CN104259412A - Super-thick slab medium-carbon low-alloy steel continuous casting mold powder and preparation method thereof - Google Patents
Super-thick slab medium-carbon low-alloy steel continuous casting mold powder and preparation method thereof Download PDFInfo
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- CN104259412A CN104259412A CN201410578848.2A CN201410578848A CN104259412A CN 104259412 A CN104259412 A CN 104259412A CN 201410578848 A CN201410578848 A CN 201410578848A CN 104259412 A CN104259412 A CN 104259412A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The invention discloses a super-thick slab medium-carbon low-alloy steel continuous casting mold powder. The super-thick slab medium-carbon low-alloy steel continuous casting mold powder is composed of, by weight part, 6.0-8.0 parts of Na2O, 2.5-4 parts of MgO, 41.0-43.0 parts of CaO, 33.5-35.0 parts of SiO2, 0.0-0.6 part of Fe2O3, 0.0-4.0 parts of Al2O3, 5.5-8.0 parts of F and 4.0-6.0 parts of fixed carbon. According to the super-thick slab medium-carbon low-alloy steel continuous casting mold powder, the mass ratio of CaO and SiO2 is 1.20-1.30, the content of F is 5.5-8.0%, so that surface longitudinal cracks of continuous-cast billets can be effectively prevented; the super-thick slab medium-carbon low-alloy steel continuous casting mold powder has a viscosity of 0.20-0.30 Pa.s at 1300 DEG C, a melting point of 1150-1180 DEG C and a solidification temperature of 1200-1240 DEG C, thereby being capable of reducing the depth of vibration marks, ensuring whole-course lubricity and avoiding surface reticulated cracks and transverse corner cracks.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to continuous casting steel protection slag charge, particularly a kind of extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting and preparation method thereof.
Background technology
Continuous casting covering slag is the key auxiliary material of casting process, and to raising cc billet surface quality, carrying out smoothly of maintenance continuous casting process is significant.The effect of covering slag specifically comprises following several respects: 1, adiabatic heat-insulation prevents heat radiation; 2, separate air, prevent into molten steel oxidation; 3, the field trash in molten steel is absorbed, cleaning molten steel; 4, between crystallizer wall and solidified shell, form lubricating film, reduce resistance of billet withdrawal, prevent the bonding of scull and copper coin; 5, Billet is improved.Common continuous casting covering slag is usually with CaO-SiO
2-Al
2o
3for base-material, add the additives such as a small amount of alkali (soil) metal oxide, fluoride, boride, carbon black, graphite and obtain.
Extra-thick plate blank refers to that thickness is greater than the continuous casting billet of 350mm, and the maximum thickness of strand adopting conticaster to cast both at home and abroad in fact is at present 420mm.Compared with the continuous casting billet of conventional thickness, the thickness of extra-thick plate blank and width all have larger increase, and pulling rate is lower, molten steel in a crystallizer uniformity of temperature profile difficulty strengthens, meniscus surface area heat skewness phenomenon is more outstanding, easily cause nascent thickness of solidified slab shell in secondary uneven, thus produce casting billet surface and subcutaneous mass defect, even cause bonding and bonding steel leakage accident.Therefore; during continuous casting of ultra-thick plate; except adopting rational crystallizer flow field, suitable mode of vibration and using the means such as M-EMS to improve except casting condition, the key quality parameters such as behavior of solidifying, shell growth uniformity that molten steel becomes solid at meniscus surface area from liquid state is then mainly controlled by crystallizer protecting residue.
Medium carbon low alloy steel is mainly used as middle high-strength structure material, and because in steel, carbon content part falls into peritectoid district, its surface longitudinal crack of slab tendency is stronger than mild steel, but more weak than peritectic steel.In addition in these steel owing to adding Al, Nb, V, Ti, B nitride and carbonitride-forming elements, casting billet surface pattern cracking and corner transverse crack more responsive.
Therefore, extra-thick plate blank medium carbon low alloy steel continuous casting covering slag should have certain crystallizing power Heat Transfer Control, also to have higher viscosity and fusion temperature, prevent casting billet surface from generating dark oscillation mark, need that there is suitable setting temperature simultaneously, guarantee that crystallizer whole process obtains melt cinder lubrication, reduce crystallizer middle and lower part strand frictional force; Therefore, need to redesign a kind of Novel continuous casting covering slag, to meet above-mentioned requirements.
