JPH02200723A - Method for reducing partial pressure of oxygen in furnace atmosphere - Google Patents
Method for reducing partial pressure of oxygen in furnace atmosphereInfo
- Publication number
- JPH02200723A JPH02200723A JP2059589A JP2059589A JPH02200723A JP H02200723 A JPH02200723 A JP H02200723A JP 2059589 A JP2059589 A JP 2059589A JP 2059589 A JP2059589 A JP 2059589A JP H02200723 A JPH02200723 A JP H02200723A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- oxygen
- partial pressure
- carbon
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000001301 oxygen Substances 0.000 title claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229960005419 nitrogen Drugs 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 13
- 238000005261 decarburization Methods 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012774 insulation material Substances 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
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Landscapes
- Furnace Details (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、無酸化焼鈍炉等の雰囲気炉において、炉内雰
囲気中の酸素分圧を低減させる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 method for reducing the oxygen partial pressure in the atmosphere in an atmosphere furnace such as a non-oxidizing annealing furnace.
構造用合金鋼、軸受鋼、肌焼鋼、炭素鋼等を無酸化、無
脱炭にて焼鈍する雰囲気炉では従来から炉内雰囲気の成
分コントロールをする方法として次の三つが掲げられる
。In atmospheric furnaces for annealing structural alloy steel, bearing steel, case hardening steel, carbon steel, etc. without oxidation or decarburization, the following three methods have been proposed to control the composition of the atmosphere inside the furnace.
（１）ガスジェネレータにより発生させた変成ガスを炉
内へ供給しその炉内雰囲気のＣｏ／ＣＯ，を分析しコン
トロールする方法。(1) A method of supplying a converted gas generated by a gas generator into a furnace and analyzing and controlling Co/CO in the atmosphere inside the furnace.
（２）第５図に示したように炉体ａに窒素ガスボンベか
ら流量計すを通して供給される窒素ガスを基ガスとして
用い、これにＣＯまたはＨ７等の還元性ガスを流量計Ｃ
を通して微量補給する方法。(2) As shown in Figure 5, nitrogen gas supplied from a nitrogen gas cylinder to the furnace body a through the flow meter is used as the base gas, and a reducing gas such as CO or H7 is added to the flow meter C.
How to replenish small amounts through.
（３）第６図に示したように」−記（２）と同様基ガス
として窒素ガスを流量計すを通して供給し、これにＣＰ
センサまたは分析計ｄによって検出した炉内カーボンポ
テンシャル値に従いコントロール弁ｅを制御し生ＬＰＧ
、ブタン、メタノール等の炭化水素系のものを炉内に適
を供給する方法。(3) As shown in Figure 6, nitrogen gas is supplied as the base gas through the flowmeter as in (2), and CP
The control valve e is controlled according to the in-furnace carbon potential value detected by the sensor or analyzer d, and the raw LPG is
A method of feeding hydrocarbons such as butane, methanol, etc. into the furnace.
これらの方法はいずれも炉内雰囲気中の酸素分圧を低く
することを目的としてなされるものである。All of these methods are aimed at lowering the oxygen partial pressure in the furnace atmosphere.
しかるに上記方法（］）は当初の設備費が多くかかる欠
点がある。このため近時は方法（２）または（３）が多
くなっ°Ｃ來゛ているゆ
しかし方法（２）におけるＣＯガス添加方法はＣＯガス
（ボンベガス）が現況で数千円〜１１内／ｒｒｒＮと非
常に高価であるのでランニングコストが高くなると共に
、炉口りに危険性の高いＣＯガス配管を設けなければな
らないので操業の安全性が問題であり、さらにはＣＯガ
スが炉内の低温部でスス化し易いという問題がある。ま
た、方法（２）の夏（。However, the above method () has the disadvantage of requiring a large initial equipment cost. For this reason, methods (2) and (3) are becoming more common these days.The CO gas addition method in method (2) is currently several thousand yen to 11/rrrN. It is extremely expensive, which increases running costs, and it is necessary to install highly dangerous CO gas piping at the furnace mouth, which poses operational safety issues. There is a problem that it easily turns into soot. Also, method (2) summer (.
ガス添加法においてはＨ，ガスが炉内の酸素と結合して
水分を生成させるために炉内雰囲気の露点を上昇させる
という問題がある。In the gas addition method, there is a problem in that the H gas combines with oxygen in the furnace to generate moisture, thereby raising the dew point of the atmosphere in the furnace.
