JPH093613A - Alloying control method for alloyed hot dip galvanized steel sheet - Google Patents
Alloying control method for alloyed hot dip galvanized steel sheetInfo
- Publication number
- JPH093613A JPH093613A JP15466595A JP15466595A JPH093613A JP H093613 A JPH093613 A JP H093613A JP 15466595 A JP15466595 A JP 15466595A JP 15466595 A JP15466595 A JP 15466595A JP H093613 A JPH093613 A JP H093613A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- alloying
- warp
- amount
- width direction
- 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.)
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- Coating With Molten Metal (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
(57)【要約】
【目的】 本発明は合金化溶融亜鉛鍍金鋼板の合金化制
御方法にに関する。
【構成】 ガスワイピンクノズル４の上部に設置した反
り測定センサー９はガスワイピンクノズル４を通過した
付着量の調整された鋼板１の幅方向の反り量を連続的に
計測し、その測定値が制御装置７に入力される。制御装
置７は鋼板１の表裏面の幅方向の反り量の測定値に対応
して、加熱炉５内の各ブロック５ａ〜５ｌに区分した燃
焼領域に、亜鉛鍍金された鋼板３の合金化に必要な燃料
ガスの流量をブロック毎の調節弁６ａ〜６ｌで調整して
供給する。
【効果】 鋼板の反りがあっても、鋼板幅方向に対して
均一な合金化処理ができ、耐パウダリング性に優れた上
記鋼板の製造が可能である。
(57) [Summary] [Object] The present invention relates to a method for controlling alloying of a galvannealed steel sheet. [Structure] A warp measurement sensor 9 installed on the upper part of the gas wai pink nozzle 4 continuously measures the amount of warp in the width direction of the steel plate 1 having the adhered amount passing through the gas wai pink nozzle 4 and the measured value. Is input to the control device 7. The control device 7 corresponds to the measured values of the warp amount of the front and back surfaces of the steel plate 1 in the combustion region divided into the blocks 5a to 5l in the heating furnace 5 and alloys the galvanized steel plate 3 with each other. The required flow rate of the fuel gas is adjusted and supplied by the control valves 6a to 6l for each block. [Effect] Even if the steel sheet is warped, the alloying treatment can be performed uniformly in the width direction of the steel sheet, and the above steel sheet having excellent powdering resistance can be manufactured.
Description
【０００１】[0001]
【産業上の利用分野】本発明は合金化溶融亜鉛鍍金鋼板
の合金化制御方法に係わり、詳しくは適正な合金化を板
の全面において均一に行う合金化制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloying control method for alloyed molten zinc plated steel sheet, and more particularly to an alloying control method for performing proper alloying uniformly on the entire surface of the sheet.
【０００２】[0002]
【従来の技術】この種の合金化溶融亜鉛鍍金鋼板の合金
化制御方法として特開平１−１７７３５１号公報、特開
平２−２００７６２号公報により開示された技術があ
る。2. Description of the Related Art As a method of controlling alloying of this type of alloyed molten zinc plated steel sheet, there are techniques disclosed in JP-A-1-177351 and JP-A-2-200762.
【０００３】特開平１−１７７３５１号公報に開示され
る技術は、溶融亜鉛鍍金鋼板の合金化処理において、合
金化加熱に高周波誘導加熱炉を用い、合金化処理後の鍍
金層の合金化度をオンライン合金化度計により連続的に
測定し、この測定値と演算器内に設定してある基準値と
の偏差を求め、偏差に応じて誘導加熱炉へ投入する電力
を制御するものである。The technique disclosed in Japanese Patent Application Laid-Open No. 1-177351 uses a high-frequency induction heating furnace for alloying heating in the alloying treatment of a molten zinc plated steel sheet, and determines the degree of alloying of the plated layer after the alloying treatment. It continuously measures with an online alloying degree meter, finds a deviation between the measured value and a reference value set in a calculator, and controls the electric power supplied to the induction heating furnace according to the deviation.
【０００４】特開平２−２００７６２号公報に記載され
る技術は、カップバーナを幅方向に複数個配置した加熱
炉（合金化炉）において、鋼板の幅を検出して、その板
幅に応じて同板幅の外側に配置されたバーナの燃料を遮
断するとともに、燃焼用空気の供給を減少し、微小流量
を流しておくものである。The technique disclosed in Japanese Patent Laid-Open No. 2-200762 discloses a heating furnace (alloying furnace) in which a plurality of cup burners are arranged in the width direction, and detects the width of a steel plate and determines the width according to the width. The fuel of the burner arranged outside the plate width is shut off, the supply of combustion air is reduced, and a minute flow rate is kept flowing.
