GB1600441A - Furnace arrangement for the heating of slabs - Google Patents

Furnace arrangement for the heating of slabs Download PDF

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Publication number
GB1600441A
GB1600441A GB5110/78A GB511078A GB1600441A GB 1600441 A GB1600441 A GB 1600441A GB 5110/78 A GB5110/78 A GB 5110/78A GB 511078 A GB511078 A GB 511078A GB 1600441 A GB1600441 A GB 1600441A
Authority
GB
United Kingdom
Prior art keywords
furnace
preliminary
pusher
assembly
pusher furnace
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.)
Expired
Application number
GB5110/78A
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of GB1600441A publication Critical patent/GB1600441A/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
    • F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3653—Preheated fuel
    • F27B2009/3661—Preheated fuel preheated with the exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1539—Metallic articles
    • F27M2001/1547—Elongated articles, e.g. beams, rails
    • F27M2001/1552—Billets, slabs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/01—Annealing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Description

(54) FURNACE ARRANGEMENT FOR THE HEATING OF SLABS (71) We, MANNESMANN AKTIEN GESELLSCHAFT, a joint stock company organised under the laws of Germany, of Mannesmannufer 2, 4 Dusseldorf 1, Germany, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a furnace assembly for the heating of slabs, comprising at least two furnaces, one furnace being of the pusher type, the slabs travelling in succession through the furnaces and being fed to a rolling mill.
Of the furnaces which can be used for heating slabs, the pusher type of furnace is the most advantageous with regard to the investment outlay and the operating costs.
However, one disadvantage of this type of furnace is that as the stack length of each slab increases there is a danger that the slabs may slide over one another and thus the overall length and the furnace throughput is limited by the thickness of the slabs. A further disadvantage is the high temperature of the furnace exhaust gas.
Further, if the furnace temperature is increased in order to increase the throughput, it is bad from a metallurgical standpoint and it also has a disadvantageous effect on the life of the furnace and on operating costs.
To avoid these disadvantages, a heating furnace has already been proposed in which a combination of a pusher type of furnace as the heating-up zone and a walking beam furnace as the equalisation zone is used, each furnace unit having its own heating arrangement (German laid-open specification 15 07 562).
Whilst such a combination is advantageous with regard throughput, it is unsatisfactory economically. In the arrangement of the above mentioned German specification a relatively expensive walking beam furnace is subjected to maximum thermal stress and maximum thermal wear. In addition the temperature of exhaust gas from the heating furnace is not lowered.
We have sought to increase the throughput of a slab pusher furnace and to improve the economic aspects of slab heating.
Accordingly the present invention provides a furnace assembly for heating slabs to be rolled in a rolling mill, which assembly comprises a pusher furnace and a preliminary furnace connected to one another by a slab transfer means, with the axis of throughflow of the preliminary furnace being situated outside that of the pusher furnace, the pusher furnace and the preliminary furnace being so arranged that in use slabs are supplied from the pusher furnace to a rolling mill and exhaust gases from the pusher furnace are supplied to the preliminary furnace.
By the arrangement of the present invention, it is possible to use a more heat-resistant and more economical pusher furnace for the heating of slabs to the required rolling temperature.
The preliminary furnace is preferably a pusher furnace or a roller hearth furnace.
Sufficient space is available for the arrange ment of the pushing device.
The temperature of the exhaust gas is also considerably reduced on leaving the preliminary furnace and the thermal efficiency of the heating process is better.
It is possible to use a pusher furnace as the preliminary furnace, so that the initial costs are reduced. If in addition the pusher furnace and the preliminary furnace chamber are arranged relative to one another with a parallel throughflow axis offset by one furnace width, the two pusher furnaces can consist of identical units, which is advantageous with regard to the reserve stocks it is necessary to keep.
The pusher furnace and the preliminary furnace may be arranged relative to one another with their throughflow axes intersecting at an angle particularly at a right angle. However, the slab may be pushed through the preliminary furnace in the direction of the length of the slab and then pushed through the pusher furnace in the direction of the slab width. However it is less advisable to arrange the throughflow axes of the two furn aces at such an angle to one another that the transfer apparatus has to partly turn the slab.
An improvement~ in thermal efficiency can be achieved if the heat of the exhaust gases is recovered and used to heat the burner air for the pusher furnace. This is achieved by passing the exhaust gases through a heat exchanger through which the burner air for the pusher furnace is also passed and is thus heated. The exhaust gases may optionally be passed through downstream exhausters after heat exchange but before entering the preliminary furnace. This again has the advantage that the furnace draught is influenced to a lesser degree by unwanted air drawn in through leakage points.
A plurality of preliminary furnaces may be provided to cooperate with a single pusher furnace. These preliminary furnaces may be arranged on two sides of the axis of throughflow of the pusher furnace; preferably they are arranged symmetrically on two sides of the axis of throughflow of the pusher furnace.
