JPH03199366A - Device for alloying galvanized product - Google Patents
Device for alloying galvanized productInfo
- Publication number
- JPH03199366A JPH03199366A JP33873789A JP33873789A JPH03199366A JP H03199366 A JPH03199366 A JP H03199366A JP 33873789 A JP33873789 A JP 33873789A JP 33873789 A JP33873789 A JP 33873789A JP H03199366 A JPH03199366 A JP H03199366A
- Authority
- JP
- Japan
- Prior art keywords
- alloying
- heating
- steel strip
- floater
- 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.)
- Granted
Links
- 238000005275 alloying Methods 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 13
- 239000008397 galvanized steel Substances 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- 238000005246 galvanizing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 208000034699 Vitreous floaters Diseases 0.000 abstract description 24
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011701 zinc Substances 0.000 abstract description 12
- 229910052725 zinc Inorganic materials 0.000 abstract description 12
- 238000000227 grinding Methods 0.000 description 8
- 238000007747 plating Methods 0.000 description 8
- 238000002791 soaking Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鋼帯に連続的に溶融亜鉛めっきを施こしたのち
の加熱合金化処理を施こすための合金化装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alloying apparatus for continuously hot-dip galvanizing a steel strip and then subjecting it to heat alloying treatment.
従来の溶融亜鉛めっき後の合金化方法を第２図によって
説明する。A conventional alloying method after hot-dip galvanizing will be explained with reference to FIG.
亜鉛めっきを施こされようとする鋼帯１は先ず前処理炉
２にて還元焼鈍され約４５０℃に冷却されたのち、大気
に曝されることなく溶融亜鉛槽３に導入され、ジンクロ
ール４により上方に方向転換され、該亜鉛槽３より導き
出される。The steel strip 1 to be galvanized is first reductively annealed in a pretreatment furnace 2 and cooled to about 450°C, then introduced into a molten zinc tank 3 without being exposed to the atmosphere, and then subjected to a zinc roll 4. The zinc tank 3 is turned upward and led out of the zinc tank 3.
この間に鋼帯表面に亜鉛めっきがなされる。During this time, the surface of the steel strip is galvanized.
亜鉛槽３から取出されためっき鋼帯は表面の過剰の溶融
亜鉛を除去するためにエアーナイフ５により除去され、
適正厚さにめっき層を制御される。しかるのち、真上に
設けられた誘導加熱装置６により所定温度近くまで先ず
加熱され、次いで上方に設けられたガスバーナを備えた
加熱炉７にて所定温度まで加熱される。次いで真上の保
温炉８に送られて亜鉛めっき層を加熱拡散させて母材の
鉄と合金化させる。しかるのち、急冷帯９に送られて冷
却され、表面の合金化めっき層を冷却凝固させる。合金
化めっき層がロールに付着しない状態になる約３２０℃
まで冷却されためっき鋼帯は、この段階でトップロール
１０に到達し、こ＼で水平方向に方向を転じて更に冷却
室１１にて低温に冷却される。The plated steel strip taken out from the zinc tank 3 is removed by an air knife 5 to remove excess molten zinc on the surface.
The plating layer is controlled to an appropriate thickness. Thereafter, it is first heated to near a predetermined temperature by an induction heating device 6 provided directly above, and then heated to a predetermined temperature in a heating furnace 7 equipped with a gas burner provided above. Next, the galvanized layer is sent to a heat insulating furnace 8 directly above, where the galvanized layer is heated and diffused to be alloyed with the iron base material. Thereafter, it is sent to a quenching zone 9 and cooled, and the alloyed plating layer on the surface is cooled and solidified. Approximately 320℃, where the alloyed plating layer does not adhere to the roll.
At this stage, the plated steel strip that has been cooled to a temperature reaches the top roll 10, where it is turned horizontally and further cooled to a low temperature in a cooling chamber 11.
なお、−船釣にはエアーナイフ５と誘導加熱装置６の間
には冷風防止板が設けられている。In addition, for boat fishing, a cold air prevention plate is provided between the air knife 5 and the induction heating device 6.
