CN1318165C - Coverage dregs for ladle - Google Patents
Coverage dregs for ladle Download PDFInfo
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- CN1318165C CN1318165C CNB2004100166287A CN200410016628A CN1318165C CN 1318165 C CN1318165 C CN 1318165C CN B2004100166287 A CNB2004100166287 A CN B2004100166287A CN 200410016628 A CN200410016628 A CN 200410016628A CN 1318165 C CN1318165 C CN 1318165C
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Abstract
The present invention relates to covering slag for ladles, which mainly comprises 20 to 55% of CaO, 8 to 30% of SiO2, 2 to 12 % of MgO and 8 to 30 % of Al2O3; the melting point of the slag is from 1390 to 1430 DEG C; the covering slag for ladles also comprises a small amount of sulfide additives which can be 0.5 to 4.2% of FeS. The covering slag for ladles can reduce the loss of Al content and S content in the ladles in the process of the continuous casting of liquid steel, and the covering slag for ladles has a good effect on the stability of the rest ingredients in the steel.
Description
Technical field
The present invention relates to a kind of ladle covering slag, specifically, relate in a kind of smelting iron and steel continuous casting field, be applicable to smelt and during the continuous casting orientation silicon steel as the covering slag of ladle.
Background technology
Orientation silicon steel contains and is lower than 4% the Si (percentage of weight, down together), the Al of 0.001-0.08%, the S of 0.01-0.04%, and element such as Mn, P, C, its composition characteristic is that sulfur content is higher and aluminium content is lower, and the permission narrow fluctuation range of aluminium and sulfur content, and composition exceeds the magnetic that allowed band will be damaged finished product.Molten steel need be adjusted composition when external refining, and then continuous casting becomes base.In casting process, molten steel is finished until cast by the insulation of ladle splendid attire.Because casting process needs 1-2 consuming time hour, insulating process makes the interior molten steel composition of ladle change easily for a long time, needs to adopt the top slag to cover with the stabilized steel water constituent its basicity (CaO/SiO
2) generally between 0.8-2.5, but basic slag (is CaO/SiO
2＞1 slag) effect of desulfurization is arranged, cause that the sulfur content in the steel reduces.And the SiO in the acid slag
2Again easily with molten steel in the Al reaction be unfavorable for the stable of molten steel composition, in the application of historical facts or anecdotes border, the composition range of covering slag is narrow, operating flexibility is little, for actual production is made troubles.However, sulphur in the molten steel and aluminium still change easily and cause finished product silicon steel magnetic variation.
Summary of the invention
The object of the present invention is to provide a kind of ladle covering slag, it can reduce the loss of aluminium and sulfur content in the ladle in the continuous casting of molten steel process, and all the other compositions in the steel stable had good result.
For achieving the above object, ladle covering slag provided by the invention, its main component is CaO, SiO
2, MgO, Al
2O
3The percentage composition of CaO is: 20-55%, SiO
2Percentage composition be: 8-30%, Al
2O
3Percentage composition be: 15-45%, the percentage composition of MgO is: 2-12%, slag melting be at 1390-1430 ℃, and also comprise a spot of sulphur compounds additive, this sulphur compounds additive can be the FeS additive, the percentage composition of this additive is 0.5-4.2%.
Further, in the described covering slag, the percentage composition of CaO is: 21-37%, SiO
2Percentage composition be: 15-23%, the percentage composition of MgO is: 10%, the percentage composition of FeS is: 3.2%, and Al
2O
3Be surplus;
In the described covering slag, the percentage composition of CaO also can be 28-50%, SiO
2Percentage composition be 10-25%, the percentage composition of MgO is: 10%, the percentage composition of FeS is: 2.5-4.2%, and Al
2O
3Be surplus;
In the described covering slag, the percentage composition of CaO also can be 20-35%, SiO
2Percentage composition be 18-35%, the percentage composition of MgO is: 10%, the percentage composition of FeS is: 0.5-2.2%, and Al
2O
3Be surplus;
Adopt this covering slag, can reduce the loss of sour molten aluminium, sulphur and other composition in the molten steel.And the variation of each composition allows bigger scope in the slag, has good flowability and heat-insulating property.
