585926 玖、發明說明 [發明所屬之技術領域] 本發明係有關於連續加熱處理金屬帶所使用之熱 二：特徵具有，在預備加熱該金屬帶之預熱領域抑：全 :::二化’使該金屬帶在加熱領域被適當的 = 並可抑制在加熱領域内含有的氫氣還原氣 [先前技術] 迄：，為了連續加熱處理金屬帶已使用有各式各樣 熱處理爐。 、〇私的 ϋ如這樣的熱處理爐係使用有，將空氣等由金屬帶導 預::域’被導入該預熱領域之金屬帶以直接； J有;氣；Γ預熱領域接連之加熱領域、使該金屬帶 千延原虱體環境中間接加熱且退火之第1埶产 理爐；將由導入D道χ …、處 域同樣的氫氣還原氣之金屬帶在含有與加熱領 熱領域接連之力二：T 熱預熱後’在與該預 體環境中間接加熱且退火之第2熱處理爐Γ 在此’如上述將 I熱處理爐直接吨火預：¥入預熱領域之金屬帶在第 體被導A1、、 即使在加熱領域含有的氫氣還 原孔月且破¥入該預瓿 座 耗，而可防止氫氣：1還原氣體中的氫氣被燃燒消 ^ e Λ ;、、二由導入金屬帶之導入口漏出外部。 可疋’在第1教# 咏 炎丄+ 因此在金屬帶表面：爐，為由直接點火預熱金屬帶， 被氧化之虞，特別，係在變更操作條 314691 5 件等之時，金讲 w蜀V的表面有氧化之情事。 加二i中=;=!帶!表面有被氧化，其後，即使在 間接加熱退；^ τ置於含有風氣的還原氣體環境中使 寸，δ亥金屬帶也無法充分的還眉，1 π处你 u適當的加埶# 、原就不此訑 電解槽浸心 將如此加熱處理過後的金屬帶導入 另一 X 了有所謂無法適當被電鍍之問題。 與加熱二由導入口導入預熱領域之金屬帶在含有 使間接加埶預广'乳遂原氣體環境中在第2熱處理爐中 …、頂a，係如將金屬帶置於第〗挪古 接點火預埶俾以★1 、乐1熱處理爐中以直 、 俾以抑制金屬帶表面被氧化。 μ 、； 第2熱處理爐的情形，在預埶领竹入古^ & 遏原氣體有通過邋λ 、…、7員域含有的虱氣 、V入口漏出外部之問 Θ 處理不銹鋼帶材或古 、知·另〗疋，在加熱 氣體中的氫氣濃度、如水 上述在還原 不但非常的危險，同0士古=度的風W原氣體漏出外部 J曰丄7 J守π <貝的虱氣大多白白的、自毪 鍉南了所謂運轉成本之問題。 白的被浪費，而 本發明之速續a 力ϋ熱處理金屬帶所使用之却忐 , 鑑於上述之各項問 r便用之熱處理爐係有 貝問噠而開發者。 在本發明，兔 了防止如由導入口導 帶以直接點火預埶之# 、員…、湏域之金屬 化，因此採用將由I 便孟屬γ的表面被氧 丄Α ν 導入預熱領域之全屬册少八各 加熱領域同樣的氫翁^ 孟屬Τ在含有與 第2熱處理燐。 Τ使間接加熱作預熱之 31469] 6 585926 2熱處理爐，可防止 之導入口漏出外部， 也能安全使用的同 而且，於本發明，如在上述的第 含有氫氣的還原氣體經由導入金屬帶 即使將還原氣中氫氣的濃度提高時， 時，也能減低運轉成本作為課題。 [發明内容] 十又 解決課題之手 在本發明，為了解決如上述的課題，在連續加熱處理 金屬帶之熱處理爐、連續設置有將由導 守八口導入之金屬帶 在惰性氣體環境中間接加熱之預熱領域與，在該預熱領域 中預熱之金屬帶在含有氫氣還原氣體環境中間接加熱之加 熱領域，比上述預熱領域的内壓使提高加熱領域的内壓的° 同時，在預熱領域與加鈦領城之問^L要 刀…項兑之間5又置有抑制加熱領域内 的還原氣體流出到預熱領域内的抑制機構。 而且如本叙明之熱處理爐，若在預熱領域中由導入 口導入之金屬帶置於惰性氣體環境中使間接加熱時，就如 同將金屬帶以直接點火預熱的情形可防止金屬帶表面被氧 化。該結果，在加熱領域將該金屬帶在含有氫氣還原氣體 環境中使間接加熱退火時，該金屬帶被充分的還原、施行 適當=加熱處3，可使將該金屬帶導人電解槽浸鐘時做適 田的电鍍此外，作為上述惰性氣體，雖能使用各種惰性 氣體’但從成本面而言，使用氮氣較為理想。 、再者如本發明之熱處理爐、加熱領域的内壓比預熱 領域的内壓南’則可抑制在預熱領域内之惰性氣體流入加 热項域内。又，右在預熱領域與加熱領域之間設置抑制加 7 314691 585926 _或内的還原氣流出到預熱領域内的抑制機構，也可抑 制在加熱領域内含有氮氣之還原氣體甚多流入預熱領域且 經由導入口漏出外部之情事。因此，如加熱處理不錢鋼帶 材或高張力鋼帶材時等，即使提高在加熱領域之還原氣# 中的氫氣濃度，也無所謂高濃度的氯氣還原氣體漏出外= 之危險性㈣時，也無所謂有高價的氯氣甚多白白的被浪 費’而提南了運轉成本之問題。 再者，在本發明之熱處理爐，在導出如上述被加熱處 理之金屬帶之出π側，連續設置有浸錢該金屬帶之電解 槽，則可使被加熱處理之金屬帶被適當的電錄之同時，也 可防止加熱領域内含的氫氣還原氣體自該熱處 側漏出。 J山 又，在本發明之熱處理爐，在導出如在上述被加熱處 理的金屬帶之出口側，設有已填充惰性氣體之冷卻領域， :以冷卻領域的㈣比上述加熱領域的内麼低的同時，若 p制加熱項域内的還原氣體流出到該冷卻領域内的 二:機構’及可抑制在冷卻領域内之惰性氣體流入加 的同時’也抑制了在加熱領域内含有的氯氣還眉 才、月且彡流入該冷卻領域内由出口側 [實施方式] 月争 、根據"】、、附圖式具體的說明有關於在本發明實施 例之熱處理爐。 、 實施^^ 貝知例1之熱處理爐係如在第】圖所示，金屬帶】由 314691 8 585926 導入口 10導入已填充惰性氣體之預熱領域η内，在該預 熱領域u内使上述金屬帶！在惰性氣體環境中間接加熱、 做預熱。 在此，該實施例1 ’係在上述預熱領域丨丨内自惰性 氣體供給裝置12供給作為惰性氣體之氮氣。而且，若如 此在已供給惰性氣體之預熱領域1 1内由道 等入口 所導八 之金屬帶1藉由間接加熱裝f 13間接加熱，及如將金屬 帶i以直接點火預熱時可防止金屬帶i的表面被氧化。 接著，如上述將已預熱之金屬帶i透過連結㈣ 11與加熱領域14之第i連結部15導入加熱領域14内， 在該加熱領域Μ内，將上述金屬帶】在含有氫氣 體之中間接加熱，使金屬帶丨一邊還原—邊退火。 在此’該實施例i係在上述加熱領域14内自還原氣 體供給裝置16供給含氫氣之還原氣體，如此在已供給含 虱氣之還原氣體之加熱領域14内，藉由間接加熱裝置Η 間接加熱金屬帶1。 再者’如在上述加熱領域14内由還原氣體供給裝置 給含氫氣之還原氣體中，將該加熱領域Μ之内㈠ ΓΓ裝置（未圖示）控制在比上述預熱領域η之内壓稍曰 和支尚、以防止在預敎作 ^ ^ 、…、7員或1 1内之惰性氣體流入該加熱領 域1 4内。 、 在連、’。預熱領域11與加熱領域14之上述第丨連 二熱二=:; =域14内含氫氣之還原氣體流出 制機構1 8，在接近送料滾子]8 a設 31469] 9 斤P止構件1 8b。該結果，可抑制在加熱領域14内含氫 氣所遲原氣體透過第1連結部1 5流入預熱領域1 1内，且 "p制自預熱領域1 1經過上述導入口 1 0與惰性氣體一起 含有氫氣的還原氣體漏出外部。 而且’如上述在加熱領域1 4内使間接加熱後之金屬 ^ 將金屬帶1透過連結加熱領域1 4與冷卻領域1 9 之第2連結部2〇導入與加熱領㉟4同樣已供給含有氫氣 之還原氣體之第丨冷卻領域19内，在該第1冷卻領域19 内冷部上述金屬帶1。 接著將。亥金屬可1透過連結第1冷卻領域]9與第 2冷卻，領域2丨之第3連結部22導入第2冷卻領域^内， 在該第2冷卻領域21内使上述金屬_丨的溫度均一化。 其後’將該金屬帶！