CN102847897B - Protecting slag for sulphur-containing free-cutting steel crystallizer and use process - Google Patents
Protecting slag for sulphur-containing free-cutting steel crystallizer and use process Download PDFInfo
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- CN102847897B CN102847897B CN201210292280.9A CN201210292280A CN102847897B CN 102847897 B CN102847897 B CN 102847897B CN 201210292280 A CN201210292280 A CN 201210292280A CN 102847897 B CN102847897 B CN 102847897B
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- cutting steel
- sulphur
- sulphur free
- graphite powder
- cao
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Abstract
The invention relates to a protecting slag in the metallurgical field, and particularly relates to a use process for a protecting slag used for covering and protecting the surface of molten steel in a crystallizer during sulphur-containing free-cutting steel pouring. The protecting slag comprises SiO2, Al2O3, MgO, CaO and solid-state carbon, and further comprises graphite powder and silico-calcium powder, wherein the percentage by weight of the graphite powder accounting for the whole protecting slag is 2.0-8.0%, and the percentage by weight of the silico-calcium powder accounting for the whole protecting slag is 1.0-4.0%. The protecting slag disclosed by the invention can be used for covering and protecting the surface of molten steel in the crystallizer during sulphur-containing free-cutting steel pouring, lubricating the surface of a casting blank, and reducing the surface pinholes of the sulphur-containing free-cutting steel casting blank; and via reduction for the surface pinholes of the casting blank, a procedure of 'removing skin' for the surface of the casting blank is cancelled, thus improving the quality of the surface of the casting blank, and the yield.
Description
Technical field
The present invention relates to a kind of covering slag of field of metallurgy, the covering slag operation of a kind of molten steel in mold surface coverage protection when pouring into a mould for sulphur free-cutting steel specifically.
Background technology
For ensureing sulphur free-cutting steel cutting ability, Standard [S] content controls in 0.350 ~ 0.400% scope, [O] content must control at 40 ~ 60ppm to ensure the stability of [S] content, due in molten steel in mold process of setting, when the gas that in [O] and molten steel, other composition effects are formed overflows from molten steel in mold capture by the base shell near meniscus, thus form surface pinholes at casting billet surface, cause strand must increase " stripping off the skin " operation together before the rolling, such lumber recovery can decline greatly, cost can increase, the incomplete strand that " strips off the skin " can be formed when rolling and scabs and sentence useless.The covering slag sulphur free-cutting steel strand used in prior art requires 100% " stripping off the skin ", causes cost higher.
Summary of the invention
Technical problem to be solved by this invention is; for the shortcoming that above prior art exists; a kind of sulphur free-cutting steel crystallizer protecting residue operation is proposed; sulfur-bearing automatic steel casting billet surface pin hole can be made to reduce; cancel casting billet surface by the minimizing of casting billet surface pin hole " to strip off the skin " operation, thus improve cc billet surface quality and lumber recovery.
The technical scheme that the present invention solves above technical problem is:
A kind of sulphur free-cutting steel crystallizer protecting residue, comprises SiO
2, AL
2o
3, MgO, CaO and solid carbon, also comprise graphite powder and silicon calcium powder, the percentage by weight that graphite powder accounts for whole covering slag is 2.0% ~ 8.0%, and the percentage by weight that silicon calcium powder accounts for whole covering slag is 1.0% ~ 4.0%.
The operation of sulphur free-cutting steel crystallizer protecting residue, molten steel in mold temperature: 1530 ~ 1550 DEG C, Oxygen Content in Liquid Steel: 40 ~ 60ppm; Sulphur free-cutting steel pulling rate :≤2.3m/min, crystallizer cooling water inflow: 2200 ± 100L/min, specific water: 0.85L/Kg.
Like this, silicon calcium powder can react with [O] in molten steel and generate heat, graphite powder can make the thinning spilling being conducive to gas of meniscus base shell with coordinating of silicon calcium powder, and silicon calcium powder and [O] product can enter into liquid slag layer simultaneously, lubricate strand.
The technical scheme that the present invention limits further is:
Aforesaid sulphur free-cutting steel crystallizer protecting residue, its weight percent composition is: SiO
2: 28.0% ~ 35.0%, AL
2o
3: 6.5% ~ 8.0%, MgO:1.5% ~ 3.5%, CaO:35.0% ~ 40.5%, solid carbon: 7.0% ~ 10.0%, graphite powder: 2.0% ~ 8.0%, silicon calcium powder: 1.0 ~ 4.0%, Na
2o:2.5% ~ 4.5%, above each component sum is 100%.
