US3275309A - Apparatus for heating metal objects - Google Patents

Apparatus for heating metal objects Download PDF

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Publication number
US3275309A
US3275309A US358156A US35815664A US3275309A US 3275309 A US3275309 A US 3275309A US 358156 A US358156 A US 358156A US 35815664 A US35815664 A US 35815664A US 3275309 A US3275309 A US 3275309A
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Prior art keywords
furnace
atmosphere
pipe
charge
heating
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US358156A
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English (en)
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Wilson Lee
Paul R Barenok
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Lee Wilson Engineering Co Inc
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Lee Wilson Engineering Co Inc
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Priority to US358156A priority Critical patent/US3275309A/en
Priority to GB47126/64A priority patent/GB1065428A/en
Priority to ES0306508A priority patent/ES306508A1/es
Priority to DEL49434A priority patent/DE1260502B/de
Priority to NL6500756A priority patent/NL6500756A/xx
Priority to BE659081D priority patent/BE659081A/xx
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    • 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
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof

Definitions

  • This inner cover is made of relatively thin sheet metal, has a suitable sealing connection with the furnace base, and provides an enclosure for the coils being heated in which the desired protective or other type atmosphere may be maintained and in which such atmosphere maybe circulated to facilitate transfer of heat to and from the coils.
  • a furnace bell unit carrying suitable heating elements such as radiant combustion tubes, is placed over the inner cover and heat is applied for the desired length of time while the atmosphere within the inner cover is circulated. When heating is completed the furnace bell is removed but the inner cover must remain in place until cooling is completed to protect the charge.
  • Another objects of our invention include the provision of a highly efficient furnace structure for heating coils of strip metal which is well adapted for single frunace installations and which also may readily be paired with a second furnace structure to provide a regenerative heating .arrangement whereby the desired treatment may be effected at very low cost and in a relatively short time for a given output.
  • a further object of our invention is the provision of an improved method of and apparatus for transferring heat from a heat source to one or more coils of strip metal which achieves readily controlled, rapid and uniform heating and/ or cooling of the coil or coils.
  • FIGURE 1 is a plan view showing two of our improved furnaces arranged for regenerative heating, portions of the structure being broken away for clearness of illustration.
  • FIGURE 2 is a vertical cross-sectional view taken substantially on line 22 of FIGURE 1 on a slightly larger scale and showing the valves etc., in the'positions they assume when the charge in the right hand one of the pair of furnaces is being regeneratively preheated, and the charge in the left hand furnace is being cooled, by circulating, the total atmosphere in the two furnaces.
  • FIGURE 3 is an enlarged fragmentary cross sectional view taken substantially on line 3-3 of FIGURE 1 and illustrating the atmosphere distributing blades or vanes and the radiant heating tubes.
  • FIGURE 4 is an illustrative schematic view showing the double regenerative furnace arrangement of FIG- URES 1 and 2 with the valves, etc. in the positions they assume when the apparatus is being started up, the charge in left hand furnace being ready to be heated and the charge on the right hand frunace base being ready for preheating in the next operation.
  • FIGURE 5 is an illustrative schematic view similar to FIGURE 4 but showing the valves etc., in the positions they assume, after heating of the left hand charge is completed and during circulation of the total atmosphere between the two furnaces, the charge in the left hand furnace being cooled and the charge in the right hand furnace being regeneratively preheated by heat from the left hand furnace charge.
  • FIGURE 6 is an illustrative schematic view similar to FIGURES 4 and 5 but showing the valves etc., in the positions they assume when the atmosphere in the right hand furnace is being internally circulated over the heat source in the furnace bell to heat the charge and the charge in the left hand furnace is being cooled by circulation of the atmosphere through the furnace chamber and the external cooling means.
  • FIGURE 7 is a vertical cross sectional view of a single furnace incorporating our improved features and adapted for heating single open coils of strip metal.
