CN103008590A - Continuous casting mold covering slag for medium carbon steel containing manganese - Google Patents
Continuous casting mold covering slag for medium carbon steel containing manganese Download PDFInfo
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- CN103008590A CN103008590A CN2012105234980A CN201210523498A CN103008590A CN 103008590 A CN103008590 A CN 103008590A CN 2012105234980 A CN2012105234980 A CN 2012105234980A CN 201210523498 A CN201210523498 A CN 201210523498A CN 103008590 A CN103008590 A CN 103008590A
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- slag
- covering slag
- carbon steel
- continuous casting
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Abstract
The invention relates to continuous casting mold covering slag for medium carbon steel containing manganese. The covering slag is characterized by comprising the following components in percentage by weight: 30.0-40.0 percent of SiO2, 13.0-22.3 percent of CaO, 2.0-7.0 percent of MgO, 3.0-6.0 percent of Al2O3, 1.0-3.0 percent of Fe2O3, 1.0-4.2 percent of MnO, 1.2-5.0 percent of Na2O, 2-7.3 percent of F, 12-21.3 percent of C, less than or equal to 2.0 percent of K2O, less than or equal to 1.0 percent of Li2O, less than or equal to 1.0 percent of B2O3, less than or equal to 0.6 percent of TiO2, and the balance of water and inevitable impurities. The continuous casting mold covering slag has the advantages of low alkalinity, low viscosity, uniform heat flow, high fluidity and stability of molten slag in a low temperature state, effective control over the uniformity of heat flow in the casting mold, suitability for an efficient and stable billet continuous casting production process, and great improvements on the quality and the yield of a casting blank.
Description
Technical field
The invention belongs to the steel-making continuous casting technical field, particularly a kind of Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag.
Background technology
In continuous casting production process; crystallizer protecting residue is one of most important auxiliary material in the continuous casting production process; its physicochemical property directly affects the steady production of continuous casting and the Quality and yield of strand, joins covering slag in the crystallizer and must have suitable physicochemical property and just can give full play to its five large metallurgical function: covering and heat insulating, prevent secondary oxidation, absorb inclusion, lubricate between crystallizer and strand and improve crystallizer and strand between heat transfer.
Medium Carbon Steel Containing Manganese is compared with other steel grade has following characteristics: 1) thermal conductivity low (only for medium carbon steel 1/3-1/2), and solidification of molten steel is slow, and tree-shaped trichite reaches; 2) high-temp plastic is poor; 3) easily crack, [C] is between 0.3%--0.4% in the Medium Carbon Steel Containing Manganese, [C]＜all has delta ferrite to generate during 0.50% molten steel crystallization, according to the decline along with temperature of the difference of phosphorus content, the delta ferrite that generates in the austenite transition process often with solidification shrinkage, produce thermal stress, very large to the sensitiveness of crackle.Because Medium Carbon Steel Containing Manganese has These characteristics, in casting process, it is mobile and stable preferably that the interior slag of crystallizer is had under the condition of high temperature, so just can control heat transfer between crystallizer wall and solidified shell and lubricated well, otherwise very easily cause in process of production the generation of strand longitudinal crack.
In the Medium Carbon Steel Containing Manganese casting cycle; the covering slag that joins in the crystallizer very easily reacts with molten steel; MnO content will increase with the increase of manganese content in the steel in the covering slag; thereby cause the change of covering slag composition and performance; make its physical property depart from the original performance of covering slag, directly affect the direct motion of continuous casting and the quality of strand.If in covering slag, allocate a certain amount of MnO into, can slow down the reaction of manganese in covering slag and the steel, its performance is stablized.
Tend at present adopt the high alkalinity covering slag both at home and abroad, reach the heat transfer that slows down between continuous casting billet and crystallizer wall by reducing vitreum, thereby reach the purpose that reduces the continuous casting billet longitudinal crack.But covering slag basicity is too high, causes recrystallization temperature high, easily worsens the lubricated of base shell, causes base shell bonding steel leakage.