The specific embodiment
Embodiment 1
On the 100kg induction furnace, utilize the present invention, carry out orientation silicon steel top slag cover butter.The orientation silicon steel composition of test is: the percentage composition of C is: 0.04%, the percentage composition of Si is: 2.90%, the percentage composition of Al is: 0.016%, the percentage composition of S is: 0.019%, the percentage composition of Mn is: 0.08%, the covering slag main component that adopts is: the percentage composition of CaO is 21-37%, SiO
2Percentage composition be 15-23%, the percentage composition of Mg is: 10%, the percentage composition of FeS is: 3.2%, and Al
2O
3Be surplus, test temperature 1550-1570 ℃, covering slag adds after molten steel melts fully and makes it to be covered in fully liquid steel level.Adjust molten steel to target component, molten steel insulation 50 minutes, sampling survey molten steel composition is once more: the percentage composition of C is: 0.04%, the percentage composition of Si is: 2.88%, the percentage composition of Al is: 0.014%, the percentage composition of S is: 0.018%, and the percentage composition of Mn is: 0.08%, the fluctuation of all the components is all in allowed band.Concrete situation of change and requirement see Table 1 (the actual constituent variable quantity is poor for the composition before and after the insulation 50 minutes in the table, raise with+, descend with-.Permission composition excursion is that the composition fluctuation bound of technological requirement is poor, unit: the percentage of weight, %.Down together):
| C | Si | Mn | Al | S | |
| The actual constituent variable quantity | 0 | -0.02 | 0 | -0.002 | -0.001 |
| Allow the composition excursion | 0.012 | 0.15 | 0.012 | 0.005 | 0.006 |
Table 1
Embodiment 2
On the 100kg induction furnace, utilize the present invention, carry out orientation silicon steel top slag cover butter.The orientation silicon steel composition of test is: the percentage composition of C is: 0.08%, the percentage composition of Si is: 3.05%, the percentage composition of Al is: 0.023%, the percentage composition of S is: 0.021%, the percentage composition of Mn is: 0.08%, the covering slag main component that adopts is: the percentage composition of CaO is 28-50%, SiO
2Percentage composition be 10-25%, the percentage composition of MgO is: 10%, the percentage composition of FeS is: 2.5-4.2%, and Al
2O
3Be surplus, test temperature is 1550-1570 ℃, and covering slag adds after molten steel melts fully and makes it to cover fully the molten steel face.Adjust molten steel to target component, molten steel insulation 50 minutes, sampling survey molten steel composition is once more: the percentage composition of C is: 0.07%, the percentage composition of Si is: 3.04%, the percentage composition of Al is: 0.020%, the percentage composition of S is: 0.021%, and the percentage composition of Mn is: 0.08%, the fluctuation of all the components is all in allowed band.Concrete situation of change and requirement see Table 2:
| C | Si | Mn | Al | S | |
| The actual constituent variable quantity | -0.01 | -0.01 | 0 | -0.003 | 0 |
| Allow the composition excursion | 0.014 | 0.25 | 0.02 | 0.010 | 0.006 |
Table 2
Embodiment 3
On the 50kg intermediate frequency furnace, utilize the present invention, carried out orientation silicon steel top slag cover butter.The orientation silicon steel composition of test is: the percentage composition of C is: 0.03%, the percentage composition of Si is: 3.14%, and the percentage composition of Al is: 0.0060%, the percentage composition of S is: 0.028%, the covering slag main component that adopts is: the percentage composition of CaO is 20-35%, SiO
2Percentage composition be 18-35%, the percentage composition of MgO is 10%, the percentage composition of FeS is 0.5-2.2%, and Al
2O
3Be surplus, test temperature 153C-1560 ℃, covering slag adds after molten steel melts fully and makes it to cover fully the molten steel face.Adjust molten steel to target component, molten steel insulation 40 minutes, sampling survey molten steel composition is once more: the percentage composition of C is 0.03%, the percentage composition of Si is 3.15%, the percentage composition of Al is 0.0050%, and the percentage composition of S is 0.028%, and the fluctuation of all the components is all in allowed band.Concrete situation of change and requirement see Table 3:
| C | Si | Mn | Al | S | |
| The actual constituent variable quantity | 0 | 0.01 | -0.001 | 0 | |
| Allow the composition excursion | 0.01 | 0.15 | 0.012 | 0.005 | 0.006 |
Table 3
As can be seen from the above-described embodiment, adopt the present invention after, can guarantee the stable of sour molten aluminium and sulfur content in the molten steel simultaneously.Record through experiment, behind use the present invention, molten steel can be incubated 50 minutes at 1530-1590 ℃, the loss of aluminium＜13% in the molten steel, the loss of S＜8%.Satisfy the requirement of strand (ingot) composition.
Claims (4)
1. ladle covering slag, it comprises basic slag, and this basic slag ingredient is CaO, SiO
2, MgO, Al
2O
3Be characterised in that, also comprise sulphur compounds additive FeS, and the percentage by weight of CaO is: 20-55%, SiO
2The percentage of weight is: 8-30%, Al
2O
3The percentage of weight is: 15-45%, the percentage of MgO weight is: 2-12%, the percentage of sulphur compounds additive FeS are 0.5-4.2%, and slag melting is at 1390-1430 ℃.
2. ladle covering slag as claimed in claim 1 is characterized in that, the percentage by weight of CaO is: 21-37%, SiO
2Percentage by weight be: 15-23%, the percentage of MgO weight is: 10%, the percentage of FeS weight is: 3.2%, and Al
2O
3Percentage by weight be surplus.
