CN103225034A - Method for improving yielding rate of ultra pure ferrite stainless steel titanium - Google Patents
Method for improving yielding rate of ultra pure ferrite stainless steel titanium Download PDFInfo
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- CN103225034A CN103225034A CN2013101448307A CN201310144830A CN103225034A CN 103225034 A CN103225034 A CN 103225034A CN 2013101448307 A CN2013101448307 A CN 2013101448307A CN 201310144830 A CN201310144830 A CN 201310144830A CN 103225034 A CN103225034 A CN 103225034A
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Abstract
The invention relates to a method for improving yielding rate of ultra pure ferrite stainless steel titanium, which is characterized in that the method comprises the following steps: I carrying out oxygen blowing and decarburization operations in a vacuum finery for molten steel after being smelted in a converter, and the oxygen blowing amount for each kilogram of carbon is less than 2.2 cubic meters; wherein, the percent of Cr in the molten steel which is poured from the converter into the vacuum finery is 17-22%, and the temperature is lower than 1620 DEG C.; II adding ferrosilicon 7.5-8.5 kg, metal aluminium 3.7-4.3 kg, lime 28-32 kg and fluorite 3.7-4.3 kg in each ton of molten steel in the reduction phase; III hoisting the molten to a ladle furnace after the vacuum treatment, and adding aluminium powder 20-100 kg for adjusting slags; IV during the 20 minutes before the molten steel treatment ends, feeding a titanium wire of 13 mm fait whose titanium content is 68%, and the wire injecting speed is higher than 250 meter/minute; V after feeding the titanium wire, opening a bottom blowing for stirring, and the bottom blowing argon flow is 50-100 NL/min; VI after smelting, when the molten steel temperature is not lower than 1570 DEG C., sampling for analysis. The yielding rate of titanium is increased from 60% to 80% according to the invention, thereby improving the purity degree of molten steel.
Description
Technical field
The present invention relates to a kind of method that improves super-purity ferrite stainless steel titanium recovery rate.
Background technology
Super-purity ferrite stainless steel chromium content height (〉=17%), carbon content low (≤0.01%) needs a large amount of oxygen blast when smelting super-purity ferrite stainless steel, can reach the purpose of decarbonization and protecting chromium, but the high recovery rate that can reduce titanium of molten steel oxygen level.The method of existing raising super-purity ferrite stainless steel titanium recovery rate is a large amount of aluminium powders that add on slag surface, its shortcoming be the recovery rate of titanium low be 60%, the smelting cost height can cause the stifled accident in the continuous casting working procedure mouth of a river, rear portion simultaneously.
Summary of the invention
In order to overcome the existing above-mentioned deficiency that improves the method for super-purity ferrite stainless steel titanium recovery rate, the invention provides the method for the high raising super-purity ferrite stainless steel titanium recovery rate of a kind of titanium recovery rate.
Technical scheme and design are by the control process blowing oxygen quantity, reduce the whole oxygen level of molten steel, and reduce molten steel oxidation by aluminium, and reach the purpose that improves the titanium recovery rate by the accurate control of ladle furnace.
The method of this raising super-purity ferrite stainless steel titanium recovery rate comprises following sequential steps: the molten steel behind the converter smelting is carried out the oxygen decarburization operation in vacuum refining furnace, per kilogram carbon blowing oxygen quantity is less than 2.2 m
3Pour mass percent Cr 〉=17% of chromium in the molten steel of vacuum refining furnace into by converter; Liquid steel temperature is not less than 1620 ℃; Ladle furnace adds the aluminium powder residue adjustment; The molten steel processing finishes to feed titanium wire in preceding 20 minutes, and wire-feeding velocity is greater than 250 meters/minute; Open bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min～100NL/min.
Say that in detail the method for this raising super-purity ferrite stainless steel titanium recovery rate comprises following sequential steps:
IMolten steel behind the converter smelting is carried out the oxygen decarburization operation in vacuum refining furnace, per kilogram carbon blowing oxygen quantity is less than 2.2 m
3
The mass percent of being poured into the composition in the molten steel of vacuum refining furnace by converter is:
C：0.36～40%； Si：0.02～0.2%； Mn：0.06～0.10%； P≤0.018%；S ≤0.014； Cr 17～22%； N 0.010～0.016%； Mo ≤2.2% ；
All the other are and the iron unavoidable impurities.
Temperature is not less than 1620 ℃.
