EP0309781A1 - Procédé pour ajouter des additifs volatils et fusibles dans des alliages ferreux fondus et dispositif pour sa réalisation - Google Patents

Procédé pour ajouter des additifs volatils et fusibles dans des alliages ferreux fondus et dispositif pour sa réalisation Download PDF

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Publication number
EP0309781A1
EP0309781A1 EP88114526A EP88114526A EP0309781A1 EP 0309781 A1 EP0309781 A1 EP 0309781A1 EP 88114526 A EP88114526 A EP 88114526A EP 88114526 A EP88114526 A EP 88114526A EP 0309781 A1 EP0309781 A1 EP 0309781A1
Authority
EP
European Patent Office
Prior art keywords
bell
submersible
modifying
additives
opening
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.)
Ceased
Application number
EP88114526A
Other languages
German (de)
English (en)
Inventor
Jaroslav Dipl.-Ing. Polak Csc
Vladimir Pospisil
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.)
ZAVODY TEZKEHO STROJIRENSTVI KOMBINAT KOMBINATNI PODNIK
Original Assignee
ZAVODY TEZKEHO STROJIRENSTVI KOMBINAT KOMBINATNI PODNIK
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 ZAVODY TEZKEHO STROJIRENSTVI KOMBINAT KOMBINATNI PODNIK filed Critical ZAVODY TEZKEHO STROJIRENSTVI KOMBINAT KOMBINATNI PODNIK
Publication of EP0309781A1 publication Critical patent/EP0309781A1/fr
Ceased 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • the invention relates to a method for adding vaporizable and fusible additives in molten iron alloys in a preparation pan in a pressure chamber of an autoclave, these additives being accommodated in a submersible modifying bell which is placed in the melt for the production of spherulitic cast iron or cast iron with vermicular graphite or of magnesium-modified cast iron and / or for the production of master alloys with magnesium and with cerium and / or for desulfurization and for the deoxidation of the iron alloys, and on a device for carrying it out.
  • the metallic magnesium is fastened on a rod and either immersed bare or provided with insulation layers which prevent heating and evaporation, refining additives are thrown into the pan freely, or submersible modification bells of various constructions of different materials and designs are used, in which the additives are inserted.
  • the level of utilization of the magnesium and the other additives and the reproducibility of these values and therefore also the manufacturing quality are different.
  • the invention has for its object to overcome some of the disadvantages listed above to develop a method and a device of the type assumed at the outset, which the optimal conditions for the course of the technological process, i. H. for the maximum utilization of all additives, for the optimal mixing of the additives with the melt and the improvement of the controllability of the process and its reproducibility.
  • the main advantages of the method and the device according to the invention are that the perfect conditions for the course of the whole technological process are achieved, that is to say that the maximum utilization of all additives is made possible, that the best mixing of the additives with the melt is ensured that the controllability of the whole process is improved and that its very good reproducibility is made possible. Evaporation is also ensured at the optimum speed, and for the provision of the maximum utilization of the additives in the melt, the duration of the lowering of the submersible modifying bell to the lowest position in the preparation pan is selected to be equal to or less than three seconds, because the additives are thus passed through run through the melt more quickly before it heats up to the evaporation temperature so that it does not evaporate when the submersible modifying bell is immersed.
  • the bottom of the submersible modification bell should not be more than 50 mm away from the bottom of the processing pan in this process. This causes the additives to evaporate in the lowest position and the longest path of the gasified magnesium, decomposition and refining substances through the metal is used. Furthermore, the parallel modification and refining of the metal alloy are ensured.
  • the modification process creates a significant amount of Magnesium and reaction products. For example, it is MgO, MgS, Mg-Mn-Fe silicates which, if they penetrate into the castings, reduce their mechanical and other properties and can lead to rejects.
  • the bell size must therefore be such that it contains all the necessary additives for the fulfillment of the modification, but no unnecessary large spaces are created, where too much metal penetrates when immersed, which heats the contents prematurely to the evaporation temperatures. Even in the further modification process, it is not desirable for the submersible modification bell to have unnecessarily large spaces which lead to considerable metal accumulation and an undesirable acceleration of reaction.
  • the size of the submersible modifying bell can therefore function correctly if it is in a certain ratio to the size of the autoclave pressure chamber. This makes it possible to control the modification process and to achieve good and reproducible results.
  • the sizes of the openings for the metal entry into the submersible modifying bell and for the escape of the gas products are chosen so that the whole process takes place with a certain intensity and can be easily regulated.
  • the total area of the lower openings be larger than the total area of the upper openings because this creates a lower resistance to vapor escape from the submersible modifying bell into the metal in the lower openings.
