CN102796938B - Method for increasing vanadium content of molten steel - Google Patents
Method for increasing vanadium content of molten steel Download PDFInfo
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- CN102796938B CN102796938B CN201210304763.6A CN201210304763A CN102796938B CN 102796938 B CN102796938 B CN 102796938B CN 201210304763 A CN201210304763 A CN 201210304763A CN 102796938 B CN102796938 B CN 102796938B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 36
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 67
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000007670 refining Methods 0.000 claims abstract description 21
- 229910052786 argon Inorganic materials 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 238000005275 alloying Methods 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000004571 lime Substances 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 229910000756 V alloy Inorganic materials 0.000 abstract description 4
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001199 N alloy Inorganic materials 0.000 abstract 1
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 17
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 8
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 4
- 239000013065 commercial product Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a method for increasing vanadium content of molten steel, and is characterized in that: on steel tapping, vanadium slag with V2O5 content of 8-10 wt% is added to the molten steel according to the adding amount of 2-3 Kg per ton of steel in the molten steel alloying process; after steel tapping, a slag forming agent composed of 1-2 kg of a composite deoxidizing agent for per ton of steel, 0.4-0.6 kg of a slag-adjusting agent for per ton of steel and 1.5-2.5 Kg of lime for per ton of steel is added into the molten steel, and the steel ladle cover is closed after adding SiC or aluminum particles on the slag surface according to an amount of 0.2-1.0 Kg per ton of steel; and argon gas or nitrogen gas is used for bottom blowing from the bottom of the steel ladle with a pressure of 0.3-0.4 MPa and a flow rate of 140-160 m<3>/h for 4-6 minutes, and the basicity of the refining slag is controlled to be 2.0-2.8 and the content of oxygen to be 5-20 ppm, making the molten steel with vanadium content increasing from 0.010-0.015 wt%. The method uses vanadium slag instead of vanadium-nitrogen alloy to reduce the amount of vanadium alloy, thereby reducing production cost.
Description
technical field
the present invention relates to steel field of metallurgy, particularly vanadium steel metallurgical technology field.
Background technology
According to statistics, at present China's reinforcing bar annual production maintains 100,000,000 tons of left and right, but the high strength cast iron of intensity more than 400 MPas only accounts for approximately 1/3rd of reinforcing bar ultimate production, and 1,000,000 tons of more than 500 MPas reinforcing bar annual production less thaies.In recent years, it is low that 335 MPa grade reinforcing steels progressively manifest yield strength, for engineering construction, causes the weakness such as its supporting capacity is low, and shock resistance is poor.For the China multiple country of such earthquake, the above high strength cast iron of large-scale promotion 400 MPa, both can reduce the consumption of Constructional Steel, reduces project total cost, can reduce again buildings catastrophic collapsing occurs, thereby reduce to greatest extent the loss of personnel and property.
It is to add the microalloy strengthening elements such as V in molten steel alloying process that current domestic traditional technology is produced 400 MPa reinforcing bar HRB400E series, makes steel have the features such as intensity is large, toughness, wear resistance, good corrosion resistance.But the subject matter that this technique exists is that the alloys such as vanadium nitrogen, vanadium iron are expensive, and production cost is significantly increased, and has tied up the profit margin of enterprise, is unfavorable for the development of enterprise, is more unfavorable for expanding production and the popularization of the above high strength cast iron of 400 MPa.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, provide a kind of utilization vanadium slag that " gives up " to increase vanadium, make the content of vanadium in steel reach equally processing requirement, replace the use of vanadium alloy, the processing method reducing production costs.
The present invention is to provide a kind of like this method that increases molten steel content of vanadium, it is characterized in that through the following step:
When A, tapping, in molten steel alloying process, by the add-on of 2～3Kg/t steel, in molten steel, add V
2o
5content is the vanadium slag of 8～10 wt%;
After B, tapping, in molten steel, drop into composite deoxidant 1～2Kg/t steel+slag supplying agent 0.4～0.6Kg/t steel+lime 1.5～2.5Kg/t steel, to make reductibility refining slag, make this slag cover whole ladle molten iron face, again by the add-on of 0.2～1.0Kg/t steel, on the top of the slag, throw in after SiC or aluminum shot, cover steel ladle cover;
C, from ladle bottom pressure, be 0.3～0.4MPa, flow is 140～160m
3the argon gas of/h or nitrogen bottom blowing 4～6 minutes, controlling refining slag basicity is 2.0～2.8, oxygen level is
5～20 ppm, make molten steel increase vanadium to 0.010～0.015 wt%.
