JPH04154947A - Annealing furnace for galvanizng steel strip - Google Patents
Annealing furnace for galvanizng steel stripInfo
- Publication number
- JPH04154947A JPH04154947A JP27502790A JP27502790A JPH04154947A JP H04154947 A JPH04154947 A JP H04154947A JP 27502790 A JP27502790 A JP 27502790A JP 27502790 A JP27502790 A JP 27502790A JP H04154947 A JPH04154947 A JP H04154947A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- passed
- furnace
- induction heating
- zone
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000000137 annealing Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 75
- 230000006698 induction Effects 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000005238 degreasing Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 29
- 238000005246 galvanizing Methods 0.000 claims description 14
- 239000010731 rolling oil Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 abstract description 7
- 210000004894 snout Anatomy 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 3
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000010960 cold rolled steel Substances 0.000 abstract 1
- 239000000356 contaminant Substances 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 abstract 1
- 238000007747 plating Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005406 washing 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〕
この発明は鋼帯の亜鉛メッキに先立って鋼帯を連続焼鈍
する焼鈍炉に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an annealing furnace for continuously annealing a steel strip prior to galvanizing the steel strip.
（従来の技術）
従来のこの種の焼鈍炉としては、第２図に示す直火式無
酸化炉方式のものが多（用いられている。(Prior Art) As a conventional annealing furnace of this type, a direct-fired non-oxidizing furnace type shown in FIG. 2 is widely used.
図中、１は直火式無酸化加熱炉、２は加熱帯、３は冷却
帯で、ジェット式急速冷却帯４と過時効処理帯５とから
成る。また６はスナウトで、その先端部は、ビット炉７
内に貯留した溶融亜鉛８内に浸漬されている。In the figure, 1 is a direct-fired non-oxidizing heating furnace, 2 is a heating zone, and 3 is a cooling zone, which consists of a jet-type rapid cooling zone 4 and an overaging treatment zone 5. 6 is a snout, the tip of which is the bit furnace 7.
It is immersed in molten zinc 8 stored inside.
上記構成の焼鈍炉９においては、先ず直火式無酸化加熱
炉１においてＬＰＧ、ＣＯＧ、ＬＮＧ等のガスを空燃比
０．９〜０．９５程度で燃焼さぜ、鋼帯１０を無酸化状
態で加熱して３００〜７００℃の所定温度に鋼帯１０を
昇温させ、鋼帯表面に（＝ｊ着した圧延油を除去する。In the annealing furnace 9 having the above configuration, gas such as LPG, COG, LNG, etc. is first combusted in the direct-fired non-oxidizing heating furnace 1 at an air-fuel ratio of about 0.9 to 0.95, and the steel strip 10 is brought into a non-oxidizing state. The steel strip 10 is heated to a predetermined temperature of 300 to 700° C., and the rolling oil deposited on the surface of the steel strip is removed.
次いで加熱帯２においては、ラジアントチューブバーナ
あるいは電熱ヒータを熱源として、Ｎ２：１０〜２５％
、Ｎ２ ：９０〜７５％の還元性雰囲気ガス中で鋼帯１
０を所定の熱処理温度（たとえば６８０〜８５０℃）に
昇温させるとともに、微少量酸化した鋼帯表面を還元し
、以下ジェット式急速冷却帯４において所定の低温（た
とえば４５０℃）まで急速冷却し、過時効処理帯５にお
いてこの温度に保持後、スナウト６を経てピット炉７内
の溶融亜鉛８に浸漬して亜鉛メッキをおこなうものであ
る。Next, in heating zone 2, N2: 10 to 25% is heated using a radiant tube burner or an electric heater as a heat source.
, N2: Steel strip 1 in a reducing atmosphere gas of 90 to 75%
0 to a predetermined heat treatment temperature (for example, 680 to 850 °C), the surface of the steel strip that has been slightly oxidized is reduced, and then rapidly cooled to a predetermined low temperature (for example, 450 °C) in the jet rapid cooling zone 4. After being maintained at this temperature in the overaging treatment zone 5, it is immersed in molten zinc 8 in a pit furnace 7 through a snout 6 to perform galvanizing.
