GB2054661A - Cooling Steel Strip in Continuous Annealing - Google Patents
Cooling Steel Strip in Continuous Annealing Download PDFInfo
- Publication number
- GB2054661A GB2054661A GB8021345A GB8021345A GB2054661A GB 2054661 A GB2054661 A GB 2054661A GB 8021345 A GB8021345 A GB 8021345A GB 8021345 A GB8021345 A GB 8021345A GB 2054661 A GB2054661 A GB 2054661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cooling
- steel strip
- rollers
- cooling rollers
- water
- 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
Links
- 238000000137 annealing Methods 0.000 title claims description 15
- 238000001816 cooling Methods 0.000 claims abstract description 152
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims description 18
- 239000002826 coolant Substances 0.000 claims description 8
- 238000001953 recrystallisation Methods 0.000 claims description 8
- 239000013589 supplement Substances 0.000 claims 1
- 239000000498 cooling water Substances 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 14
- 238000005406 washing Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000112 cooling gas Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- 238000005554 pickling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- C21D9/573—Continuous furnaces for strip or wire with cooling
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
Steel strip S heated to a temperature above the recrystallation temperature is passed through a cooling unit including a plurality of cooling rollers 32, 32a internally cooled by cooling water. The strip S passes alternately over upper and lower surfaces of the cooling rollers 32, 32a. By raising and lowering alternate cooling rollers 32, the contact area and, therefore, the contact time between the strip and the cooling rollers are varied to adjust the cooling rate. It is also possible to separate the cooling rollers 32, 32a from the strip and directly cool it with water. The strip may be pre-cooled with gas. <IMAGE>
Description
SPECIFICATION
Cooling Steel Strip in Continuous Annealing
Methods of cooling steel strip (this term includes plate) in connection with continuous annealing are generally classified into two types: gas jet cooling and water cooling. Each type has its own advantages and defects.
More particularly, according to the gas jet system, cooling gas is blasted at a high speed against steel strip heated to a temperature of about A transition point to cool the strip to about 4000C and then the strip is subjected to a superaging treatment for 3 to 5 minutes. The cooling efficiency of gas is inferior than that of liquid because of its small thermal capacity. Although liquid has a larger thermal capacity than gas, the vapour film formed on the surface of the strip decreases the cooling efficiency. For this reason, in a modern high speed large processing line, the cooling equipment is large and expensive and has a high running cost.
However, the gas jet system has an advantage in that its cooling speed can be adjusted at will, which is suitable for soft steel strip, and the heat cycle is economical because (in contrast with the water cooling) it is not necessary to once cool the coolant to room temperature and then heat it of a super-aging temperature.
Among the water cooling types there are water quenching systems in which a liquid coolant is ejected upon a uniformly heated steel strip or in which a heated steel strip is dipped in a liquid coolant. To eject liquid, not only special ejection equipment is necessary but also the pattern of the ejected cooling liquid varies, thus failing to obtain uniform cooling and homogeneous product.
The heat cycle of each cooling system is fast.
Particularly with the dip method, since the cooling speed is especially high, of the order of 100020000C/s, which should be compared with 10 300 cos for the gas jet method. The dip method is suitable for manufacturing high tensile steel having a mixed structure of ferrite and martensite and not containing any special elements. Since this method ensures high speed cooling, the cooling, the cooling equipment for a high speed steel strip processing line is extremely compact.
Moreover, as it is sufficient to merely pass the steel strip through cooling water the running cost can be greatly reduced.
In spite of the advantages described above, since the cooling speed is too rapid, even when the cooling water is heated to boiling point, it is impossible to transfer to the super-aging temperature during cooling; and, since the steel strip subjected to cooling comes to about 1 000C or ambient temperature, where super-aging treatment is performed subsequent to quenching it is necessary to reheat the steel strip which has been cooled to such a low temperature, which requires additional process steps and equipment, resulting in poor thermal efficiency.
What is desired is a method and apparatus for cooling a continuously running steel strip capable of readily adjusting the cooling rate of a steel strip. It would also be desirable to be able to cool at any cooling rate a steel strip which has been heated to recrystallation temperature, without forming oxide films.