Described composite deoxidant is commercial product.
Described slag supplying agent is commercial product.
Described vanadium slag is commercial product, V wherein
2o
5content is 8～10 wt%.
Compared to the prior art, the invention has the beneficial effects as follows: why can use vanadium slag to replace VN alloy, be to utilize molten steel in the slag treating processes of top, argon station, under the slag reducing atmosphere of top by the V in vanadium slag
2o
5be reduced into free V and enter molten steel, free V can be combined with the nitrogen with stronger avidity, promotion VN, VC separate out austenite-ferrite interface, play the effect of reinforced deposition and crystal grain thinning, also make V content in steel reach processing requirement simultaneously.In intensity, be 400 MPas, rolling specs is during the hot rolled ribbed steel bar of φ≤28 mm is produced, content of vanadium general requirement reaches 0.010～0.020 wt%, by the present invention, add useless vanadium slag, then make reductibility refining slag by ladle, " white slag " being commonly called as, can substitute adding of vanadium alloy completely, make molten steel meet content of vanadium requirement, reduce the consumption of vanadium alloy, reduce production costs.
Embodiment
Below in conjunction with example, the invention will be further described.
Embodiment 1
Produce hot rolled ribbed steel bar HRB400E, rolling specs is φ=28 mm, its Composition Control requires to count C 0.20～0.024, Si 0.20～0.45, Mn 1.25～1.45, P≤0.045, S≤0.045, V 0.010～0.014 with % by weight, and surplus is Fe and inevitable impurity; Tap 55t.Concrete production process is as follows:
When A, tapping, in molten steel alloying process, when throwing in alloy, in molten steel, add V
2o
5content is the vanadium slag 150Kg of 9.72 wt%;
B, gone out steel, molten steel arrives behind argon station, drops into 80Kg composite deoxidant, 30Kg slag supplying agent, 100Kg lime in molten steel, to make reductibility refining slag, makes this slag cover whole ladle molten iron face, adds 30Kg aluminum shot, covers clad on the top of the slag;
C, from ladle bottom pressure, be 0.3MPa, flow is 160m
3the nitrogen bottom blowing of/h 5.5 minutes, controlling refining slag basicity is 2.6, oxygen level is 5.2 ppm, makes molten steel increase vanadium to 0.013 wt%;
D, nitrogen flushing are complete, get ladle refining slag analysis: be canescence, basicity R=2.6.
Molten steel again by tradition pour into a mould, rolling technology, rolling into specification is the hot rolled ribbed steel bar HRB400E of φ 28 mm, its chemical composition is counted with wt%: C 0.21, Si 0.32, Mn 1.37, P 0.035, S 0.038, V0.013, surplus is Fe; Its mechanical property meets technical requirements completely.
Embodiment 2
Produce hot rolled ribbed steel bar HRB400E, rolling specs is φ=28 mm, its Composition Control requires to count C 0.20～0.24, Si 0.20～0.45, Mn 1.25～1.45, P≤0.045, S≤0.045, V 0.010～0.014 with % by weight, and surplus is Fe and inevitable impurity; Tap 55t, production process is as follows:
While A. tapping, in molten steel alloying process, when throwing in alloy, in molten steel, add V
2o
5content is the vanadium slag 130Kg of 9.8 wt%;
B. gone out steel, molten steel arrives behind argon station, drops into 55Kg composite deoxidant, 22Kg slag supplying agent, 137Kg lime in molten steel, to make reductibility refining slag, makes this slag cover whole ladle molten iron face, adds 11Kg SiC on the top of the slag, covers clad;
C. from ladle bottom pressure, be 0.4MPa, flow is 140m
3the nitrogen bottom blowing of/h 4 minutes, controlling refining slag basicity is 2.8, oxygen level is 15.7 ppm, makes molten steel increase vanadium to 0.011 wt%;
d.nitrogen flushing is complete, gets ladle refining slag analysis: be canescence, basicity R=2.8.