  • the inclination of the lower openings with their inner ends towards the floor also helps the gas to enter the metal as far down as possible.
  • the openings in the jacket of the submersible modifying bell are inclined with their outer ends towards the bottom of the submersible modifying bell in such a way that no gas cushion is formed there which does not allow metal penetration to the bottom and the additional melting, whereby it is guaranteed that the gases escaping here will fully participate in the modification process and the intense metal swirl.
  • the modifying pan is proposed to be relatively slim, that is, with the inside diameter of the bottom Preparation pan to the inside diameter of the submersible modifying bell in a ratio of 2: 1 to 4: 1.
  • the upper transverse part of the submersible modifying bell is provided with a through opening for a metal holding rod and with a concentric widening. A tube of refractory material is inserted into this, and the entire tube is sealed so that the metal holding rod is protected until it is completely immersed in contact with the molten metal.
  • the rod holder in the inner part of the submersible modification bell is also protected by a protective lug filling.
  • the insulation capacity of this fire-resistant protection is chosen so that the rod withstands the immersion, buoyancy and vibrations and that it also withstands the bending stress caused by the total weight of the filling of the submersible modifying bell clamped in the horizontal position. In this position, the submersible modifying bell can be filled.
  • the submersible modification bell 1 is suspended from the metal holding rod 3, which is held in the protective tube 2. This protective tube 2 passes through the cover of the pressure chamber 6 of the autoclave.
  • the submersible modifying bell 1 is provided in the upper transverse part with a through opening for the metal holding rod 3 and a concentric upper blind opening for the protective tube 2, the lower end of the metal holding rod 3 together with its fastening element, which, for. B. is formed by a nut, in the inner region of the upper cross part of the submersible modifying bell 1 is covered with a protective approach filling 7.
  • the submersible modification bell 1 is provided with at least one, but advantageously with a whole series of upper openings 5 and lower openings 4.
  • lower openings 4 and upper openings 5 are arranged on the one hand in different generatrices of the submersible modifying bell 1, which means that they are not arranged one above the other, and on the other hand they are designed inclined, the upper openings 5 to the bottom of the submersible modifying bell 1 with their interior End are inclined and the lower openings 4 are inclined to the bottom of the submersible modifying bell 1 with its outer end.
  • the ratio of the total area of the lower openings 4 and upper openings 5 to the inner volume of the submersible modifying bell 1 is from 1: 100 to 1: 200, and the effective height V ef between the lower openings 4 and the upper openings 5 is the same to or less than the inner diameter D n of the submersible modifying bell 1.
  • the openings mentioned are also advantageous to arrange the openings mentioned so that the total area of the lower openings 4 is equal to or larger than the total area of the upper openings 5 of the submersible modifying bell 1 is.
  • the preparation pan 8 is arranged, into which the submersible modifying bell 1 can be inserted, the ratio of the effective volume of the submersible modifying bell 1 to the volume of the pressure chamber 6 has the value 2 to 4: 1000 and advantageously the ratio of the inside diameter of the bottom of the processing pan 8 to the inside diameter D n of the submersible modification bell 1 has the value 2: 1 to 4: 1.
  • the submersible modifying bell 1 which with the associated vaporizable or fusible additive, for. B. is filled with magnesium, is lowered by means of the metal holding rod 3 into the processing pan 8, the required pressure prevailing in the pressure chamber 6 of the autoclave.
  • the lowering duration of the submersible modifying bell 1 to the lowest position in the preparation pan 8 is chosen to be equal to or less than three seconds, because the additives are so caused by the melt go through before they heat up to the evaporation temperature so that they do not evaporate when immersing the submersible modifying bell 1.
  • the bottom of the submersible modifying bell 1 should not be more than 50 mm from the bottom of the processing pan 8. As a result, the additional evaporation starts in the lowest position, and so the longest path of the gasified magnesium, decomposition and refining substances through the metal is used.
  • the submersible Modification Bell 1 is after the completion of Processing process pulled out of the melt and filled in the pressure chamber 6 of the autoclave with a new additional dose, whereby it is prepared for repeated use. The filling is carried out regularly in the horizontal position of the submersible modification bell 1.
EP88114526A 1987-09-24 1988-09-06 Procédé pour ajouter des additifs volatils et fusibles dans des alliages ferreux fondus et dispositif pour sa réalisation Ceased EP0309781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS6868/87 1987-09-24
CS876868A CS265400B1 (en) 1987-09-24 1987-09-24 Process for adding evaporable and meltable additives in melt ferrous alloys and device for making this process

