CN103225034B - 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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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 improving super-purity ferrite stainless steel titanium recovery rate.
Background technology
Super-purity ferrite stainless steel chromium content high (>=17%), carbon content low (≤0.01%), needs a large amount of oxygen blast when smelting super-purity ferrite stainless steel, can reach the object of decarbonization and protecting chromium, but the high recovery rate that can reduce titanium of Oxygen Content in Liquid Steel.The method of existing raising super-purity ferrite stainless steel titanium recovery rate adds aluminium powder in a large number on slag surface, its shortcoming be the recovery rate of titanium low be 60%, smelting cost is high, can cause the accident that the continuous casting working procedure mouth of a river, rear portion is stifled simultaneously.
Summary of the invention
In order to overcome the existing above-mentioned deficiency improving 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 control process blowing oxygen quantity, reduce the Whole Oxygen content of molten steel, and reduce molten steel oxidation by aluminium, and are reached the object improving 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 step successively: the molten steel after converter smelting is carried out oxygen decarburization operation in vacuum refining furnace, and per kilogram carbon blowing oxygen quantity is less than 2.2 m
3; Poured into mass percent Cr>=17% of chromium in the molten steel of vacuum refining furnace by converter; Liquid steel temperature is not less than 1620 DEG C; Ladle furnace adds aluminium powder residue adjustment; Steel treatment terminates to feed titanium wire in first 20 minutes, and wire-feeding velocity is greater than 250 ms/min; Bottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min ~ 100NL/min after feeding titanium wire.
Say in detail, the method for this raising super-purity ferrite stainless steel titanium recovery rate comprises following step successively:
imolten steel after converter smelting is carried out oxygen decarburization operation in vacuum refining furnace, and per kilogram carbon blowing oxygen quantity is less than 2.2 m
3;
The mass percent 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 inevitable impurity of iron.
Temperature is not less than 1620 DEG C.
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;
iIIwinch to ladle furnace after vacuum-treat terminates, (90t ladle, 78-80.5t molten steel) (according to slag condition) adds the residue adjustment of 20-100kg aluminium powder;
iVsteel treatment terminates in first 20 minutes, feeding titanium content 68% ￠ 13mm titanium wire, 5 ~ 9.2 meters, molten steel per ton, and wire-feeding velocity is greater than 250 ms/min;
vbottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min ~ 100NL/min after feeding titanium wire;
vIsmelt and terminate
,liquid steel temperature is not less than 1570 DEG C, sampling analysis.
The method of above-mentioned raising super-purity ferrite stainless steel titanium recovery rate, it is characterized in that: after sampling analysis, the recovery rate of titanium is not less than 80%.
Beneficial effect
The recovery rate of titanium can be increased to by 60% and be not less than 80% by present method, reduces super-purity ferrite stainless steel production cost, improves Molten Steel Cleanliness.
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 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
Vacuum refining furnace starting condition is: temperature 1623 DEG C, and on ladle freeboard and the top of the slag to ladle, the vertical range on edge is 1350mm, and thickness of slag layer is 30mm, and Metal 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 inevitable impurity of iron.
The method that the present embodiment improves titanium recovery rate is as follows:
ioxygen decarburization operation is carried out, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 2.0 m in vacuum refining furnace
3;
iIreduction phase molten steel per ton adds ferrosilicon 8 kg, metallic aluminium 4kg, lime 30kg, fluorite 4kg;
iIIwinch to ladle furnace after vacuum-treat terminates, add the residue adjustment of 20kg aluminium powder;
iVsteel treatment terminates to feed titanium content 68% ￠ 13mm titanium wire 720 meters in first 20 minutes, wire-feeding velocity 260 ms/min;
vbottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min after feeding titanium wire.
vImolten steel end temp 1580 DEG C, 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 inevitable impurity of iron.
Titanium recovery rate 81.2%.
Continuous casting becomes continuously cast bloom.
embodiment two
The steel grade that this enforcement is smelted is 00Cr7Mo, uses 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
Vacuum refining furnace starting condition is: temperature 1632 DEG C, and on ladle freeboard and the top of the slag to ladle, the vertical range on edge is 1370mm, and thickness of slag layer is 30mm, and Metal 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 inevitable impurity of iron.
