CN103014222B - Method for reducing smelting cost of high carbon steel and medium carbon steel - Google Patents
Method for reducing smelting cost of high carbon steel and medium carbon steel Download PDFInfo
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- CN103014222B CN103014222B CN201210558559.7A CN201210558559A CN103014222B CN 103014222 B CN103014222 B CN 103014222B CN 201210558559 A CN201210558559 A CN 201210558559A CN 103014222 B CN103014222 B CN 103014222B
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Abstract
The invention provides a method for reducing the smelting cost of high carbon steel and medium carbon steel. The method comprises the steps as follows: controlling a final temperature of molten steel to be higher than the normal final temperature by 5-7 DEG C for the high and medium carbon steel with carbon contents larger than 0.12%; adding desulfurized molten iron according to the proportion that 18 kg of the desulfurized molten iron is added into each ton of steel; shaking a converter forwards and rearwards once at the angle of plus or minus 30 degrees; controlling a final deoxygenation rate to be 85% of the normal deoxygenation rate; preparing manganese alloy according to 0.15% of residual manganese, and preparing silicon alloy according to 0.03% of residual silicon; and adjusting acid melting aluminum in the molten steel by adopting a method of feeding an aluminum wire in an argon station. According to the method, the final carbon, manganese and silicon contents of the molten steel can be increased, the oxygen value of the molten steel can be remarkably reduced, the erosion of a furnace lining can be reduced, the cleanliness of the molten steel can be improved, the unit consumption of deoxygenation alloy and the consumption of a carburant can be reduced, the smelting cost can be greatly lowered, and the smelting cost of each ton of steel can be lowered by 38 yuan.
Description
Technical field
The invention belongs to steelmaking technical field, relate in particular to a kind of converter smelting endpoint and add partial desulfurization molten iron to reduce the method for smelting cost.
Background technology
Large-scale combined blown converter is when smelting the medium and high carbon steel of finished product C >=0.12%, and its terminal catch carbon is identical with all the other steel grades, so alloy consumption, iron and steel stock consumption and energy consumption are all identical with soft steel, do not give full play to the own characteristic that steel grade carbon is high.Part steel mill reduces the smelting cost of this type of steel grade by high catch carbon method both at home and abroad, but for the mammoth conveter that is greater than 200 tons, adopt the working method of high catch carbon, its operation is more difficult, and effect is also not remarkable, therefore mammoth conveter does not all adopt the smelting process of high catch carbon, thereby has had a strong impact on the smelting cost of medium and high carbon steel.
Summary of the invention
The present invention aims to provide and a kind ofly can effectively reduce the consumption of deoxygenated alloy and carburelant, and improves the method for the reduction medium and high carbon steel smelting cost of Cleanliness of Molten Steel.
For this reason, the solution that the present invention takes is:
A method that reduces medium and high carbon steel smelting cost, is characterized in that, the medium high carbon steel grade for finished product C >=0.12% adds partial desulfurization molten iron in smelting endpoint molten steel, improves molten steel end point carbon, residual manganese, residual silicone content, and its concrete grammar and step are:
1, the total Intake Quantity of converter reduces 1.8-2.8% on the basis of standard Intake Quantity;
2, the terminal temperature of controlling molten steel is than the high 5-7 ℃ of normal end temperature;
3, after the sampling of terminal thermometric, converter mouth is shaken and converts iron position;
4, according to steel per ton, be blended into the ratio of 18kg, tiny stream is blended into desulfurized molten iron, is wholely blended into the time and is controlled at 50-70s;
5, be blended into after molten iron, by before and after converter ± 30 ° carry out grate once, then start tapping;
6, tapping process carries out Alloying Treatment: to control terminal deoxidation be normal deoxidation 85%, and deoxygenated alloy reduces 100kg than normal add-on; Manganese alloy carries out alloy outfit according to residual violent 0.15%, and silicon alloy is equipped with according to residual silicon 0.03%;
7, adopt argon station to feed the method for aluminum steel, regulate the molten aluminium of acid in molten steel.
For occurring the fierce heat that cannot fall stove of reaction, in ton steel, adding the ratio of 0.7-0.8kg to add granularity is that the cold slag steel of 15-50mm is pressed slag operation.
Beneficial effect of the present invention is:
Because the present invention has improved molten steel end point carbon, residual manganese, residual silicone content, thereby can significantly reduce molten steel oxygen value, the erosion that had both alleviated furnace lining, the cleanliness factor of raising molten steel; Can reduce again the unit consumption of deoxygenated alloy and the consumption of carburelant, greatly reduce smelting cost, make the smelting cost of ton steel reduce 38 yuan.
Embodiment
Below, the medium high carbon steel grade that the 260 tons of combined blown converters of 285 tons of total Intake Quantitys, tap of take are smelted finished product C >=0.12% is example, the present invention will be further described.
Embodiment 1:
In smelting endpoint molten steel, add concrete grammar and the step of partial desulfurization molten iron to be:
1, the total Intake Quantity of converter is controlled at 280 tons.
2, the terminal temperature of control molten steel is higher 5 ℃ than target temperature.
3, after the sampling of terminal thermometric, converter mouth is shaken and converts iron position.
4, tiny flow direction in molten steel is blended into desulfurized molten iron 5000kg, and the time of being blended into is controlled at 60s.
5, be blended into after molten iron, by before and after converter ± 30 ° carry out grate once, then start tapping.
