JPS6050159A - Gas carburization hardening method - Google Patents
Gas carburization hardening methodInfo
- Publication number
- JPS6050159A JPS6050159A JP15740583A JP15740583A JPS6050159A JP S6050159 A JPS6050159 A JP S6050159A JP 15740583 A JP15740583 A JP 15740583A JP 15740583 A JP15740583 A JP 15740583A JP S6050159 A JPS6050159 A JP S6050159A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- period
- carburizing
- carbon potential
- hardening
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
Abstract
Description
【発明の詳細な説明】
本発明は浸炭系ガスを用いて行なうガス浸炭焼入方法に
関し、特に遊離セメンタイトの析出を防止しうるようＫ
したガス浸炭焼入方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas carburizing and quenching method using a carburizing gas, and in particular, to prevent precipitation of free cementite.
The present invention relates to a gas carburizing and quenching method.
一般に、ガス浸炭焼入方法は、石油精製の過程テ得うれ
るエタン啼プロパン、ブタン等の炭化水素系ガス、また
は都市ガス・天然ガス等を、変成炉で燃焼嘔せることに
よってＣＯガスを含む浸炭性の吸熱形ガス（以下、ＲＸ
ガスという）を作り、これを処理炉に導入して浸炭と焼
入ｆＬ’６行なうものである。そして、このガス浸炭焼
入方法は、各種含炭量の鋼材を製造しつることは勿論、
均一な浸炭処理を行なうことができると共に、浸炭終了
後に直接焼入処理ができることから、人相生産に適し、
広く用いらオｔている。そして、その処即工程には、浸
炭期、拡散期、焼入加熱期の各工程がある。In general, the gas carburizing and quenching method involves burning hydrocarbon gas such as ethane, propane, butane, etc., obtained during the oil refining process, or city gas, natural gas, etc., in a conversion furnace to contain CO gas. Carburizing endothermic gas (hereinafter referred to as RX
In this process, a gas is produced, which is introduced into a processing furnace to carry out carburizing and quenching fL'6. This gas carburizing and quenching method can of course produce steel materials with various carburization contents.
It is suitable for humanoid production because it can perform uniform carburizing treatment and can directly quench after carburizing.
It is widely used. The immediate steps include a carburizing period, a diffusion period, and a quenching heating period.
ところで、従来技術によるこの種のカス浸炭焼入方法は
、浸炭期および拡散期においてなよ、浸炭能といわ几る
カーボン・ポテンシャルの調節・制御が行なわれていた
が、焼入加熱期にはカーボン・ポテンシャル制御の必要
が認識芒ルず、炉内雰囲気の制御が行なわ几ていなかっ
た。そのため、しばしば有害な遊離セメンタイト’４析
出芒ぜる等の欠陥発生があり、安定した品質が得らｆｌ
ないという欠点があった。By the way, in this type of carburizing and quenching method using conventional technology, the carbon potential, which is called carburizing ability, is adjusted and controlled during the carburizing and diffusion stages, but during the quenching and heating stage, The need for carbon potential control was not recognized and the atmosphere inside the furnace was not properly controlled. As a result, defects such as harmful free cementite '4 precipitation often occur, making it difficult to obtain stable quality.
There was a drawback that there was no
本発明は、前述のような従来方法の欠点を見い出したこ
とにエリ、焼入加熱期にもカーボン・ポテンシャルの制
御を行なうことによりてこｎｌ是正し、適正品質な浸炭
品の製３’ｆｑ’を容易に行ブよいうるようにしたガス
浸炭焼入方法を提供することを目的とするものである。The present invention has been made based on the discovery of the drawbacks of the conventional method as described above, and by controlling the carbon potential even during the quenching heating stage, the present invention corrects the problem and makes it possible to manufacture carburized products of appropriate quality. The object of the present invention is to provide a gas carburizing and quenching method that can be easily carried out.
