Deoxidation process for H08 steel-grade silicon

A technology of steel grade and process, applied in the field of H08 steel grade silicon deoxidation process, can solve the problems of high price of aluminum deoxidizer, blocked flocculation at the nozzle, low cleanliness of molten steel, etc., to reduce the difficulty of removing inclusions, reduce alloy costs, The effect of improving the purity of molten steel

Inactive Publication Date: 2017-05-24
BENGANG STEEL PLATES
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  • Abstract
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Problems solved by technology

[0004] Due to the high oxygen content of molten steel at the end of the converter, the converter and LF all use aluminum deoxidizers for deoxidation, and the Al in molten steel 2 o 3 There are many deoxidati

Method used

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  • Deoxidation process for H08 steel-grade silicon
  • Deoxidation process for H08 steel-grade silicon
  • Deoxidation process for H08 steel-grade silicon

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Embodiment 1

[0018] (1) The molten steel composition is designed as follows:

[0019]

[0020] ①This series of steel grades is based on the carbon content range requirements of different steel grades. The oxygen content of the steel at the end of the converter is ≥ 500ppm, and the temperature at the end is controlled at 1650°C as much as possible. Keep the end point temperature, and there is serious peroxidation phenomenon in molten steel;

[0021] ② No other deoxidizers and alloys are added during the tapping process of the converter;

[0022] ③ During the tapping process, ferrosilicon is added for pre-deoxidation, and the reference dosage is 18kg deoxidation 100ppm (Note: 150t molten steel);

[0023] ④According to the target oxygen requirements of different GK steel types, use ferrosilicon to deoxidize to the target range, refer to the following:

[0024]

[0025] ⑤The argon station or LF furnace is used for deoxidation and alloying again, and the target oxygen and composition ar...

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Abstract

The invention relates to a deoxidation process for H08 steel-grade silicon, and belongs to the technical field of steel refining furnace external refining processes. The deoxidation process is characterized in that when oxygen content of molten steel at a converter endpoint is higher than upper limit of a steel tapping target, a converter can adopt part of silicon iron to replace an aluminum deoxidant to perform pre-deoxidation, and therefore, requirements of steel-grade silicon components are relatively low; and converter silicon iron adding time and adding amount must be strictly controlled to further achieve the silicon iron deoxidation effect and guarantee steel-grade components to be qualified, so that quantity of Al2O3 impurities generated by aluminum alloy deoxidation is reduced, impurity removal difficulty can be effectively reduced, degree of purity of molten steel is improved, and castability of molten steel is improved, and therefore, alloy cost is reduced.

Description

technical field [0001] The invention relates to a silicon deoxidation process for H08 steel, and belongs to the technical field of refining processes outside a steelmaking furnace. Background technique [0002] The traditional process of H08 series steel is to use aluminum iron and aluminum wire for deoxidation in the steelmaking process. The advantage of using aluminum deoxidation method is that the grain size is finer and the performance is better, but the removal of inclusions is relatively difficult, especially in the later stage of smelting. With aluminum deoxidation, it is very difficult to remove the fine inclusions produced. During the casting process, due to Al 2 o 3 The accumulation of inclusions on the nozzle wall can easily lead to blockage of the continuous casting nozzle. At the same time, due to the higher price of aluminum, the production cost is higher. If the partial silicon deoxidation process is used for the steel grades that do not require [Al] in the...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06C21C7/0006
Inventor 刘真海王健
Owner BENGANG STEEL PLATES
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