CN102773438A - Slag powder of continuous casting and rolling sheet billet low-carbon steel crystallizer - Google Patents

Slag powder of continuous casting and rolling sheet billet low-carbon steel crystallizer Download PDF

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Publication number
CN102773438A
CN102773438A CN2012102593002A CN201210259300A CN102773438A CN 102773438 A CN102773438 A CN 102773438A CN 2012102593002 A CN2012102593002 A CN 2012102593002A CN 201210259300 A CN201210259300 A CN 201210259300A CN 102773438 A CN102773438 A CN 102773438A
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China
Prior art keywords
continuous casting
carbon steel
sheet billet
rolling sheet
low carbon
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Pending
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CN2012102593002A
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Chinese (zh)
Inventor
杨玉兵
彭锴
彭武伟
翟胜辉
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Luoyang Branch Metallurgical New Material (group) Co Ltd
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Luoyang Branch Metallurgical New Material (group) Co Ltd
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Priority to CN2012102593002A priority Critical patent/CN102773438A/en
Publication of CN102773438A publication Critical patent/CN102773438A/en
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Abstract

The invention discloses slag powder of a continuous casting and rolling sheet billet low-carbon steel crystallizer. Raw material components and corresponding weight percentage of the slag powder are as follows: 40-50% of wollastonite, 10-15% of fluorite, 3-5% of sodium fluoride, 10-15% of soda ash, 10-15% of silicon powder, 5-12% of cryolite, 3-4% of super furnace black, 1-2% of semi-reinforced furnace black, 2-3% of lithium carbonate and 2-5% of hydroxymethyl cellulose. The slag powder is low in melting point, fast in powder forming, even in smelting, good in lubrication effect, low in bleed-out rate and few in cracks.

