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EP0316921B1 - Additif contenant du plomb pour des bains d'acier - Google Patents

Additif contenant du plomb pour des bains d'acier Download PDF

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Publication number
EP0316921B1
EP0316921B1 EP88119149A EP88119149A EP0316921B1 EP 0316921 B1 EP0316921 B1 EP 0316921B1 EP 88119149 A EP88119149 A EP 88119149A EP 88119149 A EP88119149 A EP 88119149A EP 0316921 B1 EP0316921 B1 EP 0316921B1
Authority
EP
European Patent Office
Prior art keywords
lead
steel
additive
lime
filled wire
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
EP88119149A
Other languages
German (de)
English (en)
Other versions
EP0316921A1 (fr
Inventor
Bernd Dr. Neuer
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg 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=6340760&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0316921(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SKW Trostberg AG filed Critical SKW Trostberg AG
Priority to AT88119149T priority Critical patent/ATE89325T1/de
Publication of EP0316921A1 publication Critical patent/EP0316921A1/fr
Application granted granted Critical
Publication of EP0316921B1 publication Critical patent/EP0316921B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • 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
    • C21C2007/0012—Lead

Definitions

  • the present invention relates to additives containing lead for the treatment of molten steel in the form of filled wires consisting of a metallic jacket and finely divided filler.
  • lead is used as an additive for steel treatment in order to improve the machining properties, with contents of typically 0.05 to 0.5% in the steel being set.
  • the lead additive extends the service life of the tools, optimizes chip formation because the chips break shorter and improves the surface quality of the workpiece.
  • lead practically does not dissolve in iron, there are considerable problems in practice in distributing the lead evenly in the molten steel.
  • the lead must be evenly distributed in the steel melt in the form of small droplets, this fine distribution also having to be retained until it solidifies. Lead droplets that are too large separate out due to their high specific weight and thus lead to an insufficient distribution of lead.
  • the lead is introduced with severe burn-off losses, which not only causes a corresponding environmental impact, but also an insufficient distribution of the lead in the steel melt.
  • Injection techniques such as cored wire technology can reduce burn-up losses, but first attempts with lead-filled hollow wires, as known, for example, from Revue de Métallurgie-CIT, 81 (1984) p.641-649, have shown that when these wires are wound into the molten steel, there was insufficient lead distribution in the steel. Relatively high lead concentrations at the start of casting and too low lead contents at the end of casting in the batches were regularly analyzed.
  • the present invention was therefore based on the object of developing a lead-containing additive for steel melts which does not have the disadvantages of the prior art mentioned, but rather enables uniform distribution and good application of the lead in the steel and, at the same time, safe handling and largely environmentally harmful emissions avoids.
  • the lead can be introduced into the steel in a safe, targeted and uniform manner.
  • the additive according to the present invention is in the form of a filled wire, consisting of a metallic sheath and a finely divided filler material which is sheathed by the sheath.
  • the jacket material should be selected so that it dissolves in the steel melt relatively quickly with the release of the treatment agent, without this jacket material or its residues introducing undesirable components into the steel melt. Unalloyed steel casings have proven to be the best.
  • the thickness of the jacket is usually 0.1 to 1 mm, preferably 0.2 to 0.6 mm.
  • the diameter of the entire cored wire can also be varied within wide limits, but a diameter range of 5 to 20 mm, preferably 9 to 13 mm, has proven to be particularly advantageous.
  • the filler material of the wire consists of two finely divided components, the first component consisting of metallic lead and / or alloys containing lead.
  • lead-containing alloys are to be understood as those alloys which predominantly consist of lead and which also contain other alloy components which do not adversely affect the material properties of the steel to be treated.
  • the lead or lead alloys should be in the most finely divided form possible, in order to pass into the smallest droplets during the treatment.
  • the particle size should expediently not be greater than 1 mm and preferably less than 0.8 mm.
  • the lead or lead alloys are preferably used in the form of small granules or beads.
  • the amount of lead per cored wire length unit depends on the diameter of the cored wire and varies between 100 and 1000 g per meter of cored wire.
  • the filler material of the wire consists of a calcareous material which spontaneously releases CO2 at the temperature of the molten steel (approx. 1550 to 1650 ° C) and also in finely divided form, i.e. with a particle size ⁇ 1 mm.
  • limestone or unburned dolomite can be used as a calcareous material. Finely divided limestone or dolomite occurs as a by-product in the large-scale production of burnt lime or dolomite and is therefore used in a meaningful way.
  • diamide lime which is produced in the industrial production of dicyandiamide from calcium cyanamide and essentially consists of particularly finely divided calcium carbonate (particle size approx. 90% ⁇ 60 ⁇ ), has proven to be particularly advantageous. Precisely because of its fineness, it is particularly suitable for the purpose according to the invention.
  • the amount of CO2-releasing, calcareous material used depends on the size of the batches to be treated and varies between 3 and 30% by weight based on the weight of the lead or lead alloy (s) used.
  • the production of the cored wire according to the invention is unproblematic and is carried out using customary methods and methods.
  • the finely divided filler material is mixed intensively, then filled into the wires, which are closed by folding or HF welding and then wound up on coils.
  • the steel treatment with the additive according to the invention can be carried out safely and without problems.
  • the wire is added to the ladles before casting. According to the desired lead analysis in steel, 0.1 to 10 kg of cored wire is used per ton of molten steel to be treated, a winding speed of 50 to 180 m / minute, preferably 100 to 120 m / minute, having proven successful.