ところが上記構成の焼鈍炉９においては、直火式無酸化
加熱炉１において、鋼帯１０に付着した圧延油が完全に
除去できないことがあり、また直火バーナーによる輻射
および対流熱伝達による加熱のためか長が長く必要で、
この長い直火式無酸化加熱炉１通過中に直火バーナ火炎
の乱れ等により鋼帯表面に若干の酸化層を生じることが
ある。However, in the annealing furnace 9 configured as described above, in the direct-fired non-oxidation heating furnace 1, the rolling oil adhering to the steel strip 10 may not be completely removed, and the heating by radiation and convection heat transfer by the direct-fired burner may not be completely removed. I need a long sleeve,
While passing through this long direct-fired non-oxidizing heating furnace 1, a slight oxidation layer may be formed on the surface of the steel strip due to turbulence of the direct-fired burner flame.
このため後工程における亜鉛メッキの際の亜鉛メッキ合
金層の生成が局部的に不充分となり、亜鉛の密着性が劣
り高品質の亜鉛メッキには適さないという問題があった
。また直火式無酸化加熱炉１は炉の熱容量が大きく、鋼
帯の材種や加熱温度の変更等の焼鈍条件の変更時におけ
る設定炉温切換に時間がかかり、この切換中に長尺の熱
処理不良品が発生するため、小ロツト多品種の鋼帯の亜
鉛メッキ用焼鈍には不適当であるという問題をも有する
ものであった。For this reason, there was a problem that the formation of a galvanized alloy layer during galvanizing in the subsequent process was insufficient locally, resulting in poor zinc adhesion and being unsuitable for high-quality galvanizing. In addition, the direct-fired non-oxidizing heating furnace 1 has a large furnace heat capacity, and it takes time to change the set furnace temperature when changing annealing conditions such as changing the steel strip grade or heating temperature. This method also has the problem of being unsuitable for galvanizing annealing of a large variety of steel strips in small lots because defective products are produced during heat treatment.
この発明は上記従来の問題点を解決するもので、亜鉛の
密着性のすぐれた高品質の亜鉛メッキ製品の生産が可能
となり、小ロツト多品種の鋼帯の焼鈍に適した鋼帯亜鉛
メッキ用焼鈍炉を提供しようとするものである。This invention solves the above-mentioned conventional problems, and makes it possible to produce high-quality galvanized products with excellent zinc adhesion, and is suitable for galvanizing steel strips suitable for annealing a wide variety of steel strips in small lots. The purpose is to provide an annealing furnace.
しかしてこの発明の鋼帯亜鉛メッキ用焼鈍炉は、冷却帯
の入口側に連設され還元性雰囲気中で鋼帯の加熱をおこ
なう加熱帯の入口側に、雰囲気ガスシール装置を介して
誘導加熱炉を連設するとともに、この誘導加熱炉の入口
側に鋼帯の圧延油除去用の脱脂装置を設置したことを特
徴とする。However, in the annealing furnace for galvanizing steel strips of the present invention, induction heating is performed via an atmosphere gas sealing device on the inlet side of the heating zone, which is connected to the inlet side of the cooling zone and heats the steel strip in a reducing atmosphere. It is characterized in that the furnace is installed in series, and a degreasing device for removing rolling oil from the steel strip is installed on the inlet side of the induction heating furnace.
そして誘導加熱炉には、その入口部にも雰囲気ガスシー
ル装置を付設するとともに、不活性ガス乃至還元性ガス
から成る雰囲気ガスを供給する雰囲気ガス供給装置を接
続すると、誘導加熱炉出口部における鋼帯加熱温度が高
い場合でも確実に無酸化状態で鋼帯を加熱できるので、
好ましい。The induction heating furnace is also equipped with an atmospheric gas sealing device at its inlet, and an atmospheric gas supply device that supplies atmospheric gas consisting of an inert gas or reducing gas is connected to the induction heating furnace. Even when the strip heating temperature is high, the steel strip can be reliably heated in a non-oxidized state.
preferable.
この発明の鋼帯亜鉛メッキ用焼鈍炉においては、鋼帯に
付着した圧延油は脱脂装置において除去され、次いでこ
の鋼帯は、誘導加熱炉において誘導加熱され、所定の鋼
帯加熱温度に昇温しで加熱帯に送入され、還元性雰囲気
中で加熱されたのち冷却帯において所定の冷却処理を受
け、亜鉛メッキ処理部に供給される。In the annealing furnace for galvanizing steel strips of the present invention, rolling oil adhering to the steel strip is removed in a degreasing device, and then this steel strip is induction heated in an induction heating furnace to raise the temperature to a predetermined steel strip heating temperature. After that, it is fed into a heating zone, heated in a reducing atmosphere, subjected to a prescribed cooling treatment in a cooling zone, and then supplied to a galvanizing treatment section.
