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1. 发明专利

JPH03199364A SHEET TEMPERATURE CONTROL METHOD FOR ALLOYING FURNACE 失效
公开(公告)号：JPH03199364A
公开(公告)日：1991-08-30
申请号：JP33818889
申请日：1989-12-28
申请人： MITSUBISHI HEAVY IND LTD , KAWASAKI STEEL CO
发明人： TAUCHI KUNIAKI , SHIGEMOTO HARUMI , IKENAGA YUJI , IDE RYOICHI
IPC分类号： C23C2/28
摘要： PURPOSE:To lessen the change in sheet temp. and to improve the yield by adding the fresh gaseous fuel computed in correspondence to a change in sheet thickness, sheet speed, etc., at the time of controlling the heating temp. of the steel sheet by the flow rate of the gaseous fuel of a direct fire type burner. CONSTITUTION:The steel sheet is immersed into a hot dip plating bath and is then pulled up. The heating temp. of the steel sheet is controlled by regulating the flow rate of the gaseous fuel of the direct fire type burner of the alloying furnace. If the sheet thickness, sheet speed, target value of the sheet temp. and/or the target value of a plating deposition change, the fresh fuel gas is supplied at the flow rate computed by using equation (where, F: the additional flow rate of the fresh gaseous fuel, D: the change rate of the sheet thickness, Tss: the change rate of the target value of the sheet temp., Qds: the change rate of the target value of the plating deposition, V: the change rate of the sheet speed, C1 to C4: the constant) according to the above-mentioned change rates.

2. 发明专利

JPH02166267A ALLOYING FURNACE 失效
公开(公告)号：JPH02166267A
公开(公告)日：1990-06-26
申请号：JP31996988
申请日：1988-12-19
申请人： KAWASAKI STEEL CO , MITSUBISHI HEAVY IND LTD
发明人： IDE RYOICHI , IIDA YOSHIHIRO , SHIGEMOTO HARUMI , HYODO KANAAKI , HOSHI TOSHINOSUKE
IPC分类号： C23C2/06 , C23C2/28
摘要： PURPOSE:To easily set and change holding time and holding temp. by dividing a holding zone, opening the exhaust ducts provided to the upstream parts of the respective zones, providing an air introducing pipe to the inlet side of a first zone and providing the cooling devices to a second zone and the following zone. CONSTITUTION:An air introducing pipe 8 is provided to the inlet side of the holding zone 6 of an alloying furnace 4 and the temp. of exhaust gas introduced from a heating zone 5 is adjusted. Both the exhaust ducts 9a-9c and the shut-off valves 10a-10c are provided to the outlet sides of the divided zones 6a-6c of the holding zone 6 and connected to a connecting duct 11. Exhaust gas is diffused to the outside of the holding zone 6 from a discharge pipe 12. The zone dividing members 13a-13c are provided to the downstream parts of the opening parts of the respective exhaust ducts 9a-9c. The cooling devices 14b, 14c are provided to a second and third zones 6b, 6c. The number of a zone utilized for the holding zone is decided by plate passing velocity and the holding time. Thereby the defective proportion of a plated steel plate is reduced.

