JPH0629457B2 - Heat treatment method for cold rolled stainless steel strip - Google Patents
Heat treatment method for cold rolled stainless steel stripInfo
- Publication number
- JPH0629457B2 JPH0629457B2 JP62273453A JP27345387A JPH0629457B2 JP H0629457 B2 JPH0629457 B2 JP H0629457B2 JP 62273453 A JP62273453 A JP 62273453A JP 27345387 A JP27345387 A JP 27345387A JP H0629457 B2 JPH0629457 B2 JP H0629457B2
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- stainless steel
- soot
- heat treatment
- temperature
- 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.)
- Expired - Lifetime
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ステンレス冷延鋼帯を主として輻射熱により
所定温度に加熱して行う焼鈍など熱処理において、熱処
理炉で輻射熱の吸収効率良く加熱することのできるステ
ンレス冷延鋼帯の熱処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to heat a cold-rolled stainless steel strip to a predetermined temperature mainly by radiant heat in a heat treatment furnace, such as annealing, with good absorption efficiency of radiant heat. The present invention relates to a heat treatment method for cold-rolled stainless steel strip that can be used.
〔従来の技術〕 一般にステンレス冷延鋼帯の製造工程においては、冷間
圧延によつて起こる加工硬化による加工歪などを除去す
るために焼鈍工程が酸洗工程を伴つて組み込まれてお
り、かかる焼鈍には一般に大気開放状態で横型のカテナ
リー炉に代表される連続式熱処理炉が広く使用されてい
る。[Prior Art] Generally, in a manufacturing process of a stainless cold-rolled steel strip, an annealing process is incorporated together with a pickling process in order to remove a processing strain due to work hardening caused by cold rolling. For annealing, generally, a continuous heat treatment furnace represented by a horizontal catenary furnace in an open atmosphere is widely used.
このような連続式熱処理炉は、安価な天然ガス，軽油，
重油等をバーナで燃焼させ、加熱された炉壁，バーナフ
レーム更には高温の燃焼ガス自体からそれぞれ発生する
輻射熱が主となつて鋼帯を加熱し熱処理するものであ
る。Such a continuous heat treatment furnace can be used for inexpensive natural gas, light oil,
Radiant heat generated by burning heavy oil and the like in a burner and heating the furnace wall, burner flame, and high-temperature combustion gas itself mainly heats and heats the steel strip.
このような連続式熱処理炉において、ステンレス冷延鋼
帯（以下、ステンレス鋼帯と略記することがある）は、
その良好な表面光沢のために熱線を反射するので輻射熱
の吸収効率が小さく、昇温に時間がかかつて熱処理炉の
熱処理能力が低い。そこでステンレス鋼帯に対する熱処
理能力を向上させるための種々な技術が提案されてき
た。In such a continuous heat treatment furnace, the stainless cold-rolled steel strip (hereinafter sometimes abbreviated as stainless steel strip) is
Because of its good surface gloss, it reflects heat rays, so the efficiency of absorption of radiant heat is small, and the heat treatment capacity of the heat treatment furnace is low as the temperature rises slowly. Therefore, various techniques have been proposed for improving the heat treatment ability of the stainless steel strip.
例えば、鋼帯を予熱するための予熱部分（予熱帯）を設
ける技術として、廃ガスのみで鋼帯を加熱できる予熱帯
域を設けた鋼帯連続焼鈍炉（特公昭52−26723号）、予
熱帯域として対流予熱帯と放射型予熱帯とを設けた直火
式連続熱処理炉（特公昭54−42804号）、加熱帯入側か
ら均熱帯出側までの間に誘導加熱炉を配した鋼帯連続加
熱方式（特開昭60−2634号）等が知られている。その他
に、炉長を長くしてそれだけ通板速度を速めることも知
られている。For example, as a technology to provide a preheating part (pretropical zone) for preheating a steel strip, a steel strip continuous annealing furnace (Japanese Patent Publication No. 52-26723) that has a preheating zone that can heat the steel strip only with waste gas, preheating zone Direct-fire continuous heat treatment furnace (Japanese Patent Publication No. 54-42804) with convection preheating zone and radial preheating zone, continuous steel strip with induction heating furnace between heating zone entrance side and soaking zone exit side A heating method (Japanese Patent Laid-Open No. 60-2634) and the like are known. In addition, it is also known to lengthen the furnace length and increase the plate passing speed accordingly.
また、熱処理炉の炉内雰囲気温度を可及的に高くする方
法も考えられるが、ステンレス鋼帯の焼鈍では熱処理温
度が750℃〜1100℃と可成り高いため、炉壁の耐熱温度
に素材から来る制約（通常1300℃程度まで）があつてそ
れ程の成果は得られない。A method of increasing the furnace atmosphere temperature of the heat treatment furnace as much as possible is possible, but the annealing temperature of the stainless steel strip is considerably high at 750 ℃ to 1100 ℃. Due to the coming restrictions (usually up to about 1300 ℃), such results cannot be obtained.
これらの従来技術における廃ガスによる予熱や誘導加熱
は、ステンレス鋼帯の加熱全体に消費される熱量の一部
を通常燃料以外のものでまかなつたことになるにすぎ
ず、炉長を長くする技術も含めて加熱ゾーンにおけるス
テンレス鋼帯への輻射熱の吸収効率の向上には直接寄与
していない欠点があつた。The preheating and induction heating by the waste gas in these conventional technologies merely means that a part of the heat amount consumed in the entire heating of the stainless steel strip is covered by something other than the normal fuel, which lengthens the furnace length. Including the technology, there was a drawback that it did not directly contribute to the improvement of the absorption efficiency of radiant heat to the stainless steel strip in the heating zone.
