CN106544469A - The method for reducing the D type impurities in steel-making - Google Patents
The method for reducing the D type impurities in steel-making Download PDFInfo
- Publication number
- CN106544469A CN106544469A CN201611050136.9A CN201611050136A CN106544469A CN 106544469 A CN106544469 A CN 106544469A CN 201611050136 A CN201611050136 A CN 201611050136A CN 106544469 A CN106544469 A CN 106544469A
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- CN
- China
- Prior art keywords
- steel
- type impurities
- equal
- impurities during
- soft blow
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The present invention discloses the method for reducing the D type impurities in steel-making, and the method includes：Raw material is sequentially passed through blowing and wash heat by step 1, is sent afterwards and is fed aluminum steel, obtains A；A is carried out deoxidation and desulfurization, and makes moderate alkalinity refining slag according to molten steel sulfur content carrying out white slag refine, obtains B by step 2；Step 3, B is inserted in vacuum chamber, and is injected.The method of the D type impurities in reduction steel-making overcomes D classes of the prior art and is mingled with for the exceeded problem of spherical oxide, realizes D classes and is mingled with the effective control for spherical oxide.
Description
Technical field
The present invention relates to the method for the D type impurities in reducing making steel.
Background technology
The critical function of external refining carry out under conditions of being included in vacuum, inert atmosphere or controlled atmosphere deoxidation, desulfurization,
Removal of inclusions and inclusion modification.The easy segregation of big cross section continuous casting billet is cracked, and Cleanliness of Molten Steel is required higher.D classes are pressed from both sides
Debris are exceeded, have a strong impact on slab quality.
The source of steel grade non-metallic inclusion is two classes：Interior raw non-metallic inclusion and exogenous non-metallic inclusion, at calcium
In reason aluminum killed steel continuous casting billet, common endogenous inclusion is calcium aluminate, foreign impurity be mainly secondary oxidation of steel product,
Resistance to material erosion etc..
D classes are mingled with for spherical oxide, and Cause Analysis on Excess is mainly：1 is relevant with deoxidization technique and secondary oxidation；2 is resistance to
Fiery material, slag are mixed into molten steel and fully do not float and be detained.
The content of the invention
It is an object of the invention to provide a kind of method for reducing the D type impurities in steel-making, the D classes folder in the reduction steel-making
The method of debris overcomes D classes of the prior art and is mingled with for the exceeded problem of spherical oxide, realizes D classes and is mingled with for spherical
The effective control of oxide.
To achieve these goals, the invention provides a kind of method for reducing the D type impurities in steel-making, the method bag
Include：
Raw material is sequentially passed through blowing and wash heat by step 1, is sent afterwards and is fed aluminum steel, obtains A；
A is carried out deoxidation and desulfurization, and makes moderate alkalinity refining slag according to molten steel sulfur content carrying out white slag refine by step 2,
Obtain B；
Step 3, B is inserted in vacuum chamber, and is injected.
Preferably, in step 2, making moderate alkalinity refining slag according to molten steel sulfur content carries out white slag refine, and white slag keeps
Time is more than or equal to 20min.
Preferably, in step 2, making moderate alkalinity refining slag according to molten steel sulfur content carries out white slag refine, and white slag keeps
Time is more than or equal to 40min.
Preferably, in step 3, B is inserted in vacuum chamber, the retention time is more than or equal to 10min.
Preferably, in step 3, B is inserted in vacuum chamber, the retention time is more than or equal to 20min
Preferably, in step 3, injecting carries out soft blow in calcium line, kept for the soft blow time be more than or equal to 15min.
Preferably, in step 3, injecting carries out soft blow in calcium line, kept for the soft blow time be more than or equal to 25min.
Preferably, in step 3, injecting carries out soft blow in calcium line, kept for the soft blow time be more than or equal to 35min.
By above-mentioned embodiment, the present invention makes full use of external refining skill in the case where additionally cost is not increased
Art so that D type impurities are effectively controlled in big cross section continuous casting billet, D type impurities are graded at 0～0.5 grade, improve product
Quality, the production for big cross section continuous casting billet provide technical support, have broad application prospects.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow chart of the method for the D type impurities in a kind of reduction steel-making for illustrate the present invention.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
The present invention provides a kind of method for reducing the D type impurities in steel-making, and the method includes：
Raw material is sequentially passed through blowing and wash heat by step 1, is sent afterwards and is fed aluminum steel, obtains A；
A is carried out deoxidation and desulfurization, and makes moderate alkalinity refining slag according to molten steel sulfur content carrying out white slag refine by step 2,
Obtain B；
Step 3, B is inserted in vacuum chamber, and is injected.
By above-mentioned embodiment, the present invention makes full use of external refining skill in the case where additionally cost is not increased
Art so that D type impurities are effectively controlled in big cross section continuous casting billet, D type impurities are graded at 0～0.5 grade, improve product
Quality, the production for big cross section continuous casting billet provide technical support, have broad application prospects.
