CN103469048B - The boron alloyed treatment process of a kind of boron-containing steel - Google Patents
The boron alloyed treatment process of a kind of boron-containing steel Download PDFInfo
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- CN103469048B CN103469048B CN201310402251.8A CN201310402251A CN103469048B CN 103469048 B CN103469048 B CN 103469048B CN 201310402251 A CN201310402251 A CN 201310402251A CN 103469048 B CN103469048 B CN 103469048B
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Abstract
The invention provides the boron alloyed treatment process of a kind of boron-containing steel, with addition of paigeite in agglomerate, is 0.01% ~ 0.1% with addition of ratio by boron mass percentage in agglomerate after joining ore deposit; Desulfurizing iron is according to target worth upper limit process, carries out process of skimming after desulfurization; Bessemerize in process and do not carry out taking off Slag treatment, under tapping process, the quantity of slag is at 5 ~ 10kg/t steel; LF Graphite Electrodes makes slag charge melt to molten steel heating, argon bottom-blowing in heat-processed, after slag charge melts completely, increase argon bottom-blowing flow, and reductor is added in ladle, after this carry out thermometric, sampling, alloying, refining terminates mass percentage sum≤2.0% ensureing FeO and MnO in slag.The present invention is not only conducive to improving the intensity of agglomerate, improves the reductibility of agglomerate, reduces Pulverization ratio, and it is boron alloyed to realize molten steel, reduces the boron alloyed processing cost of molten steel, and avoids environmental pollution.
Description
Technical field
The invention belongs to smelting technology technical field, particularly a kind of boron alloyed treatment process for boron-containing steel.
Background technology
Because the thermal conductivity of boron is very large, the effect therefore adding trace B element (Boron contents is generally 0.0005% ~ 0.0035%) in steel is generally the hardening capacity in order to improve steel.But the chemical property of boron is more active simultaneously, avidity and the element silicon of itself and oxygen are close, slightly inferior to aluminium, be better than titanium and be weaker than aluminium with the avidity of nitrogen, in molten steel alloying and process of setting very easily with the element reactions such as the oxygen in steel, nitrogen, thus cause the recovery rate of boron lower and unstable.The boron alloyed majority of current molten steel adopts the mode adding ferro-boron or boron line, and the abundant deoxidation of molten steel, fixed nitrogen before ferro-boron adds, guarantee that boron has higher recovery rate.Chinese Patent Application No. 200710049005.3 discloses a kind of method of converter smelting boron steel, the method adopts the method for converter smelting → ladle deoxidation → LF refining → continuous casting to produce boron steel, LF refining terminates total amount≤2.0% ensureing FeO and MnO in slag, molten steel dissolved oxygen activity≤10 × 10
-6, after this add ferrotianium, ferro-boron, the recovery rate of boron is 69.4% ~ 91.8%.The boron-containing steel that Chinese Patent Application No. 200810015497.9 is introduced is smelted and is adopted converter → LF → VD production technique, total amount≤1.5% of control LF final slag composition FeO and MnO, SiO
2content≤15%, after this add ferro-boron or feeding ferro-boron cored-wire, finally carry out VD vacuum-treat, the boron rate of recovery is stabilized in more than 90%.
