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
  • C21D9/54—Furnaces for treating strips or wire
  • C21D9/56—Continuous furnaces for strip or wire

Definitions

• the present invention relates to a discontinuous annealing furnace for metal strips
• the present invention relates to an electrothermal heat treatment furnace having low heat dissipation and a uniform temperature distribution and a low furnace height.
• the continuous annealing furnace for metal strips (hereinafter simply referred to as “strips”) consists of a preheating furnace, heating furnace, soaking furnace, 10 and cooling furnace. There. At this point, the gun-fired annealing furnace “e” for the purpose of producing strips with good surface characteristics and other quality is its heating furnace, and its soaking furnace is a radiant tube. Or heat the electric heater as a source to provide heating to the strip, including, for example, hydrogen.
• the atmosphere for improving the surface properties is mainly supplied by supplying gas and gas into the furnace.
• temperature control is easy.
• Electric heaters hereinafter referred to as electrothermal furnaces
• the electric heat treatment furnace is useful for uniform heating or soaking of the strip, but has the problem of high ripening energy cost. This problem is being addressed by the current demand for energy savings and the need to reduce steel plate manufacturing costs.
• FIG. 1 A conventional electrothermal heat treatment furnace will be described with reference to FIGS. 1 and 2.
• FIG. 1 A conventional electrothermal heat treatment furnace will be described with reference to FIGS. 1 and 2.
• Fig. 1 New side view of the conventional electric heat treatment furnace
• Fig. 2 Cross-sectional side view of the electric heat treatment furnace shown in Fig. 1
• Fig. 3 Electric heater of the conventional heat treatment furnace Diagram showing the arrangement
• FIG. 4 Strip heat reception in a conventional electrothermal heat treatment furnace.
• FIG. 5 schematically shows a turn.
• FIG. 5 is a side view of an embodiment of the present invention.
• FIG. 6 is a cross-sectional view of FIG.
• Figure 7 Diagram showing the arrangement of electric heaters in the electrothermal heat treatment furnace of the present invention
• Fig. 8 Strip heat reception in the electrothermal heat treatment furnace of the present invention. Drawing schematically showing the turn
• the conventional furnace in which this atmosphere S gas is supplied into the electrothermal heat treatment furnace through the gas supply pipe 7 is a new type of furnace, such as a heat insulation linger or a slug flapper.
• a furnace wall 8 is formed of a heat material, and the outer periphery thereof is formed with a furnace steel 9. This furnace body In order to reduce heat dissipation from the inside to the outside of the furnace, use refractory insulation with low thermal conductivity or increase the thickness of the furnace wall 8. I don't know.
• furnace height is increased to, for example, 1200 to 1500 dragons.
• a large furnace height generally leads to an increase in heat dissipation, so conventional furnaces generally have a problem of high heat dissipation.
• the conventional arrangement of the electric heater 4 on the hearth 2 is, as shown in Fig. 3, provided in a meandering manner so as to cross the longitudinal direction of the furnace.
• the middle part 4-1 of the portion of the electric heater 4 extending in the transverse direction of the furnace uniformly heats the middle part viewed in the transverse direction of the strip 6, and the strip is heated.
• Step 6 heat receiving.
• the turn is drawn schematically, it is uniform in the strip cutting direction as shown by the straight line 11 in FIG.
• the side 4-2 of the electric heater 4 located on the furnace side end side extends in the longitudinal direction of the furnace, and the side end face of the strip is located at the middle of the furnace. Because of the strong heating, the heat of strip 6 is received. As shown in the curve 12, the turn becomes higher at both ends of the strip. The strip 6 receives heat from both the middle portion 41 and the side portion 4-2 of the electric heater 4, so that the overall heat reception.
• the turn is a curve 13 of the type obtained by adding the straight line 11 and the curve 12. As can be seen from this curve 13, the end portions on both sides of the strip are heated to a higher temperature than the middle portion. In other words, the temperature distribution of the strip viewed from the furnace ⁇ cutting direction is not uniform. This can lead to strips having poor shape] or stripping quality.
• the present invention solves the above-mentioned conventional problems, and provides an electrothermal ripening furnace which has a small amount of radiation from the furnace body and a uniform temperature distribution in a new lateral direction of the furnace. It is a thing.
• the gist of the present invention is to form a furnace wall by detachably connecting a furnace side wall and a ceiling furnace wall formed of a refractory heat insulating material, and to form a furnace side wall and a ceiling furnace wall, respectively.
• An outer steel shell is provided on the outer periphery at a distance from the inner steel shell, and a low surface of aluminum, aluminum foil, stainless steel plate, etc. is provided on the opposite surface of the inner steel shell and the outer steel shell.
• a radiant material is provided to form a furnace body, and electric heating heaters are provided in a number of rows divided in a transverse direction of the furnace on a furnace floor differently provided on the furnace side wall in a furnace length direction. .
• the present invention provides a furnace wall formed by removably connecting a furnace side wall and a ceiling furnace wall, each of which is formed of a refractory heat insulating material, and forming a furnace side wall and a ceiling furnace wall, respectively.
• An outer steel skin is provided on the outer circumference at a distance from the inner steel wire, and a low surface such as aluminum, aluminum foil, stainless steel plate, etc. is provided on the opposing surface of the inner steel support and the outer steel skin.