Summary of the invention
The object of the invention is to provide a kind of control Medium Carbon Steel Containing Manganese, and ([C] is at 0.32～0.38 (wt.%); [Mn] is 1.2～1.6(wt.%)) square blank crystallizer is with containing the low basicity of manganese, low viscosity, the uniform Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag of hot-fluid; its slag has mobile and stable preferably under the condition of high temperature; effectively controlled the uniformity of crystallizer hot-fluid; be applicable to the billet continuous casting production process of efficient stable, the Quality and yield of strand is largely increased.
Covering slag of the present invention forms percentage by weight: Si0
230.0～40.Owt%, CaO13.0～22.3wt%, MgO2.0～7.Owt%, A1
20
33.0～6.0wt%, Fe
2O
31.0～3.0wt%, MnO1.O～4.2wt%, Na
201.2～5.0wt%, F2～7.3wt%, C12～21.3wt%, K
2O≤2.0wt%, Li
20≤1.0wt%, B
2O
3≤ 1.0wt%, TiO
2≤ 0.6wt%, all the other are moisture and inevitable impurity.
Covering slag dual alkalinity (CaO/SiO of the present invention
2) be 0.6 scholar 0.2; Fusion temperature (hemisphere point) is 1208 ± 20 ℃, and setting temperature is 1042 ± 20 ℃, and viscosity is 0.29 ± 0.2Pa.S in the time of 1300 ℃.
The invention has the advantages that the proportioning that in covering slag, has increased MnO, slowed down the reaction of manganese in covering slag and the steel, stablized the covering slag physicochemical property, guaranteed that slag has good lubricated and control strand heat-transfer character, has improved absorption A1
2O
3The ability that is mingled with can be stablized the uniformity of controlling Medium Carbon Steel Containing Manganese square blank crystallizer hot-fluid.Lower basicity makes it have good lubricity, flowability and spreadability.Low viscosity can increase the lower quantity of slag and shorten the slag steel reaction time; reduce it to the impact of covering slag physicochemical property; increased simultaneously the slag film thickness; make strand realize slow cooling; the negative effect that causes to alleviate base shell local stress; both improve lubricant effect, reduced again the generation of crackle, and guaranteed the slag consumption of casting process.Low setting temperature makes slag have preferably stability under the condition of high temperature, can owing to the influence of fluctuations slag layer thickness of crystallizer meniscus place temperature, not guarantee lubricated.
Facts have proved that cast Medium Carbon Steel Containing Manganese continuous casting square billet uses this novel protected slag, the five functional of covering slag is not fully exerted, and continuous casting is produced stable smooth operation, and cc billet surface quality is good.The subordinate list explanation:
The contrast of the slag physicochemical property that produces in the former covering slag of table 1 and its use procedure.
The contrast of the slag physicochemical property that produces in the new slag of table 2 increase MnO proportioning and its use procedure.
The former covering slag of table 1 and the contrast of its slag physicochemical property
The new covering slag of table 2 and the contrast of its slag physicochemical property
The specific embodiment
Embodiment 1:
Present embodiment has specifically been set forth the situation of using continuous casting covering slag of the present invention to produce Medium Carbon Steel Containing Manganese 37Mn5.
The 37Mn5 steel chemical composition of described production is: C0.35wt%, and Si0.16wt%, Mn1.4wt%, P0.025wt%, S0.025wt%, Al0.03wt%, all the other are Fe and inevitable residual impurity.The cast cross dimensions is 280mm * 380mm Medium Carbon Steel Containing Manganese square billet, and pulling rate is controlled at 0.65～0.8m/min.
The described covering slag constituent of present embodiment is: Si0
231.3wt%, CaO21.2wt%, MgO6.25wt%, A1
20
33.981wt%, Fe
2O
32.22wt%, MnO1.55wt%, Na
204.35wt%, F7.3wt%, C18.9wt%, K
2O0.85wt%, Li
200.138wt%, B
2O
30.161 wt%, TiO
20.149wt%, all the other are water and inevitable impurity.Fusion temperature (hemisphere point) is 1208 ℃, and setting temperature is 1042 ℃, and during 1300 ℃ of viscosity, 0.29Pa.S, basicity R are 0.67 covering slag.In the production crystallizer protecting residue and slag thereof are carried out sampling and detected, and carried out comparative analysis with the mold flux property of original use.As seen from Table 1, old slag in use, the MnO growth ratio is larger in the slag, change has occured in its performance, has departed from original value.As seen from Table 2, new slag is owing to increased the MnO proportioning, and the MnO growth ratio is little in the slag, and its physicochemical property changes little, and is substantially close with original value.Whole casting cycle is stable, occurs without bonding steel leakage, and slab quality is good, without Longitudinal Surface Cracks and depression defect.
