CN102010926B - Process for smelting and producing medium high carbon steel - Google Patents
Process for smelting and producing medium high carbon steel Download PDFInfo
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- CN102010926B CN102010926B CN2010105562384A CN201010556238A CN102010926B CN 102010926 B CN102010926 B CN 102010926B CN 2010105562384 A CN2010105562384 A CN 2010105562384A CN 201010556238 A CN201010556238 A CN 201010556238A CN 102010926 B CN102010926 B CN 102010926B
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Abstract
The invention relates to a process for producing a steel, in particular to a process for smelting and producing a medium high carbon steel. The process comprises the steps of adding silicon aluminum calcium alloy, low-melting-point synthetic slag and alloyed alloy at the time of 1/10 of the whole tapping time in turn, ending the process of adding all the alloys at the time of 2/3 of the whole tapping time, blowing in Ar in the whole tapping process in order to turn the low-melting-point synthetic slag into emulsion droplet to be scattered into the molten steel, and blowing Ar into the molten steel for at least eight minutes after finishing tapping, wherein 3kg of silicon aluminum calcium alloy is added into a ton of steel; 5kg of low-melting-point synthetic slag is added into a ton of steel; 7-10.5 kg of high carbon in the alloyed alloy is added into a ton of steel; and 3.5kg of FeSi in the alloyed alloy is added into a ton of steel. The process of the invention can replace the medium high C steel LF refining treating process and solve the problem that the refining treating capability in the quick steel-making production is insufficient.
Description
Technical field
The present invention relates to a kind of production technique of steel, specifically a kind of smelting process for production of medium and high carbon steel.
Background technology
The smelting process for production route of high C steel is in producing in the prior art: converter smelting-tapping to 1/3 when (whole tapping time 1/3) deoxidation alloying → tapping (whole tapping time 2/3) all deoxygenated alloy alloys add that (not adding the lower melting point synthetic slag)--the Ar-continuous-casting steel pouring is blown in the LF refining to 2/3, wherein the tapping deoxidization alloying is in proper order: alloying alloy → deoxygenated alloy (Alsical).The drawback that this working method exists in the prior art is: the silicon in the alloying alloy, manganese are participated in deoxygenation; Generating more silicate is mingled with; And be difficult for removing, in addition if the LF affinability is not enough, the lifting and the variety steel that will seriously restrict quality product are produced in batches.
Summary of the invention
Technical problem to be solved by this invention is: to the shortcoming of above prior art existence; A kind of smelting process for production of medium and high carbon steel is proposed; High C steel LF refining treatment operation in can substituting; Solve refining treatment scarce capacity problem in the production of steel-making fast pace, and steel quality satisfies final performance requriements.
The technical scheme that the present invention solves above technical problem is:
A kind of smelting process for production of medium and high carbon steel, its production process route is: converter smelting-tapping deoxidization alloying--blow Ar station processing-continuous casting;
Converter smelting: metal charge goes into that stove → oxygen supply air-blowing refining → converting process adds lime, returns mine, rhombspar slag making → terminal point P, S reach smelt steel grade requirement → converter tapping to ladle.
The tapping deoxidization alloying is in proper order: 1/10 o'clock in the whole tapping time begins to add successively Alsical, lower melting point synthetic slag and alloying alloy, and 2/3 o'clock all alloy in the whole tapping time add; The Alsical add-on is 3～4Kg/ ton steel; Lower melting point synthetic slag add-on is 5～7Kg/ ton steel; The alloying alloy addition is: high-carbon FeMn is 7～10.5Kg/ ton steel, and FeSi is 3～5Kg/ ton steel;
Blowing Ar station processing sequence is: tapping process whole process is blown Ar, is distributed in the molten steel to impel the lower melting point synthetic slag to form emulsion droplet; Tapping finishes the back molten steel and blows Ar, blows 8～15 minutes Ar time.
Continuous casting: ladle molten steel → continuous casting tundish → continuous cast mold → water quench → qualified strand.
The technical scheme that the present invention further limits is:
The smelting process for production of aforesaid medium and high carbon steel, tapping finish the back molten steel and blow the Ar process control and be: molten steel is stirred blew Ar in 3～4 minutes earlier, stop afterwards stirring and blew Ar 5～10 minutes, to guarantee that slag fully reacts and deoxidation products fully floats.
The smelting process for production of aforesaid medium and high carbon steel, in the continuous casting operation: on the molten steel during continuous caster free oxygen be controlled at 15～30ppm.
