US3788840A - Flux powder for use during continuous casting of steel and method of producing same - Google Patents
Flux powder for use during continuous casting of steel and method of producing same Download PDFInfo
- Publication number
- US3788840A US3788840A US00304117A US3788840DA US3788840A US 3788840 A US3788840 A US 3788840A US 00304117 A US00304117 A US 00304117A US 3788840D A US3788840D A US 3788840DA US 3788840 A US3788840 A US 3788840A
- Authority
- US
- United States
- Prior art keywords
- powder
- steel
- continuous casting
- slag
- flux
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title abstract description 58
- 230000004907 flux Effects 0.000 title abstract description 23
- 238000009749 continuous casting Methods 0.000 title abstract description 13
- 238000000034 method Methods 0.000 title abstract description 8
- 229910000831 Steel Inorganic materials 0.000 title description 23
- 239000010959 steel Substances 0.000 title description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 35
- 229910052799 carbon Inorganic materials 0.000 abstract description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 17
- 239000011398 Portland cement Substances 0.000 abstract description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000377 silicon dioxide Substances 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 239000010453 quartz Substances 0.000 abstract description 8
- 239000002893 slag Substances 0.000 description 24
- 238000002844 melting Methods 0.000 description 12
- 230000008018 melting Effects 0.000 description 12
- 238000005266 casting Methods 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 235000012239 silicon dioxide Nutrition 0.000 description 8
- 239000006229 carbon black Substances 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000001969 wideband alternating-phase low-power technique for zero residual splitting Methods 0.000 description 1
Classifications
-
- 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
Definitions
- the present invention relates to an improved flux or slag powder for use in the continuous casting of steel, and of the type containing portland cement, a fluxing agent and a carbon carrier, and the invention also pertains to a method of producing such fluxor slag powder.
- the metal bath in the continuous casting mold is oftentimes covered with a flux or slag powder. It absorbs non-metallic contaminants or foreign particles, functions as a lubricant between the wall of the mold and the continuously cast strand or casting, prevents oxidation of the steel and reduces thermal radiation.
- a slag or flux powder the composition of which contains, among other things, portland cement, sodium carbonate, and carbon donors. Due to the likewise present refractory clay powder, the con tent of alumina is undesirably raised, so that with absorption of alumina from the steel bath, the dissolving capacity of the slag for further absorption of alumina becomes increasingly more difi'icult, which is disadvantageous during casting of aluminum killed steels. Furthermore, there is used as the carbon donor coke fines or graphite powder, the average grain size of which is relatively coarse and the grain size distribution variable, so that it is practically impossible to carry out an exact adjustment of the melting behavior.
- Another and more specific object of the present invention aims at the provision of a flux powder, the melting rate of which can be adjusted and which in the melted state is capable, when required, of absorbing extremely large amounts of alumina with only a slight increase in its melting temperature, and furthermore is capable of uniformly flowing-off through the gap between the mold and the continuously cast strand, so that tapping of the slag is no longer necessary.
- a further object of the present invention relates to an improved flux powder, and method for the production thereof, which possesses an extremely precise consistency in its composition or analysis and tree of halogen compounds, such as fluorite.
- the powder of this development should also be used for casting steels which do not precipitate or separate out any alumina (clay) or aluminum oxide respectively, for instance certain rustproof or corrosion resistant steels predominantly treated with silicon.
- alumina clay
- aluminum oxide aluminum oxide
- certain rustproof or corrosion resistant steels predominantly treated with silicon
- the powder during use especially when added to the melt, should develop as little dust a possible and likewise as little smoke as possible.
- the flux or slag powder of this development which is contemplated for use in the continuous casting of steel contains portland cement, a fluxing agent and a carbon carrier.
- the carbon carrier has a grain size of less than 1,
- the aluminum oxide content is in the range between 2 and 12% by weight
- the lime-silica (silicic acid) ratio is adjusted to be in the range between 0.7 and 1.0 through the addition of quartz powder.
- the basic material of the flux powder consists of S0 to by weight portland cement. Furthermore, as is well known in this particular art, the powder contains as the fluxing agent an anhydrous alkali carrier, for instance calcinated sodium carbonate which is present in an amount of 20% by weight.
