CN108568501A - A kind of pile for prestressed pipe steel continuous crystallizer protecting slag - Google Patents
A kind of pile for prestressed pipe steel continuous crystallizer protecting slag Download PDFInfo
- Publication number
- CN108568501A CN108568501A CN201810389891.2A CN201810389891A CN108568501A CN 108568501 A CN108568501 A CN 108568501A CN 201810389891 A CN201810389891 A CN 201810389891A CN 108568501 A CN108568501 A CN 108568501A
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- Prior art keywords
- slag
- pile
- prestressed pipe
- pipe steel
- steel continuous
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The invention belongs to metallurgical material technical fields, and in particular to a kind of pile for prestressed pipe steel continuous crystallizer protecting slag.The covering slag chemical composition and its weight percentage are：SiO231%~36%, CaO26%~31%, BaO2%~5%, Al2O33%~6%, Na2O2%~5%, F‑3%~6%, MnO4%~7%, Fe2O30.5%~2%, C10%~15%, surplus are impurity.Covering slag of the present invention preferable drawout of energy in crystallizer; liquid slag layer is stablized; fusing is uniform; the top of the slag is active; the slag circle of generation is few, significantly reduces the face crack/scab defects and subcrack defect of strand, poured into a mould strand strand reconditioning rate≤1.1%; slab quality is good, meets market demands.
Description
Technical field
The invention belongs to metallurgical material technical fields, and in particular to a kind of pile for prestressed pipe steel is protected with continuous cast mold
Slag.
Background technology
Pile for prestressed pipe steel is used to prepare PC rod irons,PC rod ironsIt is mainly used in and makes harbour concrete tubular pile, high level is built
Build ground concrete tubular pile, bridge pier concrete tubular pile.PC rod ironsWith the high and low relaxation of tensile strength, bond stress appropriateness, resistance to complications
The characteristics of long lifespan, and with good welding performance and warm upsetting performance, shape are continuous helical groove, therefore and concrete
Adhesive property is particularly splendid, so being screw-thread steel and building wire rodReplacement products, wide market.But prestressing force
Pile pile steel continuous casting process is more complicated than straight carbon steel, and the technological parameters such as pouring temperature, casting speed, cooling system require also more tight
Lattice, the slag technique processed and physicochemical property of covering slag must be strict with and control.
The Chinese patent application of Publication No. CN 106513607A discloses 304 stainless steels of one kind and is protected with continuous cast mold
Protect slag and preparation method thereof.The covering slag chemical composition and its weight percentage are：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 dual alkalinity of the covering slag
CaO/SiO2It is 1.04~1.14,1080~1110 DEG C of fusing point, 1300 DEG C of viscosity are 0.13~0.18Pas.The invention is protected
Slag is uniform and stable, and fusing is uniform, solve in crystallizer easily crust, slag, slag inclusion, casting billet surface dry slag, rimhole, split
Line, oscillation mark depth, bonding steel leakage problem, improve 304 stainless steel casting blank quality.But the patent protection basicity of slag is higher, percent crystallization in massecuite
Increase, the solidification of liquid slag film is fast, and strand is big with heat flux in mold, easy tos produce bonding steel leakage；Viscosity is relatively low, strand be easy with
Copper plate of crystallizer contact causes continuous casting to break；Above-mentioned covering slag is not suitable for the continuous casting of pile for prestressed pipe steel.
The Chinese patent application of Publication No. CN106493319A disclose a kind of high pulling rate continuous small-billet casting covering slag and
Preparation method, by weight percentage, chemical composition includes：28%≤CaO≤38%, 23%≤SiO2≤ 43%, 0%≤
Al2O3≤ 10%, MgO≤3%, Fe2O3≤ 2%, 5%≤F≤7%, 6≤Na2O≤9%, 0%≤Li2O≤3%, 0%≤
BaO≤15%, B2O3≤ 5%, 2%≤C≤10%, remaining is impurity；Basicity CaO/SiO2It is 0.65~1.6；Fusing point is 850
~1120 DEG C, 1300 DEG C of viscositys are 0.05~0.35Pas.The invention can prevent covering slag to be involved in relative to traditional slag system
Molten steel, while covering slag burn-off rate is fast, slag consumption is suitable, can guarantee good lubrication strand and Heat Transfer Control characteristic, can subtract
Lack slab surface crack defect and prevent bleed-out accident, it is ensured that casting process direct motion.But the patent fusing point is relatively low, fusing speed
Degree is very fast, and liquid slag layer is partially thick, easily causes strand slag inclusion；Viscosity is relatively low, and strand is easy to cause continuous casting to draw with copper plate of crystallizer contact
It is disconnected；Above-mentioned covering slag is not suitable for the continuous casting of pile for prestressed pipe steel.