Description

Continuous casting and rolling sheet billet low carbon steel crystallizer protective slag
Technical field
The invention belongs to the thin plate blank continuously casting and continuously rolling technology field, what relate generally to is a kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag.
Background technology
Covering slag is the slag charge that in the molten steel casting process, on the molten steel surface of crystallizer wall, constantly adds.It has the effect of five aspects, that is: adiabatic heat-insulation prevents that heat radiation, secluding air from preventing that secondary oxidation of steel, absorption are mingled with purify hot metal, lubricated strand, the heat transfer of crystallization control device.
The CSP crystallizer protecting residue is very important a kind of material in the whole production line production technology, and its stability and product quality to production process has decisive influence.Simultaneously, different steel grades, different process also is not quite similar to the requirement of covering slag, and characteristics such as thin-slab caster is fast owing to pulling rate, liquid fluctuating big, the molten bath area is little, bleed-out coefficient height are also had higher requirement to covering slag.At present, domestic continuous casting and rolling sheet billet low carbon steel crystallizer protective slag mainly leans on import, the thin-slab caster thinner thickness that domestic each big steel mill uses, thickness only 70mm～90mm (thickness of slab caster is 150mm～300mm); Pulling rate is high, and pulling rate is that (the slab pulling rate≤2.5m), therefore, the import covering slag is found in use: 1) indivedual heat slag bars are bigger than normal for 4.2m～6.5m; Casting mild steel is when carbon content is 0.65%, and lobe and bonding steel leakage situation take place to be increased; 2) consumption is less than normal; When 3) composition or variations in temperature were big between heat, the hot-fluid change was bigger; 4) in addition, because the long-term import covering slag that uses causes cost high, procurement cycle is long, has brought very big pressure for supply, production and sales.
Summary of the invention
In order to solve the deficiency that exists in the prior art, the object of the invention proposes a kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag.
In order to realize the foregoing invention purpose, the present invention adopts the technical scheme that is described below:
A kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag, each constituent of the raw material of this covering slag and weight percentage are: wollastonite 40～50%, fluorite powder 10～15%, sodium fluoride 3～5%, soda ash 10～15%, Cab-O-sil 10～15%, ice crystal 5～12%, in ultra carbon black 3～4%, semi-reinforcing hydrocarbon black 1～2%, lithium carbonate 2～3%, CMC 2～5%.
Wherein, each composition percentage composition is in the wollastonite: CaO:46 ± 2%, SiO 2: 50 ± 2%, Fe 2O 3≤1%, MgO :≤1%, burn and lose≤2.5%, moisture content≤0.5%, granularity 325 orders.
CaF in the fluorite powder 2Content>=95%, and fluorite powder degree is 200 order all-pass mistakes.
In content >=95% of C in the ultra carbon black.
The content of C >=97% in the semi-reinforcing hydrocarbon black.
SiO in the Cab-O-sil 2Content>=98%, granularity is 200 order all-pass mistakes.
Chemical composition in the described covering slag and weight percentage thereof are: SiO 2 :32%～34%, CaO:32～34%, AL 2O 3 : 2%～4%, MgO: Fe≤1%, 2O 3≤1%, F -: K2O+Na 6%～8%, 2O+Li 2O:8%～10%, C:5%～7%.
Dual alkalinity (the CaO/SiO of covering slag of the present invention 2) be 1.04 ± 0.05; 1300 ℃ viscosity is 0.15 ± 0.09Pa ﹒ s; Fusing point is 1070 ± 30 ℃.
Because adopt technique scheme, the present invention has following superiority:
1, fusing point is low, and slagging speed is fast, and fusing evenly;
2, high insulating effect, spreadability is good;
3, viscosity is low, and consumption is moderate;
4, the slag film is even, and hot-fluid is stable;
5, high lubricating effect, breakout ratio is low, and crackle is few.
The specific embodiment
Through embodiment the present invention is done further detailed description below.
Embodiment 1
A kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag, the raw material of this covering slag is formed and weight percentage is: wollastonite 40%, fluorite powder 10%, soda ash 10%, Cab-O-sil 15%, ice crystal 11%, sodium fluoride 3%, in ultra carbon black 3%, semi-reinforcing hydrocarbon black 1%, lithium carbonate 2%, CMC: 5%.
Wherein, each composition and weight percentage thereof are in the wollastonite: CaO:46 ± 2%, SiO 2: 50 ± 2%, Fe 2O 3≤1%, MgO :≤1%, burn and lose≤2.5%, moisture content≤0.5%, granularity 325 orders.
The pH value of described CMC is 8～9, and viscosity is >=280 Pa ﹒ s.
CaF in the fluorite powder 2Content>=95%, and fluorite powder degree is 200 order all-pass mistakes; In content>=95% of C in the ultra carbon black, the content of C>=97% in the semi-reinforcing hydrocarbon black.
Chemical composition in the said covering slag and weight percentage thereof are: SiO 2 :32%～34%, CaO:32～34%, AL 2O 3 : 2%～4%, MgO: Fe≤1%, 2O 3≤1%, F -: K 6%～8%, 2O+Na 2O+Li 2O:8%～10%, C:5%～7%.
Dual alkalinity (the CaO/SiO of covering slag of the present invention 2) be 1.04 ± 0.05; 1300 ℃ viscosity is 0.15 ± 0.09Pa ﹒ s; Fusing point is 1070 ± 30 ℃.
The preparation technology of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag of the present invention is:
1, raw material is prepared: all raw material sampling Detection, and chemical analysis must be qualified, fineness 200 orders, moisture content≤0.5%;
2, batching: weigh according to the prescription setting weight, pour bell into;
3, siccative stirs: the material in the bell was put into the twin-shaft mixer mechanical agitation 15 minutes;
4, wet agitation grinding: siccative is put into levigator and is added the wet stirring pulping of water, grinds and takes out slurry in 45 minutes;
5, mist projection granulating: magma is transported to the mist projection granulating tower through conveyance conduit under constant pressure, divides the slurry granulating and drying then.Tower: 3000 type spray drying granulation towers; Spray gun number: 12; Pressure is: 1Mpa; Mist projection granulating tower temperature requirement: inlet temperature >=700 ℃, outlet temperature >=150 ℃;
6, the finished product sub-sieve detects: granularity>=80 orders, moisture content≤0.5%;
7, finished product packing 10kg pouch seals transhipment;
8, finished product is transported the ton of packing into and is wrapped into the storehouse.
Embodiment 2
A kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag, the raw material of this covering slag is formed and weight percentage is: wollastonite 45%, fluorite powder 12%, soda ash 12%, Cab-O-sil 10%, ice crystal 5.5%, sodium fluoride 4%, in ultra carbon black 3.5%, semi-reinforcing hydrocarbon black 1.5%, lithium carbonate 2.5%, CMC 4%.
All the other are identical with embodiment 1.
Embodiment 3
A kind of continuous casting and rolling sheet billet low carbon steel crystallizer protective slag, the raw material of this covering slag is formed and weight percentage is: wollastonite 46%, fluorite powder 11%, soda ash 11%, Cab-O-sil 10% ice crystal 5%, sodium fluoride 5%, in ultra carbon black 4%, semi-reinforcing hydrocarbon black 2%, lithium carbonate 3%, CMC 3%.
All the other are identical with embodiment 1.