3. 发明专利

JPH02200760A STRIP TEMPERATURE CONTROL METHOD FOR HEATING FURNACE 失效
公开(公告)号：JPH02200760A
公开(公告)日：1990-08-09
申请号：JP1744789
申请日：1989-01-30
申请人： MITSUBISHI HEAVY IND LTD , KAWASAKI STEEL CO
发明人： TAUCHI KUNIAKI , SHIGEMOTO HARUMI , IIDA YOSHIHIRO , IDE RYOICHI
IPC分类号： C23C2/06 , C21D9/56 , C21D11/00 , C23C2/28
摘要： PURPOSE:To improve the responsiveness when parameter changes and to make uniform the strip temp. distribution in a thickness direction by computing the required fuel flow rate corresponding to the quantity of heat of which a strip is deprived, determining the fuel flow rate distribution pattern to respective burner groups and further determining the fuel flow rates to the respective burner groups. CONSTITUTION:The change in the respective parameters; the thickness, a width of the strip, a line speed, and target strip temp., is detected and the required total fuel flow rate Ft corresponding to the quantity of heat of which the strip is deprive is calculated, then the fuel flow rate distribution pattern to the respective burner groups is determined. Further, the fuel flow rates to the respective burner groups are determined by equation I. The fuel is passed at the above-mentioned flow rates to the respective burner groups for the prescribed period of time when the parameter changing part of the strip passes the burner groups in accordance with the determined fuel flow rates. In equation I, Fis is the optimum fuel flow rate (set value) of the i-th zone in the transverse direction of the strip; Ri is the constant to determine the fuel flow rate distribution pattern to the i-th zone (under the conditions expressed by equation II); N denotes the number of zones of the respective burner groups in the transverse direction of the strip.

4. 发明专利

JPH02166266A ALLOYING FURNACE HAVING FLOATER 失效
公开(公告)号：JPH02166266A
公开(公告)日：1990-06-26
申请号：JP31996888
申请日：1988-12-19
申请人： KAWASAKI STEEL CO , MITSUBISHI HEAVY IND LTD
发明人： SHIGEMOTO HARUMI , IIDA YOSHIHIRO , IDE RYOICHI , HYODO KANAAKI , HIRAI ETSURO
IPC分类号： C23C2/06 , C23C2/00 , C23C2/28
摘要： PURPOSE:To hold a strip for a long time and to prevent the generation of surface flaws by providing a cooling zone having a bend floater and a horizontal floater in succession to a holding zone. CONSTITUTION:The strip 2 leaving a plating pot 1 is heated to a specified temp. in a heating zone 13, held hot in a fixed time in the holding zone 8, and then cooled in the cooling zones 10, 12. The bend floater 11 for changing the course of a high-temp. alloyed strip 2 in a non-contact state is provided above the cooling zone 10 to prevent the generation of surface flaws due to the deposition of zinc on the roll surface. The cooling zone 12 having the horizontal floater 17 is arranged on the horizontal extension on the outlet side of the bend floater 11, and the strip 2 is traveled in a non-contact state. By this method, zinc plated steel sheet of good appearance which is sufficiently alloyed is obtained.

5. 发明专利

JPH0344425A METHOD FOR CONTROLLING TEMPERATURE OF STRIP IN HEATING FURNACE 失效
公开(公告)号：JPH0344425A
公开(公告)日：1991-02-26
申请号：JP17707889
申请日：1989-07-11
申请人： MITSUBISHI HEAVY IND LTD , KAWASAKI STEEL CO
发明人： TAUCHI KUNIAKI , IIDA YOSHIHIRO , KOHAMA TETSUYA , IDE RYOICHI
IPC分类号： C21D11/00 , C21D9/56
摘要： PURPOSE:To improve heat efficiency at the time of low loading by deciding the set value for furnace temp. and the set value for circulating flowing quantity of furnace gas base on heat load to a strip. CONSTITUTION:The set value for furnace temp. and the set value for hot gas blowing quantity (circulating flowing quantity of furnace gas) according to the load are inputted for each target value of strip temp. and each strip width to a process computer 16. The process computer 16 transmits the furnace temp. set value signal (b) and the hot gas blowing quantity set value signal (c) according to the actual load of each coil to a furnace temp. controller 3 and a pressure controller 10, respectively. In the case the heat load of the strip 20 is higher than the prescribed upper limit value, the permissible min. value is given as the set value for hot gas blowing quantity. In the case the heat load is lower than the lower limit value, the permissible max. value is given. In the case the heat load has a range between the upper limit value and the lower limit value, the set value for hot gas blowing quantity having a range between the permissible min. value and the permissible max. value, is given as function of the heat load. Therefore, the heat efficiency can be kept high over the whole load range.