上記目的を達成するために、本発明は、浸炭期、拡散期
および焼入加熱期にわたり、処理炉中の処理ガスのカー
ボン・ポテンシャルを予め定めた変化パターンになるよ
うに制御し、特に幣入加熱期においても、即ち温度下降
期においてもカーボン・ポテンシャルを共析点（０，７
７％Ｃ）付近に維持することにより、遊離上メンタイト
の析出を防止したことにある。In order to achieve the above object, the present invention controls the carbon potential of the processing gas in the processing furnace to have a predetermined change pattern during the carburizing period, the diffusion period, and the quenching heating period. Even during the heating period, that is, during the temperature decreasing period, the carbon potential is set to the eutectoid point (0,7
By maintaining the temperature near 7% C), precipitation of free mentite was prevented.
以下、本発明について図面に示す実施例により詳述する
。Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.
第１図は本発明方法を実施するための装置のブロック図
、第２図は本発明方法による浸炭期、拡散期および焼入
加熱期における各パラメータを示す線図である。FIG. 1 is a block diagram of an apparatus for implementing the method of the present invention, and FIG. 2 is a diagram showing each parameter in the carburizing period, diffusion period, and quenching heating period according to the method of the present invention.
まず、第１図において、１は浸炭および貌入れを行なう
処理炉本体、２は浸炭性処理ガス（ＲＸガス）を作る変
成炉を示し、該変成炉２からのＲ，Ｘガスは処理炉本体
１に送られる。３はＲＸガス雰囲気を調節し、カーボン
・ポテンシャルを上げるため、処理炉本体１にエンリッ
チガスを供給するエンリッチガス装置で、該エンリッチ
ガス装ｆζｑ３内のエンリッチガスとしてｔゴ、例えば
プロパン、ブタンウメタンノＪス等が使用８ｆ１．る。First, in Fig. 1, 1 indicates the processing furnace main body that performs carburizing and enveloping, 2 indicates a conversion furnace that produces carburizing processing gas (RX gas), and R and X gases from the conversion furnace 2 are supplied to the processing furnace main body. Sent to 1. 3 is an enrich gas device that supplies enrich gas to the processing furnace main body 1 in order to adjust the RX gas atmosphere and increase the carbon potential. etc. used 8f1. Ru.
４はカーボン・ポテンシャルを下げるため、処理炉本体
１に制御用ガスを供給する制御用ガス装置で、該制御用
ガス装置４内の制御用ガスとしては、例えばＣ０２，Ｎ
２ガス、Ａ ｒ ２ガス等が使用３ｔＬる。５は処理炉
本体１の炉内温度を測定する温度相、６は炉内雰囲気中
の００２チを測定するＣＯ２メータ會示す。７は制御装
置、８はエンリッチガス調節用の制御弁、９は同じく制
御用ガス調節用の制御弁を示し、前記制御装置７は温度
計５、ＣＯ２メータ６からの測定結果が入力ち几、浸炭
期、拡散期および焼入加熱期を通じて、前記温度計５か
ら入力嘔ｊ、る温度に対して対応するカーボン・ポテン
シャルが得られるようなＣＯ２％の演算全行ない、当該
演算結果とＣＯ２メータ６から入力される００２％とを
比較し、この結果に基づいて各制御弁８または９の弁開
度を調節し、処理炉本体内に供給すべきエンリッチガス
または制御用ガスの供給量を制御する機能を有する。4 is a control gas device that supplies a control gas to the processing furnace main body 1 in order to lower the carbon potential, and the control gas in the control gas device 4 includes, for example, C02, N
2 gas, Ar 2 gas, etc. are used for 3 tL. Reference numeral 5 indicates a temperature phase for measuring the temperature inside the processing furnace main body 1, and reference numeral 6 indicates a CO2 meter system for measuring 002chi in the atmosphere within the furnace. 7 is a control device, 8 is a control valve for regulating enriched gas, and 9 is a control valve for regulating gas for control, and the control device 7 receives measurement results from the thermometer 5 and the CO2 meter 6; Throughout the carburizing period, diffusion period, and quenching heating period, all CO2% calculations are performed to obtain the carbon potential corresponding to the temperature input from the thermometer 5, and the calculation results and the CO2 meter 6 are calculated. The valve opening degree of each control valve 8 or 9 is adjusted based on this result, and the amount of enriched gas or control gas to be supplied into the processing furnace main body is controlled. Has a function.