輻射熱の吸収効率の向上に寄与する従来技術としては、
本発明者らの一部がなした先の発明、すなわち加熱炉に
導入される前の鋼帯を酸素富化雰囲気に維持した誘導加
熱炉に通板して鋼帯表面に黒色の酸化スケール層を強制
的に形成させる方法（特開昭61−257430号）がある。こ
の方法は輻射熱の吸収効率を可成りの程度に向上させる
が必ずしも充分ではなく高価な電力を使用するので不経
済でもあり、その上、装置としても簡単でない欠点があ
つた。As a conventional technology that contributes to the improvement of radiant heat absorption efficiency,
A previous invention made by a part of the present inventors, that is, a steel sheet before being introduced into a heating furnace is passed through an induction heating furnace that maintains an oxygen-enriched atmosphere, and a black oxide scale layer is formed on the surface of the steel belt. Is forcibly formed (Japanese Patent Laid-Open No. 61-257430). This method improves the absorption efficiency of radiant heat to a considerable degree, but it is not always sufficient and uses expensive electric power, so that it is uneconomical and has a drawback that it is not simple as an apparatus.
また、表面光沢の良好なステンレス鋼帯の輻射熱吸収効
率を上げるためにステンレス鋼帯表面に炭素，黒色染
料，黒色顔料の単独物又はこれらの混合物を塗布する方
法（特公昭56−8092号）も提案されているが、この方法
は熱処理炉内に新たなこれらの塗布物を持ち込むので不
経済な側面を有し、且つステンレス鋼帯表面にこれらの
塗布物との化合物を精製させるために製品品質に悪い影
響を及ぼすという欠点があつた。Also, in order to increase the radiant heat absorption efficiency of the stainless steel strip having a good surface gloss, a method of applying carbon, a black dye, a black pigment alone or a mixture thereof to the surface of the stainless steel strip (Japanese Patent Publication No. 56-8092). Although proposed, this method has an uneconomical aspect because it brings new coatings into the heat treatment furnace, and the product quality for refining the compound with these coatings on the stainless steel strip surface. There was a drawback that it adversely affected the.
本発明は、前記従来技術のような欠点のないステンレス
冷延鋼帯の熱処理方法の提供を目的とする。この目的を
達成するために、如何にして簡単な方法でステンレス鋼
帯の表面を高い輻射熱吸収効率を有するように且つステ
ンレス鋼帯表面に悪い影響を残さないように構成するか
について解決困難な問題点があつた。It is an object of the present invention to provide a heat treatment method for a cold rolled stainless steel strip which does not have the drawbacks of the prior art. In order to achieve this purpose, it is difficult to solve how to configure the surface of the stainless steel strip to have a high radiant heat absorption efficiency in a simple manner and not to leave a bad influence on the surface of the stainless steel strip. There was a point.
本発明者らは上記問題点を解決すべく鋭意研究の結果、
主として輻射熱により加熱する横型の熱処理炉の輻射熱
加熱ゾーンより炉内外を問わず上流側で完全黒体に近い
物質として炭化水素ガスを不完全燃焼させたバーナの輝
炎により煤をステンレス鋼帯に付着させるようにすれ
ば、その輻射熱の吸収効率が著しく向上すると共にステ
ンレス鋼帯表面に悪い影響を残さないこと、取り分けこ
の横型の熱処理炉の炉外で上流側に隣設されている横型
の煤付着装置内において煤をステンレス鋼帯に付着させ
るようにすれば、煤を均一に安定して付着させることが
できるようになるばかりか僅かではあるがステンレス鋼
帯の予熱効果も生じて熱処理炉内における輻射熱の吸収
効率を一層向上させ得ることを究明して本発明を完成し
た。As a result of earnest research to solve the above problems, the present inventors have
Soot is adhered to the stainless steel strip by the burning flame of the burner incompletely combusting the hydrocarbon gas as a substance close to a perfect black body on the upstream side inside and outside the radiant heat heating zone of the horizontal type heat treatment furnace which is mainly heated by radiant heat By doing so, the efficiency of absorption of radiant heat is significantly improved and no adverse effect is left on the surface of the stainless steel strip. In particular, horizontal soot adhesion adjacent to the upstream side outside this horizontal heat treatment furnace If soot is made to adhere to the stainless steel strip in the equipment, not only will it be possible to deposit soot uniformly and stably, but also a slight amount of preheating effect of the stainless steel strip will occur and The present invention has been completed by investigating that the efficiency of absorbing radiant heat can be further improved.
すなわち本発明は、主として輻射熱により加熱する熱処
理炉にステンレス冷延鋼帯を通板して所定温度に加熱す
るに際し、横型の熱処理炉の炉外で上流側に隣設されて
いる横型の煤付着装置内で炭化水素ガスを不完全燃焼さ
せたバーナの輝炎によりステンレス冷延鋼帯に煤を付着
させた後に、前記横型の熱処理炉で加熱することを特徴
とするステンレス冷延鋼帯の熱処理方法に関するもので
ある。That is, the present invention, when the stainless cold-rolled steel strip is passed through a heat treatment furnace that is heated mainly by radiant heat and heated to a predetermined temperature, the horizontal soot adhesion adjacent to the upstream side outside the horizontal heat treatment furnace Heat treatment of the stainless cold-rolled steel strip characterized by heating soot in the cold-rolled stainless steel strip by a bright flame of a burner incompletely burning hydrocarbon gas in the apparatus, and then heating in the horizontal heat treatment furnace It is about the method.