  • each furnace has a base structure 1 and a sealing trough 2 extends around the periphery thereof.
  • Removable furnace bells generally indicate-d at F and F respectively, are adapted to be supported on the bases 1 of furnaces A and B and each has a depending sealing flange 3 which forms a seal in association with a suitable sealing material it; in its trough 2 when the furnaces are in position on their ases.
  • a charge support 5 is supported on the base 1 and, as illustrated, includes a top plate 6 and a bottom plate 7 spaced apart by a plurality of radial ribs 8 whereby an atmosphere passage is provided between the plates 6 and 7.
  • the top plate 6 is imperforate while the bottom plate 7 has a central opening 9 which overlies a center opening 10 in the furnace base 1.
  • vent or cooling holes 6 are shown at the centers of certain of the coils C. In some cases such holes may be desirable to permit limited flow of atmosphere over the exposed surface of plate 6 to prevent overheating thereof by direct radiation from the radiant heating tubes 12. Such holes would, of course, be placed at all locations on plate 6 where such cooling is desired.
  • the charge in furnace A comprises a group of eight tight coils C of strip metal supported on the top plate 6 of the charge support with their axes vertical and in spaced apart relation to each other.
  • the charge shown in furnace B comprises a similar group of coils C. It will be understood that the size and number of coils in any given charge may vary from one upwardly depend- 'ing on the size of the coils. Also as will be explained later, our apparatus may readily be adapted for heating "open coils of strip metal in apparatus such as is shown in FIGURE 7.
  • each of these tubes has a lower inlet leg 13, a return bend portion 14 and an upper outlet leg 15.
  • Fuel burners 16 are connected to the outer ends of the bottom legs 13 and upwardly the extending stacks 17 are adapted to carry away the products of combustion from the upper outlet legs of the combustion tubes 12.
  • Suitable gas and air supply headers or manifolds 18 and 19 are connected to the burners 1 6 to supply the desired combustible mixture thereto and when the mixture burns in the tubes they are heated throughout the length of both legs in well known manner.
  • the upper and lower legs 13 and 15 of the combustion tubes 12 are offset so that they do not lie directly one above the other and so that 'each leg has an unimpeded path for heat radiation directly downwardly to the charge in the furnace.
  • the inner ends of combustion tubes 12 are supported by a ring member 20 which is in turn carried by rods 21. These rods extend upwardly to and are supported by transverse bars 22 which extend across but do not block the furnace inlet opening 23.
  • transverse bars 22 which extend across but do not block the furnace inlet opening 23.
  • a plurality .of radially extending, circumferentially spaced inclined diffusing vanes or baflies, generally indicated at 25, extend transversely of the furnace bells and are supported at their outer ends at the side walls 11 of each of the furnace bells F and F.
  • These vanes 25 are I supported at their inner ends on a center closure plate or disc 26 which is carried by the vertical bars 21 above the inner ends of the combustion tubes 12.
  • the disc 26 serves to block the passage of atmosphere downwardly into the furnace chamber through the generally circular opening defined by the inner ends of the radial combustion tubes 12.
  • each vane taper inwardly, being widest at their outer ends, and, as seen in FIGURE 3, each vane is provided at its upper edge with an upwardly extending flange 27 and at its lower edge with a downwardly extending flange 28.
  • the main body portion 29 of each vane is inclined slightly to the horizontal and the vanes are disposed in to overlapping relation with each other so that atmosphere which enters the upper end of the furnace bells F or F through the inlet opening 23 can only exit therefrom by passing through the spaces between the edges of the vanes 25 in the general direction seen by the arrows in FIGURE 3.
  • the flow of atmosphere through the vanes may be so controlled and distributed that the desired flow over the radiant combustion tubes 12 will be obtained.
  • the vertical gap 30 betwen adjacent vanes 25 is greater at the outer edges of the vanes than at their inner edges.
  • the vertical height of space 30 is about 2" at the outer ends of vanes 25 it could advantageously be about 1" at the inner ends thereof.
  • an atmosphere outlet pipe or conduit 33 extends from the center furnace outlet opening 10 to the atmosphere circulating blower 34.
  • a vertical pipe 35 extends upwardly from the outlet of the blower 34 to the horizontal return pipe 36 which connects to the furnace bell F at the top inlet opening 23.