Claims (8)

1. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag, each constituent of the raw material of this covering slag and weight percentage are: wollastonite 40～50%, fluorite powder 10～15%, sodium fluoride 3～5%, soda ash 10～15%, Cab-O-sil 10～15%, ice crystal 5～12%, in ultra carbon black 3～4%, semi-reinforcing hydrocarbon black 1～2%, lithium carbonate 2～3%, CMC 2～5%.
2. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: each composition percentage composition is in the described wollastonite: CaO:46 ± 2%, SiO 2: 50 ± 2%, Fe 2O 3≤1%, MgO :≤1%, burn and lose≤2.5%, moisture content≤0.5%, granularity 325 orders.
3. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: CaF in the fluorite powder 2Content>=95%, and fluorite powder degree is 200 order all-pass mistakes.
4. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: in content >=95% of C in the ultra carbon black.
5. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: the content of C >=97% in the semi-reinforcing hydrocarbon black.
6. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: SiO in the Cab-O-sil 2Content>=98%, granularity is 200 order all-pass mistakes.
7. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1, it is characterized in that: chemical composition in this covering slag and weight percentage thereof are: SiO 2 :32%～34%, CaO:32～34%, AL 2O 3 : 2%～4%, MgO: Fe≤1%, 2O 3≤1%, F -: K 6%～8%, 2O+Na 2O+Li 2O:8%～10%, C:5%～7%.
8. continuous casting and rolling sheet billet low carbon steel crystallizer protective slag according to claim 1 is characterized in that: the dual alkalinity CaO/SiO of this covering slag 2The viscosity that is 1.04 ± 0.05,1300 ℃ is 0.15 ± 0.09Pa ﹒ s, and fusing point is 1070 ± 30 ℃.
CN2012102593002A 2012-07-25 2012-07-25 Slag powder of continuous casting and rolling sheet billet low-carbon steel crystallizer Pending CN102773438A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104511580A (en) * 2013-09-30 2015-04-15 上海梅山钢铁股份有限公司 Molten steel solvent for low-carbon steel
CN106583673A (en) * 2016-12-16 2017-04-26 河南通宇冶材集团有限公司 Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof
CN108723313A (en) * 2018-06-29 2018-11-02 洛阳普拉斯自动化科技装备有限公司 The covering slag of high grade cold rolling silicon steel

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104511580A (en) * 2013-09-30 2015-04-15 上海梅山钢铁股份有限公司 Molten steel solvent for low-carbon steel
CN106583673A (en) * 2016-12-16 2017-04-26 河南通宇冶材集团有限公司 Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof
CN108723313A (en) * 2018-06-29 2018-11-02 洛阳普拉斯自动化科技装备有限公司 The covering slag of high grade cold rolling silicon steel

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Application publication date: 20121114