JPH0417626A - Method for controlling atmosphere gas for batch annealing furnace - Google Patents
Method for controlling atmosphere gas for batch annealing furnaceInfo
- Publication number
- JPH0417626A JPH0417626A JP12232890A JP12232890A JPH0417626A JP H0417626 A JPH0417626 A JP H0417626A JP 12232890 A JP12232890 A JP 12232890A JP 12232890 A JP12232890 A JP 12232890A JP H0417626 A JPH0417626 A JP H0417626A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- atmosphere gas
- annealing
- atmospheric gas
- atmosphere
- 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
- 238000000137 annealing Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims description 17
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 11
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 71
- 238000010438 heat treatment Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、雰囲気ガスの再利用を図るバッチ式焼鈍炉に
おける雰囲気ガス制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an atmospheric gas control method in a batch annealing furnace that aims to reuse atmospheric gas.
〔従来の技術］
従来より、材料表面のｉ化、窒化、脱炭等が許されない
焼鈍を行う場合（−は、Ｎ、、ＡＸ （アンモニア分解
ガス）、Ｈ２５，へｒ等を雰囲気ガスとし７て用いる間
接加熱方式すた（す電気加熱方−り・・′ッチ式焼鈍炉
が多用されている。この方式の焼鈍炉では、炉内または
マンフル内に雰囲気ガスを導入しながら所定の加熱冷却
が行われる。導入された雰囲気ガスは、炉内またはマン
フル内の圧力を一定に保ちながら放散管を通して逐一大
気放散される。[Prior art] Conventionally, when performing annealing that does not allow i-hardening, nitriding, decarburization, etc. of the material surface (- means N, AX (ammonia decomposition gas), H25, Herr, etc. as the atmospheric gas7). An indirect heating method (electric heating method) is often used.In this type of annealing furnace, the specified heating is performed while introducing atmospheric gas into the furnace or manifold. Cooling is performed.The introduced atmospheric gas is gradually released into the atmosphere through a diffusion tube while keeping the pressure in the furnace or mantle constant.
〔発明が解決しようとする課題］
ここで使用される雰囲気ガスは、最近は、焼鈍材の高級
化、表面清浄度の向上に対する要望に伴い、高純度なも
のに切り替わっている。そのため、高純度な雰囲気ガス
の大気放散に伴う焼鈍コストの上昇が大きな問題になっ
てきている。[Problems to be Solved by the Invention] Recently, the atmospheric gas used here has been switched to a high-purity gas due to the demand for higher quality annealing materials and improved surface cleanliness. Therefore, an increase in annealing cost due to the release of high-purity atmospheric gas into the atmosphere has become a major problem.
高純度ガスを雰囲気ガスとして使用する間接加熱方式ま
たは電気加熱方式のバッチ式焼鈍炉でのガス節減対策と
しては、雰囲気ガスが可燃性ガスの場合にそのガスの一
部を炉内に直接またはバーナを介して吹き込んで燃焼放
散させることが行われている。しかしながら、この対策
は、雰囲気ガスが不燃性ガスの場合には採用できないだ
けでなく、採用が可能な場合にあっても回収できる熱量
はわずかであり、放散雰囲気ガスの単価ムこ見合う効果
を挙げるには至っていない。As a measure to save gas in an indirect heating type or electric heating type batch type annealing furnace that uses high-purity gas as the atmosphere gas, if the atmosphere gas is a flammable gas, some of the gas can be pumped directly into the furnace or through a burner. This is done by blowing it in through the air to burn and dissipate it. However, this measure cannot be adopted when the atmospheric gas is nonflammable, and even if it is possible, the amount of heat that can be recovered is small, and the effect is not worth the unit price of the diffused atmospheric gas. This has not yet been achieved.
また、雰囲気ガスが発熱型ガスと吸熱型ガスとの混合ガ
スの場合に、炉内から排出される雰囲気ガスに炭化水素
系燃料と空気とを添加し、燃焼により雰囲気ガスを再生
して炉内に再供給する方法が、特開昭５８−１１７８２
２号公報に開示されているが、雰囲気ガスとして高純度
の単一ガスを使用する間接加熱方式または電気加熱方式
のバッチ式焼鈍炉にこの方法が採用できないことは言う
までもない。In addition, when the atmospheric gas is a mixture of exothermic gas and endothermic gas, hydrocarbon fuel and air are added to the atmospheric gas discharged from the furnace, and the atmospheric gas is regenerated by combustion. A method of resupplying the
Although this method is disclosed in Publication No. 2, it goes without saying that this method cannot be applied to an indirect heating type or electric heating type batch type annealing furnace that uses a single high-purity gas as an atmosphere gas.