【０００５】[0005]
【発明が解決しようとする課題】合金化溶融亜鉛鍍金鋼
板の製造工程では、溶融亜鉛鍍金浴から鋼板が立上がり
ガスワイピング、合金化処理、保熱、冷却等の工程を経
て、トップロールに到るまでの距離が長いため、鋼板に
反りを生じる。そのために、特開平１−１７７３５１号
公報に開示される方法を実施しても、鋼板の反りに起因
した付着量の不均一を生じるという問題点がある。In the manufacturing process of alloyed molten zinc plated steel sheet, the steel sheet rises from the molten zinc plating bath and reaches the top roll through steps such as gas wiping, alloying treatment, heat retention and cooling. Due to the long distance to, the steel plate warps. Therefore, even if the method disclosed in Japanese Patent Application Laid-Open No. 1-177351 is carried out, there is a problem in that the adhered amount becomes uneven due to the warp of the steel sheet.
【０００６】特開平２−２００７６２号公報に記載され
る方法においても、鋼板の反りにより幅方向の付着量が
不均一になるという問題点は解決することができない。The method described in Japanese Patent Application Laid-Open No. 2-200762 cannot solve the problem that the amount of adhesion in the width direction becomes uneven due to the warp of the steel sheet.
【０００７】本発明は上記のような問題点を解決するた
めになされたもので、溶融亜鉛鍍金鋼板が幅方向の反り
を生じても、均一な合金化処理のできる合金化制御方法
を提供することを目的とする。The present invention has been made to solve the above-mentioned problems, and provides an alloying control method capable of performing a uniform alloying process even when a molten zinc plated steel sheet warps in the width direction. The purpose is to
【０００８】[0008]
【課題を解決するための手段と作用】本発明は、付着量
を調整した溶融亜鉛鍍金鋼板を加熱して合金化処理する
にあたり、鋼板の板幅方向にｎブロックに分割した加熱
手段を設けて、ガスワイピングノズルの上部に設けた反
り量測定センサーにより検出した溶融亜鉛鍍金鋼板の幅
方向の反り量に応じて、各ブロック別、表裏別に前記加
熱手段の出力制御を行うことを特徴とする合金化溶融亜
鉛鍍金鋼板の合金化制御方法である。According to the present invention, a heating means divided into n blocks in the plate width direction of the steel plate is provided for heating and alloying the molten zinc plated steel plate with the adhered amount adjusted. An alloy characterized in that the output of the heating means is controlled for each block and front and back according to the amount of warpage in the width direction of the molten zinc-plated steel sheet detected by the amount-of-warp measurement sensor provided on the gas wiping nozzle. This is a method for controlling the alloying of a chemical-melted zinc-plated steel sheet.
【０００９】反り量測定センサーにより測定された反り
量に応じて、ｎブロックに分割された加熱手段がフィー
ドフォワード制御されるので、溶融亜鉛鍍金鋼板に反り
があったとしても、幅方向の合金化度が均一に保たれ
る。The heating means divided into n blocks is feed-forward controlled according to the warp amount measured by the warp amount measuring sensor, so that even if the molten zinc plated steel sheet has a warp, it is alloyed in the width direction. The degree is kept uniform.
【００１０】[0010]
【実施例】以下に本発明の実施例を図によって詳述す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
【００１１】図１は本発明を実施する合金化溶融亜鉛め
っき鋼板の製造工程を示す概略図であり、図２は図１に
示す加熱炉の横断面図である。FIG. 1 is a schematic view showing a manufacturing process of a galvannealed steel sheet for carrying out the present invention, and FIG. 2 is a transverse sectional view of the heating furnace shown in FIG.
【００１２】図１、図２において、５は加熱炉で鋼板表
面の板幅方向に対応する各６ブロック５ａ〜５ｆ及び鋼
板裏面の板幅方向に対応する各６ブロック５ｇ〜５ｌを
設けて燃焼領域を区分し、各ブロックに単数又は複数の
カップバーナを設け、ブロック毎に流量調節弁を設けて
燃料供給配管に接続されている。In FIGS. 1 and 2, reference numeral 5 denotes a heating furnace in which six blocks 5a to 5f corresponding to the plate width direction on the front surface of the steel plate and six blocks 5g to 5l corresponding to the plate width direction on the back surface of the steel plate are provided and burned. The region is divided, and each block is provided with a single or a plurality of cup burners, and a flow rate control valve is provided for each block and connected to the fuel supply pipe.