従来の合金化装置は下のジンクロール４と上方のトップ
ロール１０間の距離を、めっき鋼帯の振動抑制及び建屋
建設費用の点から約６０ｍ以内に納める必要がある。従
って、めっき層を加熱・拡散して合金化するための条件
としては約２０秒と短時間加熱を余儀なくされるので高
温での加熱処理を必要とする。即ち、合金化条件として
は高温でかつ短時間の加熱を採らざるを得ない。ところ
が合金化時間−合金化温度−パウダリーブ量の相関を第
３図に示すが、第３図より合金化時間が２０秒であると
約５７５℃で加熱保持する必要があが、合金化めっき層
の加工性の指標になるパウダリング（Ｐｏｕｄｅｒ ｉ
ｎｇ）性は約５ ｍｇと芳しくない。これは合金化の温
度が高温になるほど加工性の良好なζ相に代わって脆弱
なδ、相反びＦ相が増大するからである。In conventional alloying equipment, the distance between the lower zinc roll 4 and the upper top roll 10 must be kept within about 60 m from the viewpoint of vibration suppression of the plated steel strip and building construction costs. Therefore, the conditions for heating and diffusing the plating layer to form an alloy require heating for a short period of about 20 seconds, which necessitates heat treatment at a high temperature. That is, the alloying conditions must be high temperature and short heating time. However, the correlation between alloying time, alloying temperature, and amount of powder leave is shown in Figure 3.As shown in Figure 3, if the alloying time is 20 seconds, it is necessary to heat and hold at approximately 575°C, but the alloyed plating Powdering, which is an indicator of layer workability
ng) The quality is not good at about 5 mg. This is because as the alloying temperature increases, the ζ phase, which has good workability, is replaced by the brittle δ, F phase, and F phase.
本発明は上記技術水準に鑑み、この種従来袈裟の不具合
を解消し、パウダリング量が少なくくなるように比較的
低温で合金化処理ができる溶融亜鉛めっきの合金化装置
を提供しようとするものである。The present invention has been made in view of the above-mentioned state of the art, and aims to provide an alloying apparatus for hot-dip galvanizing that can eliminate the problems of this type of conventional cassettes and perform alloying treatment at a relatively low temperature so as to reduce the amount of powdering. It is.
本発明は鋼帯に亜鉛めっきを施こす溶融亜鉛槽、亜鉛め
っきされた鋼帯を加熱するための該溶融亜鉛槽の上方に
設けられた垂直方向に延びた加熱炉、加熱された亜鉛め
っき鋼帯の進行方向を変えるための該加熱炉の上方に設
けられたフロータ、方向転換された加熱亜鉛めっき鋼帯
を更に加熱する加熱炉、加熱亜鉛めっき鋼帯を冷却する
ための該加熱炉に続いて設けられた急冷室、該急冷室に
続いて設けられたトップロール、該トップロールに続い
て設けられた冷却塔及び水冷槽よりなることを特徴とす
る溶融亜鉛めっきの合金化装置である。The present invention relates to a molten zinc bath for galvanizing steel strip, a vertically extending heating furnace provided above the molten zinc bath for heating the galvanized steel strip, and a heating furnace for heating galvanized steel. A floater provided above the heating furnace for changing the traveling direction of the strip, a heating furnace for further heating the heated galvanized steel strip whose direction has been changed, and a heating furnace following the heating furnace for cooling the heated galvanized steel strip. This alloying apparatus for hot dip galvanizing is characterized by comprising a quenching chamber provided in the quenching chamber, a top roll provided following the quenching chamber, a cooling tower and a water cooling tank provided subsequent to the top roll.
すなわち、本発明は第２図で説明した従来の合金化装置
のトップロール４の代わりに、先ず非接触でめっき鋼帯
の方向転換ができるガスフロータ、電磁式のフロータも
しくは両者の組合せのフロータを設置し、同時に従来装
置の急冷帯９を撤去して保温炉をフロータの近傍まで延
長して設置し、かつ方向転換用のフロータの直後に、め
っき鋼帯の加熱を引続いて行うために加熱装置を設置し
たことを特徴とするものである。That is, the present invention first installs a gas floater, an electromagnetic floater, or a combination of both floaters that can change the direction of the plated steel strip without contact, instead of the top roll 4 of the conventional alloying apparatus explained in FIG. At the same time, the quenching zone 9 of the conventional device was removed, a heat retention furnace was installed extending to the vicinity of the floater, and a heating device was installed immediately after the direction change floater to continue heating the plated steel strip. It is characterized by the fact that it has been installed.