- anhydrous alkali carrier for instance calcinated sodium carbonate which is present in an amount of 20% by weight.
- the flux powder contain a real fine carbon carrier, that is to say, a carbon carrier with a grain or granulation size below lg, since apart from the absolute content of carbon carrier its fineness is decisive and thereby it is possible to adjust the melting or fusing rate of the powder.
- a real fine carbon carrier that is to say, a carbon carrier with a grain or granulation size below lg, since apart from the absolute content of carbon carrier its fineness is decisive and thereby it is possible to adjust the melting or fusing rate of the powder.
- carbon black in an amount of l8% by weight. This material constitutes a readily accessible starting material and possesses constant properties and offers guarantees for faultless, uniform melting. Furthermore, it is most economical in the required fineness or granulation size as the carbon carrier. By varying the quantitative amounts of carbon black which are added within the indicated range, it is possible to adjust to a desired degree the melting rate.
- the A1 0 content in the powder advantageously should amount to between 212% by weight for aluminum-free steels, for steels containing aluminum between 27% by weight, which can be insured for by the content of alumina or clay in the basic material portland cement with or without the admixture of alumina or clay.
- the low content of A1 0 in the range of 27% by weight for casting aluminum-containing steels affords two advantages: firstly, the dissolving capacity of the molten slag is increased for precipitation of the alumina or clay of the liquid steel with as little as possible increase in the melting temperature of the slag.
- the inventive conditions that is to say, especially with a lime-silica ratio which is adjusted to be between 0.7 and 1.0, a flowing-off of the slag into the shrinkage gap between the cast strand and the mold, and the desired lubricating conditions are maintained.
- the melting temperature of the slag is initially lowered owing to the reaction of the alumina which at the start is absorbed from the steel with the oxidic constituents already present in the slag. Lowering of the melting point facilitates the flow behavior of the slag and renders more difficult a continual enrichment of the alumina in the slag blanket. There does not occur any impermissible thickening thereof and tapping of the slag is not required.
- the inventive powder in contrast to the prior art powders, possesses the notable beneficial advantage that there does not occur any development of dust and smoke, suppressing health dangers which otherwise would be present. Furthermore, there could be ascertained an improved trickling effect, which is favorable in terms of an automatic compensation of the pour height of the powder layer in the mold.
- the lime-silica ratio of the powder is adjusted to a value between 0.7 and 1.0 through the addition of up to 30% by weight quartz powder, of a purity of about 99.5%. Quartz, with its high melting point, has, as a component of the flux or slag powder, the advantage that when the powder is used it first leads to the formation of a lowmelting slag phase when the insulating carbon in the powder is decomposed.
- the latter always possesses constant mineralogical and analysis properties and therefore constant behavior in the mold with regard to melting, insulating, solubility and lubricating properties.
- a flux powder for use in the continuous casting of steel containing portland cement, a fluxing agent, and a carbon carrier, the improvement comprising the carbon carrier possessing a grain size of less than lg, the powder having an aluminum oxide content in the range of 2-12 percent by weight, and a lime-silica ratio adjusted between 0.7 and 1.0 through the addition of quartz powder.
- a flux powder for use in the continuous casting of steel containing portland cement, a fiuxing agent, and a carbon carrier, the improvement comprising the carbon carrier possessing a grain size of less than l t, the powder having an aluminum oxide content in the range of 2-12 percent by weight, and a lime-silica ratio between 0.7 and 1.0.