Invention content
To overcome drawbacks described above, the purpose of the present invention is to provide a kind of pile for prestressed pipe steel to be protected with continuous cast mold
Slag.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of pile for prestressed pipe steel continuous crystallizer protecting slag, chemical composition and its weight percentage are：SiO2
31%~36%, CaO 26%~31%, BaO 2%~5%, Al2O33%~6%, Na2O 2%~5%, F-3%~
6%, MnO 4%~7%, Fe2O30.5%~2%, C 10%~15%, surplus are impurity.
Preferably, the dual alkalinity CaO/SiO of the covering slag2It is 0.74~1,1130~1180 DEG C, 1300 DEG C of fusing point
Viscosity is 0.36~0.6Pas.
Preferably, the covering slag is made of the following raw material：Pre- melt, bauxite, soda ash, sodium fluoride, barium carbonate, carbonic acid
Manganese, carbon black and binder.
Preferably, the chemical composition of the pre- melt and its weight percentage are：SiO238%~45%, CaO
40%~50%, Al2O32.0%~4.0%, Na2O 4%~7%, F-3%~5% and Fe2O30.5~2%.
Preferably, the binder is sodium lignin sulfonate.
Preferably, the preparation method of the pile for prestressed pipe steel continuous crystallizer protecting slag includes the following steps：
Various raw materials are according to chemical composition chosen, fine powder is crushed to, clear water is then added, make slurrying concentration 65~70%, so
Ball milling afterwards, 50~100min of Ball-milling Time, then 500~700 DEG C of mist projection granulatings to get.
Preferably, the grain size of the fine powder is 200~400 mesh.
The positive beneficial effect of the present invention：
1. SiO of the present invention2：It is the main network structure body in covering slag, the differentiation tendency of vitreum can be improved,
SiO2Increase the conductivity of heat of covering slag can be improved, reduce covering slag crystallization property, it is advantageous to the lubricant effect of covering slag.This hair
Bright SiO2Weight percentage 31~36%.
CaO：Belong to basic anhydride, is the main matter for adjusting covering slag acid-base value, high alkalinity covering slag can be improved molten
Solution, the speed for absorbing steel inclusion, but CaO is easy to other compositions in slag and forms dystectic crystal phase, causes covering slag
Fusion temperature increase and glass form be deteriorated.CaO weight percentages 26~31% of the present invention.
CaO/SiO2It is the dual alkalinity of covering slag, is an important parameter for weighing Property of Mold Powder, influences to protect
Protect slag viscosity and dissolve non-metallic inclusion ability principal element, can with control strand and crystallizer between biography
Heat weakens as basicity increases covering slag vitrifying characteristic, and covering slag condenses rear vitreous body and reduces, and percent crystallization in massecuite increases, liquid slag
Film solidification is fast, and strand is big with heat flux in mold, easy tos produce bonding steel leakage, if basicity is too low, slag film transparency is high, heat transfer
Soon, the crackle of casting billet surface, the dual alkalinity CaO/SiO of covering slag of the present invention are be easy to cause2It is 0.74~1.
BaO：BaO fusing points (1923 DEG C) are lower than CaO fusing point (2572 DEG C), and the CaO of equivalent is substituted with appropriate BaO, can be dropped
The fusing point of low covering slag.BaO 2%~5% of the present invention.
Al2O3：Belong to amphoteric oxide, dissolving, the speed for absorbing steel inclusion can be improved, viscosity, knot to covering slag
Crystalline substance tendency influences bigger, too high levels, is easy to increase the viscosity of slag, is unfavorable for lubricating.Al of the present invention2O3Weight percent contains
Amount is 3%~6%.
Na2O：It can significantly reduce the setting temperature of covering slag, it is suppressed that covering slag crystallization, while also reducing fusion temperature.
Na of the present invention2O 2%~5%.
F-：It is affected to heat flow density and heat transfer coefficient, with F-Content increases, and heat flow density and heat transfer coefficient decline
Amplitude is very big.F of the present invention-3~6%.