China ZL201010586683.5 discloses a kind of continuous casting crystallizer covering slag special for extra-thick slab peritectic steel; its viscosity is at 0.2 ~ 0.3Pas (1300 DEG C); fusion temperature is 1165 ~ 1200 DEG C; although viscosity and fusion temperature suitable; but this covering slag is peritectic steel mould flux; Heat Transfer Control ability is strong, is not suitable for medium carbon low alloy steel continuous casting.China ZL201110235666.1 discloses a kind of medium carbon steel extra-thick plate blank continuous casting covering slag; its basicity is 1.25 ~ 1.26; its viscosity is 0.14 ~ 0.15Pas (1300 DEG C); fusion temperature is 1100 ~ 1130 DEG C; its viscosity and fusion temperature are all on the low side, and under the operating mode of low pulling rate, the consumption of covering slag can be bigger than normal; casting billet surface there will be dark oscillation mark, causes the defects such as surface transverse cracks.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of covering slag being applicable to extra-thick plate blank medium carbon low alloy steel continuous casting.
For achieving the above object, the invention provides following technical scheme:
A kind of extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting, by mass, described protective slag for continuous casting contains following composition: Na
2o:6.0 ~ 8.0 part; MgO:2.5 ~ 4.0 part; CaO:41.0 ~ 43.0 part; SiO
2: 33.5 ~ 35.0 parts; Fe
2o
3: 0.0 ~ 0.6 part; Al
2o
3: 0.0 ~ 4.0 part; F:5.5 ~ 8.0 part; Fixed carbon: 4.0 ~ 6.0 parts.
As preferably of the present invention, the basicity of described protective slag for continuous casting is 1.20 ~ 1.30.
Preferred as another aspect of the present invention, the fusing point of described continuous casting covering slag is 1150 ~ 1180 DEG C, and 1300 DEG C of viscosity are 0.20 ~ 0.30Pa.s, percent crystallization in massecuite 10% ~ 40%, setting temperature 1200 DEG C ~ 1240 DEG C.
The invention also discloses a kind of method preparing described extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting, comprising:
1), lime stone, quartz, wollastonite, magnesia, bauxite, soda ash, lithium carbonate is chosen by proportioning;
2), by step 1) mix after selected raw material are levigate;
3), heating steps 2) mixed powder to molten state;
4), cooling step 3) melt and be crushed to particle diameter and be less than 200 orders;
5), to step 4) powder in add appropriate carbon powder material and mix;
6), to step 5) mixed powder in add solvent and make slurry;
7), spray drying step 6) the finished product of solution.
Beneficial effect of the present invention is:
The present invention first by the basicity of covering slag (with CaO and SiO
2mass ratio meter) be adjusted to 1.20 ~ 1.30, and the mass percentage of F is adjusted to 5.5 ~ 8.0%, now continuous casting covering slag has the degree of crystallinity of 10% ~ 40%, effectively can prevent the generation of medium carbon low alloy steel surface longitudinal crack; Covering slag of the present invention 1300 DEG C of viscositys are 0.20 ~ 0.30Pa.s, fusing point is 1150 ~ 1180 DEG C, can reduce depth of chatter mark under low pulling rate, and it is favourable to suppressing surface transverse cracks and meniscus to solidify the formation of crotch to reduce depth of chatter mark, thus improves cc billet surface quality; The setting temperature of covering slag of the present invention is 1200 DEG C ~ 1240 DEG C, and under can guaranteeing low pulling rate, continuous casting of ultra-thick plate crystallizer whole process obtains melt cinder lubrication, reduces crystallizer middle and lower part strand frictional force, avoids the generation of surface net cracks and corner transverse crack.
Detailed description of the invention
Below the preferred embodiments of the present invention are described in detail.