本発明方法に用いら几る装置は前述の」うに描記２図中
で従来方法で行なわ几だパターンを実線で示し、本発明
方法で改良嘔′ｉ′Ｌだ部分のみを点線で示す。The apparatus used in the method of the present invention is shown in Figure 2, as described above, with solid lines showing the patterns that were refined by the conventional method, and dotted lines showing only the parts that were improved by the method of the present invention.
まず、浸炭材料表面からの浸炭は、大部分次の反応式に
従う。First, carburization from the surface of a carburized material mostly follows the following reaction formula.
％式％（１）
ところで、ＲＸガスの浸炭能は、ガス成分中のＣＯ９！
ｌ、ＣＯ２チによって大部分決定されるが、ＣＯチには
大きく影響されず、ＣＯ２％によって大きく影＃ち−ｎ
る。通常、ＣＯ□チが増加すると、浸炭能が低下し、即
ちカーボン・ポテンシャルが下ると考えられている。従
って、通常ＣＯ２の制御にヨリ、カーボン・ポテンシャ
ル金制御する。然るに、ＲＸガスにおいては、ＣＯ係は
変成炉２で燃儲すべき原料ガス（例えば、プロパン・ブ
タン雫メタンガ、ス弁ｊ・）により定まる一定のイ直を
とるη・ら、悶炭・焼入ｆＥ、Ｉで用いらｒしるＩＸガ
スでは、浸炭能はＣＯ２チを変化憾せることＫよって制
御できる。% formula % (1) By the way, the carburizing ability of RX gas is CO9 in the gas component!
l, largely determined by CO2ch, but not significantly influenced by CO2, and greatly influenced by CO2%
Ru. It is generally believed that as CO□ increases, the carburizing ability decreases, that is, the carbon potential decreases. Therefore, in addition to controlling CO2, the carbon potential is controlled. However, in the case of RX gas, the CO section takes a certain amount of control determined by the raw material gas to be burned in the converter 2 (e.g., propane/butane methane gas, gas), charcoal/sintering, etc. For the IX gas used at the input fE, I, the carburizing ability can be controlled by varying the CO2 temperature.
なお、カーボン・ポテンシャルとはこの浸炭能ヲ表わし
、と力、により浸炭すべき鉄鋼製品の表面炭２濃度が決
定てれる。Incidentally, carbon potential represents this carburizing ability, and the surface carbon concentration of the steel product to be carburized is determined by force.
次に、第２図を参照し７つつ本発明方法を説明する。ま
ず、浸炭期においては、浸炭反応は鉄鋼製品の表面反応
と、表面から内部への拡散反応であるため、ある程度高
温の方がよく、第２ Ｆ’ｊｌ（イ）の実ｉＱ Ａ ノ
如＜９００ ＋＋＋９５０’Ｃの温度で行なわれる〇し
かし、この温度でにＲＸガスのみではカーボン・ポテン
シャルは、約０，４チ前後であり、こｎ、たけでは不十
分なため、この浸炭期では第２図（ロ）の実［８で示す
如くエンリッチガス装置３からエンリッチガス（本実施
例の場合、プロパン）を、処理炉本体１内に供給する。Next, the method of the present invention will be explained with reference to FIG. First, during the carburizing period, since the carburizing reaction is a surface reaction of the steel product and a diffusion reaction from the surface to the inside, a certain degree of high temperature is better. Carburizing is carried out at a temperature of 900 + + 950'C. However, at this temperature, the carbon potential is around 0.4 inches with only RX gas, and this amount is insufficient, so the second carburizing stage is carried out. As shown in Figure (B) [8], enrich gas (propane in this embodiment) is supplied from the enrich gas device 3 into the processing furnace main body 1.
このように、プロパンを処理炉本体１内に送ることによ
り、Ｃ０２チを下げカーボン・ポテンシャルを上げ、浸
炭効果を高メル。コノ結果、ＣＯ２％およびカーボン・
ポテンシャルの値の変化は、第２図（ハ）およびに）の
実１ｌｌＤおよびＦで示嘔九る如く変化する。以上の制
御は従来方法と変るところがない。In this way, by sending propane into the processing furnace main body 1, the carbon potential is lowered and the carbon potential is increased, thereby increasing the carburizing effect. Kono result, CO2% and carbon
The potential value changes as shown in the figures 111D and F in FIGS. 2(c) and 2). The above control is no different from the conventional method.