The present invention provides a method of cooling a steel strip which has been heated to a temperature above recrystallization temperature in a continuous annealing treatment, comprising the steps of passing the steel strip about a plurality of cooling rollers and varying the contact time of steel strip with the cooling rollers so as to vary cooling rate.
According to another aspect of this invention there is provided a method of cooling steel strip which has been heated to a recrystallization temperature in a continuous annealing treatment, characterized by the steps of cooling the steel strip with cooling gas and then cooling the steel strip with water.
The invention also provides apparatus for cooling a steel strip which has been heated to a temperature above recrystallization temperature, comprising a cooling unit including a plurality of cooling rollers about which the steel strip is passed, and a mechanism for varying the contact area between the steel strip and the cooling rollers, thus varying contact tirne between the steel strip and the cooling rollers, the interior of the cooling rollers preferably being passed with cooling medium.
A gas cooling unit which ejects cooling gas against the steel strip may be provided upstream of the water cooling unit. The steel strip is preferably passed about alternate upper and lower surfaces of the cooling rollers. When alternate cooling rollers are raised to away from the strip, the cooling unit may be filled with water thus effecting direct cooling of the steel strip. In a preferred embodiment, a water tank is connected to the cooling unit via a water seal and the cooling water is circulated through the cooling unit and the water tank. In this manner when water is drained from the cooling unit and the water tank, the alternate rollers are lowered to cause the steel strip to pass through a wavy passage while contacting the upper and lower surfaces of the cooling rollers.In this case, cooling water is passed through the interior of the cooling rollers, thus effecting indirect cooling. In this manner, the cooling unit of the preferred embodiment can be readily switched between direct cooling and indirect cooling.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic representation of a continuous annealing installation;
Figure 2 is a side view of the cooling rollers shown in Figure 1;
Figure 3 is a plan view of the cooling rollers shown in Figure 2;
Figure 4 is a diagrammatic representation of another continuous annealing installation;
Figure 5 is an enlarged side view of the cooling unit shown in Figure 4 when it is used as a direct water cooling unit;
Figure 6 is a side view similar to Figure 5 showing a manner of cooling the cooling rollers by water passing therethrough;
Figure 7 is a diagrammatic longitudinal sectional view showing one example of the cooling unit together with a gas cooling unit; and
Figure 8 is a partial view showing a modification of the installation shown in Figure 4.
In the continuous annealing installation shown in Figure 1, steel strip S payed out from a selected one a b ontinuously one of a plurality of uncoilers 1 a is iS passed through a processing line by alternately connecting together the strips payed out from successive uncoilers, by means of a shear 2a and a welder 2b. Following the welder 2b, in succession, are an alkali washing tank 3, an electrolysis rinsing tank 4, and a hot water spray washing tank 5, which together constitute a pretreatment surFace cleaning unit. After passing through this unit, the strip is guided into a furnace 10 via a dryer 6 and an inlet looper 7. The furnace 10 includes a heating zone 8 for raising the strip to a recrystallization annealing temperature, a uniform heating zone 9, and a cooling unit 12.
The strip heated recrystalli2ed, annealed, and cooled in this manner is then introduced into the furnace 10 again and passed through a reheating zone 13 for raising the strip to an over-aging temperature, an over-aging zone 14, and a gas cooling zone 1 5. The strip is then passed through an outlet looper 16, a water cooling unit 1 7, a dryer 1 8, and a refining (skin pass or temper rolling) mill 19. After passing through the mill 19, the strip S passes successively through a trimming width varying notcher 20, a side trimmer 21, an oiler 22, and exit shear 23, and is finally taken up by a take-up reel 24.
The cooling unit utilized in tha annealing installation is shown in Figures 2 and 3. More particularly, the strip S passes over four rollers 32 and 32a. A pair of rollers 32 can be raised or lowered together with their supporter 31 by means of a screw or oil-pressure jack 30. Water or another coolant passes through the interior of the rollers 32 and/or 32a. By varying the contact angle or length of the strip in contact with the
upper surfaces of the rollers 32 and the lower surfaces of the rollers 32a the contact time can be varied even under the same running speed, thus varying the cooling speed and the temperature of the cooled strip, so as to send the strip to the next step while maintaining it at a definite temperature.This cooling unit can be used at any
point of travel of the strip, for example, in gas cooling zone 15 and in the water cooling unit 1 7.