以下に本発明方法を図面により詳細に説明する。第１図
は本発明方法の実施に好適な横型の煤付着装置を有する
連続熱処理装置の１例の配置系統図、第２図はオーステ
ナイト系ステンレス冷延鋼帯そのままと煤を付着したも
のとを大気中で各種温度に加熱した後の熱吸収率と鋼帯
温度の関係を示す比較図、第３図は煤を付着したオース
テナイト系ステンレス冷延鋼帯を各種温度に加熱した後
の鋼帯温度と煤の付着率との関係図である。Hereinafter, the method of the present invention will be described in detail with reference to the drawings. FIG. 1 is a layout diagram of an example of a continuous heat treatment apparatus having a horizontal soot depositing device suitable for carrying out the method of the present invention, and FIG. 2 shows an austenitic stainless cold-rolled steel strip as it is and a soot-deposited product. A comparative diagram showing the relationship between the heat absorption coefficient and the strip temperature after heating to various temperatures in the atmosphere, and Fig. 3 shows the strip temperature after heating the soot-adhered austenitic stainless cold-rolled strip to various temperatures. FIG. 3 is a relational diagram between the soot deposition rate and the soot deposition rate.
本発明の最も特徴とするところは、主として輻射熱によ
り加熱する横型の熱処理炉の炉外であつて且つ上流側に
隣設されている横型の煤付着装置内でステンレス鋼帯に
炭化水素ガスを不完全燃焼させたバーナの輝炎により煤
を付着させることにより、熱処理炉内では実質的に得ら
れない好適な条件の下でステンレス鋼帯表面に安定して
均一でより多量な煤を強制的に付着させることを可能と
し、従つて引き続く熱処理炉内においてステンレス鋼帯
表面に付着している煤の気化状態を極力抑制し遅らせる
ことができるようになり加熱ゾーンでの輻射熱の吸収効
率を良くして昇温速度を速め通板速度を大きくした点、
そして所定の温度に加熱される間にステンレス鋼帯表面
に付着している煤が完全に気化されてしまい熱処理の終
えたステンレス鋼帯表面に何ら悪い影響を残さない点に
ある。The most characteristic feature of the present invention is that the hydrocarbon gas is not adsorbed on the stainless steel strip inside the horizontal soot adhering device that is located outside the horizontal heat treatment furnace that is heated mainly by radiant heat and is adjacent to the upstream side. By adhering soot by the bright flame of the burner burned completely, it is possible to force a stable and uniform amount of soot on the surface of the stainless steel strip under suitable conditions that cannot be obtained in the heat treatment furnace. As a result, the vaporization state of soot adhering to the surface of the stainless steel strip in the subsequent heat treatment furnace can be suppressed and delayed as much as possible, and the absorption efficiency of radiant heat in the heating zone can be improved. The point that the temperature rising speed is increased and the strip passing speed is increased,
The soot adhering to the surface of the stainless steel strip is completely vaporized while being heated to a predetermined temperature, and there is no adverse effect on the surface of the stainless steel strip after the heat treatment.
第１図により説明すると、ステンレス鋼帯１は上流から
矢印方向に走行して来て内部に主として輻射熱により加
熱する輻射熱加熱ゾーンを有する横型の熱処理炉２に通
板される。このとき煤をステンレス鋼帯１の上下表面に
付着させる位置は、熱処理炉２の上流側の炉外、すなわ
ち図示する如くこの熱処理炉２の入口2aの炉外に隣設さ
れている煤付着装置３内であるので、熱処理炉２内にお
けるような悪影響を受けずよ好適な条件の下で煤を付着
させることができるし、この煤付着装置３内での煤付着
時にステンレス鋼帯１の温度が僅かではあるが上昇して
予熱効果が生じるので引き続いて行われるステンレス鋼
帯１の加熱時において輻射熱をより良く吸収し得て吸収
効率を高めることができるので好ましいのである。この
ように熱処理炉２の炉外で上流側に隣設されている横型
の煤付着装置３内で煤をステンレス鋼帯１の上下表面に
付着させるには、この煤付着装置３内を通板しているス
テンレス鋼帯１の上下表面近くにそれぞれ配置されたバ
ーナによつて、炭化水素ガス、殊にカーボン含有率が高
く且つ燃焼性の良好な炭化水素ガスを空気比（炭化水素
ガス１に対する空気量）0.01〜１で不完全燃焼させたバ
ーナの輝炎によりステンレス鋼帯１に煤を付着させるの
である。この際、好ましくはこの煤付着装置３の出側で
煤のステンレス鋼帯１への付着率（ステンレス鋼帯１の
単位面積に対する煤の付着された面積の比率）又はその
黒色度を例えば光沢計などで検出し、これをバーナ燃焼
条件やステンレス鋼帯１の通板速度にフイードバツクし
て制御することもできる。Referring to FIG. 1, the stainless steel strip 1 travels from the upstream in the direction of the arrow and is passed through a horizontal heat treatment furnace 2 having a radiant heat heating zone for heating mainly by radiant heat inside. At this time, the position where the soot is deposited on the upper and lower surfaces of the stainless steel strip 1 is located outside the furnace upstream of the heat treatment furnace 2, that is, as shown in the figure, adjacent to the outside of the furnace at the inlet 2a of the heat treatment furnace 2. Since it is inside 3, the soot can be attached under suitable conditions without being adversely affected as in the heat treatment furnace 2, and the temperature of the stainless steel strip 1 at the time of soot attachment in the soot attaching device 3 However, it is preferable that the radiant heat can be better absorbed during the subsequent heating of the stainless steel strip 1 and the absorption efficiency can be improved, since the temperature rises slightly but causes a preheating effect. As described above, in order to adhere the soot to the upper and lower surfaces of the stainless steel strip 1 in the horizontal soot adhering device 3 adjacent to the upstream side outside the furnace of the heat treatment furnace 2, the soot adhering device 3 is provided with a strip plate. By the burners respectively arranged near the upper and lower surfaces of the stainless steel strip 1, the hydrocarbon gas, in particular the hydrocarbon gas having a high carbon content and good combustibility, is transferred to the air ratio (to the hydrocarbon gas 1). The soot is adhered to the stainless steel strip 1 by the bright flame of the burner which is incompletely burned at an air amount of 0.01 to 1. At this time, it is preferable that the soot adhering rate of the soot on the stainless steel strip 1 (the ratio of the area where the soot is attached to the unit area of the stainless steel strip 1) or its blackness on the exit side of the soot adhering device 3 is measured by, for example, a gloss meter. It is also possible to control the temperature by detecting it with a burner combustion condition or the strip running speed of the stainless steel strip 1 and the like.
