JPH02294431A - Continuous heat treatment for steel strip - Google Patents
Continuous heat treatment for steel stripInfo
- Publication number
- JPH02294431A JPH02294431A JP11429489A JP11429489A JPH02294431A JP H02294431 A JPH02294431 A JP H02294431A JP 11429489 A JP11429489 A JP 11429489A JP 11429489 A JP11429489 A JP 11429489A JP H02294431 A JPH02294431 A JP H02294431A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- heat treatment
- furnace
- heat
- direct
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 71
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000567 combustion gas Substances 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims description 24
- 238000007254 oxidation reaction Methods 0.000 claims description 24
- 238000011282 treatment Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は鋼帯の連続熱処理方法に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a continuous heat treatment method for steel strip.
（従来の技術）
銅帯の連続熱処理方法において、直火無酸化熱処理によ
り鋼帯の表面を清浄化するとともに熱処理を施すことが
知られている。又このような熱処理に引き続き還元雰囲
気熱処理によって、鋼帯表面の僅少な酸化物を還元し、
次いで、銅帯の温度調整を施すことも知られている。(Prior Art) In a continuous heat treatment method for a copper strip, it is known that the surface of a steel strip is cleaned and heat treated by direct fire non-oxidation heat treatment. In addition, following this heat treatment, a reducing atmosphere heat treatment is performed to reduce the slight oxides on the surface of the steel strip.
It is also known to then subject the copper strip to temperature regulation.
又このような連続熱処理において、熱効率を向上させる
ため上記直火無酸化熱処理（炉）の前に予熱帯（炉）を
設け、該予熱帯でガスを燃焼せしめて鋼帯を予熱し、直
火無酸化熱処理を施すことが試みられている。In addition, in such continuous heat treatment, in order to improve thermal efficiency, a preheating zone (furnace) is provided before the above-mentioned direct fire non-oxidation heat treatment (furnace), and gas is combusted in the preheating zone to preheat the steel strip. Attempts have been made to apply non-oxidizing heat treatment.
更に連続焼鈍後の鋼帯を冷却ロールに接触移動させ徐冷
、急冷することも開示されている（特開昭６３−１６１
１２５号公報）。Furthermore, it is also disclosed that the steel strip after continuous annealing is moved in contact with cooling rolls for gradual cooling and rapid cooling (Japanese Patent Laid-Open No. 63-161).
125 Publication).
しかし、この直火無酸化熱処理では酸化を防止するため
燃料を理論空気量より少ない空気量で燃焼し還元雰囲気
を形成している。このため雰囲気ガスの中には未燃焼ガ
スが多量に存在しており、これをそのまま排出すること
は著しく熱効率を低下させることになる。However, in this direct fire non-oxidation heat treatment, in order to prevent oxidation, the fuel is burned with an air amount smaller than the theoretical air amount to form a reducing atmosphere. Therefore, a large amount of unburned gas exists in the atmospheric gas, and discharging this gas as it is will significantly reduce thermal efficiency.
又前記の如く予熱帯を設ける場合は、鋼帯が予熱される
過程で酸化が生じるため完全な直火無酸化とはならず以
下の欠点があった。Further, when a preheating zone is provided as described above, oxidation occurs during the process of preheating the steel strip, so that complete direct flame oxidation-free operation cannot be achieved, and the following drawbacks occur.
即ち、直火無酸化炉の後段につづく還元雰囲気熱処理炉
において高Ｈｚｌ度（一般に１５〜２０％のＨ Ｚ ＋
残りはＮ２）還元雰囲気を必要とするため処理費用が高
くなる。さらに一旦酸化した面を還元するため表面の粗
度があらくなり、そのため品質も低下することになる。That is, in the reducing atmosphere heat treatment furnace following the direct fire non-oxidation furnace, high HzL degree (generally 15 to 20% H Z +
The rest is N2), which requires a reducing atmosphere, which increases the processing cost. Furthermore, since the once oxidized surface is reduced, the roughness of the surface becomes rough, resulting in a decrease in quality.
