FR2360675A1 - Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet - Google Patents

Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet

Info

Publication number
FR2360675A1
FR2360675A1 FR7623531A FR7623531A FR2360675A1 FR 2360675 A1 FR2360675 A1 FR 2360675A1 FR 7623531 A FR7623531 A FR 7623531A FR 7623531 A FR7623531 A FR 7623531A FR 2360675 A1 FR2360675 A1 FR 2360675A1
Authority
FR
France
Prior art keywords
gas
mixt
natural gas
heat treatment
treatment furnaces
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
FR7623531A
Other languages
French (fr)
Other versions
FR2360675B1 (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.)
EST STE ACIERS FINS
Original Assignee
EST STE ACIERS FINS
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 EST STE ACIERS FINS filed Critical EST STE ACIERS FINS
Priority to FR7623531A priority Critical patent/FR2360675A1/en
Publication of FR2360675A1 publication Critical patent/FR2360675A1/en
Application granted granted Critical
Publication of FR2360675B1 publication Critical patent/FR2360675B1/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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

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)

Abstract

Protective gas is prepd. for use as a controlled atmos. in heat treatment furnaces. The gas is a mixt. of N2 with 3-25% natural gas, where both gases have the same dew point of ca. -40 degrees C. The two gases are mixed in a cylindrical expansion chamber, fitted at one end with a side inlet for N2, and a perforated inlet pipe extending along the axis of the chamber and supplying the natural gas. The other end of the chamber has an axial outlet for the gas mixt. Used esp. during the annealing of coils of thin cold-rolled sheet made of extra-mild steel, using, e.g. a bell-type furnace. Avoids use of coke oven gas, which has a variable compsn.; shortens total cycle time; and improves the surface as compared with when coke oven gas is used.
FR7623531A 1976-08-02 1976-08-02 Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet Granted FR2360675A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7623531A FR2360675A1 (en) 1976-08-02 1976-08-02 Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7623531A FR2360675A1 (en) 1976-08-02 1976-08-02 Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet

Publications (2)

Publication Number Publication Date
FR2360675A1 true FR2360675A1 (en) 1978-03-03
FR2360675B1 FR2360675B1 (en) 1978-12-15

Family

ID=9176444

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7623531A Granted FR2360675A1 (en) 1976-08-02 1976-08-02 Controlled atmos. for heat treatment furnaces - using mixt. of nitrogen and natural gas, suitable for annealing cold rolled steel sheet

Country Status (1)

Country Link
FR (1) FR2360675A1 (en)

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
FR2360675B1 (en) 1978-12-15

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Legal Events

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