EP0302049A1 - Procédé de traitement thermique de fontes malléables - Google Patents

Procédé de traitement thermique de fontes malléables Download PDF

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Publication number
EP0302049A1
EP0302049A1 EP88890197A EP88890197A EP0302049A1 EP 0302049 A1 EP0302049 A1 EP 0302049A1 EP 88890197 A EP88890197 A EP 88890197A EP 88890197 A EP88890197 A EP 88890197A EP 0302049 A1 EP0302049 A1 EP 0302049A1
Authority
EP
European Patent Office
Prior art keywords
temperature
castings
cooled
cast iron
annealing
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Withdrawn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
EP88890197A
Other languages
German (de)
English (en)
Inventor
Gerhard Dr. Dipl.-Ing. Löcker
Klaus Dr. Dipl.-Ing. Maier
Walter Dipl.-Ing. Malzacher
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.)
Fittings Traisen GmbH
Original Assignee
Fittings Traisen GmbH
Voestalpine Stahl GmbH
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 Fittings Traisen GmbH, Voestalpine Stahl GmbH filed Critical Fittings Traisen GmbH
Publication of EP0302049A1 publication Critical patent/EP0302049A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C21D5/04—Heat treatments of cast-iron of white cast-iron
    • C21D5/06—Malleabilising
    • C21D5/08—Malleabilising with oxidation of carbon
    • C21D5/10—Malleabilising with oxidation of carbon in gaseous agents

Definitions

  • the invention relates to a method for the heat treatment of malleable cast iron in a continuous gas tempering furnace.
  • a decarburizing annealing must be carried out for the production of white malleable cast iron, the known processes providing such a decarburizing annealing in furnaces which can be fed both continuously and discontinuously.
  • the annealing treatment for the production of white malleable cast iron it is known to heat the castings to temperatures between 950 ° and 1070 ° C. and to keep them at this temperature for a longer period of time for the purpose of falling cement and the necessary decarburization.
  • rapid cooling to room temperature can have no appreciable influence on the mechanical properties by the structure caused.
  • decarburization is carried out in addition to the primary carbide decomposition in the case of white malleable cast iron within the holding period at which the castings are kept at temperatures of 1070 ° C.
  • the length of the holding period depends essentially on the wall thickness of the castings and the desired degree of decarburization. Usually, hold times of about 40 hours are observed for castings with a maximum wall thickness of 6 mm and hold times of up to 80 hours for thick-walled castings.
  • a starting analysis of approximately 2.0 to 3.5% carbon, 0.5 to 1.7% silicon, 0.3 to 1% manganese, remainder iron and steel companion is assumed as the starting material, the sulfur content being up to 0. Can be 30%.
  • the sulfur content depends primarily on the smelting unit used. The sulfur content is mostly introduced via the energy source.
  • the present invention now aims to provide a method of the type mentioned in the introduction, in which with relatively short annealing times in continuous gas tempering furnaces it is found that the risk of deformation is reduced. Furthermore, the invention aims to achieve castings with higher toughness with sufficient strength.
  • the process according to the invention essentially consists in decarburizing the castings in a continuous gas annealing furnace at a temperature of 1000 ° C. to 1100 ° C. and keeping them at this temperature until the cement heater falls completely, then accelerating to 730 ° C.
  • the annealing time can therefore, as corresponds to a preferred embodiment of the method according to the invention, be limited to a holding time of 4 to 10 hours at high temperature, preferably 5 to 6 hours.
  • the annealing temperature is chosen between 1050 ° C. and 1100 ° C. In this temperature range, it is found that the glow times are particularly short until the cement heater falls.
  • the cooling rate of 3 ° C / h to 4 ° C / h is preferably selected and in particular the slow cooling to a temperature of 690 ° C to 700 ° C and then cooled with air to room temperature.
  • the casting process is advantageously carried out in such a way that Al and / or boron or Zr is added to the melt for the production of the castings.
  • Al and / or boron or Zr is added to the melt for the production of the castings.
  • particularly favorable physical properties of the castings have also resulted after the temperature treatment according to the invention.
  • the method according to the invention is particularly suitable for the heat treatment of fittings, so that the invention also relates to the use of this method for the heat treatment of fittings.
  • the risk of deformation during heat treatment, in which an annealing treatment is carried out at relatively high temperatures, is particularly great, and the relatively short Annealing time reduces the scrap usually caused by the annealing treatment for fittings.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP88890197A 1987-07-27 1988-07-27 Procédé de traitement thermique de fontes malléables Withdrawn EP0302049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1901/87 1987-07-27
AT190187A AT391878B (de) 1987-07-27 1987-07-27 Verfahren zur waermebehandlung von temperguss