以上に説明したように煤の付着層が形成されたステンレ
ス鋼帯１は、煤付着装置３を出た後にその下流側の主と
して輻射熱により加熱する熱処理炉２の輻射熱加熱ゾー
ンを通過する間に、この煤の付着層が形成されているた
めにこの層を通して輻射熱をより良く吸収して昇温速度
を速めながら、鋼帯温度で普通750℃から1100℃までの
温度範囲内の所定温度に加熱されて焼鈍など熱処理が行
われるのである。As described above, the stainless steel strip 1 on which the soot adhesion layer is formed passes through the radiant heat heating zone of the heat treatment furnace 2 which is heated mainly by radiant heat on the downstream side after exiting the soot adhering device 3, Since this soot adhesion layer is formed, it better absorbs radiant heat through this layer and accelerates the rate of temperature rise, while it is heated to a predetermined temperature within the temperature range of normally 750 ° C to 1100 ° C at steel strip temperature. Heat treatment such as annealing is performed.
一般に主として輻射熱により加熱が行われる熱処理炉に
おいては、例えば被熱処理物としての鋼帯が吸収する輻
射熱量は、その表面放射率ε（熱吸収率とも呼ばれる）
及び炉内温度（Ｔ1）と鋼帯温度（Ｔ2）との差（Ｔ1−
Ｔ2）に大きく影響されることは、ステフアンボルツマ
ンの法則から知られている。ところでステンレス鋼や普
通鋼の冷延鋼帯の熱吸収率εは通常0.2〜0.4程度であつ
て比較的小さく、またステンレス鋼に必要な高温熱処理
条件と炉構築染材上の制限とから（Ｔ1−Ｔ2）に大きく
とれない。ここで本発明方法によれば、ステンレス鋼帯
１が未だ昇温していない常温状態においては煤付着装置
３により煤（カーボンの微粒子）をステンレス鋼帯１に
付着させてその表面に煤の付着層を形成することが容易
に行えて、しかもこの煤（カーボンの微粒子）の熱吸収
率εが完全黒体のそれ（ε＝１）い近い0.95であること
から、この煤の付着層の形成された状態にあるステンレ
ス鋼帯１の熱吸収率、換言すれば輻射熱の吸収効率を従
来低かつた低温域から高温域に向けて格段に次第に高め
ていくことができて、所定温度までに要する昇温時間を
大幅に短縮することができるのである。この際、ステン
レス鋼帯１は煤付着装置３により煤を付着される際に僅
かではあるが昇温されているので、上記高熱吸収率と相
まつてステンレス鋼帯１の昇温速度を非常に速めること
ができるようになり、従つて炉内の通板速度を大きく採
ることもできるのでその熱処理能力を大幅に向上させる
ことができると共に熱処理に必要な炉長を大幅に短くさ
せることができるのである。Generally, in a heat treatment furnace where heating is mainly performed by radiant heat, for example, the amount of radiant heat absorbed by a steel strip as an object to be heat treated is its surface emissivity ε (also called heat absorption rate).
And the difference (T 1 −) between the furnace temperature (T 1 ) and the steel strip temperature (T 2 ).
It is known from Stephan Boltzmann's law that it is greatly affected by T 2 ). By the way, the heat absorption coefficient ε of the cold-rolled steel strip of stainless steel or ordinary steel is usually about 0.2 to 0.4, which is relatively small, and because of the high-temperature heat treatment conditions required for stainless steel and the restrictions on the furnace construction dyeing material (T 1- T 2 ) cannot be obtained. Here, according to the method of the present invention, soot (fine particles of carbon) is attached to the stainless steel strip 1 by the soot attaching device 3 and the soot is attached to the surface of the stainless steel strip 1 at room temperature where the temperature has not yet risen. A layer can be easily formed, and the heat absorption coefficient ε of this soot (fine particles of carbon) is 0.95, which is close to that of a perfect black body (ε = 1). The heat absorption rate of the stainless steel strip 1 in the conditioned state, in other words, the absorption efficiency of radiant heat can be gradually increased from the low temperature range, which was conventionally low, to the high temperature range, and it is required until the predetermined temperature. The temperature raising time can be greatly shortened. At this time, the temperature of the stainless steel strip 1 is slightly increased when the soot is attached by the soot attaching device 3, so that the rate of temperature rise of the stainless steel strip 1 is extremely increased in combination with the high heat absorption rate. As a result, since it is possible to increase the strip running speed in the furnace, it is possible to greatly improve the heat treatment capacity and to shorten the furnace length required for heat treatment significantly. .