本発明の目的は、可燃性、不燃性を問わず、高純度の雰
囲気ガスが使用される場合に顕著なガス節減効果が得ら
れ、しかも品質低下の懸念がないバッチ焼鈍炉における
雰囲気ガス制御方法を提供することにある。An object of the present invention is to provide a method for controlling atmospheric gas in a batch annealing furnace, which achieves a remarkable gas saving effect when a high-purity atmospheric gas is used, regardless of whether it is flammable or non-flammable, and which eliminates the risk of quality deterioration. Our goal is to provide the following.
本発明の雰囲気ガス制御方法は、雰囲気調整を行うバッ
チ焼鈍炉において、雰囲気ガスの排出系路で雰囲気ガス
の不純物濃度および露点を検出し、これらの検出値が予
め設定した基準値以下になった時点で、雰囲気ガスの排
出系路から供給系路へ雰囲気ガスの一部を還流させるこ
とを特徴としてなる。The atmospheric gas control method of the present invention detects the impurity concentration and dew point of the atmospheric gas in the atmospheric gas exhaust system in a batch annealing furnace that performs atmosphere adjustment, and detects the impurity concentration and dew point of the atmospheric gas when these detected values become below a preset reference value. At this point, a part of the atmospheric gas is recirculated from the atmospheric gas exhaust line to the supply line.
（作 用〕
高純度の雰囲気ガスを使用してバッチ焼鈍を行う場合、
炉から排出される雰囲気ガスは、焼鈍当初は多量の不純
物を含むが、焼鈍の進行につれて不純物量が減少し、再
使用可能な純度、品質に達する０本発明の雰囲気ガス制
御方法は、炉から排出される雰囲気ガスの不純度濃度お
よび露点から、そのガスが再使用可能か否かを判断し、
再使用が可能になった時点より、そのガスの一部または
全部を雰囲気ガスとして再使用するものである。(Function) When performing batch annealing using high-purity atmospheric gas,
The atmospheric gas discharged from the furnace contains a large amount of impurities at the beginning of annealing, but as the annealing progresses, the amount of impurities decreases and reaches a purity and quality that can be reused. Based on the impurity concentration and dew point of the exhausted atmospheric gas, it is determined whether the gas can be reused or not.
From the point at which reuse becomes possible, part or all of the gas is reused as atmospheric gas.
このとき、雰囲気ガスの露点を検出するのは、雰囲気中
の不純物の１つである水薫気の分圧を露点値に代用して
検出するためである。At this time, the dew point of the atmospheric gas is detected by substituting the partial pressure of water smoke, which is one of the impurities in the atmosphere, for the dew point value.
本発明のガス制御方法では、雰囲気ガスの再使用により
ガス原単位の低減が可能になると共に、雰囲気ガスの再
使用に伴う焼鈍材の品質低下の懸念がない。また、炉か
ら排出される雰囲気ガスの不純物濃度が低下した段階で
は、雰囲気ガスの供給量を絞ることによってガス原単位
を改善できるが、その場合には、炉内圧力の低下が生し
、炉内に外気が吸収されて着色欠陥等を生しる０本発明
の雰囲気ガス制御方法では、ガスｉ！ｉ減が実施された
以降も炉内圧力低下の懸念がないだけでなく、炉内への
雰囲気ガス供給量を増すことができ、炉内圧力確保によ
る品質保証も可能になる。In the gas control method of the present invention, the gas consumption rate can be reduced by reusing the atmospheric gas, and there is no concern that the quality of the annealed material will deteriorate due to the reuse of the atmospheric gas. In addition, at the stage when the impurity concentration of the atmospheric gas discharged from the furnace has decreased, the gas consumption rate can be improved by reducing the supply amount of atmospheric gas, but in that case, the pressure inside the furnace will decrease and the In the atmospheric gas control method of the present invention, the gas i! Not only is there no concern that the pressure inside the furnace will drop even after the i-reduction is implemented, but the amount of atmospheric gas supplied to the inside of the furnace can be increased, and quality assurance can be achieved by ensuring the pressure inside the furnace.
