CN109954852A - A kind of 310S stainless steel continuous crystallizer protecting slag - Google Patents
A kind of 310S stainless steel continuous crystallizer protecting slag Download PDFInfo
- Publication number
- CN109954852A CN109954852A CN201910343354.9A CN201910343354A CN109954852A CN 109954852 A CN109954852 A CN 109954852A CN 201910343354 A CN201910343354 A CN 201910343354A CN 109954852 A CN109954852 A CN 109954852A
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- China
- Prior art keywords
- stainless steel
- slag
- crystallizer protecting
- steel continuous
- continuous crystallizer
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Classifications
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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
Abstract
The invention discloses a kind of 310S stainless steel continuous crystallizer protecting slag, chemical component and its weight percentage are as follows: SiO229%~34%, CaO 34%~40%, Li2O 1.2%~3%, Al2O35%~10%, Na2O 7%~12%, F‑7.5%~11%, Fe2O30~2%, free carbon 2%~4%, surplus is microelement.Covering slag heat transfer uniformity of the present invention is high and high lubricating effect, molten slag layer are stablized, and uniformly, be poured 310S stainless steel casting blank surface is 99% or more without cleaning rate, and slab is subcutaneous and internal soundness is good for fusing.
Description
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of 310S stainless steel continuous crystallizer protecting slag.
Background technique
310S stainless steel is austenitic chromium nickel stainless steel, because nickel (Ni), chromium (Cr) content are high, has good oxidation, resistance to
Burn into high temperature resistance is that the elements such as molybdenum, tungsten, niobium and titanium are added based on chromium, nickel, since its tissue is face-centered cubic knot
Structure, thus have high intensity and creep strength at high temperature.As function and protecting material necessary to continuous casting casting 310S stainless steel
Material, the limitation for having it to use, theoretically each steel grade should correspond to a kind of corresponding covering slag, it is necessary to accomplish dedicated
Slag could really realize the true metallurgical performance of covering slag in this way, provide technology branch for the product that steel mill produces high quality
Support.
Notification number be the Chinese patent of CN106513607B disclose a kind of 304 stainless steel continuous crystallizer protecting slags and
Preparation method.The covering slag chemical component and its weight percentage are as follows: SiO227.0%~30.0%, CaO 30.0%
~33%, Li2O 0.4%~1.0%, Al2O35%~7%, Na2O 8%~9%, F-5.0%~7.0%, MnO 2.0%~
4.0%, Fe2O3≤ 2.0%, CGu1%~2.0% and volatile matter 11%~15%.The invention covering slag is uniform and stable, and fusing is equal
It is even, solve in crystallizer easily crust, slag, slag inclusion, casting billet surface dry slag, rimhole, crackle, oscillation mark depth, bonding steel leakage
Problem improves 304 stainless steel casting blank quality.But the patent dual alkalinity is relatively low, covering slag heat-transfer effect is poor, and viscosity is relatively low,
The attaching ability of slag film and green shell is poor, poor lubricity, is not suitable for 310S stainless steel.
The Chinese patent application of Publication No. CN105598403A discloses a kind of stainless steel continuous crystallizer protecting slag,
The stainless steel is austenite antimicrobial stainless steel, and basicity is 1.0~1.1, can obtain fine Heat Transfer Control effect, is met difficult to understand
The needs of family name's body anti-bacteria stainless steel shrinkage character；0.10~0.18Pas when viscosity is set to 1300 DEG C keeps covering slag melt cinder more equal
It is even to be flowed into green shell and copper plate of crystallizer gap, slab is lubricated, meets crystallizer protecting residue consumption, viscosity mainly passes through
Al2O3, MgO and F-To control；Fusing point is 1130 DEG C~1190 DEG C, increases covering slag thermal resistance, crystallizer protecting residue conducts heat uniformly
Index increases, and is not likely to produce crackle；The invention raw material is easy to get, advantage of lower cost；Through field test, covering slag slugging is uniformly steady
Fixed, the slab edge recess rate of output reduces by 9.5%~19% or so, improves slab quality, it is ensured that steel mill's technique direct motion.
But the patent protection slag dual alkalinity is relatively low, covering slag heat-transfer effect is poor, and fusing point is high, and slugging speed is slower, and lubrication is not filled
Point, be not suitable for 310S stainless steel.