Publications (1)

Publication Number Publication Date
EP0309781A1 true EP0309781A1 (fr) 1989-04-05

Family

ID=5416696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114526A Ceased EP0309781A1 (fr) 1987-09-24 1988-09-06 Procédé pour ajouter des additifs volatils et fusibles dans des alliages ferreux fondus et dispositif pour sa réalisation

Country Status (6)

Country Link
EP (1) EP0309781A1 (fr)
CS (1) CS265400B1 (fr)
FI (1) FI884199A (fr)
NO (1) NO884241L (fr)
PL (1) PL274861A1 (fr)
YU (1) YU170588A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5714117A (en) * 1996-01-31 1998-02-03 Iowa State University Research Foundation, Inc. Air melting of Cu-Cr alloys

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1939140A1 (de) * 1968-08-14 1970-02-19 Allegheny Ludlum Steel Vorrichtung zum Zugeben von Stoffen zu einem Gefaess mit geschmolzenem Metall
GB1191563A (en) * 1967-05-09 1970-05-13 Ct De Rech S De Pont A Mousson Improvements in or relating to a Process for Treating Cast Iron and a Product for Carrying Out Said Process.
FR2189525A1 (fr) * 1972-06-21 1974-01-25 Foseco Int
WO1979000481A1 (fr) * 1978-01-06 1979-07-26 Fischer Ag Procede, dispositif et moyen pour le traitement de fer en fusion avec un metal alcalin ou un metal alcalino-terreux
EP0041680A1 (fr) * 1980-06-10 1981-12-16 Klöckner-Humboldt-Deutz Aktiengesellschaft Dispositif pour introduire des additifs très réactifs dans un bain de métal fondu

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1191563A (en) * 1967-05-09 1970-05-13 Ct De Rech S De Pont A Mousson Improvements in or relating to a Process for Treating Cast Iron and a Product for Carrying Out Said Process.
DE1939140A1 (de) * 1968-08-14 1970-02-19 Allegheny Ludlum Steel Vorrichtung zum Zugeben von Stoffen zu einem Gefaess mit geschmolzenem Metall
FR2189525A1 (fr) * 1972-06-21 1974-01-25 Foseco Int
WO1979000481A1 (fr) * 1978-01-06 1979-07-26 Fischer Ag Procede, dispositif et moyen pour le traitement de fer en fusion avec un metal alcalin ou un metal alcalino-terreux
EP0041680A1 (fr) * 1980-06-10 1981-12-16 Klöckner-Humboldt-Deutz Aktiengesellschaft Dispositif pour introduire des additifs très réactifs dans un bain de métal fondu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5714117A (en) * 1996-01-31 1998-02-03 Iowa State University Research Foundation, Inc. Air melting of Cu-Cr alloys

Also Published As

Publication number Publication date
NO884241D0 (no) 1988-09-23
PL274861A1 (en) 1989-05-30
CS686887A1 (en) 1989-02-10
FI884199A (fi) 1989-03-25
CS265400B1 (en) 1989-10-13
YU170588A (en) 1990-04-30
NO884241L (no) 1989-03-28
FI884199A0 (fi) 1988-09-13

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