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)

Claims (13)

  1. Additif contenant du plomb pour des bains d'acier, sous forme d'un fil métallique fourré composé d'une gaine métallique et d'une matière de remplissage finement divisée, caractérisé en ce que la matière de remplissage finement divisée est constituée par
    a) du plomb métallique et/ou des alliages de plomb, et
    b) une matière contenant de la chaux et libérant du CO₂ à la température du bain d'acier.
  2. Additif selon la revendication 1, caractérisé en ce que la gaine métallique est formée d'acier non allié.
  3. Additif selon la revendication 1 ou 2, caractérisé en ce que la gaine métallique a une épaisseur de 0,1 à 1 mm, de préférence de 0,2 à 0,6 mm.
  4. Additif selon l'une des revendications 1 à 3, caractérisé en ce que le fil métallique fourré a un diamètre de 5 à 20 mm, de préférence de 9 à 13 mm.
  5. Additif selon l'une des revendications 1 à 4, caracctérisé en ce que la matière de remplissage a une taille de particules qui ne dépasse pas 1 mm.
  6. Additif selon l'une des revendications 1 à 5, caractérisé en ce que le fil métallique fourré contient de 100 à 1000 g de plomb par mètre.
  7. Additif selon l'une des revendications 1 à 6, caractérisé en ce que la matière contenant de la chaux et libérant du CO₂ est constituée de calcaire ou de dolomie non cuite.
  8. Additif selon l'une des revendications 1 à 6, caractérisé en ce que la matière contenant de la chaux et libérant du CO₂ est constituée de chaux de diamide.
  9. Additif selon l'une des revendications 1 à 8, caractérisé en ce qu'on utilise la matière contenant de la chaux en une quantité de 3 à 30 % en poids par rapport au poids de plomb utilisé ou de l'alliage (des alliages) de plomb utilisé(s).
  10. Procédé de traitement de bains d'acier avec un additif contenant du plomb, caractérisé en ce qu'on introduit comme additif dans le bain un fil métallique fourré selon l'une des revendications 1 à 9.
  11. Procédé selon la revendication 10, caractérisé en ce qu'on introduit 0,1 à 10 kg de fil métallique fourré par tonne de bain d'acier à traiter.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce qu'on dévide le fil métallique fourré dans le bain d'acier à une vitesse de 50 à 180 m/minute, en particulier de 100 à 120 m/minute.
  13. Utilisation d'un fil métallique fourré selon l'une des revendications 1 à 9 comme additif contenant du plomb pour des bains d'acier.
EP88119149A 1987-11-19 1988-11-17 Additif contenant du plomb pour des bains d'acier Expired - Lifetime EP0316921B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119149T ATE89325T1 (de) 1987-11-19 1988-11-17 Bleihaltiges zusatzmittel fuer stahlschmelzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873739154 DE3739154A1 (de) 1987-11-19 1987-11-19 Bleihaltiges zusatzmittel fuer stahlschmelzen
DE3739154 1987-11-19

Publications (2)

Publication Number Publication Date
EP0316921A1 EP0316921A1 (fr) 1989-05-24
EP0316921B1 true EP0316921B1 (fr) 1993-05-12

