CN110964877A - Deoxidation control method suitable for smelting low-carbon low-silicon steel by converter - Google Patents
Deoxidation control method suitable for smelting low-carbon low-silicon steel by converter Download PDFInfo
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- CN110964877A CN110964877A CN201911383585.9A CN201911383585A CN110964877A CN 110964877 A CN110964877 A CN 110964877A CN 201911383585 A CN201911383585 A CN 201911383585A CN 110964877 A CN110964877 A CN 110964877A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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Abstract
The invention discloses a deoxidation control method suitable for smelting low-carbon low-silicon steel by a converter, wherein a deoxidation line for producing the low-carbon low-silicon steel adopts a step-by-step operation method of the converter and a ladle to carry out deoxidation: in the early stage of tapping, an aluminum deoxidizer is adopted to carry out precipitation deoxidation on the molten steel in the converter, the deoxidized molten steel in the converter is tapped to a ladle and then is alloyed by secondary deoxidation, and the deoxidation sequence adopts a mode of calcium carbide, low-carbon ferromanganese, aluminum ferromanganese and silicon-calcium alloy from weak to strong; 3) performing data regression fitting according to carbon-oxygen balance theory and deoxidation amount of each alloy element to obtain a quadratic regression equation of step-by-step deoxidation model parameters, formulating an addition amount reference table in each stage by using a mathematical model established by a function, verifying that the oxygen content of the steel ladle can be stably controlled between 15 ppm and 30ppm through on-site production, and meeting the requirements of steel grades such as low-silicon low-carbon steel and the like on fluidity and inclusion morphology directly.
Description
Technical Field
The invention relates to a deoxidation control method suitable for smelting low-carbon low-silicon steel by a converter.
Background
The molten iron phosphorus of eight iron and steel companies Limited in Xinjiang fluctuates between 0.120 and 0.180 percent, and in order to achieve the purpose of dephosphorization, the converter adopts the measures of reducing the end point carbon content, supplementing blowing by high-tension and the like to carry out dephosphorization. However, the total oxygen content in the steel tends to increase by the above operation, and the consumption of the aluminum alloy deoxidation alloy increases. If the deoxidation process adopts the deoxidation process of adding aluminum into steel ladles, the aluminum isStrong deoxidizer, Al is generated by using aluminum alone for deoxidation2O3And Al2O3High melting point up to 2050 deg.C, solid state at molten steel temp., Al2O3When the content is high, the castability of molten steel is poor, a water gap is easy to block, and in addition, Al2O3The steel is an amorphous inclusion, influences the performance of steel, and has certain influence on the stability of production and field operation.
Disclosure of Invention
The invention aims to provide a deoxidation control method suitable for smelting low-carbon low-silicon steel by a converter, which considers the component control and the oxygen content control in the development process according to the process characteristics of the low-carbon low-silicon steel, and improves the casting blank quality and meets the production requirement of the low-carbon low-silicon steel by selecting a reasonable deoxidation process model, stabilizing the components and controlling the free oxygen of a steel ladle.
The invention aims to realize the deoxidation control method suitable for smelting the low-carbon low-silicon steel by the converter, and the deoxidation line for producing the low-carbon low-silicon steel adopts a step-by-step operation method of the converter and a steel ladle to carry out deoxidation:
1) the molten steel in the converter is precipitated and deoxidized by adopting an aluminum deoxidizer in the early stage of tapping, so that the oxygen content of the molten steel is reduced, and partial Al can be adsorbed by slag in the converter2O3Deoxidizing products, reducing the total amount of the deoxidizing products in the ladle;
2) the deoxidized molten steel in the converter is tapped to a ladle and then alloyed by secondary deoxidation, wherein the deoxidation sequence adopts a mode of calcium carbide, low-carbon ferromanganese, aluminum ferromanganese and silicon-calcium alloy from weak to strong;
3) performing data regression fitting according to the carbon-oxygen balance theory and the deoxidation amount of each alloy element to obtain a quadratic regression equation of the parameters of the step-by-step deoxidation model:
【O】steel ladle=848.78+12.68mIn-furnace AlMnFe－4.58mSteel ladle LG+ 7.98mIn-package AlMnFe－33.25mSteel ladle TiFe－
0.06（mIn-furnace AlMnFe）2+ 0.06（mSteel ladle LG）2+ 0.03（mIn-package AlMnFe）2
+0.003（mSteel ladle CaSi）2+0.24（mSteel ladle TiFe）2
In the formula: m isIn-furnace AlMnFeKg representing the amount of added ferromanganese in the furnace
