CN103469048A - Boron-containing steel boron alloying treatment method - Google Patents
Boron-containing steel boron alloying treatment method Download PDFInfo
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- CN103469048A CN103469048A CN2013104022518A CN201310402251A CN103469048A CN 103469048 A CN103469048 A CN 103469048A CN 2013104022518 A CN2013104022518 A CN 2013104022518A CN 201310402251 A CN201310402251 A CN 201310402251A CN 103469048 A CN103469048 A CN 103469048A
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Abstract
The invention provides a boron-containing steel boron alloying treatment method. The method comprises the steps that paigeite is added to sintering ores, wherein the addition proportion is 0.01-0.1% according to the mass percentage of boron in the sintering ores after ore proportioning; molten iron is desulfurized according to the upper limit of a target value and slagging off treatment is carried out after desulfurization; slagging off treatment is not carried out in the converter blowing process, wherein the tapping slag amount in the tapping process is 5-10kg/t of steel; a graphite electrode for an LF (ladle furnace) heats the molten steel to melt slag charges, argon is subjected to bottom blowing in the heating process, after the slag charges are completely molten, the bottom blown argon flow is increased and a deoxidant is added to a ladle, then temperature measurement, sampling and alloying are carried out and the total mass percentage of FeO and MnO in the slag is ensured to be not more than 2.0% after refining is completed. The method not only is beneficial to improving the strength of the sintering ores, improving the reducibility of the sintering ores and reducing the pulverization rate but also can achieve boron alloying of molten steel, reduce the molten steel boron alloying treatment cost and avoid environmental pollution.
Description
Technical field
The invention belongs to the smelting technology technical field, particularly a kind for the treatment of process of the boron alloy for boron-containing steel.
Background technology
Because the thermal conductivity of boron is very large, so to add the effect of trace B element (boron content is generally 0.0005%～0.0035%) in steel be generally in order to improve the hardening capacity of steel.But the chemical property of boron is more active simultaneously, the avidity of itself and oxygen and element silicon approach, and slightly inferior to aluminium, with the avidity of nitrogen, are better than titanium and are weaker than aluminium, in molten steel alloying and process of setting very easily with steel in the element reaction such as oxygen, nitrogen, thereby cause the recovery rate of boron lower and unstable.The most employings of molten steel boron alloyization at present add the modes of 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, the total amount of FeO and MnO≤2.0% in LF refining end assurance 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, the total amount of control LF final slag composition FeO and MnO≤1.5%, SiO
2content≤15%, after this add ferro-boron or feeding ferro-boron cored-wire, finally carries out the VD vacuum-treat, and 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, the metallargist has carried out extensive work around the comprehensive utilization of paigeite resource, in agglomerate, with addition of paigeite, becomes one of wherein important research direction.Document 1 " metallurgical performance that adds boron MgO matter acid pellet " (Zhu Jiaji, Yang Zhaoxiang. agglomerates of sintered pellets, 1993, (2): 1-6.), point out: using low-grade ludwigite as sintering with the additive in pellet formation, can reduce maturing temperature, 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]. the mineral products comprehensive utilization, 2006,2:33-37.) introduce: the interpolation of boron can suppress
β-2CaOSiO
2crystal conversion, B
2o
3can form sosoloid and reduce fusing point, the formation of liquid phase in the acceleration of sintering process, the B that radius is very little with many oxide compounds
3+can diffuse into
β-2CaOSiO
2in, in process of cooling not with
γ-2CaOSiO
2therefore separate out, can effectively reduce the 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., the Huadong Metallurgy College journal, 1997,14 (3): 262-266) carried out the experimental study that paigeite adds pelletizing and agglomerate, result shows to add after paigeite the intensity that has improved pelletizing and agglomerate, improve the reductibility of agglomerate, reduced Pulverization ratio.
Comprehensively above-mentioned, the deficiency of existing boron alloy metallization processes is that the cost of ferro-boron and boron line is higher, simultaneously ferro-boron and boron line preparation process energy consumption is higher and contaminate environment.In addition, agglomerate, after paigeite, will certainly enter in molten iron by some boron, and that this part boron has is how many residual in molten steel, also lacks at present further investigation.