しかして、このような予熱処理においては、鋼帯表面に
多量の酸化物が生成し、直火無酸化熱処理により更に僅
少な酸化物が生成するため、熱効率は向上するものの、
後の還元雰囲気熱処理を施しても十分な酸化物（膜）の
除去が困難になり、鋼帯の化成処理、メッキ等の表面処
理が著しく困難になる等の欠点を伴うものである。However, in such preheating treatment, a large amount of oxides are generated on the surface of the steel strip, and even less oxides are generated in the direct fire non-oxidation heat treatment, so although thermal efficiency is improved,
Even if a subsequent heat treatment is performed in a reducing atmosphere, it is difficult to remove sufficient oxides (films), and surface treatments such as chemical conversion treatment and plating of the steel strip become extremely difficult.
（発明が解決しようとする課題）
本発明の目的は、このような欠点を有利に解決すること
のできる鋼帯の連続熱処理方法を徒供するにある。(Problems to be Solved by the Invention) An object of the present invention is to provide a continuous heat treatment method for steel strips that can advantageously solve these drawbacks.
（課題を解決するための手段）
本発明の要旨とするところは、直火無酸化熱処理雰囲気
ガスを燃焼させて得られた燃焼ガスとの熱交換による高
温の熱媒体を流通させるようにした加熱ロールに、鋼帯
を接触移動させて予熱した後、直火無酸化熱処理するこ
とを特徴とする鋼帯の連続熱処理方法にある。(Means for Solving the Problems) The gist of the present invention is that heating is performed by circulating a high-temperature heat medium through heat exchange with combustion gas obtained by burning open flame non-oxidizing heat treatment atmosphere gas. A method for continuous heat treatment of a steel strip, characterized in that the steel strip is moved in contact with a roll to be preheated, and then subjected to direct fire non-oxidation heat treatment.
直火無酸化熱処理は、炉内を無酸化に保持するため、燃
焼用空気比を０．６〜０．９と、１．０以下にして燃焼
（不完全燃焼）しているため、雰囲気ガス中には未燃分
のガスが含まれている。この雰囲気ガス（高温）を熱交
換器へ導き、空気を導入して燃焼し、熱媒体として、例
えば、サームエス（新日鐵化学Ｋ．Ｋ製 商品名）等の
高温熱媒体油等と熱交換し、該熱媒体を高温熱媒体にし
て、これを直火無酸化熱処理（炉）の前でロールへ導き
、加熱ロールとし、この加熱ロールに鋼帯を接触移動せ
しめて予熱処理し、次いで直火無酸化熱処理を施すもの
である。かくしてほぼ完全な直火無酸化熱処理ができる
ため、この直火無酸化熱処理に引き続く還元雰囲気処理
炉では、酸化を抑制するため数％のＨ２濃度（残りＮ．
）の雰囲気でよく、ここで所定時間均熱した後、次いで
鋼帯の温度調整を施すものである．
上記の如き、鋼帯の予熱としては無酸化雰囲気中で鋼帯
を３００゜Ｃ以上にすれば、直火無酸化熱処理（炉）に
おいて、鋼帯の焼鈍等が十分できるが、３００゜Ｃ未満
であると銅帯の直火無酸化熱処理（炉）の時間を長くと
る必要があり、通板速度を低速にする等の処置により生
産性が劣ることになり好ましくない。In direct fire non-oxidation heat treatment, in order to keep the inside of the furnace non-oxidized, the combustion air ratio is set to 0.6 to 0.9, which is less than 1.0 (incomplete combustion), so the atmospheric gas It contains unburned gas. This atmospheric gas (high temperature) is led to a heat exchanger, where air is introduced and combusted, and heat exchanged with a high temperature heat transfer oil such as THERM-S (product name manufactured by Nippon Steel Chemical K.K.) as a heat transfer medium. Then, the heat medium is made into a high-temperature heat medium, which is guided to a roll in front of direct fire non-oxidation heat treatment (furnace) to form a heating roll, and a steel strip is moved in contact with this heating roll for preheating treatment, and then directly heated. It is subjected to fire-free oxidation heat treatment. In this way, almost complete direct fire non-oxidation heat treatment can be performed, so in the reducing atmosphere treatment furnace following this direct fire non-oxidation heat treatment, a few percent H2 concentration (remaining N.