IIReduction phase molten steel per ton adds ferrosilicon (silicone content 75%, all the other are silicon) 7.5-8.5 kg, metallic aluminium 3.7-4.3 kg, lime 28-32 kg, fluorite 3.7-4.3 kg;
IIIVacuum-treat winches to ladle furnace after finishing, and (90t ladle, 78-80.5t molten steel) (according to the slag condition) adds the residue adjustment of 20-100kg aluminium powder;
IVThe molten steel processing finishes in preceding 20 minutes, feeding titanium content 68% ￠ 13mm titanium wire, and 5～9.2 meters on molten steel per ton, wire-feeding velocity is greater than 250 meters/minute;
VOpen bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min～100NL/min;
VISmelt and finish
,Liquid steel temperature is not less than 1570 ℃, sampling analysis.
The method of above-mentioned raising super-purity ferrite stainless steel titanium recovery rate, it is characterized in that: behind the sampling analysis, the recovery rate of titanium is not less than 80%.
Beneficial effect
Present method can be increased to the recovery rate of titanium and be not less than 80% by 60%, reduce the super-purity ferrite stainless steel production cost, improves the molten steel purity.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with enforcement and embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The steel grade that this enforcement is smelted is 443, uses the 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
The vacuum refining furnace starting condition is: 1623 ℃ of temperature, ladle freeboard are the top of the slag to the vertical range of ladle upper edge is 1350mm, and thickness of slag layer is 30mm, and molten steel weight is 78.5t.
The molten steel composition that vacuum refining furnace arrives at a station is:
C：0.38%； Si：0.05%； Mn：0.08%； P 0.017%；S 0.008%； Cr 20.8%； N 0.0134%；
All the other are and the iron unavoidable impurities.
The method that present embodiment improves the titanium recovery rate is as follows:
IIn vacuum refining furnace, carry out the oxygen decarburization operation, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 2.0 m
3
IIReduction phase molten steel per ton adds ferrosilicon 8 kg, metallic aluminium 4kg, lime 30kg, fluorite 4kg;
IIIVacuum-treat winches to ladle furnace after finishing, and adds the residue adjustment of 20kg aluminium powder;
IVThe molten steel processing finishes to feed in preceding 20 minutes 720 meters of titanium content 68% ￠ 13mm titanium wires, 260 meters/minute of wire-feeding velocities;
VOpen bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min.
VI1580 ℃ of molten steel end temps, the sampling composition is as follows:
C：0.005%； Si：0.28%； Mn：0.10%； P 0.017%；S 0.002%； Cr 20.93%； Ti 0.2158% N 0.0118%；
All the other are and the iron unavoidable impurities.
Titanium recovery rate 81.2%.
Continuous casting becomes continuously cast bloom.
Embodiment two
The steel grade that this enforcement is smelted is 00Cr7Mo, uses the 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
The vacuum refining furnace starting condition is: 1632 ℃ of temperature, ladle freeboard are the top of the slag to the vertical range of ladle upper edge is 1370mm, and thickness of slag layer is 30mm, and molten steel weight is 78.2t.
The molten steel composition that converter is arrived at a station is:
C：0.37%； Si：0.03%； Mn：0.09%； P 0.016%； S 0.012%；
Cr 17.44%； Mo 0.99%； N 0.015%；
All the other are and the iron unavoidable impurities.
The method that present embodiment improves the titanium recovery rate is as follows:
IIn vacuum refining furnace, carry out the oxygen decarburization operation, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 1.9 m
3
IIReduction phase molten steel per ton adds ferrosilicon 8 kg, aluminium alloy 4kg, lime 30kg, fluorite 4kg;
IIIVacuum-treat winches to ladle furnace after finishing, and adds the residue adjustment of 80kg aluminium powder;
IVThe molten steel processing finishes to feed in preceding 20 minutes 501 meters of titanium content 68% ￠ 13mm titanium wires, 260 meters/minute of wire-feeding velocities;
VOpen bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min.
VI1578 ℃ of molten steel end temps, the sampling composition is as follows:
C：0.005%； Si：0.29%； Mn：0.10%； P 0.017%；S 0.002%； Cr 17.51%； Ti 0.14% Mo 1.02% ； N 0.0116%；
All the other are and the iron unavoidable impurities.
Titanium recovery rate 83.3%.
Continuous casting becomes continuously cast bloom.
Embodiment three
The steel grade that this enforcement is smelted is 00Cr18Mo2, uses the 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
The converter starting condition is: 1628 ℃ of temperature, ladle freeboard are the top of the slag to the vertical range of ladle upper edge is 1320mm, and thickness of slag layer is 30mm, and molten steel weight is 80.1t.
The molten steel composition that converter is arrived at a station is:
C：0.39%； Si：0.10%； Mn：0.07%； P 0.013%； S 0.009%；
Cr 17.76%； Mo 2.02%； N 0.013%；
All the other are and the iron unavoidable impurities.