6. 发明专利

JPH0320450A METHOD FOR CONTROLLING FLOATING DEVICE HAVING SIDE PLATE 失效
公开(公告)号：JPH0320450A
公开(公告)日：1991-01-29
申请号：JP15282289
申请日：1989-06-15
申请人： KAWASAKI STEEL CO , MITSUBISHI HEAVY IND LTD
发明人： SHIGEMOTO HARUMI , IIDA YOSHIHIRO , IDE RYOICHI , HYODO KANAAKI , HIRAI ETSURO
IPC分类号： C23C2/40 , C21D9/63
摘要： PURPOSE:To minimize reduction in the ability of correcting a meandering motion at the time of modifying sheet width by providing side plates freely movable in a sheet transverse direction in the side parts of a traveling strip-like material on a floating device and allowing the side plates to follow the modification of the sheet-width of the strip-like material. CONSTITUTION:Side plates 5 moving in a sheet transverse direction in the side parts of the moving line of a strip 3 are provided on a bend floating device 4 in which the strip 3 is floated and supported in a non-contact state by blowing fluid through nozzles 2 provided to the surface of a chamber 1. Each side plate 5 is constituted of a vertical side plate part 5a and a cover 5b extending from the lower end of the side plate part 5a and covering the surface of the chamber 1. When a modification occurs to the width of the strip 3 traveling by such a constitution, respective intervals between the side plates 3 and the strip 3 are properly regulated according to the modification. By this method, the meandering motion of the strip 3 can be corrected and stable conveyance can be carried out, and contact troubles, such as scuffing of edge, at the time of modifying width in particular can be prevented.

7. 发明专利

JPH02200762A METHOD FOR HEATING STEEL STRIP IN ALLOYING FURNACE 失效
公开(公告)号：JPH02200762A
公开(公告)日：1990-08-09
申请号：JP1744889
申请日：1989-01-30
申请人： MITSUBISHI HEAVY IND LTD , KAWASAKI STEEL CO
发明人： SHINYA KENJI , KATO TOSHIO , SHIGEMOTO HARUMI , IIDA YOSHIHIRO , IDE RYOICHI
IPC分类号： C23C2/06 , C23C2/28 , C23C2/40
摘要： PURPOSE:To easily and uniformly apply heating to a steel strip according to width by detecting the width of a steel strip to be treated, interrupting fuel supply to burners disposed in the positions outside the above strip width, and also reducing combustion air supply to minute flow rate. CONSTITUTION:Alloying treatment is carried out by heating a galvanized steel strip 1 continuously traveling through an alloying furnace 2 by means of cup burners 3a-3i disposed so that they face both sides of the steel strip 1. In the above alloying furnace 2, plural cup burne 3a-3i are disposed in the width direction of the steel strip 1. At the time of passing the steel strip 1, the width of the steel strip 1 is detected, and, according to the strip width, fuel supply to the burners 3a, 3i, etc., disposed on the outside of the strip width is interrupted or is substituted by inert gas supply. Simultaneously, combustion air supply is reduced and the combustion air is kept flowing at minute flow rate. By this method, temp. rise at the ends of the steel strip 1 can be controlled and temp. distribution in the width direction can be uniformized, by which the resulting alloyed layer can be uniformized.