3. ladle covering slag as claimed in claim 1 is characterized in that, the percentage by weight of CaO is 28-50%, SiO
2Percentage by weight be 10-25%, the percentage by weight of MgO is: 10%, the percentage by weight of FeS is: 2.5-4.2%, and Al
2O
3Percentage by weight be surplus.
4. ladle covering slag as claimed in claim 1 is characterized in that, the percentage by weight of CaO is 20-35%, SiO
2Percentage by weight be 18-35%, the percentage by weight of MgO is: 10%, the percentage by weight of FeS is: 0.5-2.2%, and Al
2O
3Percentage by weight be surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100166287A CN1318165C (en) | 2004-02-27 | 2004-02-27 | Coverage dregs for ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100166287A CN1318165C (en) | 2004-02-27 | 2004-02-27 | Coverage dregs for ladle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1660521A CN1660521A (en) | 2005-08-31 |
| CN1318165C true CN1318165C (en) | 2007-05-30 |
Family
ID=35010246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100166287A Expired - Fee Related CN1318165C (en) | 2004-02-27 | 2004-02-27 | Coverage dregs for ladle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1318165C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773995B (en) * | 2010-01-21 | 2013-02-13 | 河南省西保冶材集团有限公司 | Water-cooled die casting function protective material |
| CN102191355A (en) * | 2011-04-07 | 2011-09-21 | 攀钢集团有限公司 | Covering agent for steel smelting, and preparation method thereof |
| CN105779780B (en) * | 2016-05-30 | 2018-04-03 | 重庆钢铁(集团)有限责任公司 | A kind of electroslag remelting free-floride slag and its method for electroslag remelting |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85107824A (en) * | 1985-10-17 | 1987-04-22 | 东北工学院 | With the borax slag is the pouring in steel smelting covering slag of principal constituent |
| CN87104146A (en) * | 1987-06-09 | 1988-04-20 | 开封高压阀门厂 | Insulating covering agent |
| CN1039447A (en) * | 1988-07-22 | 1990-02-07 | 沃斯特-阿尔派因多纳维茨钢铁股份有限公司 | The method and the equipment therefor thereof of heating molten steel |
| CN1063634A (en) * | 1992-01-26 | 1992-08-19 | 田志晓 | Low carbon protective slag for die casting |
| CN1101867A (en) * | 1994-10-25 | 1995-04-26 | 上海钢铁工艺技术研究所 | Protecting slag of continuous casting and base for preparing this slag |
| CN1270862A (en) * | 2000-04-30 | 2000-10-25 | 钢铁研究总院 | Protective scoria for continuous casting of ultralow carbon steel |
| CN1320709A (en) * | 2001-03-06 | 2001-11-07 | 江苏江南铁合金有限公司 | Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN1382810A (en) * | 2002-03-12 | 2002-12-04 | 马晓明 | Spherical Al slag and its preparing process |
| CN1526493A (en) * | 2003-09-19 | 2004-09-08 | 宜兴振球炉料有限公司 | Douring basket protecting slag for continuous casting and its prepn |
-
2004
- 2004-02-27 CN CNB2004100166287A patent/CN1318165C/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85107824A (en) * | 1985-10-17 | 1987-04-22 | 东北工学院 | With the borax slag is the pouring in steel smelting covering slag of principal constituent |
| CN87104146A (en) * | 1987-06-09 | 1988-04-20 | 开封高压阀门厂 | Insulating covering agent |
| CN1039447A (en) * | 1988-07-22 | 1990-02-07 | 沃斯特-阿尔派因多纳维茨钢铁股份有限公司 | The method and the equipment therefor thereof of heating molten steel |
| CN1063634A (en) * | 1992-01-26 | 1992-08-19 | 田志晓 | Low carbon protective slag for die casting |
| CN1101867A (en) * | 1994-10-25 | 1995-04-26 | 上海钢铁工艺技术研究所 | Protecting slag of continuous casting and base for preparing this slag |
| CN1270862A (en) * | 2000-04-30 | 2000-10-25 | 钢铁研究总院 | Protective scoria for continuous casting of ultralow carbon steel |
| CN1320709A (en) * | 2001-03-06 | 2001-11-07 | 江苏江南铁合金有限公司 | Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN1382810A (en) * | 2002-03-12 | 2002-12-04 | 马晓明 | Spherical Al slag and its preparing process |
| CN1526493A (en) * | 2003-09-19 | 2004-09-08 | 宜兴振球炉料有限公司 | Douring basket protecting slag for continuous casting and its prepn |
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|---|---|
| CN1660521A (en) | 2005-08-31 |
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Granted publication date: 20070530 Termination date: 20140227 |