Publications (1)

Publication Number Publication Date
EP0302049A1 true EP0302049A1 (fr) 1989-02-01

Family

ID=3523468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88890197A Withdrawn EP0302049A1 (fr) 1987-07-27 1988-07-27 Procédé de traitement thermique de fontes malléables

Country Status (7)

Country Link
EP (1) EP0302049A1 (fr)
AT (1) AT391878B (fr)
BR (1) BR8803713A (fr)
HU (1) HUT50882A (fr)
PL (1) PL273903A1 (fr)
PT (1) PT88105A (fr)
YU (1) YU46472B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2153010C1 (ru) * 1999-05-20 2000-07-20 Балтийский государственный технический университет "Военмех" им.Д.Ф.Устинова Способ термической обработки литой заготовки из ковкого чугуна при наличии в его структуре "отбела"
CN113403458A (zh) * 2021-06-23 2021-09-17 唐山鑫业科技有限公司 白心可锻铸铁生产工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956234A (fr) * 1950-01-27
DE872352C (de) * 1950-06-03 1953-03-30 Bergische Stahlindustrie Aus Temperguss bestehende Formteile, die unabhaengig von ihrer Wandstaerke durch Schmelzschweissen gut schweissbar sind
GB897159A (en) * 1960-05-23 1962-05-23 Matthias Ludwig Improvements in and relating to the production of high-grade malleable iron castings
CH413544A (de) * 1959-03-16 1966-05-15 Pfaudler Permutit Inc Verfahren zur Herstellung eines emaillierten Gegenstandes aus duktilem Gusseisen
CH485023A (fr) * 1967-04-05 1970-01-31 Renault Procédé de fabrication d'une pièce en fonte malléable et pièce en fonte malléable obtenue par ce procédé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956234A (fr) * 1950-01-27
DE872352C (de) * 1950-06-03 1953-03-30 Bergische Stahlindustrie Aus Temperguss bestehende Formteile, die unabhaengig von ihrer Wandstaerke durch Schmelzschweissen gut schweissbar sind
CH413544A (de) * 1959-03-16 1966-05-15 Pfaudler Permutit Inc Verfahren zur Herstellung eines emaillierten Gegenstandes aus duktilem Gusseisen
GB897159A (en) * 1960-05-23 1962-05-23 Matthias Ludwig Improvements in and relating to the production of high-grade malleable iron castings
CH485023A (fr) * 1967-04-05 1970-01-31 Renault Procédé de fabrication d'une pièce en fonte malléable et pièce en fonte malléable obtenue par ce procédé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REVUE DE METALLURGIE, Band 74, Nr. 10, Oktober 1977, Seiten 537-543, S. PARENT-SIMONIN et al.: "Influence de l'atmosphère de recuit sur la structure des fontes malléables" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2153010C1 (ru) * 1999-05-20 2000-07-20 Балтийский государственный технический университет "Военмех" им.Д.Ф.Устинова Способ термической обработки литой заготовки из ковкого чугуна при наличии в его структуре "отбела"
CN113403458A (zh) * 2021-06-23 2021-09-17 唐山鑫业科技有限公司 白心可锻铸铁生产工艺
CN113403458B (zh) * 2021-06-23 2022-03-25 唐山鑫业科技有限公司 白心可锻铸铁生产工艺

Also Published As

Publication number Publication date
PT88105A (pt) 1989-06-30
PL273903A1 (en) 1989-04-17
AT391878B (de) 1990-12-10
HUT50882A (en) 1990-03-28
ATA190187A (de) 1990-06-15
BR8803713A (pt) 1989-02-14
YU142388A (en) 1990-02-28
YU46472B (sh) 1993-10-20

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