Aforesaid sulphur free-cutting steel crystallizer protecting residue, its weight percent composition is: SiO
2: 33%, AL
2o
3: 7%, MgO:3%, CaO:38%, solid carbon: 9%, graphite powder: 4%, silicon calcium powder: 2%, Na
2o:4%.
Aforesaid sulphur free-cutting steel crystallizer protecting residue, its weight percent composition is: SiO
2: 28%, AL
2o
3: 8%, MgO:3.5%, CaO:39.5%, solid carbon: 7%, graphite powder: 8%, silicon calcium powder: 3.5%, Na
2o:2.5%.
Aforesaid sulphur free-cutting steel crystallizer protecting residue, its weight percent composition is: SiO
2: 35%, AL
2o
3: 6.5%, MgO:1.5%, CaO:37%, solid carbon: 10%, graphite powder: 3%, silicon calcium powder: 2.5%, Na
2o:4.5%.
The invention has the beneficial effects as follows: covering slag of the present invention not only can be used for the covering protection on molten steel in mold surface when sulphur free-cutting steel is poured into a mould; the lubrication of casting billet surface can also be made; sulfur-bearing automatic steel casting billet surface pin hole can be made to reduce; cancel casting billet surface by the minimizing of casting billet surface pin hole " to strip off the skin " operation, thus improve cc billet surface quality and lumber recovery.Use covering slag of the present invention, sulphur free-cutting steel strand can be produced in batches and without the need to " stripping off the skin " operation, lumber recovery improves about 15%, and ton steel cost reduces about 160 yuan, greatly improves the market competitiveness.
Detailed description of the invention
embodiment 1
The sulphur free-cutting steel crystallizer protecting residue of the present embodiment, its weight percent composition is: SiO
2: 33%, AL
2o
3: 7%, MgO:3%, CaO:38%, solid carbon: 9%, graphite powder: 4%, silicon calcium powder: 2%, Na
2o:4%.
The operation of the sulphur free-cutting steel crystallizer protecting residue of the present embodiment, molten steel in mold temperature: 1530 DEG C, Oxygen Content in Liquid Steel: 40ppm; Sulphur free-cutting steel pulling rate: 2.3m/min, crystallizer cooling water inflow: 2200L/min, specific water: 0.85L/Kg.
embodiment 2
The sulphur free-cutting steel crystallizer protecting residue of the present embodiment, its weight percent composition is: SiO
2: 28%, AL
2o
3: 8%, MgO:3.5%, CaO:39.5%, solid carbon: 7%, graphite powder: 8%, silicon calcium powder: 3.5%, Na
2o:2.5%.
The operation of the sulphur free-cutting steel crystallizer protecting residue of the present embodiment, molten steel in mold temperature: 1540 DEG C, Oxygen Content in Liquid Steel: 50ppm; Sulphur free-cutting steel pulling rate: 2.0m/min, crystallizer cooling water inflow: 2300L/min, specific water: 0.85L/Kg.
embodiment 3
The sulphur free-cutting steel crystallizer protecting residue of the present embodiment, its weight percent composition is: SiO
2: 35%, AL
2o
3: 6.5%, MgO:1.5%, CaO:37%, solid carbon: 10%, graphite powder: 3%, silicon calcium powder: 2.5%, Na
2o:4.5%.
The operation of the sulphur free-cutting steel crystallizer protecting residue of the present embodiment, molten steel in mold temperature: 1550 DEG C, Oxygen Content in Liquid Steel: 60ppm; Sulphur free-cutting steel pulling rate: 2.1m/min, crystallizer cooling water inflow: 2100L/min, specific water: 0.85L/Kg.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. a sulphur free-cutting steel crystallizer protecting residue, comprises SiO
2, AL
2o
3, MgO, CaO and solid carbon, also comprise graphite powder and silicon calcium powder, described solid carbon does not comprise graphite powder; It is characterized in that:
The weight percent composition of described sulphur free-cutting steel crystallizer protecting residue is: SiO
2: 28.0% ~ 35.0%, AL
2o
3: 6.5% ~ 8.0%, MgO:1.5% ~ 3.5%, CaO:35.0% ~ 40.5%, solid carbon: 7.0% ~ 10.0%, graphite powder: 2.0% ~ 8.0%, silicon calcium powder: 1.0 ~ 4.0%, Na
2o:2.5% ~ 4.5%, above each component sum is 100%.
2. sulphur free-cutting steel crystallizer protecting residue as claimed in claim 1, is characterized in that: its weight percent composition is: SiO
2: 33%, AL
2o
3: 7%, MgO:3%, CaO:38%, solid carbon: 9%, graphite powder: 4%, silicon calcium powder: 2%, Na
2o:4%.
3. sulphur free-cutting steel crystallizer protecting residue as claimed in claim 1, is characterized in that: its weight percent composition is: SiO
2: 28%, AL
2o
3: 8%, MgO:3.5%, CaO:39.5%, solid carbon: 7%, graphite powder: 8%, silicon calcium powder: 3.5%, Na
2o:2.5%.
4. sulphur free-cutting steel crystallizer protecting residue as claimed in claim 1, is characterized in that: its weight percent composition is: SiO
2: 35%, AL
2o
3: 6.5%, MgO:1.5%, CaO:37%, solid carbon: 10%, graphite powder: 3%, silicon calcium powder: 2.5%, Na
2o:4.5%.
5. the operation of the sulphur free-cutting steel crystallizer protecting residue as described in claim arbitrary in claim 1-4, is characterized in that: molten steel in mold temperature: 1530 ~ 1550 DEG C, Oxygen Content in Liquid Steel: 40 ~ 60ppm; Sulphur free-cutting steel pulling rate :≤2.3m/min, crystallizer cooling water inflow: 2200 ± 100L/min, specific water: 0.85L/Kg.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292280.9A CN102847897B (en) | 2012-08-17 | 2012-08-17 | Protecting slag for sulphur-containing free-cutting steel crystallizer and use process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292280.9A CN102847897B (en) | 2012-08-17 | 2012-08-17 | Protecting slag for sulphur-containing free-cutting steel crystallizer and use process |
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| Publication Number | Publication Date |
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| CN102847897A CN102847897A (en) | 2013-01-02 |
| CN102847897B true CN102847897B (en) | 2015-07-22 |
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| CN201210292280.9A Active CN102847897B (en) | 2012-08-17 | 2012-08-17 | Protecting slag for sulphur-containing free-cutting steel crystallizer and use process |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325102B (en) * | 2014-11-25 | 2016-08-24 | 山东钢铁股份有限公司 | The molding casting method of steel band fed by a kind of crystallizer |
| CN110538973B (en) * | 2018-05-29 | 2021-09-17 | 宝山钢铁股份有限公司 | Light-weight fluorine-free environment-friendly continuous casting covering slag special for enamel steel |
| CN110722119B (en) * | 2019-10-25 | 2021-12-07 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
| CN110918915A (en) * | 2019-12-12 | 2020-03-27 | 广东韶钢松山股份有限公司 | Crystallizer casting powder |
| CN112756572A (en) * | 2020-12-24 | 2021-05-07 | 芜湖新兴铸管有限责任公司 | Special covering slag for low-carbon tellurium-containing high-sulfur free-cutting steel crystallizer and preparation method thereof |
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| SU1541296A1 (en) * | 1987-07-06 | 1990-02-07 | Макеевский Труболитейный Завод Им.В.В.Куйбышева | Inoculating composition |
| CN1163329C (en) * | 1999-12-29 | 2004-08-25 | 宝山钢铁股份有限公司 | Pre-fused exothermal pouring slag |
| CN100443215C (en) * | 2006-08-25 | 2008-12-17 | 重庆大学 | Protective slag for ultralow carbon steel continuous casting |
| CN100432240C (en) * | 2006-12-21 | 2008-11-12 | 马鞍山中冶钢铁冶金科技实业有限公司 | Electric furnace highly effective metallurgy complexing agent |
| CN101530896B (en) * | 2008-03-14 | 2011-06-15 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN101982257B (en) * | 2010-10-15 | 2014-04-23 | 河南通宇冶材集团有限公司 | Specific crystallizer casting powder for sulphur free-cutting steel |
| CN102211160B (en) * | 2011-05-13 | 2013-02-27 | 攀钢集团有限公司 | Continuous casting method of sulfur-containing easy-cutting pinion steel |
| CN102303108B (en) * | 2011-09-22 | 2016-06-01 | 首钢贵阳特殊钢有限责任公司 | A kind of continuous casting manufacturing technique improving automatic steel slab quality |
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