EP0018633B1 - Poudre de coulée pour la coulée continue de l'acier - Google Patents

Poudre de coulée pour la coulée continue de l'acier Download PDF

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Publication number
EP0018633B1
EP0018633B1 EP80102344A EP80102344A EP0018633B1 EP 0018633 B1 EP0018633 B1 EP 0018633B1 EP 80102344 A EP80102344 A EP 80102344A EP 80102344 A EP80102344 A EP 80102344A EP 0018633 B1 EP0018633 B1 EP 0018633B1
Authority
EP
European Patent Office
Prior art keywords
casting
steel
weight
slag
continuous casting
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
Application number
EP80102344A
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German (de)
English (en)
Other versions
EP0018633A3 (en
EP0018633A2 (fr
Inventor
Anton Dr. Dipl.-Chem. More
Albert Dipl.-Ing. Tosin
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.)
Wacker Chemie AG
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Wacker Chemie AG
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Publication date
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Application filed by Wacker Chemie AG filed Critical Wacker Chemie AG
Priority to AT80102344T priority Critical patent/ATE3251T1/de
Publication of EP0018633A2 publication Critical patent/EP0018633A2/fr
Publication of EP0018633A3 publication Critical patent/EP0018633A3/de
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Publication of EP0018633B1 publication Critical patent/EP0018633B1/fr
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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 invention relates to a casting powder for the continuous casting of steel on the basis of silicate slags following analysis values as well as impurities due to raw materials.
  • casting powder is generally introduced into the continuous casting mold in order to protect the liquid steel flowing into the mold by means of an immersion tube against reoxidation, to dissolve the ascending oxidic inclusions and to produce a well-lubricated lubricating film between the solidifying steel strand and the mold.
  • Mixtures of finely ground, oxidic and carbonate raw materials are mostly used for this purpose. These mixtures can also contain a few percent of graphite to prevent the powder particles from prematurely sintering or melting into lumps when heated (see US Pat. No. 3,964,916).
  • the mixed continuous casting powders are very uncomfortable to handle, because they are very dusty when they are poured into the mold.
  • the powders mentioned in practice there is a common defect: the powders form more or less large lumps on the surface of the bath before a melted slag layer is formed. These lumps attach to the edge of the mold and form the dreaded cinder lines, which create impressions in the surface of the steel strand. The defects on the strand surface have to be removed at great cost either by flaming or grinding.
  • the invention is therefore based on the object of creating a casting powder, the dreaded slag cords of which do not occur when it is used and therefore the strand surface has a maximum degree of flawlessness.
  • a casting powder based on the silicate slags described in the introduction which is characterized in that it is premelted and foamed and its individual particles ground and sieved to a grain size of up to 5 mm by means of an adhesive with a layer of 1.5 to 15 % By weight of carbon black and / or graphite are coated.
  • slag composition within the specified limits depends in individual cases on the special casting conditions, the particular type of continuous casting machine used and the steel melts used which are cast on the continuous casting machine.
  • the casting powder according to the invention When using the casting powder according to the invention, the otherwise very unpleasant development of smoke when introducing conventional continuous casting powder is avoided. When the powders are melted in the mold, there are no malodorous gases, such as those which often occur with other conventional casting powders, and are a nuisance to the operating personnel. Another great advantage of the casting powder according to the invention is that it does not dust when poured into the mold.
  • a steel with the analysis 0.06% C, 0.02% Si and 0.35% Mn was cast on a slab format 1000 x 210 mm at a casting speed of 1.6 m / minute. This steel is a deep-drawing quality for the production of thin sheet metal for car bodies.
  • silicate granules foamed to a bulk density of approx. 1 kg / l were sieved to a grain size of 0.1 to 1.5 mm and with the aid of 0.6% by weight 10% aqueous.
  • Polyvinyl alcohol coated with 4% carbon black were used.
  • This continuous casting powder thus produced was used in the casting of the steel mentioned above. 493 t of steel were cast.
  • the casting powder consumption was 200 kg, corresponding to a consumption of 0.4 kg / t poured steel.
  • the slabs produced using the continuous casting powder according to the invention had an excellent surface quality, which was judged solely and very well by the usual criteria.
  • the surfaces of the slabs were particularly free from edge cracks and surface cracks. Except for the sprue, no pores or inclusions were found in the surface of the slab, as are otherwise very common when casting this high-aluminum steel.
  • the spreading was increased significantly due to the excellent block surface compared to the usual quality level.
  • a steel was cast with the following analysis: 0.08% C, 0.5% Si, 1.5% Mn and 1% Cr.
  • the slag was foamed to a bulk density of 0.9 kg / l, ground to a grain size of 0.1-2 mm and with the aid of 0.8% by weight of 10% aqueous polyvinyl alcohol with 6% by weight of carbon black and graphite coated in equal parts, based on the weight of the silicate slag.
  • a steel was cast with the following analysis: 0.6% C, 0.3% Si and 0.6% Mn.
  • the slag was foamed to a bulk density of 1.3 kg / l, ground to a grain size of 0.1-1.5 mm and, with the aid of 2.5% by weight of 10% aqueous polyvinyl alcohol, with 12% by weight of a Mixture of carbon black and graphite coated in equal parts.
  • the billets produced in this way had a much better surface area than those obtained with the mixed continuous casting powders, which was expressed in that the grinding loss in the billets produced with the powder according to the invention was only about 4%, while when using the mixed powders which are usually used a grinding loss of around 7-8% is expected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (4)