圧延油は脱脂装置により除去されているので、誘導加熱
炉においては加熱帯の加熱に先立って鋼帯を所定の温度
に加熱するだけでよく、また誘導加熱は急速加熱が可能
で鋼帯の誘導加熱炉内通過時間は短くて済み、誘導加熱
炉出口部における鋼帯加熱温度が３５０℃未満と低い場
合は、誘導加熱炉内を空気雰囲気としたままで、鋼帯加
熱温度が３５０〜７００℃の場合は雰囲気ガス供給装置
により誘導加熱炉内を不活性ガス雰囲気乃至還元性ガス
雰囲気とした状態で、鋼帯の誘導加熱をおこなえば、鋼
帯は無酸化状態で迅速に加熱される。Since the rolling oil is removed by a degreasing device, in an induction heating furnace, it is only necessary to heat the steel strip to a predetermined temperature before heating the heating zone. The time required for passing through the heating furnace is short, and if the steel strip heating temperature at the outlet of the induction heating furnace is low, less than 350°C, the steel strip heating temperature may be 350 to 700°C while leaving the induction heating furnace in an air atmosphere. In this case, if the steel strip is induction heated with an inert gas atmosphere or a reducing gas atmosphere inside the induction heating furnace using an atmospheric gas supply device, the steel strip will be rapidly heated in a non-oxidized state.
このため誘導加熱炉出口部における鋼帯には圧延油の残
存付着や酸化層の発生がないので、これに後工程の加熱
、冷却、亜鉛メッキを施せば、亜鉛の密着性がすぐれた
高品質の亜鉛メッキ製品が得られる。For this reason, the steel strip at the exit of the induction heating furnace has no residual rolling oil adhesion or oxidation layer, so if it is heated, cooled, and galvanized in the post-process, it will be a high-quality product with excellent zinc adhesion. galvanized products are obtained.
また誘導加熱は急速加熱が可能であるうえ材料自身の発
熱を利用するものであるので、焼鈍条件変更時には、炉
体の熱容量には無関係に鋼帯加熱温度の切換を迅速にお
こなうことができ、また表面の輻射率の低い鋼帯に対し
ても輻射加熱に比べて効率よく短時間で加熱ができる。In addition, induction heating is capable of rapid heating and utilizes the material's own heat generation, so when changing annealing conditions, the steel strip heating temperature can be quickly changed regardless of the heat capacity of the furnace body. Furthermore, steel strips with low surface emissivity can be heated more efficiently and in a shorter time than with radiation heating.
以下第１図によりこの発明の一実施例を説明する。図中
、１１は焼鈍炉で、１２は還元性雰囲気中で鋼帯１０の
加熱をおこなう加熱帯２の入口側に連設した誘導加熱炉
で、炉体１２ａ内に鋼帯１０のパスラインに近接して誘
導加熱ｊイル１３をそなえ、図示しないロール上を走行
する鋼帯１０を誘導加熱するものである。１４は誘導加
熱コイル１３に接続された高周波電源である。また１５
は加熱帯２と誘導加熱炉１２の間に設けた雰囲気ガスシ
ール装置、１６は誘導加熱炉１２の入口部に設けた雰囲
気ガスシール装置で、ロール式のものを図示しであるが
、地形式のものを用いてもよい。１７はＮ２ガスから成
る不活性ガスを供給する雰囲気ガス供給装置で、そのガ
ス供給口１７ａは誘導加熱炉１２に接続されている。ま
た１８は、誘導加熱炉１２の入口側に配設された脱脂装
置で、アルカリ洗浄液の吹付、ブラッシング、水洗、乾
燥をおこなう公知のアルカリ脱脂装置のほか、電解脱脂
装置等を用いることもできる。その他の構成は第２図の
従来の焼鈍炉と同じであるので、同一部分に同一符号を
付して、その詳しい説明は省略する。An embodiment of the present invention will be explained below with reference to FIG. In the figure, 11 is an annealing furnace, and 12 is an induction heating furnace connected to the inlet side of the heating zone 2 that heats the steel strip 10 in a reducing atmosphere. An induction heating coil 13 is provided nearby to induction heat the steel strip 10 running on a roll (not shown). 14 is a high frequency power source connected to the induction heating coil 13. Also 15
16 is an atmospheric gas sealing device installed between the heating zone 2 and the induction heating furnace 12, and 16 is an atmospheric gas sealing device installed at the entrance of the induction heating furnace 12. Although a roll type is shown in the figure, a ground type You may also use one. Reference numeral 17 denotes an atmospheric gas supply device for supplying an inert gas consisting of N2 gas, and its gas supply port 17a is connected to the induction heating furnace 12. Further, 18 is a degreasing device disposed on the inlet side of the induction heating furnace 12, and in addition to a known alkaline degreasing device that performs spraying of an alkaline cleaning solution, brushing, washing, and drying, an electrolytic degreasing device or the like can also be used. The rest of the structure is the same as the conventional annealing furnace shown in FIG. 2, so the same parts are given the same reference numerals and detailed explanation thereof will be omitted.