The cooling unit shown in Figures 2 and 3 can also be used in a cooling apparatus which can be switched to direct cooling depending upon the characteristics of the steel strip to be cooled.
Steel strips not requiring over-aging treatment can be cooled at such high cooling speeds as 1 000-20000C/s if oxide films are properly
removed. Especially, in a high tensile steel plate or strip in which a mixed structure of ferrite and martensite is obtainable with only a small quantity of special elements, such high speed cooling by direct contact is advantageous.
Accordingly, the cooling unit can be also constructed to be switchable between indirect cooling using cooled rollers and direct cooling using water.
Figure 4 shows a modified continuous annealing apparatus including a switchable type of cooling unit, which is also shown in Figures 5 and 6. More particularly, the strip S is passed between four roller 32 and 32a, of which the upper rollers 32a are movable in the vertical direction by a screw or oil-pressure cylinder mechanism (not shown). Thus, when the upper rollers 32a are raised as shown in Figure 5, the strip S passes directly between the guide rollers 1 2a and 1 2b without contacting the cooling rollers 32 and 32a; whereas, when the upper rollers 32a are lowered as shown in Figure 6, the strip S passes alternately over the rollers 32 and 32a. The contact area of the strip against the rollers can be adjusted depending upon the degree of lowering of the upper rollers 32a.
Accordingly, in the state shown in Figure 6, the cooling speed and the final cooling temperature can be adjusted as desired by raising and lowering the upper rollers 32a.
Where the switchable cooling unit 12 shown in
Figure 4 is used for direct water cooling in the manner shown in Figure 5, it is necessary to remove oxide film deposited on the strip during the water cooling. For this purpose, a means for removing oxide film is provided between the cooling unit 12 and the reheating zone 13 as shown in Figure 4. Thus, the strip cooled in the cooling unit 12 is passed through a pickling tank 25, a warm water washing tank 26, a neutralizing tank 27, and a dryer 28. Alternatively, as shown in Figure 8, the oxide film removing means may be installed between the outlet looper 1 6 and the mill 19, the said means comprising a pickling tank 48, a warm water washing tank 49, a neutralizing tank 50, another warm water washing tank 51, a water washing tank 52, and a dryer 53.On the other hand, where the cooling unit is used as indirect cooling using rollers as shown in Figure 6, oxide film is not formed, so that it is not necessary to use the pickling tank, the warm water washing tank and the neutralizing tank. Even in this case, the water washing tank 52 and the dryer 53 may be used.
As shown in Figure 7 a gas jet cooling unit 11 may be added to the cooling unit 12 described above. The gas jet cooling unit 11 comprises a motor driven blower 60 and a plurality of gas ejection nozzles 41 which eject cooling gas sent from the blower 60 against the strip. The cooling gas circulates in the unit 11 and is cooled by water tubes 1 a in front of the blower 60 down to a temperature of 50 to 1 500C from a temperature of 1 50 to 2500C. As described above, the operating state of the cooling unit 1 2 is switchable between those shown in Figures 5 and 6. On the right hand side of a cooling chamber 35 is provided a circulating tank 36 supplemented with fresh water from a water supply pipe 46 when desired.On both sides of the water circulating tank 36 there are water level adjusting gates 37 and 37a to adjust the water levels in the cooling chamber 35 and the tank 36. A strip exit port 34 is formed on the left hand side of the cooling chamber 35 to guide the strip to the pickling tank 25 or directly to the reheating zone 13. The water in the tank 36 is conveyed to water nozzles 43 via a conduit 38 including a filter 33 and a pump 42 to eject cooling water against the opposite surfaces of the strip S.
A warm water reservoir 39 is located beneath the tank 36 for receiving warm water to the left of the gate 37 and water flowing from the gate 37a.
The warm water collected in the reservoir 39 is discharged through a pump 40. The reservoir 39 is connected to the tank 36 through a pipe 45 and a valve 47.
In operation, the water level in the cooling chamber 35 is adjusted by the gate 37 while the strip is precooled by the gas blasted thereon through a plurality of nozzles 41 (for example 10 or more) and then cooled by the water in the cooling chamber 35. The water therein also acts as a sealing means for the succeeding processing line. The warm water discharged by the pump 40 may be used in the hot water washing tank. When the valve 47 is opened the water in the cooling chamber 35 to the left of the gate 37 is completely discharged into the reservoir 39 and the strip is cooled in the state shown in Figure 6 by the cooling rollers 32 and 32a. At this time, cooling water is passed through the interior of these rollers.
Accordingly, the switching of the cooling states between Figures 5 and 6 can be readily accomplished without discharging entire water of a large tank 36 but by merely discharging a relatively small quantity of the cooling water to the left of the gate 37. Even when the water to the left of the gate 37 is discharged, the cooling gas in the jet cooling unit 11 is prevented from discharging to the outside by a water seal 44 disposed between the cooling chamber 35 and the tank 36.
As a consequence, with the construction shown in Figures 4 to 7 it is possible to cool the strip very quickly with water to a low temperature near room temperature or relatively slowly with water cooled rollers which do not form oxide films on the strip at the time of cooling, thus smoothly effecting a series of processings including overaging processing so as to produce various types of steel of steel strips or plates suitable for different applications.
The indirect cooling will now be described in more detail. The temperature of the steel strip supplied to the cooling unit 12 through the heating zone 8 for the recrystallization annealing and the uniform heating zone 9 varied slightly, generally in the range 500 to 80006, depending upon the thickness and the composition, and the strip is cooled by cooling rollers 32 and 32. The cooling water flowing through these cooling rollers may be at room temperature, and variation in the temperature of the cooling water ranging from 50C to 300C does not cause any appreciable change in the cooling effect. Accordingly, even when the strip is cooled by 1 OC or heated by 60-700C, such cooling and heating do not affect the cooling effect of the cooling rollers.
When the cooling rollers through which cooling water is passed are in contact with the steel strip, and when steel strip having a thickness of 0.6 mm and heated to 300600 C, for example, is contacted with the cooling rollers for about one second, the strip may be cooled by about 1 800C, whereas when in contact with the rollers for two seconds, the strip may be cooled by about 2600C.
When a steel strip having a thickness of 1.2 mm is in contact for one second, it may be cooled by about 900C whereas it may be cooled by about I 400C when contacted for 2 seconds.
Where steel strip having a thickness of 0.8 mm running at a speed of 160 m/min is in contact with internally water-cooled rollers 32 and 32a at a contact angle of 0.87r radians after being heated to 5800C by recrystallization annealing treatment, it may be cooled to 505-51 50C by the first roller and to 465-4800C by the second roller. The strip may be cooled to 41 0-4200C by the third roller and then to 3800C by the fourth roller. The same result can be attained by reducing the contact angle as the roller diameter is reduced. Even when the strip gauge or line speed varies, a similar result can be obtained with a contact time of less than ? seconds by varying other parameters.The strip thus cooled to 3503800C is guided into the following heat treatment zone (13-15). Accordingly, fuel cost necessary for reheating the strip can be reduced 2530% in comparison with that in a case wherein strip is cooled to about room temperature.
Example
Low carbon steel strip having a thickness of 0.8 mm and a width of 1000 mm was passed through the heating zone 8 and The uniform heating zone 9 at a speed of 1 50 m/min to effect recrystallization annealing for 1 min at a temperature of 7000C and was then supplied to the cooling unit 12 shown in Figure 1. Each one of the cooling rollers 32 and 32a has a diameter of 600 mm and cooling water at 1 50C was passed through these rollers at a rate of 2501/min; the strip S was cooled by passing it over these cooling rollers at a contact angle of from zero to 0.97s radians. The temperature of the strip S was about 6000C when it entered the cooling unit and it was cooled to a temperature in the range from about 3950C to about 41 SOC; the variation in the temperature of the cooled strip was less than 200C, which is effectively uniform cooling. The thus cooled strip was than over-aged at a temperaturn of 400-3500C for 3 min in the reheating zone 13 and the over-aging zone 14, thereby obtaining steel strip having uniform mechanical properties which is suitable for use in contraction.
Claims (19)
1. A method of treating steel strip which has
been heated to a temperature above the
recrystallization temperature in a continuous
annealing treatment, the method comprising the steps of passing the steel strip over a plurality of cooling rollers and adjusting the contact time of the steel strip with the cooling rollers in order to adjust the cooling rate.
2. A method according to claim 1, wherein an over-aging treatment is applied to the steel strip after the steel strip has been cooled by the cooling rollers.