  • a main heat shut-off valve 37 (seen in closed position in FIGURE 2) is positioned in the vertical pipe 35 above the blower 34 and a cooler bypass pipe 38 extends from a point below valve 37 back to pipe 35 at a point above valve 37.
  • An atmosphere cooling unit, indicated at 39, is positioned in pipe 38 and is adapted to cool atmosphere flowing therethrough.
  • This cooler unit may be of any suitable type, for example, a water or air cooled heat exchanger adapted to extract heat from the atmosphere which is by-passed from the pipe 35 through pipe 38 and returned back to the pipe 35 above the valve 37.
  • a cooler shut-off valve 40 (seen in closed position in FIGURE 2) is located in the pipe 38 on the entering side of cooler 39, and, when this valve is closed, no atmosphere can flow through the cooler 39, In FIGURE 2 the pipe 38 and cooler 39 have been rotated counter clockwise from their true position seen in FIGURE 1 on to section line 2-2 of FIGURE 1 for clearness of illustration.
  • a regenerative flow connection pipe 41 leads olf from vertical pipe 35 below the valve 37 and the horizontal regenerative flow pipe 42 (FIGURE 1) is connected to pipe 41 through the vertical lift disc type valve generally indicated at V.
  • This valve V includes a housing 43 (FIG- URE 2), a seating trough 44, a valve disc member 45 having a downwardly depending flange portion 46 adapted to have sealing engagement with a suitable sealing material in trough 44 when the valve is closed, and a vertically extending valve rod 47 which projects through and is movable in the gas tight bushing 48 in housing 43.
  • a rack 49 at the upper end of rod 47 is adapted to be driven by suitable gears 50 which in turn are driven by the motor 51, thus lifting and lowering valve disc 45 be tween open and closed positions.
  • valve disc 45 is in its upper or valve open position and there can be a free flow of atmosphere from the pipe 41 through the valve housing 43 and into the horizontal regenerative flow pipe 42.
  • the motor 51 is opera-ted to lower the valve rod 47 and valve disc 45 into the closed position (seen in phantom lines in FIGURE 2) the connection between the vertical pipe 35 and the regenerative flow pipe 42 is closed and there can be no flow through pipes 41 and 42.
  • the left hand furnace A is also provided with an atmosphere outlet pipe or conduit 55 which extends to the blower 56, the outlet or which is connected to a vertical pipe 57 which in turn joins the horizontal return pipe 58 which connects to the top of the furnace bell F through its inlet opening 23.
  • a cooler by-pass pipe 61 similar to cooler by-pass pipe 38 of furnace B, extends around the main heat shutoff valve 37' (which is not seen in FIGURES 1 and 2 of the drawings but is shown in FIGURES 4-6) in vertical pipe 57 in the same manner as pipe 38 extends around the main heat shut-off valve 37 in vertical pipe 35 of furnace B.
  • An atmosphere cooler unit 62 is interposed in pipe 61 and a shut-off valve 40 (see FIGURES 4-6), similar to valve 40 in pipe 38, is provided for preventing flow through the cooler unit 62 when such is not desired.
  • a regenerative flow connecting pipe 59 extends from the vertical pipe 57 just above the outlet of the blower 56 and below the main heat shut-off valve 37.
  • This pipe 59 extends to the housing of the disc type valve V which is similar in all respects to the previously described disc valve V and which controls the flow of atmosphere between the connecting pipe 59 and the horizontal regenerative flow pipe 60.
  • pipe 60 is connected to the vertical pipe 35 above the heat shutoff valve 37 and thus the regenerative flow connections between the furnaces A and B are completed through pipe 36.
  • connections between furnaces A and B are set for the regenerative heating operation and, when both blowers 34 and 56 are operating,
  • valve 37 and its corresponding valve 37 are both closed, the valves V and V are both open, and the valve 40 in the cooler by-pass pipe 38 and its corresponding valve 40 in cooler by-pass pipe 61 are both closed, the atmosphere flow is downwardly out of furnace B through the center bottom opening 10, through pipe 33, blower 34,
  • valve V pipe 60, and back to furnace bell F of furnace B through pipe 36 and top center opening 23.
  • FIGURE 4 the furnace bell F is in position on the base 1 of the left hand furnace A and the furnace bell F of furnace B has been removed from its base 1.
  • the charge of coils supported on the coil support of furnace A is indicated at C while the charge of coils for furnace B is indicated at C.
  • the main heat shut-off valve 37 of furnace A is open, the disc valves V and V are both closed, the cooler shut-off valve 40' is also closed, and blower 56 is operating while blower 34 is idle.