Family

ID=6340760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119149A Expired - Lifetime EP0316921B1 (fr) 1987-11-19 1988-11-17 Additif contenant du plomb pour des bains d'acier

Country Status (6)

Country Link
US (1) US4892580A (fr)
EP (1) EP0316921B1 (fr)
JP (1) JP2760817B2 (fr)
AT (1) ATE89325T1 (fr)
BR (1) BR8806056A (fr)
DE (2) DE3739154A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10236354B4 (de) * 2002-08-08 2005-06-09 Goldschmidt Ag Verfahren zur Behandlung von Stahlschmelzen
KR101153780B1 (ko) * 2004-02-11 2012-06-13 타타 스틸 리미티드 강철 용해 과정에 있어서 코어드 와이어 주입 방법
US20060205974A1 (en) * 2005-03-08 2006-09-14 Lavoie Gino G Processes for producing aromatic dicarboxylic acids
SK500572009A3 (sk) * 2007-05-17 2010-03-08 Affival, Inc. Zariadenie na privádzanie legovacích prímesí a spôsob privádzania legovacej prímesi do roztaveného kovu
US20080314201A1 (en) * 2007-05-17 2008-12-25 Marzec Gregory P Enhanced Alloy Recovery In Molten Steel Baths Utilizing Cored Wires Doped With Dispersants
FR2917096B1 (fr) * 2007-06-05 2011-03-11 Affival Nouvel additif comprenant du plomb et/ou un alliage de plomb destine a traiter les bains d'acier liquide.
JP5326243B2 (ja) * 2007-09-05 2013-10-30 新日鐵住金株式会社 溶鋼への鉛の添加方法
EP4477767A1 (fr) 2022-02-11 2024-12-18 Instituto Hercílio Randon Prémélange contenant des nanoparticules, utilisation d'un prémélange contenant un véhicule et des nanoparticules, procédé d'incorporation de nanoparticules dans un matériau matriciel et un métal
BR102022010926A2 (pt) 2022-06-03 2023-12-19 Inst Hercilio Randon Ferro fundido melhorado e processo para sua obtenção

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2259342A (en) * 1940-04-17 1941-10-14 Inland Steel Co Method of adding lead to steel
DE829802C (de) * 1950-05-31 1952-01-28 Dr Aloys Wuestefeld Verfahren zur Entschwefelung und Desoxydation von Eisen- und Metallschmelzen sowie zur Erzeugung von sphaerolithischem Gusseisen
US3313620A (en) * 1963-02-18 1967-04-11 E I Te R S P A Elettochimica I Steel with lead and rare earth metals
JPS4824607B1 (fr) * 1969-10-04 1973-07-23
FR2085306A1 (en) * 1970-04-08 1971-12-24 Loire Atel Forges Auxiliary appts for ingot moulds - enabling introduction of solid additives
AT317274B (de) * 1970-12-28 1974-08-26 Steirische Gussstahlwerke Verfahren zur Herstellung bleihaltiger Stähle
FR2476542B1 (fr) * 1980-02-26 1983-03-11 Vallourec
US4389249A (en) * 1982-04-22 1983-06-21 Inland Steel Company Method for adding ingredient to steel as shot
JPS5992151A (ja) * 1982-11-18 1984-05-28 Sumitomo Metal Ind Ltd 連続鋳造法による鉛快削鋼の製造方法
JPS59157215A (ja) * 1983-02-26 1984-09-06 Nippon Steel Corp 炭酸カルシウムを活用する鉛含有溶鋼の溶製方法
FR2594850A1 (fr) * 1986-02-24 1987-08-28 Vallourec Produit composite a enveloppe tubulaire, contenant une matiere compactee, pour le traitement des metaux liquides, et procede de realisation de ce produit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Cahiers d'Informations Techniques de la Revue de Métallurgie, 81 (1984), no. 8/9, Paris, France, "Utilisation du fil fourré dans la métallurgie en poche", S. 641-649 *

Also Published As

Publication number Publication date
US4892580A (en) 1990-01-09
DE3739154A1 (de) 1989-06-01
DE3880972D1 (de) 1993-06-17
ATE89325T1 (de) 1993-05-15
JPH01162716A (ja) 1989-06-27
BR8806056A (pt) 1989-08-08
JP2760817B2 (ja) 1998-06-04
EP0316921A1 (fr) 1989-05-24

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