このようなことは第２図により裏付けされる。第２図は
オーステナイト系ステンレス鋼冷延鋼帯をそのまま（煤
の付着なし）か又は煤の付着層を形成をしてから大気雰
囲気中で各種温度に加熱した後、その熱吸収率εを測定
してそれと鋼帯温度との関係を示したものである。煤の
付着なしの場合（従来の熱処理方法におけるステンレス
鋼帯の状態は、鋼帯温度の低温側において熱吸収率εが
低い値となつているのに対し、煤の付着層の形成されて
いる場合は鋼帯温度の高低にかかわらず熱吸収率εは高
い値を示している。この結果、煤の付着層の形成されて
いるステンレス鋼帯は、熱処理炉の入口から炉内へ通板
されると同時に煤の付着なしの場合の（1.4から最高）
約２倍以上の熱量を受熱する。従つて、ステンレス鋼帯
を所定温度にまで加熱するのに最高約半分の時間で済む
から、従来の炉長を保てば通板速度を最高約２倍に高め
て熱処理能力を増大させることができて、また炉長を従
来の最高約半分に短縮して設備費の削減を図ることがで
きるのである。This is supported by FIG. Figure 2 shows the heat absorption coefficient ε of austenitic stainless steel cold-rolled steel strip as it is (no soot adhesion) or after forming a soot adhesion layer and heating it at various temperatures in the atmosphere. Then, the relationship between it and the temperature of the steel strip is shown. In case of no soot adhesion (The state of the stainless steel strip in the conventional heat treatment method has a low heat absorption coefficient ε on the low temperature side of the steel strip temperature, whereas the soot adhesion layer is formed. In this case, the heat absorption coefficient ε shows a high value regardless of whether the temperature of the steel strip is high or low, and as a result, the stainless steel strip on which the soot adhesion layer is formed is passed from the inlet of the heat treatment furnace into the furnace. And at the same time without soot adhesion (max from 1.4)
It receives about twice the amount of heat. Therefore, it takes up to about half the time to heat the stainless steel strip to the specified temperature. Therefore, if the conventional furnace length is maintained, the strip running speed can be increased up to about twice and the heat treatment capacity can be increased. In addition, the furnace length can be shortened to about half that of the conventional one, and the equipment cost can be reduced.
一方、ステンレス鋼帯に付着された煤はカーボンの微粒
子が主体であり固体状態を呈している。そして、炉内の
輻射熱加熱ゾーンを通板中にステンレス鋼帯の表面に付
着していた煤も鋼帯昇温に従つて炉内で気化（ＣＯ2と
なる）してステンレス鋼帯の表面から消散する。従つ
て、輻射熱加熱ゾーン通板後のステンレス鋼帯表面には
煤は既に完全に気化してしまつて付着しておらず、ステ
ンレス鋼帯表面への浸炭とか生成された化合物を残して
しまうといつた鋼帯品質面での悪影響は全くない。ま
た、前記煤の付着は、熱処理炉の炉外で上流側に隣設さ
れた横型の煤付着装置内で行われるので、ステンレス鋼
帯が未だ加熱されておらず常温状態にあり、バーナによ
り不完全燃焼させて積極的に発生させた煤を強制的に付
着させて行うため、ステンレス鋼帯表面に残存している
油類や摩耗粉などの付着物も煤の付着層中に取り込むこ
とができ、煤が気化しその消散と共に付着物を容易に剥
離し易くなつて、その後の工程で脱スケール処理した際
に表面品質の良好な製品を得ることができ、品質向上の
点からも有益である。また煤のステンレス鋼帯への付着
率は、第３図に示す如く鋼帯温度が700℃〜800℃いなる
と急激に低下する。On the other hand, the soot attached to the stainless steel strip is mainly composed of fine particles of carbon and is in a solid state. The soot that had adhered to the surface of the stainless steel strip in the radiant heat heating zone in the furnace was vaporized (converted to CO 2 ) in the furnace according to the temperature rise of the steel strip, and was removed from the surface of the stainless steel strip. Dissipate. Therefore, soot is already completely vaporized and not attached to the surface of the stainless steel strip after passing through the radiant heat heating zone, and when carburizing the stainless steel strip surface or leaving the generated compound. There is no adverse effect on the quality of the steel strip. Further, since the soot is adhered in a horizontal soot adhering device adjacent to the upstream side outside the furnace of the heat treatment furnace, the stainless steel strip has not been heated yet and is in a normal temperature state, and is not burned by the burner. Since the soot that is completely burned and positively generated is forcibly adhered, deposits such as oils and abrasion powder remaining on the surface of the stainless steel strip can be incorporated into the soot deposit layer. , Soot evaporates and its deposits are easily peeled off along with its dissipation, and a product with good surface quality can be obtained when descaling is performed in the subsequent step, which is also beneficial from the viewpoint of quality improvement. . Further, the adhesion rate of soot to the stainless steel strip sharply decreases when the steel strip temperature rises from 700 ° C to 800 ° C as shown in Fig. 3.