透過導出部23導人收容電解液^ 之電解槽2 4，浸鍍金屬帶1。 在該實施例1之熱處理爐，如上述在預熱領域U金 屬帶1的表面不會被氧化’由於該金屬帶1於加孰領域14 被適當的還原且退火，因此如上述金屬帶Μ電鍍時，可 適當的電鍍該金屬帶1。 實施例 2 肛見化⑺▲心热蜒段繼，係如第2圖所示，與上述^ 施例1之熱處理爐情形㈣，將金屬$ i由導人口 μ導 入填充有惰性氣體之預熱領域11内 ^ 在该預熱領域1 1内 使金層帶1在惰性氣體環境中被間接加熱預熱。 而且，將如此被預熱之金屬帶】透 可处過上述抑制機構1丨 ]〇 3J4691 戶斤汉置之第1連結部15導入加熱領域14内，在該加熱領 威14内’在含有氫氣的還原氣體中間接加熱上述金屬帶 1，使金屬帶1 一邊還原、一邊退火。 其後，將該金屬帶1透過第2連結部2〇導入與加熱 領域14同樣已供給含有氫氣的還原氣體之第1冷卻領域 i 9内’在該第1冷卻領域19使金屬帶1冷卻。 接著’在該實施例2之熱處理爐，將如上述在第丨冷 卻領域19内被冷卻之金屬帶1，透過連結該第1冷卻領 威1 9與第2冷卻領域2 1之第3連結部22導入已填充有 惰性氣體之第2冷卻領域21内。然後，在該第2冷卻領 威2 1内使上述金屬帶丨的溫度均一化之後，將該金屬帶 i，透過導出口 25送出外部。 在此，將該實施例2之熱處理爐，係如在上述第2冷 卻領域21内自惰性氣體供給裝置26供給作為惰性氣體之 氣氣由控制裝置（未圖示）控制使該第2冷卻領域2 1之 内壓比上述第丨冷卻領域19之内壓稍微低。若如此做， 町抑制在該第2冷卻領域2丨内的惰性氣體透過第3連結 部22流入第丨冷卻領域19内，更可抑制透過上述第2連 結。P - 0 入加熱領域1 4内。 再者，在連結第1冷卻領域19與第2冷卻領域21之 上述第3連結部22内，作為抑制在第i冷卻領域19内含 氫氣之還原氣體流出到第2冷卻領域21内之第2抑制機 構，在接近供料滾子27a設有抑止構件2几。該結果，可 P —有氫氣的還原氣體與在第2冷卻領域2 1内之惰性 Π 314691 585926 氣體一起透過上述導出口 25漏出外部。 然而，在上述實施例1、2，雖設置有兩個冷卻領域i 9、 2 1，但未必必須設置兩個冷卻領域，可設置一個冷卻領域， 變更可隨意施行。 之熱處理爐，由於作成自導入 環境中之預熱領域使間接加 金屬帶的情形並無所謂有金屬 熱領域將該金屬帶置於含有氫 加熱且退火時，該金屬帶被充 理’將該金屬帶導入電解槽浸 〇 理爐’由於作成加熱領域的内 此可抑制在預熱領域之惰性氣 方、在預熱領域與加熱領域之間 氣體流出預熱領域之抑制機 域内含有的氫氣還原氣體大多 外部。 銹鋼帶材，施行電鍍時等，即 體中氫氣的濃度，纟沒有所謂 外部之危險性，同時也沒有所 費，而提高運轉成本花費之情 或設置更多個冷卻領域等之 發明效果 如以上詳述，在本發明 口將金屬帶導入在惰性氣體 熱，因此如以直接點火預熱 帶表面被氧化之危險，在加 氣的還原氣體環境中使間接 分的還原施行適當的加熱處 鍍時，可適當的電鍍金屬帶 再者，在本發明之熱處 壓比預熱領域的内壓高，因 體流入加熱領域内。又，由 設置有抑制加熱領域内還原 構，因此也可抑制在加熱領 流入預熱領域自導入口漏出 該結果，如加熱處理不 使提高在加熱領域之還原氣 南濃度的氫氣還原氣體漏出 謂南價的氫氣多半被白白浪 事0 [圖式簡單說明] 31469] 】2 585926 第1圖係有關於本發明實施例1之熱處理爐概略說明 圖。 第2圖係有關於本發明實施例2之熱處理爐概略說明 圖。 1 金 屬 帶 10 導入 口 11 預 献 領域 12 惰 性氣 體 供 給 裝 置 13 間 接 加熱 裝 置 14 加 熱領 域 15 第 1 連結 部 16 還 原氣 體 供 給 裝 置 17 間 接 加熱 裝 置 18 抑 制機 構 19 第 1 冷卻 領 域 20 第 2連 結 部 21 第 2 冷卻 領 域 22 第 3連 結 部 23 導 出 部 24 解槽 25 導 出 Ό 26 惰 性氣 體 供 給 裝 置 27 第 2 抑制 機 構 13 314691585926 发明 Description of the invention [Technical field to which the invention belongs] The present invention relates to the heat used for continuous heat treatment of a metal strip: the feature is that in the field of preheating for preheating the metal strip: full ::: secondization ' The metal strip is appropriately heated in the heating field = and hydrogen reducing gas contained in the heating field can be suppressed [prior art] So far: various heat treatment furnaces have been used for continuous heat treatment of the metal strip. 〇Private heat treatment furnaces such as this are used to guide air and other metal strips :: domain 'is introduced into the metal strip of the preheating field to directly; J has; gas; Γ preheating field successive heating Field, the first heat treatment furnace that indirectly heats and anneals the metal strip in the environment of the protozoan body; the metal strip containing the hydrogen reducing gas introduced into the D track χ, ... in the same region is successively connected to the field containing the heating heat Force 2: After the T-heat preheating, 'the second heat treatment furnace that is indirectly heated and annealed in the pre-environment, Γ Here', as described above, the I heat treatment furnace is directly fired: ¥ The metal strip that enters the preheating field is in the first place. The body is guided A1, even if the hydrogen contained in the heating field is reduced and the hole is broken into the pre-amplifier, it can prevent hydrogen: 1 the hydrogen in the reducing gas is burned and eliminated ^ e Λ; The inlet of the belt leaks out.