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FR2346454A1 - Continuous heat treatment of cold rolled steel strip - by heated strip immersing in molten salt bath and annealing - Google Patents

Continuous heat treatment of cold rolled steel strip - by heated strip immersing in molten salt bath and annealing

Info

Publication number
FR2346454A1
FR2346454A1 FR7707962A FR7707962A FR2346454A1 FR 2346454 A1 FR2346454 A1 FR 2346454A1 FR 7707962 A FR7707962 A FR 7707962A FR 7707962 A FR7707962 A FR 7707962A FR 2346454 A1 FR2346454 A1 FR 2346454A1
Authority
FR
France
Prior art keywords
strip
immersing
degrees
annealing
heated
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
FR7707962A
Other languages
French (fr)
Other versions
FR2346454B1 (en
Inventor
Paul Metz
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed 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 Arbed SA filed Critical Arbed SA
Publication of FR2346454A1 publication Critical patent/FR2346454A1/en
Application granted granted Critical
Publication of FR2346454B1 publication Critical patent/FR2346454B1/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
    • 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
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

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 Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The strip is heated to a temp. above the recrystallisation temp. opt. held at this temp. and rapidly cooled by immersing in a bath of moten salts. The temp. of the bath of molten salts is pref. 250-500 degrees C. The rate of cooling in the bath is 35-500 degrees C/s. After cooling the strip is annealed or overaged by heating to 300-500 degrees C for >15s. The strip is heated to 800-1000 degrees C, pref. 850-960 degrees C, and then immersed in the bath of molten salts for >1s. to reach a temp. of 250-500 degrees C. The treatment is esp. suitable for steels for pressing and galvanising. Surface oxidn. is reduced which is particularly advantageous in galvanising.
FR7707962A 1976-04-01 1977-03-17 Continuous heat treatment of cold rolled steel strip - by heated strip immersing in molten salt bath and annealing Granted FR2346454A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU74677A LU74677A1 (en) 1976-04-01 1976-04-01

Publications (2)

Publication Number Publication Date
FR2346454A1 true FR2346454A1 (en) 1977-10-28
FR2346454B1 FR2346454B1 (en) 1980-10-10

Family

ID=19728202

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7707962A Granted FR2346454A1 (en) 1976-04-01 1977-03-17 Continuous heat treatment of cold rolled steel strip - by heated strip immersing in molten salt bath and annealing

Country Status (3)

Country Link
BE (1) BE853066A (en)
FR (1) FR2346454A1 (en)
LU (1) LU74677A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476680A1 (en) * 1980-02-21 1981-08-28 Trefilunion Heat treatment of steel for deep drawing or cold working - where continuous patenting in lead bath is used to replace spheroidising annealing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165368A (en) * 1936-02-20 1939-07-11 Cold Metal Process Co Sheet metal and method of manufacture
FR2078709A5 (en) * 1970-02-17 1971-11-05 Nippon Kokan Kk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165368A (en) * 1936-02-20 1939-07-11 Cold Metal Process Co Sheet metal and method of manufacture
FR2078709A5 (en) * 1970-02-17 1971-11-05 Nippon Kokan Kk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476680A1 (en) * 1980-02-21 1981-08-28 Trefilunion Heat treatment of steel for deep drawing or cold working - where continuous patenting in lead bath is used to replace spheroidising annealing

Also Published As

Publication number Publication date
BE853066A (en) 1977-07-18
FR2346454B1 (en) 1980-10-10
LU74677A1 (en) 1977-10-26

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Legal Events

Date Code Title Description
ST Notification of lapse