上記構成の焼鈍炉１１においては、鋼帯１０は先ず脱脂
装＠１８内を通過し、付着した圧延油を除去されたのち
、誘導加熱炉１２内において誘導加熱コイル１３により
誘導加熱され昇温する。誘導加熱炉１２の出口部におけ
る鋼帯加熱温度が３５０〜７００℃のときは、雰囲気ガ
ス供給装置１７により不活性ガスを誘導加熱炉１２内に
供給して不活性ガス雰囲気中で誘導加熱をおこない、鋼
帯１０の酸化を防止する。また上記鋼帯加熱温度が３５
０℃未満の場合は、空気雰囲気中で誘導加熱をおこなっ
ても、温度が低いのと加熱時間が短いため鋼帯１０の酸
化は生じない。In the annealing furnace 11 having the above configuration, the steel strip 10 first passes through a degreaser @ 18 to remove attached rolling oil, and then is induction heated by an induction heating coil 13 in an induction heating furnace 12 to raise its temperature. . When the steel strip heating temperature at the outlet of the induction heating furnace 12 is 350 to 700°C, an inert gas is supplied into the induction heating furnace 12 by the atmospheric gas supply device 17 to perform induction heating in an inert gas atmosphere. , preventing oxidation of the steel strip 10. In addition, the above steel strip heating temperature is 35
If the temperature is less than 0° C., oxidation of the steel strip 10 will not occur even if induction heating is performed in an air atmosphere because the temperature is low and the heating time is short.
このようにして脱脂され無酸化状態で所定の鋼帯加熱温
度まで昇温した鋼帯１０は、加熱帯２における還元性雰
囲気中での加熱、および冷却帯３における急速冷却およ
び低温（４５０℃）での保持による過時効処理を受けた
のち、清浄で酸化層のない状態でピット炉７において亜
鉛メッキされ、密着性のすぐれた亜鉛メッキ製品が得ら
れるのである。The steel strip 10, which has been degreased in this way and heated to a predetermined steel strip heating temperature in a non-oxidized state, is heated in a reducing atmosphere in the heating zone 2, rapidly cooled in the cooling zone 3, and heated to a low temperature (450°C). After being subjected to an over-aging treatment by holding at a temperature of 100 mL, the galvanized product is galvanized in a pit furnace 7 in a clean state without an oxidized layer, resulting in a galvanized product with excellent adhesion.
この発明は上記実施例に限定されるものではな（、たと
えば雰囲気ガス供給装置７７は、Ｈ２十Ｎ２ガス等の還
元性ガスを雰囲気ガスとして誘導加熱炉１２に供給する
ものとしてもよい。また誘導加熱炉１２の出口部におけ
る鋼帯加熱温度が常に３５０℃未満の焼鈍をおこなう炉
の場合は、雰囲気ガス供給装置１７および入口部の雰囲
気ガスシール装置１６は省略してもよい。また冷却帯３
の構成は上記実施例以外のものとしてもよい。The present invention is not limited to the above embodiments (for example, the atmospheric gas supply device 77 may supply a reducing gas such as H20N2 gas to the induction heating furnace 12 as the atmospheric gas. In the case of an annealing furnace in which the steel strip heating temperature at the outlet of the heating furnace 12 is always less than 350°C, the atmospheric gas supply device 17 and the atmospheric gas sealing device 16 at the inlet may be omitted.
The configuration may be other than the above embodiment.