mSteel ladle LGRepresenting the amount of the pre-deoxidizer added into the steel ladle in kg
mIn-package AlMnFeKg representing the added amount of aluminum, manganese and iron in the steel ladle
mSteel ladle CaSiKg representing the added amount of silicon and calcium in the steel ladle
mSteel ladle TiFeKg representing the amount of ferrotitanium added to the ladle
The method comprises the following steps of establishing an addition amount reference table at each stage by using a mathematical model established by a function, verifying that the oxygen content of a steel ladle can be stably controlled between 15 ppm and 30ppm through field production, meeting the requirements of steel grades such as low-silicon low-carbon steel and the like on fluidity and inclusion morphology directly, and using a step-by-step deoxidation reference model as shown in the following table:
silicon-calcium alloy is adopted for silicon preparation, and deoxidation products containing Ca element are utilized to change the form of inclusions and reduce pure Al2O3To improve the castability of molten steel, to produce 12 CaO.7Al2O3The low-melting-point deoxidation product improves the fluidity of molten steel and completely avoids nozzle nodulation;
4) the composition of the inclusions analyzed by a scanning electron microscope on the poured steel sample shows that the point-ball inclusions after the deoxidation treatment of the aluminum alloy and the calcium silicon alloy are mainly 12CaO 7Al2O3The inclusions are small amount of silicate, and most of the inclusions are spherical particles of several micrometers and are uniformly distributed.
The main improvement effect is as follows:
1. compared with the traditional process, the step-by-step deoxidation model used for smelting the low-silicon low-carbon steel can reduce the total oxygen in the steel and improve the non-metallic inclusions by adopting the step-by-step deoxidation model.
2. The step-by-step deoxidation model can meet the production requirement of low-carbon low-silicon steel, and therefore, great potential economic benefit and social benefit are generated.
Detailed Description
A deoxidation control method suitable for smelting low-carbon low-silicon steel by a converter is characterized in that a deoxidation line for producing the low-carbon low-silicon steel adopts a step-by-step operation method of the converter and a ladle to carry out deoxidation:
1) the molten steel in the converter is precipitated and deoxidized by adopting an aluminum deoxidizer in the early stage of tapping, so that the oxygen content of the molten steel is reduced, and partial Al can be adsorbed by slag in the converter2O3Deoxidizing products, reducing the total amount of the deoxidizing products in the ladle;
2) the deoxidized molten steel in the converter is tapped to a ladle and then alloyed by secondary deoxidation, wherein the deoxidation sequence adopts a mode of calcium carbide, low-carbon ferromanganese, aluminum ferromanganese and silicon-calcium alloy from weak to strong;
3) performing data regression fitting according to the carbon-oxygen balance theory and the deoxidation amount of each alloy element to obtain a quadratic regression equation of the parameters of the step-by-step deoxidation model:
【O】steel ladle=848.78+12.68mIn-furnace AlMnFe－4.58mSteel ladle LG+ 7.98mIn-package AlMnFe－33.25mSteel ladle TiFe－
0.06（mIn-furnace AlMnFe）2+ 0.06（mSteel ladle LG）2+ 0.03（mIn-package AlMnFe）2
+0.003（mSteel ladle CaSi）2+0.24（mSteel ladle TiFe）2
In the formula: m isIn-furnace AlMnFeKg representing the amount of added ferromanganese in the furnace
mSteel ladle LGRepresenting the amount of the pre-deoxidizer added into the steel ladle in kg
mIn-package AlMnFeKg representing the added amount of aluminum, manganese and iron in the steel ladle
mSteel ladle CaSiKg representing the added amount of silicon and calcium in the steel ladle
mSteel ladle TiFeKg representing the amount of ferrotitanium added to the ladle
The method comprises the following steps of establishing an addition amount reference table at each stage by using a mathematical model established by a function, verifying that the oxygen content of a steel ladle can be stably controlled between 15 ppm and 30ppm through field production, meeting the requirements of steel grades such as low-silicon low-carbon steel and the like on fluidity and inclusion morphology directly, and using a step-by-step deoxidation reference model as shown in the following table:
silicon-calcium alloy is adopted for silicon preparation, and deoxidation products containing Ca element are utilized to change the form of inclusions and reduce pure Al2O3To improve the castability of molten steel, to produce 12 CaO.7Al2O3The low-melting-point deoxidation product improves the fluidity of molten steel and completely avoids nozzle nodulation;
4) the composition of the inclusions analyzed by a scanning electron microscope on the poured steel sample shows that the point-ball inclusions after the deoxidation treatment of the aluminum alloy and the calcium silicon alloy are mainly 12CaO 7Al2O3The inclusions are small amount of silicate, and most of the inclusions are spherical particles of several micrometers and are uniformly distributed.