また上記方法（３）は添加するものが可燃性が高いため
操炉上書に爆発の危険が伴い、防爆のためのコントロー
ラ、センサを必要とし操作も難しいこと、および炉内雰
囲気条件を変更するのに必要な待ち時間が長いというよ
うな間８点があった。In addition, in method (3), the additives are highly flammable, so there is a risk of explosion when overwriting the furnace, and it requires a controller and sensor to prevent explosions, making it difficult to operate, and it requires changing the atmospheric conditions inside the furnace. There was a score of 8 for the long waiting time required.
本発明の炉内雰囲気中の酸素分圧低減方法は上記問題点
を解決するため、炉内に窒素ガスのみを送気し、該窒素
ガス雰囲気の基で炉内の処理品を加熱する雰囲気炉にお
いて、該処理品と共に加熱されるように炉内に高純度の
カーボンを配置し該カーボンと炉内の微量な酸素とを反
応させるようにしたことを特徴としたものである。In order to solve the above-mentioned problems, the method for reducing the partial pressure of oxygen in the furnace atmosphere of the present invention is an atmospheric furnace in which only nitrogen gas is fed into the furnace and the processed products in the furnace are heated in the nitrogen gas atmosphere. The present invention is characterized in that high-purity carbon is placed in the furnace so as to be heated together with the processed product, and the carbon reacts with a trace amount of oxygen in the furnace.
炉内雰囲気中の酸素がカーボンとの反応により消費され
てその酸素分圧を低減させる。Oxygen in the furnace atmosphere is consumed by reaction with carbon, reducing its oxygen partial pressure.
第１図に示した実施例は炉体ｌ内床部にカーボンの粒子
または破片２を配置したもので、図中３は炉体１内に設
けられた処理品、４は該処理品３を加熱するヒータ、５
は窒素ガスを流蓋計６を介して炉体１内へ供給する給ガ
ス管である。炉体ｌ内はこの給ガス管により供給された
窒素ガス雰囲気となるが、そのガス源であるボンベに充
填された市販の窒素ガス中には酸素が数ｐｐｒｎ〜数百
ｐｐｉｎ含まれており、また、処理品３を炉体１に装入
するときに外部から持ち込まれる＃素、および処理品表
面のスケール還元により生成される微量な酸素等が炉体
１内に滞留する。ところでこれらの炉内酸素はカーボン
破片２と反応し一酸化炭素を生成させる。このため炉内
の酸素分圧（ａｔｍ）は低くなり処理品３の酸（（、脱
炭が防止される。In the embodiment shown in FIG. 1, carbon particles or fragments 2 are placed on the inner floor of the furnace body 1. In the figure, 3 is a treated product installed in the furnace body 1, and 4 is the treated product 3. heater for heating, 5
is a gas supply pipe that supplies nitrogen gas into the furnace body 1 via the flow cap meter 6. The inside of the furnace body 1 becomes a nitrogen gas atmosphere supplied by this gas supply pipe, but the commercially available nitrogen gas filled in the cylinder that is the gas source contains oxygen in the range of several pprn to several hundred ppin. Further, when the processed product 3 is charged into the furnace body 1, # elements brought in from the outside and a trace amount of oxygen generated by scale reduction on the surface of the processed product remain in the furnace body 1. Incidentally, the oxygen in the furnace reacts with the carbon debris 2 to generate carbon monoxide. Therefore, the oxygen partial pressure (ATM) in the furnace becomes low, and decarburization of the processed product 3 is prevented.
第２図に示した炉体ｌでは、炉内壁面にカーボン類の断
熱材７を゛貼設し該断熱材７と炉内酸素とを反応さ瞳る
ことにより酸素分圧を低減さセようとするものである。In the furnace body l shown in Fig. 2, the oxygen partial pressure is reduced by attaching a carbon-based heat insulating material 7 to the inner wall surface of the furnace and allowing the heat insulating material 7 to react with the oxygen in the furnace. That is.
