JPS58189318A - Electric heating type heat treatment furnace - Google Patents
Electric heating type heat treatment furnaceInfo
- Publication number
- JPS58189318A JPS58189318A JP7227382A JP7227382A JPS58189318A JP S58189318 A JPS58189318 A JP S58189318A JP 7227382 A JP7227382 A JP 7227382A JP 7227382 A JP7227382 A JP 7227382A JP S58189318 A JPS58189318 A JP S58189318A
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- tubes
- heat insulating
- heat
- furnace
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Furnace Details (AREA)
Abstract
Description
【発明の詳細な説明】
この発明はヒータチューブの寿命を延長できるようにし
た電熱式熱処理炉に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric heat treatment furnace that can extend the life of a heater tube.
一般に電熱式熱処理炉は、被処理物を炉室内に装入し、
これを雰囲気ガス中において電気ヒータで所定温度に加
熱保持したり、加熱後焼入、焼戻し等したりして被処理
物の材質調整を行なうものである。ところでガス浸炭処
理を行なう場合のように炉室内膠こ変成ガスを入れ、炉
室内を還元性雰囲気にして熱処理を行なうと、ヒータチ
ューブ等に使用されているステンレス鋼には、その温度
が６００〜７２０°Ｃになると雰囲気ガス中の水素がス
テンレス鋼中に拡散して該ステンレス鋼のクロムとニッ
ケル、鉄等との結合力を弱めクロムを脆くする、いわゆ
る水素脆性が生じ、これによって雰囲気ガス中の炭素、
酸素がステンレス鋼のクロム。Generally, in an electric heat treatment furnace, the material to be treated is charged into the furnace chamber.
This is heated and maintained at a predetermined temperature with an electric heater in an atmospheric gas, or is quenched, tempered, etc. after heating to adjust the material quality of the workpiece. By the way, when heat treatment is performed by introducing glue-converted gas into the furnace chamber and creating a reducing atmosphere in the furnace chamber, as in the case of gas carburizing treatment, the temperature of the stainless steel used for heater tubes etc. When the temperature reaches 720°C, hydrogen in the atmospheric gas diffuses into the stainless steel, weakening the bond between chromium, nickel, iron, etc. in the stainless steel, and making the chromium brittle, resulting in so-called hydrogen embrittlement. carbon,
Oxygen is stainless steel chromium.
鉄と化合して結晶粒界にクロム、鉄の酸化物、複合炭化
物が析出し、その結果金塊イオンに電位差が生じ、ステ
ンレス鋼は電解腐食によって腐食し易くなる。また上記
雰曲気ガス中の炭素がステンレス鋼の表面に拡散してそ
の表面の炭素濃度が増し、表面と内部とに組織変化が生
じる。いわゆるカーボンアタックによっても上記ステン
レス鋼は腐食し易（なり、このような腐食によって熱処
理炉内に使用されているヒータチューブ等の寿命が短く
なってしまうという問題があった◎また被処理物を加熱
後ソルト焼入れするような場合は、ソルトがトレイに付
着して熱処理炉内に持ち込まれるが、該ソルトは高温に
なると分解して酸素を発生し、該酸素が上記腐食を促進
してしまうものであった。またヒータチューブ等の材質
を上記腐食に強い材質のものに変更してヒータチューブ
等の寿命の向上を図ろうとすると、高品質のステンレス
鋼を使用せざるを得す、コスト高になってしまうという
問題があった。When combined with iron, chromium, iron oxides, and composite carbides precipitate at grain boundaries, resulting in a potential difference between gold nugget ions, making stainless steel susceptible to electrolytic corrosion. Furthermore, carbon in the atmospheric gas diffuses onto the surface of the stainless steel, increasing the carbon concentration on the surface and causing structural changes on the surface and inside. The stainless steel mentioned above is also susceptible to corrosion due to so-called carbon attack, and this corrosion has the problem of shortening the lifespan of heater tubes used in heat treatment furnaces. In the case of post-salt quenching, salt adheres to the tray and is brought into the heat treatment furnace, but the salt decomposes at high temperatures and generates oxygen, which accelerates the corrosion described above. In addition, if you try to extend the life of the heater tube by changing the material of the heater tube to one that is resistant to corrosion, you will have to use high-quality stainless steel, which will increase the cost. There was a problem with this.
