CN101353713A - Use and use method of sulfur alloy or sulfur concentrate - Google Patents
Use and use method of sulfur alloy or sulfur concentrate Download PDFInfo
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- CN101353713A CN101353713A CNA2007100441451A CN200710044145A CN101353713A CN 101353713 A CN101353713 A CN 101353713A CN A2007100441451 A CNA2007100441451 A CN A2007100441451A CN 200710044145 A CN200710044145 A CN 200710044145A CN 101353713 A CN101353713 A CN 101353713A
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Abstract
The invention discloses the usage of sulfur alloy or sulfur ore concentrate, and an application method thereof, which is mainly characterized in that the sulfur alloy or the sulfur ore concentrate are wrapped by thin sheet iron to make a cored wire which is taken as a resulfurization agent used for steel production. The application method of the sulfur alloy or the sulfur ore concentrate comprises the steps: the cored wire is injected into liquid steel by a wire injection machine, bottom blowing argon is firstly increased at an instant to cause molten steel to expose out of the slagging level and then reduced to the minimum immediately, the flow rate of the argon maintains the whole resulfurization process; the injection speed is more than or equal to 2.0m/s; the sulfur ore cored wire is injected according to the recovery rate of more than 90 percent, stirring is stopped immediately after the wire injection is finished, and pouring is carried out within 5 minutes. The invention cause sulfur content in the liquid steel to be easier to control, and can reduce the production cost and improve the product quality under the condition of further purifying the molten steel.
Description
Technical field
The present invention relates to field of metallurgy and increase the sulphur agent, particularly the purposes and the using method of sulphur alloy or sulphur concentrate.
Background technology
According to the purposes characteristic of steel, need certain sulphur content in some steel.Tradition STEELMAKING PRODUCTION method is in steelmaking process, by sacrificing the superperformance of pureization of the strong deoxidation of high basicity refining slag, the artificial refining slag that makes worsens, increase the sulphur performance preferably to obtain, add the sulphur alloy then in slag, the sulphur performance that increases by the refining slag that worsens this moment increases sulphur content in the molten steel, and oxygen level height, the inclusion of the steel that this kind method is produced are many, have a strong impact on the purity of steel, but can guarantee the stable of sulphur content in the steel.
Summary of the invention
The purpose of this invention is to provide a kind of purposes and using method of making steel with sulphur alloy or sulphur concentrate, make the finished steel oxygen level low, be mingled with few, thereby reduce production costs pure molten steel.
The present invention realizes that the technical scheme of above-mentioned purpose is: the purposes of a kind of sulphur alloy or sulphur concentrate, sulphur alloy or sulphur concentrate comprise the chemical element of following weight percent proportioning: S:45～50%, C≤0.5%, P≤0.10%, Si≤2.0%, Mn≤0.30%, surplus is Fe and unavoidable impurities, is used for steel-making with increasing the sulphur agent.
The using method of described sulphur alloy or sulphur concentrate comprises following steps:
(1) increase sulphur before, control refining slag composition CaO:45～58%, SiO
2: 8～15%, Al
2O
3: 18%～26%, CaF
2: 3～7%, MgO:3～10%.
(2) earlier with the argon bottom-blowing moment increase of ladle, make molten steel expose the top of the slag, immediately be decreased to minimum, but do not close, this argon flow amount is kept the whole sulphur process that increases.Line feeding process argon bottom-blowing must be by last control, and as not opening big argon gas earlier, then the sulphur line easily is added on the top of the slag, and recovery rate is low and unstable.In the process of line feeding, excessive as argon gas, then the refining slag of high basicity absorbs sulphur, the easier sulphur instability that causes; Close as argon gas, it is inhomogeneous sulphur then to occur.
Cored-wire, feeding speed 〉=2.0m/s; Wire-feeding velocity must be fast, as do not reach the minimum velocity of this regulation, easily cause the interior sulphur of ladle inhomogeneous, and the recovery rate of sulphur is low.
(4) by the feeding of the rate of recovery more than 90% sulphur concentrate cored-wire, line feeding is closed stirring after finishing immediately, and pours into a mould in 5min.Line feeding is finished and must be closed stirring immediately, and as not according to this control, the sulphur composition is difficult to control, in like manner, can not pour into a mould in 5min, also is prone to the sulphur fluctuation, causes uncontrollable.
Preferably, when showing out cut, turns the refining slag that covers the molten steel face flow of argon gas down.
The present invention compared with prior art has following beneficial effect:
1. add FeS alloy method with tradition and compare the inventive method low production cost.In molten steel, under the situation of the sulphur of same amount, use the inventive method can descend cost more than 50%.