また第３図に示した炉体１では、カーボン製ヒータ８を
炉内に設け、該ヒータ８を炉内酸素と反応させるように
したものである。このようにヒータに用いた場合はカー
ボン自体が高い温度に加熱されるので炉内酸素との反応
がより活発になる利点があると共にそのカーボンの摩耗
量がヒータの電気抵抗の変化で検知でき交換の目安が立
て易い利点がある。この第３図に示したカーボン製ヒー
タ８による炉体ｌ内に処理品として５３５Ｃ−３５５Ｃ
を配置し炉体１内に酸素分圧＃ｇｏ−ｈａ Ｌ ｍの窒
素ガスを供給し第４図に示した温度カーブにて焼鈍処理
をした結果、炉内酸素分圧はｉｏ″” ａ ｔ ｍ以下
に保持され処理品３はフェライト脱炭Ｄ＋ｙ＋Ｆがゼロ
で、トータル脱炭Ｄ ｍ Ｔは３／１００〜４／１００
ｔｍという穫めて低い値に抑えることができ、従来の
前記方法（２）と比較して何ら損色のない処理結果が得
られた。Further, in the furnace body 1 shown in FIG. 3, a carbon heater 8 is provided in the furnace, and the heater 8 is caused to react with oxygen in the furnace. When used in a heater in this way, the carbon itself is heated to a high temperature, which has the advantage of making the reaction with the oxygen in the furnace more active, and the amount of carbon wear can be detected by changes in the heater's electrical resistance, allowing replacement. It has the advantage of being easy to set a guideline for. 535C-355C as a processed product in the furnace body l by the carbon heater 8 shown in FIG.
As a result of supplying nitrogen gas with an oxygen partial pressure #go-ha Lm into the furnace body 1 and annealing according to the temperature curve shown in Fig. 4, the oxygen partial pressure in the furnace was io''''a t. Ferrite decarburization D + y + F of treated product 3, which is maintained below m, has zero ferrite decarburization D m T, and the total decarburization D m T is 3/100 to 4/100.
It was possible to suppress the value of tm to a very low value, and a processing result with no color loss was obtained compared to the conventional method (2).
このように本発明に係る炉内雰囲気中の酸素分圧低減方
法によれば、安全にしかも簡単に炉内酸素分圧を低減で
き各種鋼材を低コストで無酸化無脱炭にて熱処理できる
ようにする誠に有益な効果がある。As described above, according to the method for reducing the oxygen partial pressure in the furnace atmosphere according to the present invention, the oxygen partial pressure in the furnace can be reduced safely and easily, and various steel materials can be heat treated at low cost without oxidation or decarburization. It has a really beneficial effect.
【図面の簡単な説明】
第１図〜第３図は本発明に係る炉内雰囲気中の酸素分圧
低減方法の実施例を示した炉体の断面図である。第４図
はその処理品の温度カーブを示した線図である。第５図
および第６図は従来の炉内雰囲気中の酸素分圧低減方法
を示した炉体の断面図である。
１・・・炉体、２・・・カーボン破片、３・・・処理品
、４・・・ヒータ、５・・・給ガス管、７・・・カーボ
ン製断熱材、８・・・カーボン製ヒータ。
ｔ（ｈ）
第１図
第２図BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are cross-sectional views of a furnace body showing an embodiment of the method for reducing the partial pressure of oxygen in the atmosphere in a furnace according to the present invention. FIG. 4 is a diagram showing the temperature curve of the processed product. FIGS. 5 and 6 are cross-sectional views of a furnace body showing a conventional method for reducing the partial pressure of oxygen in the atmosphere inside the furnace. DESCRIPTION OF SYMBOLS 1...Furnace body, 2...Carbon debris, 3...Processed product, 4...Heater, 5...Gas supply pipe, 7...Carbon insulation material, 8...Carbon product heater. t(h) Figure 1 Figure 2
Claims (1)
炉内の処理品を加熱する雰囲気炉において、該処理品と
共に加熱されるように炉内に高純度のカーボンを配置し
該カーボンと炉内の微量な酸素とを反応させるようにし
たことを特徴とする炉内雰囲気中の酸素分圧低減方法。In an atmosphere furnace in which only nitrogen gas is supplied into the furnace and the processed products in the furnace are heated in the nitrogen gas atmosphere, high-purity carbon is placed in the furnace so that it is heated together with the processed products. A method for reducing the partial pressure of oxygen in a furnace atmosphere, characterized by causing carbon to react with a small amount of oxygen in the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2059589A JPH02200723A (en) | 1989-01-30 | 1989-01-30 | Method for reducing partial pressure of oxygen in furnace atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2059589A JPH02200723A (en) | 1989-01-30 | 1989-01-30 | Method for reducing partial pressure of oxygen in furnace atmosphere |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02200723A true JPH02200723A (en) | 1990-08-09 |
Family
ID=12031618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2059589A Pending JPH02200723A (en) | 1989-01-30 | 1989-01-30 | Method for reducing partial pressure of oxygen in furnace atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02200723A (en) |
-
1989
- 1989-01-30 JP JP2059589A patent/JPH02200723A/en active Pending
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