【００１３】ブロック毎の流量調節弁６ａ〜６ｆ及び６
ｇ〜６ｌは制御装置７に接続されており、各ブロック内
のカップバーナの燃焼制御が出来るようにしている。Flow control valves 6a to 6f and 6 for each block
g to 6l are connected to the control device 7 so that combustion control of the cup burner in each block can be performed.
【００１４】一方、ガスワイピングノズル４の上部に反
り測定センサー９を設置し、ここから得られる測定値が
連続的に制御装置７に入力されるようにしている。On the other hand, a warp measuring sensor 9 is installed above the gas wiping nozzle 4 so that measured values obtained from the warp measuring sensor 9 are continuously input to the control device 7.
【００１５】また、制御装置７には溶融亜鉛めっき鋼板
の合金化処理に必要なデータとして合金化度データ、付
着量データその他データが入力されるようにしている。Further, the controller 7 is inputted with the alloying degree data, the adhesion amount data and other data as data necessary for the alloying treatment of the hot dip galvanized steel sheet.
【００１６】上記製造工程において、板寸法０．６×１
２１９ｍｍの熱処理された鋼板１がスナウト１０を介し
て溶融亜鉛浴２内に導入され鍍金される。鋼板１は溶融
亜鉛浴２内のシンクロール３で反転された後に、ガスワ
イピンクノズル４で目標付着量（片面亜鉛付着量６０ｇ
／ｍ2 ）になるように調整され、加熱炉５で合金化処理
される。その後、保熱装置１２、冷却装置１３で保熱、
冷却処理を経てトップロール１４を介して水平に引き抜
かれる。ここにおいて、ガスワイピンクノズル４の上部
に設置した反り測定センサー９はガスワイピンクノズル
４を通過した付着量の調整された鋼板１の幅方向の反り
量を連続的に計測し、その測定値が制御装置７に入力さ
れる。その結果を表１に示す。表１において反り量が正
であることは、当該測定側に鋼板が寄っていることを意
味し、反り量が負であることは、当該測定側と反対側に
鋼板が寄っていることを示す。即ち、鋼板の一端面であ
るブロック５ａ（表側）において反り量が２mm、対応す
る裏面のブロック５ｇにおいて反り量が−２mmであるの
は、鋼板が２mm表側に寄っていることを示す。In the above manufacturing process, the plate size is 0.6 × 1.
A 219 mm heat-treated steel plate 1 is introduced into a molten zinc bath 2 through a snout 10 and plated. The steel plate 1 is turned over by the sink roll 3 in the molten zinc bath 2, and then the target amount of adhesion (the amount of zinc adhesion on one side of 60 g by the gas wai pink nozzle 4).
/ M 2 ) and alloyed in the heating furnace 5. After that, heat retention by the heat retention device 12 and the cooling device 13,
After cooling, it is horizontally pulled out via the top roll 14. Here, the warp measurement sensor 9 installed on the upper part of the gas-wai pink nozzle 4 continuously measures the amount of warp in the width direction of the steel plate 1 having the adhered amount passing through the gas-wai pink nozzle 4 and measured value. Is input to the control device 7. Table 1 shows the results. In Table 1, a positive amount of warp means that the steel plate is closer to the measurement side, and a negative amount of warp means that the steel plate is closer to the side opposite to the measurement side. . That is, a warp amount of 2 mm in the block 5a (front side) which is one end face of the steel plate and a warp amount of -2 mm in the corresponding back face block 5g indicates that the steel plate is 2 mm closer to the front side.
【００１７】[0017]
【表１】 [Table 1]
【００１８】制御装置７は入力された鋼板１の表裏面の
幅方向の反り量の測定値に対応して、加熱炉５内の各ブ
ロック５ａ〜５ｌに区分した燃焼領域に、亜鉛鍍金され
た鋼板３の合金化に必要な燃料ガスの流量をブロック毎
の調節弁６ａ〜６ｌで表１に示すように調整して供給す
る。即ち、鋼板が寄っている面ではＧ／Ｇ0 を１以下と
して燃料流量を基準流量より少なくし、鋼板が離れてい
る側ではＧ／Ｇ0 を１以上として燃料流量を基準流量よ
り多くする。反り量に対してどの程度のＧ／Ｇ 0 とする
かについては、実験により関係式を求めて設定する。合
金化処理された溶融亜鉛鍍金鋼板１はオンライン合金化
度計１１等によっ連続的に測定され、測定結果が制御装
置７に入力されて、基準流量であるＧ0 の設定に用いら
れる。基準流量Ｇ0 は、制御装置７によって合金化度を
目標値にするような値に、表裏面別々に設定される。８
ａ、８ｂは表裏面それぞれの全体の燃料流量を制御する
燃料流量弁である。The control device 7 controls the front and back surfaces of the input steel plate 1.
