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FR2709133A1 - Intercritical treatment process for cast iron charges. - Google Patents

Intercritical treatment process for cast iron charges.

Info

Publication number
FR2709133A1
FR2709133A1 FR9310070A FR9310070A FR2709133A1 FR 2709133 A1 FR2709133 A1 FR 2709133A1 FR 9310070 A FR9310070 A FR 9310070A FR 9310070 A FR9310070 A FR 9310070A FR 2709133 A1 FR2709133 A1 FR 2709133A1
Authority
FR
France
Prior art keywords
temperature
load
cast iron
oven
treatment process
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.)
Granted
Application number
FR9310070A
Other languages
French (fr)
Other versions
FR2709133B1 (en
Inventor
Fargues Jacques
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.)
TECH IND FONDERIE CENTRE
Original Assignee
TECH IND FONDERIE CENTRE
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 TECH IND FONDERIE CENTRE filed Critical TECH IND FONDERIE CENTRE
Priority to FR9310070A priority Critical patent/FR2709133B1/en
Priority to EP94401856A priority patent/EP0639651A1/en
Publication of FR2709133A1 publication Critical patent/FR2709133A1/en
Application granted granted Critical
Publication of FR2709133B1 publication Critical patent/FR2709133B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating

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)

Abstract

L'invention concerne un procédé de traitement intercritique à une température T d'austénisation d'une charge de fonte. Il comprend les étapes suivantes: - on chauffe dans un four, selon une courbe de température prédéterminée, ladite charge de telle manière que les courbes d'élévation de température des différentes parties de la charge soient sensiblement similaires; - on détermine préalablement une température T' <= T de telle manière que lors du maintien du four à la température T', chaque partie de la charge atteigne mais ne dépasse pas la température T; - on arrête la montée en température lorsque la température du four atteint la valeur T'; et - on maintient le four à la température T' pendant une durée prédéterminée t; - puis on refroidit la charge.The invention relates to a method of intercritical treatment at a temperature T of austenization of a cast iron charge. It comprises the following steps: - heating in an oven, according to a predetermined temperature curve, said load in such a way that the temperature rise curves of the different parts of the load are substantially similar; - A temperature T '<= T is determined beforehand in such a way that when the furnace is maintained at the temperature T', each part of the load reaches but does not exceed the temperature T; - The temperature rise is stopped when the temperature of the oven reaches the value T '; and - the oven is maintained at the temperature T 'for a predetermined time t; - then the load is cooled.

FR9310070A 1993-08-18 1993-08-18 Intercritical treatment process for cast iron charges. Expired - Fee Related FR2709133B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9310070A FR2709133B1 (en) 1993-08-18 1993-08-18 Intercritical treatment process for cast iron charges.
EP94401856A EP0639651A1 (en) 1993-08-18 1994-08-16 Intercritical heat treatment of cast iron workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9310070A FR2709133B1 (en) 1993-08-18 1993-08-18 Intercritical treatment process for cast iron charges.

Publications (2)

Publication Number Publication Date
FR2709133A1 true FR2709133A1 (en) 1995-02-24
FR2709133B1 FR2709133B1 (en) 1995-11-10

Family

ID=9450276

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9310070A Expired - Fee Related FR2709133B1 (en) 1993-08-18 1993-08-18 Intercritical treatment process for cast iron charges.

Country Status (2)

Country Link
EP (1) EP0639651A1 (en)
FR (1) FR2709133B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE624967C (en) * 1932-02-05 1936-01-31 Siemens Schuckertwerke Akt Ges Process for temperature control during bright annealing of layered glowing material under thin protective hoods
US3952945A (en) * 1973-11-16 1976-04-27 United States Borax & Chemical Corporation Furnace temperature control system
US4032368A (en) * 1972-10-05 1977-06-28 United States Steel Corporation Intercritical-cycle annealing
EP0018445A1 (en) * 1978-12-13 1980-11-12 Horst Dr. Mühlberger Process for the manufacture of castings of nodular castiron
EP0203050A1 (en) * 1985-05-22 1986-11-26 Ab Volvo A method for manufacturing austempered spheroidal graphite iron
DE3639658A1 (en) * 1986-11-20 1988-06-01 Horst Dipl Phys Dr Muehlberger Process for producing castings from a nodular graphite iron

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE624967C (en) * 1932-02-05 1936-01-31 Siemens Schuckertwerke Akt Ges Process for temperature control during bright annealing of layered glowing material under thin protective hoods
US4032368A (en) * 1972-10-05 1977-06-28 United States Steel Corporation Intercritical-cycle annealing
US3952945A (en) * 1973-11-16 1976-04-27 United States Borax & Chemical Corporation Furnace temperature control system
EP0018445A1 (en) * 1978-12-13 1980-11-12 Horst Dr. Mühlberger Process for the manufacture of castings of nodular castiron
EP0203050A1 (en) * 1985-05-22 1986-11-26 Ab Volvo A method for manufacturing austempered spheroidal graphite iron
DE3639658A1 (en) * 1986-11-20 1988-06-01 Horst Dipl Phys Dr Muehlberger Process for producing castings from a nodular graphite iron

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J.FARGUES: "Traitement de trempe étagée bainitque des fontes", FONDERIE, FONDEUR D'AUJOURD'HUI, no. 106, July 1991 (1991-07-01), PARIS FR, pages 31 - 39 *

Also Published As

Publication number Publication date
EP0639651A1 (en) 1995-02-22
FR2709133B1 (en) 1995-11-10

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Legal Events

Date Code Title Description
ST Notification of lapse