Summary of the invention
The invention provides a kind of boron-containing steel boron alloy treatment process, its purpose one is to improve the intensity of agglomerate, improves the reductibility of agglomerate, reduces the Pulverization ratio of agglomerate; The 2nd, utilize the oxidation in blast furnace, converter, LF refining process of boron in paigeite and reduction reaction to make during its part enters molten steel, to realize the boron alloy to molten steel, reduce molten steel boron alloy processing cost.
For this reason, the solution that the present invention takes is:
A kind of boron-containing steel boron alloy treatment process, its concrete treatment step is:
1, in agglomerate with addition of paigeite, with addition of ratio, according to the boron-containing quantity of paigeite, adjusted, joining behind ore deposit boron quality percentage composition in agglomerate is 0.01%～0.1%.
2, blast-furnace smelting: blast furnace is according to routine operation, 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 according to target is worth the upper limit to be processed, and the processing of being skimmed after desulfurizing iron prevents that the boracic slag does not enter in converter, also can dilute the concentration of boron in converter slag when easily causing splash.
4, bessemerize: bessemerize in process the processing of not skimmed, boron its objective is because can enter in slag more than 95% in the process of bessemerizing, if skim, be equivalent to reduce the concentration of boron in converter slag, be unfavorable for that the boron that increases of follow-up LF refining process molten steel is processed.Converter tapping process does not stay steel, and under tapping process, the quantity of slag, at 5～10kg/t steel, makes the boron in slag enter in ladle with slag under converter.
5, LF refining: with Graphite Electrodes, to molten steel, heating makes the slag charge fusing, and in heat-processed, the argon bottom-blowing flow is 0.05～0.1Nm
3h
-1t
-1; After slag charge melts fully, increase argon bottom-blowing flow to 0.3～0.5Nm
3h
-1t
-1and in ladle, adding reductor to carry out deep deoxidation according to steel 1～2kg per ton, the bottom blowing churning time is 5～10min, utilizes the intense mixing between slag, realize the purpose of boron oxide in the aluminium element reducing slag in molten steel, the boron reduction in slag is entered in molten steel.After this carry out thermometric, sampling, alloying, the quality percentage composition sum of FeO and MnO≤2.0% in refining end assurance slag, molten steel dissolved oxygen activity≤10 * 10
-6.
As further extension of the present invention, after the LF refining, also can adopt VD to process, the treating processes vacuum degree control is at 67～100Pa, and the 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 improve on the one hand the intensity of agglomerate, improve the reductibility of agglomerate, reduce the effect of its Pulverization ratio, also utilize the oxidation in blast furnace, converter, LF refining process of boron in paigeite and reduction reaction to make during its part enters molten steel, to realize the boron alloy to molten steel, when improving sintering performance simultaneously, reduce molten steel boron alloy processing cost, and can avoid environmental pollution.
Embodiment
Embodiment 1:
1, in agglomerate with addition of 5% paigeite, with addition of the composition of agglomerate after paigeite 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 content is 0.0080%.
3, molten iron pretreatment desulfurizing, after processing, molten steel sulfur content is 0.01%, after desulfurization, skims, and guarantees that the molten iron face is without the bulk residue.
4, bessemerize.Bessemerize and adopt single slag process to smelt, converting process is not skimmed, and the boron more than 95% enters in converter slag, and converter tapping molten steel boron content is 0.0001%.Under converter tapping, the quantity of slag is estimated as the 8kg/t steel, and converter tapping quantity is 100t, and tapping process adds the 50kg aluminum shot to carry out deoxidation of molten steel in ladle.
5, LF refining.After molten steel is moved into the LF treatment station, add lime 0.8t, bauxitic clay 0.1t, aluminium 0.1t, utilize the Graphite Electrodes slag to process, control voltage is 435V, electric current 50000A, and in heat-processed, the argon bottom-blowing flow is 0.065Nm
3h
-1t
-1; After the slag charge fusing, increase the argon bottom-blowing flow to 0.45Nm
3h
-1t
-1, and again add aluminium 50kg in ladle, bottom blowing churning time 8min.Thermometric, sampling, alloying, the mass percent sum 1.65% of FeO and MnO in refining end slag, molten steel dissolved oxygen activity 7 * 10
-6, upper machine casting after line feeding.
Embodiment 1 converter tapping molten steel boron content is that 0.0001%, LF refining starts boron content 0.08% in ladle top slag.After the LF refining finishes, molten steel boron content is 0.0007%, and in the slag of top, boron content is 0.002%.