Corresponding to the measured value of the amount of warp in the width direction, each block in the heating furnace 5
Zinc plating is applied to the combustion area divided into locks 5a to 5l.
Flow rate of fuel gas required for alloying
It is supplied after adjusting as shown in Table 1 with the control valves 6a to 6l.
You. That is, G / G0Is less than or equal to 1
To reduce the fuel flow rate below the reference flow rate
Side is G / G0Is 1 or more and the fuel flow rate is the reference flow rate.
Do more. How much G / G against the amount of warpage 0To be
About, is set by obtaining the relational expression by experiments. Combination
Online alloying of the galvanized molten zinc plated steel sheet 1
It is continuously measured by a gyro 11 and the measurement result is controlled by the control device.
It is input to the unit 7 and is the reference flow rate G0Used to set
It is. Reference flow rate G0Control the alloying degree by the controller 7.
The values are set to the target values separately for the front and back surfaces. 8
a and 8b control the total fuel flow rate on each of the front and back surfaces.
It is a fuel flow valve.
【００１９】図３は溶融亜鉛鍍金鋼板の幅方向の反り量
を示す図である。反り量は鋼板１の幅方向で中心から両
端部に従って表側に反っている。FIG. 3 is a diagram showing the amount of warpage in the width direction of the hot dip galvanized steel sheet. The warp amount is warped from the center to the front side in the width direction of the steel sheet 1 along both ends.
【００２０】上記の反り量を生じている付着量の調整さ
れた鋼板１を加熱炉５で合金化処理する場合、本発明で
は鋼板１の幅方向の反り量に対応した燃料ガスの流量を
ブロック毎の調節弁６ａ〜６ｌで調整して供給し、各ブ
ロック５ａ〜５ｌの燃焼領域で燃焼させて鋼板１の加熱
による合金化処理を行った。In the case of alloying the steel sheet 1 having the above-mentioned amount of warpage and having the adhered amount adjusted in the heating furnace 5, according to the present invention, the flow rate of the fuel gas corresponding to the amount of warpage of the steel sheet 1 in the width direction is blocked. Each of the control valves 6a to 6l was adjusted and supplied, and burned in the combustion region of each of the blocks 5a to 5l to heat the steel sheet 1 for alloying treatment.
【００２１】図４は鋼板の表側の幅方向の合金化度
（％）を示す図であり、図５は図４に対応する鋼板１の
裏側の幅方向の合金化度（％）を示す図である。図４、
図５において、本発明例を実線で示し、従来の燃料ガス
の流量による制御方法を比較例として点線で示した。FIG. 4 is a diagram showing the alloying degree (%) in the width direction on the front side of the steel sheet, and FIG. 5 is a diagram showing the alloying degree (%) in the width direction on the back side of the steel sheet 1 corresponding to FIG. Is. Figure 4,
In FIG. 5, the present invention example is shown by a solid line, and the conventional control method by the flow rate of the fuel gas is shown by a dotted line as a comparative example.
【００２２】図４、図５から明らかなように、本発明で
は鋼板の表裏が共に、板幅方向に均一な合金化度を得た
（±０．５％）のに対して、比較例では鋼板の表裏が共
に板幅方向の合金化度分布は反り量に比例してばらつい
ている（±２％）。As is clear from FIGS. 4 and 5, in the present invention, both the front and back of the steel sheet obtained a uniform degree of alloying in the sheet width direction (± 0.5%), whereas in the comparative example. The distribution of alloying degree in the width direction of both the front and back sides of the steel sheet varies in proportion to the amount of warpage (± 2%).
【００２３】上記実施例で加熱炉はガス加熱方式を用い
たが、反り量の補正を、ブロック別に燃焼制御可能なガ
ス加熱方式で行ない、応答性に優れた誘導加熱炉等で、
ある程度の合金化処理を行なう、組合わせ型の加熱炉を
用いることも出来る。Although the gas heating system was used for the heating furnace in the above embodiment, the amount of warpage is corrected by the gas heating system capable of combustion control for each block, and the induction heating furnace having excellent responsiveness is used.
It is also possible to use a combination type heating furnace which performs alloying treatment to some extent.