  • the apparatus may be deemed to be in its starting up condition.
  • the charges C and C are both cold and the cycle of heating and cooling operations is just starting.
  • the circulation of heated atmosphere which is effected through furnace A by the blower 56 will rapidly and uniformly raise the temperature of the charge C to the desired point.
  • the valves 40 and V are closed, the flow of atmosphere caused by blower 56 is entirely through the furnace A.
  • valves, etc. are in the positions shown in FIG- URE 5 and when both blowers 34 and 56 are operated atmosphere will enter the top of furnace A through pipe 58, and will pass over the heated charge C therein and extract heat therefrom. The thus heated atmosphere will then move through pipe 55, blower 56, pipe 59, open disc valve V, pipe 60, the upper portion of pipe 35, and through the horizontal return pipe 36 into the furnace bell F.
  • the blower 34 is effective to assist in moving the atmosphere downwardly through the furnace B where it preheats the cold charge C and exits through the pipe 33. From the blower 34 the atmosphere passes through pipes 35 and 41, open disc valve V, pipes 42 and 57, and backing into the top of'furnace A through horizontal return pipe 58.
  • the annealed charge C in furnace A may be rapidly cooled to a temperature at which the furnace bell F may be removed and the charge C taken away and a new charge placed on the base 1. While this is taking place the heating of the charge C in furnace B continues until the desired treatment is effected. By the time the heating of the charge C is completed in furnace B a new charge C will have been positioned on the base 1 of furnace A and its furnace bell F will have been replaced. Now, when the valves are set in the positions of FIGURE 5 and the blowers 34 and 56 are operated regenerative heating of the new charge C in furnace A will take place with concurrent cooling of the hot charge C in furnace B.
  • the furnace bells F and F are removable from the bases on which they are supported during a cycle of operation.
  • the furnace 'bell F and the horizontal return pipe 36 which is secured to the top wall 11 thereof are removable from the base 1 as a unit.
  • Suitable lifting means,- not shown, is provided and, when the bell F is lifted vertically, the flange 3 will be lifted out of the sealing trough 2.
  • a similar seal arrangement is provided in which a trough 65 is carried by and extends around the upper end of pipe 35 and the lower end of pipe 36 is provided with a depending flange 66 which, when the bell F is positioned on the base 1, extends into trough 65 in sealing relation with a suitable sealing material 67 continued therein.
  • a similar seal is provided between the horizontal return pipe 58 of furnace bell F and vertical pipe 57.
  • FIGURE 7 is a vertical section view illustrating our invention as incorporated in a single furnace, as distinguished from the double regenerative arrangement of FIGURES 1 and 2, in which the charge support is arranged to receive an open coil of strip metal and to direct vthe flow of atmosphere through the spaces between the laps thereof.
  • a furnace bell F" is removably supported on a base structure 70.
  • the seal between the bell and the base, the arrangement of radiant heating tubes in the top portion of the furnace chamber and the means for diffusing and controlling the flow of atmosphere over the combustion tubes may be substantially the same as that previously described.
  • the base 70 is provided with a bottom outlet opening 71 from which an outlet pipe 72 leads to the inlet of a .blower 73.
  • the outlet of blower 73 is connected to a vertical pipe 74 which is connected at its upper end, through a seal generally indicated at 75, to the horizontal return pipe 76.
  • a main heat control valve 77 (shown in open position in FIGURE 7) is positioned in the pipe 74 and is adapted to regulate the flow of atmosphere therethrough.
  • the cooler by-pass pipe 78 leads off from pipe 74 below the valve 77 and returns to pipe 74 above the valve 77.
  • a cooler unit '79 Interposed in pipe 78 is a cooler unit '79 (similar to cooler units 39 and 62 previously described) and the cooler flow control and shut-off valve 80 (shown in closed position) is inserted in pipe 78 ahead of the cooler unit 79.
  • the charge illustrated in FIGURE 7 is a single open coil C" in which the laps 81 of the strip metal are separated by gaps or spaces 82 thus providing passageways through which atmosphere may pass.
  • the coil C is supported on a coil support and plenum unit generally indicated at P which includes a circular outer wall 83 and plurality of vertical radially extending coil supporting webs or flanges 84 extending inwardly therefrom.
  • a center closure plate 85 slightly larger than the center opening in the coil C" is supported at the inner ends of the webs 84 and the outer periphery of coil C" rests upon an outer ring member 86 which is mounted at the upper edge of wall 83.