2. use the inventive method makes the easier easy control of sulphur content.The finished product sulphur content can be controlled in 0.95～1.05 scope of target value.
3. molten steel is purer.Oxygen level can drop to below the 15ppm, and the inclusion category-B is mingled with≤and 1.5 grades, the C class is mingled with 0 grade, reaches the level of Clean Steel.
4. the inventive method technology is simple, and is workable.
Embodiment
Embodiment 1:
Employing sheet iron parcel sulphur concentrate (contain S:48%, C:0.3%, P:0.10%, Si:0.8%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.040%～0.065%), ladle furnace is controlled refining slag composition CaO:55.1%, SiO to produce certain steel grade
2: 9.4%, Al
2O
3: 24%, CaF
2: 6.9%, MgO:4.6%.Deoxidation is to 2.3ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.013% in the molten steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 5 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 0.6 kilogram of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.050%, line feeding promptly should be closed stirring after finishing, and opens in 3min and water cast.Finished product sulphur content 0.060%, the rate of recovery reaches 94%.
This stove steel finished product oxygen level 12ppm, inclusion rank A:2.0, B:1.0, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=25ppm, and inclusion rank A 〉=3.0, B 〉=2.0, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
Embodiment 2
Employing sheet iron parcel sulphur concentrate (contain S:48%, C:0.3%, P:0.10%, Si:0.8%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.020%～0.045%), ladle furnace is controlled refining slag composition CaO:53%, SiO to produce certain steel grade
2: 11.5%, Al
2O
3: 21%, CaF
2: 5.3%, MgO:9.2%.Deoxidation is to 1.5ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity refining slag, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.007% in the steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 4 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 0.5 kilogram of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.020%, line feeding promptly should be closed stirring after finishing, and opens in 3min and water cast.Finished product sulphur content 0.025%, the rate of recovery reaches 90%.
This stove steel finished product oxygen level 10ppm, inclusion rank A:1.5, B:1.5, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=20ppm, and inclusion rank A 〉=2.0, B 〉=2.5, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
Embodiment 3
Employing sheet iron parcel sulphur concentrate (contain S:45%, C:0.2%, P:0.10%, Si:1.2%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.045%～0.065%), ladle furnace is controlled refining slag composition CaO:45.9%, SiO to produce certain steel grade
2: 13.8%, Al
2O
3: 25.3%, CaF
2: 6.3%, MgO:8.7%.Deoxidation is to 3.8ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity refining slag, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.018% in the steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 5 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 0.5 kilogram of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.040%, line feeding promptly should be closed stirring after finishing, and opens in 5min and water cast.Finished product sulphur content 0.055%, the rate of recovery reaches 92.5%.
This stove steel finished product oxygen level 14ppm, inclusion rank A:1.5, B:2.0, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=25ppm, and inclusion rank A 〉=2.5, B 〉=2.5, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
Embodiment 4
Employing sheet iron parcel sulphur concentrate (contain S:45%, C:0.2%, P:0.10%, Si:1.2%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.020%～0.035%), ladle furnace is controlled refining slag composition CaO:57.4%, SiO to produce certain steel grade
2: 9.1%, Al
2O
3: 19%, CaF
2: 6.7%, MgO:7.8%.Deoxidation is to 0.7ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity refining slag, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.004% in the steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 6 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 1.0 kilograms of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.025%, line feeding promptly should be closed stirring after finishing, and opens in 3min and water cast.Finished product sulphur content 0.027%, the rate of recovery reaches 92%.
This stove steel finished product oxygen level 8ppm, inclusion rank A:1.0, B:1.0, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=15ppm, and inclusion rank A 〉=2.0, B 〉=2.0, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
Embodiment 5
Employing sheet iron parcel sulphur concentrate (contain S:50%, C:0.4%, P:0.10%, Si:0.8%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.020%～0.035%), ladle furnace is controlled refining slag composition CaO:53.2%, SiO to produce certain steel grade
2: 12.4%, Al
2O
3: 25.1%, CaF
2: 3.2%, MgO:6.1%.Deoxidation is to 1.4ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity refining slag, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.008% in the steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 5 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 1.0 kilograms of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.020%, line feeding promptly should be closed stirring after finishing, and opens in 4min and water cast.Finished product sulphur content 0.026%, the rate of recovery reaches 90%.
This stove steel finished product oxygen level 9ppm, inclusion rank A:1.0, B:1.5, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=15ppm, and inclusion rank A 〉=2.0, B 〉=2.0, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
Embodiment 6
Employing sheet iron parcel sulphur concentrate (contain S:50%, C:0.4%, P:0.10%, Si:0.8%, Mn:0.10%, surplus is Fe) cored-wire.