As everyone knows, China's boron resource reserves occupy the 5th, the world, and wherein paigeite accounts for the over half of boron resource.For many years, metallargist has carried out extensive work around the comprehensive utilization of paigeite resource, in agglomerate, become one of wherein important research direction with addition of paigeite.Document 1 " adding the metallurgical performance of boron MgO matter acid pellet " (Zhu Jiaji, Yang Zhaoxiang. agglomerates of sintered pellets, 1993, (2) point out: 1-6.): using low-grade ludwigite as the additive in sintering and pellet formation, maturing temperature can be reduced, reduce energy consumption, improve product strength and yield rate, improve quality product and metallurgical performance.Document 2 " paigeite comprehensive utilization overview and prospect " (Liu Ran, Xue Xiangxin, Jiang Tao etc. [J]. mineral products fully utilize, 2006,2:33-37.) to introduce: the interpolation of boron can suppress
β-2CaOSiO
2crystal conversion, B
2o
3can sosoloid be formed with many oxide compounds and reduce fusing point, the formation of liquid phase in acceleration of sintering process, the B that radius is very little
3+can diffuse into
β-2CaOSiO
2in, in process of cooling not with
γ-2CaOSiO
2separate out, therefore can effectively reduce agglomerate volumetric expansion and form a large amount of powder.Document 3 " activation of paigeite comprehensive utilization-boron concentrate and ferro-boron concentrate improve the mechanism of agglomerates of sintered pellets " (Zhao Qingjie, what Changqing, brilliant brightness., Huadong Metallurgy College journal, 1997,14 (3): 262-266) carried out the experimental study that paigeite adds pelletizing and agglomerate, result improves the intensity of pelletizing and agglomerate after showing to add paigeite, improve the reductibility of agglomerate, reduce Pulverization ratio.
Comprehensively above-mentioned, the deficiency of existing boron alloyed technique is that the cost of ferro-boron and boron line is higher, simultaneously ferro-boron and the higher and contaminate environment of boron line preparation process energy consumption.In addition, agglomerate, after paigeite, will certainly enter in molten iron by some boron, and this part boron has and how much remains in molten steel, also lacks further investigation at present.
Summary of the invention
The invention provides the boron alloyed treatment process of a kind of boron-containing steel, its object one improves the intensity of agglomerate, improves the reductibility of agglomerate, reduces the Pulverization ratio of agglomerate; Two is that the oxidation that utilizes the boron in paigeite in blast furnace, converter, LF refining process and reduction reaction make its part enter in molten steel, and what realize molten steel is boron alloyed, reduces the boron alloyed processing cost of molten steel.
For this reason, the solution that the present invention takes is:
The boron alloyed treatment process of a kind of boron-containing steel, its concrete treatment step is:
1, in agglomerate with addition of paigeite, adjust with addition of the boron-containing quantity of ratio according to paigeite, after joining ore deposit, in agglomerate, boron mass percentage is 0.01% ~ 0.1%.
2, blast-furnace smelting: blast furnace conveniently operates, agglomerate participates in the reduction reaction in blast furnace in blast furnace, and a part of boron volatilizees or enters in blast furnace slag, and another part boron enters in molten iron.
3, molten iron pretreatment desulfurizing: desulfurizing iron is according to target worth the upper limit and processes, and carries out process of skimming after desulfurizing iron, prevents not boracic slag from entering in converter, also can dilute the concentration of boron in converter slag while easily causing splash.
4, bessemerize: bessemerize in process and do not carry out taking off Slag treatment, its objective is because boron more than 95% to enter in slag in the process of bessemerizing, if skimmed, be then equivalent to reduce the concentration of boron in converter slag, be unfavorable for the increasing boron process of follow-up LF refining process molten steel.Converter tapping process does not stay steel, and under tapping process, the quantity of slag is at 5 ~ 10kg/t steel, and the boron in slag is entered in ladle with converter slag.
5, LF refining: to molten steel heating, slag charge is melted with Graphite Electrodes, in heat-processed, argon bottom-blowing flow is 0.05 ~ 0.1Nm
3h
-1t
-1; After slag charge melts completely, increase argon bottom-blowing flow to 0.3 ~ 0.5Nm
3h
-1t
-1and in ladle, add reductor according to steel 1 ~ 2kg per ton and carry out deep deoxidation, the bottom blowing stirring time is 5 ~ 10min, utilizes the intense mixing between slag, realize the object of boron oxide in the aluminium element reducing slag in molten steel, the boron in slag is reduced and enters in molten steel.After this carry out thermometric, sampling, alloying, refining terminates mass percentage sum≤2.0% ensureing FeO and MnO in slag, molten steel dissolved oxygen activity≤10 × 10
-6.