【００２４】[0024]
【発明の効果】以上のように、本発明によれば、回避困
難な鋼板の反り量が有っても、鋼板の幅方向に対して均
一な合金化処理が出来るので、耐パウダリング性に優れ
た合金化溶融亜鉛めっき鋼板の製造が可能である。As described above, according to the present invention, even if there is a warp amount of the steel sheet that is difficult to avoid, the alloying treatment can be performed uniformly in the width direction of the steel sheet, so that the powdering resistance can be improved. It is possible to manufacture an excellent alloyed hot-dip galvanized steel sheet.
【図１】本発明の方法を実施する合金化溶融亜鉛めっき
鋼板の製造工程の概略図てある。FIG. 1 is a schematic view of a manufacturing process of a galvannealed steel sheet for carrying out the method of the present invention.
【図２】図１に示す加熱炉の横断面図である。FIG. 2 is a cross-sectional view of the heating furnace shown in FIG.
【図３】本発明による溶融亜鉛鍍金鋼板の幅方向の反り
量を示す図である。FIG. 3 is a diagram showing the amount of warpage in the width direction of a molten zinc plated steel sheet according to the present invention.
【図４】本発明の鋼板の表側の幅方向の合金化度（％）
を示す図である。FIG. 4 is an alloying degree (%) in the width direction on the front side of the steel sheet of the present invention.
FIG.
【図５】図４に対応する鋼板３の裏側の幅方向の合金化
度（％）を示す図である。5 is a diagram corresponding to FIG. 4 and showing a degree of alloying (%) in the width direction on the back side of the steel plate 3. FIG.
１ 鋼板（溶融亜鉛鍍金鋼板） ２ 溶融亜鉛浴 ３ シンクロール ４ ガスワイピングノズル ５ 加熱炉 ５ａ〜５ｌ ブロック（加熱炉内） ６ 調節弁６ａ〜６ｌ ７ 制御装置 ８ａ、８ｂ 燃料流量弁 ９ 反り量測定センサー １０ スナウト １１ オンライン合金化度計 １２ 保熱装置 １３ 冷却装置 １４ トップロール DESCRIPTION OF SYMBOLS 1 Steel plate (molten zinc plated steel plate) 2 Molten zinc bath 3 Sink roll 4 Gas wiping nozzle 5 Heating furnace 5a-5l Block (inside heating furnace) 6 Control valves 6a-6l 7 Control device 8a, 8b Fuel flow valve 9 Warp measurement Sensor 10 Snout 11 Online alloying degree meter 12 Heat retention device 13 Cooling device 14 Top roll
Claims (1)
熱して合金化処理するにあたり、鋼板の板幅方向にｎブ
ロックに分割した加熱手段を設けて、ガスワイピングノ
ズルの上部に設けた反り量測定センサーにより検出した
溶融亜鉛鍍金鋼板の幅方向の反り量に応じて、各ブロッ
ク別、表裏別に前記加熱手段の出力制御を行うことを特
徴とする合金化溶融亜鉛鍍金鋼板の合金化制御方法。1. When heating a galvanized steel sheet with an adjusted amount of deposit to perform alloying treatment, a heating means divided into n blocks in the sheet width direction of the steel sheet is provided, and a warp provided above the gas wiping nozzle is provided. According to the amount of warp in the width direction of the molten zinc-plated steel sheet detected by the quantity measurement sensor, the output control of the heating means is performed for each block, front and back, and an alloying control method for alloyed molten zinc-plated steel sheet. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07154665A JP3114572B2 (en) | 1995-06-21 | 1995-06-21 | Method for controlling alloying of galvannealed steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07154665A JP3114572B2 (en) | 1995-06-21 | 1995-06-21 | Method for controlling alloying of galvannealed steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH093613A true JPH093613A (en) | 1997-01-07 |
| JP3114572B2 JP3114572B2 (en) | 2000-12-04 |
Family
ID=15589222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07154665A Expired - Fee Related JP3114572B2 (en) | 1995-06-21 | 1995-06-21 | Method for controlling alloying of galvannealed steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3114572B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064356A (en) * | 1999-12-29 | 2001-07-09 | 이구택 | A method for improving the powdering of alloyed melting galvanized sheet iron |
| KR100964904B1 (en) * | 2007-09-20 | 2010-06-23 | 주식회사 포스코 | Heater for Annealing Furnace |
-
1995
- 1995-06-21 JP JP07154665A patent/JP3114572B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064356A (en) * | 1999-12-29 | 2001-07-09 | 이구택 | A method for improving the powdering of alloyed melting galvanized sheet iron |
| KR100964904B1 (en) * | 2007-09-20 | 2010-06-23 | 주식회사 포스코 | Heater for Annealing Furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3114572B2 (en) | 2000-12-04 |
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