In the present invention, converter tapping process is with aluminium ingot deoxidation and carries out wash heat, and furnace rear feeds aluminum steel, enters after LF refining no longer
Aluminum is mended, Cleanliness of Molten Steel is improved.
In a kind of specific embodiment of the present invention, in step 2, moderate alkalinity refining slag is made according to molten steel sulfur content
White slag refine is carried out, the white slag retention time is more than or equal to 20min.
By above-mentioned embodiment, white slag refine can be carried out as far as possible, and causes the effect of white slag refine more
It is good.
In a kind of specific embodiment of the present invention, in step 2, moderate alkalinity refining slag is made according to molten steel sulfur content
White slag refine is carried out, the white slag retention time is more than or equal to 40min.
By above-mentioned embodiment, the retention time is longer, and effect is better.
The present invention a kind of specific embodiment in, in step 3, B is inserted in vacuum chamber, the retention time more than etc.
In 10min.
In this kind of preferred implementation, in step 3, B is inserted in vacuum chamber, the retention time is more than or equal to 20min
In this kind of embodiment, in step 3, injecting carries out soft blow in calcium line, kept for the soft blow time be more than or equal to
15min。
In a kind of specific embodiment of the present invention, in step 3, soft blow is carried out in injection calcium line, when keeping soft blow
Between be more than or equal to 25min.
In a kind of specific embodiment of the present invention, in step 3, soft blow is carried out in injection calcium line, when keeping soft blow
Between be more than or equal to 35min.
The present invention can improve Cleanliness of Molten Steel, the technological design of removal of inclusions：Modified technique method, using the outer essence of stove
Refining technology, D type impurities in effective control big cross section continuous casting billet improve continuous casting billet quality.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, various letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The compound mode of energy is no longer separately illustrated.
Additionally, combination in any between a variety of embodiments of the present invention, can also be carried out, as long as which is without prejudice to this
The thought of invention, which should equally be considered as content disclosed in this invention.
Claims (8)
1. the method for the D type impurities during a kind of reduction is made steel, it is characterised in that the method includes：
Raw material is sequentially passed through blowing and wash heat by step 1, is sent afterwards and is fed aluminum steel, obtains A；
A is carried out deoxidation and desulfurization, and makes moderate alkalinity refining slag according to molten steel sulfur content carrying out white slag refine, obtains by step 2
B；
Step 3, B is inserted in vacuum chamber, and is injected.
2. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 2, root
Moderate alkalinity refining slag is made according to molten steel sulfur content carries out white slag refine, and the white slag retention time is more than or equal to 20min.
3. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 2, root
Moderate alkalinity refining slag is made according to molten steel sulfur content carries out white slag refine, and the white slag retention time is more than or equal to 40min.
4. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 3, by B
Insert in vacuum chamber, the retention time is more than or equal to 10min.
5. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 3, by B
Insert in vacuum chamber, the retention time is more than or equal to 20min.
6. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 3, note
Soft blow is carried out in entering calcium line, is kept for the soft blow time be more than or equal to 15min.
7. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 3, note
Soft blow is carried out in entering calcium line, is kept for the soft blow time be more than or equal to 25min.
8. the method for the D type impurities during reduction according to claim 1 is made steel, it is characterised in that in step 3, note
Soft blow is carried out in entering calcium line, is kept for the soft blow time be more than or equal to 35min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050136.9A CN106544469A (en) | 2016-11-25 | 2016-11-25 | The method for reducing the D type impurities in steel-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050136.9A CN106544469A (en) | 2016-11-25 | 2016-11-25 | The method for reducing the D type impurities in steel-making |
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| Publication Number | Publication Date |
|---|---|
| CN106544469A true CN106544469A (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611050136.9A Pending CN106544469A (en) | 2016-11-25 | 2016-11-25 | The method for reducing the D type impurities in steel-making |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597666A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that is used to improve plate of moderate thickness carbon aluminium-killed steel molten steel cleanness |
| CN102260768A (en) * | 2011-08-01 | 2011-11-30 | 南京钢铁股份有限公司 | Static mixing method for steelmaking molten steel |
| CN104451417A (en) * | 2014-12-31 | 2015-03-25 | 广东韶钢松山股份有限公司 | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate |
| CN105132631A (en) * | 2015-08-28 | 2015-12-09 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling Ds type inclusions in heavy-rail steel |
-
2016
- 2016-11-25 CN CN201611050136.9A patent/CN106544469A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597666A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that is used to improve plate of moderate thickness carbon aluminium-killed steel molten steel cleanness |
| CN102260768A (en) * | 2011-08-01 | 2011-11-30 | 南京钢铁股份有限公司 | Static mixing method for steelmaking molten steel |
| CN104451417A (en) * | 2014-12-31 | 2015-03-25 | 广东韶钢松山股份有限公司 | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate |
| CN105132631A (en) * | 2015-08-28 | 2015-12-09 | 河北钢铁股份有限公司邯郸分公司 | Method for controlling Ds type inclusions in heavy-rail steel |
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Application publication date: 20170329 |