CN101204727A - Slim slab low carbon steel special for continuous casting crystallizer protected slag and production processes with same - Google Patents
Slim slab low carbon steel special for continuous casting crystallizer protected slag and production processes with same Download PDFInfo
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- CN101204727A CN101204727A CNA2007101931161A CN200710193116A CN101204727A CN 101204727 A CN101204727 A CN 101204727A CN A2007101931161 A CNA2007101931161 A CN A2007101931161A CN 200710193116 A CN200710193116 A CN 200710193116A CN 101204727 A CN101204727 A CN 101204727A
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Abstract
The invention relates to a metallurgical accessory product used for continuous casting of mild-steel thin sheet slab and relates to a premelting crystallizer covering slag technology specifically used for continuous casting of mild-steel thin sheet slab. The invention comprises premelting materials, fusing agent materials and carbonaceous materials; wherein, the fusing agent materials include Li2CO3, K2CO3, MnCO3 and NaF, etc. The manufacturing technique adopted by the invention includes of gasifying the qualified premelting materials, fusing agent materials and carbonaceous materials into a storage hopper and then carrying through microcomputer material mixing per 6T according to a specific mixture ratio for the covering slag; putting into a mixer for mixing and fetching a semi-finished product for detecting; after qualified, putting into a globe mill for dry milling; putting into an levigator to mill and produce slurry; extracting materials, spraying and granulating; packing and warehousing the qualified products. Compare with import slags, the invention has no cohesion and ingot bleeding and the manufacturing technique anterograde of the invention far exceeds that of the import slag. The invention has the advantages of few slag strips and active reaction as well as small frame in the crystallizer.
Description
Technical field
The present invention relates to field of metallurgy middle low carbon steel slim slab continuous casting metallurgic auxiliary materials product; be specifically related to a kind of slim slab low carbon steel special for continuous casting crystallizer covering slag and production technology thereof, be adapted to the special-purpose pre-melted type crystallized flux technology of slim slab continuous casting (CSP).
Background technology
The continuous casting and rolling of mild steel slim slab is short with its technological process of production, being connected closely of continuous casting and steel rolling process, to greatest extent energy savings, environmental pollution is little, recovery rate of iron is high,, advantage such as technical economic benefit remarkable short from molten steel to the cycle of becoming a useful person, and ferments a new technological change in world's field of metallurgy rapidly.
Unite introduction CSP production technology so far from 98 years domestic Handan Iron and Steel Cos, pearl steel, Baogangs, nearly 5 years, but the advantage of CSP is not able to real embodiment in China.Summary is got up, and following several respects reason is roughly arranged: 1, management (aspects such as production, technology, quality) does not reach requirement; 2, it is long that output reaches the product cycle; As: pearl steel and Baogang up to the present, the single current annual production does not also reach 1,000,000 tons design object; 3, production and material cost are high; 4, product can't meet the quality requirement; 3rd, 4 relatively crucial, also be the important step that the CSP advantage can not demonstrate fully.
By analysis: wherein have an important reasons to be: most of raw material dependence on import, be an immediate cause that causes cost high: wherein preliminary melting type continuous casting crystallizer protecting slag is one of them important aspect.About 2000; the homemade covering slag of part producer is arranged; begin to carry out the research of sheet billet covering slag and applied for patent, though steel mill is being decreased aspect the crystallizer protecting residue cost, the quality of strand (crackle rate, inclusion rates increase greatly) but worse and worse.Thereby this reduces cost to steel mill and the product quality lifting has caused a pair of implacable contradiction.
The characteristics of mild-steel sheet base continuous casting process are: the crystallizer of special shapes such as A, employing and the diverse funnel of conventional mold shape; B, pulling rate height are generally 3～7m/min; Be about conventional sheet billet continuous casting and make 2～5 times of pulling rate; C, high pulling rate cause the interior hot-fluid of crystallizer bigger, cause the probability of casting billet surface fire check to increase; D, the mouth of a river are flat, have caused mouth of a river steel stream flow velocity very big, and simultaneously, the liquid fluctuating aggravation very easily causes the volume slag in the crystallizer, causes the surperficial inclusion rates of strand to increase; E, the molten steel time of staying in crystallizer shortens, and the slag consumption sharply descends, thereby causes the insufficient lubrication of strand, and frictional force increases, and very easily draws bonding steel leakage.