The smelting process for production of aforesaid medium and high carbon steel, the lower melting point synthetic slag is composed of the following components by weight percentage, sees table 1:
Table 1
| Chemical ingredients % | SiO2 | ∑(M) | CaO | Al2O3 | MgO | H2O |
| Synthetic wash heat | ≤8 | 8～12 | 45～55 | 25～35 | ≤5 | ≤0.5 |
∑ (M) is a total metal content.
The smelting process for production of aforesaid medium and high carbon steel, Alsical are composed of the following components by weight percentage, see table 2:
Table 2
| Chemical ingredients % | Si | Ca | Al | Fe |
| SiAlCa | 14～20 | 17～25 | 25～33 | Surplus |
The smelting process for production of aforesaid medium and high carbon steel, in the alloying alloy, high-carbon FeMn is composed of the following components by weight percentage, sees table 3:
Table 3
| Chemical ingredients % | Mn | C | Fe |
| High-carbon FeMn | 43～70 | ≤57 | Surplus |
In the alloying alloy, FeSi is composed of the following components by weight percentage, sees table 4:
Table 4
| Chemical ingredients % | Si | Fe |
| FeSi | 72～80 | Surplus |
The Composition Control of lower melting point synthetic slag, Alsical and alloying alloy, to guarantee to reach the cleanliness factor of this steel grade molten steel requirement, steel quality satisfies final performance requriements, and the inclusion grade detects and can reach below 1.0 grades in the strand
Advantage of the present invention is: the present invention is put steel in converter and is added synthetic slag in earlier stage; Blowing Ar stirring merit by force through tapping process ballistic work and tapping process makes synthetic slag in molten steel, form emulsion droplet; Improve the ability of catching deoxidation products, synthetic slag is mingled with in floating-upward process absorption, polymerization is grown up and reached the effect of purify hot metal.High C steel LF refining treatment operation in can substituting through the present invention; Solve refining treatment scarce capacity problem in the production of steel-making fast pace; And energy-saving and emission-reduction, high C steel grade inclusion grade is controlled in 1.5 grades in the production, can reach the cleanliness factor of this steel grade molten steel requirement; Steel quality satisfies final performance requriements, and the inclusion grade detects and can reach below 1.0 grades in the strand.
Embodiment
Embodiment one
Present embodiment is a kind of smelting process for production of medium and high carbon steel, and its production process route is: converter smelting-tapping deoxidization alloying--blow Ar station processing-continuous casting.
Converter smelting: metal charge goes into that stove → oxygen supply air-blowing refining → converting process adds lime, returns mine, rhombspar slag making → terminal point P, S reach smelt steel grade requirement → converter tapping to ladle.
The tapping deoxidization alloying is in proper order: 1/10 o'clock in the whole tapping time begins to add successively Alsical, lower melting point synthetic slag and alloying alloy, and 2/3 o'clock all alloy in the whole tapping time add; The Alsical add-on is a 3Kg/ ton steel; Lower melting point synthetic slag add-on is a 5Kg/ ton steel; The alloying alloy addition is: high-carbon FeMn is a 7Kg/ ton steel, and FeSi is a 3Kg/ ton steel.
The lower melting point synthetic slag is composed of the following components by weight percentage, sees table 5:
Table 5
| Chemical ingredients % | SiO2 | ?∑(M) | CaO | Al2O3 | MgO | H2O |
| Synthetic wash heat | 8 | ?8 | 53.5 | 25 | 5 | 0.5 |
Alsical is composed of the following components by weight percentage, sees table 6:
Table 6
| Chemical ingredients % | Si | Ca | Al | Fe |
| SiAlCa | 14 | 17 | 33 | Surplus |
In the alloying alloy, high-carbon FeMn is composed of the following components by weight percentage, sees table 7:
Table 7
| Chemical ingredients % | Mn | C | Fe |
| High-carbon FeMn | 43 | 55 | Surplus |
In the alloying alloy, FeSi is composed of the following components by weight percentage, sees table 8:
Table 8
| Chemical ingredients % | Si | Fe |
| FeSi | 72 | Surplus |
Blowing Ar station processing sequence is: tapping process whole process is blown Ar, is distributed in the molten steel to impel the lower melting point synthetic slag to form emulsion droplet; Tapping finishes the back molten steel and blows Ar, blows 8 minutes Ar time, blows the Ar process control and is: molten steel is stirred blew Ar in 3 minutes earlier, stop afterwards stirring and blew Ar 5 minutes, to guarantee that slag fully reacts and deoxidation products fully floats.