Embodiment 2:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced Medium Carbon Steel Containing Manganese 37Mn5X.
The 37Mn5X steel chemical composition of described production is: C0.36wt%, and Si0.25wt%, Mn1.45wt%, P0.025wt%, S0.015wt%, Al0.035wt%, all the other are Fe and inevitable residual impurity.The cast cross dimensions is 280mm * 380mm Medium Carbon Steel Containing Manganese square billet, and pulling rate is controlled at 0.7～0.8m/min.
The described covering slag constituent of present embodiment is: Si0
233.4wt%, CaO21.7wt%, MgO5.85wt%, A1
20
33.21wt%, Fe
2O
31.95wt%, MnO1.67wt%, Na
203.75wt%, F6.8wt%, C19.8wt%, K
2O0.65wt%, Li
200.145wt%, B
2O
30.152 wt%, TiO
20.138wt%, all the other are water and inevitable impurity.Fusion temperature (hemisphere point) is 1210 ℃, and setting temperature is 1058 ℃, and during 1300 ℃ of viscosity, 0.31Pa.S, basicity R are 0.65 covering slag.Whole casting cycle is stable, occurs without the bonding steel leakage phenomenon, and slab quality is good, without Longitudinal Surface Cracks and depression defect.
Embodiment 3:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced Medium Carbon Steel Containing Manganese 34Mn6.
The 34Mn6 steel chemical composition of described production is: C0.34wt%, and Si0.28wt%, Mn1.49wt%, P0.025wt%, S0.015wt%, Al0.025wt%, all the other are Fe and inevitable residual impurity.The cast cross dimensions is 280mm * 380mm Medium Carbon Steel Containing Manganese square billet, and pulling rate is controlled at 0.7～0.85m/min.
The described covering slag constituent of present embodiment is: Si0
235.1wt%, CaO22.4wt%, MgO6.12wt%, A1
20
33.42wt%, Fe
2O
32.0wt%, MnO1.58wt%, Na
203.98wt%, F7.2wt%, C19.0wt%, K
2O0.78wt%, Li
200.132wt%, B
2O
30.158 wt%, TiO
20.146wt%, all the other are water and inevitable impurity.Fusion temperature (hemisphere point) is 1207 ℃, and setting temperature is 1055 ℃, and during 1300 ℃ of viscosity, 0.35Pa.S, basicity R are 0.64 covering slag.Whole casting cycle is stable, occurs without the bonding steel leakage phenomenon, and slab quality is good, without Longitudinal Surface Cracks and depression defect.
Claims (3)
1. Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag is characterized in that: covering slag forms percentage by weight and is: Si0
230.0～40.Owt%, CaO13.0～22.3wt%, MgO2.0～7.Owt%, A1
20
33.0～6.0wt%, Fe
2O
31.0～3.0wt%, MnO1.O～4.2wt%, Na
201.2～5.0wt%, F2～7.3wt%, C12～21.3wt%, K
2O≤2.0wt%, Li
20≤1.0wt%, B
2O
3≤ 1.0wt%, TiO
2≤ 0.6wt%, all the other are moisture and inevitable impurity.
2. Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag according to claim 1 is characterized in that: covering slag dual alkalinity (CaO/SiO
2) be 0.6 scholar 0.2.
3. Medium Carbon Steel Containing Manganese continuous crystallizer protecting slag according to claim 1, it is characterized in that: covering slag fusion temperature (hemisphere point) is 1208 ± 20 ℃, and setting temperature is 1042 ± 20 ℃, and viscosity is 0.29 ± 0.2Pa.S in the time of 1300 ℃.