At above reason, want to guarantee the good slab quality and the continuous casting process of direct motion, must aspect these two of covering slags, do further research and inquirement work stretching into the formula mouth of a river and crystallization.
Mild-steel sheet base continuous casting process develops so far recent two decades, and the mouth of a river is a kind of technology of comparative maturity, so the key of dealing with problems provides a kind of rational continuous crystallizer protecting slag.
At present, the import mild-steel sheet blank continuous casting crystallizer covering slag that uses of China Metallurgica (pearl steel) and Strollberg (Handan Iron and Steel Co and Baogang) two companies that are mainly Germany produce.The characteristics of its covering slag are: basicity is between 0.85～1.00; Fusing point is at 1080～1120 ℃; Viscosity is at 0.10～0.15pa.s (1300 ℃); Crystallization temperature is at 1120～1160 ℃.In use, slab quality is better.But, also have certain gap, so the import slag has been subjected to certain restriction in the use of China because the continuous casting operant level of China is compared with foreign country with the process management present situation.
Summary of the invention
The objective of the invention is to provide under the existing bar strip continuous casting process conditions of a kind of adaptation China not only reduce cost but also can satisfy that product quality requires, greasy property is good, surface tension is big between the slag steel (is difficult for causing that the slag steel reinforced concrete is assorted; cause slag inclusion), suitable crystallization temperature (delaying to conduct heat), reduce the crystallizer for continuous casting of thin slabs covering slag of hot cracking tendency.
Mild-steel sheet base privacy protection slag of the present invention is made up of base-material (pre-melt), flux material, carbonaceous material, and their percentage by weight is respectively: pre-melt 80-90, flux material 8-15, carbonaceous material 2-6; Wherein flux material includes Li
2CO
3, K
2CO
3, MnCO
3And NaF, described Li
2CO
3, K
2CO
3, MnCO
3Be respectively 2.5-7.4%, 0.73-4.4%, 1.6-8.1%, 4.0-8.0% with the percentage by weight of NaF in covering slag.
The production technology that the present invention takes comprises the two large divisions:
Wherein production process of pre-molten material is as follows: various qualified raw material silicon lime stones, fluorite, lime stone and glass blocks are crushed to designated size, various then raw material were in 3: 2: 2: 3 ratio mixing, carry out batching, go into the stove fritting by the every work of 500kg, carry out shrend after coming out of the stove immediately, after the air-dry or oven dry, the layering of falling the raft is tiled again, abrasive material to 300 order all-pass mistake is directly got in tiling, and the fritting feed bin is gone in gasification then;
Mild-steel sheet base privacy protection slag production technology is as follows: qualified base-material (pre-melt), flux material, carbonaceous material are gasified into feed bin; then according to the described proportioning of mild-steel sheet base privacy protection slag; carry out Microcomputerized dosing by the every work of 6T, reenter mixer and stir, get semi-finished product and detect; treat qualified after; go into the ball mill dry grinding, go into the levigate and pulping of levigator, carry the material mist projection granulating; product detects, certified products packing warehouse-in.
The present invention finds one to be adapted to slim slab continuous crystallizer protecting slag theory and practice foundation under the existing condition of China according to existing continuous casting operant level of China and process management present situation.Thus, the present invention proposes a following sheet billet privacy protection slag and design a model: lower fusing point, the hemisphere point control is at 1060 ± 20 ℃ usually; Lower viscosity, in order to ensure suitable slag consumption, viscosity is controlled at 0.13 ± 0.05pa.s, 1300 ℃ usually; Medium recrystallization temperature and lower crystallization rate, general recrystallization temperature is controlled at 1120 ± 20; Bigger slag interface tension force; Usually interfacial tension is controlled at greater than 280 dyne.