本発明はこのような従来のものの問題点に鑑みてなされ
たもので、断熱層に嵌挿されて腐准し易い温度になって
いる部分のヒータチューブ外表面に耐熱窓よび耐食性の
あるセラミック被覆を形成することによって、ヒータチ
ューブの寿命を延長できるようにした電熱式熱処理炉を
提供することを目的としている。The present invention has been made in view of the problems of the conventional ones, and includes a heat-resistant window and a corrosion-resistant ceramic coating on the outer surface of the heater tube in the part that is inserted into the heat insulating layer and is at a temperature that is susceptible to corrosion. An object of the present invention is to provide an electric heat treatment furnace that can extend the life of a heater tube by forming a heater tube.
以下本発明の実施例を図について説明する。Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の第１の実施例を示し、図において１は
断熱線瓦等の断熱材で形成され、炉長方向（第１図紙面
垂直方向）に長い円筒状の断熱層であり、該断熱層１は
支持部材２によって床面３上に据付けられている。また
上記断熱層１で囲まれた空間は炉室４になっており、該
炉室４は水素。FIG. 1 shows a first embodiment of the present invention, and in the figure, 1 is a cylindrical heat insulating layer made of a heat insulating material such as a heat insulating wire tile and long in the furnace length direction (perpendicular to the plane of the paper in FIG. 1). , the heat insulating layer 1 is installed on a floor surface 3 by means of a support member 2. The space surrounded by the heat insulating layer 1 is a furnace chamber 4, and the furnace chamber 4 is filled with hydrogen.
−酸化炭素、音素等からなる変成ガスで充満されて還元
性Ｂ囲気になっており、該雰囲気の温度は９１０°Ｃに
保持されている。また上記断熱層１の炉床部１翼上面に
は炉長方向に長い２本のレール５が上方に突設されてお
り、該レール５上にはトレイ６に載置された被処理物７
が配設されている。- It is filled with a metamorphosed gas consisting of carbon oxide, phonemes, etc., creating a reducing B atmosphere, and the temperature of the atmosphere is maintained at 910°C. Further, on the upper surface of the hearth part 1 blade of the heat insulating layer 1, two rails 5 which are long in the furnace length direction are provided to protrude upward.
is installed.
また上記断熱層１の側壁部１ｂにはステンレス鋼からな
り炉室４内の雰囲気ガスを採取するサンプリングチュー
ブ８が該側壁部１ｂを嵌挿して取付けられており、また
天井部ＩＣにはその軸９λ１羽根９ｂがステンレス鋼で
形成され、炉室４内の雰囲気ガスを攪拌する攪拌ファン
９が上記天井部１ｃｍｔ−嵌挿して取付けられている〇
また上記断熱層１の天井部ＩＣと側壁部１ｂとの境界付
近には、上方からこれを貫通して炉室４内に突出する左
右２列のヒータチューブ１０が炉長方向に沿って多数配
役されており、該ヒータチューブ１０の内部にはニクロ
ム線等からなる電気ヒータ１１が収容されている。また
上記ヒータチュー１１０の上記断熱層１に嵌挿されてい
る部分１０ｍ の中央付近外表面の温度は約６００〜
７．２♂Ｃになっており、このような温度領域にあるス
テンレス鋼は上述の水素脆性やカーボンアタックによっ
て腐令しやすいものとなっている。そして上記ヒータチ
ューブ１０の嵌挿部分１０亀の外表面にはセラミックフ
ァイバー１２が無機質のバインダーで接着され、セラミ
ック被覆が形成されている。Further, a sampling tube 8 made of stainless steel and used to sample atmospheric gas in the furnace chamber 4 is attached to the side wall portion 1b of the heat insulating layer 1 by fitting into the side wall portion 1b, and its shaft is attached to the ceiling IC. 9λ1 blades 9b are made of stainless steel, and a stirring fan 9 for stirring the atmospheric gas in the furnace chamber 4 is attached to the ceiling by fitting 1 cm into the ceiling IC and the side wall 1b of the heat insulating layer 1. A large number of heater tubes 10 in two rows on the left and right are arranged along the furnace length direction, penetrating the heater tubes 10 from above and projecting into the furnace chamber 4. An electric heater 11 made of wire or the like is housed. Further, the temperature of the outer surface near the center of the 10 m portion of the heater chew 110 fitted into the heat insulating layer 1 is about 600~
The temperature is 7.2♂C, and stainless steel in this temperature range is prone to rot due to the hydrogen embrittlement and carbon attack described above. Ceramic fibers 12 are bonded to the outer surface of the fitting portion 10 of the heater tube 10 using an inorganic binder to form a ceramic coating.