Summary of the invention
To overcome drawbacks described above, the purpose of the present invention is to provide a kind of 310S stainless steel continuous crystallizer protecting slags.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of 310S stainless steel continuous crystallizer protecting slag, chemical component and its weight percentage are as follows:
SiO229%~34%, CaO 34%~40%, Li2O 1.2%~3%, Al2O35%~10%, Na2O 7%~12%, F-
7.5%~11%, Fe2O30~2%, free carbon 2%~4%, surplus is microelement.
Preferably, the dual alkalinity CaO/SiO of the covering slag2It is 1.16~1.28,1100~1140 DEG C of fusing point,
1300 DEG C of viscosity are 0.16~0.23Pas.
Preferably, the covering slag is made of the raw material of following weight percentage:
Pre- melt 41%~50%, chamotte powder 9%~15%, lithium carbonate 2%~5%, fluorite 7%~12%, sodium fluoride
4%~6%, ice crystal 3%~6%, carbon black 1%~4%, soda ash 7%~12%, silica flour 3~8% and binder 2~
4%.
Preferably, the chemical component and its weight percentage of the pre- melt are as follows: SiO233%~40%, CaO
47%~54%, Al2O32%~4%, Na2O 2%~5%, MgO 1%~3%, F-3%~5%, Fe2O30~1%, surplus
For microelement.
Preferably, the chemical component and its weight percentage of the chamotte powder are as follows: SiO220%~26%, CaO
62%~70%, Al2O33%~5.5%, Fe2O32~5%, MgO 0.5%~3%, surplus are microelement.
Positive beneficial effect of the invention:
1. 310S stainless steel chromium nickel content of the present invention is high, it is denaturalized covering slag, deteriorates covering slag self performance, influence to protect
The heat transfer of slag, each chemical component of covering slag of the present invention share, stablize covering slag self performance, make covering slag heat transfer uniformity height and
High lubricating effect, molten slag layer are stablized, and fusing uniformly, is not easy to crust in crystallizer, is slag, slag inclusion, casting billet surface dry slag, subcutaneous
Bubble, crackle, oscillation mark depth, bonding steel leakage, be poured 310S stainless steel casting blank surface is 99% or more without cleaning rate, slab skin
Lower and internal soundness is good.
2. the dual alkalinity CaO/SiO of covering slag of the present invention2It is 1.16~1.28, basicity is higher, the crystallization rate of covering slag
It significantly improves, the heat transfer resistance for increasing covering slag has achieved the effect that Heat Transfer Control, and the crackle for reducing 310S stainless steel produces
It is raw；1100~1140 DEG C of fusing point of the present invention, fusing point is suitable, improves casting billet surface tension, hence it is evident that improves covering slag and absorbs field trash
Ability and lubricating action, increase the heat transfer of covering slag, stablize the slugging speed of entire slag system, reduce 310S stainless steel crackle
It generates；The viscosity of covering slag of the present invention is 0.16~0.23Pas, and viscosity is suitable, ensure that the thickness between slag film and green shell,
Lubrication is abundant.
3. chamotte powder of the present invention improves the calcium content of covering slag, promote the volatilization of covering slag volatile matter；Soda ash improves
The fusing point of covering slag promotes volatile matter volatilization, improves the adhesiveness between each raw material；Silica flour belongs to high silicon materials, and silicon contains
Amount reaches 96% or more, reduces the field trash inside other siliceous materials；The fusing uniformity and crystallization of the pre- melt of the present invention
Property relatively good, stable components, meet water after it is prevented from caking；Various raw materials share, and melting sources are uniform, and adhesiveness is good, to slab
High lubricating effect, meet the continuous casting needs of 310S stainless steel.
Specific embodiment
Below with reference to some specific embodiments, the present invention is further described.
The chemical component and its weight percent of the 310S stainless steel continuous crystallizer protecting slag of 1-8 of the embodiment of the present invention contain
Amount is shown in Table 1.
The various raw materials and its weight percent of the 310S stainless steel continuous crystallizer protecting slag of 1-8 of the embodiment of the present invention contain
Amount is shown in Table 2.