The flux that conventional slab continuous casting crystallizer protection slag adopts is: Na
2CO
3And CaF
2The class material, for the crystallizer for continuous casting of thin slabs covering slag, its fusing point relative with viscosity will be low many, if all adopt Na
2CO
3And CaF
2The class material is made flux, its large usage quantity.And higher Na
2CO
3And CaF
2Can cause high-melting-point nepheline (Na respectively
2OAl
2O
3, 2SiO
2) and cuspidine (3CaO2SiO
2CaF
2) separate out, this crystalloid crystal grain is thicker, fusing point is higher, certainly will cause in the crystallizer greasy property of strand bad, easily causes bonding steel leakage; Simultaneously owing to contain Na
2CO
3The class material belongs to surface reactive material, and it adds affiliation in a large number and reduces slag interface tension force, causes dry slag; So for the crystallizer for continuous casting of thin slabs covering slag, limes reacting dose adds and contains Na
2O class material.Simultaneously, it is crucial seeking new flux.
K
2O and Na
2O belongs to same major element, also belongs to network outer body, but owing to its ion half-sum is played greater than Na
+So it loses O
2-Than Na
+Easier.Simultaneously, K
2The O fusing point is than Ns
2O is slightly high, considers that from reducing viscosity and branch fusibleness angle we select to contain K
2O class material is as a kind of flux, and its conventional amount used is 0.5～3%.
Li
2O and Na, K belong to same major element, and its ionic radius is less, and theoretically, its ability that loses negative oxygen ion will be far smaller than Na, K, but through overtesting, find Li
2O will be far longer than Na in the ability aspect reduction fusing point and the viscosity
2O and K
2O, warp is to containing Li
2The O slag carries out the ion structural analysis, finds that its ion that destroys Si-O is not O
2, but Li
2O, it reduces, and the bigger reason of fusing point amplitude is main hangs down relevant with himself fusing point.
Because Li
+Ionic radius is little, and a little less than the extranuclear electron row power, the steric hindrance that ion moves is very little, so contain Li
2The bits of O contain lithium class mineral in cooling procedure very easily recombinates, and crystallization tendency is bigger.Useful to the control fire check.We are by the differential thermal analyzer analysis simultaneously, and its crystallization occurs in 1000 ℃, thereby do not influence liquid lubricated.
Though Li
2The fusing point of O own is not high yet, but finds the Li of every increase by 1% through overtesting
2O, the fusing point of bits reduce about 55～65 ℃, and viscosity reduces about 0.28～0.35 pool, so in slag, Li
2O content is quite low, and its influence to bits branch fusibleness can be ignored substantially.Therefore, we adopt this material, and its conventional amount used is 1～3%.
Through overtesting, find that the material that contains MnO has following characteristic: the effect to reduction fusing point and viscosity is also very remarkable; It is a kind of basic anhydride, and is also very effective to physical and chemical performance and the heat endurance of stablizing bits; The own slag film of bits that contains MnO is brownish red, and transmission has certain refraction action to heat, thereby has slackened the heat flow density of crystallizer, is beneficial to control and conducts heat; The bits that contain MnO are to exist with thin crystalline form when crystallization, and just in time satisfying ultra-thin plate continuous casting crystallizer protecting residue promptly has lubricity preferably, can suppress again to conduct heat; So is more rational with MnO as a kind of flux material, its conventional amount used is 1～5%.
The continuous-casting crystallizer especially used covering slag of the ultra-thin plate of mild steel adopts special-purpose pre-melt, and its composition approaches finishing slag substantially, and conventional its proportioning is 70～90%, and is evenly very favourable to the fusing that guarantees bits.
Through the analysis of front,, determine the physical and chemical index such as the following table of the continuous-casting crystallizer especially used covering slag of mild-steel sheet base in conjunction with the not enough of homemade slag and import slag and our determined material:
Chemical index composition scope (%)
CaO/SiO
2 0.93±0.06
CaO 26～33
SiO
2 28～35
Fe
2O
3 ≤1.5
MgO 3～6
Al
2O
3 3～6
R
2O 9～12
F
+ 4～7
MnO 1～4
Physical index
H2O ≤0.5
Tm(℃) 1060±20
Viscosity (1300 ° of PaS) 0.14 ± 0.05
Remarks: 1, CaO/SiO
2Be dual alkalinity; 2, R
2O=Na
2O+K
2O+Li
2O; 3, Tm representative: hemisphere point temperature; 4, Rp represents the crystallization rate.