なお上記セラミックファイバー１２はアルミナ粉末およ
び二酸化シリコン（シリカ）粉末に酸化クロム粉末を添
加剤とじて混合し、これを電気溶解して繊維状に形成し
たものであり、また上記バインダーはアルミナ粉末、シ
リカ粉末！酸化クロム粉末およびシャモット（練瓦）粉
末とアルカリ成分の少ない硬化剤とを混練したものであ
る。The ceramic fiber 12 is made by mixing alumina powder and silicon dioxide (silica) powder with chromium oxide powder as an additive, and electrolytizing the mixture to form a fiber, and the binder is made of alumina powder, silica powder, etc. Powder! This product is made by kneading chromium oxide powder, chamotte powder, and a hardening agent with a low alkaline content.
このように本実施例の電熱式熱処理炉では、ヒータチュ
ー７’ １０の断熱層ｌに嵌挿されて腐食し易い温度に
なっている部分１０３の外表面にセラミックファイバー
１２をバインダーで接着してセラζツク被覆を形成した
ので、・炉室４内の雰囲気ガスがヒータチューブ１０の
嵌挿部分ｔＯａに直接接触することはなく、該ヒータチ
ューブｌＯが腐食するのを防止できる〇
なお、上記第１の実施例！はセラミック被覆としてセラ
ミックファイバー１２を使用したが、セラミック被覆の
材料としてはこれに限らず、例えば酸化硅素粉末とアル
ミナ粉末、とを混、合し、これを電４Ａ＃解して繊維状
に成形したものでもよく、これを上記バインダーと混合
して上記ヒータチュー １１０の断熱ｍｌに嵌挿されて
いる部分１０ａの外Ｗ面に上記バインダーで接着した場
合も上記第１の実施例と同様にヒータチューブの腐食を
防止できる。As described above, in the electric heat treatment furnace of this embodiment, the ceramic fiber 12 is bonded with a binder to the outer surface of the portion 103 that is inserted into the heat insulating layer 1 of the heater tube 7' 10 and is at a temperature that is likely to corrode. Since the coating is formed, the atmospheric gas in the furnace chamber 4 does not come into direct contact with the fitting portion tOa of the heater tube 10, and corrosion of the heater tube IO can be prevented. Example! used ceramic fiber 12 as the ceramic coating, but the material for the ceramic coating is not limited to this. For example, silicon oxide powder and alumina powder may be mixed, and the mixture may be electrolyzed using 4A # to form a fiber. Also, when this is mixed with the binder and adhered with the binder to the outer W surface of the portion 10a fitted into the heat insulating ml of the heater tube 110, the heater tube Can prevent corrosion.
次に本発明の第２の実施例について説明する。Next, a second embodiment of the present invention will be described.
４２図は本発明の第２の実施例による電熱式熱処理炉の
ヒータチューブの断熱層嵌挿部分を示す。FIG. 42 shows a portion into which a heat insulating layer is inserted into a heater tube of an electric heat treatment furnace according to a second embodiment of the present invention.