The preparation method of above-mentioned 310S stainless steel continuous crystallizer protecting slag, comprising the following steps:
Each raw material are crushed to 200~400 targeted fine powders, clear water is then added, make slurrying concentration 57~63%, then
Ball milling, Ball-milling Time >=50min, then mist projection granulating, obtains hollow particle shape covering slag.
The chemical component and its weight percentage of the pre- melt of 1-8 of the embodiment of the present invention are shown in Table 3.
The weight percentage of the chemical component of the chamotte powder of 1-8 of the embodiment of the present invention is shown in Table 4.
The physicochemical property of the 310S stainless steel continuous crystallizer protecting slag of 1-8 of the embodiment of the present invention is shown in Table 5.
The weight percentage (wt%) of the chemical component of 1 1-8 covering slag of the embodiment of the present invention of table
The various raw material weight percentage compositions (wt%) of 2 1-8 covering slag of the embodiment of the present invention of table
The weight percentage (wt%) of the chemical component of the 3 pre- melt of 1-8 of the embodiment of the present invention of table
The weight percentage (wt%) of the chemical component of 4 1-8 chamotte powder of the embodiment of the present invention of table
5 1-8 covering slag performance parameter of the embodiment of the present invention of table
Application test:
When certain company casting 310S stainless steel, using 1-8 covering slag of the embodiment of the present invention, experimental condition is specifically shown in Table 6.
6 experimental condition of table
Site test results show covering slag of the present invention preferable drawout of energy in crystallizer, and uniformly, the top of the slag is living for fusing
Jump, the slag circle of generation is few, and liquid slag layer is 0.3-0.4kg with a thickness of 10-12mm, steel slag consumption per ton, and covering slag of the present invention is being tied
The preferable drawout of energy in brilliant device, molten slag layer are stablized, and uniformly, the top of the slag is active, and the slag circle of generation is few, be poured casting billet surface for fusing
No cleaning rate is 99% or more, and slab is subcutaneous and internal soundness is good.
Claims (5)
1. a kind of 310S stainless steel continuous crystallizer protecting slag, which is characterized in that its chemical component and its weight percentage
Are as follows: SiO229%~34%, CaO 34%~40%, Li2O 1.2%~3%, Al2O35%~10%, Na2O 7%~
12%, F-7.5%~11%, Fe2O30~2%, free carbon 2%~4%, surplus is microelement.
2. 310S stainless steel continuous crystallizer protecting slag according to claim 1, which is characterized in that the covering slag
Dual alkalinity CaO/SiO2It is 1.16~1.28,1100~1140 DEG C of fusing point, 1300 DEG C of viscosity are 0.16~0.23Pas.
3. 310S stainless steel continuous crystallizer protecting slag according to claim 1, which is characterized in that the covering slag
It is made of the raw material of following weight percentage:
Pre- melt 41%~50%, chamotte powder 9%~15%, lithium carbonate 2%~5%, fluorite 7%~12%, sodium fluoride 4%~
6%, ice crystal 3%~6%, carbon black 1%~4%, soda ash 7%~12%, silica flour 3~8% and binder 2~4%.
4. 310S stainless steel continuous crystallizer protecting slag according to claim 1, which is characterized in that the pre- melt
Chemical component and its weight percentage are as follows: SiO233%~40%, CaO 47%~54%, Al2O32%~4%,
Na2O 2%~5%, MgO 1%~3%, F-3%~5%, Fe2O30~1%, surplus is microelement.
5. 310S stainless steel continuous crystallizer protecting slag according to claim 1, which is characterized in that the chamotte powder
Chemical component and its weight percentage are as follows: SiO220%~26%, CaO 62%~70%, Al2O33%~5.5%,
Fe2O32~5%, MgO 0.5%~3%, surplus are microelement.
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| CN201910343354.9A CN109954852A (en) | 2019-04-26 | 2019-04-26 | A kind of 310S stainless steel continuous crystallizer protecting slag |
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| CN201910343354.9A CN109954852A (en) | 2019-04-26 | 2019-04-26 | A kind of 310S stainless steel continuous crystallizer protecting slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620598A (en) * | 2020-12-16 | 2021-04-09 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder special for sorbite stainless steel and application thereof |
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Application publication date: 20190702 |