CN102000795A - Protective slag special for continuous casting of high-sulfur steel - Google Patents
Protective slag special for continuous casting of high-sulfur steel Download PDFInfo
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- CN102000795A CN102000795A CN 201010580953 CN201010580953A CN102000795A CN 102000795 A CN102000795 A CN 102000795A CN 201010580953 CN201010580953 CN 201010580953 CN 201010580953 A CN201010580953 A CN 201010580953A CN 102000795 A CN102000795 A CN 102000795A
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Abstract
The invention relates to protective slag special for the continuous casting of high-sulfur steel, belongs to the technical field of metallurgical steelmaking, which is used for solving the problem of subsurface cracks caused by the longitudinal sinking of a high-sulfur steel casting blank. The protective slag is characterized by comprising the following chemical components in percentage by weight: 23.0 to 29.0 percent of SiO2, less than or equal to 6.0 percent of MgO, 20.5 to 26.5 percent of CaO, less than or equal to 3.0 percent of Fe2O3, 9.5 to 13.5 percent of Al2O3, 2.0 to 6.0 percent of MnO, 8.0 to 12.0 percent of R2O, 0.3 to 4.3 percent of F<->, and 10.0 to 14.0 percent of C. When the protective slag is used for producing the high-sulfur steel, a crystallizer has an active liquid level and uniformly melts steel; through observation of a surface sample of the casting blank subjected to acid washing, the surface is smooth and not sunk, and surface cracks do not exist; and macroscopic quality is high, and the subsurface cracks and intermediate cracks do not exist through tests.
Description
Technical field
The present invention relates to a kind of crystallizer protecting cinder for continuous casting, especially relate to the crystallizer guarantor sulphur steel continuous casting privacy protection slag that the subcutaneous quality of sulphur steel continuous casting side's (square) base is protected in a kind of improvement, belong to metallurgical steelmaking technical field.
Background technology
Because cold short, the hot-short effect of sulphur all is as harmful element in the steel generally speaking, in smelting process, reduce its content of control as far as possible.In particular cases, in order to improve the cutting ability of steel, the sulfur content in the steel can suitably improve, and promptly is referred to as to protect the sulphur steel.In steel, add a certain amount of sulphur when protecting the sulphur steel by smelting, because [S] content height in the steel, and [S] content poly-partially between dendrite may be higher, make that the elevated temperature strength and the plasticity of steel are all very low, in casting process, crackle (subcrack) just appears in solidified shell easily under ferrostatic pressure and the effect of surface cool shrinkage stress like this.Avoid the generation of above-mentioned subcrack; the most basic measure is to avoid strand to form corner portion in crystallizer vertically to cave in; and improvement crystallizer protecting residue proportioning; suitably improving basicity, fusing point and the viscosity of covering slag, is to reach the effective measures of eliminating the casting billet surface longitudinal depression, solving the strand subcrack.
Summary of the invention
Technical problem to be solved by this invention provides a kind of guarantor's sulphur steel continuous casting privacy protection slag of eliminating continuous casting billet subcrack and surface detail crackle.
The alleged problem of the present invention is solved by following technical scheme:
A kind of guarantor's sulphur steel continuous casting privacy protection slag, special feature is: described covering slag chemical component weight percentage is as follows:
SiO2?23.0-29.0，MgO?≤6.0，CaO?20.5-26.5，Fe2O3?≤3.0，Al2O3?9.5-13.5，MnO?2.0-6.0，R2O?8.0-12.0，F- 0.3-4.3，C?10.0-14.0。
Above-mentioned guarantor's sulphur steel continuous casting privacy protection slag; described covering slag physicochemical property is as follows: basicity 0.90 ± 0.1; 1120 ± 30 ℃ of fusion points; 1350 ℃ of molten speed 40 ± 20 S; 1300 ℃ of viscosity 0.80 ± 0.15 PaS; granularity (0.5-1mm) 〉=90%, unit weight 0.7 ± 0.1 g/cm3, physics H2O≤0.5%.