Continuous casting: ladle molten steel → continuous casting tundish → continuous cast mold → water quench → qualified strand, in the continuous casting operation on the molten steel during continuous caster free oxygen be controlled at 15ppm.
Embodiment two
Present embodiment is a kind of smelting process for production of medium and high carbon steel, and its production process route is: converter smelting-tapping deoxidization alloying--blow Ar station processing-continuous casting.
Converter smelting: metal charge goes into that stove → oxygen supply air-blowing refining → converting process adds lime, returns mine, rhombspar slag making → terminal point P, S reach smelt steel grade requirement → converter tapping to ladle.
The tapping deoxidization alloying is in proper order: 1/10 o'clock in the whole tapping time begins to add successively Alsical, lower melting point synthetic slag and alloying alloy, and 2/3 o'clock all alloy in the whole tapping time add; The Alsical add-on is a 3.5Kg/ ton steel; Lower melting point synthetic slag add-on is a 6Kg/ ton steel; The alloying alloy addition is: high-carbon FeMn is a 9Kg/ ton steel, and FeSi is a 4Kg/ ton steel.
The lower melting point synthetic slag is composed of the following components by weight percentage, sees table 9:
Table 9
| Chemical ingredients % | SiO2 | ?∑(M) | CaO | Al2O3 | MgO | H2O |
| Synthetic wash heat | 7 | ?10 | 48.7 | 30 | 4 | 0.3 |
Alsical is composed of the following components by weight percentage, sees table 2:
Table 10
| Chemical ingredients % | Si | Ca | Al | Fe |
| SiAlCa | 18 | 20 | 30 | Surplus |
In the alloying alloy, high-carbon FeMn is composed of the following components by weight percentage, sees table 3:
Table 11
| Chemical ingredients % | Mn | C | Fe |
| High-carbon FeMn | 55 | 40 | Surplus |
In the alloying alloy, FeSi is composed of the following components by weight percentage, sees table 4:
Table 12
| Chemical ingredients % | Si | Fe |
| FeSi | 78 | Surplus |
Blowing Ar station processing sequence is: tapping process whole process is blown Ar, is distributed in the molten steel to impel the lower melting point synthetic slag to form emulsion droplet; Tapping finishes the back molten steel and blows Ar, blows 12 minutes Ar time, blows the Ar process control and is: molten steel is stirred blew Ar in 3.5 minutes earlier, stop afterwards stirring and blew Ar8 minute, to guarantee that slag fully reacts and deoxidation products fully floats.
Continuous casting: ladle molten steel → continuous casting tundish → continuous cast mold → water quench → qualified strand, in the continuous casting operation on the molten steel during continuous caster free oxygen be controlled at 22ppm.
Embodiment three
Present embodiment is a kind of smelting process for production of medium and high carbon steel, and its production process route is: converter smelting-tapping deoxidization alloying--blow Ar station processing-continuous casting.
Converter smelting: metal charge goes into that stove → oxygen supply air-blowing refining → converting process adds lime, returns mine, rhombspar slag making → terminal point P, S reach smelt steel grade requirement → converter tapping to ladle.
The tapping deoxidization alloying is in proper order: 1/10 o'clock in the whole tapping time begins to add successively Alsical, lower melting point synthetic slag and alloying alloy, and 2/3 o'clock all alloy in the whole tapping time add; The Alsical add-on is a 4Kg/ ton steel; Lower melting point synthetic slag add-on is a 7Kg/ ton steel; The alloying alloy addition is: high-carbon FeMn is a 10.5Kg/ ton steel, and FeSi is a 5Kg/ ton steel.
The lower melting point synthetic slag is composed of the following components by weight percentage, sees table 13:
Table 13
| Chemical ingredients % | SiO2 | ?∑(M) | CaO | Al2O3 | MgO | H2O |
| Synthetic wash heat | 5 | ?12 | 55 | 26.9 | 1 | ≤0.1 |
Alsical is composed of the following components by weight percentage, sees table 14:
Table 14
| Chemical ingredients % | Si | Ca | Al | Fe |
| SiAlCa | 20 | 25 | 33 | Surplus |
In the alloying alloy, high-carbon FeMn is composed of the following components by weight percentage, sees table 15:
Table 15
| Chemical ingredients % | Mn | C | Fe |
| High-carbon FeMn | 70 | 29 | Surplus |
In the alloying alloy, FeSi is composed of the following components by weight percentage, sees table 16:
Table 16
| Chemical ingredients % | Si | Fe |
| FeSi | 80 | Surplus |
Blowing Ar station processing sequence is: tapping process whole process is blown Ar, is distributed in the molten steel to impel the lower melting point synthetic slag to form emulsion droplet; Tapping finishes the back molten steel and blows Ar, blows 15 minutes Ar time, blows the Ar process control and is: molten steel is stirred blew Ar in 4 minutes earlier, stop afterwards stirring and blew Ar 10 minutes, to guarantee that slag fully reacts and deoxidation products fully floats.