Embodiment 1:
The present embodiment prepares the method for extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting, comprises the following steps:
1), lime stone, quartz, wollastonite, magnesia, bauxite, soda ash, lithium carbonate is chosen by proportioning;
2), by step 1) mix after selected raw material are levigate;
3), heating steps 2) mixed powder to molten state, make to form complicated solid solution between each material, discharge the volatile matter such as carbonate and moisture simultaneously, obtain burn-off rate faster evenly pre-melt;
4), cooling step 3) melt and crushing grinding to particle diameter is less than 200 orders;
5), according to composition deviation to step 4) powder in add above-mentioned raw materials and finely tune;
6), to step 5) powder in add appropriate carbon powder material and mix;
7), to step 6) mixed powder in add solvent and be configured to solution;
8), spray drying step 7) the finished product of solution.
After testing, the present embodiment gained covering slag composition is as shown in table 1:
The chemical analysis of table 1 embodiment 1 protective slag for continuous casting
| Embodiment | SiO 2 | CaO | Al 2O 3 | MgO | Fe 2O 3 | F - | K 2O+Na 2O | C |
| 1 | 33.61 | 42.47 | 0.84 | 3.71 | 0.43 | 6.11 | 6.51 | 4.3 |
Carry out performance test to this enforcement gained covering slag, result is as shown in table 2:
Table 2 embodiment 1 protective slag for continuous casting main performance index
| Embodiment | CaO/SiO 2 | 1300 DEG C of viscosity (Pa.S) | Fusion temperature (DEG C) | Transition temperature (DEG C) | Crystalline solid ratio |
| 1 | 1.26 | 0.211 | 1152 | 1208 | 35％ |
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, the present embodiment gained covering slag composition is as shown in table 3:
The chemical analysis of table 3 embodiment 2 protective slag for continuous casting
| Embodiment | SiO 2 | CaO | Al 2O 3 | MgO | Fe 2O 3 | F - | K 2O+Na 2O | C |
| 2 | 33.75 | 41.29 | 3.42 | 2.75 | 0.51 | 5.86 | 6.8 | 4.5 |
The present embodiment gained mold flux property is as shown in table 4:
Table 4 embodiment 2 continuous casting covering slag main performance index
| Embodiment | CaO/SiO 2 | 1300 DEG C of viscosity (Pa.S) | Fusion temperature (DEG C) | Transition temperature (DEG C) | Crystalline solid ratio |
| 2 | 1.22 | 0.225 | 1155 | 1234 | 25％ |
The continuous casting covering slag utilizing embodiment 1,2 at home certain steel mill for extra-thick plate blank (thickness 420mm; width 2070mm) medium carbon low alloy steel (its composition is as shown in table 5) continuous casting produce; result shows; in casting cycle, mold liquid level in order; crystallizer hot-fluid is stablized; the original qualification rate of strand all more than 98%, casting billet surface and subcutaneous quality good.
Table 5 is tested with extra-thick plate blank medium carbon low alloy steel composition
| Numbering | C | Si | Mn | P | S | V | Ti | Nb |
| 1 | 0.14～0.17 | 0.15～0.40 | 1.45～1.65 | ≤0.025 | ≤0.015 | 0.02～0.05 | 0.01～0.02 | ≤0.05 |
Note: the composition in upper table 1,3,5 is mass percent.
Therefore, continuous casting covering slag of the present invention both effectively can prevent the generation of special thick Longitudinal Crack On Surface of Casting Slab line, also can avoid the generation of special thick slab surface pattern cracking and corner transverse crack, have higher promotional value.
It should be noted that, when protective slag for continuous casting contains 6.0 ~ 8.0 parts of Na
2o, 2.5 ~ 4.0 parts of MgO, 41.0 ~ 43.0 parts of CaO, 33.5 ~ 35.0 parts of SiO
2, 0.0 ~ 0.6 part of Fe
2o
3, 0.0 ~ 4.0 part of Al
2o
3, 5.5 ~ 8.0 parts of F, all have good result of use during 4.0 ~ 6.0 parts of fixed carbon.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (4)
1. an extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting, is characterized in that: by mass, described protective slag for continuous casting contains following composition: Na
2o:6.0 ~ 8.0 part; MgO:2.5 ~ 4.0 part; CaO:41.0 ~ 43.0 part; SiO
2: 33.5 ~ 35.0 parts; Fe
2o
3: 0.0 ~ 0.6 part; Al
2o
3: 0.0 ~ 4.0 part; F:5.5 ~ 8.0 part; Fixed carbon: 4.0 ~ 6.0 parts.
2. extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting according to claim 1, is characterized in that: the basicity of described protective slag for continuous casting is 1.20 ~ 1.30.
3. extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting according to claim 1; it is characterized in that: the fusing point of described continuous casting covering slag is 1150 ~ 1180 DEG C; 1300 DEG C of viscosity are 0.20 ~ 0.30Pa.s, percent crystallization in massecuite 10% ~ 40%, setting temperature 1200 DEG C ~ 1240 DEG C.
4. prepare a method for extra-thick plate blank medium carbon low alloy steel protective slag for continuous casting as described in claim 1-3 any one, it is characterized in that, comprise the following steps:
1), lime stone, quartz, wollastonite, magnesia, bauxite, soda ash, lithium carbonate is chosen by proportioning;
2), by step 1) mix after selected raw material are levigate;
3), heating steps 2) mixed powder to molten state;
4), cooling step 3) melt and be crushed to particle diameter and be less than 200 orders;
5), to step 4) powder in add appropriate carbon powder material and mix;
6), to step 5) mixed powder in add solvent and make slurry;
7), spray drying step 6) the finished product of solution.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841901A (en) * | 2015-05-11 | 2015-08-19 | 首钢总公司 | Method for improving solidifying ditch on surface of ultra-low carbon steel continuous casting slab |
| 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 |
| CN106077545A (en) * | 2016-07-25 | 2016-11-09 | 西峡县恒基冶材有限公司 | A kind of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting |
| CN106475536A (en) * | 2016-12-30 | 2017-03-08 | 河南省西保冶材集团有限公司 | A kind of P91 jet chimney steel continuous crystallizer protecting slag and preparation method thereof |
| CN107824754A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团西昌钢钒有限公司 | A kind of covering slag for chamfer crystallizer and the steel strand method using chamfer crystallizer |
| CN108723314A (en) * | 2018-07-09 | 2018-11-02 | 西峡龙成冶金材料有限公司 | A kind of chamfer crystallizer low-alloy steel covering slag |
| CN108746533A (en) * | 2018-05-08 | 2018-11-06 | 北京科技大学 | A kind of method of pulse current control continuous crystallizer protecting slag crystallinity |
| JP2020146719A (en) * | 2019-03-13 | 2020-09-17 | 品川リフラクトリーズ株式会社 | Mold powder and method of producing medium-carbon steel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841901A (en) * | 2015-05-11 | 2015-08-19 | 首钢总公司 | Method for improving solidifying ditch on surface of ultra-low carbon steel continuous casting slab |
| 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 |
| CN106077545A (en) * | 2016-07-25 | 2016-11-09 | 西峡县恒基冶材有限公司 | A kind of high carbon abrasion resistant steel crystallizer protecting cinder for continuous casting |
| CN106475536A (en) * | 2016-12-30 | 2017-03-08 | 河南省西保冶材集团有限公司 | A kind of P91 jet chimney steel continuous crystallizer protecting slag and preparation method thereof |
| CN106475536B (en) * | 2016-12-30 | 2018-11-13 | 河南省西保冶材集团有限公司 | A kind of P91 jet chimneys steel continuous crystallizer protecting slag and preparation method thereof |
| CN107824754A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团西昌钢钒有限公司 | A kind of covering slag for chamfer crystallizer and the steel strand method using chamfer crystallizer |
| CN108746533A (en) * | 2018-05-08 | 2018-11-06 | 北京科技大学 | A kind of method of pulse current control continuous crystallizer protecting slag crystallinity |
| CN108723314A (en) * | 2018-07-09 | 2018-11-02 | 西峡龙成冶金材料有限公司 | A kind of chamfer crystallizer low-alloy steel covering slag |
| JP2020146719A (en) * | 2019-03-13 | 2020-09-17 | 品川リフラクトリーズ株式会社 | Mold powder and method of producing medium-carbon steel |
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Application publication date: 20150107 |