Method for smelting high-carbon and low-phosphorus steel by utilizing converter at low temperature

A low-phosphorus steel, low-temperature technology, applied in the manufacture of converters and other directions, can solve the problems of difficult synchronization of smelting end points, affecting the P removal efficiency of the converter, and weakening the stirring of the molten pool, so as to shorten the pure oxygen supply time and improve the production efficiency of the converter. , the effect of reducing alloy consumption

Inactive Publication Date: 2015-09-16
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to achieve high [C], low [P], and higher temperatures at the smelting end point simultaneously. To achieve 100% high [C], low [P], and higher temperatures at the smelting end point, almost no iron and steel enterprise can do it.
High [C] tapping at the end point of smelting requires reducing the oxygen supply of the converter. In actual smelting op...

Method used

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  • Method for smelting high-carbon and low-phosphorus steel by utilizing converter at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Control in the early stage of blowing (ie Si, Mn oxidation period). The time limit is 0 to 4 minutes when blowing is started, and the operation is as follows:

[0032] The oxygen lance is ignited, the opening position of the blowing lance is 1200mm, and the flow rate of the oxygen lance is controlled at 30000Nm 3 / h (the flow rate in the early stage of blowing is constant), the gun position is adjusted to 1350mm 1min after the start of blowing, and lime 40Kg / t steel, magnesium ball 10Kg / t steel, light burnt dolomite 7Kg / t steel, ore 5Kg / t steel are added at the same time , The dosage of fluorite is 3Kg / t steel. Add lime 5Kg / t steel, light-burned dolomite 4Kg / t steel, ore 2Kg / t steel at 1.5 minutes of blowing, Si and Mn oxidation period ends at 4 minutes of blowing, and the temperature at the end of the early stage of blowing is 1410 °C.

[0033] 2) Mid-term blowing control. The time limit is 4 to 13 minutes after blowing, and the operation is as follows:

[0034]...

Embodiment 2

[0038] 1) Control in the early stage of blowing (ie Si, Mn oxidation period). The time limit is 0 to 4 minutes when blowing is started, and the operation is as follows:

[0039] The oxygen lance is ignited, the opening position of the blowing lance is 1250mm, and the flow rate of the oxygen lance is controlled at 30500Nm 3 / h (the flow rate in the early stage of blowing is constant), the gun position is adjusted to 1370mm 1min after blowing is started, and lime 42Kg / t steel, magnesium ball 10Kg / t steel, light-burned dolomite 10Kg / t steel, ore 6Kg / t steel are added at the same time , Fluorite dosage 4Kg / t steel. Add lime 6Kg / t steel, light burnt dolomite 5Kg / t steel, and ore 2.2Kg / t steel at 2 minutes of blowing, Si and Mn oxidation period ends at 4 minutes of blowing, and the temperature at the end of the early stage of blowing is 1400 °C.

[0040] 2) Mid-term blowing control. The time limit is 4 to 13 minutes after blowing, and the operation is as follows:

[0041] Oxygen...

Embodiment 3

[0045] 1) Control in the early stage of blowing (ie Si, Mn oxidation period). The time limit is 0 to 4 minutes when blowing is started, and the operation is as follows:

[0046] The oxygen lance is ignited, the opening position of the blowing lance is 1270mm, and the flow rate of the oxygen lance is controlled at 31000Nm 3 / h (the flow rate in the early stage of blowing is constant), the gun position is adjusted to 1400mm 1min after the start of blowing, and at the same time, add lime 43Kg / t steel, magnesium ball 10Kg / t steel, light burnt dolomite 10Kg / t steel, ore 6Kg / t steel , Fluorite dosage 4Kg / t steel. Add lime 6Kg / t steel, light burnt dolomite 5Kg / t steel, and ore 2.5Kg / t steel when blowing starts for 1min50s, Si and Mn oxidation period ends at 4min blowing, and the temperature at the end of the early stage of blowing is 1390°C.

[0047] 2) Mid-term blowing control. The time limit is 4 to 13 minutes after blowing, and the operation is as follows:

[0048] Oxygen lanc...

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Abstract

The invention discloses a method for smelting high-carbon and low-phosphorus steel by utilizing a converter at a low temperature. The method for smelting the high-carbon and low-phosphorus steel by utilizing the converter at the low temperature comprises the following steps: (1) carrying out blowing prophase control; (2) carrying out blowing metaphase control; and (3) carrying out blowing anaphase control. The method for smelting the high-carbon and low-phosphorus steel by utilizing the converter at the low temperature has the advantages that low temperature tapping is adopted, the problem that end points [C] and [P] can not meet tapping conditions at the same time can be effectively solved, furnace life of the converter can be improved, and refractory material consumption is directly reduced; a single slag process is adopted for slag-making, a process route is simple, safety and operability are strong, and easy control is realized; high tapping at the end point [C] is realized, oxygen content during tapping is reduced, and alloy consumption is reduced while quality of molten steel is improved; and pure oxygen supply time of the converter can be shortened by about 2 minutes, so that production efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for smelting high-carbon and low-phosphorus steel in a converter at low temperature. Background technique [0002] When the converter smelts high-carbon steel varieties, the smelting end point control targets are high [C], low [P] and higher temperature. Generally, the end point temperature should be controlled at least above 1630 °C. However, it is difficult to achieve high [C], low [P], and higher temperatures at the smelting end point simultaneously. To achieve 100% high [C], low [P], and higher temperatures at the smelting end point, almost no iron and steel enterprise can do it. . High [C] tapping at the smelting end point requires reducing the oxygen supply of the converter. In actual smelting operations, lowering the oxygen supply intensity and increasing the position of the blowing gun are often used to achieve high [C] tapping, but reducing th...

Claims

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Application Information

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IPC IPC(8): C21C5/32C22C33/04
Inventor 汪晛黄道昌吴本胜方建红李相付
Owner 武钢集团有限公司
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