1. Poudre de coulée à base de laitiers de silicates pour la coulée continue de l'acier, poudre qui a les valeurs analytiques suivantes :
Figure imgb0008
et qui est caractérisée en ce qu'elle est préfondue et écumée et en ce que ses particules élémentaires broyées et tamisées à une taille de grains maximale de 5 mm sont revêtues d'une couche de 1,5 à 15 % en poids de noir de carbone et/ou de graphite au moyen d'un adhésif.
2. Poudre de coulée suivant la revendication 1, caractérisée en ce que sa masse volumique apparente, ajustée par écumage, est comprise entre 0,8 et 1,2 kg/litre.
3. Poudre de coulée suivant l'une des revendications 1 et 2, caractérisée en ce que sa taille de grains est de 2 mm au maximum et n'est pas inférieure à 0,1 mm pour 98 % en poids de ses particules élémentaires.
4. Poudre de coulée suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que ses particules élémentaires sont revêtues de 2 à 6 % en poids de noir de carbone et/ou de graphite.
EP80102344A 1979-05-02 1980-04-30 Poudre de coulée pour la coulée continue de l'acier Expired EP0018633B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80102344T ATE3251T1 (de) 1979-05-02 1980-04-30 Giesspulver zum stranggiessen von stahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2917763 1979-05-02
DE19792917763 DE2917763A1 (de) 1979-05-02 1979-05-02 Giesspulver zum stranggiessen von stahl

Publications (3)

Publication Number Publication Date
EP0018633A2 EP0018633A2 (fr) 1980-11-12
EP0018633A3 EP0018633A3 (en) 1981-08-26
EP0018633B1 true EP0018633B1 (fr) 1983-05-11

Family

ID=6069797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102344A Expired EP0018633B1 (fr) 1979-05-02 1980-04-30 Poudre de coulée pour la coulée continue de l'acier

Country Status (6)

Country Link
US (1) US4248631A (fr)
EP (1) EP0018633B1 (fr)
JP (1) JPS55148715A (fr)
AT (1) ATE3251T1 (fr)
CA (1) CA1146760A (fr)
DE (2) DE2917763A1 (fr)

Families Citing this family (30)

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Publication number Priority date Publication date Assignee Title
MC1284A1 (fr) * 1979-06-11 1980-07-22 Daussan & Co Produit isolant granulaire et son procede de preparation
JPS5714496A (en) * 1980-06-27 1982-01-25 Kobe Steel Ltd Molten type flux for submerged arc welding
US4419131A (en) * 1981-05-14 1983-12-06 Mobay Chemical Corporation Flux for continuous casting
DE3236391C2 (de) * 1982-10-01 1992-05-27 Hans Joachim Dipl.-Ing. Eitel Gießpulver für den Stahlguß
US4447265A (en) * 1983-06-27 1984-05-08 Schwer John W Method and composition for foaming slag in electric arc furnace
JPS6037250A (ja) * 1983-08-10 1985-02-26 Kawasaki Steel Corp 鋼の連続鋳造用鋳型添加剤
DE3331046A1 (de) * 1983-08-29 1985-03-14 Wacker-Chemie GmbH, 8000 München Verfahren zum behandeln von silicium und ferrosilicium mit schlacke
GB8325438D0 (en) * 1983-09-22 1983-10-26 Foseco Int Fluxes for casting metals
JPS60127054A (ja) * 1983-12-15 1985-07-06 Nippon Steel Metal Prod Co Ltd 表面欠陥の少ない鋼の連続鋳造用湯面保護剤
US4528035A (en) * 1984-05-21 1985-07-09 Metro Materials Corporation Composition and process to create foaming slag cover for molten steel
US4581068A (en) * 1985-05-06 1986-04-08 Frank & Schulte Gmbh Shaped body for feeding cupola furnaces
US4624707A (en) * 1985-10-11 1986-11-25 Bethlehem Steel Corporation Continuous casting slag
AT394320B (de) * 1987-02-20 1992-03-10 Tisza Bela & Co Verfahren zur herstellung von granuliertem stranggiesspulver
JPH01186253A (ja) * 1988-01-21 1989-07-25 Nippon Steel Corp 連続鋳造用鋳型添加剤
AT404098B (de) * 1991-03-28 1998-08-25 Tisza Bela & Co Verfahren zur herstellung von granuliertem stranggiesspulver
WO1994019496A1 (fr) * 1993-02-23 1994-09-01 Laporte Group Australia Limited Composite metallurgique/d'isolation et son procede de fabrication
US5397379A (en) * 1993-09-22 1995-03-14 Oglebay Norton Company Process and additive for the ladle refining of steel
US6179895B1 (en) 1996-12-11 2001-01-30 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes
AT407057B (de) * 1996-12-19 2000-12-27 Voest Alpine Schienen Gmbh Profiliertes walzgut und verfahren zu dessen herstellung
DE10360508A1 (de) * 2003-12-22 2005-07-14 Refratechnik Holding Gmbh Rohstoffgranaliengranulat für feuerfeste Erzeugnisse sowie Verfahren zur Herstellung und Verwendung des Rohstoffgranaliengranulats
DE102004026443B3 (de) * 2004-05-29 2006-02-02 Stefanie Heller Isolierende Granulate für Anwendungen im Hochtemperaturbereich
RU2478590C1 (ru) * 2011-08-12 2013-04-10 Государственное образовательное учреждение высшего профессионального образования "Южно-Российский государственный технический университет (Новочеркасский политехнический институт)" Шлаковый плавень
CN103317111B (zh) * 2012-03-22 2016-06-29 宝山钢铁股份有限公司 一种低碳钢用无氟连铸保护渣
CN104588601A (zh) * 2015-02-14 2015-05-06 河南通宇冶材集团有限公司 高拉速宽厚板坯连铸结晶器保护渣
CN105021776B (zh) * 2015-07-28 2017-06-27 西安交通大学 一种生物质锅炉硅酸盐结渣趋势的判定方法
CN110306039B (zh) * 2019-06-17 2020-12-29 包头钢铁（集团）有限责任公司 一种控制含f球团矿还原膨胀率的球团矿生产方法
CN110465637A (zh) * 2019-08-13 2019-11-19 南京钢铁股份有限公司 一种耐磨钢用低碱度低碳中间包覆盖剂及其应用
CN111424135A (zh) * 2020-05-29 2020-07-17 攀钢集团攀枝花钢铁研究院有限公司 低成本耐磨钢的制备方法
CN112605355B (zh) * 2020-12-07 2022-01-14 西峡龙成冶金材料有限公司 一种重型异型坯专用连铸结晶器保护渣及其应用
CN112828253B (zh) * 2021-01-06 2022-08-16 鞍钢股份有限公司 一种高锰钢用连铸保护渣