(the sulphur content standard: 0.080%～0.120%), ladle furnace is controlled refining slag composition CaO:46.1%, SiO to produce certain steel grade
2: 14.2%, Al
2O
3: 25.7%, CaF
2: 6.2%, MgO:7.8%.Deoxidation is to 4.2ppm, and realization Clean Steel level is controlled and realized that also outer other elements of sulphur removal all reach standard, because high basicity refining slag, the sulphur composition should not be controlled, and can not satisfy standard-required, and sulphur content is 0.021% in the steel at this moment.
Enter and increase sulphur technology.Control ladle bottom blowing argon gas 4 kilograms of pressure make molten steel expose the top of the slag, after be decreased to 1.0 kilograms of pressure immediately; Increase sulphur with feeding wire machine with the 2m/s wire-feeding velocity, increase sulfur content 0.090%, line feeding promptly should be closed stirring after finishing, and opens in 3min and water cast.Finished product sulphur content 0.104%, the rate of recovery reaches 92%.
This stove steel finished product oxygen level 15ppm, inclusion rank A:2.0, B:1.5, C:0, D:0.5 reach the Clean Steel level.Before this, this steel grade adopts traditional technology, finished product oxygen level 〉=30ppm, and inclusion rank A 〉=4.0, B 〉=3.0, C 〉=0.5, D 〉=0.5 can not reach the Clean Steel level.
The present invention is not limited to above-mentioned embodiment, can also adopt the sulphur alloy to replace the sulphur concentrate to make steel-making with increasing the sulphur agent.
Claims (3)
1. the purposes of sulphur alloy or sulphur concentrate, sulphur alloy or sulphur concentrate comprise the chemical element of following weight percent proportioning: S:45～50%, C≤0.5%, P≤0.10%, Si≤2.0%, Mn≤0.30%, surplus is Fe and unavoidable impurities, it is characterized in that as steel-making with increasing the sulphur agent.
2. the using method of sulphur alloy or sulphur concentrate, sulphur alloy or sulphur concentrate comprise the chemical element of following weight percent proportioning: S:45～50%, C≤0.5%, P≤0.10%, Si≤2.0%, Mn≤0.30%, surplus is Fe and unavoidable impurities, it is characterized in that: comprise following steps:
(1) increase sulphur before, control refining slag composition CaO:45～58%, SiO
2: 8～15%, Al
2O
3: 18%～26%, CaF
2: 3～7%, MgO:3～10%;
(2) earlier with the argon bottom-blowing moment increase of ladle, make molten steel expose the top of the slag, immediately be decreased to minimum, but do not close, this argon flow amount is kept the whole sulphur process that increases;
(3) toward slag cut feeding sulphur alloy or sulphur concentrate cored-wire, feeding speed 〉=2.0m/s;
(4) by feeding sulphur alloy of the rate of recovery more than 90% or sulphur concentrate cored-wire, line feeding is closed stirring after finishing immediately, and pours into a mould in 5min.
3. the using method of sulphur alloy as claimed in claim 2 or sulphur concentrate is characterized in that: the flow that reduces argon gas when the refining slag that covers the molten steel face is showed out cut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100441451A CN101353713A (en) | 2007-07-24 | 2007-07-24 | Use and use method of sulfur alloy or sulfur concentrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100441451A CN101353713A (en) | 2007-07-24 | 2007-07-24 | Use and use method of sulfur alloy or sulfur concentrate |
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| Publication Number | Publication Date |
|---|---|
| CN101353713A true CN101353713A (en) | 2009-01-28 |
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|---|---|---|---|
| CNA2007100441451A Pending CN101353713A (en) | 2007-07-24 | 2007-07-24 | Use and use method of sulfur alloy or sulfur concentrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107321944A (en) * | 2017-07-13 | 2017-11-07 | 马鞍山钢铁股份有限公司 | A kind of sulfur-bearing Aluminum steel increases sulphur method |
-
2007
- 2007-07-24 CN CNA2007100441451A patent/CN101353713A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107321944A (en) * | 2017-07-13 | 2017-11-07 | 马鞍山钢铁股份有限公司 | A kind of sulfur-bearing Aluminum steel increases sulphur method |
| CN107321944B (en) * | 2017-07-13 | 2019-07-30 | 马鞍山钢铁股份有限公司 | A kind of sulfur-bearing Aluminum steel increasing sulphur method |
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Open date: 20090128 |