  • An inclined or dished circular baffle plate 87 extends downwardly and inwardly from the top of ring 83 to the central opening in unit P which is defined by the inner ends of radial webs 84 and overlies, and is substantially the same size as, the bottom opening 71 in base 70.
  • the heat control valve 77 is closed and the cooler control valve 80 is opened and circulation of the atmosphere is continued until the temperature of the coil C is reduced to the desired value, it being understood that the time required for this to take place is greatly reduced by the cooling of the circulating atmosphere which is effected by the cooler unit 79.
  • our invention may also be incorporated in a single furnace designed for heating tight coils of strip metal.
  • the coil support would be similar to that shown in the furnaces of FIGURES 1 and 2 while the rest of the structure would be substantially identical with that of FIGURE 7.
  • the desired regulation may be accomplished, referring to FIGURE 7 for purposes of illustration, by gradually closing the main heat control valve 77 and simultaneously gradually opening of the cooler control valve 80 in such a manner that at first the circulating atmosphere is only slightly cooled.
  • the changeover from the circulation of heated atmosphere to the circulation of cooling atmosphere may be effected in a minimum time and without danger of
  • This actuation of the valves 77 and 80 may be effected manually or by properly cou trolled power means which, for example, operates in response to the pressure differential between the inside and the outside of the furance bell F" and does not permit this differential to exceed a predetermined safe value.
  • the above type of control of the operation of the flow regulating valves may also be utilized in the regenerative apparatus of FIGURES 1 and 2 when the preheating cycle illustrated in FIGURE 5 is initiated.
  • the closing into their fully closed positions is preferably effected gradually so that the temperature of the atmosphere from bell F which enters bell F through return pipe 58 will not be so cool as to cause a dangerous pressure differential to occur between the inside and outside of hell F and, in like manner, so that the heated atmosphere from hell F that is conveyed to hell F for preheating purposes will not be so hot initially as to cause rapid expansion of the atmosphere in the bell P which might force atmosphere out through the seals thereof.
  • the atmosphere diffuser in the upper part of the furnace bells which, as illustrated, is made up of a plurality of radial vanes 25 (see bell F in FIGURE 2) serves to diffuse and distribute the atmosphere which enters the plenum or space in the top of the bell above the combustion tubes 12 through the inlet opening 23.
  • This diffusion and distribution is important in that it permits the flow of atmosphere over the radial combustion tubes 1-2 to be so controlled that the tubes are uniformly cooled, thus preventing undesirable relatively hot and cool areas thereof.
  • the arrangement of our apparatus wherein the source of radiant heat (the tubes 12) is directly above the exposed upper ends of the coils to be heated, enables heat to be transferred to the end-s of the coils rapidly and efficiently by direct radiation.
  • heat applied to the ends of a coil is much more effective in raising the temperature of the entire mass of the coil than heat applied to the outside or inside cylindrical surfaces of the coil. This is because heat applied to the ends travels rapidly inwardly into the coil by conduction whereas the spaces and relatively poor contact between adjacent laps of a coil are a serious bar to the travel of heat radially from the inner or outer cylindrical surfaces of the coil.
  • heating means By the described arrangement of heating means, coil support means, and atmosphere flow control means a rapid and highly eflicient heating of a charge (as illustrated a coil or coils of strip metal) in a furnace chamber may be obtained.
  • a charge as illustrated a coil or coils of strip metal
  • the atmosphere flow control means of our apparatus provides effective protection for combusion tubes or other source of radiant heat and, by combining our efiicient heating with regenerative and/or direct atmosphere cooling it is possible to eliminate the use of inner covers with their accompanying expense, handling problems, etc.
