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

A converter and high-carbon technology, which is applied in the manufacture of converters, etc., can solve the problems of increasing investment in molten iron pretreatment equipment and production costs, restricting converter capacity, and the difficulty of duplex production organization. Effect of cost reduction and production cost reduction

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

Experimental program
Comparison scheme
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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 slag dephosphorization in the early stage of blowing: Add 45% to 55% of the total amount of slagging materials into the converter. When blowing, first use a low lance position of 1.4m and 3.0Nm per ton of molten steel 3 / min oxygen supply flow for blowing operation to increase the stirring intensity of the molten pool, after 110-140 seconds, raise the gun position to 1.7m, and at the same time reduce the oxygen supply flow rate to 2.6Nm per ton of molten steel 3 / min, in order to reduce the temperature rise rate in the early stage of blowing, ensure effective dephosphorization in the early stage, and lay the foundation for efficient dephosphorization in the middle and late stages. The temperature of the molten pool is 1350-1450°C, the basicity of the slag is between 2.0-2.5, and the iron oxide co...

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Abstract

The invention discloses a manufacturing method of high-carbon low-phosphor molten steel of rotary furnace in the metallurgical technical domain, which comprises the following steps: transmitting high-silicon high-phosphoric molten steel in the rotary furnace; blowing through gun-changing oxygen-changing 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, and specifically refers to a technology suitable for producing high-carbon and low-phosphorus steel by 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 end point carbon is between 0.07 and 0.12%); the other is It is a 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 yield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30C21C7/04
Inventor 吴健鹏李小明王金平易卫东魏海徐永清洪庆海吴维轩
Owner 武钢集团有限公司
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