CN100451134C - Double-slag converter process for producing high carbon low-phosphorus molten steel - Google Patents
Double-slag converter process for producing high carbon low-phosphorus molten steel Download PDFInfo
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- CN100451134C CN100451134C CNB200610166514XA CN200610166514A CN100451134C CN 100451134 C CN100451134 C CN 100451134C CN B200610166514X A CNB200610166514X A CN B200610166514XA CN 200610166514 A CN200610166514 A CN 200610166514A CN 100451134 C CN100451134 C CN 100451134C
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Abstract
The invention discloses a rotary furnace technique to manufacture high-carbon low-phosphor molten steel, which is characterized by the following: transmitting high-silicon high-phosphor molten iron into rotary furnace; blowing through gun-change and oxygen-change flow operation; removing phosphor first; pouring rich phosphoric slag at blowing time; adjusting terminal temperature and terminal carbon.
Description
Technical field
The present invention relates to the metallurgical technology field, refer to a kind of technology that high carbon low-phosphorus molten steel is produced in converter that is adapted to particularly.
Background technology
Converter has two kinds of tapping technology patterns when producing high carbon low-phosphorus molten steel, a kind of is the low mend carbon technology that draws, i.e. mend carbon (end point carbon is between 0.07%～0.12%) more in a large number after the low-carbon (LC) tapping; Another kind is high-carbon tapping technology (end point carbon 〉=0.30%).Low catch carbon technology can guarantee lower terminal point phosphorus, suitable terminal temperature and metastable end point carbon (being stabilized between 0.07%～0.12%), and its technology is comparatively stable, thereby is adopted by most steel mills.But this technology molten bath terminal point oxygen level height, its iron and steel stock consumes high, and yield of alloy is low, and the production cost height is serious to lining erosion.If adopt high-carbon tapping technology, will increase substantially end point carbon, significantly reduce molten bath terminal point oxygen, thereby reduce iron and steel stock and alloy consumption, and significantly reduce the inclusion that deoxidation alloying produces, improve the molten steel purity.But converter high-carbon tapping technology exists the dephosphorization ability, terminal temperature is on the low side and the mobile difference of finishing slag is unfavorable for difficult points such as slag splashing.When therefore converter current adopts high silicon high phosphorus hot metal to produce high carbon low-phosphorus molten steel, the low mend carbon technology that draws of many employings.Even if implement the high-carbon tapping, also adopt following two kinds of technologies usually, a kind of is earlier molten iron to be carried out the dephosphorization pre-treatment, implements the high-carbon tapping by converter again; Another kind is to adopt duplex practice to finish by two block converters, promptly by the dephosphorization of block converter elder generation, is heated up by another block converter carbon drop again.Based on the dual purpose that improves the quality and reduce cost, adopting high-carbon tapping explained hereafter high carbon low-phosphorus molten steel is very effective a kind of means, but all there is certain disadvantage in aforementioned two kinds of high-carbon tapping technology, the dephosphorization of molten iron pretreatment technology has increased the facility investment and the production cost of hot metal pretreatment greatly, and duplex practice not only the organization of production difficulty is big, and can restrict the performance of converter production capacity.
Summary of the invention
The objective of the invention is provides a kind of low cost, can be raw material, adopt double slag process to produce the converter process of high carbon low-phosphorus molten steel with high silicon high phosphorus hot metal in a block converter at the problems referred to above.
Technical scheme of the present invention is: high silicon high phosphorus hot metal is sent in the top bottom blowing converter, and carried out following step:
(1) a blowing dephosphorization deslagging in early stage: 50%～60% of slag making materials total amount is added in the converter, adopt the operation of blowing of low-Gao rifle position and height-low oxygen flow, early stage is poured out 70%～80% rich phosphorus slag after the end in blowing, bath temperature when control finishes in earlier stage is 1350～1450 ℃, basicity of slag is between 2.3～2.7, and iron oxide content is between 12%-16%;
(2) blowing secondary dephosphorization deslagging in mid-term: 30%～40% of slag making materials total amount is added in the converter, adopt the operation of blowing of high rifle position and low oxygen flow, mid-term is poured out 50%～60% slag after the end in blowing, basicity of slag when control finishes mid-term is between 3.2～3.7, and iron oxide content is 8%～12%;
(3) blowing later stage dephosphorization and adjust molten bath terminal temperature and end point carbon once more: will remain in 10%～20% the slag making materials adding converter, adopt the operation of blowing of high-low rifle position and medium oxygen flow, basicity of slag when the control later stage finishes is between 3.7～4.2, iron oxide content is 10%～15%, after the blowing later stage finishes, after in tapping process, carrying out the deoxidation alloying processing, promptly obtain high carbon low-phosphorus molten steel.