加熱装置は誘導加熱とガス加熱を組み合わせた方式でも
よいし、ガス加熱単独でもよく、この方向転換部では加
熱・均熱が約５秒以上とれるように加熱・均熱設備を設
けることが好ましい。しかるのち、合金化めっき鋼帯を
冷却するための急冷室を設け、約３２０℃以下に鋼帯を
冷却したのち、トップロールとなるデフレクタ−ロール
により例えば下方に方向転換するようにするのが好まし
い。The heating device may be a combination of induction heating and gas heating, or may be gas heating alone, and it is preferable to provide heating and soaking equipment in this direction change section so that heating and soaking can be performed for about 5 seconds or more. After that, it is preferable to provide a quenching chamber for cooling the alloyed plated steel strip, cool the steel strip to about 320° C. or lower, and then change the direction, for example, downward, by a deflector roll serving as a top roll. .
従来のトップロールの代わりに非接触でめっき鋼帯の方
向転換が可能なフロータを設置したことにより、このフ
ロータ通過時に合金化のためのめっき層は未だ溶融もし
くは半溶融の状態であってもよいから、従来トップロー
ルの手前で合金化メツキ鋼帯を急冷しトップロール通過
時の温度を約３２０℃以下に下げていたがこの急冷の必
要は全くないので、フロータ通過時にもめっき鋼帯を継
続して加熱しておくことができる。又フロータ通過後の
方向転換部、例えば水平部にて、引続き加熱・均熱を続
行し合金化時間を充分取ることができる。なおフロータ
を高温ガスなどの高温気体を使用することによりフロー
タ通過中も合金化加熱を付与せしめることもできる。By installing a floater that can change the direction of the plated steel strip without contact in place of the conventional top roll, the plated layer for alloying may still be in a molten or semi-molten state when passing through the floater. Conventionally, the alloyed plated steel strip was rapidly cooled before the top roll to lower the temperature to approximately 320°C or less when passing through the top roll, but this rapid cooling is not necessary at all, so the plated steel strip continues to be coated when passing through the floater. You can heat it up. In addition, heating and soaking can be continued at a direction change section, for example, a horizontal section, after passing through the floater, so that sufficient alloying time can be obtained. Note that by using a high temperature gas such as a high temperature gas in the floater, alloying heating can be applied even while passing through the floater.
従来の合金化炉と同じライン速度で本発明の合金化装置
を操業するとすれば、上部の方向転換用のフロータ塩の
上りの区間で、従来の合金化炉に比ベア〜１０秒間合金
化加熱・均熱時間を長く取ることができ、更に、９０°
方向転換したのちの水平部の加熱・均熱室にて約２０秒
近く加熱・均熱を行うことができるので、合金化のため
の合計の加熱・均熱時間が２０秒＋（７〜１０秒〉＋２
０秒−４７〜５０秒と従来の２０秒に比して２倍以上も
合金化時間を長く取ることができる。Assuming that the alloying apparatus of the present invention is operated at the same line speed as a conventional alloying furnace, the alloying heating time in the upstream section of the floater salt for changing direction at the top will be approximately 10 seconds compared to the conventional alloying furnace.・You can take a long soaking time, and also 90°
After changing the direction, heating and soaking can be performed for approximately 20 seconds in the horizontal heating and soaking chamber, so the total heating and soaking time for alloying is 20 seconds + (7 to 10 seconds). seconds〉+2
The alloying time can be extended to 0 seconds - 47 to 50 seconds, which is more than twice as long as the conventional 20 seconds.
従って第３図の合金化時間−温度−パウダリング量の相
関々係から本発明の合金化装置では約５００℃で合金化
を行えばよいことになリパウダリング性が従来の５ ｍ
ｇから約３ ｍｇへと大巾に低減でき加工性を著しく改
善することができる。Therefore, from the correlation between alloying time, temperature, and amount of powdering shown in Fig. 3, it is sufficient to perform alloying at about 500°C in the alloying apparatus of the present invention.
It is possible to significantly reduce the weight from g to about 3 mg, and to significantly improve processability.
次に本願発明の一実施例を示す第１図により詳細に説明
する。Next, an embodiment of the present invention will be explained in detail with reference to FIG. 1.
