CN112322836A - Step-by-step deoxidation operation method suitable for low-carbon steel - Google Patents
Step-by-step deoxidation operation method suitable for low-carbon steel Download PDFInfo
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- CN112322836A CN112322836A CN202011219339.2A CN202011219339A CN112322836A CN 112322836 A CN112322836 A CN 112322836A CN 202011219339 A CN202011219339 A CN 202011219339A CN 112322836 A CN112322836 A CN 112322836A
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- deoxidation
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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
- C21C5/36—Processes yielding slags of special composition
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a stepwise deoxidation operation method suitable for low-carbon steel, which comprises the following specific steps: the deoxidation route for producing the low-carbon steel adopts a step-by-step operation method of a converter and a ladle for deoxidation: 1. precipitating and deoxidizing molten steel in the converter by adopting an aluminum deoxidizer in the early tapping stage; 2. and (3) after molten steel deoxidized in the converter is tapped to a ladle, alloying is carried out by adopting 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.
Description
Technical Field
The invention relates to a step-by-step deoxidation operation method suitable for low-carbon steel.
Background
With the development of the metallurgical industry in China, the production process of the existing welding disc round steel is greatly changed, because the low-carbon low-silicon steel is adopted, the existing China always adopts the mode of die casting boiling steel for production, the existing die casting technology is gradually eliminated, the high-efficiency continuous casting and rolling technology is turned to, the existing large and medium-sized steel works adopt continuous casting and high-speed wire rod rolling to produce welding rod steel, and the continuous casting technology can only produce killed steel, but the defects are caused, such as high gas content, high disc round strength, low elongation rate, easy breakage in deep processing and the like, and the phenomenon of unstable welding arc and even sudden arc breakage is also caused. 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 completely adopts the ladle aluminum addition deoxidation process, because aluminum is a strong deoxidizer, Al2O3 can be generated by using the aluminum ladle for deoxidation singly, the melting point of Al2O3 reaches 2050 ℃, the Al2O3 is solid at the molten steel temperature, when the content of Al2O3 is high, the castability of the molten steel is poor, and a water gap is easy to block, and in addition, Al2O3 is amorphous inclusion, which influences the performance of steel products and has certain influence on the production stability and the field operation.
Disclosure of Invention
The invention aims to provide a step-by-step deoxidation operation method suitable for low-carbon steel, which can reduce total oxygen in steel, improve nonmetallic inclusions and meet the production requirements of low-carbon low-silicon steel.
The technical scheme for realizing the invention is that the stepwise deoxidation operation method suitable for the low-carbon steel comprises the following specific steps: the deoxidation route for producing the low-carbon steel adopts a step-by-step operation method of a converter and a ladle for deoxidation: 1. the molten steel in the converter is subjected to precipitation deoxidation by adopting an aluminum deoxidizer in the early tapping stage, so that the effect of reducing the oxygen content of the molten steel is achieved, and the total amount of deoxidation products in a ladle can be reduced by adsorbing partial Al2O3 deoxidation products by slag in the converter; 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; by adopting the step-by-step deoxidation, when the temperature of the molten steel is 1581 ℃, the average oxygen content of the steel ladle is 13.5ppm, and compared with the deoxidation condition of the steel ladle, the average oxygen content is reduced by 18.4 ppm.
According to the process characteristics of low-carbon low-silicon steel such as H08A and LS, the control of components and oxygen content is considered in the development process, and the reasonable deoxidation means is selected to stabilize the control of the components and the oxygen content, so that the quality of a casting blank is improved, and the production requirement of the low-carbon low-silicon steel is met. The deoxidation line for the existing production of the low-carbon low-silicon steel adopts Si + Mn + Al deoxidation, and the formed deoxidation product has the advantages of spodumene 2 MnO.Al2O3.SiO2; silumin 3 MnO.Al2O3.3SiO2; pure Al2O 3. Because aluminum is a strong deoxidizer, Al2O3 can be generated by using aluminum for deoxidation singly, the melting point of Al2O3 reaches 2050 ℃, the Al2O3 is solid at the temperature of molten steel, when the content of Al2O3 is high, the castability of the molten steel is poor, a water gap is easy to block, and in addition, Al2O3 is amorphous inclusion, which influences the performance of steel. Therefore, for the steel grade deoxidized by aluminum, the inclusion form is changed, the generation of pure Al2O3 is reduced and the castability of molten steel is improved by adopting a step-by-step deoxidation operation method and simultaneously utilizing deoxidation products containing Ca elements. When the content is more than 0.10 and less than omega (Ca)/omega (Al) and less than 0.15, a 12 CaO.7Al2O3 low-melting-point deoxidation product is generated, the fluidity of the molten steel can be improved, and nozzle nodulation is completely avoided, but in the production process, because of the oxygen content of the molten steel, the oxygen absorption function in the wire feeding process and the influence of the production rhythm, the control of the Ca content of the molten steel is unstable, and the accurate control of the content is difficult to achieve.