The method that present embodiment improves the titanium recovery rate is as follows:
IIn vacuum refining furnace, carry out the oxygen decarburization operation, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 1.9 m
3
IIReduction phase molten steel per ton adds ferrosilicon 8 kg, aluminium alloy 4kg, lime 30kg, fluorite 4kg;
IIIVacuum-treat winches to ladle furnace after finishing, and adds the residue adjustment of 60kg aluminium powder;
IVThe molten steel processing finishes to feed in preceding 20 minutes 500 meters of titanium content 68% ￠ 13mm titanium wires, 260 meters/minute of wire-feeding velocities;
VOpen bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min.
VI1578 ℃ of molten steel end temps, the sampling composition is as follows:
C：0.004%； Si：0.29%； Mn：0.07%； P 0.013%；S 0.003%； Cr 17.79%； Ti 0.15% Mo 2.02% ； N 0.0112%；
All the other are and the iron unavoidable impurities.
Titanium recovery rate 85.1%.
Continuous casting becomes continuously cast bloom.
Claims (3)
1. method that improves super-purity ferrite stainless steel titanium recovery rate, it comprises following sequential steps: the molten steel behind the converter smelting is carried out the oxygen decarburization operation in vacuum refining furnace, per kilogram carbon blowing oxygen quantity is less than 2.2 m
3Pour mass percent Cr 〉=17% of chromium in the molten steel of vacuum refining furnace into by converter; Liquid steel temperature is not less than 1620 ℃; Ladle furnace adds the aluminium powder residue adjustment; The molten steel processing finishes to feed titanium wire in preceding 20 minutes, and wire-feeding velocity is greater than 250 meters/minute; Open bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min～100NL/min.
2. the method for raising super-purity ferrite stainless steel titanium recovery rate according to claim 1, its steps characteristic is:
IMolten steel behind the converter smelting is carried out the oxygen decarburization operation in vacuum refining furnace, per kilogram carbon blowing oxygen quantity is less than 2.2 m
3
The mass percent of being poured into the composition in the molten steel of vacuum refining furnace by converter is:
C：0.36～40%； Si：0.02～0.2%； Mn：0.06～0.10%； P≤0.018%；S ≤0.014； Cr 17～22%； N 0.010～0.016%； Mo ≤2.2% ；
All the other are and the iron unavoidable impurities; Temperature is not less than 1620 ℃;
IIReduction phase molten steel per ton adds ferrosilicon 7.5-8.5 kg, metallic aluminium 3.7-4.3 kg, lime 28-32 kg, fluorite 3.7-4.3 kg;
IIIVacuum-treat winches to ladle furnace after finishing, and adds the residue adjustment of 20-100kg aluminium powder;
IVThe molten steel processing finishes in preceding 20 minutes, feeding titanium content 68% ￠ 13mm titanium wire, and 5～9.2 meters on molten steel per ton, wire-feeding velocity is greater than 250 meters/minute;
VOpen bottom blowing behind the feeding titanium wire and stir BOTTOM ARGON BLOWING flow 50NL/min～100NL/min;
VISmelt and finish
,Liquid steel temperature is not less than 1570 ℃, sampling analysis.
3. the method for raising super-purity ferrite stainless steel titanium recovery rate according to claim 1 and 2 is characterized in that: behind the sampling analysis, the recovery rate of titanium is not less than 80%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924036A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
| CN103924146A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
| CN104164606A (en) * | 2014-08-08 | 2014-11-26 | 东北大学 | Method for smelting iron-chromium-aluminum alloy and adding aluminum |
Citations (2)
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|---|---|---|---|---|
| JPH0456719A (en) * | 1990-06-25 | 1992-02-24 | Sumitomo Metal Ind Ltd | Vacuum degassing refining method |
| CN102329920A (en) * | 2011-10-25 | 2012-01-25 | 宝山钢铁股份有限公司 | Method for smelting high-aluminum low-silicon ultra pure ferritic stainless steel |
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2013
- 2013-04-25 CN CN201310144830.7A patent/CN103225034B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0456719A (en) * | 1990-06-25 | 1992-02-24 | Sumitomo Metal Ind Ltd | Vacuum degassing refining method |
| CN102329920A (en) * | 2011-10-25 | 2012-01-25 | 宝山钢铁股份有限公司 | Method for smelting high-aluminum low-silicon ultra pure ferritic stainless steel |
Non-Patent Citations (1)
| Title |
|---|
| 范新智等: ""提高00Cr12Ti铁素体不锈钢钛回收率的工艺实践"", 《特殊钢》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924036A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
| CN103924146A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
| CN103924036B (en) * | 2014-04-08 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Titaniferous cored-wire and application thereof and Ti Alloying molten steel and preparation method thereof and a kind of titaniferous steel alloy |
| CN104164606A (en) * | 2014-08-08 | 2014-11-26 | 东北大学 | Method for smelting iron-chromium-aluminum alloy and adding aluminum |
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