CN107385148A - A kind of control method of high-grade pipe line steel non-metallic inclusion - Google Patents
A kind of control method of high-grade pipe line steel non-metallic inclusion Download PDFInfo
- Publication number
- CN107385148A CN107385148A CN201710500591.2A CN201710500591A CN107385148A CN 107385148 A CN107385148 A CN 107385148A CN 201710500591 A CN201710500591 A CN 201710500591A CN 107385148 A CN107385148 A CN 107385148A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- metallic inclusion
- pipe line
- als
- control method
- Prior art date
- 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.)
- Pending
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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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of control method of high-grade pipe line steel non-metallic inclusion, it is in smelting process, end-deoxidizer is used as using aluminium, carry out Calcium treatment, by regulating and controlling [Cat] in molten steel/[Als] ratios, control molten steel terminal field trash composition is realized, reduces aluminium deviation in molten steel, so as to improve the degree of purity of molten steel.This method realizes the generation of low melting point non-metallic inclusion in molten steel by [Cat] in molten steel/[Als] controls.Regulate and control by calcium aluminum ratio in molten steel, realize the non-metallic inclusion stability contorting of molten steel generation near C12A7, and considerably reduce the deviation of T.Al and Als in molten steel, realize the degree of purity for improving molten steel.
Description
Technical field
The present invention relates to metal smelt technical field, more particularly to a kind of control of high-grade pipe line steel non-metallic inclusion
Method processed.
Background technology
In high-grade pipe line steel production process, the Al of deoxidation generation2O3Field trash hardness is big, fusing point is high, is subsequently rolling
During easily crack, so as to being damaged to product made from steel performance.Generally use Calcium treatment produces the nonmetallic folder of low melting point
The method of debris is to Al2O3Field trash is removed and is modified.Target is generation in 12CaO7Al2O3(C12A7) nearby low
The field trash of fusing point.For the steel grade using aluminium as end-deoxidizer, because of the difference of steel grade class, control generates C12A7 eutectics nearby
Point field trash method it is also different, in different steel grade class molten steel calcium content number directly affect generation field trash type.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of controlling party of high-grade pipe line steel non-metallic inclusion
Method.
The present invention provides a kind of control method of high-grade pipe line steel non-metallic inclusion, and it is in smelting process, with aluminium
As end-deoxidizer, Calcium treatment is carried out, by regulating and controlling [Cat] in molten steel/[Als] ratios, realizes that control molten steel terminal is mingled with
Thing forms, and reduces aluminium deviation in molten steel, so as to improve the degree of purity of molten steel.
Further, the smelting process includes：LF refining-RH refining-CC continuous castings；Or at LF refining-VD vacuum
Reason-CC continuous castings.
Further, Calcium treatment is carried out before or after the station of RH refinings or VD applications of vacuum, or is answered with above-mentioned operation
Close and carry out.
Further, offed normal by regulating and controlling the station of RH refinings or VD applications of vacuum and [Cat] in molten steel during tundish/
[Als] ratio, regulate and control field trash composition and aluminium deviation in molten steel.
Further, during tundish in molten steel [Cat]/[Als] Ratio controls in the range of 0.05-0.08.
The present invention provides a kind of control method of high-grade pipe line steel non-metallic inclusion, and this method passes through in molten steel
[Cat]/[Als] controls the generation for realizing low melting point non-metallic inclusion in molten steel.Regulate and control by calcium aluminum ratio in molten steel, realize
The non-metallic inclusion stability contorting of molten steel generation considerably reduces the inclined of T.Al and Als in molten steel near C12A7
Difference, realize the degree of purity for improving molten steel.
Brief description of the drawings
Fig. 1 is that the middle-and-high-ranking other pipe line steel of the embodiment of the present invention is offed normal and [Cat]/[Als] in molten steel during tundish in RH
And aluminium deviation corresponding relation figure；
Fig. 2 is field trash shape appearance figure in tundish molten steel of the embodiment of the present invention；
Fig. 3 is field trash energy spectrum diagram in tundish molten steel of the embodiment of the present invention.
Embodiment
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Present inventor has found, in the case of stable processing technique, formation of the calcium aluminum ratio to field trash type in molten steel
With decisive role, for high-grade pipe line steel actual production process, control generation C12A7 lower melting point inclusions nearby are provided
Molten steel [Cat]/[Als] compare production it is significant.
Thus, the present invention provides a kind of control method of high-grade pipe line steel non-metallic inclusion, its in smelting process,
Using aluminium as end-deoxidizer, Calcium treatment is carried out, by regulating and controlling [Cat] in molten steel/[Als] ratios, realizes control molten steel terminal
Field trash forms, and reduces aluminium deviation in molten steel, so as to improve the degree of purity of molten steel.
Preferably, the smelting process includes：LF refining-RH refining-CC continuous castings；Or LF refining-VD applications of vacuum-
CC continuous castings.
Preferably, Calcium treatment is carried out before or after the station of RH refinings or VD applications of vacuum, or compound with above-mentioned operation
Carry out.
Preferably, offed normal by regulating and controlling the station of RH refinings or VD applications of vacuum and [Cat] in molten steel during tundish/
[Als] ratio, regulate and control field trash composition and aluminium deviation in molten steel.
Further, during tundish in molten steel [Cat]/[Als] Ratio controls in the range of 0.05-0.08.