Metallographic inclusion inspection of the cast steel sample shows that the steel sample inclusions subjected to the step-by-step deoxidation treatment are mostly in the form of point-and-ball particles, are distributed in a dispersion manner and are well denatured; the inclusions in the steel deoxidized by the ladle are mostly long-strip-shaped and have larger size. The composition of the inclusions is analyzed by a scanning electron microscope, and the result shows that strip-shaped inclusions after ladle deoxidation treatment mainly comprise Al2O3 inclusions and a small amount of silicate, and spherical inclusions after step deoxidation treatment mainly comprise silicate BaO.SiO2 or (BaO.CaO). SiO2 with high barium content and a small amount of sulfide fine particles, and most inclusions are spherical particles of several microns and are uniformly distributed. Compared with the step-by-step deoxidation of steel ladles, the step-by-step deoxidation is adopted to smelt the low-silicon low-carbon steel, so that the total oxygen in the steel can be reduced and the nonmetallic inclusion can be improved. The step-by-step deoxidation mode can meet the production of low-carbon low-silicon steel, and therefore, greater potential economic benefits and social benefits are generated.
Detailed Description
A stepwise deoxidation operation method suitable for low-carbon steel comprises the following specific steps: the deoxidation route for producing the low-carbon steel adopts a step-by-step operation method of a converter and a ladle for deoxidation: 1. the molten steel in the converter is subjected to precipitation deoxidation by adopting an aluminum deoxidizer in the early tapping stage, so that the effect of reducing the oxygen content of the molten steel is achieved, and the total amount of deoxidation products in a ladle can be reduced by adsorbing partial Al2O3 deoxidation products by slag in the converter; 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; by adopting the step-by-step deoxidation, when the temperature of the molten steel is 1581 ℃, the average oxygen content of the steel ladle is 13.5ppm, and compared with the deoxidation condition of the steel ladle, the average oxygen content is reduced by 18.4 ppm.
Claims (1)
1. A stepwise deoxidation operation method suitable for low-carbon steel is characterized by comprising the following specific steps: the deoxidation route for producing the low-carbon steel adopts a step-by-step operation method of a converter and a ladle for deoxidation: 1. precipitating and deoxidizing molten steel in the converter by adopting an aluminum deoxidizer in the early tapping stage; 2. and (3) after molten steel deoxidized in the converter is tapped to a ladle, alloying is carried out by adopting 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219339.2A CN112322836A (en) | 2020-11-04 | 2020-11-04 | Step-by-step deoxidation operation method suitable for low-carbon steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219339.2A CN112322836A (en) | 2020-11-04 | 2020-11-04 | Step-by-step deoxidation operation method suitable for low-carbon steel |
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| CN112322836A true CN112322836A (en) | 2021-02-05 |
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| CN202011219339.2A Withdrawn CN112322836A (en) | 2020-11-04 | 2020-11-04 | Step-by-step deoxidation operation method suitable for low-carbon steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343806A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of H08A, H08MnA series low-carbon steel smelting deoxidization technique |
| CN110964877A (en) * | 2019-12-28 | 2020-04-07 | 新疆八一钢铁股份有限公司 | Deoxidation control method suitable for smelting low-carbon low-silicon steel by converter |
-
2020
- 2020-11-04 CN CN202011219339.2A patent/CN112322836A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343806A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of H08A, H08MnA series low-carbon steel smelting deoxidization technique |
| CN110964877A (en) * | 2019-12-28 | 2020-04-07 | 新疆八一钢铁股份有限公司 | Deoxidation control method suitable for smelting low-carbon low-silicon steel by converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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: 20210205 |
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