• the furnace body is constructed by providing a radiant material, and the electric heating heaters are provided in the furnace floor provided on the furnace side wall different from the side wall of the furnace as a number of rows divided in the transverse direction of the furnace in the furnace length direction.
• the seal provided on the outer shell of the furnace side wall is fitted with a seal projection provided on an extension of the outer shell of the ceiling furnace wall. It features that the structure is formed.
• the first feature of the present invention is that the furnace side wall and the ceiling furnace wall are formed of ceramic fiber such as glass fiber or a fire-resistant heat insulating material of a fire-resistant new heat lamp. And on the outer periphery of the furnace wall With the inner steel shell provided, a double steel shell with an outer steel shell provided at an interval around the outer periphery of the inner steel shell is provided, and an aluminum shell is provided on the opposing surfaces of the inner steel shell and the outer steel shell.
• the furnace body structure is provided with low radiating materials such as mina, aluminum foil and stainless steel plate. Due to this, the heat dissipation from the inside of the furnace to the outside of the furnace is significantly reduced.
• the second point is that the furnace side wall and ceiling furnace wall, which constitute the furnace wall, have a detachable and difficult structure. This is the reason why the conventional jig is used to replace electric heaters.
• the floor is divided into multiple rows as viewed in the cross-furnace direction and arranged so as to extend in the furnace length direction. This allows the temperature distribution in the cross-furnace direction to be uniform.
• ⁇ indicates an electrothermal heat treatment furnace in general.
• Reference numeral 2 denotes a hearth on which an electric heater 14 is disposed.
• Reference numeral 10 denotes a furnace side wall, which is formed of a ceramic fiber such as a slag fiber, a slag fiber, or a fire-resistant heat insulating material of a fire-resistant heat insulation ligament. .
• an inner steel shell 14 is provided extending from the hearth 2 to the ceiling furnace wall 3, and on the outer circumference of the inner steel shell 14.
• An outer steel shell 15 is provided at an interval to form a double steel shell structure.
• the ceiling furnace wall 3 is formed of a ceramic fiber such as a slag fiber or a glass fiber, or a refractory insulated wrench.
• the outside of the ceiling furnace wall 3 is
• 15-1 is provided and has a double steel shell structure.
• the inner iron (14-1) and the outer steel shell 15 are The inner iron (14-1) and the outer steel shell 15,
• the low radiation material such as aluminum, aluminum foil, stainless steel plate, etc. is arranged on the opposite surface of (15-1 :).
• the space 16 formed by the inner steel shells 14 and (14-1) and the outer steel shells 15 and (15-1) is filled with a gas such as nitrogen or Ar or has a constant E force.
• Steel shells 14 and 15 are configured so that they can be supplied.
• Low radiation material is provided on the opposing surfaces of the double steel shell and the inner steel shells 14 and (14 .-1) and the outer steel shell 15 (15-1:). As a result, the heat dissipation from the inside of the furnace to the outside of the furnace is greatly reduced as compared with the conventional furnace.
• the furnace side wall 10 and the ceiling furnace 3 are detachable so that the ceiling furnace wall 3 can be easily removed from the side wall 10.
• the ceiling furnace wall 3 and the furnace side wall 10 are detachable, but this prevents deterioration of the airtightness inside the furnace. Therefore, the following countermeasures have been taken.
• a plurality of seal grooves 17 are provided in the outer steel shell 15 of the furnace side wall 10.
• the inner seal groove 17 has a solid sealing agent such as a fiber or a sant.
• the outer shell 17-1 is filled with water.
• the outer steel sheath 15-1 of the ceiling furnace wall 3 is extended to the side, and the projection 18-1 for the seal to be inserted into the seal grooves 17-1 and 17 at the extension thereof. , 18 are provided.
• the ceiling furnace wall 3 of the present invention is detachable as described above, the ceiling furnace wall 3 is removed when the work of replacing the heater 5 or the electric heater 4 is performed. It can be done easily. For this reason, in the present invention, the size of the diameter of the heart roller 5 and the ripening action of the positive and negative strips required for the slitting of?:? The furnace height can be determined. Therefore, the furnace height is significantly lower than that of the conventional furnace.
• the electric heater 4 of the present invention is divided into three parts in the transverse direction of the furnace (4A, 4B, 4C) and provided in a meandering manner in the furnace length direction.
• the electrothermal heat treatment furnace of the present invention has a small heat dissipation from the inside of the furnace to the outside of the furnace and has a uniform temperature distribution.9 .
• the electrothermal heat treatment furnace used for this comparison is as shown in Table 1. Then, both electrothermal heat treatment furnaces were heated to 850 ⁇ . At this time, the temperature inside the furnace side wall was both 840 shines. At this time, the temperature outside the furnace side wall was 57 5 for the present invention and 85 to 90X for the conventional furnace.
• the temperature distribution in the cross-furnace direction was investigated.
• the difference in temperature (maximum and minimum) in the cross-furnace direction was 3 for the present furnace and 7.5 kg for the conventional furnace.
• INDUSTRIAL APPLICABILITY The present invention is used particularly in the steel industry for heating and soaking furnaces of continuous annealing furnaces.

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• 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)
• Furnace Details (AREA)

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Citations (3)

• 1981
  • 1981-08-28 JP JP81503160A patent/JPS6323251B1/ja active Pending
  • 1981-08-28 WO PCT/JP1981/000200 patent/WO1983000879A1/ja unknown
• 1982
  • 1982-08-27 BE BE0/208899A patent/BE894230A/fr unknown
  • 1982-08-30 IT IT23058/82A patent/IT1203694B/it active

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