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE873058A (fr) * 1978-12-22 1979-04-17 Centre Rech Metallurgique Perfectionnements aux procedes pour la coulee continue des metaux

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GB1061459A (en) * 1964-12-02 1967-03-15 Aluminium Lab Ltd Improvements in or relating to continuous casting of metals
DE1958537A1 (de) * 1969-11-21 1971-06-24 Eitel Hans Joachim Giesspulver fuer das Stranggiessen von Stahl
JPS51132113A (en) * 1973-12-03 1976-11-17 Sutoruberugu Gmbh Additions for continuous steel casting
US3959031A (en) * 1973-12-28 1976-05-25 Wacker-Chemie Gmbh Molten basic welding fluxes low in manganese and with low moisture sensitivity
CH573276A5 (fr) * 1974-01-29 1976-03-15 Concast Ag
US3964916A (en) * 1974-12-13 1976-06-22 Corning Glass Works Casting powder
JPS559925B2 (fr) * 1975-01-31 1980-03-13
JPS5194424A (en) * 1975-02-18 1976-08-19 Igatatenkazai oyobi sonoseizohoho
JPS51147432A (en) * 1975-06-13 1976-12-17 Nippon Steel Corp Powder additive for making ingot and for continuous casting
JPS5229683A (en) * 1975-09-01 1977-03-05 Masato Aiura Milling cutter
BE836777A (fr) * 1975-12-18 1976-04-16 Flux agglomere basique pour le soudage d'aciers ordinaires ou faiblement allies a haute teneur en ca o
DE2614957C3 (de) * 1976-04-07 1978-11-02 Hans Joachim Dipl.-Ing. Eitel Verfahren zur Herstellung von Gießpulver
BE849022A (fr) * 1976-12-02 1977-06-02 Poudre de couverture amelioree pour coulee continue des metaux
IT1105042B (it) * 1978-06-28 1985-10-28 Kempro Italiana Spa Procedimento per la produzione di una scoria sintetica granulare per la colata continua dell'acciaio e relativo prodotto ottenuto
US5992059A (en) * 1995-11-22 1999-11-30 Maven Golf Products Llc Tread insert for insertion into a shoe sole

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
BE873058A (fr) * 1978-12-22 1979-04-17 Centre Rech Metallurgique Perfectionnements aux procedes pour la coulee continue des metaux

Also Published As

Publication number Publication date
DE3063061D1 (en) 1983-06-16
EP0018633A3 (en) 1981-08-26
CA1146760A (fr) 1983-05-24
DE2917763A1 (de) 1980-11-13
EP0018633A2 (fr) 1980-11-12
ATE3251T1 (de) 1983-05-15
JPS55148715A (en) 1980-11-19
US4248631A (en) 1981-02-03
JPS577213B2 (fr) 1982-02-09

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