The method that the present embodiment improves titanium recovery rate is as follows:
ioxygen decarburization operation is carried out, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 1.9 m in vacuum refining furnace
3;
iIreduction phase molten steel per ton adds ferrosilicon 8 kg, aluminium alloy 4kg, lime 30kg, fluorite 4kg;
iIIwinch to ladle furnace after vacuum-treat terminates, add the residue adjustment of 80kg aluminium powder;
iVsteel treatment terminates to feed titanium content 68% ￠ 13mm titanium wire 501 meters in first 20 minutes, wire-feeding velocity 260 ms/min;
vbottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min after feeding titanium wire.
vImolten steel end temp 1578 DEG C, 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 inevitable impurity of iron.
Titanium recovery rate 83.3%.
Continuous casting becomes continuously cast bloom.
embodiment three
The steel grade that this enforcement is smelted is 00Cr18Mo2, uses 90t ladle.
Operational path is converter → vacuum refining furnace → LF → continuous casting.
Converter starting condition is: temperature 1628 DEG C, and on ladle freeboard and the top of the slag to ladle, the vertical range on edge is 1320mm, and thickness of slag layer is 30mm, and Metal 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 inevitable impurity of iron.
The method that the present embodiment improves titanium recovery rate is as follows:
ioxygen decarburization operation is carried out, blowing oxygen quantity per kilogram carbon blowing oxygen quantity 1.9 m in vacuum refining furnace
3;
iIreduction phase molten steel per ton adds ferrosilicon 8 kg, aluminium alloy 4kg, lime 30kg, fluorite 4kg;
iIIwinch to ladle furnace after vacuum-treat terminates, add the residue adjustment of 60kg aluminium powder;
iVsteel treatment terminates to feed titanium content 68% ￠ 13mm titanium wire 500 meters in first 20 minutes, wire-feeding velocity 260 ms/min;
vbottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min after feeding titanium wire.
vImolten steel end temp 1578 DEG C, 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 inevitable impurity of iron.
Titanium recovery rate 85.1%.
Continuous casting becomes continuously cast bloom.
Claims (3)
1. improve a method for super-purity ferrite stainless steel titanium recovery rate, it comprises following step successively: the molten steel after converter smelting is carried out oxygen decarburization operation in vacuum refining furnace, and per kilogram carbon blowing oxygen quantity is less than 2.2 m
3; Poured into mass percent Cr>=17% of chromium in the molten steel of vacuum refining furnace by converter; Liquid steel temperature is not less than 1620 DEG C; Ladle furnace adds aluminium powder residue adjustment; Steel treatment terminates to feed titanium wire in first 20 minutes, and wire-feeding velocity is greater than 250 ms/min; Bottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min ~ 100NL/min after feeding titanium wire.
2. the method for raising super-purity ferrite stainless steel titanium recovery rate according to claim 1, its steps characteristic is:
imolten steel after converter smelting is carried out oxygen decarburization operation in vacuum refining furnace, and per kilogram carbon blowing oxygen quantity is less than 2.2 m
3;
The mass percent 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 inevitable impurity of iron; Temperature is not less than 1620 DEG C;
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;
iIIwinch to ladle furnace after vacuum-treat terminates, add the residue adjustment of 20-100kg aluminium powder;
iVsteel treatment terminates in first 20 minutes, feeding titanium content 68% ￠ 13mm titanium wire, 5 ~ 9.2 meters, molten steel per ton, and wire-feeding velocity is greater than 250 ms/min;
vbottom blowing stirring is opened, BOTTOM ARGON BLOWING flow 50NL/min ~ 100NL/min after feeding titanium wire;
vIsmelt and terminate
,liquid steel temperature is not less than 1570 DEG C, sampling analysis.
3. the method for raising super-purity ferrite stainless steel titanium recovery rate according to claim 1 and 2, it is characterized in that: after sampling analysis, the recovery rate of titanium is not less than 80%.
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| 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 |
| CN103924146B (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 |
| CN104164606B (en) * | 2014-08-08 | 2016-03-30 | 东北大学 | A kind of smelt iron Ohmax adds the method for aluminium |
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| 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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| 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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|---|
| "提高00Cr12Ti铁素体不锈钢钛回收率的工艺实践";范新智等;《特殊钢》;20091231;第30卷(第6期);第32-33页 * |
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