CN103966389A - Method of utilizing semisteel to smelt high-carbon steel - Google Patents
Method of utilizing semisteel to smelt high-carbon steel Download PDFInfo
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Abstract
The invention discloses a method of utilizing semisteel to smelt high-carbon steel. The method comprises the following steps: (1) feeding semisteel to a converter, adding active lime, high-magnesium lime and an acidic compound slagging constituent to the converter, performing top blowing of oxygen and bottom blowing of nitrogen or argon to carry out converting, adjusting the basicity of slag in the converter to be 2.5-3.5, converting for 5-6 minutes, and discarding the slag, wherein the conditions for top blowing of oxygen are that the oxygen supply intensity is 2-3 m<3> per ton of steel per minute, and the oxygen gun position is 2.5-3 m; (2) under the converting condition of top blowing of oxygen and bottom blowing of nitrogen or argon, adding active lime, high-magnesium lime and the acidic compound slagging constituent to the converter again, adjusting the basicity of slag in the converter to be 3-4, and then performing smelting end point control and tapping the steel, wherein the conditions for top blowing of oxygen are as follows: the oxygen supply intensity is 3-3.5 m<3> per ton of steel per minute, and the oxygen gun position is 1.8-2.8 m. The method can effectively dephosphorize, protect carbon, and achieve the high-carbon steel smelting purpose under dephosphorization.
Description
Technical field
The present invention relates to metallurgical technology field, particularly, relate to a kind of method of semisteel smelting high carbon steel.
Background technology
Along with industry and scientific and technological development, every profession and trade is more and more harsher to the specification of quality of steel.In steel, carbon content and phosphorus content directly affect the quality of steel.The method of converter smelting high carbon steel generally has two kinds, a kind of is homlolgation, the carbon of tapping is lower, tapping process adds carburelant to carry out carburetting to molten steel, the method can guarantee in endpoint molten steel, to have lower phosphorus content, but slag oxidation is high can corrode furnace lining, the high reductor consumption that can increase of molten steel oxygen activity also can reduce yield of alloy simultaneously, and the backward ladle of tapping adds a large amount of carburelants, makes molten steel composition fluctuation larger; Another kind method is that height draws the method for re-blowing, and the method tapping carbon content is higher, and generally, between >=0.20%, steel oxygen content in water is lower, and yield of alloy is higher and stablely save a large amount of carburelants simultaneously, but the method is difficult to realize liquid steel dephosphorization simultaneously, protects carbon.
At present, domestic molten iron-steelmaking enterprise, by the optimization to converter smelting process, substantially can realize molten steel Dephosphorization under high catch carbon steel-making mode and protect carbon.Existing with the high report that draws the method smelting high carbon steel of re-blowing of molten iron employing in existing document, as the 7th (2009) China Steel nd Annual Meeting collection of < < (on) " converter high carbon steel Study on Smelting Process and application " literary composition in > > discloses Anshan iron and steel plant two steel-making for solving the dephosphorization of converter smelting high carbon steel, protect carbon, the problem that temperature raising three is difficult to realize simultaneously, by terminal is stayed to the quantity of slag, bottom blowing flow, the optimization that oxygen lance position and terminal are controlled has finally realized height and has drawn the method smelting high carbon steel of re-blowing, and obtained good effect.But the design parameter while not relating to converter smelting high carbon steel in literary composition, as slagging method etc., and what adopt is conventional molten iron-steelmaking.
In order to ensure the effective utilization to vanadium resource, adopting schreyerite resource to smelt need to carry out vanadium extraction and desulfurization before steel-making.But carbonaceous amount percentage composition low (3.4%-4.0%) in the half steel that semi-steel making enterprise obtains after by desulfurization vanadium extraction, in half steel, silicon, manganese heating slagging constituent content are vestige, and during semisteel smelting, slag making mostly adopts and adds acid slag making materials, slag system constituent element is single, slagging speed is slow, and dephosphorization rate is low.Therefore, nearly all adopt homlolgation during semisteel smelting high carbon steel.The method, owing to adding a large amount of carburelants, has not only increased the cost of smelting but also can cause composition in molten steel to fluctuate larger.Use half steel for raw material and adopt the high method of the method smelting high carbon steel of re-blowing of drawing not yet to have report.
Therefore, this area is badly in need of, in the situation of the high catch carbon of a kind of converter of exploitation, can realizing the method for effective reduction endpoint molten steel semisteel smelting phosphorus content and that reach tapping steel with high carbon.