3. A method as claimed in claim 1 or 2, in which the contact time is adjusted by adjusting the contact angles between the steel strip and the cooling rollers.
4. A method as claimed in any of Claims 1 to 3, wherein coolant is passed through the interior of the cooling rollers.
5. A method as claimed in any of claims 1 to 4, wherein the steel strip passes alternately over upper and lower surfaces of the cooling rollers.
6. A method as claimed in any of claims 1 to 5, further comprising the step of cooling the steel strip with gas before the steel strip is cooled by the cooling rollers.
7. Apparatus for carrying out a method according to claim 1, comprising a cooling unit including a plurality of cooling rollers over which the steel strip is to be passed, and means for adjusting the contact area between the steel strip and the cooling rollers in order to adjust the contact time between the steel strip and the cooling rollers.
8. Apparatus as claimed in claim 7, including means for passing a coolant through the interior of the cooling rollers.
9. Apparatus as claimed in claim 7 or 8, wherein the means for adjusting the contact area between the steel strip and the cooling rollers causes the strip to pass alternately over upper and lower surfaces of the cooling rollers.
10. Apparatus as claimed in claim 7 or 8, including means for raising and lowering alternate cooling rollers with respect to remaining cooling rollers so that when the said alternate rollers are raised the steel strip passes without contacting the cooling rollers, whereas when the said alternate cooling rollers are lowered the steel strip passes alternately over upper and lower surfaces of the cooling rollers.
1 Apparatus as claimed in claim 10, wherein the cooling rollers are arranged in a cooling unit and means are provided for supplying the unit with a coolant when the said alternate cooling rollers are raised.
12. Apparatus as claimed in claim 11, including a water tank connected to the cooling unit through a water seal, a reservoir connected to the water tank, and a pump for supplying water from the tank to the cooling unit.
13. Apparatus as claimed in claim 12, including water nozzles disposed in the cooling unit to face opposite sides of the steel strip, the water nozzles being connected to an outlet side of the pump.
14. Apparatus as claimed in claim 12 or 13, including a gate at an intermediate point of the water tank, the reservoir being connected to the water tank, at a point between the gate and the water seal, through a valve.
1 5. Apparatus as claimed in claim 1 4, wherein a water supplement pipe is connected to the water tank on the side of the gate remote from the water seal.
16. Apparatus as claimed in any of claims 7 to 15, further comprising means for cooling the steel strip with gas before it reaches the cooling rollers.
1 7. Apparatus as claimed in claim 16, wherein the gas cooling means comprises a plurality of nozzles for ejecting cooled gas against the steel strip, a blower for propelling the gas through the nozzles, and a heat exchanger for cooling the circulating gas.
1 8. A method as claimed in claim 1, substantially as described herein with reference to the accompanying drawings.
19. Apparatus as claimed in claim 7, substantially as described herein with reference to, as as shown in, Figures 1 to 3, Figures 4 to 6,
Figure 7, or Figure 8 of the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54080808A JPS5937335B2 (en) | 1979-06-28 | 1979-06-28 | Steel strip cooling equipment for continuous annealing |
| JP8149079A JPS5842254B2 (en) | 1979-06-29 | 1979-06-29 | Continuous annealing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2054661A true GB2054661A (en) | 1981-02-18 |
| GB2054661B GB2054661B (en) | 1983-03-16 |
Family
ID=26421788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8021345A Expired GB2054661B (en) | 1979-06-28 | 1980-06-30 | Docing steel strip in continuous annealing |
Country Status (10)
| Country | Link |
|---|---|
| AU (1) | AU530384B2 (en) |