次Ｋ、拡散期についてであるが、従来方法では、第２図
←）の実線Ｂで示す如く、当該拡散期ではエンリッチガ
スは供給さ九てぃなかった。しかし、本発明方法では、
第２図←）の点線Ｃで示す如く、拡散期でもエンリッチ
ガスを実線Ｂよりも若干少なく供給する。この結果、Ｃ
ｏ２％とカーボン、ポテンシャルの変化は、第２図（ハ
）およびに）の点線ＥおよびＧにそ几ぞれ示すようにな
り、拡散期においてもカーボン・ポテンシャルを共析点
伺近に維持芒せることができる。Next, regarding the diffusion period, in the conventional method, as shown by the solid line B in Fig. 2←), the enriched gas was not supplied during the diffusion period. However, in the method of the present invention,
As shown by the dotted line C in FIG. 2←), slightly less enriched gas is supplied than the solid line B even during the diffusion period. As a result, C
The changes in o2% and carbon potential are shown in dotted lines E and G in Figures 2 (c) and 2), respectively, and the carbon potential is maintained close to the eutectoid point even during the diffusion period. can be set.
烙らに、焼入加熱期についてであるが、従来は、この焼
入加熱期ではカーボン・ポテンシャルの制御は行なわれ
ていない。即ち、従来から、温度一定の場合には、カー
ボン・ポテンシャ、ｚＩｊ： ＣＯ２：６ｚ増加すると
減少するという逆の関係にあり、温度が変化する場合に
はカーボン・ポテンシャルモｆ化し、温度が徐々に下る
場合には、ＣＯ２が増加するとカーボン・ポテンシャル
も増加するということは知らｎ、ている。し〃）シ、こ
几らの関係が従来明確に解明さ扛ていな力・ったため、
温度変化を伴なう焼入ｎ移行時のカーボン命ポテンシャ
ル制御が行なわｎていなかった。Regarding the quenching heating period, conventionally, the carbon potential has not been controlled during this quenching heating period. That is, conventionally, when the temperature is constant, there is an inverse relationship in which carbon potential decreases as it increases, and when the temperature changes, the carbon potential becomes f, and the temperature gradually decreases. We do not know that as CO2 increases, so does the carbon potential. Because the relationship between Shi〃) Shi, Koori and others has not been clearly clarified in the past,
Carbon life potential control during quenching transition, which involves temperature changes, was not performed.
例えば、焼入温度を７８０°Ｃ（５ＮＣ８１５の場合）
にする場合、Ｃ０２チは第２図（ハ）の実線りに示す曲
線の如＜０．８２％程度となり、カーボン・ポテンシャ
ルは０．９３％程度となって、明らかに共析点を越え、
遊離セメンタイトを析出する虞ｆＬがある。For example, set the quenching temperature to 780°C (for 5NC815)
In the case of
There is a risk that free cementite will precipitate.
従って、安定した浸炭製品を得るためには、焼入加熱期
においても、カーボン・ポテンシャルの制御が必要であ
ることを見い出した。Therefore, it has been found that in order to obtain a stable carburized product, it is necessary to control the carbon potential even during the quenching heating period.
そこで、本発明者は種々研究した結果、焼入加熱期のカ
ーボン・ポテンシャルを共析点付近に維持するように、
００２％全制御しながら温度変化嘔せつつ、焼入ｆＬ金
行なうことにより、遊離セメンタイトの析出を防止する
ことができることを知見した。本発明方法による焼入加
熱期のカーボン・ポテンシャルの制御は、第２図（ハ）
の実線りに示すＣ０２チの増加割合に比較し、第２図（
ハ）の点線Ｅに示す如く、焼入加熱期の開始と同時にＣ
Ｏ２％の供給を急激に増加嘔せ、もって第２図に）の点
線Ｇに示すようにカーボン・ポテンシャルを共析点近傍
に維持させようとするものである。Therefore, as a result of various researches, the present inventors decided to maintain the carbon potential during the quenching heating period near the eutectoid point.