The invention is further illustrated in the accompanying Drawings wherein: Figure 1 shows a simple furnace assembly according to the present invention in plan view, Figure 2 shows a perspective view of a furnace assembly in accordance with the present invention.
The furnace assemblies shown in Figures 1 and 2 comprise pusher furnace 1 and preliminary furnace 2. Slabs 3, 4, 5 which are to be rolled are introduced in the cold state into the preliminary furnace 2 and come to abut one another by means of pusher device 23 whose line of action is indicated by arrows 6. From the preliminary furnace the slabs slide on to a roller table 24 on which for example the slab 5 is moved in the direction of arrow 8 to the front of the pusher furnace.
After the slab 5 has been aligned with the front of the pusher furnace 1, it is pressed into the pusher furnace by means of pusher apparatus 9 in the direction of arrow 29 and brought to abut the preceding slab. After complete heating-up and heating-through the slabs issue from the furnace 1 and are conveyed by means of a roller table with the direction of conveyance shown by arrow 10 to the rolling mill.
The pusher furnace 1 has a burner heating system 11. The burners 11 are supplied with fuel and hot air for the burning process through conduits 12 and 13. The heating gases flow through the pusher furnace in a direction opposite to the direction of throughflow of the slabs.
In the arrangement shown in Figure 1 the exhaust gases from the pusher furnace 1 are directed through the enclosed roller table 24 to the preliminary furnace 2, and conducted through conduit 25, heat exchanger 26 and chimney 22 and then into the free atmosphere.
The combustion air for the furnace burners 11 is subjected to preliminary heating in the heat exchanger 26.
In the arrangement shown in Figure 2 the exhaust gases from the pusher furnace 1 are removed through exhaust gas ducts 14 and 15 and conducted through heat exchangers 16 and 17. The combustion air for preheating is conducted through the heat exchanger in a separate duct system. The heat exchangers are connected into conduits 12 and 13. The exhaust gases are cooled to such an extent in the heat exchangers 16 and 17 that exhausters 18 and 19 can be arranged in exhaust gas ducts 27 and 28, these exhausters drawing the exhaust gases out of the pusher furnace 1. By way of continuations of the exhaust gas ducts 27 and 28 whose portions are designated as 20 and 21, the exhaust gases are supplied to the preliminary furnace 2 and conducted from the latter in known manner through the chimney 22 into the free atmosphere.
In both assemblies, the dimensioning of the length of the pusher furnace 1 and of the preliminary furnace 2 and the firing of the furnaces will depend on the throughput with regard to optimum heat utilisation. Thus it is unnecessary to make the length of the pusher furnace such that the sliding of the slabs over one another because of the pushing apparatus in the direction indicated by the arrows 29 is only just avoided. However, this condition remains a maximum limitation of the pusher furnace length This condition also applies to the preliminary furnace 2 if the furnace is a pusher furnace.
An assembly having only one pusher furnace does not generally achieve the required throughput which can be dealt with by the rolling mill whereas the assembly of the present invention does achieve the required throughput. Increasing the throughput of the furnace assembly is achieved in the present invention by adding a preliminary furnace. Up to certain increases in throughput the only outlay required is the investment cost of the preliminary furnace chamber. The partial heating of the slabs to several hundred degrees is either covered completely or to a great extent by using the heat of the exhaust gases.
It is possible to increase the throughput further if the preliminary furnace is provided with a comparatively small additional heating arrangement.
WHAT WE CLAIM IS:- 1. A furnace assembly for heating slabs to be rolled in a rolling mill which assembly comprises a pusher furnace and a preliminary furnace connected to one another by a slab transfer means, wish the axis of throughflow of the preliminary furnace being situated outside that of the pusher furnace, the pusher furnace and the preliminary furnace being so arranged that in use slabs are supplied from the pusher furnace to a rolling mill and ex
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. aces at such an angle to one another that the transfer apparatus has to partly turn the slab. An improvement~ in thermal efficiency can be achieved if the heat of the exhaust gases is recovered and used to heat the burner air for the pusher furnace. This is achieved by passing the exhaust gases through a heat exchanger through which the burner air for the pusher furnace is also passed and is thus heated. The exhaust gases may optionally be passed through downstream exhausters after heat exchange but before entering the preliminary furnace. This again has the advantage that the furnace draught is influenced to a lesser degree by unwanted air drawn in through leakage points. A plurality of preliminary furnaces may be provided to cooperate with a single pusher furnace. These preliminary furnaces may be arranged on two sides of the axis of throughflow of the pusher furnace; preferably they are arranged symmetrically on two sides of the axis of throughflow of the pusher furnace. The invention is further illustrated in the accompanying Drawings wherein: Figure 1 shows a simple furnace assembly according to the present invention in plan view, Figure 2 shows a perspective view of a furnace assembly in accordance with the present invention. The furnace assemblies shown in Figures 1 and 2 comprise pusher furnace 1 and preliminary furnace 2. Slabs 3, 4, 5 which are to be rolled are introduced in the cold state into the preliminary furnace 2 and come to abut one another by means of pusher device 23 whose line of