Molten steel again by tradition pour into a mould, rolling technology, rolling into specification is the hot rolled ribbed steel bar HRB400E of φ 28 mm, its chemical composition is counted with wt%: C 0.22, Si 0.35, Mn 1.31, P 0.026, S 0.030, V 0.011, surplus is Fe; Its mechanical property meets technical requirements completely.
Embodiment 3
Produce hot rolled ribbed steel bar HRB500E, rolling specs is φ=12 mm, its Composition Control requires to count C 0.19～0.25, Si 0.35～0.55, Mn 1.25～1.50, P≤0.045, S≤0.045, V 0.020～0.030, Nb 0.020～0.030 with wt%, and surplus is Fe and inevitable impurity; The about 55t of tap.Production process is as follows:
While A. tapping, in molten steel alloying process, when throwing in alloy, in molten steel, add V
2o
5content is the vanadium slag 150Kg of 9.05 wt%;
B. gone out steel, molten steel arrives behind argon station, drops into 110Kg composite deoxidant, 33Kg slag supplying agent, 82Kg lime in molten steel, to make reductibility refining slag, makes this slag cover whole ladle molten iron face, adds 20Kg aluminum shot, covers clad on the top of the slag;
C. from ladle bottom pressure, be 0.35MPa, flow is 150m
3the argon gas bottom blowing of/h 6 minutes, controlling refining slag basicity is 2.0, oxygen level is 8.7 ppm, makes molten steel increase on the original basis vanadium 0.015 wt%;
d.nitrogen flushing is complete, gets ladle refining slag analysis: be canescence, basicity R=2.0.
Molten steel again by tradition pour into a mould, rolling technology, rolling into specification is the hot rolled ribbed steel bar HRB500E of φ 12 mm, its chemical composition is: C 0.22 wt%, Si 0.43 wt%; Mn 1.40 wt%, P 0.028 wt%, S 0.036 wt%; V0.025 wt%, Nb0.026 wt%, surplus is Fe; Its mechanical property meets technical requirements completely.
Embodiment 4
Produce hot rolled ribbed steel bar HRB400E, rolling specs is φ=28 mm, its Composition Control requires to count with wt%: C 0.20～0.24, Si 0.20～0.45, Mn 1.25～1.45, P≤0.045, S≤0.045, V 0.010～0.014, and surplus is Fe and inevitable impurity; Tap 55t, production process is as follows:
While A. tapping, in molten steel alloying process, when throwing in alloy, in molten steel, add V
2o
5content is
10.0the vanadium slag 110Kg of wt%;
B. gone out steel, molten steel arrives behind argon station, in molten steel, drop into 55Kg composite deoxidant, 22Kg slag supplying agent,
82.5kg lime, to make reductibility refining slag, makes this slag cover whole ladle molten iron face, adds 55KgSiC on the top of the slag, covers clad;
C. from ladle bottom pressure, be 0.4MPa, flow is 140m
3the argon gas bottom blowing of/h 5 minutes, controlling refining slag basicity is 2.1, oxygen level is 20ppm, makes molten steel increase vanadium to 0.010 wt%;
D. nitrogen flushing is complete, gets ladle refining slag analysis: be canescence, basicity R=2.1.
Molten steel again by tradition pour into a mould, rolling technology, rolling into specification is the hot rolled ribbed steel bar HRB400E of φ 28 mm, its chemical composition is counted with wt%: C 0.22, Si 0.35, Mn 1.31, P 0.026, S 0.030, V 0.010, surplus is Fe; Its mechanical property meets technical requirements completely.
Embodiment 5
Produce hot rolled ribbed steel bar HRB400E, rolling specs is φ=28 mm, its Composition Control requires to count C 0.20～0.24, Si 0.20～0.45, Mn 1.25～1.45, P≤0.045, S≤0.045, V 0.010～0.014 with wt%, and surplus is Fe and inevitable impurity; Tap 55t, production process is as follows:
While A. tapping, in molten steel alloying process, when throwing in alloy, in molten steel, add V
2o
5content is
8.02the vanadium slag 165Kg of wt%;
B. gone out steel, molten steel arrives behind argon station, drops into 110Kg composite deoxidant, 33Kg slag supplying agent, 120Kg lime in molten steel, to make reductibility refining slag, makes this slag cover whole ladle molten iron face, adds 22Kg aluminum shot, covers clad on the top of the slag;
C. from ladle bottom pressure, be 0.4MPa, flow is 140m
3the nitrogen bottom blowing of/h 5 minutes, controlling refining slag basicity is 2.7, oxygen level is 16.7 ppm, makes molten steel increase vanadium to 0.014 wt%;
d.nitrogen flushing is complete, gets ladle refining slag analysis: be canescence, basicity R=2.7.