Claims (1)
1. A deoxidation control method suitable for smelting low-carbon low-silicon steel by a converter is characterized by comprising the following steps: the deoxidation line for producing the low-carbon low-silicon steel adopts a step-by-step operation method of a converter and a ladle to carry out deoxidation:
1) the molten steel in the converter is precipitated and deoxidized by adopting an aluminum deoxidizer in the early stage of tapping, so that the oxygen content of the molten steel is reduced, and partial Al can be adsorbed by slag in the converter2O3Deoxidizing products, reducing the total amount of the deoxidizing products in the ladle;
2) the deoxidized molten steel in the converter is tapped to a ladle and then alloyed by secondary deoxidation, wherein the deoxidation sequence adopts a mode of calcium carbide, low-carbon ferromanganese, aluminum ferromanganese and silicon-calcium alloy from weak to strong;
3) performing data regression fitting according to the carbon-oxygen balance theory and the deoxidation amount of each alloy element to obtain a quadratic regression equation of the parameters of the step-by-step deoxidation model:
【O】steel ladle=848.78+12.68mIn-furnace AlMnFe－4.58mSteel ladle LG+ 7.98mIn-package AlMnFe－33.25mSteel ladle TiFe－
0.06（mIn-furnace AlMnFe）2+ 0.06（mSteel ladle LG）2+ 0.03（mIn-package AlMnFe）2
+0.003（mSteel ladle CaSi）2+0.24（mSteel ladle TiFe）2
In the formula: m isIn-furnace AlMnFeKg representing the amount of added ferromanganese in the furnace
mSteel ladle LGRepresenting the amount of the pre-deoxidizer added into the steel ladle in kg
mIn-package AlMnFeKg representing the added amount of aluminum, manganese and iron in the steel ladle
mSteel ladle CaSiKg representing the added amount of silicon and calcium in the steel ladle
mSteel ladle TiFeKg representing the amount of ferrotitanium added to the ladle
The method comprises the following steps of establishing an addition amount reference table at each stage by using a mathematical model established by a function, verifying that the oxygen content of a steel ladle can be stably controlled between 15 ppm and 30ppm through field production, meeting the requirements of steel grades such as low-silicon low-carbon steel and the like on fluidity and inclusion morphology directly, and using a step-by-step deoxidation reference model as shown in the following table:
silicon-calcium alloy is adopted for silicon preparation, and deoxidation products containing Ca element are utilized to change the form of inclusions and reduce pure Al2O3To improve the castability of molten steel, to produce 12 CaO.7Al2O3The low-melting-point deoxidation product improves the fluidity of molten steel and completely avoids nozzle nodulation;
4) the composition of the inclusions analyzed by a scanning electron microscope on the poured steel sample shows that the point-ball inclusions after the deoxidation treatment of the aluminum alloy and the calcium silicon alloy are mainly 12CaO 7Al2O3The inclusions are small amount of silicate, and most of the inclusions are spherical particles of several micrometers and are uniformly distributed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322836A (en) * | 2020-11-04 | 2021-02-05 | 新疆八一钢铁股份有限公司 | Step-by-step deoxidation operation method suitable for low-carbon steel |
| CN113462847A (en) * | 2021-05-27 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Control method for ultralow titanium content of ultralow-carbon high-aluminum steel |
| CN114540713A (en) * | 2022-03-01 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN115418430A (en) * | 2022-07-17 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting of steel ladle cold steel |
-
2019
- 2019-12-28 CN CN201911383585.9A patent/CN110964877A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322836A (en) * | 2020-11-04 | 2021-02-05 | 新疆八一钢铁股份有限公司 | Step-by-step deoxidation operation method suitable for low-carbon steel |
| CN113462847A (en) * | 2021-05-27 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Control method for ultralow titanium content of ultralow-carbon high-aluminum steel |
| CN114540713A (en) * | 2022-03-01 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN114540713B (en) * | 2022-03-01 | 2023-03-14 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN115418430A (en) * | 2022-07-17 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting of steel ladle cold steel |
| CN115418430B (en) * | 2022-07-17 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting ladle cold steel |
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Application publication date: 20200407 |