It has been found that precipitation of free cementite can be prevented by carrying out quenching fL while controlling the temperature completely. The control of carbon potential during the quenching heating period by the method of the present invention is shown in Figure 2 (c).
Figure 2 (
As shown by the dotted line E in c), at the same time as the start of the quenching heating period, C
The aim is to rapidly increase the supply of O2%, thereby maintaining the carbon potential near the eutectoid point, as shown by the dotted line G in Figure 2).
本発明方法を実施するにあたっては、制御用ガス装置４
を設け、また該制御用ガス装置４から処理炉本体１に供
給する制御用ガス、例えはＣＯ２の供給量を制御するた
めに、制御装置７からの信号に基づいて弁開度が調節嘔
ルる制御弁９を設ける。In carrying out the method of the present invention, the control gas device 4
In addition, in order to control the supply amount of control gas, such as CO2, supplied from the control gas device 4 to the processing furnace main body 1, the valve opening degree is adjusted based on a signal from the control device 7. A control valve 9 is provided.
そして、カーボン・ポテンシャルを共析点付近に維持す
るように、制御弁９の弁開度からＣＯ２の供給量を制御
しつつ温度変化を行ない、焼入九する。従って、本発明
方法においては、焼入加熱期の温度変化を第２図ｆ１）
の実線Ａとした場合、ＣＯ２チの変化を第２図（ハ）の
点線Ｅとなるように制御することにより、カーボン・ポ
テンシャルを第２１Ｚ、に）の点線Ｇの如く共析点近傍
に維持することができ、もって遊離セメンタイトの析出
を防止することができる。Then, the temperature is changed while controlling the amount of CO2 supplied from the opening degree of the control valve 9 so as to maintain the carbon potential near the eutectoid point, and quenching is performed. Therefore, in the method of the present invention, the temperature change during the quenching heating period is shown in Fig. 2 f1).
By controlling the change in CO2 so that it becomes the dotted line E in Figure 2 (C), the carbon potential can be maintained near the eutectoid point as shown in the dotted line G in Figure 2 (C). Therefore, precipitation of free cementite can be prevented.
本発明に係るガス浸炭焼入方法は以上詳細に述べた如く
であって、下記各項の効果を奏する。The gas carburizing and quenching method according to the present invention has been described in detail above, and has the following effects.
■ 焼入加熱期までカーボン・ポテンシャルの制御を行
なうことにより、適正な所定の表面炭素濃度の浸炭製品
を得ることができる。- By controlling the carbon potential up to the quenching heating stage, a carburized product with an appropriate predetermined surface carbon concentration can be obtained.
■ 浸炭・焼入九処理において、遊離セメンタイトの析
出を防止しうるから、不良の発生がなく、安定な品質の
浸炭製品の製造を行なうことができる。■ In the carburizing/quenching process, precipitation of free cementite can be prevented, so carburized products of stable quality can be manufactured without defects.
■ 最終段階である焼入加熱期にカーボン・ポテンシャ
ルの制御を行なうため、前処理工程全体の浸炭効率を改
良し、また初期の浸炭期におけるカーボン・ポテンシャ
ルをより高くし、浸炭速）１１を早めることができる。■ In order to control the carbon potential during the final stage of quenching and heating, the carburizing efficiency of the entire pretreatment process is improved, and the carbon potential during the initial carburizing stage is made higher, increasing the carburizing speed (11). be able to.
第１図は本発明方法を実施するための装置のブロック図
、第２図は浸炭期、拡散期および焼入加熱期における各
パラメータを示し、第２図０ンは温度特性を示す線図、
第２図←）はエンリッチガスとしてのプロパン供給量を
示す線図、第２図（ハ）は処理炉本体内の二酸化炭素量
を示す線図、第２図に）はカーボン・ポテンシャルを示
す線図である。
１・・・処理炉本体、２・・・変成炉、３・・・エンリ
ッチガス装置、４・・・制御用ガス装置、５温度泪、６
・・・ＣＯ２メータ、７・・・制御装置、８，９・・・
制御弁。
第１図
第２図
（イFig. 1 is a block diagram of an apparatus for implementing the method of the present invention, Fig. 2 shows each parameter in the carburizing period, diffusion period, and quenching heating period, and Fig. 2 is a diagram showing temperature characteristics.
