A rh refining method to control the 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 mold flow field instability, billet quality problems, submerged nozzle nodules, etc., and achieve the improvement of nozzle nodules, The effect of saving pouring costs and alleviating the problem of nozzle nodules

Active Publication Date: 2020-12-15
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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  • A rh refining method to control the wettability of inclusions in low carbon aluminum killed steel

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Embodiment 1

[0034] This 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 in an electric furnace or a converter, and the tapping process adopts quiet tapping. When 1 / 5 of the steel is tapped, add a deoxidizer with an aluminum content of 40% and an iron content of 60%. The deoxidizer is a deoxidizer based on an inorganic matrix. The ratio of 70kg of deoxidizer is added.

[0036] 2. When 2 / 5 of the steel is tapped, small lime with a calcium oxide content of 85% is added, the particle size of the 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 the molten steel is less than or equal to 650ppm, and the amount of lime added is 2.5kg / ton of steel.

[0037] 3. When the RH enters the station, turn on the b...

Embodiment 2

[0058] This 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 in an electric furnace or a converter, and the tapping process adopts quiet tapping. When 2 / 5 of the steel is tapped, add a deoxidizer with an aluminum content of 50% and an iron content of 50%. The deoxidizer is a deoxidizer based on an inorganic matrix. The ratio of 90kg of deoxidizer is added.

[0060] 2. When 2 / 5 of the steel is tapped, small lime with a calcium oxide content of 90% is added, the particle size of the 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 800ppm, which is greater than 650ppm, and the amount of lime is added according to the ratio of 3+(800-650) / 100=4.5kg / ton of steel.

[0061] 3....

Embodiment 3

[0068] This 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 in an electric furnace or a converter, and the tapping process adopts quiet tapping. When 2 / 5 of the steel is tapped, add a deoxidizer with an aluminum content of 75% and an iron content of 25%. The deoxidizer is a deoxidizer based on an inorganic matrix. The ratio of 55kg of deoxidizer is added.

[0070] 2. When 2 / 5 of the steel is tapped, small lime with a calcium oxide content of 80% is added, the particle size of the 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 950ppm, which is greater than 650ppm, and the amount of lime is added according to the ratio of 2+(950-650) / 100=5kg / ton of steel.

[0071] 3. W...

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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 an RH refining method for controlling the wettability of inclusions in low-carbon aluminum-killed steel, and belongs to the technical field of steelmaking in the 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 steel, is one of the main problems affecting the cleanliness of molten steel and the quality of final products. Thanks Al 2 o 3 The wetting angle between inclusions and molten steel is 135°, and the interface energy between the two is relatively large, which objectively leads to Al 2 o 3 Inclusions have poor wettability with molten steel, and Al 2 o 3 There is a tendency of spontaneous aggregation. On the one hand, it is easy to cause nodulation of the continuous casting submerged nozzle (SEN), and change the internal size of the nozzle. When the molten steel enters th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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