  • Apparatus for heating metal objects including a base, a charge support on said base, a furnace bell on said base forming an enclosed furnace chamber therewith, said furnace bell having a top opening, said base having a bottom 10 opening and said charge support being adapted to support a charge in said furnace chamber, atmosphere circulating means connecting said bottom opening in said base and said top opening in said furnace bell, heating means supported in said furnace bell and extending transversely thereof, said heating means having a radiant heating surface area disposed for direct radiant heating of a charge on said charge support, and atmosphere diffusion means comprising a plurality of inwardly extending inclined vanes having their adjacent longitudinal edges spaced apart and .being supported by said furnace bell above said heating means on the side thereof opposite said radiant heating surface area.
  • the heating means comprises a plurality of inwardly extending, spaced apart combustion tubes supported by said furnace bell above said charge support.
  • Apparatus for heating metal objects including a base, a charge support on said base, a furnace bell on said base forming a furnace chamber therewith and including a side wall and a top wall having a top atmosphere inlet opening, said base having a bottom atmosphere outlet opening and said charge support being adapted to support a charge above said base and to form a passage through which the atmosphere in said furnace chamber may pass from said furnace chamber to said bottom opening in said base, atmosphere circulating conduit means connecting said bottom opening in said base and said top opening in said furnace bell, blower means for circulating the furnace chamber atmosphere through said conduit and said furnace chamber, heating means in the upper portion of said furnace bell comprising a plurality of combustion tubes supported in said side wall of said furnace and extending transversely thereof and having inlet and outlet ends outside of said bell, said combustion tubes having their lower surfaces exposed for direct radiant heating of a charge on said charge support and having their upper surfaces disposed below said top wall of said furnace bell whereby an atmosphere plenum chamber is formed between said combustion tubes and said furnace bell top wall, and atmosphere diffusion means in
  • Atmosphere for heating metal objects as defined in claim -4 in which said atmosphere passages between said adjacent longitudinal edges of said inclined vanes vary in width from the outer to the inner ends of said vanes.
  • said charge support includes a charge supporting plate portion supported above said base and having its outer periphery spaced inwardly from said side wall of said furnace bell, said plate portion being disposed to direct the atmosphere circulated by said blower means inwardly to said bottom outlet opening below said plate portion and being provided with one or more vent holes positioned to permit limited flow of atmosphere therethrough for cooling an adjacent area of said plate portion which is not covered by the furnace charge and is therefore exposed to direct radiant heating from said heating means.
  • Apparatus for heating metal objects as defined in claim 4 including an atmosphere cooler by-pass pipe extending from said atmosphere circulating conduit at one point and rejoining said conduit at another point closer to said top opening than said one point, atmosphere cooling means on said cooler by-pass pipe, valve means in said atmosphere circulating conduit between said two points of connection of said cooling by-pass pipe thereto for controlling the flow of atmosphere through said conduit, valve means in said atmosphere cooling by-pass pipe for controlling the flow of said atmosphere therethrough, and means for operating said valve means whereby when said valve in said atmosphere circulating conduit is closed said valve in said atmosphere cooling by-pass pipe is opened and vice versa.
  • Apparatus for heating metal objects including two adjacently disposed furnace bases, two furnace bells adapted to be removably supported on said furnace bases to form enclosed furnace chambers therewith, each of said furnace bells having a top center opening, each of said furnace bases having a bottom center opening, atmosphere circulating conduits adapted to connect each of said bottom center openings in said furnace bases with the said top center opening in the furnace bell supported thereon, heating means supported in each of said furnace bells, atmosphere cooling by-pass pipes extending from one point on each of said atmosphere circulating conduits to a point thereon closer to the furnace bell top center opening with which the conduit is connected, a main heat shut-off valve ineach of said atmosphere circulating conduits between said points of connection of said atmosphere cooling by-pass pipes therewith, atmosphere cooling means in each of said atmosphere cooling by-pass pipes, a cooler flow shut-off valve in each of said atmosphere cooling by-pass pipes, regenerative flow connecting pipes extending from each of said atmosphere circulating conduits on one side of the said main heat shut-off valve therein to the