MnO：Belong to transition metal oxide, when basicity is relatively low, as MnO increases, covering slag slag film is still all glass
Glass body, but slag film transparency is substantially reduced, temperature diffusivity reduces, and heat transfer is uniform, when basicity is higher, has in slag film and contains on a small quantity
The precipitation of manganese mineral, MnO can also inhibit Mn and SiO in steel2Reaction.MnO 4%~7% of the present invention.
Fe2O3：Belong to transition metal oxide, shared with MnO, the radiant heat transfer in crystallizer is controlled, ensures to pass
It is hot uniform.Fe of the present invention2O30.5%~2.0%.
C：Burn-off rate for controlling covering slag, covering slag C 10%~15% of the present invention.
Above-mentioned each chemical composition shares, and so that covering slag preferable drawout of energy in crystallizer, liquid slag layer is stablized, fusing is equal
Even, the top of the slag is active, and the slag circle of generation is few, significantly reduces the face crack/scab defects and subcrack defect of strand, is poured
Strand strand reconditioning rate≤1.1% is noted, slab quality is good, meets market demands.
2. raw material sources of the present invention are extensive, cheap, each raw material shares, and gained covering slag viscosity is appropriate, lubrication
Effect is good, and frictional force is small, and fusing is uniform, meets the needs of high pulling rate and the diverse strand continuous casting manufacturing technique of pulling rate.
Specific implementation mode
With reference to some specific implementation modes, the present invention is further described.
The chemical composition and its weight percent of the pile for prestressed pipe steel continuous crystallizer protecting slag of 1-8 of the embodiment of the present invention
Content is shown in Table 1.
The performance parameter of the pile for prestressed pipe steel continuous crystallizer protecting slag of 1-8 of the embodiment of the present invention is shown in Table 2.
The preparation method of embodiment 1-8 any one of them pile for prestressed pipe steel continuous crystallizer protecting slags, including with
Lower step：
Various raw materials are according to chemical composition chosen, 200~400 targeted fine powders is crushed to, clear water is then added, make slurrying concentration
65~70%, then ball milling, 50~100min of Ball-milling Time, then 500~700 DEG C of mist projection granulatings to get.
The covering slag is made of the following raw material：Pre- melt, bauxite, soda ash, sodium fluoride, barium carbonate, manganese carbonate, carbon black
And binder.
The chemical composition and its weight percentage of the pre- melt be：SiO238%~45%, CaO 40%~
50%, Al2O32.0%~4.0%, Na2O 4%~7%, F-3%~5% and Fe2O30.5~2%.
The weight percentage (wt%) of the chemical composition of 1 embodiment 1-8 covering slags of table
2 1-8 covering slag performance parameters of the embodiment of the present invention of table
As shown in Table 2, the dual alkalinity CaO/SiO of the covering slag2It is 0.74~1.0,1130~1180 DEG C of fusing point,
1300 DEG C of viscosity are 0.36~0.6Pas, and covering slag dual alkalinity of the present invention is suitable, have good lubricant effect, Er Qieti
High covering slag crystallization rate increases slag film resistance, reaches strand slow cooling effect, reduces crackle and generate；The present invention protects slag melting point to close
It is suitable, liquid slag 10~12mm of film thickness is kept, the hot-fluid effect in crystallizer is improved；Covering slag viscosity of the present invention is suitable, prevents
Crystallizer floating Reoxides cause the phenomenon that sticky slag, slag fluidity variation insufficient lubrication to occur, and meet high pulling rate
With the needs of the diverse strand continuous casting manufacturing technique of pulling rate.
Application test：
When certain company casting pile for prestressed pipe steel, using 1-8 covering slags of the embodiment of the present invention, experiment actual conditions are shown in Table 3,
Test result is shown in Table 4.
3 experimental condition of table
4 1-8 covering slags of the embodiment of the present invention of table use slab quality situation
Covering slag of the present invention preferable drawout of energy in crystallizer, fusing is uniform, and the top of the slag is active, and the slag circle of generation is few,
Melt cinder layer thickness is 10-12mm, and slag consumption per ton is 0.3-0.4kg, and as shown in Table 4, covering slag of the present invention significantly reduces
Face crack/the scab defects and subcrack defect of strand, poured into a mould strand strand reconditioning rate≤1.1%, slab quality are good
It is good, meet market demands.
