Dephosphorising flux for molten steel

A dephosphorization and flux technology, applied in the field of dephosphorization flux, can solve the problems of low dephosphorization efficiency and weak phosphorus fixation ability, and achieve the effect of high dephosphorization efficiency, strong phosphorus tolerance and wide source

Inactive Publication Date: 2008-01-16
SHOUGANG CORPORATION
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the difference between molten steel composition and temperature and molten iron, these molten iron dephosphorization fluxes have low dephosphorization efficiency when used for molten steel dephosphorization, and are not suitable for molten steel dephosphorization, which is mainly related to the ratio of dephosphorization flux: (1 ) The content of iron oxide in the molten iron dephosphorization flux is relatively high, while the silicon in the tapping water is trace amount, and the phosphorus is often less than 0.02%. Iron oxide content; (2) The lime content in the molten iron dephosphorization flux is low, and the phosphorus content in the molten steel is low. To transfer phosphorus from the molten steel to the slag and to exist stably in the slag, the slag needs to have a strong Phosphorus fixation ability, the phosphorus fixation ability of this molten iron dephosphorization flux with lower lime content is weak

Method used

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Examples

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Embodiment Construction

[0019] In order to clearly illustrate the composition of the present invention and its implementation effect, the embodiment and implementation effect of a 100 kg induction furnace are provided, as shown in Table 1. In a 100 kg induction furnace, load 100 kg of steel material. When the molten steel melts and reaches 1620 ° C, add 2 kg of the dephosphorization flux shown in Table 1 to the surface of the molten steel. The dephosphorization effect is shown in Table 1.

[0020] Table 1: Embodiment and implementation effect of 100 kg induction furnace

[0021] Dephosphorization flux composition % (weight percent)

[0022] See Table 2 for the examples and implementation effects of large-scale industrial production. During the tapping process of the converter, the dephosphorization flux shown in Table 2 was added to the steel flow according to the addition amount of 12 kg / ton of steel, and the dephosphorization effect is shown in Table 2.

[0023] Table 2: Examples and i...

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Abstract

The invention relates to a dephosphorization flux to produce low phosphorus, ultra low phosphorus steel by out-of-furnace dephosphorization to deal with molten steel. The invention consists (weight percent): lime 60 to 75 percent, fluorite 10 to 25 percent and iron oxides 0 to 20percent. The invention is characterized in strong phosphorus dissolution capacity, high dephosphorization efficiency and stable dephosphorization effect, with extensive sources of raw materials of dephosphorization flux which can obtain easily. The dephosphorization flux is adopted by mixing during the tapping process, which can produce flexibly low phosphorus, ultra low phosphorus steel with phosphorus content less than 0.01percent, 0.005 percent or 0.002percent.

Description

technical field [0001] The invention relates to a dephosphorization flux for molten steel dephosphorization in the metallurgical industry, in particular to a dephosphorization flux for producing low-phosphorus and ultra-low-phosphorus steel. Background technique [0002] Phosphorus is usually controlled as a harmful element in steel, because the segregation of phosphorus in steel is relatively serious, which will deteriorate the toughness of steel and cause "cold brittleness", especially at low temperature conditions, it is more likely to occur "cold brittleness". The segregation of the steel will also cause the anisotropy of the steel, reduce the welding performance, and cause corrosion fatigue of the stainless steel. With the rapid development of science and technology, high-grade high-quality steel has continuously improved the quality requirements of steel products, especially for the content of sulfur and phosphorus in steel. Some low-temperature steels, marine steels,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 田志红
Owner SHOUGANG CORPORATION
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