Trial target of the present invention is chosen in steel mills such as Lianyuan and Tangshan and tests, and at first in the Lianyuan test, through on probation, effect is as follows:
1 compares with the import slag, does not have bonding steel leakage one time, and the fairness of its production technology is considerably beyond the import slag;
2, the product percent of pass of whole process of production (the main finger because of not having crackle and defective such as being mingled with) is compared with German slag with homemade slag, is respectively: test product of the present invention: 96.2%; Homemade slag: 85.3%; Germany: 94.6%;
3, reflection in the crystallizer: my the slag bar of company's product is few, and reflection enlivens in the crystallizer, and flame is suitable.
The specific embodiment
Mild-steel sheet base privacy protection slag of the present invention is made up of base-material (pre-melt), flux material, carbonaceous material, and their percentage by weight is respectively: pre-melt 80-90, flux material 8-15, carbonaceous material 2-6; Wherein flux material includes Li
2CO
3, K
2CO
3, MnCO
3And NaF, described Li
2CO
3, K
2CO
3, MnCO
3Be respectively 2.5-7.4%, 0.73-4.4%, 1.6-8.1%, 4.0-8.0% with the percentage by weight of NaF in covering slag.
The production technology that the present invention takes comprises the two large divisions:
Wherein production process of pre-molten material is as follows: various qualified raw material silicon lime stones, fluorite, lime stone and glass blocks are crushed to designated size, various then raw material were in 3: 2: 2: 3 ratio mixing, carry out batching, go into the stove fritting by the every work of 500kg, carry out shrend after coming out of the stove immediately, after the air-dry or oven dry, the layering of falling the raft is tiled again, abrasive material to 300 order all-pass mistake is directly got in tiling, and the fritting feed bin is gone in gasification then;
Mild-steel sheet base privacy protection slag production technology is as follows: qualified base-material (pre-melt), flux material, carbonaceous material are gasified into feed bin; then according to the described proportioning of mild-steel sheet base privacy protection slag; carry out Microcomputerized dosing by the every work of 6T, reenter mixer and stir, get semi-finished product and detect; treat qualified after; go into the ball mill dry grinding, go into the levigate and pulping of levigator, carry the material mist projection granulating; product detects, certified products packing warehouse-in.
Claims (2)
1. slim slab low carbon steel special for continuous casting crystallizer covering slag is characterized in that this covering slag is made up of pre-melt, flux material, carbonaceous material, and their percentage by weight is respectively: pre-melt 80-90, flux material 8-15, carbonaceous material 2-6; Wherein flux material includes Li
2CO
3, K
2CO
3, MnCO
3And NaF, described Li
2CO
3, K
2CO
3, MnCO
3Be respectively 2.5-7.4%, 0.73-4.4%, 1.6-8.1%, 4.0-8.0% with the percentage by weight of NaF in covering slag.