以上説明したようにこの発明によれば、鋼帯は脱脂装置
により圧延油を除去され、誘導加熱炉において誘導加熱
により短時間で所定の鋼帯加熱温度迄昇温し、圧延油の
残存付着や酸化層のない状態で加熱帯に供給されるので
、焼鈍後に亜鉛メッキを施せば亜鉛の密着性のすぐれた
高品質の亜鉛メッキ製品が得られる。また焼鈍条件変更
時には誘導加熱炉における鋼帯加熱温度の切換を迅速に
おこなうことができ、小ロツト多品種の鋼帯の亜鉛メッ
キ用焼鈍に最適の焼鈍炉が提供される。As explained above, according to the present invention, the rolling oil is removed from the steel strip by a degreasing device, and the temperature is raised to a predetermined steel strip heating temperature in a short time by induction heating in an induction heating furnace, thereby eliminating residual adhesion of rolling oil. Since it is supplied to the heating zone without an oxidized layer, if galvanized after annealing, a high quality galvanized product with excellent zinc adhesion can be obtained. Further, when changing annealing conditions, the heating temperature of the steel strip in the induction heating furnace can be quickly changed, thereby providing an annealing furnace that is optimal for galvanizing annealing of a large variety of steel strips in small lots.
第１図はこの発明の一実施例を示す鋼帯亜鉛メッキ装置
の全体構成図、第２図は従来の鋼帯亜鉛メッキ装置の全
体構成図である。
２・・・加熱帯、３・・・冷却帯、１０・・・鋼帯、１
１・・・焼鈍炉、１２・・・誘導加熱炉、１３・・・誘
導加熱コイル、１４・・・高周波電源、１５・・・雰囲
気ガスシール装置、１６・・・雰囲気ガスシール装置、
１７・・・雲間気ガス供給装置、１８・・・脱脂装置。FIG. 1 is an overall configuration diagram of a steel strip galvanizing apparatus showing an embodiment of the present invention, and FIG. 2 is an overall configuration diagram of a conventional steel strip galvanizing apparatus. 2... Heating zone, 3... Cooling zone, 10... Steel strip, 1
DESCRIPTION OF SYMBOLS 1... Annealing furnace, 12... Induction heating furnace, 13... Induction heating coil, 14... High frequency power supply, 15... Atmosphere gas seal device, 16... Atmosphere gas seal device,
17... Intercloud gas supply device, 18... Degreasing device.
Claims (2)
加熱をおこなう加熱帯の入口側に、雰囲気ガスシール装
置を介して誘導加熱炉を連設するとともに、この誘導加
熱炉の入口側に鋼帯の圧延油除去用の脱脂装置を設置し
たことを特徴とする鋼帯亜鉛メッキ用焼鈍炉。1. An induction heating furnace is connected to the inlet side of the heating zone, which is connected to the inlet side of the cooling zone and heats the steel strip in a reducing atmosphere, via an atmosphere gas sealing device. An annealing furnace for galvanizing steel strips, characterized in that a degreasing device for removing rolling oil from the steel strips is installed.
設され、不活性ガス乃至還元性ガスから成る雰囲気ガス
を供給する雰囲気ガス供給装置を、前記誘導加熱炉に接
続した請求項１記載の鋼帯亜鉛メッキ用焼鈍炉。2. The steel strip according to claim 1, wherein an atmospheric gas sealing device is also provided at the entrance of the induction heating furnace, and an atmospheric gas supply device for supplying an atmospheric gas consisting of an inert gas or a reducing gas is connected to the induction heating furnace. Annealing furnace for galvanizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27502790A JPH04154947A (en) | 1990-10-12 | 1990-10-12 | Annealing furnace for galvanizng steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27502790A JPH04154947A (en) | 1990-10-12 | 1990-10-12 | Annealing furnace for galvanizng steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04154947A true JPH04154947A (en) | 1992-05-27 |
Family
ID=17549857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27502790A Pending JPH04154947A (en) | 1990-10-12 | 1990-10-12 | Annealing furnace for galvanizng steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04154947A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964643A (en) * | 2017-12-27 | 2018-04-27 | 安德里茨（中国）有限公司 | Hot-strip continuous hot galvanizing device and method |
-
1990
- 1990-10-12 JP JP27502790A patent/JPH04154947A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964643A (en) * | 2017-12-27 | 2018-04-27 | 安德里茨（中国）有限公司 | Hot-strip continuous hot galvanizing device and method |
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