Claims (4)
1. a kind of pile for prestressed pipe steel continuous crystallizer protecting slag, which is characterized in that its chemical composition and its weight percent contain
Amount is：SiO231%~36%, CaO 26%~31%, BaO 2%~5%, Al2O33%~6%, Na2O 2%~5%,
F-3%~6%, MnO 4%~7%, Fe2O30.5%~2%, C 10%~15%, surplus are impurity.
2. pile for prestressed pipe steel continuous crystallizer protecting slag according to claim 1, which is characterized in that the covering slag
Dual alkalinity CaO/SiO2It is 0.74~1,1130~1180 DEG C of fusing point, 1300 DEG C of viscosity are 0.36~0.6Pas.
3. pile for prestressed pipe steel continuous crystallizer protecting slag according to claim 1 or 2, which is characterized in that described
The preparation method of covering slag includes the following steps：
Various raw materials are according to chemical composition chosen, fine powder is crushed to, clear water is then added, make slurrying concentration 65~70%, then ball
Mill, 50~100min of Ball-milling Time, then 500~700 DEG C of mist projection granulatings to get.
4. pile for prestressed pipe steel continuous crystallizer protecting slag according to claim 3, which is characterized in that the fine powder
Grain size is 200~400 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389891.2A CN108568501A (en) | 2018-04-27 | 2018-04-27 | A kind of pile for prestressed pipe steel continuous crystallizer protecting slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389891.2A CN108568501A (en) | 2018-04-27 | 2018-04-27 | A kind of pile for prestressed pipe steel continuous crystallizer protecting slag |
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| Publication Number | Publication Date |
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| CN108568501A true CN108568501A (en) | 2018-09-25 |
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ID=63574343
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|---|---|---|---|
| CN201810389891.2A Pending CN108568501A (en) | 2018-04-27 | 2018-04-27 | A kind of pile for prestressed pipe steel continuous crystallizer protecting slag |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355261A (en) * | 2020-10-26 | 2021-02-12 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN112705678A (en) * | 2020-12-16 | 2021-04-27 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for hot work die steel slab and application thereof |
| CN114178498A (en) * | 2021-10-26 | 2022-03-15 | 南京钢铁股份有限公司 | Special covering slag for non-quenched and tempered steel continuous casting crystallizer and preparation process thereof |
| CN114905013A (en) * | 2022-05-16 | 2022-08-16 | 江阴兴澄特种钢铁有限公司 | Crystallizer casting powder suitable for casting round billets with diameter of 1000mm and above and preparation method thereof |
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| CN101733378A (en) * | 2010-01-11 | 2010-06-16 | 河南省西保冶材集团有限公司 | BaO-containing functional protective material for continuous casting crystallizer |
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| CN105522130A (en) * | 2016-03-09 | 2016-04-27 | 西峡龙成冶金材料有限公司 | Medium carbon steel chamfering copper plate continuous casting mold covering slag and preparation method thereof |
| CN106513607A (en) * | 2016-12-30 | 2017-03-22 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer casting powder for 304 stainless steel and preparation method thereof |
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Patent Citations (6)
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| CN101733378A (en) * | 2010-01-11 | 2010-06-16 | 河南省西保冶材集团有限公司 | BaO-containing functional protective material for continuous casting crystallizer |
| CN102009142A (en) * | 2010-08-09 | 2011-04-13 | 河南省西保冶材集团有限公司 | 30MnSi steel special continuous casting crystallizer functional protection material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355261A (en) * | 2020-10-26 | 2021-02-12 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN112355261B (en) * | 2020-10-26 | 2022-06-28 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN112705678A (en) * | 2020-12-16 | 2021-04-27 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for hot work die steel slab and application thereof |
| CN112705678B (en) * | 2020-12-16 | 2022-04-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for hot work die steel slab and application thereof |
| CN114178498A (en) * | 2021-10-26 | 2022-03-15 | 南京钢铁股份有限公司 | Special covering slag for non-quenched and tempered steel continuous casting crystallizer and preparation process thereof |
| CN114905013A (en) * | 2022-05-16 | 2022-08-16 | 江阴兴澄特种钢铁有限公司 | Crystallizer casting powder suitable for casting round billets with diameter of 1000mm and above and preparation method thereof |
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Application publication date: 20180925 |