Molten steel again by tradition pour into a mould, rolling technology, rolling into specification is the hot rolled ribbed steel bar HRB400E of φ 28 mm, its chemical composition is counted with wt%: C 0.22, Si 0.35, Mn 1.31, P 0.026, S 0.030, V 0.014, surplus is Fe; Its mechanical property meets technical requirements completely.
Effect comparison:
Economic benefit: take produce rolling specs as φ 28mm hot rolled ribbed steel bar HRB400E be example, common process is in every stove steel, to add 9 ㎏ VN-80 alloys (tap is by 55 tons) at alloying process, its market price is 140,000 yuan/ton at present, uses the ton steel cost of VN alloy to be:
55 tons=22.91 yuan/ton of 0.009 ton * 140000 yuan/ton ÷;
Grade is that 8～10wt% vanadium slag explant price is 3000 yuan/ton at present, produces the every stove of HRB400E and adds vanadium slag 150 ㎏, and the cost that uses vanadium slag to produce HRB400E is:
55 tons=10.91 yuan/ton of 0.15 ton * 4000 yuan/ton ÷;
Use vanadium slag to replace VN alloy to produce structural low alloy steel HRB400E, 12 yuan of ton steel cost declines (22.91-10.91=12 unit).
Social benefit: the invention solves in prior art high strength cast iron production cost higher, enterprise produces the problem such as be short of power, for expanding production and promote high strength cast iron and play a role in promoting.
Claims (1)
1. increase a method for molten steel content of vanadium, it is characterized in that through the following step:
When A, tapping, in molten steel alloying process, by the add-on of 2～3Kg/t steel, in the molten steel of producing hot rolled ribbed steel bar HRB400E and HRB500E, add V
2o
5content is the vanadium slag of 8～10 wt%;
After B, tapping, in the molten steel of steps A, drop into following slag former: composite deoxidant 1～2Kg/t steel+slag supplying agent 0.4～0.6Kg/t steel+lime 1.5～2.5Kg/t steel, to make reductibility refining slag, make this slag cover whole ladle molten iron face, again by the add-on of 0.2～1.0Kg/t steel, on the top of the slag, throw in after SiC or aluminum shot, cover steel ladle cover;
C, from ladle bottom pressure, be 0.3～0.4MPa, flow is 140～160m
3the argon gas of/h or nitrogen bottom blowing 4～6 minutes, controlling refining slag basicity is 2.0～2.8, oxygen level is
5～20 ppm, make molten steel increase vanadium to 0.010～0.015 wt%.
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| CN201210304763.6A CN102796938B (en) | 2012-08-25 | 2012-08-25 | Method for increasing vanadium content of molten steel |
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| CN102796938B true CN102796938B (en) | 2014-04-02 |
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| CN103820597B (en) * | 2014-02-20 | 2015-07-01 | 河北钢铁股份有限公司承德分公司 | Efficient utilization method of residual vanadium in semisteel |
| CN104694707A (en) * | 2015-02-16 | 2015-06-10 | 河北钢铁股份有限公司承德分公司 | Method for alloying vanadium and nitrogen by using vanadium-containing slag and nitrogen |
| CN105039646A (en) * | 2015-08-25 | 2015-11-11 | 王先玉 | Processing method for SCR denitration catalyst |
| CN112063803A (en) * | 2020-08-05 | 2020-12-11 | 新兴铸管股份有限公司 | Method for reducing vanadium element in slag of refining furnace |
| CN113122678B (en) * | 2021-03-31 | 2022-07-12 | 武钢集团昆明钢铁股份有限公司 | Smelting method for increasing vanadium and making steel by using vanadium slag |
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| CN101775538B (en) * | 2010-03-24 | 2012-02-15 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
| CN102618691B (en) * | 2012-04-16 | 2014-07-02 | 四川省达州钢铁集团有限责任公司 | Method for producing HRB 600 high-strength steel through micro-alloying |
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