EP0012226B1 - Procédé pour le traitement d'acier contenant du bore - Google Patents

Procédé pour le traitement d'acier contenant du bore Download PDF

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Publication number
EP0012226B1
EP0012226B1 EP79104467A EP79104467A EP0012226B1 EP 0012226 B1 EP0012226 B1 EP 0012226B1 EP 79104467 A EP79104467 A EP 79104467A EP 79104467 A EP79104467 A EP 79104467A EP 0012226 B1 EP0012226 B1 EP 0012226B1
Authority
EP
European Patent Office
Prior art keywords
boron
steel
nitride
calcium
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
EP79104467A
Other languages
German (de)
English (en)
Other versions
EP0012226A1 (fr
Inventor
Fritz Willim
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.)
SMS Concast AG
Original Assignee
Concast Holding 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4377104&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0012226(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Concast Holding AG filed Critical Concast Holding AG
Priority to AT79104467T priority Critical patent/ATE591T1/de
Publication of EP0012226A1 publication Critical patent/EP0012226A1/fr
Application granted granted Critical
Publication of EP0012226B1 publication Critical patent/EP0012226B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C21C2007/0018—Boron

Definitions

  • the invention relates to a process for the treatment of boron-containing steel for continuous casting, in particular for casting in small formats with unregulated spout, elements such as calcium and boron being pre-deoxidized with manganese, silicon and optionally aluminum by means of a carrier gas.
  • Boron is known to increase the hardenability of the steel; it is about 10 to 100 times more effective than other elements.
  • the required deoxidation of the steel is achieved with large amounts of aluminum, whereby it must be ensured that enough aluminum remains in the steel even if the oxygen content was particularly high before the deoxidation.
  • the addition of titanium, zirconium or the like binds the nitrogen dissolved in the steel so stably that it can no longer react with the boron added.
  • standards for metallic steels of 0.020 to 0.040% are often prescribed for these steels, which means e.g. insensitivity to involuntary overheating during heat treatment, in particular during hardening, is sought.
  • a process for continuous casting in which various elements for deoxidizing, alloying, cooling, etc. are added as additives in powder form by means of a transport gas (oxidation, reduction or neutral gas) into a ladle and / or an intermediate container.
  • a transport gas oxygen, reduction or neutral gas
  • the problem of treating boron-containing steels, which should be particularly suitable for casting in small formats, is not dealt with.
  • the solution to this problem is characterized in that in the steel melt in the ladle, before being poured into the mold, by means of an inert carrier gas and in powder form, the calcium or a compound thereof, at least one element which forms stable nitrides at the steel melting temperature and boron or a boron compound introduced and the pouring jets from the pan into the intermediate container and from the intermediate container into the mold are protected from contact with the air.
  • the steel is pre-deoxidized in a known manner with deoxidizers such as manganese, silicon and aluminum.
  • deoxidizers such as manganese, silicon and aluminum.
  • the aim is to achieve a metallic aluminum content of the melt of approximately 0.010 to 0.020%.
  • Calcium is then blown into the pan in the form of CaSi or CaC 2 for further deoxidation and the oxygen dissolved in the steel is lowered to such an extent that oxidation of the boron subsequently added is essentially prevented.
  • the calcium also causes a reduction in the sulfur content and a favorable influence on the sulfides.
  • At least one element which forms nitrides and is stable at the steel melting temperature is also blown into the molten steel by means of a carrier gas, preferably argon.
  • a carrier gas preferably argon.
  • boron or a boron compound such as, for example, borax, ferroboron, nickel boron or ferrosilicon boron, is likewise fed in by means of a carrier gas in precisely metered amounts and likewise in powder form.
  • a uniform distribution is ensured by blowing the nitride-forming element and the boron or the boron compound in powder form into the steel melt located in the pan.
  • the pouring jets from the pan to the intermediate container and from the intermediate container into the continuous casting mold are protected from contact with the air.
  • This protection against direct contact with the air can be provided, for example, by known ceramic protective tubes or by using protective gas in a liquid or gaseous state. This prevents burn-off of the metal boron.
  • the steel thus treated in the order described now contains the small amounts of effective, i.e. metallic or acid-soluble boron.
  • a predeterminable application of boron within narrow limits is given.
  • the steel treated in this way is now used for the continuous casting of small formats, e.g. Billet, suitable, i.e. he can over free-running, not stopper-regulated and not oversized spouts, e.g. an intermediate container into which continuous casting molds are introduced.
  • This also applies if increased aluminum contents, e.g. 0.020 to 0.040% of metallic aluminum are prescribed.
  • Zircon and / or titanium or their alloys in powder form are advantageously introduced as the nitride-forming element. Their high affinity ensures an effective setting of nitrogen as nitride.
  • Calcium and zircon or titanium can also be added simultaneously, for example as a calcium-silicon-zirconium alloy and / or a calcium-silicon-titanium alloy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)

Claims (5)