In the above-mentioned steps (1), said low-Gao rifle position and height-low oxygen flow is operating as: the low rifle position and the 3.0Nm that adopt 1.4m earlier
3The oxygen flow of/mint after 120～150 seconds is carried the rifle position to 1.7m, simultaneously oxygen flow is reduced to 2.6Nm
3/ mint, the said blowing time in early stage was controlled at 350～390 seconds.
In the above-mentioned steps (2), the slag making materials of said adding is the adding of in batches staggering of the batch by every crowd of 3～5k/t, and said high rifle position and low oxygen flow are: the rifle position and the 2.6Nm that adopt 1.8m
3The oxygen flow of/mint, the said blowing time in mid-term was controlled at 380～420 seconds.
In the above-mentioned steps (3), the slag making materials of said adding is the adding of in batches staggering of the batch by every crowd of 2～4kg/t, and said height-low rifle position and medium oxygen flow are operating as: the rifle position and the 2.8Nm that adopt 1.7m earlier
3The oxygen flow of/mint is tapped and the rifle position was forced down to 1.4m in preceding 30 seconds again, and the said time in blowing later stage was controlled at 80～120 seconds.
To having gone out the slag that stays behind the steel in the step (3), adopt the oxygen rifle to spatter slag rifle position again to the slag oxygen blast, wherein the rifle position is 0.5～1.0m, oxygen flow is 2.8Nm
3/ mint, oxygen supply time were controlled at 20～30 seconds.
In step (1), make full use of phosphor partition ratio height, the fabulous advantage of dephosphorization thermodynamic condition between low, the slag steel of bath temperature in blowing early stage, obtain dephosphorization dynamic conditions preferably by strengthening stirring intensity of molten pool simultaneously, can produce good dephosphorization effect, make the molten bath phosphorus content just reduce to lower level in earlier stage in blowing.
In step (2), owing to rise in blowing temperature in mid-term, decarburizing reaction is accelerated, iron oxide content reduces, because of the high-carbon tapping, terminal point oxygen is low simultaneously, and ferric oxide is low, phosphor partition ratio is relatively low between the slag steel, dephosphorization effect is poor, and easily rephosphorization must be operated by the deslagging in the step (1) and reduce phosphorus pentoxide content in the slag, and in step (2) again residue adjustment guarantee that slag has enough basicity and oxidisability, suppress the rephosphorization and the further purpose of dephosphorization to reach.
To having gone out the slag that stays behind the steel in the step (3), adopt the oxygen rifle again to spatter slag rifle position, to reach the purpose of slag splashing to the slag oxygen blast.
The present invention only needs to finish whole converting process at a block converter, has saved facility investment greatly.The present invention is by twice dephosphorization deslagging, can remove rich phosphorus slag, suppress rephosphorization and further dephosphorization, the tapping back adopts the oxygen rifle to spatter slag rifle position to the slag oxygen blast, solve the mobile difference of finishing slag and be unfavorable for difficult points such as slag splashing, the high carbon low-phosphorus molten steel of being produced is compared with the high carbon low-phosphorus molten steel that traditional method obtains, it is bessemerized end point carbon and brings up to 0.3%～0.8% by 0.07%～0.12%, the terminal point oxygen level is reduced to about 100ppm about by 350ppm, terminal point phosphorus is basically less than 0.015%, its iron and steel stock, cost consumptions such as alloy all significantly reduce, the smelting cost of high carbon low-phosphorus molten steel reduces by 26 yuan of/ton steel approximately, has promptly reduced production cost.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment: high silicon high phosphorus hot metal is sent in the top bottom blowing converter, and carried out following step:
(1) a blowing dephosphorization deslagging in early stage: 50%～60% of slag making materials total amount is added in the converter, when blowing operation, adopt low rifle position and the molten steel 3.0Nm per ton of 1.4m earlier
3The oxygen flow of/min, to strengthen stirring intensity of molten pool, so both can improve lime burn-off rate in early stage, also can make the molten bath phosphorus content just reduce to lower level in earlier stage in blowing, after 120～150 seconds the rifle position is carried to 1.7m, simultaneously oxygen flow is reduced to molten steel 2.6Nm per ton
3/ min, so that reduce blowing heat-up rate in early stage, prolong the dephosphorization phase, guarantee dephosphorization effect, the blowing time in early stage is the shortest to be no less than 350, no longer than 390 seconds, pour out 70%～80% rich phosphorus slag after the end, bath temperature when the control blowing finishes in earlier stage is 1350～1450 ℃, and basicity of slag is between 2.3～2.7, and iron oxide content is between 12～16%;
