Double-slag converter process for producing high carbon low-phosphorus molten steel

A double-slag method and converter technology, applied in the manufacture of converters, etc., can solve the problems of restricting converter capacity, increasing investment in molten iron pretreatment equipment and production costs, and difficulty in the production organization of the double-link method, so as to save equipment investment and cost The effect of reducing consumption and reducing production cost

Inactive Publication Date: 2007-07-11
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

Based on the dual purpose of improving quality and reducing cost, it is an extremely effective means to produce high-carbon and low-phosphorus molten steel by using high-carbon tapping process, but there are certain disadvantages in the above two high-carbon tapping processes. Dephosphorization pretreatment of molten iron The process greatly increases the equipment investment and production cost of molten iron pretreatment, while the duplex method not only makes production organization difficult, but also restricts the capacity of the converter

Method used

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Examples

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Embodiment

[0017] Embodiment: high-silicon and high-phosphorus molten iron is sent into the top-bottom composite blowing converter, and the following steps are carried out:

[0018] (1) One-time dephosphorization and slagging in the early stage of blowing: Add 50% to 60% of the total amount of slagging materials into the converter. When performing blowing operations, first use a low lance position of 1.4m and 3.0Nm per ton of molten steel 3 Oxygen flow rate per minute to increase the stirring intensity of the molten pool, which can not only increase the lime melting speed in the early stage, but also reduce the phosphorus content in the molten pool to a low level in the early stage of blowing. After 120-150 seconds, the gun position Raise it to 1.7m while reducing the flow rate of oxygen supply to 2.6Nm per ton of molten steel 3 / min, in order to reduce the heating rate in the early stage of blowing, extend the dephosphorization period, and ensure the dephosphorization effect. The shorte...

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PUM

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Abstract

The invention discloses a rotary furnace technique to manufacture high-carbon low-phosphor molten steel, which is characterized by the following: transmitting high-silicon high-phosphor molten iron into rotary furnace; blowing through gun-change and oxygen-change flow operation; removing phosphor first; pouring rich phosphoric slag at blowing time; adjusting terminal temperature and terminal carbon.

Description

technical field [0001] The invention relates to the field of metallurgical technology, in particular to a technology suitable for producing high-carbon and low-phosphorus molten steel in a converter. Background technique [0002] When the converter produces high-carbon and low-phosphorus molten steel, there are two tapping process modes. One is the low-drawing carbon replenishment process, that is, a large amount of carbon replenishment after low-carbon tapping (the carbon at the end point is between 0.07% and 0.12%); The first is the high-carbon tapping process (end point carbon ≥ 0.30%). The low-drawing carbon process can ensure lower end-point phosphorus, appropriate end-point temperature and relatively stable end-point carbon (stabilized between 0.07% and 0.12%). Its process is relatively stable, so it is adopted by most steel mills. However, in this process, the oxygen content at the end of the melting pool is high, the steel material consumption is high, the alloy yie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30C21C7/064
Inventor 余新河吴健鹏王金平李小明赵继宇高文芳姜茂发钟良材王国平朱跃和邹宗树洪庆海沈继胜吴维轩
Owner 武钢集团有限公司
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