As further extension of the present invention, after LF refining, also can adopt VD process, treating processes vacuum degree control is at 67 ~ 100Pa, and argon bottom-blowing flow is 0.09 ~ 0.3Nm
3h
-1t
-1, treatment time 10 ~ 20min.
Beneficial effect of the present invention is:
The present invention in agglomerate with addition of certain paigeite, be conducive to the intensity improving agglomerate on the one hand, improve the reductibility of agglomerate, reduce the effect of its Pulverization ratio, also utilize the oxidation of the boron in paigeite in blast furnace, converter, LF refining process and reduction reaction to make its part enter in molten steel, what realize molten steel is boron alloyed, while raising sintering performance simultaneously, reduce the boron alloyed processing cost of molten steel, and can environmental pollution be avoided.
Embodiment
Embodiment 1:
1, in agglomerate with addition of the paigeite of 5%, after paigeite, the composition of agglomerate is as table 1:
Table 1 is with addition of Sinter Component mass percentage content table % after paigeite
| TFe | FeO | CaO | SiO 2 | MgO | Al 2O 3 | B | Surplus | R |
| 55.14 | 8.40 | 11.61 | 5.91 | 1.62 | 0.89 | 0.0473 | Impurity | 1.965 |
2, after blast furnace, molten iron Boron contents is 0.0080%.
3, molten iron pretreatment desulfurizing, after process, molten steel sulfur content is 0.01%, skims after desulfurization, ensures that molten iron face is without bulk residue.
4, bessemerize.Bessemerize and adopt single slag process to smelt, namely converting process is not skimmed, and the boron of more than 95% enters in converter slag, and converter tapping molten steel Boron contents is 0.0001%.Under converter tapping, the quantity of slag is estimated as 8kg/t steel, and converter tapping quantity is 100t, and tapping process adds 50kg aluminum shot and carries out deoxidation of molten steel in ladle.
5, LF refining.After LF treatment station moved into by molten steel, add lime 0.8t, bauxitic clay 0.1t, aluminium 0.1t, utilize carrying out of Graphite Electrodes Slag treatment, control voltage is 435V, electric current 50000A, and in heat-processed, argon bottom-blowing flow is 0.065Nm
3h
-1t
-1; After slag charge fusing, increase argon bottom-blowing flow to 0.45Nm
3h
-1t
-1, and in ladle, again add aluminium 50kg, bottom blowing stirring time 8min.Thermometric, sampling, alloying, refining terminates the mass percent sum 1.65% of FeO and MnO in slag, molten steel dissolved oxygen activity 7 × 10
-6, upper machine casting after line feeding.
Embodiment 1 converter tapping molten steel Boron contents is that 0.0001%, LF refining starts boron content 0.08% in ladle top slag.It is 0.0007% that LF refining terminates rear molten steel Boron contents, and in the slag of top, boron content is 0.002%.
Embodiment 2:
1, in agglomerate with addition of the paigeite of 5%, after paigeite, the composition of agglomerate is as follows:
Table 2 is with addition of Sinter Component mass percentage content table % after paigeite
| TFe | FeO | CaO | SiO 2 | MgO | Al 2O 3 | B | Surplus | R |
| 55.20 | 8.91 | 12.16 | 6.23 | 1.74 | 0.91 | 0.0458 | Impurity | 1.953 |
2, after blast furnace, molten iron Boron contents is 0.0060%.
3, molten iron pretreatment desulfurizing, after process, molten steel sulfur content is 0.015%, skims after desulfurization, ensures that molten iron face is without bulk residue.
4, bessemerize.Bessemerize and adopt single slag process to smelt, namely converting process is not skimmed, and the boron of more than 95% enters in converter slag, and converter tapping Boron contents is 0.0001%.Under converter tapping, the quantity of slag is estimated as 7kg/t steel, and converter tapping quantity is 100t.