第３図は煤の付着率100％に煤の付着層が形成されたス
テンレス鋼帯を各種温度に加熱した後の加熱温度と煤の
付着率との関係を示すものである。このような関係か
ら、熱処理炉内にあつて、その上流側の低温域において
充分加熱されておらずステンレス鋼帯の温度が未だ低く
て鋼帯自体の熱吸収率εが本来低い領域においてはこの
ステンレス鋼帯の煤の付着率をほぼ100％のまま高く持
続することができるのでその熱吸収率εを高位安定して
保持できるのであるが、ステンレス鋼帯が輻射熱加熱ゾ
ーンで加熱されて次第に昇温していき、鋼帯温度が700
〜800℃に達すると、このステンレス鋼帯表面に付着し
ている煤が急激に気化してしまいステンレス鋼帯の煤の
付着率が激減するので必然的にステンレス鋼帯の熱吸収
率εも激減し、ステンレス鋼帯の輻射熱の吸収が大幅に
低下することが判る。しかしこのような高温領域ではス
テンレス鋼帯表面の酸化が進行して消散した煤の代わり
に酸化スケールが生成されるため、第２図に示す如くス
テンレス鋼帯の熱吸収率εは大きく低下しないのであ
る。FIG. 3 shows the relationship between the heating temperature and the soot deposition rate after heating the stainless steel strip on which the soot deposition layer is formed to a soot deposition rate of 100% to various temperatures. From such a relationship, in the heat treatment furnace, in the region where the temperature of the stainless steel strip is not sufficiently heated in the low temperature region on the upstream side, the temperature of the stainless steel strip is still low and the heat absorption coefficient ε of the steel strip itself is originally low, Since the soot adhesion rate of the stainless steel strip can be maintained as high as almost 100%, its heat absorption rate ε can be maintained at a high level, but the stainless steel strip is heated in the radiant heat heating zone and gradually rises. As the temperature increases, the steel strip temperature rises to 700
When it reaches ~ 800 ° C, the soot adhering to the surface of the stainless steel strip evaporates rapidly and the soot adhering rate on the stainless steel strip drastically decreases, so the heat absorption rate ε of the stainless steel strip also inevitably drops sharply. However, it can be seen that the absorption of radiant heat of the stainless steel strip is significantly reduced. However, in such a high temperature region, the oxidation of the surface of the stainless steel strip proceeds and oxide scale is generated instead of the soot that has been dissipated, so that the heat absorption coefficient ε of the stainless steel strip does not significantly decrease as shown in FIG. is there.
一方、前述したように熱処理炉内で通板中のステンレス
鋼帯の上下表面に煤を付着させるには、ステンレス鋼帯
の上下表面近くにそれぞれ配置されているバーナによつ
て、炭化水素ガスを低空気比（0.01〜１）で不完全燃焼
させたバーナの輝炎により生成し発生させた煤をステン
レス鋼帯の上下表面に付着させるのであるが、一般に炉
内においてより安定して均一で多量な“こつてり”とし
た煤を効率良く付着させる目的を達成するには少なくと
も次のような条件を満たせば良い。On the other hand, as described above, in order to attach the soot to the upper and lower surfaces of the stainless steel strip in the heat treatment furnace in the heat treatment furnace, the hydrocarbon gas is supplied by the burners arranged near the upper and lower surfaces of the stainless steel strip. The soot generated and generated by the bright flame of the burner that is incompletely burned at a low air ratio (0.01 to 1) is attached to the upper and lower surfaces of the stainless steel strip, but it is generally more stable and uniform in the furnace. In order to achieve the purpose of efficiently adhering the soot that has been made into a "kotetsu", it is sufficient to satisfy at least the following conditions.
イ）前述の如くステンレス鋼帯の温度が低温であるこ
と、 ロ）不完全燃焼により安定して煤を生成し発生させると
共に安定して均一で多量な煤を付着するために、バーナ
から混合気体を低圧でソフトに噴出させること、そして
不完全燃焼雰囲気として大気圧又は所定の炉圧よりも＋
0.1〜0.01mmＨ2Ｏ程度高い微圧状態にコントロールする
必要があること、 ハ）煤を有する不完全燃焼輝炎がステンレス鋼帯の上下
表面に安定して接触し、時間的にも充分接触し得るこ
と。B) As mentioned above, the temperature of the stainless steel strip is low, and b) In order to stably generate and generate soot due to incomplete combustion, and to deposit a stable and uniform amount of soot, the mixed gas from the burner Is softly ejected at low pressure, and as an incomplete combustion atmosphere, it is higher than atmospheric pressure or a predetermined furnace pressure +
It is necessary to control to a low pressure state that is as high as 0.1 to 0.01 mmH 2 O. c) The incomplete combustion bright flame with soot is in stable contact with the upper and lower surfaces of the stainless steel strip, and is in good contact with time. To get.
熱処理炉内において上記ロ）項の条件を満足させること
は非常に困難性を伴うのであるが、この条件を満たせな
いと、不完全燃焼輝炎が短かい輝炎となり激しくゆれて
ステンレス鋼帯の上下表面に衝突して後に跳ねる返る状
態となつて、安定して接触させ得ないばかりか充分な接
触時間を保持できないので、前記目的を達成できないの
である。It is extremely difficult to satisfy the condition of the above item (b) in the heat treatment furnace. However, if this condition is not satisfied, the incomplete combustion bright flame becomes a short bright flame and violently shakes and the stainless steel strip The object cannot be achieved because the upper and lower surfaces collide with each other and bounce back later, so that stable contact cannot be achieved and sufficient contact time cannot be maintained.