| BR (1) | BR8003901A (en) |
| CA (1) | CA1133365A (en) |
| DE (1) | DE3023571C2 (en) |
| FR (1) | FR2460333B1 (en) |
| GB (1) | GB2054661B (en) |
| IT (1) | IT1174291B (en) |
| NL (1) | NL8003647A (en) |
| SE (1) | SE448308B (en) |
| SU (1) | SU1139376A3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0058607A1 (en) * | 1981-02-12 | 1982-08-25 | Stein Heurtey | Apparatus for rapid and controllable cooling in an annealing furnace with a neutral or reducing atmosphere |
| EP0086331A1 (en) * | 1982-01-13 | 1983-08-24 | Nippon Steel Corporation | Continuous heat treating line for mild and high tensile strength stell strips or sheets |
| EP0145485A2 (en) * | 1983-12-15 | 1985-06-19 | Mitsubishi Jukogyo Kabushiki Kaisha | Method of controlling the temperature of steel strip in the cooling zone of a continuous annealing furnace |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3330394A1 (en) * | 1983-07-29 | 1985-02-14 | Josef Gartner & Co, 8883 Gundelfingen | DEVICE FOR TEMPERATURE SPACES OF A BUILDING |
| JPH0796686B2 (en) * | 1986-09-09 | 1995-10-18 | 川崎製鉄株式会社 | Metal strip meandering prevention method |
| JP4840518B2 (en) | 2010-02-24 | 2011-12-21 | Ｊｆｅスチール株式会社 | Method for producing grain-oriented electrical steel sheet |
| DE102011117572A1 (en) * | 2011-01-26 | 2012-08-16 | Salzgitter Flachstahl Gmbh | High-strength multiphase steel with excellent forming properties |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3186698A (en) * | 1963-06-14 | 1965-06-01 | Midland Ross Corp | Heat treating apparatus |
| DE1608164B1 (en) * | 1967-11-23 | 1971-11-11 | Hoesch Ag | Use of a steel for the production of high-strength packaging tape |
| JPS5280208A (en) * | 1975-12-27 | 1977-07-05 | Chugai Ro Kogyo Kaisha Ltd | Method and apparatus for temperature control of material in heat treatment of metal strip |
| JPS5458609A (en) * | 1977-10-20 | 1979-05-11 | Nippon Steel Corp | Cooler and controlled cooling method for strip of high temperature |
-
1980
- 1980-06-18 AU AU59384/80A patent/AU530384B2/en not_active Ceased
- 1980-06-23 BR BR8003901A patent/BR8003901A/en not_active IP Right Cessation
- 1980-06-23 CA CA354,549A patent/CA1133365A/en not_active Expired
- 1980-06-23 IT IT49043/80A patent/IT1174291B/en active
- 1980-06-24 NL NL8003647A patent/NL8003647A/en not_active Application Discontinuation
- 1980-06-24 DE DE3023571A patent/DE3023571C2/en not_active Expired
- 1980-06-25 FR FR8014122A patent/FR2460333B1/en not_active Expired
- 1980-06-26 SU SU802937833A patent/SU1139376A3/en active
- 1980-06-27 SE SE8004780A patent/SE448308B/en not_active IP Right Cessation
- 1980-06-30 GB GB8021345A patent/GB2054661B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0058607A1 (en) * | 1981-02-12 | 1982-08-25 | Stein Heurtey | Apparatus for rapid and controllable cooling in an annealing furnace with a neutral or reducing atmosphere |
| EP0086331A1 (en) * | 1982-01-13 | 1983-08-24 | Nippon Steel Corporation | Continuous heat treating line for mild and high tensile strength stell strips or sheets |
| EP0145485A2 (en) * | 1983-12-15 | 1985-06-19 | Mitsubishi Jukogyo Kabushiki Kaisha | Method of controlling the temperature of steel strip in the cooling zone of a continuous annealing furnace |
| EP0145485A3 (en) * | 1983-12-15 | 1986-12-10 | Mitsubishi Jukogyo Kabushiki Kaisha | Method of controlling the temperature of steel strip in the cooling zone of a continuous annealing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8049043A0 (en) | 1980-06-23 |
| SE448308B (en) | 1987-02-09 |
| DE3023571A1 (en) | 1981-01-15 |
| IT1174291B (en) | 1987-07-01 |
| NL8003647A (en) | 1980-12-30 |
| SE8004780L (en) | 1980-12-29 |
| DE3023571C2 (en) | 1991-09-12 |
| AU5938480A (en) | 1981-01-08 |
| FR2460333B1 (en) | 1986-07-04 |
| AU530384B2 (en) | 1983-07-14 |
| FR2460333A1 (en) | 1981-01-23 |
| SU1139376A3 (en) | 1985-02-07 |
| CA1133365A (en) | 1982-10-12 |
| BR8003901A (en) | 1981-01-13 |
| GB2054661B (en) | 1983-03-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990630 |