Figure 2 (←) is a diagram showing the amount of propane supplied as enriched gas, Figure 2 (c) is a diagram showing the amount of carbon dioxide in the processing furnace body, and Figure 2) is a diagram showing the carbon potential. It is a diagram. DESCRIPTION OF SYMBOLS 1... Processing furnace main body, 2... Shift furnace, 3... Enrich gas device, 4... Control gas device, 5 Temperature tear, 6
...CO2 meter, 7...control device, 8,9...
control valve. Figure 1 Figure 2 (I)
Claims (1)
に保持し、拡散期および焼入加熱期においてはカーボン
・ポテンシャルを共析点付近に維持するように、処理ガ
ス成分を制御することを特徴とするガス浸炭焼入方法。It is characterized by controlling the processing gas components so that the carbon potential is maintained above the total eutectoid point during the carburizing period, and the carbon potential is maintained near the eutectoid point during the diffusion period and the quenching heating period. Gas carburizing quenching method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15740583A JPS6050159A (en) | 1983-08-29 | 1983-08-29 | Gas carburization hardening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15740583A JPS6050159A (en) | 1983-08-29 | 1983-08-29 | Gas carburization hardening method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6050159A true JPS6050159A (en) | 1985-03-19 |
Family
ID=15648910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15740583A Pending JPS6050159A (en) | 1983-08-29 | 1983-08-29 | Gas carburization hardening method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6050159A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0825274A2 (en) * | 1990-07-03 | 1998-02-25 | Dowa Mining Co., Ltd. | Gas-carburizing process and apparatus |
| JP2002293353A (en) * | 2001-03-29 | 2002-10-09 | Yoshino Kogyosho Co Ltd | Applying device |
| JP2012092423A (en) * | 2010-09-30 | 2012-05-17 | Dowa Thermotech Kk | Method of gas carburizing |
| JP2012092424A (en) * | 2010-09-30 | 2012-05-17 | Dowa Thermotech Kk | Method and device of gas carburizing |
| JP2017106054A (en) * | 2015-12-08 | 2017-06-15 | 日本エア・リキード株式会社 | Carburization system and production method of surface hardened steel |
| JP2019119892A (en) * | 2017-12-28 | 2019-07-22 | エア・ウォーター株式会社 | Gas carburization method |
| JP2020196943A (en) * | 2019-06-05 | 2020-12-10 | エア・ウォーター株式会社 | Gas carburizing method and gas carburizing apparatus |
-
1983
- 1983-08-29 JP JP15740583A patent/JPS6050159A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0825274A2 (en) * | 1990-07-03 | 1998-02-25 | Dowa Mining Co., Ltd. | Gas-carburizing process and apparatus |
| EP0825274A3 (en) * | 1990-07-03 | 1998-05-13 | Dowa Mining Co., Ltd. | Gas-carburizing process and apparatus |
| JP2002293353A (en) * | 2001-03-29 | 2002-10-09 | Yoshino Kogyosho Co Ltd | Applying device |
| JP2012092423A (en) * | 2010-09-30 | 2012-05-17 | Dowa Thermotech Kk | Method of gas carburizing |
| JP2012092424A (en) * | 2010-09-30 | 2012-05-17 | Dowa Thermotech Kk | Method and device of gas carburizing |
| JP2017106054A (en) * | 2015-12-08 | 2017-06-15 | 日本エア・リキード株式会社 | Carburization system and production method of surface hardened steel |
| JP2019119892A (en) * | 2017-12-28 | 2019-07-22 | エア・ウォーター株式会社 | Gas carburization method |
| JP2020196943A (en) * | 2019-06-05 | 2020-12-10 | エア・ウォーター株式会社 | Gas carburizing method and gas carburizing apparatus |
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