FR2441664A1 - High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength - Google Patents

High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength

Info

Publication number
FR2441664A1
FR2441664A1 FR7832144A FR7832144A FR2441664A1 FR 2441664 A1 FR2441664 A1 FR 2441664A1 FR 7832144 A FR7832144 A FR 7832144A FR 7832144 A FR7832144 A FR 7832144A FR 2441664 A1 FR2441664 A1 FR 2441664A1
Authority
FR
France
Prior art keywords
steel
induction heating
grain size
fatigue strength
subjected
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
FR7832144A
Other languages
French (fr)
Other versions
FR2441664B1 (en
Inventor
T Hijikata
T Yamazaki
K Fujita
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.)
Neturen Co Ltd
Original Assignee
Neturen Co Ltd
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 Neturen Co Ltd filed Critical Neturen Co Ltd
Priority to FR7832144A priority Critical patent/FR2441664A1/en
Publication of FR2441664A1 publication Critical patent/FR2441664A1/en
Application granted granted Critical
Publication of FR2441664B1 publication Critical patent/FR2441664B1/fr
Granted 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
    • 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
    • C21D1/42—Induction heating
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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

The fine grain size of steel decreases progressively from its core to its surface, this structure being obtd. by brief repeated high frequency induction heating of the surface of the steel so through heating is gradually achieved. The steel is then quenched, followed by tempering using high frequency induction heating; and the steel pref. contains >0.3% carbon. Each brief heating cycle pref. raises the surface of the steel to above the Ac3 transformation point and is followed by a pause in which the surface drops below the Ar1 transformation point and the cycle is repeated at least twice so the steel is heated right through, or nearly right through, to the centre of the core. The treatment increases the strength, toughness, and fatigue strength of the steel, so it is suitable for coil springs, torsion bars etc.
FR7832144A 1978-11-14 1978-11-14 High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength Granted FR2441664A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7832144A FR2441664A1 (en) 1978-11-14 1978-11-14 High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7832144A FR2441664A1 (en) 1978-11-14 1978-11-14 High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength

Publications (2)

Publication Number Publication Date
FR2441664A1 true FR2441664A1 (en) 1980-06-13
FR2441664B1 FR2441664B1 (en) 1981-08-14

Family

ID=9214863

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832144A Granted FR2441664A1 (en) 1978-11-14 1978-11-14 High tensile spring steel - is subjected to repeated surface induction heating to obtain extremely small grain size and increase fatigue strength

Country Status (1)

Country Link
FR (1) FR2441664A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167460A (en) * 1961-08-18 1965-01-26 Deutsche Edelstahlwerke Ag Method of surface-hardening steel workpieces in the form of bodies of revolution
USRE27505E (en) * 1971-01-14 1972-10-10 Method for producing ultrafine grained steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167460A (en) * 1961-08-18 1965-01-26 Deutsche Edelstahlwerke Ag Method of surface-hardening steel workpieces in the form of bodies of revolution
USRE27505E (en) * 1971-01-14 1972-10-10 Method for producing ultrafine grained steel

Also Published As

Publication number Publication date
FR2441664B1 (en) 1981-08-14

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