Summary of the invention
The object of the invention is, in order to overcome sludging time length and the poor defect of dephosphorization effect in existing semisteel smelting high carbon steel method, provides the method for the semisteel smelting high carbon steel that a kind of rapid slagging and dephosphorization effect are good.
The present inventor finds under study for action, at top blast oxygen, carries out under blowing condition, by adding quickened lime, high magnesium lime and acid composite fluxing medium working the slag basicity, can reach rapid slagging and effectively solve the low problem of dephosphorization rate; The present inventor further studies discovery, at top blast oxygen, carry out under blowing condition, by again adding quickened lime, high magnesium lime and acid composite fluxing medium working the slag basicity and carrying out the control of smelting endpoint, can effectively slow down reaction between carbon and oxygen speed in stove, reach the object of protecting carbon.
To achieve these goals, the invention provides a kind of method of semisteel smelting high carbon steel, wherein, the method comprises: (1) adds quickened lime, high magnesium lime and acid composite fluxing medium be blended into half steel in converter after in stove, and top blast oxygen blows, and the basicity of slag in converter is adjusted to 2.5-3.5, after blowing 5-6min, outwell slag, the condition of top blast oxygen comprises: oxygen supply intensity is 2-3m3/ (ton steel min), and the rifle position of oxygen rifle is 2.5-3m; (2) under the condition blowing at top blast oxygen, in stove, again add quickened lime, high magnesium lime and acid composite fluxing medium, basicity of slag in converter is adjusted to 3-4, then carry out Terminal Process Control tapping, the condition of top blast oxygen comprises: oxygen supply intensity is 3-3.5m3/ (ton steel min), and the rifle position of oxygen rifle is 1.8-2.8m.
According to the method for semisteel smelting high carbon steel provided by the invention, slag making fast, dephosphorization, and reach tapping steel with high carbon.In addition, in method provided by the invention, avoid adding a large amount of carburelants, thus the composition fluctuation of having avoided molten steel to cause because adding carburelant, and reduced the production cost of semisteel smelting.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that not doing contrary explanation, described basicity of slag is CaO and SiO
2the ratio of weight percentage, i.e. R=CaO/SiO
2, wherein, CaO does not comprise the CaO in acid composite fluxing medium; " the m of unit
3/ (ton steel min) " refer to respect to half steel molten steel per ton the gas flow of per minute (in standard volume).
A kind of method that the invention provides semisteel smelting high carbon steel, the method comprises:
(1) in stove, add quickened lime, high magnesium lime and acid composite fluxing medium be blended into half steel in converter after, top blast oxygen blows, and the basicity of slag in converter is adjusted to 2.5-3.5, after blowing 5-6min, outwell slag, the condition of described top blast oxygen comprises: oxygen supply intensity is 2-3m
3/ (ton steel min), the rifle position of oxygen rifle is 2.5-3m;
(2) under the condition blowing at top blast oxygen, in stove, again add quickened lime, high magnesium lime and acid composite fluxing medium, basicity of slag in converter is adjusted to 3-4, then carries out Terminal Process Control tapping, the condition of described top blast oxygen comprises: oxygen supply intensity is 3-3.5m
3/ (ton steel min), the rifle position of oxygen rifle is 1.8-2.8m.
In the present invention, described high carbon steel refers to the steel grade of finished product carbon content >=0.70 % by weight.
The present inventor finds under study for action, at oxygen supply intensity, is 2-3m
3/ (ton steel min) and the rifle position of oxygen rifle are that 2.5-3m top blast oxygen carries out under blowing condition, by adding quickened lime, high magnesium lime and acid composite fluxing medium working the slag basicity, be 2.5-3.5, can reach rapid slagging and effectively solve the low problem of dephosphorization rate; The present inventor further studies discovery, changes oxygen supply condition, at oxygen supply intensity, is 3-3.5m
3/ (ton steel min), the rifle position of oxygen rifle is that 1.8-2.8m top blast oxygen carries out under blowing condition, by again adding quickened lime, high magnesium lime and acid composite fluxing medium working the slag basicity, be the control that 3-4 smelts and carry out smelting endpoint, can effectively slow down reaction between carbon and oxygen speed in stove, reach the object of protecting carbon, finally realize the object of dephosphorization tapping steel with high carbon.
In the present invention, in step (1) and step (2), add quickened lime, the order of high magnesium lime and acid composite fluxing medium is not particularly limited, as long as make the basicity of slag in converter be adjusted to described basicity, for example can be for add quickened lime simultaneously, high magnesium lime and acid composite fluxing medium make basicity of slag in converter be adjusted to required basicity or first add quickened lime and high magnesium lime to add acid composite fluxing medium to make basicity of slag in converter be adjusted to required basicity again, under preferable case, add quickened lime, the order of high magnesium lime and acid composite fluxing medium for first adding quickened lime and high magnesium lime to add composite fluxing medium again so that converter in basicity of slag be adjusted to required basicity.
