Smelting method of converter efficient dephosphorization

A smelting method and converter technology, which is applied in the field of iron and steel metallurgy, can solve the problems of not being able to effectively improve the dephosphorization efficiency of the converter, and cannot reduce the phosphorus content and cost at the end of the converter, and achieve low cost, low phosphorus content, and improved dephosphorization efficiency. Effect

Active Publication Date: 2016-06-15
SHOUGANG CORPORATION
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Problems solved by technology

[0003] The invention provides a smelting method for high-efficiency dephosphorization of a converter, which solves or partially solves the technical problems in the prior art that

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  • Smelting method of converter efficient dephosphorization

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Embodiment Construction

[0012] see figure 1 The embodiment of the present invention provides a high-efficiency converter dephosphorization smelting method, which is mainly used for smelting molten iron with a mass fraction of phosphorus of 0.080-0.200%, and finally reaching steel grades with a mass fraction of phosphorus of less than 0.010% in the finished product. Suitable for 180-250 ton converters, the smelting method includes the following steps:

[0013] Step 1, carry out slag splashing to protect the furnace, and pour out the residual slag.

[0014] Step 2, adding pre-melted slag into the furnace.

[0015] Step 3: Carry out converter blowing for 4-5 minutes, and the oxygen lance position and oxygen supply intensity are dynamically adjusted according to the blowing time.

[0016] Step 4, carry out the slag dumping operation.

[0017] Step 5: Carry out slagging and blowing, and control the basicity R of slag, the mass fraction of magnesium oxide and the mass fraction of ferrous oxide at the en...

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Abstract

The invention discloses a smelting method of converter efficient dephosphorization and belongs to the technical field of ferrous metallurgy. The smelting method of converter efficient dephosphorization comprises the following steps that after the last time of converter steel tapping, slag splashing furnace protection is conducted, and residual slag is poured out; before converter blowing is started, pre-melted slag is added into a converter; converter blowing is conducted for 4-5 minutes, the oxygen lance position and the oxygen supply intensity are adjusted dynamically according to blowing time; slag pouring operation is conducted; and slag-forming blowing is conducted, at the converter endpoint, the slag basicity R, the mass fraction of magnesium oxide and the mass fraction of ferrous oxide are controlled, and finished steel of which the phosphorus mass fraction is required to be 0.010% or below is obtained. Through the smelting method of converter efficient dephosphorization, the converter dephosphorization efficiency can be effectively improved, the phosphorus content at the converter endpoint is lowered, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a smelting method for high-efficiency dephosphorization of a converter. Background technique [0002] With the gradual decline in the quality of ore raw materials, the phosphorus content in molten iron is getting higher and higher. At the same time, the user's requirements for product quality are also gradually increasing, and the restrictions on P in finished steel are becoming more and more stringent. For example, the requirements for P in ordinary steel products are all below 0.015%, and the requirements for automotive plates and pipeline steels require P≤0.01 %, steel plates under special corrosion-resistant conditions even require P≤0.005%, which brings great challenges to converter dephosphorization. In order to produce low-phosphorus steel, the main processes currently used for the production process using the ordinary converter process include: (1) the ...

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Application Information

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IPC IPC(8): C21C7/064C21C5/28
CPCC21C5/28C21C7/064Y02P10/20
Inventor 赵东伟李海波高攀刘风刚王东孙亮张勇马文俊刘国梁苑鹏罗衍昭杨文静陈建光刘道正
Owner SHOUGANG CORPORATION
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