図において第１図と同じ符号は同じものを示し、１３は
アルミ被種処理により形成されたセラミック被覆であり
１．該アルミ被種処理とは、アルミニューム粉末、クロ
ム粉末、アクリル樹脂、および溶済を混合したものをヒ
ータチューブ１０の嵌挿部分１０１にへケ塗りしてＱ、
５ｍｍ程度の塗膜を形成し、これを７００６Ｃで１時間
焼成する処理をいい、これによりヒータチューブ１０の
嵌挿部分１０ａの外表面には酸化アルミニューム（アル
ミナ）および酸化クロムの層からなるセラミック被覆１
３が５０μ程度形成されるとともに、アルミニュームと
クロムの拡散層が上記嵌挿部分１０＆の内部に５μ程度
形成される。In the figure, the same reference numerals as in FIG. 1 indicate the same things, and 13 is a ceramic coating formed by aluminum seeding treatment; The aluminum seeding treatment involves applying a mixture of aluminum powder, chromium powder, acrylic resin, and melting agent to the insertion portion 101 of the heater tube 10.
This is a process in which a coating film of about 5 mm is formed and then fired at 7006C for 1 hour, thereby coating the outer surface of the insertion portion 10a of the heater tube 10 with a ceramic layer made of aluminum oxide (alumina) and chromium oxide. Covering 1
3 is formed to a thickness of about 50μ, and a diffusion layer of aluminum and chromium is formed to a thickness of about 5μ inside the insertion portion 10&.
本実施例の効果は上記第１の実施例の効果と同一である
。The effects of this embodiment are the same as those of the first embodiment.
同上記第２の実施例では、アルミニューム粉末等の混合
液をへケ塗りしこれを焼成してセラミック被接を形成し
たが、セラミック被覆の形成方法はこれに限らす、例え
ば溶融アルミニュームの中にヒータチューブを浸漬する
ことによってもアルミナからなるセラミック被覆を形成
できる。In the second embodiment, the ceramic coating was formed by applying a mixed solution of aluminum powder or the like and firing it, but the method for forming the ceramic coating is not limited to this. A ceramic coating of alumina can also be formed by immersing the heater tube therein.
また本発明はヒータチューブに限らず、攪拌ファンの軸
、サンツーリングチューブ、搬送装置、搬送位置検出ロ
ンド等ステンレス鋼でできたもので、その温度が腐会し
易い温度になるものにも適用できる。さらに本発明は電
熱式の焼鈍炉および焼準炉にも適用できるのは言うまで
もない。Furthermore, the present invention is not limited to heater tubes, but can also be applied to items made of stainless steel, such as stirring fan shafts, sun tooling tubes, conveyance devices, and conveyance position detection ronds, whose temperature is likely to cause corrosion. . Furthermore, it goes without saying that the present invention can also be applied to electrically heated annealing furnaces and normalizing furnaces.
以上のように本発明に係る電熱式熱処理炉によレバ、ヒ
ータチューブの断熱層に嵌挿されている部分の外表面に
耐熱および耐食性のあるセラミック被覆を形成したので
、雰囲気ガスがヒータチューブの断熱層を嵌挿する部分
に直接接触することはなく、該部分の高音を防止でき、
ヒータチューブの寿命を延長できる効果がある。As described above, in the electric heat treatment furnace according to the present invention, a heat-resistant and corrosion-resistant ceramic coating is formed on the outer surface of the lever and the portion of the heater tube that is fitted into the heat insulating layer, so that atmospheric gas is absorbed into the heater tube. It does not come into direct contact with the part where the insulation layer is inserted, preventing high-pitched sounds from that part,
This has the effect of extending the life of the heater tube.
