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Phosphorus-containing steel converter smelting method

A converter smelting and converter technology, applied in the manufacture of converters, etc., can solve the problems of increasing the consumption of lime per ton of steel, prolonging the smelting time, and increasing the iron loss, so as to reduce smelting production costs, save phosphorus alloy resources, and improve molten steel The effect of temperature

Active Publication Date: 2013-03-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are: due to the addition of ferrophosphorus for alloying when tapping the steel, the recovery rate of phosphorus is low, which increases the consumption of ferrophosphorus; when the converter slag is made, a large amount of lime is added, which not only increases the consumption of lime per ton of steel, but also The amount of iron loss in the slag is increased, and the addition of scrap steel is limited, which greatly increases the smelting cost and prolongs the smelting time

Method used

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  • Phosphorus-containing steel converter smelting method
  • Phosphorus-containing steel converter smelting method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] 260 tons of converters smelt phosphorus-containing steels, and the content of phosphorus in molten iron is 0.101% by weight.

[0028] 1. After mixing the molten iron into the converter and adding scrap steel, the position of the oxygen lance is controlled at 2.6 meters from the liquid level of the molten pool, and oxygen is supplied to the molten iron in the converter, and the oxygen supply intensity is controlled at 3.5 m 3 / t.min; at the end of blowing, the position of the oxygen lance is controlled at 2 meters from the liquid surface of the molten pool until the end of blowing.

[0029] 2. The silicon content of molten iron is controlled at 0.37% by weight.

[0030] 3. In the early stage of converter blowing, according to the silicon content of molten iron, 5,800 kg of light-burned dolomite, 4,300 kg of activated lime, and 470 kg of bauxite were added to the converter.

[0031] 4. The basicity of slag is controlled at 2.7.

[0032] The result is: the temperature at...

Embodiment 2

[0034] 260 tons of converters smelt phosphorus-containing steels, and the content of phosphorus in molten iron is 0.098% by weight.

[0035] 1. After mixing the molten iron into the converter and adding scrap steel, the position of the oxygen lance is controlled at 2.45 meters from the liquid level of the molten pool, and oxygen is supplied to the molten iron in the converter, and the oxygen supply intensity is controlled at 3.0m 3 / t.min; at the end of blowing, the position of the oxygen lance is controlled at 2 meters from the liquid surface of the molten pool until the end of blowing.

[0036] 2. The silicon content of molten iron is controlled at 0.46% by weight.

[0037] 3. In the early stage of converter blowing, according to the silicon content of molten iron, 7000 kg of light-burned dolomite, 5800 kg of activated lime and 620 kg of bauxite were added to the converter.

[0038] 4. The basicity of slag is controlled at 2.6.

[0039] The result is: the end point tempera...

Embodiment 3

[0041] 260 tons of converters smelt phosphorus-containing steels, and the content of phosphorus in molten iron is 0.11% by weight.

[0042] 1. After the molten iron is mixed into the converter and scrap steel is added, the position of the oxygen lance is controlled at 2.3 meters from the liquid level of the molten pool, and oxygen is supplied to the molten iron in the converter, and the oxygen supply intensity is controlled at 4.0m 3 / t.min; at the end of blowing, the position of the oxygen lance is controlled at 2 meters from the liquid surface of the molten pool until the end of blowing.

[0043] 2. The silicon content of molten iron is controlled at 0.62% by weight.

[0044] 3. In the early stage of converter blowing, according to the silicon content of molten iron, 8,200 kg of light-burned dolomite, 7,200 kg of activated lime, and 260 kg of bauxite were added to the converter.

[0045] 4. The basicity of slag is controlled at 2.75.

[0046] The result is: the end point t...

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Abstract

The invention provides a phosphorus-containing steel converter smelting method. The lance position and the oxygen supply intensity of an oxygen lance, and the content of silicon in molten iron are controlled, and lightly calcined dolomite, active lime, and bauxite slagging materials and slugging materials are added to a converter according to the content of silicon in the molten iron in early-stage converter blowing to control the slag alkalinity, so the addition amount of the active lime in the smelting process is greatly reduced, the consumption of ton steel lime is reduced, the scrap ratio is effectively increased, and the loss of iron in the slag is reduced, thereby the smelting production cost is substantially reduced. Simultaneously the addition amounts of phosphorus and iron in steel tapping alloying are reduced, so the phosphorus alloy resource is saved; and the temperature decrease in the converter steel tapping process is reduced, and the temperature of the molten iron is corresponding improved, so phosphorus at the terminal point is increased.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, and in particular relates to a method for smelting phosphorus-containing steel in a converter. Background technique [0002] The so-called phosphorus-containing steel generally refers to special steel types containing phosphorus, mainly including container plates, and the phosphorus content of the finished product is generally between 0.07-0.11%. Under normal circumstances, the smelting method of this type of steel is no different from that of other common steel types, and the final phosphorus content is controlled at about 0.01-0.2%. Then iron phosphorus is added during tapping and alloying, and dephosphorization is a major task in the current converter smelting process. The main problems are: due to the addition of ferrophosphorus for alloying when tapping the steel, the recovery rate of phosphorus is low, which increases the consumption of ferrophosphorus; when the converter slag is made...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
Inventor 郭猛孙艳霞王鹏张越王文科张志文毛志勇
Owner ANGANG STEEL CO LTD