FR2311853A2 - Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones - Google Patents

Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones

Info

Publication number
FR2311853A2
FR2311853A2 FR7516102A FR7516102A FR2311853A2 FR 2311853 A2 FR2311853 A2 FR 2311853A2 FR 7516102 A FR7516102 A FR 7516102A FR 7516102 A FR7516102 A FR 7516102A FR 2311853 A2 FR2311853 A2 FR 2311853A2
Authority
FR
France
Prior art keywords
salt
zones
leave
heat treatment
metal parts
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
FR7516102A
Other languages
French (fr)
Other versions
FR2311853B2 (en
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.)
Creusot Loire SA
Original Assignee
Creusot Loire SA
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 Creusot Loire SA filed Critical Creusot Loire SA
Priority to FR7516102A priority Critical patent/FR2311853A2/en
Publication of FR2311853A2 publication Critical patent/FR2311853A2/en
Application granted granted Critical
Publication of FR2311853B2 publication Critical patent/FR2311853B2/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
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths

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 Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Device is for heat treating metal workpieces partly immersed to a specified depth in at least one bath. A sealed bell is partly immersed in the bath, and contains a device for suspension of the workpieces and air at constant pressure. The novelty is that the bell has two side envelopes between which air is trapped. The air gap is rpef. 20-30 mm wide. Used e.g. for partial heating of workpieces provided with zones which are not hardened so they remain tough. The air gap provides thermal insulation, preventing heat passing through the bell onto the zones which should not be hardened.
FR7516102A 1975-05-23 1975-05-23 Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones Granted FR2311853A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7516102A FR2311853A2 (en) 1975-05-23 1975-05-23 Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7516102A FR2311853A2 (en) 1975-05-23 1975-05-23 Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones

Publications (2)

Publication Number Publication Date
FR2311853A2 true FR2311853A2 (en) 1976-12-17
FR2311853B2 FR2311853B2 (en) 1977-12-02

Family

ID=9155592

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7516102A Granted FR2311853A2 (en) 1975-05-23 1975-05-23 Salt bath heat treatment of metal parts - which are only partially immersed in salt to leave unhardened zones

Country Status (1)

Country Link
FR (1) FR2311853A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007595A1 (en) * 1987-03-24 1988-10-06 Wyman-Gordon Company System for peripheral differential heat treatment to form dual-property workpieces
US5326409A (en) * 1987-03-24 1994-07-05 Wyman-Gordon Company System for peripheral differential heat treatemnt to form dual-property workpiece

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007595A1 (en) * 1987-03-24 1988-10-06 Wyman-Gordon Company System for peripheral differential heat treatment to form dual-property workpieces
US5326409A (en) * 1987-03-24 1994-07-05 Wyman-Gordon Company System for peripheral differential heat treatemnt to form dual-property workpiece

Also Published As

Publication number Publication date
FR2311853B2 (en) 1977-12-02

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