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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)
US358156A 1964-04-08 1964-04-08 Apparatus for heating metal objects Expired - Lifetime US3275309A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US358156A US3275309A (en) 1964-04-08 1964-04-08 Apparatus for heating metal objects
GB47126/64A GB1065428A (en) 1964-04-08 1964-11-19 Apparatus and process for heat treating metals
ES0306508A ES306508A1 (es) 1964-04-08 1964-11-27 Metodo y aparato para el tratamiento termico de metales.
DEL49434A DE1260502B (de) 1964-04-08 1964-12-02 Ofen zur Waermebehandlung von Metallbandspulen
NL6500756A NL6500756A (pl) 1964-04-08 1965-01-21
BE659081D BE659081A (pl) 1964-04-08 1965-01-29

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US358156A US3275309A (en) 1964-04-08 1964-04-08 Apparatus for heating metal objects

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US3275309A true US3275309A (en) 1966-09-27

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BE (1) BE659081A (pl)
DE (1) DE1260502B (pl)
ES (1) ES306508A1 (pl)
GB (1) GB1065428A (pl)
NL (1) NL6500756A (pl)

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US3536343A (en) * 1969-02-14 1970-10-27 R L Clark Corp The Scrap preheat hood
US4544142A (en) * 1984-03-16 1985-10-01 Kawasaki Steel Corporation Rotary hearth finish annealing furnace
CN114887578A (zh) * 2022-06-07 2022-08-12 江苏清淼环保有限公司 一种物料反应充分的立式再生炉及反应方法

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DE1758524B1 (de) * 1968-06-20 1972-01-13 Ishikawajima Harima Heavy Ind Ofen zum gluehen von ringfoermigem gut
DE2624828C2 (de) * 1976-06-03 1985-08-14 Alco Standard Corp., Valley Forge Verfahren und Ofen zur Durchführung einer Wärmebehandlung von Werkstücken
GB2167170B (en) * 1984-11-21 1988-05-18 Salem Furnace Heat treatment of coils of metal

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Also Published As

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DE1260502B (de) 1968-02-08
ES306508A1 (es) 1965-04-01
GB1065428A (en) 1967-04-12
NL6500756A (pl) 1965-10-11
BE659081A (pl) 1965-07-29

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