2. production technology of slim slab low carbon steel special for continuous casting crystallizer covering slag according to claim 1, this production technology comprises the two large divisions:
Wherein production process of pre-molten material is as follows: various qualified raw material silicon lime stones, fluorite, lime stone and glass blocks are crushed to designated size, various then raw material were in 3: 2: 2: 3 ratio mixing, carry out batching, go into the stove fritting by the every work of 500kg, carry out shrend after coming out of the stove immediately, after the air-dry or oven dry, the layering of falling the raft is tiled again, abrasive material to 300 order all-pass mistake is directly got in tiling, and the fritting feed bin is gone in gasification then;
Mild-steel sheet base privacy protection slag production technology is as follows: qualified pre-melt, flux material, carbonaceous material are gasified into feed bin; then according to the described proportioning of mild-steel sheet base privacy protection slag; carry out Microcomputerized dosing by the every work of 6T, reenter mixer and stir, get semi-finished product and detect; treat qualified after; go into the ball mill dry grinding, go into the levigate and pulping of levigator, carry the material mist projection granulating; product detects, certified products packing warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101931161A CN101204727A (en) | 2007-11-30 | 2007-11-30 | Slim slab low carbon steel special for continuous casting crystallizer protected slag and production processes with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101931161A CN101204727A (en) | 2007-11-30 | 2007-11-30 | Slim slab low carbon steel special for continuous casting crystallizer protected slag and production processes with same |
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733371A (en) * | 2010-01-21 | 2010-06-16 | 河南省西保冶材集团有限公司 | Function protective materials for oblong taperless steel ingots |
| CN102019384A (en) * | 2010-12-08 | 2011-04-20 | 西峡龙成冶金材料有限公司 | High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel |
| CN101637812B (en) * | 2009-08-11 | 2012-05-09 | 河南省西保冶材集团有限公司 | Small plate blank continuous casting functional protective material |
| CN102873293A (en) * | 2012-09-25 | 2013-01-16 | 南京钢铁股份有限公司 | Continuous casting process for cold forging steel for low carbon boron-containing standard components |
| CN106623831A (en) * | 2016-12-27 | 2017-05-10 | 华北理工大学 | Preparation method of high-iron-content continuous casting mold fluxes for laboratory |
| CN108393449A (en) * | 2018-03-30 | 2018-08-14 | 江苏新亿源环保科技有限公司 | A kind of mild steel continuous casting covering slag and preparation method thereof |
| CN108838355A (en) * | 2018-07-09 | 2018-11-20 | 西峡龙成冶金材料有限公司 | A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon |
| CN110605365A (en) * | 2019-09-29 | 2019-12-24 | 河南通宇冶材集团有限公司 | Manganese-containing pre-melted material, casting powder containing pre-melted material and application of casting powder |
-
2007
- 2007-11-30 CN CNA2007101931161A patent/CN101204727A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101637812B (en) * | 2009-08-11 | 2012-05-09 | 河南省西保冶材集团有限公司 | Small plate blank continuous casting functional protective material |
| CN101733371A (en) * | 2010-01-21 | 2010-06-16 | 河南省西保冶材集团有限公司 | Function protective materials for oblong taperless steel ingots |
| CN101733371B (en) * | 2010-01-21 | 2013-06-26 | 河南省西保冶材集团有限公司 | Function protective materials for oblong taperless steel ingots |
| CN102019384B (en) * | 2010-12-08 | 2013-11-20 | 西峡龙成冶金材料有限公司 | High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel |
| CN102019384A (en) * | 2010-12-08 | 2011-04-20 | 西峡龙成冶金材料有限公司 | High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel |
| CN102873293B (en) * | 2012-09-25 | 2014-11-26 | 南京钢铁股份有限公司 | Continuous casting process for cold forging steel for low carbon boron-containing standard components |
| CN102873293A (en) * | 2012-09-25 | 2013-01-16 | 南京钢铁股份有限公司 | Continuous casting process for cold forging steel for low carbon boron-containing standard components |
| CN106623831A (en) * | 2016-12-27 | 2017-05-10 | 华北理工大学 | Preparation method of high-iron-content continuous casting mold fluxes for laboratory |
| CN106623831B (en) * | 2016-12-27 | 2018-09-04 | 华北理工大学 | A kind of preparation method of use for laboratory high Fe content continuous casting covering slag |
| CN108393449A (en) * | 2018-03-30 | 2018-08-14 | 江苏新亿源环保科技有限公司 | A kind of mild steel continuous casting covering slag and preparation method thereof |
| CN108838355A (en) * | 2018-07-09 | 2018-11-20 | 西峡龙成冶金材料有限公司 | A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon |
| CN110605365A (en) * | 2019-09-29 | 2019-12-24 | 河南通宇冶材集团有限公司 | Manganese-containing pre-melted material, casting powder containing pre-melted material and application of casting powder |
| CN110605365B (en) * | 2019-09-29 | 2021-06-01 | 河南通宇冶材集团有限公司 | Manganese-containing pre-melted material, casting powder containing pre-melted material and application of casting powder |
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Open date: 20080625 |