), and after soaking for a predetermined period of time, the temperature of the steel strip is adjusted. As mentioned above, if the steel strip is preheated to 300°C or higher in a non-oxidizing atmosphere, the steel strip can be sufficiently annealed in a direct flame non-oxidizing heat treatment (furnace), but if the temperature is lower than 300°C. If this is the case, it will be necessary to take a long time for the direct fire non-oxidation heat treatment (furnace) of the copper strip, and the productivity will be degraded due to measures such as slowing down the threading speed, which is not preferable.
このような本発明の熱処理方法は、鋼帯の連続焼鈍、溶
融金属メッキの前処理等で、横型炉、竪型炉において有
効に用いることができる．次に本発明の製造例を挙げる
。Such a heat treatment method of the present invention can be effectively used in a horizontal furnace or a vertical furnace for continuous annealing of steel strips, pretreatment for molten metal plating, etc. Next, production examples of the present invention will be given.
第１図は本発明を実施する装置の一例を示す。FIG. 1 shows an example of an apparatus for carrying out the invention.
図において、１は予熱炉で、該予熱炉１内に加熱ロール
２が配置されている。予熱炉１に直火無酸化熱処理炉３
、次いで還元雰囲気熱処理炉４及び温度調整炉５が順次
連設されている。還元雰囲気熱処理炉４の炉雰囲気は窒
素ガスと水素ガスの混合ガスで非酸化性とし、ラジアン
トチューブ６の加熱による間接加熱とする。温度調整炉
５からは炉内雰囲気ガスの一部を連続的に取出し、冷却
器７へ導き、熱交換により冷却した後、鋼帯８に噴射し
て該鋼帯を冷却して温度調整を行う。In the figure, 1 is a preheating furnace, and a heating roll 2 is disposed within the preheating furnace 1. Preheating furnace 1 and direct fire non-oxidation heat treatment furnace 3
Next, a reducing atmosphere heat treatment furnace 4 and a temperature adjustment furnace 5 are successively installed. The atmosphere of the reducing atmosphere heat treatment furnace 4 is made non-oxidizing with a mixed gas of nitrogen gas and hydrogen gas, and indirect heating is performed by heating the radiant tube 6. A part of the furnace atmosphere gas is continuously taken out from the temperature adjustment furnace 5, guided to the cooler 7, cooled by heat exchange, and then injected onto the steel strip 8 to cool the steel strip and adjust the temperature. .
予熱炉１には直火無酸化熱処理炉３のバーナー９での不
完全燃焼ガスが流入しないように仕切壁１５を設ける。A partition wall 15 is provided in the preheating furnace 1 to prevent incomplete combustion gas from the burner 9 of the direct-fired non-oxidizing heat treatment furnace 3 from flowing into the preheating furnace 1.
また予熱炉ｌ内には、窒素源１８より熱交換器１０内の
チューブ１９に導入されて熱交換により２００〜８００
″Ｃに予熱された窒素が導管ｌ６を通じて吹き込まれ、
無酸化雰囲気とされる。なお、その際、窒素ガスを、噴
射ノズル１７を用いて鋼帯８に噴射することにより予熱
能力を高めることができる。In addition, nitrogen is introduced into the preheating furnace l from the nitrogen source 18 into the tube 19 in the heat exchanger 10, and by heat exchange, 200 to 800
Nitrogen preheated to ``C'' is blown through conduit l6;
It is assumed to be a non-oxidizing atmosphere. Note that at this time, the preheating ability can be increased by injecting nitrogen gas into the steel strip 8 using the injection nozzle 17.
直火無酸化熱処理炉３内の無酸化雰囲気ガス（不完全燃
焼ガス）は、予熱炉ｌに流入する手前で熱交換器１０ヘ
ガス導管１１を通じて導かれ、同時にブロワー１２によ
り、燃焼用空気が熱交換器１０内に導入されて完全燃焼
せしめられる。The non-oxidizing atmospheric gas (incomplete combustion gas) in the direct-fired non-oxidizing heat treatment furnace 3 is guided through the gas conduit 11 to the heat exchanger 10 before flowing into the preheating furnace 1, and at the same time, the blower 12 heats the combustion air. It is introduced into the exchanger 10 and completely combusted.
