EP0931839A1 - Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad - Google Patents

Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad Download PDF

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Publication number
EP0931839A1
EP0931839A1 EP97640002A EP97640002A EP0931839A1 EP 0931839 A1 EP0931839 A1 EP 0931839A1 EP 97640002 A EP97640002 A EP 97640002A EP 97640002 A EP97640002 A EP 97640002A EP 0931839 A1 EP0931839 A1 EP 0931839A1
Authority
EP
European Patent Office
Prior art keywords
production process
process characterized
ingots
pocket
purity
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.)
Withdrawn
Application number
EP97640002A
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English (en)
French (fr)
Inventor
Marco Astori
Giorgio Ferretti
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.)
ASO SIDERURGICA S.R.L.
Original Assignee
SNC Astori Et Ferretti Oti Etincelle
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 SNC Astori Et Ferretti Oti Etincelle filed Critical SNC Astori Et Ferretti Oti Etincelle
Priority to EP97640002A priority Critical patent/EP0931839A1/de
Publication of EP0931839A1 publication Critical patent/EP0931839A1/de
Withdrawn legal-status Critical Current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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag

Definitions

  • the invention relates to an industrial production process for the manufacture of ingots for Forged irons of large size and very high purity and homogeneity of analysis (eg for example, turbine rotors, etc.); this process makes it possible to use as raw material scrap recovery.
  • industrial production process for the manufacture of ingots for Forged irons of large size and very high purity and homogeneity of analysis (eg for example, turbine rotors, etc.); this process makes it possible to use as raw material scrap recovery.
  • This system makes it possible to obtain ingots of very high purity, even of large size, capable of meet the rigorous specifications required for the production of forged irons from high end (rotors for energy production, etc.) with 30% longer cycle time short, a unit cost of manufacturing 30% cheaper and a production increased by 20% to equal installation cost.
  • the scrap yard the starting point of departure, will have to be controlled so that each category of scrap has its precise location; way card, each charging basket can be filled according to the weight and the mixtures that one wants to obtain.
  • each scrap category it will be necessary to fix the specific energy consumption required for merge in order to program the oven computer according to the necessary times and power without cause overheating. This will allow the liquid steel to absorb less gas.
  • For obtain a correct fusion it is necessary to calculate the energy losses caused by the aspiration of the fumes.
  • the steel When the fusion is complete, the steel will have to be transferred from the oven to the pocket by means of an installation having the same shape and dimensions as that in Figure 2, able to avoid the passage of oxidized slag in the oven.
  • the control of the slag in the pocket will have to be done by means of an online system, using an X-ray fluorescense equipment that will use the attached analytical curves (see Fig. 3-4-5-6-7-8-9-10).
  • the pocket shall have the same shape and dimensions as shown in Figures 11 and 12, with porous partitions on the bottom for the insufflation of argon and with a coating of basic refractory bricks, having a high mechanical resistance and conforming characteristics.
  • the gas treatment can not mix the liquid steel mass in a homogeneous way (control reach) and create the ascending flow of inclusions and preserve its vacuum efficiency if the arrangement of the porous partitions with respect to the taphole respects a shape geometrically defined and appropriate to ensure correct gas flow (fig.12).
  • the metallurgical process will be completed by the application of the vacuum at levels can not produce harmful chemical reactions to the purity of the steel to be produced, and by Argon insufflation according to the flow pressure parameters set in Figure 14 to through the porous partitions positioned in the bottom of the pocket according to a precise geometry indicated in detail C of FIG. 12. During this degassing phase, the hydrogen and the sulfur will be reduced to very low levels.
  • the hydrogen content may decrease below the value of 1 p.p.m., while thanks to a particular vacuum level nitrogen may drop to levels very close to the solubility levels of alloy steel (20-30 p.p.m.) (see Figures 13 -13A).
  • the pouring basin should be made of refractory bricks with high characteristics and the must be done by means of special equipment (see Fig. 15) in order to obtain perfect fixtures and excellent cleaning of the pouring channels and ingot molds for avoid the imprisonment of exogenous inclusions during casting. If we respect the parameters of temperature and casting, it will be possible to obtain the perfect centering of the steel jet on the casting column thus reducing refractory bricks wear to a minimum.
  • an appropriate procedure will regulate the holding time of the ingots in the mold to allow, before any displacement, the correct rise of the inclusions in the head and perfect solidification.
  • the ingots, still hot, can be put in the furnaces for the treatments thermal requirements.
EP97640002A 1997-12-24 1997-12-24 Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad Withdrawn EP0931839A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97640002A EP0931839A1 (de) 1997-12-24 1997-12-24 Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97640002A EP0931839A1 (de) 1997-12-24 1997-12-24 Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad

Publications (1)

Publication Number Publication Date
EP0931839A1 true EP0931839A1 (de) 1999-07-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97640002A Withdrawn EP0931839A1 (de) 1997-12-24 1997-12-24 Verfahren zur Herstellung von Stahlblöcken mit einem hohen Reinheitsgrad

Country Status (1)

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EP (1) EP0931839A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903444C1 (en) * 1989-02-06 1990-02-15 Kloeckner Stahl Gmbh Method and apparatus for transporting liquid metal from a metallurgical furnace to a casting vessel
EP0382701A1 (de) * 1989-02-06 1990-08-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Vorrichtung um das Mitlaufen von Schlacke zu verhindern
AT391367B (de) * 1987-10-05 1990-09-25 Radex Austria Ag Ausgussrohr fuer metallschmelzen aus metallurgischen oefen und gefaessen
WO1992018818A1 (en) * 1991-04-16 1992-10-29 Forgemasters Steels Limited Taphole design and pouring method
WO1994025631A1 (fr) * 1993-04-30 1994-11-10 Paul Wurth S.A. Trou de coulee pour un four a cuve, notamment un haut-fourneau
DE19621143A1 (de) * 1996-01-31 1997-08-07 Mannesmann Ag Verfahren zur Erzeugung nichtrostender Stähle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391367B (de) * 1987-10-05 1990-09-25 Radex Austria Ag Ausgussrohr fuer metallschmelzen aus metallurgischen oefen und gefaessen
DE3903444C1 (en) * 1989-02-06 1990-02-15 Kloeckner Stahl Gmbh Method and apparatus for transporting liquid metal from a metallurgical furnace to a casting vessel
EP0382701A1 (de) * 1989-02-06 1990-08-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Vorrichtung um das Mitlaufen von Schlacke zu verhindern
WO1992018818A1 (en) * 1991-04-16 1992-10-29 Forgemasters Steels Limited Taphole design and pouring method
WO1994025631A1 (fr) * 1993-04-30 1994-11-10 Paul Wurth S.A. Trou de coulee pour un four a cuve, notamment un haut-fourneau
DE19621143A1 (de) * 1996-01-31 1997-08-07 Mannesmann Ag Verfahren zur Erzeugung nichtrostender Stähle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"ADVANTAGES OF A SLIDE GATE VALVE FOR CONTROL OF TAPPING", STEEL TIMES - INCORPORATING IRON & STEEL, vol. 223, no. 5, 1 May 1995 (1995-05-01), pages E15/16, XP000511019 *

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