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Pre-fused compound dephosphorizer, preparation method of pre-fused compound dephosphorizer and method for smelting ultralow phosphorous steel

A composite dephosphorization agent and ultra-low phosphorus steel technology, which is applied in the smelting field of low phosphorus steel, can solve the problems of high unit consumption in the treatment process, reduced scrap steel amount, and many equipments required, and achieves simple preparation process and reduced smelting cost. , the effect that is beneficial to use

Inactive Publication Date: 2017-05-17
上海盛宝冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantages are the need for more equipment, large investment, high unit consumption in the treatment process, and large temperature drop, and because the temperature of molten iron after "three removals" is low, the amount of scrap steel added during converter smelting is greatly reduced.
Although this method can control the phosphorus content after dephosphorization to less than 0.0030%, it needs to go through two dephosphorization processes: outlet dephosphorization and final dephosphorization, and it also needs to use the method of feeding cored wire for deep dephosphorization. complex and expensive

Method used

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  • Pre-fused compound dephosphorizer, preparation method of pre-fused compound dephosphorizer and method for smelting ultralow phosphorous steel

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of pre-melted composite dephosphorization agent:

[0038] Ferric oxide (Fe 2 o 3 ) and ferrous oxide (FeO) mixture 400kg; calcium oxide (CaO) 450kg; aluminum oxide (Al 2 o 3 ) 40kg; silicon dioxide (SiO 2 ) 30kg; magnesium oxide (MgO) 20kg; calcium fluoride (CaF 2 ) 60kg after pulverization, mixing and / or pelletizing, melting at a high temperature of 1100°C~1600°C, cooling and crushing, and processing to obtain 950kg of premelted composite dephosphorization agent for converter tapping with a particle size of 10~20mm.

[0039] (2) Smelting ultra-low phosphorus steel:

[0040] The tapping temperature of the converter is controlled between 1560°C and 1660°C, the phosphorus content is controlled below 0.02% when tapping, and the slag blocking treatment is carried out by using non-deoxidation and sliding plate slag blocking technology; the steel is uniform from the beginning of tapping to the end of tapping. Add pre-melted composite dephosphorizing agen...

Embodiment 2

[0042] (1) Preparation of pre-melted composite dephosphorization agent:

[0043] Ferric oxide (Fe 2 o 3 ) and ferrous oxide (FeO) mixture 450kg; calcium oxide (CaO) 400kg; aluminum oxide (Al 2 o 3 ) 20kg; silicon dioxide (SiO 2 ) 30kg; magnesium oxide (MgO) 20kg; calcium fluoride (CaF 2 ) 80kg after pulverization, mixing and / or pelletizing, melting at a high temperature of 1100°C~1600°C, cooling and crushing, and processing to obtain 960kg of premelted composite dephosphorization agent for converter tapping with a particle size of 15~20mm.

[0044] (2) Smelting ultra-low phosphorus steel:

[0045] The tapping temperature of the converter is controlled between 1560°C and 1660°C, the phosphorus content is controlled below 0.02% when tapping, and the slag blocking treatment is carried out by using non-deoxidation and sliding plate slag blocking technology; the steel is uniform from the beginning of tapping to the end of tapping. Add pre-melted composite dephosphorization ag...

Embodiment 3

[0047] (1) Preparation of pre-melted composite dephosphorization agent:

[0048] Ferric oxide (Fe 2 o 3 ) and ferrous oxide (FeO) mixture 500kg; calcium oxide (CaO) 350kg; aluminum oxide (Al 2 o 3 ) 40kg; silicon dioxide (SiO 2 ) 30kg; magnesium oxide (MgO) 20kg; calcium fluoride (CaF 2 ) 60kg after crushing, mixing and / or pelletizing, melting at a high temperature of 1100°C~1600°C, cooling and crushing, and processing to obtain 950kg of premelted composite dephosphorization agent for converter tapping with a particle size of 12~18mm.

[0049] (2) Smelting ultra-low phosphorus steel:

[0050] The tapping temperature of the converter is controlled between 1560°C and 1660°C, the phosphorus content is controlled below 0.02% when tapping, and the slag blocking treatment is carried out by using non-deoxidation and sliding plate slag blocking technology; the steel is uniform from the beginning of tapping to the end of tapping. Add pre-melted composite dephosphorizing agent to ...

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Abstract

The invention relates to the field of smelt low-phosphorous steel, in particular to pre-fused compound dephosphorizer. The pre-fused compound dephosphorizer is composed of, by weight percent, 30%-60% of a mixture of iron sesquioxide (Fe2O3) and ferrous oxide (FeO), 20%-50% of calcium oxide (CaO), 0%-10% of aluminum oxide (Al2O3), 0%-10% of silicon dioxide (SiO2), 0%-10% of magnesium oxide (MgO), 5%-30% of calcium fluoride (CaF2) and unavoidable impurities. The invention also relates to a preparation method of the pre-fused compound dephosphorizer. The invention further relates to a method for smelting ultralow phosphorous steel. The dephosphorizing rate of the pre-fused compound dephosphorizer can reach 80% or above, and the phosphorous content in liquid steel can be controlled within 0.003%.

Description

technical field [0001] The invention relates to the field of low-phosphorus steel smelting, in particular to a pre-melted composite dephosphorization agent and a preparation method thereof. The invention also relates to a method for smelting ultra-low phosphorus steel. Background technique [0002] In the smelting process of iron and steel, phosphorus is usually regarded as a harmful element and needs to be controlled. Because the segregation of phosphorus in steel is relatively serious, the toughness of steel is deteriorated, resulting in "cold brittleness", especially under low temperature conditions, it is more likely to occur "cold brittleness". [0003] In order to avoid cold and brittle phenomena when using or processing steel under low temperature and cold conditions, the phosphorus in steel should generally be controlled below 0.012%. The phosphorus in pure steel and ultra-low phosphorus steel must be controlled below 0.005%. [0004] To achieve this goal, most st...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 刘欣隆孙树森周四明聂爱军
Owner 上海盛宝冶金科技有限公司
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