Continuous casting: ladle molten steel → continuous casting tundish → continuous cast mold → water quench → qualified strand, in the continuous casting operation on the molten steel during continuous caster free oxygen be controlled at 30ppm.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.
Claims (3)
1. the smelting process for production of a medium and high carbon steel, it is characterized in that: its production process route is: converter smelting-tapping deoxidization alloying--blow Ar station processing-continuous casting;
Said tapping deoxidization alloying is in proper order: 1/10 o'clock in the whole tapping time begins to add successively Alsical, lower melting point synthetic slag and alloying alloy, and 2/3 o'clock all alloy in the whole tapping time add; Said Alsical add-on is 3～4Kg/ ton steel; Said lower melting point synthetic slag add-on is 5～7Kg/ ton steel; Said alloying alloy addition is: high-carbon FeMn is 7～10.5Kg/ ton steel, and FeSi is 3～5Kg/ ton steel;
The said Ar of blowing station processing sequence is: tapping process whole process is blown Ar, is distributed in the molten steel to impel the lower melting point synthetic slag to form emulsion droplet; Tapping finishes the back molten steel and blows Ar, blows 8～15 minutes Ar time;
Said lower melting point synthetic slag is composed of the following components by weight percentage: SiO
2:≤8%, ∑ (M): 8～12%, CaO:45～55%, Al
2O
3: 25～35%, MgO :≤5%, H
2O :≤0.5%, ∑ (M) is a total metal content;
Said Alsical is composed of the following components by weight percentage: Si:14～20%, Ca:17～25%, Al:25～33%, Fe: surplus;
In the said alloying alloy, high-carbon FeMn is composed of the following components by weight percentage: Mn:43～70%, and C :≤57%, Fe: surplus; In the said alloying alloy, FeSi is composed of the following components by weight percentage: Si:72～80%, Fe: surplus.
2. the smelting process for production of medium and high carbon steel as claimed in claim 1; It is characterized in that: tapping end back molten steel blows the Ar process control and is: molten steel is stirred blew Ar in 3～4 minutes earlier; Stop afterwards stirring and blew Ar 5～10 minutes, to guarantee that slag fully reacts and deoxidation products fully floats.
3. the smelting process for production of medium and high carbon steel as claimed in claim 1 is characterized in that: in the said continuous casting operation: on the molten steel during continuous caster free oxygen be controlled at 15～30ppm.
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| CN2010105562384A CN102010926B (en) | 2010-11-24 | 2010-11-24 | Process for smelting and producing medium high carbon steel |
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| CN2010105562384A CN102010926B (en) | 2010-11-24 | 2010-11-24 | Process for smelting and producing medium high carbon steel |
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| CN102010926B true CN102010926B (en) | 2012-06-06 |
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| CN102688992A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for synthetic slag washing of tundish |
| CN106399632B (en) * | 2016-09-09 | 2018-06-08 | 武汉钢铁有限公司 | A kind of high-carbon steel carburetion method |
| CN106563780B (en) * | 2016-10-31 | 2018-11-13 | 山东钢铁股份有限公司 | The continuous cast method of high alloy tool steel large round billet in a kind of medium high carbon |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377977A (en) * | 2002-01-17 | 2002-11-06 | 刘跃 | Synthetic slag for reducing oxygen and sulfur content in molten steel and its slag making method |
| CN1441068A (en) * | 2002-02-25 | 2003-09-10 | 孙富卿 | Molten mixed slag for refining and desulfurizing steel |
| CN101403021A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Utilization method for steel scoria |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377977A (en) * | 2002-01-17 | 2002-11-06 | 刘跃 | Synthetic slag for reducing oxygen and sulfur content in molten steel and its slag making method |
| CN1441068A (en) * | 2002-02-25 | 2003-09-10 | 孙富卿 | Molten mixed slag for refining and desulfurizing steel |
| CN101403021A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Utilization method for steel scoria |
Non-Patent Citations (1)
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|---|
| JP昭5534653A 1980.03.11 |
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