The present invention is directed to solve and protect the subcrack problem of sulphur steel strand, a kind of guarantor's sulphur steel continuous casting privacy protection slag is provided because of vertically caving in and produce.This covering slag is by selected raw material; optimize its chemical composition proportioning and physical and chemical index; under the prerequisite that does not produce slab surface crack; keep higher basicity, fusing point and viscosity; the weak cold-peace that reaches the crystallizer meniscus surface area guarantees the balance of strand between lubricated; both guarantee not occur strand depression and subcrack, and can control the generation of casting billet surface fine cracks again.Test shows that covering slag of the present invention is used for producing when protecting the sulphur steel, and mold liquid level is active, and fusing evenly; Get the pickling of casting billet surface sample and observe, surfacing does not have depression, no face crack; Low multiple quality is good, checks no subcutaneous and middle crack.
The specific embodiment
The sulfur content scope of guarantor's sulphur steel of the present invention is 0.035%wt ~ 0.15%wt.Because [S] content height in the steel makes that the elevated temperature strength of steel and plasticity are all very low, this is the main cause that subcrack occurs.In continuous casting process, improve covering slag basicity, fusing point and viscosity, can increase the crystalline solid ratio in solid slag film thickness or the slag film, thereby weaken the heat flow density of meniscus surface area, make initial solidification shell thinner more even; Particularly the high-viscosity covering slag slag is unlikely too much to the gathering of corner portion under crystallizer molten steel backflow effect, can alleviate the strand depression like this.But the crystallinity of high basicity and high-melting-point covering slag is strong, solid slag thickness and the melt cinder film is thin, and the lubricant effect of strand is weakened, and strand will be subjected to bigger frictional resistance in crystallizer.For protecting the sulphur steel,, when frictional resistance is big, can produce fine cracks or micro-crack equally because of the elevated temperature strength of high [S] content casting billet surface is very low.Based on above-mentioned factor, produce to protect the sulphur steel and need seek the weak cold-peace of crystallizer meniscus surface area and guarantee the balance of strand between lubricated, both guaranteed not occur strand depression and subcrack, can control the generation of casting billet surface fine cracks again.Covering slag of the present invention is exactly specialized designs in order to reach above purpose; its mentality of designing is: at protecting the subcrack outstanding situation of sulphur steel strand because of vertically depression generation; under the prerequisite that does not produce slab surface crack, keep higher basicity, fusing point and viscosity.
Described covering slag chemical component weight percentage is as follows: SiO2 23.0-29.0, MgO≤6.0, CaO 20.5-26.5, Fe2O3≤3.0, Al2O3 9.5-13.5, MnO 2.0-6.0, R2O 8.0-12.0, F-0.3-4.3, C 10.0-14.0.
Described covering slag voltinism can be as follows: basicity 0.90 ± 0.1,1120 ± 30 ℃ of fusion points, 1350 ℃ of molten speed 40 ± 20 S, 1300 ℃ of viscosity 0.80 ± 0.15 PaS, granularity (0.5-1mm) 〉=90%, unit weight 0.7 ± 0.1 g/cm3, physics H2O≤0.5%.
Described covering slag is made up of the raw material of following weight unit's: soda ash 10-14, in super carbon black 2-3, semi-reinforcing hydrocarbon black 3-5, amorphous graphite 8-12; sodium fluoride 4-6, wollastonite 44-48, sodium carboxymethylcellulose 1-3; calcite 1-3, magnesia 2-4, bauxite 12-16.Above-mentioned raw materials through be mixed, pulverize, conventional method such as oven dry, granulation makes the present invention and protects sulphur steel continuous casting privacy protection slag.
Below provide embodiment.
Embodiment 1: square billet continuous casting machine section 300*360, produce steel grade 50MnVS, and its main chemistry (melting) composition sees the following form:
Take by weighing raw material by proportioning, sulphur steel continuous casting privacy protection slag is protected in preparation, its chemical composition of described covering slag and physical and chemical index such as following table:
(annotate: go up chemical composition+physics H in the table
2The O mass fraction adds up to 98.5%, and all the other 1.5% are impurity.）
Observe continuous cast mold liquid level situation in the steel pouring process, mold liquid level is active, and fusing is evenly measured liquid slag layer thickness 8-10mm, covering slag consumption 0.30-0.35kg/t; Get the pickling of casting billet surface sample and observe, surfacing does not have depression, no face crack; Low multiple quality is good, checks no subcutaneous and middle crack.