以下に本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は本発明法の実施に適した焼鈍設備のガス系統図
、第２図はその焼鈍設備における焼鈍炉の構造を示す断
面図である。FIG. 1 is a gas system diagram of an annealing equipment suitable for implementing the method of the present invention, and FIG. 2 is a sectional view showing the structure of an annealing furnace in the annealing equipment.
焼鈍設備は純水素を使用したコイル焼鈍設備であって、
第１図に示すように１０基のパンチ焼鈍炉ｌＯを備えて
いる。各バッチ焼鈍炉１０には、逆止弁２０が介設され
た供給系路３ｏを通して雰囲気ガスが供給される。各バ
ッチ焼鈍炉ｌＯに供給された雰囲気ガスは、排出系路４
０の支管および本管を通して大気放散される一方、排出
系路４０の支管途中より分岐する回収系路５０の支管と
、これに続く本管とを通して供給系路３０へ送られるよ
うになっている。The annealing equipment is a coil annealing equipment that uses pure hydrogen,
As shown in FIG. 1, ten punch annealing furnaces IO are provided. Atmospheric gas is supplied to each batch annealing furnace 10 through a supply line 3o in which a check valve 20 is provided. The atmospheric gas supplied to each batch annealing furnace IO is discharged through the exhaust system 4.
0 to the atmosphere through the branch pipe and the main pipe, while being sent to the supply system line 30 through the branch pipe of the recovery line 50 that branches from the middle of the branch line of the discharge line 40 and the main line following this. .
回収系路５０が分岐する排出系路４０支管上の分岐点よ
り上流側には、０□濃度計、Ｎ２濃度計、露点計等の計
器６０が設けられ、下流側には放散弁７０が介装されて
いる。また、回収系路５０の各支管には回収弁８０が介
装され、その本管には回収用昇圧機９０が介装されてい
る。そして、放散弁７０および回収弁８０は、計器６０
の出力に基づいて制御器１００により開度制御される。Instruments 60 such as a 0□ concentration meter, a N2 concentration meter, and a dew point meter are provided on the upstream side of the branch point on the discharge system path 40 branch pipe where the recovery system path 50 branches, and a discharge valve 70 is provided on the downstream side. equipped. Further, a recovery valve 80 is installed in each branch pipe of the recovery system 50, and a recovery booster 90 is installed in the main pipe. The discharge valve 70 and the recovery valve 80 are connected to the meter 60.
The opening degree is controlled by the controller 100 based on the output.
焼鈍設備における各バッチ炉焼鈍炉ｌＯは、第２図に示
すように、いわゆるベル型の間接加熱方式炉であって、
ベース１１上にコイルｌを、コンベクターと呼ばれる通
気用の仕切り１２を挟んで段積みし、その外側にインナ
ーカバー１３と、更に加熱ベル１４又は冷却ベル１５を
かぶせ、コイル１を所定の温度パターンで加熱及び冷却
し、熱処理を行うようになっている。Each batch furnace annealing furnace IO in the annealing equipment is a so-called bell-shaped indirect heating furnace, as shown in FIG.
Coils 1 are stacked on a base 11 with ventilation partitions 12 called convectors in between, and an inner cover 13 and a heating bell 14 or cooling bell 15 are placed on the outside of the coils 1 to keep the coils 1 in a predetermined temperature pattern. Heat treatment is performed by heating and cooling.
すなわち、加熱ベル１４には周方向４本で上下方向３段
の計１２本のバーナ１６が設置されており、各バーナ１
６によりインナーカバー１３を介してコイル１を加熱す
る。冷却ベル１５の上部には空冷ファン１７と水スプレ
ー１８が設置されており、これらでインナーカバー１３
を空冷または水冷することにより、インナーカバー１３
内のコイルｌを冷却する。インナーカバー１３とベース
１１のシール部は０リング１３’にてインナーカバー１
３内を密閉する構造となっている。That is, a total of 12 burners 16 are installed on the heating bell 14, four in the circumferential direction and three in the vertical direction.
6 heats the coil 1 via the inner cover 13. An air cooling fan 17 and a water spray 18 are installed on the top of the cooling bell 15, and these cool the inner cover 13.
The inner cover 13 is cooled by air or water cooling.