第１図において１〜７は第２図に示した従来装置と同一
構成物を示す。即ち１は鋼帯、２は前処理炉で還元焼鈍
炉もしくは大気雰囲気炉が使用される。３は溶融亜鉛槽
、４はジンクロール、５はエアーナイフ、６は誘導加熱
装置、７はバーナ式加熱炉をそれぞれ示し、機能は従来
装置と同じである。In FIG. 1, numerals 1 to 7 indicate the same components as the conventional device shown in FIG. That is, 1 is a steel strip, 2 is a pretreatment furnace, and a reduction annealing furnace or an atmospheric atmosphere furnace is used. 3 is a molten zinc tank, 4 is a zinc roll, 5 is an air knife, 6 is an induction heating device, and 7 is a burner type heating furnace, all of which have the same functions as the conventional device.
２０はガスフロータで、従来のトップロールの位置相当
の高さに設けることにより、加熱炉７の炉長を長く採る
ことができる。即ち、ガスフロータ２０によりめっき鋼
帯を非接触状態で方向転換できるので、ガスフロータ２
０を通過する際のめっき鋼帯の表面のめっき層は加熱溶
融状態でも何ら支障はない。Reference numeral 20 denotes a gas floater, and by providing it at a height equivalent to the position of a conventional top roll, the length of the heating furnace 7 can be increased. That is, since the gas floater 20 can change the direction of the plated steel strip in a non-contact state, the gas floater 20
There is no problem with the plating layer on the surface of the plated steel strip when it passes through zero even if it is heated and molten.
２１は誘導加熱装置、２２はバーナ式の加熱装置であり
、それぞれめっき層の合金化のための加熱を施こすため
のものである。この水平部の追加加熱装置により合金化
時間を充分かせぐことができる。従って合金化温度を低
く抑えることができるので第３図に示した合金時間−温
度−パウダリング量の相関々係から合金層のパウダリン
グ性を抑えることができる。21 is an induction heating device, and 22 is a burner type heating device, each of which is used to heat the plating layer for alloying. This additional heating device in the horizontal section allows for sufficient alloying time. Therefore, since the alloying temperature can be kept low, the powdering property of the alloy layer can be suppressed from the correlation between alloying time, temperature, and amount of powdering shown in FIG.
２３は合金化加熱後に合金化めっき鋼帯をロールに接触
しても合金層が機械的に損われない程度の温度即ち、約
３２０℃以下に冷却するための急冷室であり、通常では
冷空気を吹付けて冷却する。２４はめっき鋼帯を下方に
方向転換するためのデフレクタ−ロール（トップロール
）である。このロール２４により下方に転じられた合金
化めっき鋼帯はさらに冷却されるためにガス冷却塔２５
及び水冷槽２６へと順次送られて常温まで冷却されて合
金化亜鉛めっき鋼帯となる。Reference numeral 23 denotes a quenching chamber for cooling the alloyed plated steel strip after alloying heating to a temperature below about 320°C that will not mechanically damage the alloy layer even if it comes into contact with a roll, and is normally heated with cold air. Cool by spraying. 24 is a deflector roll (top roll) for changing the direction of the plated steel strip downward. The alloyed plated steel strip rolled downward by the rolls 24 is sent to a gas cooling tower 25 for further cooling.
The steel strip is sequentially sent to a water cooling tank 26 and cooled to room temperature to become an alloyed galvanized steel strip.
なお、２７は電磁式のフロータでガスフロータ２０と併
用すればガスフロータ２０の動力を低減できる。また、
２８はダクトで、ガスフロータ２０の作動流体として高
温のガスを使う場合に設けると熱効率をアップができる
利点がある。この場合には、誘導加熱装置２１を省略し
てもよい。In addition, 27 is an electromagnetic type floater, and if used together with the gas floater 20, the power of the gas floater 20 can be reduced. Also,
A duct 28 has the advantage of increasing thermal efficiency when provided when high temperature gas is used as the working fluid of the gas floater 20. In this case, the induction heating device 21 may be omitted.
下表にめっき川原鋼帯として、低炭素鋼、アルミキルド
鋼及びチタンキルド鋼をそれぞれ使用した場合について
本発明実施例の効果を従来装置を使用した場合と比較し
て示す。The table below shows the effects of the present invention when low carbon steel, aluminum killed steel, and titanium killed steel are respectively used as the plated Kawahara steel strip, in comparison with the case where a conventional device is used.