According to method provided by the invention, can rapid slagging in step (1), now slag is rich phosphorus slag, slag is all outwelled, thereby reached good dephosphorization effect.
In the present invention, for quickened lime, high magnesium lime and acid composite fluxing medium, be not particularly limited, under preferable case, in step (1), the add-on of described quickened lime is 10-15kg/ ton steel, the add-on of described high magnesium lime is 10-12kg/ ton steel, and it is 2.5-3.5 that the add-on of described acid composite fluxing medium makes basicity of slag in converter; In step (2), the add-on of described quickened lime is 7-10kg/ ton steel, and the add-on of described high magnesium lime is 5-8kg/ ton steel, and it is 3-4 that the add-on of described acid composite fluxing medium makes basicity of slag in converter.
The present inventor finds under study for action, method provided by the invention, in step (1), during blowing 5-6min, in slag, oxidisability is very high, slag relatively foams, cause slag to be difficult to pour out fire door, consider the efficiency of semisteel smelting, can control slag foamed and reduce basicity of slag to pour out fast slag, under preferable case, in step (1), blowing 5-6min after and outwell before slag, add the acid composite fluxing medium of 2-3kg/ ton steel.
In the present invention, for described quickened lime, high magnesium lime and acid composite fluxing medium, do not have special requirement, can be conventional quickened lime, high magnesium lime and the acid composite fluxing medium using in this area, for example, described quickened lime can be the quickened lime of content>=85 % by weight of CaO; Described high magnesium lime can be the high magnesium lime of the MgO of the CaO that contains 45-55 % by weight and 30-50 % by weight; Described acid composite fluxing medium can be for containing the SiO of 60-75 % by weight
2, the CaO of 10-15 % by weight is, the FeO of the MgO of 1-3 % by weight, 7-15 % by weight and the Fe of 1-37 % by weight
2o
3acid composite fluxing medium.
In the present invention, in order further to ensure the quality of tapping molten steel, under preferable case, in step (1) and step (2), converting process also comprises bottom blowing nitrogen or argon gas.For bottom blowing nitrogen or argon gas, do not have special requirement, for example, in step (1), the intensity of bottom blowing nitrogen or argon gas can be 0.08-0.13m
3/ (ton steel min); In step (2), the intensity of bottom blowing nitrogen or argon gas can be 0.03-0.05m
3/ (ton steel min).
In the present invention, under preferable case, described Terminal Process Control comprises: tapping molten steel is that in 1600-1630 ℃, molten steel, carbon content is that 0.3-0.55 % by weight and phosphorus content are 0.006-0.018 % by weight.
In the present invention, described half steel can be the half steel after vanadium extraction, and the half steel after described vanadium extraction can contain: the C that is more than or equal to 3.5 % by weight, the Si of 0-0.01 % by weight, the Mn of 0-0.04 % by weight, the P of 0.05-0.09 % by weight, the S of 0.005-0.02 % by weight and the Fe of surplus; Under preferable case, the half steel after described vanadium extraction can contain: the C of 3.5-4 % by weight, the Si of 0-0.1 % by weight, the Mn of 0-0.04 % by weight, the P of 0.05-0.09 % by weight, the Fe of the S of 0.005-0.02 % by weight and 95.4-96.4 % by weight.The temperature of the half steel after described vanadium extraction can be more than or equal to 1300 ℃, is preferably 1300-1350 ℃.
Below will describe the present invention by embodiment.
Embodiment 1
The half steel of take after vanadium extraction is raw material Smelting Bearing Steel GCr15.
In the present embodiment, quickened lime is the quickened lime of the CaO that contains 88 % by weight; High magnesium lime is the high magnesium lime of the CaO of the MgO that contains 50 % by weight and 45 % by weight; Acid composite fluxing medium is the SiO that contains 60 % by weight
2, the CaO of 15 % by weight is, the FeO of the MgO of 1 % by weight, 15 % by weight and the Fe of 1 % by weight
2o
3acid composite fluxing medium.
Steel-making converter nominal capacity is 120t.Half steel C content after vanadium extraction is 3.5 % by weight, and Si content is 0.01 % by weight, Mn content 0.04 % by weight, and P content is 0.05 % by weight, and S content is 0.005 % by weight, and temperature is 1300 ℃, and weight is 130t.