8. 发明专利

JPH02166236A FLOATER HAVING SIDE PLATE 失效
公开(公告)号：JPH02166236A
公开(公告)日：1990-06-26
申请号：JP31996788
申请日：1988-12-19
申请人： KAWASAKI STEEL CO , MITSUBISHI HEAVY IND LTD
发明人： SHIGEMOTO HARUMI , IIDA YOSHIHIRO , IDE RYOICHI , HYODO KANAAKI , HIRAI ETSURO
IPC分类号： C23C2/40 , C21D9/63
摘要： PURPOSE:To stably convey a long-sized band-shaped body such as a band steel in a non-contact and levitated state without meandering the body by forming a floater for supporting the body in a non-contact state with a chamber provided with many nozzles for injecting a high-pressure fluid onto the body and a side plate movable on the nozzle forming surface in the cross direction of the body. CONSTITUTION:When the long-sized band-shaped body such as a band steel 3 is conveyed without contacting other equipment in a levitated state, a high- pressure gas is injected from many nozzles 2 in the conveying surface of a chamber 1, and the steel 3 is levitated and conveyed without contacting. In this case, the side plates 5 are provided to surround the steel 3, and the steel 3 is levitated and conveyed regardless of the width of the steel 3 by changing the distance between the plates. The side plate 5 has a side plate part 5a and a nozzle cover part 5b, and a bracket 5c is extended from the upper end of the side plate part 5a to prevent the abnormal levitation of the steel 3.

9. 发明专利

JPH03146649A PRODUCTION OF ALLOYING GALVANIZED STEEL STRIP 失效
公开(公告)号：JPH03146649A
公开(公告)日：1991-06-21
申请号：JP28395289
申请日：1989-10-31
申请人： KAWASAKI STEEL CO
发明人： IDE RYOICHI , IIDA YOSHIHIRO
IPC分类号： C23C2/28
摘要： PURPOSE:To stably obtain a product of optimum degree of alloying by a simplified means by increasing the heating and temp.-rise rate of a steel strip in a heating zone of an alloying furnace to a specific value or above. CONSTITUTION:A steel strip 1 galvanized in a zinc bath 2 is subjected to alloying treatment by means of an alloying furnace 4 having a heating zone 5 and a holding zone 6, by which an alloying galvanized steel strip is obtained. In the above method, the heating and temp.-rise rate of the steel strip 1 in the heating zone 5 is regulated to >=2 deg.C/sec. By this method, the transition temp. of emissivity moves to the high-temp. side and the emissivity is held constant until a temp. of 420 deg.C at which plating is melted to the vicinity of 550 deg.C is reached. As a result, at the time of measuring the temp. of the steel strip 1 by means of a radiation thermometer 7 at the outlet of the heating zone 5, the true temp. of the steel strip 1 can be measured and the purpose can be accomplished. When the above heating and temp.-rise rate is lower than 2 deg.C/sec, the transition temp. of the emissivity becomes

10. 发明专利

JPH02122058A ALLOYING FURNACE HAVING HOLDING ZONE PROVIDED WITH COOLING FUNCTION 失效
公开(公告)号：JPH02122058A
公开(公告)日：1990-05-09
申请号：JP27244788
申请日：1988-10-28
申请人： KAWASAKI STEEL CO
发明人： IDE RYOICHI , SHIGEMOTO HARUMI , IIDA YOSHIHIRO
IPC分类号： C23C2/06 , C23C2/28
摘要： PURPOSE:To make cooling efficient and to adjust the holding time by arranging a holding zone on the downstream side of the heating zone of the title alloying furnace, providing a cooler to the holding zone, and furnishing a cooling fluid discharge means on both side walls in the cross direction of a traveling strip. CONSTITUTION:The strip 3 immediately after being plated is heated to a specified temp. in the heating zone (not shown in the figure), and then held at a constant temp. in the holding zone 6 to alloy the plating metal. In this alloying furnace, the heating zone 6 is divided into >=2 zones 6a-6c by partition members 13b and 13c, and a cooler (not shown in the figure) is provided to each zone. The cooling fluid discharge means consisting of discharge ports 63a-63c and 64 and doors 65a-65c and 66a-66c is provided to both side walls 61a-61c and 62a-62c in the cross direction of the traveling strip 3. By this method, the strip 3 is efficiently cooled, a constant alloying temp. is surely maintained, and the holding time can be optionally and accurately adjusted.

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