可 疋 '在 第 1 教 # Yong Yan 丄 + Therefore on the surface of the metal strip: the furnace, the metal strip is preheated by direct ignition, it may be oxidized, especially when changing the operating strip 314691 5 pieces, etc. There is oxidation on the surface of w Shu V. In addition, the surface of the second i =; =! Zone! Has been oxidized, and then, even if it is indirectly heated to retreat; ^ τ is placed in a reducing gas environment containing wind, so that the δ Hai metal belt can not fully return, 1 You should add the appropriate ## at π, which is not the case. The electrolytic cell is immersed in the heart to introduce the heat-treated metal strip into another X. There is a problem that it cannot be properly plated. And heating. The metal strip introduced into the preheating area from the inlet is placed in a second heat treatment furnace in an environment that contains indirect pre-heating and lactation gas. In the second heat treatment furnace ... After the ignition is preliminarily treated with ★ 1 and Le1 in a heat treatment furnace, the surface of the metal strip is prevented from being oxidized. In the case of the second heat treatment furnace, in the pre-leadering of the bamboo into the ancient ^ & the original gas through the 虱 λ, ..., the lice gas contained in the 7-member field, V inlet leaks outside the question Θ processing stainless steel strip or Ancient, know, and other】 疋, the hydrogen concentration in the heating gas, such as water, is not only very dangerous in reducing the above, the same as the wind of 0 Shigu = degrees of the original gas leaked outside J 丄 J7 J 守 π < Most of them are vain, and they have called the problem of running costs. White wasted, while the present invention continues to use the heat treatment metal belt, but in view of the above-mentioned problems, the heat treatment furnace used in this article has been developed. In the present invention, to prevent metallization of #, members, and so on, such as by direct ignition of the guide belt of the inlet port, it is used to introduce the surface of the genus γ by oxygen 丄 Α ν into the preheating field. All genus albums have the same hydrogen in each heating field ^ Mengenus T contains the second heat treatment. 31469] 6 585926 2 heat treatment furnace that can prevent indirect heating from being introduced to the outside and can also be used safely. In addition, in the present invention, as described above, the first reducing gas containing hydrogen is introduced into the metal belt. Even when the concentration of hydrogen in the reducing gas is increased, it is possible to reduce the running cost as a problem. [Summary of the Invention] In order to solve the above-mentioned problems, in the present invention, in order to solve the above-mentioned problems, a heat treatment furnace for continuously heat-treating a metal belt is continuously provided with a metal belt introduced by the guide eight mouths indirectly heated in an inert gas environment. The preheating field and the heating field in which the preheated metal strip is heated indirectly in an environment containing a hydrogen reducing gas, the internal pressure of the heating field is increased by an amount of ° more than the internal pressure of the above preheating field. Between the preheating area and the titanium collar city, it is necessary to use a knife ... between the item 5 and a suppression mechanism for suppressing the reduction gas in the heating area from flowing out into the preheating area. Moreover, if the heat treatment furnace described in this description, if the metal strip introduced from the inlet in the preheating field is placed in an inert gas environment for indirect heating, it is like preheating the metal strip with direct ignition to prevent the surface of the metal strip from being heated. Oxidation. As a result, when the metal strip is annealed indirectly in an environment containing a hydrogen-reducing gas in the heating field, the metal strip is sufficiently reduced and appropriately applied = heating place 3, so that the metal strip can be led into an electrolytic bath and immersed in a bell. Shita electroplating is also performed. In addition, as the inert gas, various inert gases can be used. However, in terms of cost, it is preferable to use nitrogen. Furthermore, if the internal pressure of the heat treatment furnace and the heating field of the present invention is higher than the internal pressure of the preheating field, the inert gas in the preheating field can be prevented from flowing into the heating field. In addition, a suppression mechanism is provided between the preheating area and the heating area to suppress the reduction gas flow in the preheating area from 7 314691 585926 _. It can also prevent the reducing gas containing nitrogen in the heating area from flowing into the preheating area. In the thermal field, leaks from the outside through the inlet. Therefore, for example, when heat-resistant steel strips or high-tensile steel strips are heated, even if the hydrogen concentration in the reducing gas # in the heating field is increased, there is no so-called high concentration of chlorine reducing gas leakage. It does not matter that there is a lot of expensive chlorine gas wasted in vain ', and the problem of running costs is raised. Furthermore, in the heat treatment furnace of the present invention, an electrolytic cell in which the metal strip is immersed is continuously provided on the π side where the metal strip is heated as described above, so that the metal strip to be heated can be appropriately charged. At the same time, it can also prevent the hydrogen reducing gas contained in the heating area from leaking from the hot side. In the heat treatment furnace of the present invention, a cooling area filled with an inert gas is provided on the exit side of the metal belt to be heated as described above. Is the cooling area lower than that in the heating area? At the same time, if the reducing gas in the heating system of p system flows out to the second cooling zone: the mechanism 'and the inflow of inert gas in the cooling zone can be suppressed, and the chlorine gas contained in the heating zone is also suppressed. Only the cooling power flows into the cooling field from the outlet [Embodiment] Monthly description, according to "], the detailed description of the drawings relates to the heat treatment furnace in the embodiment of the present invention. ^^ The heat treatment furnace of Example 1 is shown in the figure. The metal belt is introduced from the 314691 8 585926 inlet 10 into the preheating area η filled with inert gas, and is used in the preheating area u. Above the metal belt! Preheat indirectly in an inert atmosphere. Here, this embodiment 1 'is to supply nitrogen as an inert gas from the inert gas supply device 12 in the above-mentioned preheating area. Moreover, if in this way the metal strip 1 guided by the entrance in the preheating area 11 where the inert gas has been supplied is heated indirectly by the indirect heating device f 13 and if the metal strip i is preheated by direct ignition, The surface of the metal tape i is prevented from being oxidized. Next, as described above, the preheated metal belt i is introduced into the heating area 14 through the i-th connection portion 15 connecting the ㈣ 11 and the heating area 14. In the heating area M, the metal belt i is contained in a gas containing hydrogen. Indirect heating causes the metal strip to be reduced and annealed. Here, 'this embodiment i is to supply a reducing gas containing hydrogen from the reducing gas supply device 16 in the above-mentioned heating area 14, so that in the heating area 14 where the reducing gas containing lice gas has been supplied, the indirect heating device Η indirectly Heating the metal strip 1. Furthermore, if the reducing gas supply device is used to supply hydrogen-containing reducing gas in the heating area 14, the heating area M is controlled by a ΓΓ device (not shown) at a pressure slightly higher than the internal pressure of the preheating area η. He Zhishang said to prevent the inert gas in the pre-operation ^ ^, ..., 7 members or 11 from flowing into the heating area 14. , At the company, ’. Preheating area 11 and heating area 14 are the second and the second heat == ;; = the reducing gas containing hydrogen in the area 14 flows out of the mechanism 18, near the feed roller] 8 a set 31469] 9 kg P stop member 1 8b. As a result, the late primary gas containing hydrogen in the heating area 14 can be prevented from flowing into the preheating area 11 through the first connection portion 15 and the self-preheating area 11 made by "p" passes through the introduction port 10 and inert. The gas together with the reducing gas containing hydrogen leaks out. And 'the metal heated indirectly in the heating area 14 as described above ^ The metal strip 1 is passed through the second connection portion 20 connecting the heating area 14 and the cooling area 19, and the heating collar 4 is also supplied with hydrogen containing In the first cooling region 19 of the reducing gas, the metal strip 1 is cooled in the first cooling region 19. Then will. The metal can be connected to the first cooling zone through the first cooling zone] 9 and the second cooling, and the third connection portion 22 of the zone 2 丨 is introduced into the second cooling zone ^, and the temperature of the metal _ 丨 is uniformed in the second cooling zone 21. Into. After that ’s the metal! The lead-out portion 23 guides the electrolytic cell 24 containing the electrolyte ^, and the metal strip 1 is immersed. In the heat treatment furnace of this embodiment 1, as described above, the surface of the U metal strip 1 in the preheating area will not be oxidized. Since the metal strip 1 is appropriately reduced and annealed in the plus region 14, the metal strip M is electroplated as described above. In this case, the metal strip 1 can be appropriately plated. Example 2 Seeing the anus in the anus ▲ ▲ Heart-heating section, as shown in Figure 2, and the heat treatment furnace in Example 1 above ㈣, the metal $ i is introduced from the guide population μ into the preheating filled with inert gas. In the field 11 ^ In the preheating field 11, the gold layer belt 1 is indirectly heated and preheated in an inert gas environment. In addition, the pre-heated metal belt] can pass through the above-mentioned suppression mechanism 1 丨] 〇3J4691 The first connection portion 15 of the householder is placed in the heating area 14 and the heating power 14 is contained in the heating power 14 The metal strip 1 is heated indirectly in a reducing gas such that the metal strip 1 is annealed while being reduced. Thereafter, the metal strip 1 is introduced through the second connection portion 20 into the first cooling region i 9, which has been supplied with a reducing gas containing hydrogen in the same manner as the heating region 14, and the metal strip 1 is cooled in the first cooling region 19. Next, in the heat treatment furnace of the second embodiment, the metal strip 1 cooled in the first cooling area 19 as described above is connected through the third connection portion of the first cooling power 19 and the second cooling area 21. 22 is introduced into the second cooling area 21 filled with an inert gas. Then, after the temperature of the metal strip 丨 is made uniform in the second cooling power 21, the metal strip i is sent out through the outlet 25. Here, the heat treatment furnace of the second embodiment is such that a gas supplied as an inert gas from the inert gas supply device 26 in the second cooling area 21 is controlled by a control device (not shown) to make the second cooling area. The internal pressure of 21 is slightly lower than the internal pressure of the above-mentioned cooling area 19. By doing so, it is possible to suppress the inert gas in the second cooling region 2 into the third cooling region 19 from flowing into the second cooling region 19, and to further suppress the second connection. P-0 enters the heating area 1 4. Furthermore, in the third connecting portion 22 that connects the first cooling area 19 and the second cooling area 21, the second cooling area 21 suppresses the reduction gas containing hydrogen in the i-th cooling area 19 from flowing out into the second cooling area 21. The restraining mechanism is provided with a restraining member 2 adjacent to the feed roller 27a. As a result, the P-reducing gas containing hydrogen and the inert gas 314 691 585 926 in the second cooling area 21 may leak through the above-mentioned outlet 25 to the outside. However, in the first and second embodiments described above, although two cooling areas i 9 and 21 are provided, it is not necessary to provide two cooling areas. One cooling area may be provided, and changes may be performed at will. In the heat treatment furnace, it is not necessary to add the metal strip indirectly due to the pre-heating field introduced into the environment. When the metal strip is placed under hydrogen heating and annealing, the metal strip is filled. With the introduction of an electrolytic cell immersion furnace, it can suppress the inert gas in the preheating area and the gas flowing out between the preheating area and the heating area. The hydrogen reducing gas contained in the preheating area can be suppressed. Mostly external. For stainless steel strips, when plating, etc., that is, the concentration of hydrogen in the body, there is no so-called external danger, and at the same time, there is no cost. However, the effect of increasing the operating cost or setting up more cooling fields is as follows: As described in detail above, the metal strip is introduced into the inert gas heat at the port of the present invention. Therefore, if the direct heating is used to pre-heat the surface, the danger of being oxidized will be reduced. In addition, a suitable electroplated metal strip may be used. In addition, the heat pressure in the present invention is higher than the internal pressure in the preheating field because the body flows into the heating field. In addition, the reduction structure in the heating area is provided, so the leakage from the inlet in the preheating area can be suppressed. For example, the heat treatment does not leak hydrogen reducing gas that increases the concentration of the reducing gas in the heating area. Most of the hydrogen at the south price is in vain. [Schematic description] 31469] 2 585926 Fig. 1 is a schematic illustration of a heat treatment furnace according to Embodiment 1 of the present invention. Fig. 2 is a schematic illustration of a heat treatment furnace according to a second embodiment of the present invention. 1 Metal strip 10 Inlet 11 Pre-delivered area 12 Inert gas supply device 13 Indirect heating device 14 Heating area 15 First connection section 16 Reducing gas supply device 17 Indirect heating device 18 Suppression mechanism 19 First cooling area 20 Second connection section 21 2nd cooling area 22 3rd connection part 23 Outlet part 24 Unslot 25 Outlet Ό 26 Inert gas supply device 27 Second suppression mechanism 13 314691