(1) half steel after vanadium extraction is directly blended into converter, in converter, add ton quickened lime of steel 10kg and a ton high magnesium lime of steel 10kg, then adding acid composite fluxing medium working the slag basicity is 2.5, top blast oxygen and argon bottom-blowing blow simultaneously, after blowing 5min, add the acid composite fluxing medium of ton steel 2kg, outwell slag.Wherein, the condition of top blast oxygen comprises: oxygen lance position is 3m, and the intensity of top blast oxygen is 2m
3/ (ton steel min); The condition of argon bottom-blowing comprises: the intensity of argon bottom-blowing is 0.08m
3/ ton steel min.
(2) then, under the condition blowing at top blast oxygen and argon bottom-blowing, again add ton steel 7kg quickened lime and ton steel 5kg high magnesium lime, following acid composite fluxing medium working the slag basicity is 3, blowing 3min carries out Terminal Process Control, and to obtain temperature be 1600 ℃, carbon content is 0.55 % by weight, and phosphorus content is the endpoint molten steel of 0.018 % by weight; Wherein, the condition of top blast oxygen comprises: oxygen lance position is 1.8m, and the intensity of top blast oxygen is 3.5m
3/ (ton steel min); The condition of argon bottom-blowing comprises: the intensity of argon bottom-blowing is 0.03m
3/ ton steel min.
Embodiment 2
The half steel of take after vanadium extraction is raw material smelting P72LXB.
In the present embodiment, quickened lime is the quickened lime of the CaO that contains 88 % by weight; High magnesium lime is the high magnesium lime of the CaO of the MgO that contains 38 % by weight and 55 % by weight; Acid composite fluxing medium is the SiO that contains 75 % by weight
2, the CaO of 7 % by weight is, the FeO of the MgO of 3 % by weight, 7 % by weight and the Fe of 3 % by weight
2o
3acid composite fluxing medium.
Steel-making converter nominal capacity is 120t.Half steel C content after vanadium extraction is 3.6 % by weight, and Si content is 0.005 % by weight, Mn content 0.03 % by weight, and P content is 0.07 % by weight, and S content is 0.015 % by weight, and temperature is 1310 ℃, and weight is 130t.
(1) half steel after vanadium extraction is directly blended into converter, in converter, add ton quickened lime of steel 13kg and a ton high magnesium lime of steel 11kg, following acid composite fluxing medium working the slag basicity is 3, top blast oxygen and bottom blowing nitrogen blow simultaneously, after blowing 5.5min, add the acid composite fluxing medium of ton steel 2.5kg, outwell slag.Wherein, the condition of top blast oxygen comprises: oxygen lance position is 2.5m, and the intensity of top blast oxygen is 3m
3/ (ton steel min); The condition of bottom blowing nitrogen comprises: the intensity of bottom blowing nitrogen is 0.13m
3/ ton steel min.
(2) then, under the condition blowing at top blast oxygen and bottom blowing nitrogen, again add ton steel 8kg quickened lime and ton steel 7kg high magnesium lime, following acid composite fluxing medium working the slag basicity is 3.5, blowing 3min carries out Terminal Process Control, and to obtain temperature be 1615 ℃, carbon content is 0.45 % by weight, and phosphorus content is the endpoint molten steel of 0.012 % by weight; Wherein, the condition of top blast oxygen comprises: oxygen lance position is 2.8m, and the intensity of top blast oxygen is 3m
3/ (ton steel min); The condition of bottom blowing nitrogen comprises: the intensity of bottom blowing nitrogen is 0.04m
3/ ton steel min.
Embodiment 3
The half steel of take after vanadium extraction is raw material smelting P82LXA.
In the present embodiment, quickened lime is the quickened lime of the CaO that contains 85 % by weight; High magnesium lime is the high magnesium lime of the CaO of the MgO that contains 30 % by weight and 52 % by weight; Acid composite fluxing medium is the SiO that contains 65 % by weight
2, the CaO of 13 % by weight is, the FeO of the MgO of 2 % by weight, 10 % by weight and the Fe of 1 % by weight
2o
3acid composite fluxing medium.
Steel-making converter nominal capacity is 120t.Half steel C content after vanadium extraction is 3.65 % by weight, Mn content 0.04 % by weight, and P content is 0.09 % by weight, and S content is 0.02 % by weight, and temperature is 1317 ℃, and weight is 130t.