6, tapping process carries out Alloying Treatment: to control terminal deoxidation be normal deoxidation 85%, and for example, when terminal oxygen value is 500ppm, deoxygenated alloy ferro-aluminum add-on is 550kg; Manganese alloy carries out alloy outfit according to residual violent 0.15%, and silicon alloy is equipped with according to residual silicon 0.03%.
7, adopt argon station to feed the method for aluminum steel, regulate the molten aluminium of acid in molten steel.
In production process, occurring the fierce phenomenon that cannot fall stove of reaction, is therefore that the cold slag steel of 15-50mm is pressed slag operation by high hopper to adding 210kg granularity in molten steel.
Embodiment 2: take Q235B as example
1, the total Intake Quantity of converter is controlled at 277 tons.
2, the terminal temperature of controlling molten steel is at 1660 ℃.
3, after the sampling of terminal thermometric, converter mouth is shaken and converts iron position.
4, tiny flow direction in molten steel is blended into desulfurized molten iron 5000kg, and the time of being blended into is controlled at 70s.
5, be blended into after molten iron, by before and after converter ± 30 ° carry out grate once, then start tapping.
6, tapping process carries out Alloying Treatment: to control terminal deoxidation be normal deoxidation 85%, and while being 500ppm as terminal oxygen value, deoxygenated alloy ferro-aluminum add-on is 550kg; Manganese alloy carries out alloy outfit according to residual violent 0.15%, and silicon alloy is equipped with according to residual silicon 0.03%;
7, adopt argon station to feed the method for aluminum steel, regulate the molten aluminium of acid in molten steel.
All the other adopt common process.
Claims (2)
1. a method that reduces medium and high carbon steel smelting cost, is characterized in that, the medium high carbon steel grade for finished product C >=0.12% adds partial desulfurization molten iron in smelting endpoint molten steel, improves molten steel end point carbon, residual manganese, residual silicone content, and its concrete grammar and step are:
(1), the total Intake Quantity of converter reduces 1.8-2.8% on the basis of standard Intake Quantity;
(2) terminal temperature of, controlling molten steel is than the high 5-7 ℃ of normal end temperature;
(3), after terminal thermometric sampling, converter mouth is shaken and converts iron position;
(4), according to steel per ton, be blended into the ratio of 18kg, tiny stream is blended into desulfurized molten iron, is wholely blended into the time and is controlled at 50-70s;
(5), be blended into after molten iron, by before and after converter ± 30 ° carry out grate once, then start tapping;
(6), tapping process carries out Alloying Treatment: to control terminal deoxidation be normal deoxidation 85%, and deoxygenated alloy reduces 100kg than normal add-on; Manganese alloy carries out alloy outfit according to residual violent 0.15%, and silicon alloy is equipped with according to residual silicon 0.03%;
(7), adopt argon station to feed the method for aluminum steel, regulate the molten aluminium of acid in molten steel.
2. the method for reduction medium and high carbon steel smelting cost according to claim 1, is characterized in that, for occurring the fierce heat that cannot fall stove of reaction, in ton steel, adding the ratio of 0.7-0.8kg to add granularity is that the cold slag steel of 15-50mm is pressed slag operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210558559.7A CN103014222B (en) | 2012-12-21 | 2012-12-21 | Method for reducing smelting cost of high carbon steel and medium carbon steel |
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| CN201210558559.7A CN103014222B (en) | 2012-12-21 | 2012-12-21 | Method for reducing smelting cost of high carbon steel and medium carbon steel |
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| CN103014222A CN103014222A (en) | 2013-04-03 |
| CN103014222B true CN103014222B (en) | 2014-05-07 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087851A (en) * | 2015-08-28 | 2015-11-25 | 桂林昌鑫机械制造有限公司 | Method for smelting high-carbon steel with semisteel |
| CN105063265B (en) * | 2015-08-31 | 2017-06-06 | 山东钢铁股份有限公司 | A kind of method that carburetting is carried out to No. 45 steel using low-sulfur molten iron |
| CN107794328B (en) * | 2016-08-31 | 2019-08-06 | 鞍钢股份有限公司 | A kind of method that converter molten steel deoxidization process control goes out iron |
| CN108060287A (en) * | 2017-12-20 | 2018-05-22 | 新疆昆玉钢铁有限公司 | Element recoverying and utilizing method is improved in the outer mix and convert technique of molten iron line |
| CN109868336B (en) * | 2019-03-12 | 2020-12-18 | 山东钢铁股份有限公司 | Method for controlling manganese content in molten steel |
| CN113512683A (en) * | 2021-07-16 | 2021-10-19 | 新疆八一钢铁股份有限公司 | Low-carbon consumption preparation method of high-strength anti-seismic steel bar |
| CN115287400A (en) * | 2022-08-31 | 2022-11-04 | 鞍钢股份有限公司 | Method for rapidly recarburizing molten iron for producing high-carbon steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5819426A (en) * | 1981-07-28 | 1983-02-04 | Kobe Steel Ltd | Production of low phosphorus, low sulfur and high carbon steel |
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- 2012-12-21 CN CN201210558559.7A patent/CN103014222B/en active Active
Non-Patent Citations (5)
| Title |
|---|
| 260t转炉留渣操作实践;牛兴明等;《鞍钢技术》;20120415(第2期);第42-45、55页 * |
| JP昭58-19426A 1983.02.04 |
| 八钢120t转炉冶炼Q235B钢影响脱硫的因素探讨;郑有恩等;《2010年全国炼钢-连铸生产技术会议文集》;20100830;第149-153页 * |
| 牛兴明等.260t转炉留渣操作实践.《鞍钢技术》.2012,(第2期),第42-45、55页. |
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