第１図は本発明のｆｓｌの実施例による電熱式熱処理炉
の断面正面図、第２図は本発明の第２の実施例による電
熱式熱処理炉のヒータチューブの断熱層嵌挿部分を示す
断面図である。
ｌ・・・断熱ｍ、４・・・炉室、１０・・・ヒータチュ
ーブ、１０ａ・・・嵌挿されている部分％ １２．１３
・・・セラミック被覆つ
特許出願人 東洋工業株式会社
代理人 弁理士 早 瀬 憲 −第２図FIG. 1 is a cross-sectional front view of an electric heat treatment furnace according to an embodiment of the fsl of the present invention, and FIG. 2 is a cross section showing a portion where a heat insulating layer is inserted into a heater tube of an electric heat treatment furnace according to a second embodiment of the present invention. It is a diagram. l...insulation m, 4...furnace chamber, 10...heater tube, 10a...fitted part % 12.13
...Ceramic coating patent applicant: Toyo Kogyo Co., Ltd. agent, patent attorney Ken Hayase - Figure 2
Claims (1)
理芥囲気を形成するガスが導入される炉室と、上記断熱
層を貫通して上記炉室に突出した状態で配設されその内
部には電気ヒータが収容されたヒータチューブと、上記
断熱層に嵌挿されている部分のヒータチューブ外表面に
形成されたセラミック被覆とを備えたことを％徴とする
電熱式熱処理炉。(1) A heat insulating layer made of a heat insulating material, a furnace chamber surrounded by the heat insulating layer and into which gas forming a heat treatment atmosphere is introduced, and a furnace protruding through the heat insulating layer into the furnace chamber. An electric heat treatment furnace characterized by comprising: a heater tube in which an electric heater is housed; and a ceramic coating formed on the outer surface of the heater tube in a portion fitted into the heat insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227382A JPS58189318A (en) | 1982-04-28 | 1982-04-28 | Electric heating type heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7227382A JPS58189318A (en) | 1982-04-28 | 1982-04-28 | Electric heating type heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58189318A true JPS58189318A (en) | 1983-11-05 |
| JPH0214405B2 JPH0214405B2 (en) | 1990-04-09 |
Family
ID=13484507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7227382A Granted JPS58189318A (en) | 1982-04-28 | 1982-04-28 | Electric heating type heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58189318A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6357783A (en) * | 1986-08-28 | 1988-03-12 | Japan Atom Energy Res Inst | Zirconium alloy articles having chemically compacted ceramic film |
| JP2002357389A (en) * | 2001-06-04 | 2002-12-13 | Dowa Mining Co Ltd | Vacuum heat treating furnace |
| CN107557722A (en) * | 2014-07-23 | 2018-01-09 | 株式会社 Ihi | Cementing plant |
| JP2018090858A (en) * | 2016-12-02 | 2018-06-14 | Ｄｏｗａサーモテック株式会社 | Heat processing furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5324013A (en) * | 1967-08-17 | 1978-03-06 | Fisons Pharmaceuticals Ltd | Preparation of benzopyrone salts |
-
1982
- 1982-04-28 JP JP7227382A patent/JPS58189318A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5324013A (en) * | 1967-08-17 | 1978-03-06 | Fisons Pharmaceuticals Ltd | Preparation of benzopyrone salts |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6357783A (en) * | 1986-08-28 | 1988-03-12 | Japan Atom Energy Res Inst | Zirconium alloy articles having chemically compacted ceramic film |
| JP2002357389A (en) * | 2001-06-04 | 2002-12-13 | Dowa Mining Co Ltd | Vacuum heat treating furnace |
| JP4493881B2 (en) * | 2001-06-04 | 2010-06-30 | Ｄｏｗａホールディングス株式会社 | Vacuum heat treatment furnace |
| CN107557722A (en) * | 2014-07-23 | 2018-01-09 | 株式会社 Ihi | Cementing plant |
| US10323315B2 (en) | 2014-07-23 | 2019-06-18 | Ihi Corporation | Carburizing device |
| JP2018090858A (en) * | 2016-12-02 | 2018-06-14 | Ｄｏｗａサーモテック株式会社 | Heat processing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0214405B2 (en) | 1990-04-09 |
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