- a method of producing a composition useful as a flux powder for continuous casting of steel and containing portland cement, a fluxing agent, and carbon carrier comprising the steps of controlling" the granulation size of the carbon carrier so as to be beneath In, controlling the aluminum oxide content of the powder to be between 2 and 12 percent by weight, and adding quartz powder in an amount sufiicient to adjusting the lime-silica ratio to be between 0.7 and 1.0.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1647471 | 1971-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3788840A true US3788840A (en) | 1974-01-29 |
Family
ID=4417693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00304117A Expired - Lifetime US3788840A (en) | 1971-11-12 | 1972-11-06 | Flux powder for use during continuous casting of steel and method of producing same |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US3788840A (it) |
| JP (1) | JPS4857827A (it) |
| AU (1) | AU467462B2 (it) |
| BE (1) | BE791207A (it) |
| BR (1) | BR7207918D0 (it) |
| CA (1) | CA975566A (it) |
| CH (1) | CH547134A (it) |
| DE (1) | DE2255398C3 (it) |
| ES (1) | ES408671A1 (it) |
| FR (1) | FR2159481B1 (it) |
| GB (1) | GB1361328A (it) |
| IT (1) | IT970407B (it) |
| SE (1) | SE387873B (it) |
| ZA (1) | ZA727958B (it) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50141528A (it) * | 1974-05-02 | 1975-11-14 | ||
| EP0015417A1 (de) * | 1979-02-23 | 1980-09-17 | Mobay Chemical Corporation | Feinteiliges Verschlackungsmittel und Verfahren zum Stranggiessen von Stahl |
| US4419131A (en) * | 1981-05-14 | 1983-12-06 | Mobay Chemical Corporation | Flux for continuous casting |
| US4581068A (en) * | 1985-05-06 | 1986-04-08 | Frank & Schulte Gmbh | Shaped body for feeding cupola furnaces |
| US4594105A (en) * | 1985-01-22 | 1986-06-10 | Bayer Aktiengesellschaft | Casting powder for the continuous casting of steel and a process for the continuous casting of steel |
| US5397379A (en) * | 1993-09-22 | 1995-03-14 | Oglebay Norton Company | Process and additive for the ladle refining of steel |
| US6174347B1 (en) | 1996-12-11 | 2001-01-16 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| CN110605364A (zh) * | 2019-09-24 | 2019-12-24 | 河南通宇冶材集团有限公司 | 一种环保型中间包覆盖剂及其制备方法 |
| CN110976797A (zh) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | 一种方、矩坯中高碳钢用微碳保护渣及其制备方法 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH573276A5 (it) * | 1974-01-29 | 1976-03-15 | Concast Ag | |
| JPS5629733B2 (it) * | 1974-11-28 | 1981-07-10 | ||
| JPS6037250A (ja) * | 1983-08-10 | 1985-02-26 | Kawasaki Steel Corp | 鋼の連続鋳造用鋳型添加剤 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4928808A (it) * | 1972-07-12 | 1974-03-14 |
-
0
- BE BE791207D patent/BE791207A/xx unknown
-
1971
- 1971-11-12 CH CH1647471A patent/CH547134A/xx not_active IP Right Cessation
-
1972
- 1972-11-06 US US00304117A patent/US3788840A/en not_active Expired - Lifetime
- 1972-11-10 IT IT31542/72A patent/IT970407B/it active
- 1972-11-10 FR FR7239983A patent/FR2159481B1/fr not_active Expired
- 1972-11-10 BR BR007918/72A patent/BR7207918D0/pt unknown
- 1972-11-10 SE SE7214584A patent/SE387873B/xx unknown
- 1972-11-10 ES ES408671A patent/ES408671A1/es not_active Expired
- 1972-11-10 AU AU48757/72A patent/AU467462B2/en not_active Expired
- 1972-11-10 GB GB5214672A patent/GB1361328A/en not_active Expired