Cool the coil l inside. The sealing part between the inner cover 13 and the base 11 is attached to the inner cover 1 with an O ring 13'.
3 has a structure that seals the inside.
雰囲気ガスは、供給系路３０の支管を通じてベース１１
下部より、インナーカバー１３内に導入され、ベース内
部に収められたＲＣファン１９にてインナーカバー１３
内を循環し、インナーカバー１３（７）内圧を一定値（
４００〜１０ （１ｍ＋Ｈｚ Ｏ）に保ちながら、排出
系路４０の支管および本管を通して大気放散される。１
９′はＲＣファンモータである。Atmospheric gas is supplied to the base 11 through a branch pipe of the supply line 30.
The RC fan 19 is introduced into the inner cover 13 from the bottom and housed inside the base, and the inner cover 13 is
The internal pressure of the inner cover 13 (7) is maintained at a constant value (
400-10 (1 m+Hz O), and is vented to the atmosphere through the branch and main pipes of the exhaust line 40. 1
9' is an RC fan motor.
本発明の雰囲気ガス制御方法は、上記焼鈍設備において
次のように実施される。The atmospheric gas control method of the present invention is carried out in the annealing equipment as follows.
焼鈍中に計器６０において、ハツチ焼鈍炉ｌＯより排出
される雰囲気ガスの０□濃度、Ｎ、ｆＡ度を高速ガスク
ロマトグラフィー等により検出する共に、その露点を１
段式酸化アルミ被膜検出方式等を用いた露点計により検
出する。During annealing, the instrument 60 detects the 0□ concentration, N, and fA degrees of the atmospheric gas discharged from the Hatch annealing furnace lO by high-speed gas chromatography, etc., and also detects its dew point at 1
Detected using a dew point meter using a step-type aluminum oxide film detection method.
制御器１００は、バッチ焼鈍炉ｌＯより排出される雰囲
気ガスが再使用可能になる０！濃度、Ｎ。The controller 100 allows the atmospheric gas discharged from the batch annealing furnace IO to be reused! Concentration, N.
濃度および露点を記憶しており、検出された各データの
いずれもがその記憶データ以下になった時点で放散弁７
０を全開から所定開度まで閉じ、回収弁８０を全開から
所定開度まで開放する。こうすることにより、焼鈍の途
中より使用済の雰囲気ガスの一部又は全部がバッチ焼鈍
炉ｌＯに再供給されるようになり、その再供給に見合う
量だけ新規供給量が節約される。The concentration and dew point are memorized, and the release valve 7 is activated when each of the detected data becomes less than the stored data.
0 is closed from fully open to a predetermined opening degree, and the recovery valve 80 is opened from fully open to a predetermined opening degree. By doing this, part or all of the used atmospheric gas is re-supplied to the batch annealing furnace 10 during annealing, and the amount of new supply is saved by an amount commensurate with the re-supply.
挿入最大重量が１００７ｏｎ／ｃｈ、装入寸法が２００
０ｍ径Ｘ４３００■高さのバッチ焼鈍炉ｌＯで第３図に
示すパターンにより雰囲気ガス制御を実施したところ、
雰囲気ガスである純水素の原単位が従来１゜２Ｎｒ＋（
／Ｔｏｎであったものが、約０．６Ｎｒｒｆ／Ｔｏｎに
半減できた。また、雰囲気ガスの再使用に伴う焼鈍品質
の低下は生しなかった。さらに、雰囲気ガスの再使用中
もインナーカバー内圧が所定値に維持されたために、大
気侵入による着色欠陥も生じなかった。Maximum insertion weight is 1007 on/ch, charging size is 200
When atmospheric gas control was carried out in a batch annealing furnace IO with a diameter of 0 m and a height of 4300 m, according to the pattern shown in Fig. 3,
Conventionally, the basic unit of pure hydrogen, which is an atmospheric gas, was 1゜2Nr+(
/Ton was reduced by half to approximately 0.6Nrrf/Ton. Further, there was no deterioration in annealing quality due to reuse of atmospheric gas. Furthermore, since the inner cover internal pressure was maintained at a predetermined value even while the atmospheric gas was being reused, no coloring defects occurred due to atmospheric intrusion.