Embodiment 2: square billet continuous casting machine section 220*300, produce steel grade SAE1141, and its main chemistry (melting) composition sees the following form:
Take by weighing raw material by proportioning, sulphur steel continuous casting privacy protection slag is protected in preparation, its chemical composition of described covering slag and physical and chemical index such as following table:
(annotate: go up chemical composition+physics H in the table
2The O mass fraction adds up to 98.3%, and all the other 1.7% are impurity)
Observe continuous cast mold liquid level situation in the steel pouring process, mold liquid level is active, and fusing is evenly measured liquid slag layer thickness 7-8mm, covering slag consumption 0.20-0.25kg/t; Get the pickling of casting billet surface sample and observe, surfacing does not have depression, no face crack; Low multiple quality is good, and check is not found subcutaneous and middle crack.
Embodiment 3: billet caster section 150*150, produce steel grade YF45MnV, and its main chemistry (melting) composition sees the following form:
Take by weighing raw material by proportioning, sulphur steel continuous casting privacy protection slag is protected in preparation, its chemical composition of described covering slag and physical and chemical index such as following table:
(annotate: go up chemical composition+physics H in the table
2O adds up to 98.2%, and all the other 1.8% are impurity)
Observe continuous cast mold liquid level situation in the steel pouring process, mold liquid level is active, and fusing is evenly measured liquid slag layer thickness 7-8mm, covering slag consumption 0.20-0.25kg/t; Get the pickling of casting billet surface sample and observe, surfacing does not have depression, no face crack; Low multiple quality is good, and check is not found subcutaneous and middle crack.
Claims (2)
1. protect sulphur steel continuous casting privacy protection slag for one kind, it is characterized in that: described covering slag chemical component weight percentage is as follows:
SiO2?23.0-29.0，MgO?≤6.0，CaO?20.5-26.5，Fe2O3?≤3.0，Al2O3?9.5-13.5，MnO?2.0-6.0，R2O?8.0-12.0，F- 0.3-4.3，C?10.0-14.0。
2. guarantor's sulphur steel continuous casting privacy protection slag according to claim 1; it is characterized in that: described covering slag physicochemical property is as follows: basicity 0.90 ± 0.1; 1120 ± 30 ℃ of fusion points; 1350 ℃ of molten speed 40 ± 20 S; 1300 ℃ of viscosity 0.80 ± 0.15 PaS; granularity (0.5-1mm) 〉=90%, unit weight 0.7 ± 0.1 g/cm3, physics H2O≤0.5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010580953 CN102000795A (en) | 2010-12-09 | 2010-12-09 | Protective slag special for continuous casting of high-sulfur steel |
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| CN 201010580953 CN102000795A (en) | 2010-12-09 | 2010-12-09 | Protective slag special for continuous casting of high-sulfur steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325103A (en) * | 2014-11-25 | 2015-02-04 | 山东钢铁股份有限公司 | Protective casting method for feeding steel strips into crystallizer |
| CN105344956A (en) * | 2015-12-18 | 2016-02-24 | 河南省西保冶材集团有限公司 | Special continuous casting crystallizer function protecting material for sulfur free-cutting steel and preparation method thereof |
| 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 |
| CN114130973A (en) * | 2021-12-13 | 2022-03-04 | 芜湖新兴铸管有限责任公司 | Special mold flux for crystallizer for inland natural service environment resistant corrosion-resistant steel bar and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN101658907A (en) * | 2009-09-16 | 2010-03-03 | 河南通宇冶材集团有限公司 | Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same |
-
2010
- 2010-12-09 CN CN 201010580953 patent/CN102000795A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN101658907A (en) * | 2009-09-16 | 2010-03-03 | 河南通宇冶材集团有限公司 | Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325103A (en) * | 2014-11-25 | 2015-02-04 | 山东钢铁股份有限公司 | Protective casting method for feeding steel strips into crystallizer |
| CN104325103B (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 |
| CN105344956A (en) * | 2015-12-18 | 2016-02-24 | 河南省西保冶材集团有限公司 | Special continuous casting crystallizer function protecting material for sulfur free-cutting steel and preparation method thereof |
| 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 |
| CN114130973A (en) * | 2021-12-13 | 2022-03-04 | 芜湖新兴铸管有限责任公司 | Special mold flux for crystallizer for inland natural service environment resistant corrosion-resistant steel bar and preparation method and application thereof |
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Application publication date: 20110406 |