(1) half steel after vanadium extraction is directly blended into converter, in converter, add ton quickened lime of steel 15kg and a ton high magnesium lime of steel 12kg, following acid composite fluxing medium working the slag basicity is 3.5, top blast oxygen and argon bottom-blowing blow simultaneously, after blowing 6min, add the acid composite fluxing medium of ton steel 3kg, outwell slag.Wherein, the condition of top blast oxygen comprises: oxygen lance position is 2.8m, and the intensity of top blast oxygen is 2.5m
3/ (ton steel min); The condition of argon bottom-blowing comprises: the intensity of argon bottom-blowing is 0.1m
3/ ton steel min.
(2) then, under the condition blowing at top blast oxygen and argon bottom-blowing, again add ton steel 10kg quickened lime and ton steel 8kg high magnesium lime, following acid composite fluxing medium working the slag basicity is 4, blowing 3min carries out Terminal Process Control, and to obtain temperature be 1630 ℃, carbon content is 0.30 % by weight, and phosphorus content is the endpoint molten steel of 0.006 % by weight; Wherein, the condition of top blast oxygen comprises: oxygen lance position is 2m, and the intensity of top blast oxygen is 3.3m
3/ (ton steel min); The condition of argon bottom-blowing comprises: the intensity of argon bottom-blowing is 0.05m
3/ ton steel min.
From embodiment 1-3, can find out, according to method provided by the invention, effective dephosphorization and protect carbon, thus realize the object of smelting high carbon steel in dephosphorization situation.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a method for semisteel smelting high carbon steel, is characterized in that, the method comprises:
(1) in stove, add quickened lime, high magnesium lime and acid composite fluxing medium be blended into half steel in converter after, top blast oxygen blows, and the basicity of slag in converter is adjusted to 2.5-3.5, after blowing 5-6min, outwell slag, the condition of described top blast oxygen comprises: oxygen supply intensity is 2-3m
3/ (ton steel min), the rifle position of oxygen rifle is 2.5-3m;
(2) under the condition blowing at top blast oxygen, in stove, again add quickened lime, high magnesium lime and acid composite fluxing medium, basicity of slag in converter is adjusted to 3-4, then carries out Terminal Process Control tapping, the condition of described top blast oxygen comprises: oxygen supply intensity is 3-3.5m
3/ (ton steel min), the rifle position of oxygen rifle is 1.8-2.8m.
2. method according to claim 1, wherein, in step (1), the add-on of described quickened lime is 10-15kg/ ton steel, the add-on of described high magnesium lime is 10-12kg/ ton steel.
3. method according to claim 1, wherein, in step (2), the add-on of described quickened lime is 7-10kg/ ton steel, the add-on of described high magnesium lime is 5-8kg/ ton steel.
4. method according to claim 1, wherein, described method is also included in step (1), after blowing 5-6min and outwell before slag, adds the acid composite fluxing medium of 2-3kg/ ton steel.
5. according to the method described in any one in claim 1-3, wherein, content >=85 % by weight of CaO in described quickened lime;
The MgO of the CaO that described high magnesium lime contains 45-55 % by weight and 30-50 % by weight;
The SiO that described acid composite fluxing medium contains 60-75 % by weight
2, the CaO of 10-15 % by weight is, the FeO of the MgO of 1-3 % by weight, 7-15 % by weight and the Fe of 1-37 % by weight
2o
3.
6. method according to claim 1, in step (1) and step (2), converting process also comprises bottom blowing nitrogen or argon gas.
7. method according to claim 6, wherein, in step (1), the intensity of bottom blowing nitrogen or argon gas is 0.08-0.13m
3/ (ton steel min).
8. method according to claim 6, wherein, in step (2), the intensity of bottom blowing nitrogen or argon gas is 0.03-0.05m
3/ (ton steel min).
9. method according to claim 1, wherein, described Terminal Process Control comprises: liquid steel temperature is that in 1600-1630 ℃, molten steel, carbon content is that 0.3-0.55 % by weight and phosphorus content are 0.006-0.018 % by weight.
10. method according to claim 1, wherein, described half steel is the half steel after vanadium extraction.
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| CN113106190A (en) * | 2021-04-09 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Steelmaking method for obtaining high-manganese low-phosphorus molten steel through converter smelting |
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| 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 |
| CN106755713A (en) * | 2016-12-14 | 2017-05-31 | 攀钢集团攀枝花钢钒有限公司 | The method of semisteel smelting high-carbon composition of steel precise control |
| CN106755713B (en) * | 2016-12-14 | 2018-11-23 | 攀钢集团攀枝花钢钒有限公司 | The method that semisteel smelting high-carbon composition of steel accurately controls |
| CN113106190A (en) * | 2021-04-09 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Steelmaking method for obtaining high-manganese low-phosphorus molten steel through converter smelting |
| 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 |
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