action is indicated by arrows 6. From the preliminary furnace the slabs slide on to a roller table 24 on which for example the slab 5 is moved in the direction of arrow 8 to the front of the pusher furnace. After the slab 5 has been aligned with the front of the pusher furnace 1, it is pressed into the pusher furnace by means of pusher apparatus 9 in the direction of arrow 29 and brought to abut the preceding slab. After complete heating-up and heating-through the slabs issue from the furnace 1 and are conveyed by means of a roller table with the direction of conveyance shown by arrow 10 to the rolling mill. The pusher furnace 1 has a burner heating system 11. The burners 11 are supplied with fuel and hot air for the burning process through conduits 12 and 13. The heating gases flow through the pusher furnace in a direction opposite to the direction of throughflow of the slabs. In the arrangement shown in Figure 1 the exhaust gases from the pusher furnace 1 are directed through the enclosed roller table 24 to the preliminary furnace 2, and conducted through conduit 25, heat exchanger 26 and chimney 22 and then into the free atmosphere. The combustion air for the furnace burners 11 is subjected to preliminary heating in the heat exchanger 26. In the arrangement shown in Figure 2 the exhaust gases from the pusher furnace 1 are removed through exhaust gas ducts 14 and 15 and conducted through heat exchangers 16 and 17. The combustion air for preheating is conducted through the heat exchanger in a separate duct system. The heat exchangers are connected into conduits 12 and 13. The exhaust gases are cooled to such an extent in the heat exchangers 16 and 17 that exhausters 18 and 19 can be arranged in exhaust gas ducts 27 and 28, these exhausters drawing the exhaust gases out of the pusher furnace 1. By way of continuations of the exhaust gas ducts 27 and 28 whose portions are designated as 20 and 21, the exhaust gases are supplied to the preliminary furnace 2 and conducted from the latter in known manner through the chimney 22 into the free atmosphere. In both assemblies, the dimensioning of the length of the pusher furnace 1 and of the preliminary furnace 2 and the firing of the furnaces will depend on the throughput with regard to optimum heat utilisation. Thus it is unnecessary to make the length of the pusher furnace such that the sliding of the slabs over one another because of the pushing apparatus in the direction indicated by the arrows 29 is only just avoided. However, this condition remains a maximum limitation of the pusher furnace length This condition also applies to the preliminary furnace 2 if the furnace is a pusher furnace. An assembly having only one pusher furnace does not generally achieve the required throughput which can be dealt with by the rolling mill whereas the assembly of the present invention does achieve the required throughput. Increasing the throughput of the furnace assembly is achieved in the present invention by adding a preliminary furnace. Up to certain increases in throughput the only outlay required is the investment cost of the preliminary furnace chamber. The partial heating of the slabs to several hundred degrees is either covered completely or to a great extent by using the heat of the exhaust gases. It is possible to increase the throughput further if the preliminary furnace is provided with a comparatively small additional heating arrangement. WHAT WE CLAIM IS:-
1. A furnace assembly for heating slabs to be rolled in a rolling mill which assembly comprises a pusher furnace and a preliminary furnace connected to one another by a slab transfer means, wish the axis of throughflow of the preliminary furnace being situated outside that of the pusher furnace, the pusher furnace and the preliminary furnace being so arranged that in use slabs are supplied from the pusher furnace to a rolling mill and ex
haust gases from the pusher furnace are supplied to the preliminary furnace.
2. An assembly as claimed in Claim 1 wherein the preliminary furnace is a pusher furnace or a roller hearth furnace.
3. An assembly as claimed in Claim 1 or 2 wherein the pusher furnace and the preliminary furnace are arranged relative to one another with their throughflow axes parallel and offset by one furnace width.
4. An assembly as claimed in Claim 1 or 2 wherein the pusher furnace and the preliminary furnace are arranged relative to one another with their throughflow axes intersecting at an angle.
5. An assembly as claimed in Claim 4 wherein the angle at which the throughflow axes of the pusher furnace and the preliminary furnace intersect is a right angle.
6. An assembly as claimed in Claim 4 or 5, arranged so that the slabs are pushed in the direction of their lengths, through the preliminary furnace.
7. An assembly as claimed in any of Claims 1 to 6 wherein the exhaust gases of the pusher furnace are fed to the preliminary furnace through a heat exchanger to preheat the air to pusher furnace burners.
8. An assembly as claimed in Claim 7, wherein the exhaust gases of the pusher furnace after passing through the heat exchanger are passed through a downstream exhauster before entering the preliminary furnace.
9. An assembly as claimed in any of Claims 1 to 8, wherein a plurality of preliminary furnaces are provided which co-operate with a single pusher furnace.
10. An assembly as claimed in Claim 9, wherein the preliminary furnaces are arranged on two sides of the axis of throughflow of the pusher furnace.
11. An assembly as claimed in Claim 10, wherein the preliminary furnaces are arranged symmetrically on two sides of the axis of throughflow of the pusher furnace.
12. An assembly as claimed in Claim 1 substantially as herein described with reference to the accompanying Drawings.
GB5110/78A 1977-02-11 1978-02-08 Furnace arrangement for the heating of slabs Expired GB1600441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772706345 DE2706345A1 (en) 1977-02-11 1977-02-11 OVEN ARRANGEMENT FOR HEATING SLABS