Priority Applications (1)
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|---|---|---|---|
| CN2012105234980A CN103008590A (en) | 2012-12-08 | 2012-12-08 | Continuous casting mold covering slag for medium carbon steel containing manganese |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105234980A CN103008590A (en) | 2012-12-08 | 2012-12-08 | Continuous casting mold covering slag for medium carbon steel containing manganese |
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|---|---|
| CN103008590A true CN103008590A (en) | 2013-04-03 |
Family
ID=47958004
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744380A (en) * | 2012-07-24 | 2012-10-24 | 河南通宇冶材集团有限公司 | Boron-steel-containing mold flux dedicated for continuous casting |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN104607608A (en) * | 2015-01-29 | 2015-05-13 | 中南大学 | Novel medium manganese steel casting powder for automobile and application thereof |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| CN105436447A (en) * | 2016-01-26 | 2016-03-30 | 中南大学 | Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof |
| CN106311998A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Preparation and application method of molten steel covering flux |
| CN106694833A (en) * | 2016-12-28 | 2017-05-24 | 西峡龙成冶金材料有限公司 | Crystallizer covering slag special for CSP thin slab continuous casting medium carbon steel |
| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN110465637A (en) * | 2019-08-13 | 2019-11-19 | 南京钢铁股份有限公司 | A kind of abrasion-resistant stee low alkalinity low-carbon tundish covering flux and its application |
| CN110976798A (en) * | 2019-12-26 | 2020-04-10 | 芜湖新兴铸管有限责任公司 | Continuous casting crystallizer covering slag for medium-high carbon steel |
| CN111974957A (en) * | 2020-07-06 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Continuous casting crystallizer casting powder for medium carbon rare earth steel plate |
| CN113418954A (en) * | 2021-05-21 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Method for judging performance stability of casting powder in casting process of rare earth steel |
| CN113523215A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Process for effectively controlling continuous casting bleed-out of high-manganese steel slab |
| CN115351251A (en) * | 2022-08-23 | 2022-11-18 | 包头钢铁（集团）有限责任公司 | Continuous casting crystallizer covering slag for producing V-containing microalloy rare earth steel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744380A (en) * | 2012-07-24 | 2012-10-24 | 河南通宇冶材集团有限公司 | Boron-steel-containing mold flux dedicated for continuous casting |
| CN102744380B (en) * | 2012-07-24 | 2015-06-24 | 河南通宇冶材集团有限公司 | Boron-steel-containing mold flux dedicated for continuous casting |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN104607608A (en) * | 2015-01-29 | 2015-05-13 | 中南大学 | Novel medium manganese steel casting powder for automobile and application thereof |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| CN106311998A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Preparation and application method of molten steel covering flux |
| CN105436447A (en) * | 2016-01-26 | 2016-03-30 | 中南大学 | Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof |
| CN106694833A (en) * | 2016-12-28 | 2017-05-24 | 西峡龙成冶金材料有限公司 | Crystallizer covering slag special for CSP thin slab continuous casting medium carbon steel |
| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN110465637A (en) * | 2019-08-13 | 2019-11-19 | 南京钢铁股份有限公司 | A kind of abrasion-resistant stee low alkalinity low-carbon tundish covering flux and its application |
| CN110976798A (en) * | 2019-12-26 | 2020-04-10 | 芜湖新兴铸管有限责任公司 | Continuous casting crystallizer covering slag for medium-high carbon steel |
| CN111974957A (en) * | 2020-07-06 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Continuous casting crystallizer casting powder for medium carbon rare earth steel plate |
| CN113418954A (en) * | 2021-05-21 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Method for judging performance stability of casting powder in casting process of rare earth steel |
| CN113523215A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Process for effectively controlling continuous casting bleed-out of high-manganese steel slab |
| CN115351251A (en) * | 2022-08-23 | 2022-11-18 | 包头钢铁（集团）有限责任公司 | Continuous casting crystallizer covering slag for producing V-containing microalloy rare earth steel |
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Application publication date: 20130403 |