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 PDF

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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
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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
Application number
US00304117A
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English (en)
Inventor
P Koenig
F Hofmanner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Holcim Ltd
SMS Concast AG
Original Assignee
Concast AG
Holderbank Financiere Glarus AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Concast AG, Holderbank Financiere Glarus AG filed Critical Concast AG
Application granted granted Critical
Publication of US3788840A publication Critical patent/US3788840A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
US00304117A 1971-11-12 1972-11-06 Flux powder for use during continuous casting of steel and method of producing same Expired - Lifetime US3788840A (en)

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 (fr)
JP (1) JPS4857827A (fr)
AU (1) AU467462B2 (fr)
BE (1) BE791207A (fr)
BR (1) BR7207918D0 (fr)
CA (1) CA975566A (fr)
CH (1) CH547134A (fr)
DE (1) DE2255398C3 (fr)
ES (1) ES408671A1 (fr)
FR (1) FR2159481B1 (fr)
GB (1) GB1361328A (fr)
IT (1) IT970407B (fr)
SE (1) SE387873B (fr)
ZA (1) ZA727958B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141528A (fr) * 1974-05-02 1975-11-14
EP0015417A1 (fr) * 1979-02-23 1980-09-17 Mobay Chemical Corporation Agent de scorification en particules fines et procédé de coulée continue de l'acier
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH573276A5 (fr) * 1974-01-29 1976-03-15 Concast Ag
JPS5629733B2 (fr) * 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928808A (fr) * 1972-07-12 1974-03-14

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141528A (fr) * 1974-05-02 1975-11-14
JPS5617403B2 (fr) * 1974-05-02 1981-04-22
EP0015417A1 (fr) * 1979-02-23 1980-09-17 Mobay Chemical Corporation Agent de scorification en particules fines et procédé de coulée continue de l'acier
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
JPS4857827A (fr) 1973-08-14
ES408671A1 (es) 1975-11-01
CH547134A (de) 1974-03-29
FR2159481A1 (fr) 1973-06-22
GB1361328A (en) 1974-07-24
DE2255398B2 (de) 1974-11-28
AU4875772A (en) 1974-05-16
CA975566A (en) 1975-10-07
IT970407B (it) 1974-04-10
DE2255398C3 (de) 1975-07-10
AU467462B2 (en) 1975-12-04
DE2255398A1 (de) 1973-05-17
FR2159481B1 (fr) 1982-06-11
BE791207A (fr) 1973-03-01
SE387873B (sv) 1976-09-20
BR7207918D0 (pt) 1973-08-23
ZA727958B (en) 1973-07-25

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