Publications (1)

Publication Number Publication Date
GB1600441A true GB1600441A (en) 1981-10-14

Family

ID=6001238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5110/78A Expired GB1600441A (en) 1977-02-11 1978-02-08 Furnace arrangement for the heating of slabs

Country Status (6)

Country Link
JP (1) JPS53100113A (en)
AT (1) AT361962B (en)
DE (1) DE2706345A1 (en)
FR (1) FR2380518A1 (en)
GB (1) GB1600441A (en)
IT (1) IT1091888B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175430A2 (en) * 1984-09-17 1986-03-26 Kabushiki Kaisha Itoh Seitetsusho Apparatus for soaking steel pieces

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS552753A (en) * 1978-06-21 1980-01-10 Ito Seisakusho:Kk Method and apparatus for soaking treatment for cold billet and hot billet
JPS6039134B2 (en) * 1981-12-25 1985-09-04 株式会社伊藤製鉄所 Heat retention device for hot steel billet
DE3422922C1 (en) * 1984-06-20 1985-06-20 Korf-BSW Engineering GmbH, 7640 Kehl Plant with a heating furnace for length cut pieces of a continuous casting plant
AT381790B (en) * 1985-04-04 1986-11-25 Voest Alpine Ag PLANT FOR WARMING UP STEEL MATERIAL TO TEMPERATURE
WO2010095032A1 (en) * 2009-02-23 2010-08-26 Extrutec Gmbh Pre-heating device for objects, in particular aluminum extrusions, rods or bolts and a system having said pre-heating device
DE102009058917A1 (en) * 2009-03-02 2010-09-09 Sms Siemag Ag Method and plant for producing and / or processing a slab or a strip of metallic material

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355407A (en) * 1920-01-02 1920-10-12 American Dressler Tunnel Kilns Continuous tunnel-kiln
DE1189575B (en) * 1960-08-16 1965-03-25 Ofag Ofenbau Ges M B H Furnace arrangement for heating and reheating of sticks
DE1807562A1 (en) * 1968-11-07 1970-06-04 Didier Werke Ag Furnaces used for heating up slabs of iron
DE2031897C2 (en) * 1970-06-27 1982-01-14 Degussa Ag, 6000 Frankfurt Impact furnace for powder metallurgical sintering under protective gas
DE2256978B2 (en) * 1972-11-21 1977-12-29 Elhaus, Friedrich Wilhelm, Dipl.-Ing, 5600 Wuppertal; Prolizenz AG, Chur (Schweiz) PROCESS AND DEVICE FOR CONTINUOUS HIGH ANNEALING OF BARS, RODS, TUBES, ORD. MADE OF NON-FERROUS METAL
DE2363476C2 (en) * 1973-12-20 1975-06-26 August Thyssen-Huette Ag, 4100 Duisburg StoBofen system for heating steel slabs such as transformer steel up to a rolling temperature of around 1400 degrees C.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175430A2 (en) * 1984-09-17 1986-03-26 Kabushiki Kaisha Itoh Seitetsusho Apparatus for soaking steel pieces
EP0175430A3 (en) * 1984-09-17 1987-03-11 Itoh Iron & Steel Works Co Ltd Apparatus for soaking steel pieces

Also Published As

Publication number Publication date
IT1091888B (en) 1985-07-06
DE2706345A1 (en) 1978-08-17
IT7819272A0 (en) 1978-01-16
AT361962B (en) 1981-04-10
FR2380518A1 (en) 1978-09-08
FR2380518B1 (en) 1982-11-12
ATA4778A (en) 1980-09-15
JPS53100113A (en) 1978-09-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee