JPH0226925Y2 - - Google Patents
Info
- Publication number
- JPH0226925Y2 JPH0226925Y2 JP19610584U JP19610584U JPH0226925Y2 JP H0226925 Y2 JPH0226925 Y2 JP H0226925Y2 JP 19610584 U JP19610584 U JP 19610584U JP 19610584 U JP19610584 U JP 19610584U JP H0226925 Y2 JPH0226925 Y2 JP H0226925Y2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- refractory
- atmosphere
- dew point
- annealing
- 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
Links
- 239000012298 atmosphere Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 29
- 238000000137 annealing Methods 0.000 description 23
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- 239000007789 gas Substances 0.000 description 13
- 235000011194 food seasoning agent Nutrition 0.000 description 8
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000012299 nitrogen atmosphere Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Furnace Details (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は圧延鋼材を窒素雰囲気で焼鈍するに際
して、炉内雰囲気の露点を低下させる雰囲気炉の
構造に関するものである。
（従来の技術）
炭素鋼や合金鋼の焼鈍は、軟化焼鈍、低温焼
鈍、球状化焼鈍等多くの方法が知られているが、
これらの中で、長時間の高温焼鈍となる球状化焼
鈍は、脱炭防止の面から圧延鋼材を酸洗して、
RXガス（空気とブタンガスを混合し加熱変性し
たもので、たとえばCO≒24％、CO2≒0.5％、H2
≒30％、残りはN2ガスからなるガス）中で雰囲
気焼鈍するのが一般的である。
もともと窒素雰囲気ガス焼鈍は、処理温度が低
いか、あるいは処理時間の短い軟化焼鈍や低温焼
鈍の場合に適用されている程度にすぎなかつた
が、近年省エネルギー、省工程、品質向上が課題
としてりあげられるようになり、球状化焼鈍にお
いても、低温圧延と調整冷却を組合せることで、
熱延鋼材の組織を微細化し、焼鈍時間を短縮する
ことが可能となつた。
従つて球状化焼鈍において、焼鈍炉の雰囲気も
従来のRXガスからN2ガスに切替えることが可能
となり、圧延鋼材の酸洗工程を省略することが実
際に行われるようになつた。しか、冷間鍛造時の
われおよび工具の寿命の面から、一部従来の焼鈍
パターンを適用する必要のあるものがあり、焼鈍
炉の雰囲気は、N2ガスで−50℃以下の露点を実
現させて行うか、又は酸洗RXで行うかのいずれ
かである。
しかし、一つの連続焼鈍炉で雰囲気を変えるこ
とは、シーズニング回数が多くなると共に、１回
当りのシーズニング時間も長くなる。特に、結晶
水の分解を起こしたり、水分を吸脱着するボード
等を使用している炉では、それが炉内に直接露出
していなくても、炉内点検や炉修理時に炉内を大
気開放した後、露点−50℃以下にするには長時間
を要する。
たとえば築炉後数年経過した狼の場合、窒素を
炉内壁表面積１m2当り0.5〜1.0Nm3／Ｈの割合で
供給しても、約45日間のシーズニング時間を必要
とする。また、RXガスから窒素ガス雰囲気に切
替えて、露点を−50℃以下にするのにも５〜10日
間のシーズニング時間を必要とし、焼鈍能力の大
幅低下、燃料原単位の悪化をまねくことになる。
このような問題に対処して本出願人は、先に特
願昭57−150030号明細書（特開昭59−64715号公
報）において、炉内耐火物表面を金属板で覆い、
炉内への供給窒素を炉内側側から炉内耐火物表面
と金属板間に流し、炉内耐火物表面から発生する
水分を、炉内に拡散させることなく、外壁鉄皮と
炉内耐火物を貫通させた排気孔から、炉外に放出
する構造の低露点雰囲気炉を提案した。
これは第４図と、第４図のＡ部を拡大して示し
た第５図に示すごとく、耐火物３の内側を、金属
板１３で覆うこと、及び排気孔６は外壁鉄皮１、
断熱ボード２、耐火物３を貫通させるものであつ
た。
しかし、前記構造の低露点雰囲気炉に使用する
金属板１３には、加工性、耐熱性、耐腐食性等が
要求されるほか、搬送ローラー１７、ラジアント
チユーブ１６、撹拌フアン１９などの周辺への取
付けが困難という問題があつた。
又前記構造の低露点雰囲気炉は、耐火物３に含
まれる水分が多い場合や、耐火物３の目的切れ部
が極端に多く、炉壁部分での発生水分が、耐火物
３の炉内表面にまで拡散してくる場合には有効で
あるが、そうでない場合には、金属板１３がなく
とも、低露点が容易に達成されることが、その後
の調査で判明した。
即ち、水分発生源の大部分が、断熱ボード２の
吸着水分や、結晶水の分解であつて、その炉内側
に水分拡散を防止する耐火物３が、健全な状態に
ある時は、耐火物３が、従来炉の金属板３の役目
をなすためである。このことは第３図に示す炉の
大気開放を想定した耐火物の質量増減に関するラ
ボテスト結果から容易に理解できる。
すなわち、新品の断熱ボードと耐火物につい
て、温度を変化させながら熱天秤でそれぞれの質
量変化を測定すると、断熱ボードには水分の吸脱
着を示す質量増減がみられるが、耐火物にはみら
れない。そして断熱ボードからの水分は、第５図
において、鉄皮１との間隙及び耐火物３との間隙
に多く滞留していることが確認された。
（問題点を解決するための手段）
本考案は上記問題を有利に解決したものであ
る。即ち、本考案は圧延ままの熱延鋼材を、N2
ガス雰囲気下で焼鈍する際に、系中に混在する酸
素や水分を供給N2雰囲気で置換して、露点−50
℃以下を容易に達成せしめ、脱炭現象を防止する
雰囲気炉を、簡便な排気パイプを設けることで実
現し、炉の大気開放から、炉内露点−50℃達成ま
での大幅な時間短縮および焼鈍炉の雰囲気を、
RXからN2にするシーズニング時間を極端に短か
くすることを可能にする雰囲気炉を提供せんとす
るものである。
本考案の要旨は、圧延鋼材を焼鈍するための窒
素雰囲気炉で、炉内側に耐火物、その背後に断熱
ボード等を配置し、外側が鉄皮でおおわれる炉壁
構造において、炉内へ供給された窒素を炉内側か
ら耐火物の膨張代部および目地切れ部に流し、断
熱ボード等から発生する水分を炉内に拡散させる
ことなく、外壁鉄皮と断熱ボードを貫通し、先端
を鉄皮と耐火物間に位置させた排気パイプから、
炉外に放出することで低露点化を図るようにした
雰囲気炉である。
更に効効果的に水分を除くには、耐火物の膨張
代部および目地切れ部を通過するガス流速が、
Ve＜Vn（Vc：水分が炉内へ拡散していく速度、
Vn：炉内から炉外に流れる窒素の通過速度）の
関係を満たすようにして、断熱ボードの高水分ガ
スを、炉内に拡散させることなく、炉外に排出さ
せることで低露点化を達成するものである。
以下図面に基づいて本考案を説明する。
本考案の低露点雰囲気炉の断面図を第１図に示
し、第１図のＢ部拡大図を第２図に示す。
第１図、第２図において、炉の側部及び底部の
鉄皮１と、断熱ボード２を貫通して排気パイプ１
４を設け、その先端が断熱ボード２と、耐火物３
の隙間１１に位置するよう設置する。天井部分
は、被熱処理材２０との接触がないので、セラミ
ツクフアイバーなどの断熱材１２を張り付ける。
従つて排気パイプは設けない。
排気パイプ１４はヘツダー１５に接続し、ヘツ
ダー１５は本音を経由して煙突まで接続する。尚
第１図、第２図において、４は耐火物の膨張代、
５は目地切れ部、７は排出水分、８は炉内窒素、
１６はラジアントチユーブ、１７は被処理鋼材の
搬送ローラー、１８は窒素供給管、１９は撹拌フ
アン、２０は被熱処理材である。
ここで、耐火物３は、その背後にある断熱ボー
ド２から発生する水分が、直接炉内９に拡散する
のを防ぐ役目を果している。従つて、耐火物３は
水分を通過させないレンガなどであればよく、省
エネルギー上熱伝導率の小さい耐火物が望まし
い。排気パイプ１４は、断熱ボード２を耐火物３
の間に滞留している高水分ガスを炉内９に拡散さ
せることなく、炉外１０に排出するために取付け
るものである。
排気パイプ１４の数と径は、炉内への窒素供給
で、炉圧約＋７mmAg以上になるようにして、そ
の先端は水分発生源である断熱ボード２の部分、
すなわち鉄皮１と耐火物３の間に設置すればよい
が、発生水分を炉内９に拡散させることなく確実
に炉外１０に排出させるには、断熱ボード２と耐
火物３の隙間１１にあるのが良い。また、排気パ
イプ１４の取付けは、炉内９へ供給した窒素が、
炉外１０にシヨートパスしないように耐火物３の
膨張代部４、目地切れ部５の位置に、こないよう
に配慮することが大切である。
（考案の効果）
本考案を実施した低露点雰囲気炉において、天
井に設置した窒素供給管１８から、露点−60〜−
70℃の窒素を炉内壁表面積１m2当り約1.0Nm3／
Ｈ供給した場合で、大気開放から炉内露点−50℃
以下にするまでのシーズニング時間は、従来約45
日かかつていたものがわずか3.5日で達成した。
また、露点０℃のRXガスから窒素雰囲気に切
替えて、露点−50℃以下にするシーズニング時間
も、従来の５〜10日かかつていたものが、わずか
0.2〜0.5日で達成した。さらに定常操業の場合で
も、炉の長手方向前後に設けた装入扉および抽出
扉のシール性を強化することで、供給窒素量を従
来の半分にしても、炉圧は７mmAg以上、炉内露
点−50℃以下を安定して確保できるようになり、
第１表に示す如く、焼鈍能力、シーズニング時
間、燃料原単位等を大幅に改善することができ
た。
【表】[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the structure of an atmosphere furnace that lowers the dew point of the atmosphere within the furnace when annealing rolled steel materials in a nitrogen atmosphere. (Prior art) Many methods are known for annealing carbon steel and alloy steel, such as softening annealing, low temperature annealing, and spheroidizing annealing.
Among these, spheroidizing annealing, which involves long-time high-temperature annealing, involves pickling the rolled steel material to prevent decarburization.
RX gas (a mixture of air and butane gas that is heated and denatured; for example, CO≒24%, CO2 ≒0.5%, H2
It is common to perform annealing in an atmosphere (≒30% gas, the rest consisting of N2 gas). Originally, nitrogen atmosphere gas annealing was only applied to softening annealing and low-temperature annealing where the processing temperature is low or the processing time is short, but in recent years energy saving, process saving, and quality improvement have become issues. By combining low-temperature rolling and controlled cooling, even in spheroidizing annealing,
It has become possible to refine the structure of hot rolled steel and shorten the annealing time. Therefore, in spheroidizing annealing, it has become possible to switch the atmosphere in the annealing furnace from the conventional RX gas to N 2 gas, and it has become practical to omit the pickling process of rolled steel materials. However, from the perspective of the life of the cracks and tools during cold forging, there are some cases where it is necessary to apply the conventional annealing pattern, and the atmosphere in the annealing furnace is N2 gas with a dew point of -50℃ or less. This can be done either by drying or by pickling RX. However, changing the atmosphere in one continuous annealing furnace increases the number of times of seasoning and also increases the seasoning time per time. In particular, in furnaces that use boards that cause decomposition of crystallized water or absorb and desorb moisture, the inside of the furnace may be opened to the atmosphere during furnace inspection or furnace repair, even if the board is not directly exposed inside the furnace. After that, it takes a long time to bring the dew point below -50°C. For example, in the case of a furnace that has been in use for several years, even if nitrogen is supplied at a rate of 0.5 to 1.0 Nm 3 /H per 1 m 2 of surface area of the furnace inner wall, about 45 days of seasoning time are required. Additionally, it takes 5 to 10 days of seasoning time to switch from RX gas to nitrogen gas atmosphere and bring the dew point below -50°C, resulting in a significant decrease in annealing capacity and worsening of fuel consumption. . In order to deal with such problems, the present applicant previously proposed in Japanese Patent Application No. 57-150030 (Japanese Unexamined Patent Publication No. 59-64715) that the surface of the refractory in the furnace was covered with a metal plate,
Nitrogen supplied to the furnace flows from the inside of the furnace between the surface of the refractory inside the furnace and the metal plate, and moisture generated from the surface of the refractory inside the furnace is removed from the outer wall steel shell and the refractory inside the furnace without diffusing into the inside of the furnace. We have proposed a low dew point atmosphere furnace with a structure in which dew is discharged to the outside of the furnace through an exhaust hole that penetrates the atmosphere. As shown in FIG. 4 and FIG. 5, which is an enlarged view of part A in FIG.
It penetrated the insulation board 2 and the refractory 3. However, the metal plate 13 used in the low dew point atmosphere furnace with the above structure is required to have workability, heat resistance, corrosion resistance, etc. There was a problem that it was difficult to install. In addition, in a low dew point atmosphere furnace having the above structure, there are cases where the refractory 3 contains a large amount of moisture, or where the refractory 3 has an extremely large number of cut points, and the moisture generated at the furnace wall portion is transferred to the inner surface of the refractory 3. It was found through subsequent research that it is effective when the dew point is diffused to a point where the dew point is diffused, but in other cases, a low dew point can be easily achieved even without the metal plate 13. In other words, most of the moisture generation sources are moisture absorbed by the insulation board 2 and decomposition of crystallized water, and when the refractory 3 that prevents moisture diffusion inside the furnace is in good condition, the refractory 3 serves as the metal plate 3 of the conventional furnace. This can be easily understood from the laboratory test results shown in FIG. 3 regarding the increase and decrease in mass of refractories assuming that the furnace is opened to the atmosphere. In other words, when we measure the mass changes of new insulation boards and refractories using a thermobalance while changing the temperature, we find that the insulation boards show an increase or decrease in mass indicating adsorption and desorption of moisture, but the refractories do not. do not have. It was confirmed in FIG. 5 that a large amount of moisture from the insulation board remained in the gap with the iron skin 1 and the gap with the refractory 3. (Means for solving the problems) The present invention advantageously solves the above problems. That is, in the present invention, as-rolled hot-rolled steel is treated with N 2
When annealing in a gas atmosphere, oxygen and moisture mixed in the system are replaced with a supplied N2 atmosphere to reduce the dew point to -50.
By installing a simple exhaust pipe, we have created an atmosphere furnace that easily achieves temperatures below ℃ and prevents decarburization.This greatly shortens the time from opening the furnace to reaching the dew point inside the furnace to -50℃, and reduces annealing. The atmosphere of the furnace,
It is an object of the present invention to provide an atmospheric furnace that makes it possible to extremely shorten the seasoning time from RX to N2 . The gist of this invention is a nitrogen atmosphere furnace for annealing rolled steel materials, with a refractory inside the furnace, a heat insulating board, etc. placed behind it, and a furnace wall structure where the outside is covered with an iron shell, and the supply is supplied into the furnace. The nitrogen is flowed from the inside of the furnace to the expansion allowance and joints of the refractory, and without dispersing the moisture generated from the insulation board, etc. into the furnace, it penetrates the outer wall steel skin and insulation board, and the tip is inserted into the steel skin. From the exhaust pipe located between the
This is an atmospheric furnace designed to lower the dew point by discharging water outside the furnace. In order to remove moisture more effectively, the gas flow rate through the expansion allowance and joint cuts of the refractory should be
Ve<Vn (Vc: rate at which moisture diffuses into the furnace,
Vn: Passage rate of nitrogen flowing from the inside of the furnace to the outside of the furnace. It is something to do. The present invention will be explained below based on the drawings. A sectional view of the low dew point atmosphere furnace of the present invention is shown in FIG. 1, and an enlarged view of section B in FIG. 1 is shown in FIG. In Figures 1 and 2, an exhaust pipe 1 passes through the iron skin 1 on the side and bottom of the furnace and the insulation board 2.
4, the tip of which is connected to the insulation board 2 and the refractory 3.
It is installed so that it is located in the gap 11 of. Since the ceiling part does not come into contact with the material 20 to be heat treated, a heat insulating material 12 such as ceramic fiber is pasted thereon.
Therefore, no exhaust pipe is provided. The exhaust pipe 14 is connected to a header 15, and the header 15 is connected to the chimney via the main pipe. In Figures 1 and 2, 4 is the expansion allowance of the refractory;
5 is the joint break, 7 is the discharged moisture, 8 is the nitrogen in the furnace,
16 is a radiant tube, 17 is a conveyance roller for the steel material to be treated, 18 is a nitrogen supply pipe, 19 is a stirring fan, and 20 is a material to be heat treated. Here, the refractory 3 serves to prevent moisture generated from the insulation board 2 behind it from directly diffusing into the furnace interior 9. Therefore, the refractory 3 may be any material such as brick that does not allow moisture to pass through, and from the viewpoint of energy saving, a refractory with low thermal conductivity is desirable. The exhaust pipe 14 connects the insulation board 2 to the refractory material 3.
This is installed in order to discharge the high moisture gas remaining in the furnace outside the furnace 10 without diffusing it into the inside 9 of the furnace. The number and diameter of the exhaust pipes 14 are such that nitrogen is supplied into the furnace so that the furnace pressure is approximately +7 mmAg or more, and the tips of the exhaust pipes 14 are connected to the insulation board 2, which is the source of moisture, and
In other words, it can be installed between the iron skin 1 and the refractory 3, but in order to ensure that the generated moisture is discharged outside the furnace 10 without diffusing into the inside 9 of the furnace, it is necessary to install it in the gap 11 between the insulation board 2 and the refractory 3. It's good to have one. In addition, the installation of the exhaust pipe 14 ensures that the nitrogen supplied to the inside of the furnace 9 is
It is important to pay attention to the positions of the expansion allowance 4 and the joint break 5 of the refractory 3 so that they do not pass outside the furnace 10. (Effects of the invention) In the low dew point atmosphere furnace in which the invention is implemented, nitrogen is supplied from the nitrogen supply pipe 18 installed on the ceiling at a dew point of -60 to -
Approximately 1.0Nm 3 / 70℃ nitrogen per 1m 2 of furnace inner wall surface area
When H is supplied, the dew point inside the furnace is -50℃ from open to atmosphere.
Traditionally, the seasoning time to achieve the following is approximately 45
What used to take days was achieved in just 3.5 days. In addition, the seasoning time required to switch from RX gas with a dew point of 0°C to a nitrogen atmosphere and bring the dew point to below -50°C is now just 5 to 10 days.
Achieved in 0.2 to 0.5 days. Furthermore, even during steady operation, by strengthening the sealing properties of the charging and extraction doors installed at the front and rear of the furnace in the longitudinal direction, even if the amount of nitrogen supplied is reduced to half of the conventional amount, the furnace pressure remains at 7 mmAg or more, and the dew point inside the furnace It is now possible to stably maintain temperatures below -50℃,
As shown in Table 1, it was possible to significantly improve annealing capacity, seasoning time, fuel consumption, etc. 【table】
第１図は本考案低露点雰囲気の断面図、第２図
は第１図のＢ部拡大図、第３図は大気開放を想定
した時の耐火物断熱ボードへの水分吸脱着を示す
温度と質量変化の関係図、第４図は従来の雰囲気
炉の断面図、第５図は第４図のＡ部拡大図であ
る。
１……鉄皮、２……断熱ボード、３……耐火
物、４……膨張代、５……目地切れ部、６……排
気孔、７……排出水分、８……炉内窒素、９……
炉内、１０……炉外、１１……隙間、１２……断
熱材、１３……金属板、１４……排出パイプ、１
５……ヘツダー、１６……ラジアントチユーブ、
１７……搬送ローラ、１８……窒素供給管、１９
……撹拌フアン、２０……被熱処理材。
Figure 1 is a cross-sectional view of the low dew point atmosphere of the present invention, Figure 2 is an enlarged view of part B in Figure 1, and Figure 3 shows the temperature and adsorption and desorption of moisture on the refractory insulation board when it is assumed to be open to the atmosphere. A relationship diagram of mass change, FIG. 4 is a sectional view of a conventional atmosphere furnace, and FIG. 5 is an enlarged view of section A in FIG. 4. 1... Iron shell, 2... Insulation board, 3... Refractory, 4... Expansion allowance, 5... Joint cut, 6... Exhaust hole, 7... Exhaust moisture, 8... Furnace nitrogen, 9...
Inside the furnace, 10...Outside the furnace, 11...Gap, 12...Insulating material, 13...Metal plate, 14...Exhaust pipe, 1
5... Header, 16... Radiant tube,
17... Conveyance roller, 18... Nitrogen supply pipe, 19
... Stirring fan, 20 ... Material to be heat treated.
Claims (1)
炉内側に耐火物、その背後に断熱ボードを配置
し、外側が鉄皮でおおわれる炉壁構造において、
外鉄皮から炉内方向に複数の排気パイプを、鉄
皮、断熱ボードを貫通して設け、該排気パイプの
先端を、鉄皮と耐火物間に位置させて構成したこ
とを特徴とする排気パイプ付低露点雰囲気炉。 An atmospheric furnace for heat treating steel materials after rolling.
In a furnace wall structure in which refractories are placed inside the furnace, an insulation board is placed behind it, and the outside is covered with an iron shell,
An exhaust system characterized in that a plurality of exhaust pipes are provided from the outer shell toward the inside of the furnace, penetrating the steel shell and the insulation board, and the tips of the exhaust pipes are positioned between the steel shell and the refractory. Low dew point atmosphere furnace with pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19610584U JPH0226925Y2 (en) | 1984-12-26 | 1984-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19610584U JPH0226925Y2 (en) | 1984-12-26 | 1984-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61111962U JPS61111962U (en) | 1986-07-15 |
| JPH0226925Y2 true JPH0226925Y2 (en) | 1990-07-20 |
Family
ID=30753753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19610584U Expired JPH0226925Y2 (en) | 1984-12-26 | 1984-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226925Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2683033B2 (en) * | 1988-05-13 | 1997-11-26 | 川崎製鉄株式会社 | Structure of heat treatment furnace wall |
| JP5463768B2 (en) * | 2009-07-13 | 2014-04-09 | Ｊｆｅスチール株式会社 | How to install the sensor in the heating furnace |
| JP5463767B2 (en) * | 2009-07-13 | 2014-04-09 | Ｊｆｅスチール株式会社 | How to install a heater in a heating furnace |
-
1984
- 1984-12-26 JP JP19610584U patent/JPH0226925Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61111962U (en) | 1986-07-15 |
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