方タンク１３から熱交換器１０のチューブ１４へ熱媒体
が供給され、熱交換により、高温熱媒体とされ、予熱炉
１内の加熱ロール２へ供給されて該ロール２を加熱する
。A heat medium is supplied from the tank 13 to the tubes 14 of the heat exchanger 10, converted into a high-temperature heat medium through heat exchange, and supplied to the heating roll 2 in the preheating furnace 1 to heat the roll 2.
鋼帯８は、まず予熱炉１に導入され、加熱ロール２に接
触しつつ移動せしめられ、予熱されて、直火無酸化熱処
理炉３へ導入され、無酸化にて熱処理が施される。次の
還元雰囲気熱処理炉４においては、従来の如く還元処理
のために高Ｈ２濃度雰囲気での熱処理は不要となり、１
〜５％の低Ｈ２濃度の通常の非酸化性雰囲気で均熱熱処
理された後、温度調整炉５へ導入されて、後処理に好適
な温度に冷却される。The steel strip 8 is first introduced into the preheating furnace 1, moved while in contact with the heating roll 2, preheated, and introduced into the direct fire non-oxidation heat treatment furnace 3, where it is heat treated without oxidation. In the next reducing atmosphere heat treatment furnace 4, heat treatment in a high H2 concentration atmosphere is no longer required for reduction treatment as in the past, and 1
After being soaked in a normal non-oxidizing atmosphere with a low H2 concentration of ~5%, it is introduced into a temperature control furnace 5 and cooled to a temperature suitable for post-treatment.
（実施例） 次に本発明の実施例を比較例とともに挙げる。(Example) Next, examples of the present invention will be listed together with comparative examples.
実施例
加熱ロール（直径１０００ｍｍ ）直列４本（ロール１
本当りの銅帯接触長０．８ｍｍ）、ロール加熱温度５５
０”Ｃ，ラインスピード１５０ｍ／分で、銅帯を４００
゜Ｃに予熱し、次いで直火無酸化熱処理炉（燃料コーク
ス炉発生ガス、空気比０．７、炉温１２００゜Ｃ）へ導
き、処理時間５〜１０秒、銅帯温度７５０゜Ｃの熱処理
を施し、次いで、還元雰囲気熱処理炉Ｕｚガス９５％、
Ｈ２ガス５％の雰囲気、炉温７７０゜Ｃ）へ導き、処理
時間４０秒、鋼帯温度７５０″Ｃの熱処理を施すと同時
に銅帯表面の僅少酸化物を還元し、次いで鋼帯の温度調
整炉（Ｎ２ガス９５％、Ｈ２ガス５％の雰囲気）へ導き
、１０秒間で鋼帯を４８０゜Ｃに冷却した。Example Heating rolls (diameter 1000 mm) 4 in series (roll 1
Actual copper strip contact length 0.8 mm), roll heating temperature 55
0”C, line speed 150m/min, copper strip 400mm
Preheated to ℃, then led to a direct fire non-oxidation heat treatment furnace (fuel coke oven generated gas, air ratio 0.7, furnace temperature 1200℃), heat treatment for 5 to 10 seconds, copper strip temperature 750℃. and then a reducing atmosphere heat treatment furnace Uz gas 95%,
The copper strip was heated to an atmosphere of 5% H2 gas (furnace temperature 770°C), treatment time was 40 seconds, and the steel strip temperature was 750"C. At the same time, slight oxides on the surface of the copper strip were reduced, and then the temperature of the steel strip was adjusted. The steel strip was introduced into a furnace (atmosphere of 95% N2 gas and 5% H2 gas) and cooled to 480°C in 10 seconds.
得られた鋼帯表面の酸化物は殆どなく、確実に還元され
ていた。There were almost no oxides on the surface of the obtained steel strip, indicating that it had been reliably reduced.