- 1972-11-10 CA CA156,269A patent/CA975566A/en not_active Expired
- 1972-11-10 ZA ZA727958A patent/ZA727958B/xx unknown
- 1972-11-11 DE DE2255398A patent/DE2255398C3/de not_active Expired
- 1972-11-13 JP JP47113060A patent/JPS4857827A/ja active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50141528A (it) * | 1974-05-02 | 1975-11-14 | ||
| JPS5617403B2 (it) * | 1974-05-02 | 1981-04-22 | ||
| EP0015417A1 (de) * | 1979-02-23 | 1980-09-17 | Mobay Chemical Corporation | Feinteiliges Verschlackungsmittel und Verfahren zum Stranggiessen von Stahl |
| US4419131A (en) * | 1981-05-14 | 1983-12-06 | Mobay Chemical Corporation | Flux for continuous casting |
| US4594105A (en) * | 1985-01-22 | 1986-06-10 | Bayer Aktiengesellschaft | Casting powder for the continuous casting of steel and a process for the continuous casting of steel |
| US4581068A (en) * | 1985-05-06 | 1986-04-08 | Frank & Schulte Gmbh | Shaped body for feeding cupola furnaces |
| US5397379A (en) * | 1993-09-22 | 1995-03-14 | Oglebay Norton Company | Process and additive for the ladle refining of steel |
| US6174347B1 (en) | 1996-12-11 | 2001-01-16 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| US6179895B1 (en) | 1996-12-11 | 2001-01-30 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| CN110605364A (zh) * | 2019-09-24 | 2019-12-24 | 河南通宇冶材集团有限公司 | 一种环保型中间包覆盖剂及其制备方法 |
| CN110976797A (zh) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | 一种方、矩坯中高碳钢用微碳保护渣及其制备方法 |
| CN110976797B (zh) * | 2019-12-25 | 2022-06-07 | 河南通宇冶材集团有限公司 | 一种方、矩坯中高碳钢用微碳保护渣及其制备方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA727958B (en) | 1973-07-25 |
| AU4875772A (en) | 1974-05-16 |
| CA975566A (en) | 1975-10-07 |
| GB1361328A (en) | 1974-07-24 |
| DE2255398B2 (de) | 1974-11-28 |
| FR2159481B1 (it) | 1982-06-11 |
| FR2159481A1 (it) | 1973-06-22 |
| BR7207918D0 (pt) | 1973-08-23 |
| AU467462B2 (en) | 1975-12-04 |
| IT970407B (it) | 1974-04-10 |
| ES408671A1 (es) | 1975-11-01 |
| JPS4857827A (it) | 1973-08-14 |
| DE2255398A1 (de) | 1973-05-17 |
| DE2255398C3 (de) | 1975-07-10 |
| CH547134A (de) | 1974-03-29 |
| SE387873B (sv) | 1976-09-20 |
| BE791207A (fr) | 1973-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3788840A (en) | Flux powder for use during continuous casting of steel and method of producing same | |
| He et al. | Review of Mold Fluxes for Continuous Casting of High‐Alloy (Al, Mn, Ti) Steels | |
| KR102277782B1 (ko) | 캐스팅 분말, 캐스팅 슬래그 및 강의 캐스팅 방법 | |
| JP4337748B2 (ja) | 鋼の連続鋳造用モールドパウダー | |
| US4141722A (en) | Method of treating ferruginous slags | |
| KR910006098B1 (ko) | 주형 첨가제 | |
| US3567432A (en) | Metal casting | |
| JP3142216B2 (ja) | 鋼の連続鋳造用モールドパウダー | |
| JP3141187B2 (ja) | 鋼の連続鋳造用パウダー | |
| CN113070457B (zh) | 一种高拉速连铸用结晶器保护渣 | |
| KR100252483B1 (ko) | 강의 연속주조용 몰드파우더 | |
| US3949803A (en) | Method of casting molten metal using mold additives | |
| US4162159A (en) | Cast iron modifier and method of application thereof | |
| JP2003053497A (ja) | 連続鋳造用フラックス | |
| JP3107739B2 (ja) | 鋼の連続鋳造用パウダーのプリメルトフラックス | |
| JPS6344463B2 (it) | ||
| JP2020032428A (ja) | 鋼の連続鋳造用モールドパウダー | |
| JP3860446B2 (ja) | 鋼の連続鋳造法 | |
| JPH0677792B2 (ja) | 極低炭素鋼鋳造用パウダ− | |
| JPH084886B2 (ja) | 鋼の連続鋳造用湯面保護剤 | |
| AT320184B (de) | Gießpulver zur Verwendung beim Stranggießen von Stahl | |
| KR900007442B1 (ko) | 용강의 개재물 흡수용 첨가제 | |
| JPS6344464B2 (it) | ||
| JP3296376B2 (ja) | 鋳型添加剤 | |
| JPS60141355A (ja) | 連続鋳造用湯面保護剤 |