ところで、このような条件を全て満足させ前記目的を充
分に達成するには、煤をステンレス鋼帯の上下表面に付
着させる位置が重要な要因であり、その位置として熱処
理炉の炉内における輻射熱加熱ゾーン内の上流側ではど
うしても不適当であり、次に列挙するように熱処理炉内
における悪い影響を全く受けずにこれらの条件を自由に
整えられる熱処理炉の炉外の上流側に隣設された横型の
煤付着装置によらざるを得ないのである。すなわちステ
ンレス鋼帯の熱処理炉内では、その入口から通板されて
きたステンレス鋼帯が即加熱され昇温されてしまうので
煤の付着も悪い上に早々に気化されて実質的に輻射熱の
吸収効率が上がらないこと、輻射熱源でありステンレス
鋼帯を加熱するための大容量バーナから激しく発生する
完全燃焼輝炎が炉内に充満している燃焼ガスを撹拌する
と共にその燃焼ガスが鋼帯予熱のために移動させられた
りするし且つ大気圧よりも僅かに高い微圧状態に充分コ
ントロールすることも困難なもので好適な不完全燃焼雰
囲気が得られないこと、そのためソフトな不完全燃焼輝
炎を充分生成し発生できないばかりかこの輝炎をステン
レス鋼帯の上下表面に安定して接触できないと共にその
接触時間も充分保持できないこと、などにより前記目的
を充分に達成できないのである。By the way, the position where the soot is attached to the upper and lower surfaces of the stainless steel strip is an important factor in satisfying all such conditions and sufficiently achieving the above-mentioned object. It is inadequate on the upstream side in the zone, and as listed below, it is adjacent to the upstream side of the heat treatment furnace where these conditions can be adjusted freely without any adverse effects in the heat treatment furnace. We have no choice but to use a horizontal soot adhering device. In other words, in the heat treatment furnace for stainless steel strips, the stainless steel strips that have passed through the inlet are heated immediately and the temperature rises, so the soot adheres poorly and is quickly vaporized to substantially absorb radiant heat. Does not rise, the complete combustion bright flame that is intensely generated from the large-capacity burner for heating the stainless steel strip, which is a radiant heat source, stirs the combustion gas filled in the furnace and the combustion gas preheats the steel strip. Therefore, it is difficult to sufficiently control to a slight pressure state slightly higher than atmospheric pressure because it is difficult to obtain a suitable incomplete combustion atmosphere. The above-mentioned purpose is satisfied by the fact that not only is it sufficiently generated and cannot be generated, but this bright flame cannot be stably contacted with the upper and lower surfaces of the stainless steel strip and the contact time cannot be sufficiently maintained. Than it can not be achieved.
第１図の如く完全密閉されず大気開放状態のもとでバー
ナ燃焼されている横型の熱処理炉２及び煤付着装置３が
配置された連続熱処理装置を使用して、鋼種ＳＵＳ３０
４のオーステナイト系ステンレス冷延鋼帯１を通板し加
熱しながら熱処理した。煤付着装置３は、バーナからの
不完全燃焼輝炎による煤のステンレス鋼帯１の表面への
付着が均一で多量となるように配置した。熱処理炉２の
炉内温度は800℃〜1,100℃に保つた。As shown in FIG. 1, a horizontal heat treatment furnace 2 in which burners are burned under an atmosphere open without being completely sealed and a continuous heat treatment device in which a soot adhering device 3 is arranged are used to make steel grade SUS30.
The cold-rolled austenitic stainless steel strip 1 of No. 4 was passed through and heat treated while heating. The soot adhering device 3 was arranged so that the adhering of the soot onto the surface of the stainless steel strip 1 due to the incomplete combustion bright flame from the burner was uniform and large. The temperature inside the heat treatment furnace 2 was maintained at 800 ° C to 1,100 ° C.
実施例 煤付着装置３には炭化水素ガスとしてプロパンガスを使
用し、空気比を0.1として不完全燃焼させながらステン
レス鋼帯１を熱処理炉２内に通板して熱処理炉出口で鋼
帯温度が所定の800℃に昇温しているように加熱される
最高通板速度を求めたところ15ｍ／分であつた。Example Propane gas was used as the hydrocarbon gas in the soot adhering device 3, the stainless steel strip 1 was passed through the heat treatment furnace 2 while incomplete combustion with an air ratio of 0.1, and the steel strip temperature at the exit of the heat treatment furnace was changed. When the maximum sheet passing speed at which the temperature was raised to a predetermined temperature of 800 ° C. was determined, it was 15 m / min.
比較例 煤付着装置３を作動させなかつたこと以外は実施例と同
様に行つたところ、熱処理炉出口で鋼帯温度が同様に80
0℃に昇温されているように加熱される最高通板速度は
９ｍ／分であつた。Comparative Example When the same procedure as in the example was performed except that the soot depositing device 3 was not operated, the steel strip temperature at the exit of the heat treatment furnace was 80%.
The maximum sheet passing speed for heating as if it had been raised to 0 ° C. was 9 m / min.