比較例
予熱炉で直火無酸化炉の未燃ガスに不足分の空気を吹込
み完全燃焼せしめて、炉温を８００〜１０００゜Ｃに保
持し、綱帯を４００゜Ｃまで６秒で予熱した後、実施例
に示す如き条件で、直火無酸化熱処理炉、還元雰囲気熱
処理炉、鋼帯温度調整炉で順次処理した．鋼帯表面の酸
化物は直火無酸化炉出口で１２００人残留していた。Comparative Example: In a preheating furnace, the unburned gas in the direct-fired non-oxidation furnace is blown with air to complete combustion, the furnace temperature is maintained at 800 to 1000°C, and the rope is preheated to 400°C in 6 seconds. After that, they were sequentially treated in a direct fire non-oxidation heat treatment furnace, a reducing atmosphere heat treatment furnace, and a steel strip temperature adjustment furnace under the conditions shown in the examples. 1,200 oxides remained on the surface of the steel strip at the outlet of the direct-fired non-oxidizing furnace.
（発明の効果）
本発明によれば、酸化物の発生を抑制しつつ、予熱処理
ができ、鋼帯（板）表面の後処理が還元処理のための高
Ｈ２濃度雰囲気ガスを使用することなく確実にでき、品
質を向上することができる。(Effects of the Invention) According to the present invention, preheating treatment can be performed while suppressing the generation of oxides, and post-treatment of the steel strip (plate) surface can be performed without using high H2 concentration atmospheric gas for reduction treatment. This can be done reliably and the quality can be improved.
又直火無酸化熱処理炉の排ガスを有効利用でき熱効率を
向上することができる等の優れた効果が得られる。Further, excellent effects such as being able to effectively utilize the exhaust gas from the direct-fired non-oxidizing heat treatment furnace and improving thermal efficiency can be obtained.
第１図は本発明を実施する装置の一例を示す図である。
１：予熱炉、２：加熱ロール、３：直火無酸化熱処理炉
、４：還元雰囲気熱処理炉、５：温度調整炉、６：ラジ
アントチューブ、７：冷却器、８：鋼帯，９：バーナー
ｌＯ：熱交換器、ｌ工：導管、１２：ブロワー １３
：熱媒体用タンク、１４：チューブ、１５：仕切壁、１
６：導管、１７：噴射ノズル、１８：窒素源、１９：チ
ューブFIG. 1 is a diagram showing an example of an apparatus for implementing the present invention. 1: Preheating furnace, 2: Heating roll, 3: Direct fire non-oxidation heat treatment furnace, 4: Reducing atmosphere heat treatment furnace, 5: Temperature adjustment furnace, 6: Radiant tube, 7: Cooler, 8: Steel strip, 9: Burner lO: heat exchanger, l: conduit, 12: blower 13
: Heat medium tank, 14: Tube, 15: Partition wall, 1
6: Conduit, 17: Injection nozzle, 18: Nitrogen source, 19: Tube
Claims (2)
た燃焼ガスとの熱交換による高温の熱媒体を流通させる
ようにした加熱ロールに、鋼帯を接触移動させて予熱し
た後、直火無酸化熱処理することを特徴とする鋼帯の連
続熱処理方法。(1) Direct fire non-oxidation heat treatment After preheating the steel strip by contacting it with a heating roll through which a high-temperature heat medium flows through heat exchange with the combustion gas obtained by burning atmospheric gas, the steel strip is preheated. A continuous heat treatment method for steel strip characterized by fire-free oxidation heat treatment.
囲気熱処理、温度調整処理することを特徴とする請求項
１記載の鋼帯の連続熱処理方法。(2) The continuous heat treatment method for a steel strip according to claim 1, characterized in that the steel strip is preheated, and then subjected to direct fire non-oxidation heat treatment, reducing atmosphere heat treatment, and temperature adjustment treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11429489A JPH02294431A (en) | 1989-05-09 | 1989-05-09 | Continuous heat treatment for steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11429489A JPH02294431A (en) | 1989-05-09 | 1989-05-09 | Continuous heat treatment for steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02294431A true JPH02294431A (en) | 1990-12-05 |
Family
ID=14634260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11429489A Pending JPH02294431A (en) | 1989-05-09 | 1989-05-09 | Continuous heat treatment for steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02294431A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04178209A (en) * | 1990-11-09 | 1992-06-25 | Nippon Steel Corp | Device for controlling bent of plate on hot finish rolling mill |
-
1989
- 1989-05-09 JP JP11429489A patent/JPH02294431A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04178209A (en) * | 1990-11-09 | 1992-06-25 | Nippon Steel Corp | Device for controlling bent of plate on hot finish rolling mill |
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