5, LF refining.After LF treatment station moved into by molten steel, add lime 1.0t, bauxitic clay 0.2t, aluminium 0.15t, utilize carrying out of Graphite Electrodes Slag treatment, control voltage is 435V, electric current 50000A, and in heat-processed, argon bottom-blowing flow is 0.08Nm
3h
-1t
-1; After slag charge fusing, increase argon bottom-blowing flow to 0.47Nm
3h
-1t
-1, bottom blowing stirring time 8.5min.Thermometric, sampling, alloying, it is 1595 DEG C that molten steel takes out of temperature.
6, ladle is transported to VD station, vacuum-treat is carried out to molten steel.Vacuum tightness is 67Pa, and argon bottom-blowing flow is 20Nm
3/ h, 13 minutes treatment times.Refining terminates the mass percent sum 1.25% of FeO and MnO in slag, molten steel dissolved oxygen activity 3 × 10
-6.
Embodiment 2 converter tapping molten steel Boron contents is that 0.0001%, LF refining starts boron content 0.06% in ladle top slag.It is 0.0005% that LF refining terminates rear molten steel Boron contents, and in the slag of top, boron content is 0.001%.
Claims (2)
1. the boron alloyed treatment process of boron-containing steel, is characterized in that, concrete treatment step is:
(1), in agglomerate with addition of paigeite, adjust with addition of the boron-containing quantity of ratio according to paigeite, after joining ore deposit, in agglomerate, boron mass percentage is 0.01% ~ 0.1%;
(2), blast-furnace smelting: blast furnace conveniently operates, and agglomerate participates in the reduction reaction in blast furnace in blast furnace, and a part of boron volatilizees or enters in blast furnace slag, and another part boron enters in molten iron;
(3), molten iron pretreatment desulfurizing: desulfurizing iron is according to target worth the upper limit and processes, and carries out process of skimming after desulfurizing iron, prevents not boracic slag from entering in converter;
(4), bessemerize: bessemerize in process and do not carry out taking off Slag treatment, converter tapping process does not stay steel, and under tapping process, the quantity of slag is at 5 ~ 10kg/t steel, makes the boron in slag enter in ladle with converter slag;
(5), LF refining: add lime 8 ~ 10kg/ ton steel, bauxitic clay 1 ~ 2kg/ ton steel and aluminium 1 ~ 1.5kg/ ton steel in ladle, to molten steel heating, slag charge is melted with Graphite Electrodes, in heat-processed, argon bottom-blowing flow is 0.05 ~ 0.1Nm
3h
-1t
-1; After slag charge melts completely, increase argon bottom-blowing flow to 0.3 ~ 0.5Nm
3h
-1t
-1, and in ladle, add reductor metallic aluminium according to steel 1 ~ 2kg per ton and carry out deep deoxidation, the bottom blowing stirring time is 5 ~ 10min; After this carry out thermometric, sampling, alloying, refining terminates mass percent sum≤2.0% ensureing FeO and MnO in slag, molten steel dissolved oxygen activity≤10 × 10
-6.
2. the boron alloyed treatment process of boron-containing steel according to claim 1, is characterized in that, adopts VD process after LF refining, and treating processes vacuum degree control is at 67 ~ 100Pa, and argon bottom-blowing flow is 0.09 ~ 0.3Nm
3h
-1t
-1, treatment time 10 ~ 20min.
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| CN101565792A (en) * | 2009-06-09 | 2009-10-28 | 东北大学 | Method for smelting boron steel |
| CN102936636A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
-
2013
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Patent Citations (4)
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| JPH06299224A (en) * | 1993-04-09 | 1994-10-25 | Nippon Steel Corp | Production of molten steel for continuous casting |
| CN1600884A (en) * | 2004-09-01 | 2005-03-30 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
| CN101565792A (en) * | 2009-06-09 | 2009-10-28 | 东北大学 | Method for smelting boron steel |
| CN102936636A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
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| 富硼渣综合利用试验研究;李金生;《矿产综合利用》;20130628(第3期);全文 * |
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| 鞍钢铁水脱硫技术的分析;刘宇 等;《鞍钢技术》;20081010(第5期);全文 * |
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