以上に詳述した如く本発明方法によれば、ステンレス冷
延鋼帯を所定温度に加熱し熱処理を行う横型の熱処理炉
の炉外で上流側に隣設されている横型の煤付着装置内で
炭化水素ガスを不完全燃焼させたバーナの輝炎によりス
テンレス冷延鋼帯に煤を付着させた後に、前記横型の熱
処理炉で加熱することにより、横型の熱処理炉の入口か
ら入つたばかりの煤付着装置内で煤を付着させたことに
より僅かに予熱された未だ低温のときからステンレス冷
延鋼帯の熱吸収率を高め従つて輻射熱の吸収効率を高め
て高温の所定温度までの昇温時間を短縮することがで
き、そして高温の所定温度域では煤は気化してしまつて
ステンレス冷延鋼帯の表面に何らの悪影響も残すことが
ない。その結果、熱処理能力を大幅に向上させることが
できると共にランニングコストの低減を図ることがで
き、合わせて炉長を短くしてスペースの縮小化や設備費
用の低減を図ることができる。しかも前記煤の付着は、
既存の熱処理炉の炉外の上流側に煤付着装置を隣設すれ
ばよいので、極めて簡単に且つ小投資で実施することが
できる。このような本発明方法は、従来のステンレス冷
延鋼帯連続熱処理方法にはない効果を発揮することがで
きる画期的な方法であり、その工業的価値は非常に大き
なものがある。As described in detail above, according to the method of the present invention, in the horizontal soot adhering device adjacent to the upstream side outside the horizontal heat treatment furnace for heating the cold-rolled stainless steel strip to a predetermined temperature for heat treatment. After the soot was adhered to the stainless cold-rolled steel strip by the bright flame of the burner in which the hydrocarbon gas was incompletely burned, the soot that had just entered from the inlet of the horizontal heat treatment furnace was heated by the horizontal heat treatment furnace. The temperature rise time up to a predetermined high temperature by increasing the heat absorption rate of the stainless cold-rolled steel strip from the time of low temperature, which was slightly preheated by depositing soot in the deposition equipment , And soot is vaporized in a predetermined high temperature range without leaving any adverse effect on the surface of the cold rolled stainless steel strip. As a result, it is possible to significantly improve the heat treatment capability and reduce the running cost, and also shorten the furnace length to reduce the space and the facility cost. Moreover, the attachment of the soot is
Since the soot adhering device may be provided adjacent to the upstream side of the existing heat treatment furnace, it can be carried out extremely easily and with a small investment. Such a method of the present invention is an epoch-making method capable of exerting an effect which is not present in the conventional continuous cold-rolled stainless steel strip heat treatment method, and has an extremely great industrial value.
第１図は本発明方法の実施に好適な横型の煤付着装置を
有する連続熱処理装置の１例の配置系統図、第２図はオ
ーステナイト系ステンレス冷延鋼帯そのままと煤を付着
したものとを大気中で各種温度に加熱した後の熱吸収率
と鋼帯温度の関係を示す比較図、第３図は煤を付着した
オーステナイト系ステンレス冷延鋼帯を各種温度に加熱
した後の鋼帯温度と煤の付着率との関係図である。 １……ステンレス冷延鋼帯 ２……熱処理炉 2a……入口 ３……煤付着装置FIG. 1 is a layout diagram of an example of a continuous heat treatment apparatus having a horizontal soot depositing device suitable for carrying out the method of the present invention, and FIG. 2 shows an austenitic stainless cold-rolled steel strip as it is and a soot-deposited product. A comparative diagram showing the relationship between the heat absorption coefficient and the strip temperature after heating to various temperatures in the atmosphere, and Fig. 3 shows the strip temperature after heating the soot-adhered austenitic stainless cold-rolled strip to various temperatures. FIG. 3 is a relational diagram between the soot deposition rate and the soot deposition rate. 1 …… Stainless steel cold rolled steel strip 2 …… Heat treatment furnace 2a …… Inlet 3 …… Soot deposition device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 後藤 宏二 山口県新南陽市大字富田4976 日新製鋼株 式会社周南製鋼所内 (72)発明者 白井 尭 山口県新南陽市大字富田4976 日新製鋼株 式会社周南製鋼所内 (56)参考文献 特開 昭55−128529（ＪＰ，Ａ) 特公 昭56−8092（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koji Goto 4976 Tomita, Shinnanyo-shi, Yamaguchi Prefecture Nisshin Steel Co., Ltd. Inside the Shunan Steel Works (72) Inventor Kei Shirai, 4976 Tomita, Shinnanyo-shi, Yamaguchi Prefecture Nisshin Steel Co., Ltd. Shunan Steel Works Co., Ltd. (56) References JP-A-55-128529 (JP, A) JP-B-56-8092 (JP, B2)
Claims (1)
ステンレス冷延鋼帯を通板して所定温度に加熱するに際
し、横型の熱処理炉の炉外で上流側に隣設されている横
型の煤付着装置内で炭化水素ガスを不完全燃焼させたバ
ーナの輝炎によりステンレス冷延鋼帯に煤を付着させた
後に、前記横型の熱処理炉で加熱することを特徴とする
ステンレス冷延鋼帯の熱処理方法。1. A horizontal type soot deposit, which is adjacent to the upstream side outside the horizontal type heat treatment furnace when the stainless cold-rolled steel strip is passed through a heat treatment furnace which is mainly heated by radiant heat and heated to a predetermined temperature. Heat treatment of the stainless cold-rolled steel strip characterized by heating soot in the cold-rolled stainless steel strip by a bright flame of a burner incompletely burning hydrocarbon gas in the apparatus, and then heating in the horizontal heat treatment furnace Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62273453A JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62273453A JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01119628A JPH01119628A (en) | 1989-05-11 |
| JPH0629457B2 true JPH0629457B2 (en) | 1994-04-20 |
Family
ID=17528125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62273453A Expired - Lifetime JPH0629457B2 (en) | 1987-10-30 | 1987-10-30 | Heat treatment method for cold rolled stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0629457B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3048012B2 (en) * | 1991-07-10 | 2000-06-05 | 日新製鋼株式会社 | Method for blackening stainless steel strip surface and blackening furnace |
| CN111906142B (en) * | 2020-06-24 | 2022-08-16 | 浙江博星工贸有限公司 | Process for controlling mechanical property of cold-rolled stainless steel strip |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056213B2 (en) * | 1979-03-28 | 1985-12-09 | 新日本製鐵株式会社 | Continuous annealing method and equipment for steel plates |
| DE2926306C2 (en) * | 1979-06-29 | 1981-11-26 | Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern | Sewing machine for connecting two overlapping workpiece layers with a device for guiding the workpiece layers |
-
1987
- 1987-10-30 JP JP62273453A patent/JPH0629457B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01119628A (en) | 1989-05-11 |
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