(2) blowing secondary dephosphorization deslagging in mid-term: 30%～40% of slag making materials total amount is added in the converter, and by the batch of every crowd of molten steel 3～5kg per ton with slag making materials addings of staggering, rifle position and the molten steel 2.6Nm per ton of employing 1.8m in batches
3The operation of blowing of the oxygen flow of/min, the blowing time in mid-term the shortlyest is no less than 380, no longer than 420 seconds, pour out 50%～60% slag after the end, and get the steel sample and determine that for the later stage duration of blast provides foundation, basicity of slag when control finishes mid-term is between 3.2～3.7, and iron oxide content is between 8%～12%:
(3) dephosphorization and phase are adjusted molten bath terminal temperature and end point carbon once more after the blowing: will remain in 10%～20% the slag making materials adding converter, and by the adding of staggering of the batch of every crowd of molten steel 2～4kg per ton in batches, when blowing, adopt rifle position and the molten steel 2.8Nm per ton of 1.7m earlier
3The oxygen flow of/min, tap and again the rifle position was forced down to 1.4m in preceding 30 seconds, wherein, basicity of slag when the control blowing later stage finishes is between 3.7～4.2, iron oxide content is between 10%～15%, institute's steel sample of getting is determined the blowing time in later stage when finishing mid-term according to blowing, and it is the shortest to be not less than 80, no longer than 120 seconds.After the blowing later stage finishes, in tapping process, carry out promptly obtaining high carbon low-phosphorus molten steel after deoxidation alloying handles.After tapping, pass through to adopt rifle position and the molten steel 2.8Nm per ton of 0.5～1.0m
3The oxygen flow of/min to improve slag fluidity, is guaranteed the slag splashing effect to slag oxygen blast 20～30 seconds.
Adopt technology of the present invention, can make end point carbon reach 0.3%～0.8%, terminal point oxygen is about 100ppm, and terminal point phosphorus is less than 0.015%.Following table has been listed part high carbon steel steel grade and has been bessemerized the processing parameter control situation of later stage when finishing.
| Steel grade | End point carbon distributes, % | End point carbon is average, % | Average terminal point phosphorus, % |
| Heavy rail series | 0.33~0.52 | 0.46 | 0.014 |
| SWRH82B | 0.36~0.6 | 0.45 | 0.011 |
| GCr15 etc. | 0.42~0.8 | 0.52 | 0.013 |
Claims (4)
1, a kind of double slag process is produced the converter process of high carbon low-phosphorus molten steel, it is characterized in that, high silicon high phosphorus hot metal is sent in the converter, and carried out following step:
(1) a dephosphorization deslagging in blowing early stage: 50%～60% of slag making materials total amount is added in the converter, adopts the operation of blowing of low-Gao rifle position and height-hang down oxygen flow, i.e. rifle position and the 3.0Nm of elder generation's employing 1.4m
3/ (mint) oxygen flow after 120～150 seconds is carried the rifle position to 1.7m, simultaneously oxygen flow is reduced to 2.6Nm
3/ (mint), the said blowing time in early stage was controlled at 350～390 seconds, and early stage is poured out 70%～80% rich phosphorus slag after the end in blowing, and the bath temperature of controlling when finishing early stage is 1350～1450 ℃, basicity of slag is between 2.3～2.7, and iron oxide content is between 12%-16%;
(2) blowing secondary dephosphorization deslagging in mid-term: 30%～40% of slag making materials total amount is added in the converter, adopt the operation of blowing of high rifle position and low oxygen flow, promptly adopt rifle position and the 2.6Nm of 1.8m
3/ (mint) low oxygen flow, the said blowing time in mid-term was controlled at 380～420 seconds, poured out 50～60% slag after blowing finishes mid-term, and the basicity of slag when control finishes mid-term is between 3.2～3.7, and iron oxide content is 8%～12%;
(3) blowing later stage dephosphorization and adjust molten bath terminal temperature and end point carbon once more: will remain 10%～20% slag making materials and add in the converter, and adopt the operation of blowing of high-low rifle position and medium oxygen flow, i.e. rifle position and the 2.8Nm of elder generation's employing 1.7m
3/ (mint) oxygen flow, tap preceding 30 seconds again with the rifle potential drop to 1.4m, the said blowing time in later stage was controlled at 80～120 seconds, basicity of slag when the control later stage finishes is between 3.7～4.2, iron oxide content is 10%～15%, after the blowing later stage finishes, in tapping process, carry out promptly obtaining high carbon low-phosphorus molten steel after deoxidation alloying handles.