The present invention provides a kind of control method of high-grade pipe line steel non-metallic inclusion, and this method passes through in molten steel
[Cat]/[Als] controls the generation for realizing low melting point non-metallic inclusion in molten steel.Regulate and control by calcium aluminum ratio in molten steel, realize
The non-metallic inclusion stability contorting of molten steel generation considerably reduces the inclined of T.Al and Als in molten steel near C12A7
Difference, realize the degree of purity for improving molten steel.
With reference to embodiment, the present invention is expanded on further：
Embodiment
Pipe line steel, according to [Cat], [Als] composition being measured by sampling in multiple pressure in steel, carries out suitably feeding calcium after RH is pressed again
Line processing, [Cat]/[Als] is in the range of 0.06-0.08 in molten steel component when the RH is offed normal, and is made in tundish molten steel
[Cat]/[Als] is in the range of 0.05-0.07, the aluminium deviation in steel is effectively reduced, is seen dashed region in Fig. 1.Can in figure
To find out in tundish molten steel that [Cat]/[Als] is in the range of 0.05-0.07, the aluminium deviation in steel is in lower region value.
Field trash shape appearance figure is see Fig. 3.Meanwhile Fig. 3 is referred to, it is 1.24 that power spectrum composition, which can calculate field trash calcium aluminum ratio, in figure,
It is worth close to calcium aluminum ratio 1.27 in theoretical field trash 12CaO 7Al2O3, i.e., the field trash generated in steel is in 12CaO7Al2O3
Near.Quantitative analysis is carried out to the chemical composition of field trash, as a result referring to table 1.
Table 1 is mingled with chemical constituent in middle Baogang's night
| Wt% | At% | |
| CK | 6.30 | 12.50 |
| OK | 26.47 | 39.39 |
| MgK | 1.22 | 1.19 |
| AlK | 27.12 | 23.94 |
| SiK | 1.30 | 1.11 |
| SK | 0.63 | 0.47 |
| CaK | 33.65 | 20.00 |
As shown in the above, the stable control of non-metallic inclusion of molten steel generation is realized using method provided by the invention
System considerably reduces the deviation of T.Al and Als in molten steel near C12A7.
The control method of high-grade pipe line steel non-metallic inclusion provided by the present invention is described in detail above.
Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is simply used
Understand the method and its core concept of the present invention in help.It should be pointed out that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these are improved and modification
Fall into the protection domain of the claims in the present invention.
Claims (5)
- A kind of 1. control method of high-grade pipe line steel non-metallic inclusion, it is characterised in that in smelting process, using aluminium as End-deoxidizer, Calcium treatment is carried out, by regulating and controlling [Cat] in molten steel/[Als] ratios, realize control molten steel terminal field trash group Into aluminium deviation in reduction molten steel, so as to improve the degree of purity of molten steel.
- 2. the control method of high-grade pipe line steel non-metallic inclusion according to claim 1, it is characterised in that the smelting Sweetening process includes：LF refining-RH refining-CC continuous castings；Or LF refining-VD application of vacuum-CC continuous castings.
- 3. the control method of high-grade pipe line steel non-metallic inclusion according to claim 1, it is characterised in that Calcium treatment RH refining or VD applications of vacuum station before or after carry out, or with the compound progress of above-mentioned operation.
- 4. the control method of high-grade pipe line steel non-metallic inclusion according to claim 1, it is characterised in that pass through tune The station of control RH refinings or VD applications of vacuum is offed normal and [Cat]/[Als] ratios in molten steel during tundish, regulates and controls and is pressed from both sides in molten steel Debris forms and aluminium deviation.
- 5. the control method of high-grade pipe line steel non-metallic inclusion according to claim 4, it is characterised in that tundish When molten steel in [Cat]/[Als] Ratio controls in the range of 0.05-0.08.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710500591.2A CN107385148A (en) | 2017-06-27 | 2017-06-27 | A kind of control method of high-grade pipe line steel non-metallic inclusion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710500591.2A CN107385148A (en) | 2017-06-27 | 2017-06-27 | A kind of control method of high-grade pipe line steel non-metallic inclusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107385148A true CN107385148A (en) | 2017-11-24 |
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| CN201710500591.2A Pending CN107385148A (en) | 2017-06-27 | 2017-06-27 | A kind of control method of high-grade pipe line steel non-metallic inclusion |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337378A (en) * | 2011-10-31 | 2012-02-01 | 首钢总公司 | Process for removing non-metallic inclusions in molten steel |
| CN104846147A (en) * | 2015-05-06 | 2015-08-19 | 南京钢铁股份有限公司 | Calcium treatment process control model |
| CN106814082A (en) * | 2016-12-29 | 2017-06-09 | 内蒙古包钢钢联股份有限公司 | The method of real-time characterization al-killed molten steel cleanliness |
-
2017
- 2017-06-27 CN CN201710500591.2A patent/CN107385148A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337378A (en) * | 2011-10-31 | 2012-02-01 | 首钢总公司 | Process for removing non-metallic inclusions in molten steel |
| CN104846147A (en) * | 2015-05-06 | 2015-08-19 | 南京钢铁股份有限公司 | Calcium treatment process control model |
| CN106814082A (en) * | 2016-12-29 | 2017-06-09 | 内蒙古包钢钢联股份有限公司 | The method of real-time characterization al-killed molten steel cleanliness |
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Application publication date: 20171124 |