めっき条件は、いずれの場合も同一としである。The plating conditions were the same in all cases.
この結果から判るように、いずれの鋼種（原鋼帯）につ
いても本発明装置では合金化時間を４０秒とすることが
できるので、合金化温度を低く抑えることができ、従っ
て製品のパウダリング量が約半分と著しく低減でき、合
金化めっき鋼板の加工性を大巾に高めることができる。As can be seen from these results, the apparatus of the present invention can reduce the alloying time to 40 seconds for any steel type (raw steel strip), so the alloying temperature can be kept low, and the powdering amount of the product can be reduced to 40 seconds. can be significantly reduced to about half, and the workability of alloyed plated steel sheets can be greatly improved.
本発明により溶融亜鉛めっきの合金化に際して比較的低
温かつ長時間の加熱処理が可能となり、製品のパウダリ
ングを大巾に低減でき、合金化亜鉛めっき鋼板の加工性
を高めることが可能となる。According to the present invention, heat treatment can be performed at a relatively low temperature and for a long time when hot-dip galvanized steel is alloyed, and powdering of the product can be significantly reduced, making it possible to improve the workability of alloyed galvanized steel sheets.
第１図は本発明の一実施例の溶融亜鉛めっきの合金化装
置の概略図、第２図は従来の溶融亜鉛めっき合金化装置
の一態様の概略図、第３図は亜鉛めっきの合金化時間−
温度−パウダリング量の相関々係を示す図表である。Fig. 1 is a schematic diagram of a hot-dip galvanizing alloying apparatus according to an embodiment of the present invention, Fig. 2 is a schematic diagram of an embodiment of a conventional hot-dip galvanizing alloying apparatus, and Fig. 3 is a schematic diagram of a galvanizing alloying apparatus according to an embodiment of the present invention. Time-
It is a chart showing the correlation between temperature and amount of powdering.
Claims (1)
れた鋼帯を加熱するための該溶融亜鉛槽の上方に設けら
れた垂直方向に延びた加熱炉、加熱された亜鉛めっき鋼
帯の進行方向を変えるための該加熱炉の上方に設けられ
たフロータ、方向転換された加熱亜鉛めっき鋼帯を更に
加熱する加熱炉、加熱亜鉛めっき鋼帯を冷却するための
該加熱炉に続いて設けられた急冷室、該急冷室に続いて
設けられたトップロール、該トップロールに続いて設け
られた冷却塔及び水冷槽よりなることを特徴とする溶融
亜鉛めっきの合金化装置。A hot-dip galvanizing bath for galvanizing steel strip, a vertically extending heating furnace installed above the hot-dip galvanizing bath for heating the galvanized steel strip, and advancement of the heated galvanized steel strip. A floater provided above the heating furnace for changing the direction, a heating furnace for further heating the heated galvanized steel strip that has been changed in direction, and a floater provided subsequent to the heating furnace for cooling the heated galvanized steel strip. 1. An alloying apparatus for hot-dip galvanizing, comprising: a quenching chamber, a top roll provided following the quenching chamber, a cooling tower and a water cooling tank provided following the top roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33873789A JP2617592B2 (en) | 1989-12-28 | 1989-12-28 | Hot dip galvanizing alloying equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33873789A JP2617592B2 (en) | 1989-12-28 | 1989-12-28 | Hot dip galvanizing alloying equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03199366A true JPH03199366A (en) | 1991-08-30 |
| JP2617592B2 JP2617592B2 (en) | 1997-06-04 |
Family
ID=18320987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33873789A Expired - Fee Related JP2617592B2 (en) | 1989-12-28 | 1989-12-28 | Hot dip galvanizing alloying equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2617592B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0559511A (en) * | 1991-05-30 | 1993-03-09 | Nippon Steel Corp | Galvanizing equipment for steel strip |
-
1989
- 1989-12-28 JP JP33873789A patent/JP2617592B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0559511A (en) * | 1991-05-30 | 1993-03-09 | Nippon Steel Corp | Galvanizing equipment for steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2617592B2 (en) | 1997-06-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |