer is added according to [O] per 100ppm in the steel. The ratio of 55kg of deoxidizer was added.

[0070] 2. When tapping 2 / 5, add small lime with calcium oxide content of 80%, the particle size of small lime is controlled at 10-30mm, and the activity is ≥350ml / L. Adjust the amount of lime added according to the oxygen content in the steel when tapping. In this embodiment, the oxygen content of molten steel is 950 ppm, which is greater than 650 ppm, and the amount of lime added is added at ...

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Abstract

The invention provides an RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel. Through controlling the components, the adding time, the adding amount and the adding mode of an inclusion modifier, and in cooperation of the vacuum degree control and process adjustment in the RH refining process, so that the surface of the aluminum oxide inclusions is completely covered or partially covered with 2Al-2 O-3.CaO and 6Al-2 O-3.CaO, and the modified form of the inclusions is surface modification or local surface modification. On the basis of controlling thevacuum degree of RH refining, the yield of the modifier can be improved, and the problem of molten steel pollution caused by the modifier is reduced. On the basis that the refining process and the period are not influenced, the surface wettability of the aluminum oxide inclusions in the molten steel is improved. The problem of water opening nodulation in the continuous casting process can be relieved, and the problem of liquid level abnormal fluctuation caused by the water opening nodulation is avoided; and the problem of aggregation of the aluminum oxide inclusions in the solidification process of the molten steel is relieved, so that the cleanliness of the molten steel is improved, and the product quality of the low-carbon aluminum killed steel is improved.

Description

technical field [0001] The invention relates to a RH refining method for controlling the wettability of inclusions in low-carbon aluminum killed steel, and belongs to the technical field of steelmaking in metallurgical industry. Background technique [0002] The common inclusion composition in low carbon aluminum killed steel is Al 2 O 3 , accounting for more than 90% of the number of inclusions in the steel, which is one of the main problems affecting the cleanliness of molten steel and the quality of the final product. due to Al 2 O 3 The wetting angle between the inclusions and the molten steel is 135°, and the interfacial energy between the two is relatively large, which objectively causes the Al 2 O 3 Inclusions have poor wettability with molten steel, and Al during continuous slab casting and molten steel solidification 2 O 3 There is a tendency of spontaneous aggregation. On the one hand, it is easy to cause nodules in the continuous casting submerged nozzle (S...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10C21C7/00
CPCC21C7/0006C21C7/06C21C7/10
Inventor 王雷川潘宏伟黄财德赵长亮袁天祥安超孟德伟罗磊季晨曦单伟贾刘兵张博张伟龙
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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