2, double slag process as claimed in claim 1 is produced the converter process of high carbon low-phosphorus molten steel, it is characterized in that, in the step (2), the slag making materials of said adding is the adding of in batches staggering of the batch by every crowd of 3～5kg/t.
3, double slag process as claimed in claim 1 is produced the converter process of high carbon low-phosphorus molten steel, it is characterized in that, in the step (3), the slag making materials of said adding is the adding of in batches staggering of the batch by every crowd of 2～4kg/t.
4, double slag process as claimed in claim 1 is produced the converter process of high carbon low-phosphorus molten steel, it is characterized in that,, adopt the oxygen rifle again to spatter slag rifle position to the slag oxygen blast to having gone out the slag that stays behind the steel in the step (3), wherein the rifle position is 0.5～1.0m, and oxygen flow is 2.8Nm
3/ (mint), oxygen supply time was controlled at 20～30 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610166514XA CN100451134C (en) | 2006-12-28 | 2006-12-28 | Double-slag converter process for producing high carbon low-phosphorus molten steel |
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| CNB200610166514XA CN100451134C (en) | 2006-12-28 | 2006-12-28 | Double-slag converter process for producing high carbon low-phosphorus molten steel |
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| CN100451134C true CN100451134C (en) | 2009-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935734A (en) * | 2010-08-23 | 2011-01-05 | 首钢总公司 | Method for reducing rephosphorization amount in convertor steelmaking process |
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| CN101363068B (en) * | 2008-09-28 | 2010-06-23 | 首钢总公司 | Smelting method of low-phosphorus steel |
| CN101638707B (en) * | 2009-08-21 | 2011-07-20 | 武汉钢铁(集团)公司 | Bidirectional steel and oxygen supplying method of converter steelmaking |
| CN101880743A (en) * | 2010-05-19 | 2010-11-10 | 首钢总公司 | Technology for performing manganese ore alloying by converter less-slag melting |
| CN101906504A (en) * | 2010-08-30 | 2010-12-08 | 南京钢铁股份有限公司 | Smelting process for producing ultra-low phosphorous steel by converter |
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| CN102899443B (en) * | 2012-10-23 | 2014-06-18 | 秦皇岛首秦金属材料有限公司 | Process for smelting low-phosphorous molten iron |
| CN103255258B (en) * | 2013-06-11 | 2014-07-30 | 鞍钢股份有限公司 | Converter smelting method of low-phosphorus high-alloy steel |
| CN104561433B (en) * | 2014-12-24 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of converter smelting method of medium high carbon ultra-low phosphoretic steel water |
| CN104911294B (en) * | 2015-06-23 | 2017-04-12 | 武汉钢铁(集团)公司 | Method for smelting high-carbon and low-phosphorus steel by utilizing converter at low temperature |
| CN106884067A (en) * | 2016-12-25 | 2017-06-23 | 秦皇岛首秦金属材料有限公司 | A kind of converter operating method of high phosphorus hot metal low phosphorus steel by smelting |
| CN107151723A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the Semi-steel making method of slag entirely |
| CN110117689B (en) * | 2019-06-11 | 2020-07-31 | 北京科技大学 | Method for smelting low-phosphorus steel based on high-silicon molten iron converter double-slag method |
| CN114150100B (en) * | 2021-10-15 | 2023-02-03 | 邯郸钢铁集团设计院有限公司 | Steelmaking method for smelting high-carbon low-phosphorus steel by converter |
| CN115044741B (en) * | 2022-06-16 | 2023-11-17 | 宝武集团鄂城钢铁有限公司 | Dephosphorization method for low-phosphorus steel double slag in low-silicon high-phosphorus molten iron smelting |
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Cited By (2)
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|---|---|---|---|---|
| CN101935734A (en) * | 2010-08-23 | 2011-01-05 | 首钢总公司 | Method for reducing rephosphorization amount in convertor steelmaking process |
| CN101935734B (en) * | 2010-08-23 | 2012-11-21 | 首钢总公司 | Method for reducing rephosphorization amount in convertor steelmaking process |
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