Embodiment 2:
1, in agglomerate with addition of 5% paigeite, as follows with addition of the composition of agglomerate after paigeite:
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 content is 0.0060%.
3, molten iron pretreatment desulfurizing, after processing, molten steel sulfur content is 0.015%, after desulfurization, skims, and guarantees that the molten iron face is without the bulk residue.
4, bessemerize.Bessemerize and adopt single slag process to smelt, converting process is not skimmed, and the boron more than 95% enters in converter slag, and converter tapping boron content is 0.0001%.Under converter tapping, the quantity of slag is estimated as the 7kg/t steel, and converter tapping quantity is 100t.
5, LF refining.After molten steel is moved into the LF treatment station, add lime 1.0t, bauxitic clay 0.2t, aluminium 0.15t, utilize the Graphite Electrodes slag to process, control voltage is 435V, electric current 50000A, and in heat-processed, the argon bottom-blowing flow is 0.08Nm
3h
-1t
-1; After the slag charge fusing, increase the argon bottom-blowing flow to 0.47Nm
3h
-1t
-1, bottom blowing churning time 8.5min.Thermometric, sampling, alloying, it is 1595 ℃ that molten steel is taken out of temperature.
6, ladle is transported to the VD station, molten steel is carried out to vacuum-treat.Vacuum tightness is 67Pa, and the argon bottom-blowing flow is 20Nm
3/ h, 13 minutes treatment times.The mass percent sum 1.25% of FeO and MnO in refining end slag, molten steel dissolved oxygen activity 3 * 10
-6.
Embodiment 2 converter tapping molten steel boron content are that 0.0001%, LF refining starts boron content 0.06% in ladle top slag.After the LF refining finishes, molten steel boron content is 0.0005%, and in the slag of top, boron content is 0.001%.
Claims (2)
1. a boron-containing steel boron alloy treatment process, is characterized in that, concrete treatment step is:
(1), in agglomerate with addition of paigeite, with addition of ratio, according to the boron-containing quantity of paigeite, adjusted, joining behind ore deposit boron quality percentage composition in agglomerate is 0.01%～0.1%;
(2), blast-furnace smelting: blast furnace is according to routine operation, 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 according to target is worth the upper limit to be processed, and the processing of being skimmed after desulfurizing iron prevents that the boracic slag does not enter in converter;
(4), bessemerize: bessemerize in process the processing of not skimmed, converter tapping process does not stay steel, and under tapping process, the quantity of slag, at 5～10kg/t steel, makes the boron in slag enter in ladle with slag under converter;
(5), LF refining: with Graphite Electrodes, to molten steel, heating makes the slag charge fusing, and in heat-processed, the argon bottom-blowing flow is 0.05～0.1Nm
3h
-1t
-1; After slag charge melts fully, increase argon bottom-blowing flow to 0.3～0.5 Nm
3h
-1t
-1, and in ladle, adding reductor to carry out deep deoxidation according to steel 1～2kg per ton, the bottom blowing churning time is 5～10min; After this carry out thermometric, sampling, alloying, the mass percent sum of FeO and MnO≤2.0% in refining end assurance slag, molten steel dissolved oxygen activity≤10 * 10
-6.
2. boron-containing steel boron alloy treatment process according to claim 1, is characterized in that, after the LF refining, adopts VD to process, and the treating processes vacuum degree control is at 67～100Pa, and the argon bottom-blowing flow is 0.09～0.3 Nm
3h
-1t
-1, treatment time 10～20min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039632A (en) * | 2015-07-27 | 2015-11-11 | 武汉钢铁(集团)公司 | Method for increasing yield of B in smelting of steel for 20MnTiB high-strength fasteners |
| CN112662867A (en) * | 2020-12-11 | 2021-04-16 | 四川德胜集团钒钛有限公司 | Sintering method for recycling steel slag |
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2013
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Patent Citations (4)
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| 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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|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039632A (en) * | 2015-07-27 | 2015-11-11 | 武汉钢铁(集团)公司 | Method for increasing yield of B in smelting of steel for 20MnTiB high-strength fasteners |
| CN112662867A (en) * | 2020-12-11 | 2021-04-16 | 四川德胜集团钒钛有限公司 | Sintering method for recycling steel slag |
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