上記実施例は各炉にそれぞれ計器６０を設けたが、各炉
間で計器を共用して切り替えにより、各炉より排出され
る雰囲気ガスの不純物濃度および露点を検出するように
してもよい。また、回収系路にフィルター、水素分離膜
等を介装することも可能である。In the above embodiment, each furnace is provided with a meter 60, but the meter may be shared among the furnaces and switched to detect the impurity concentration and dew point of the atmospheric gas discharged from each furnace. It is also possible to interpose a filter, hydrogen separation membrane, etc. in the recovery line.
更に、雰囲気ガスが純水素以外のバッチ焼鈍に本発明を
適用することもでき、焼鈍対象材もコイルに限らない。Furthermore, the present invention can also be applied to batch annealing in which the atmospheric gas is other than pure hydrogen, and the material to be annealed is not limited to coils.
（発明の効果〕
以上の説明から明らかなように、本発明の雰囲気ガス制
御方法は、焼鈍炉から排出される雰囲気ガスをそのまま
焼鈍炉に還流させるので、雰囲気ガスの種々を問わずガ
ス原単位の低減が可能になる。しかも、雰囲気ガスを大
量に還流させる場合にあっても、還流による焼鈍品質の
低下が阻止されると共に、供給ガス量の低下による品質
低下が阻止される。従って、優れた焼鈍品質を維持しつ
つ焼鈍コストの大幅節減が達成される。(Effects of the Invention) As is clear from the above explanation, the atmospheric gas control method of the present invention allows the atmospheric gas discharged from the annealing furnace to flow back into the annealing furnace as it is, so regardless of the type of atmospheric gas, the gas consumption rate is Furthermore, even when a large amount of atmospheric gas is refluxed, deterioration in annealing quality due to reflux is prevented, and deterioration in quality due to a decrease in the amount of supplied gas is prevented. Significant reductions in annealing costs can be achieved while maintaining annealing quality.
第１図は本発明法の実施に適した焼鈍設備のガス系統図
、第２図はその焼鈍設備におけるバッチ炉焼鈍の断面図
、第３図は本発明法における雰囲気ガスの供給パターン
例を示すタイムチャートである。
１０；バッチ焼鈍炉、３０：供給系路、４０：排出系路
、５０：回収系路、６０：計器、７０：放散弁、８０：
回収弁。Fig. 1 shows a gas system diagram of an annealing equipment suitable for carrying out the method of the present invention, Fig. 2 shows a cross-sectional view of batch furnace annealing in the annealing equipment, and Fig. 3 shows an example of the atmospheric gas supply pattern in the method of the present invention. This is a time chart. 10: Batch annealing furnace, 30: Supply system path, 40: Discharge system path, 50: Recovery system path, 60: Instrument, 70: Diffusion valve, 80:
recovery valve.
Claims (1)
ガスの排出系路で雰囲気ガスの不純物濃度および露点を
検出し、これらの検出値が予め設定した基準値以下にな
った時点で、雰囲気ガスの排出系路から供給系路へ雰囲
気ガスの一部または全部を還流させることを特徴とする
バッチ焼鈍炉における雰囲気ガス制御方法。(1) In a batch annealing furnace that performs atmosphere adjustment, the impurity concentration and dew point of the atmospheric gas are detected in the atmospheric gas exhaust system, and when these detected values become below the preset reference value, the atmospheric gas is A method for controlling atmospheric gas in a batch annealing furnace, characterized in that part or all of atmospheric gas is refluxed from a discharge system to a supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12232890A JPH0417626A (en) | 1990-05-11 | 1990-05-11 | Method for controlling atmosphere gas for batch annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12232890A JPH0417626A (en) | 1990-05-11 | 1990-05-11 | Method for controlling atmosphere gas for batch annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0417626A true JPH0417626A (en) | 1992-01-22 |
Family
ID=14833252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12232890A Pending JPH0417626A (en) | 1990-05-11 | 1990-05-11 | Method for controlling atmosphere gas for batch annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0417626A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008540833A (en) * | 2005-05-12 | 2008-11-20 | エープナー インドゥストリーオーフェンバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method of heat-treating annealed parts in batch operation |
-
1990
- 1990-05-11 JP JP12232890A patent/JPH0417626A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008540833A (en) * | 2005-05-12 | 2008-11-20 | エープナー インドゥストリーオーフェンバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method of heat-treating annealed parts in batch operation |
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