1. Procédé pour le traitement d'acier contenant du bore en vue de la coulée continue, en particulier de la coulée sans régulation de barres de petits formats, selon lequel on ajoute des éléments tels que le calcium et le bore - au moyen d'un gaz porteur - un acier prédésoxydé au manganèse, au silicium et éventuellement à l'aluminium, caractérisé en ce que l'on introduit le calcium ou un de ses composé, au moins un élément formant des nitrures stables à la température de l'acier fondu, du bore ou un composé de bore, par un gaz porteur neutre et à l'état de poudre, dans l'acier fondu dans la poche, avant la coulée dans la lingotière, et l'on protège du contact avec l'air des jets de coulée de la poche dans le panier de coulée et du panier dans la lingotière.
2. Procédé selon la revendication 1, caractérisé en ce que l'on introduit du zirconium et/ou du titane, ou un de leurs alliages, comme élément formant des nitrures.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'on introduit un mélange ou un alliage de l'élément formant des nitrures, au bore ou d'un composé de bore dans l'acier fondu.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'on ajoute l'élément formant des nitrures, le bore ou le composé de bore par une lance.
5. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'on effectue l'addition par un tiroir.
EP79104467A 1978-11-17 1979-11-13 Procédé pour le traitement d'acier contenant du bore Expired EP0012226B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104467T ATE591T1 (de) 1978-11-17 1979-11-13 Verfahren zur behandlung von borhaltigem stahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH11811/78 1978-11-17
CH1181178 1978-11-17

Publications (2)

Publication Number Publication Date
EP0012226A1 EP0012226A1 (fr) 1980-06-25
EP0012226B1 true EP0012226B1 (fr) 1982-01-20

Family

ID=4377104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104467A Expired EP0012226B1 (fr) 1978-11-17 1979-11-13 Procédé pour le traitement d'acier contenant du bore

Country Status (12)

Country Link
US (1) US4251268A (fr)
EP (1) EP0012226B1 (fr)
JP (1) JPS6014810B2 (fr)
AR (1) AR217014A1 (fr)
AT (1) ATE591T1 (fr)
BR (1) BR7907238A (fr)
CA (1) CA1142761A (fr)
DE (1) DE2961903D1 (fr)
ES (1) ES8101123A1 (fr)
FI (1) FI793135A (fr)
TR (1) TR20525A (fr)
ZA (1) ZA795853B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4440568A (en) * 1981-06-30 1984-04-03 Foote Mineral Company Boron alloying additive for continuously casting boron steel
US4575912A (en) * 1984-05-07 1986-03-18 Ssab Svenskt Stal Ab Spring steel
DE3416952A1 (de) * 1984-05-08 1985-11-14 Elektroschmelzwerk Kempten GmbH, 8000 München Verfahren zur herstellung von mit bor legierten staehlen
JPS62184909U (fr) * 1986-05-15 1987-11-25
US6108932A (en) * 1998-05-05 2000-08-29 Steag Microtech Gmbh Method and apparatus for thermocapillary drying
TWI315347B (en) * 2002-03-28 2009-10-01 Nippon Steel Corp A high-purity ferroboron, a mother alloy for iron-base amorphous alloy, an iron-base amorphous alloy, and methods for producing the same
US7717976B2 (en) * 2004-12-14 2010-05-18 L&P Property Management Company Method for making strain aging resistant steel
CN103341595B (zh) * 2013-07-01 2015-09-16 广西大学 高硼铁基耐磨合金的长效变质剂及其配制工艺和使用方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2283299A (en) * 1940-07-31 1942-05-19 Molybdenum Corp Manufacture of steel
US2528867A (en) * 1948-06-28 1950-11-07 Carnegie Illinois Steel Corp Production of thermally hardenable boron-titanium steels
US2755181A (en) * 1952-10-09 1956-07-17 Air Liquide Process of introducing boron into ferrous metal
US2768892A (en) * 1955-05-26 1956-10-30 Jones & Laughlin Steel Corp Non-aging steel
DE1483619B2 (de) * 1965-01-11 1974-10-31 Paderwerk Gebr. Benteler, 4794 Schloss Neuhaus Stranggießen von beruhigtem Stahl
US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
GB1206062A (en) * 1967-10-18 1970-09-23 Nippon Kokan Kk Deoxidation method
US3840062A (en) * 1968-07-18 1974-10-08 M Kenney Continuous steel casting method
US3822735A (en) * 1969-07-11 1974-07-09 Nat Steel Corp Process for casting molten silicon-aluminum killed steel continuously
CA968999A (en) * 1969-11-19 1975-06-10 Concast Ag Low carbon steel adapted for continuous casting
DE2134180A1 (de) * 1971-07-09 1973-01-18 Ernst Brederhoff Verfahren zum einlegieren von titan in stahlschmelzen
US4129439A (en) * 1974-05-24 1978-12-12 Sumitomo Metal Industries, Ltd. Process for refining molten steel using ferroalloy
DE2527156B2 (de) * 1975-06-18 1980-09-04 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Vorbehandlung einer Stahlschmelze beim Stranggießen
DE2544947A1 (de) * 1975-09-30 1977-09-22 Thyssen Edelstahlwerke Ag Verfahren zur vermeidung von schuppenzeilen/haeutchen auf der oberflaeche von rost-, saeure- und hitzebestaendigen stahlbaendern
FR2339678A1 (fr) * 1976-01-28 1977-08-26 Ugine Aciers Aciers a caracteristiques mecaniques ameliorees par additions controlees de b, al et n

Also Published As

Publication number Publication date
ZA795853B (en) 1980-10-29
ES486598A0 (es) 1980-12-01
ES8101123A1 (es) 1980-12-01
TR20525A (tr) 1981-10-05
ATE591T1 (de) 1982-02-15
CA1142761A (fr) 1983-03-15
BR7907238A (pt) 1980-07-08
EP0012226A1 (fr) 1980-06-25
JPS5569214A (en) 1980-05-24
US4251268A (en) 1981-02-17
JPS6014810B2 (ja) 1985-04-16
AR217014A1 (es) 1980-02-15
DE2961903D1 (en) 1982-03-04
FI793135A (fi) 1980-05-18

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