JPH0138870B2 - - Google Patents
Info
- Publication number
- JPH0138870B2 JPH0138870B2 JP28149984A JP28149984A JPH0138870B2 JP H0138870 B2 JPH0138870 B2 JP H0138870B2 JP 28149984 A JP28149984 A JP 28149984A JP 28149984 A JP28149984 A JP 28149984A JP H0138870 B2 JPH0138870 B2 JP H0138870B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- carburization
- carburizing
- depth
- hardness
- 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
- 239000007789 gas Substances 0.000 claims description 34
- 238000005255 carburizing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 15
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 230000003647 oxidation Effects 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 6
- 229920006384 Airco Polymers 0.000 description 5
- 238000005496 tempering Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- 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
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鋼部品のガス浸炭方法に関するもの
で、特に粒界酸化及び被処理物の形状による浸炭
むらが少く、しかも変成炉が不要で極めて経済的
なガス浸炭方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a gas carburizing method for steel parts, which is particularly effective in reducing grain boundary oxidation and carburizing unevenness due to the shape of the workpiece, and in addition, does not require a shift furnace. Concerning an economical gas carburizing method.
従来、ガス浸炭方法として種々の方法が提供さ
れているが、そのほとんどが変成炉で変成された
浸炭性ガスを使用しており、いずれも成分中には
直接浸炭に関与しないN2（及びH2）が含まれて
いる。
Conventionally, various gas carburizing methods have been provided, but most of them use carburizing gas transformed in a transformation furnace, and all of them contain N 2 (and H 2 ) is included.
浸炭の基本ガス反応は下記の通りである。 The basic gas reaction of carburizing is as follows.
CO／CO2＝ＫH2／H2O …(1)
2CO→〔Ｃ〕＋CO2 …(2)
すなわち、浸炭に直接関与するガスはCOのみ
であり、COの分圧が大きいほど浸炭は活発に行
われ、ヘルツ応力の発生する深さに於ける硬さが
大きくなり、さらにピツチングに強い硬度を得る
ことができ、さらにまた、被処理品の形状による
浸炭むら（例えば、被処理品が歯車である場合、
歯面と歯元との浸炭度の相違）が少くすることが
できる。 CO/CO 2 = KH 2 /H 2 O…(1) 2CO→[C]+CO 2 …(2) In other words, CO is the only gas directly involved in carburization, and the higher the partial pressure of CO, the more active carburization becomes. This process increases the hardness at the depth where Hertzian stress occurs, and also makes it possible to obtain hardness that is resistant to pitting. If it is,
The difference in degree of carburization between the tooth surface and the tooth base can be reduced.
他方、粒界酸化は自由エネルギー変化の温度依
存性（△Ｇ）表によりCO／CO2，H2／H2Oの値
により決定される。 On the other hand, grain boundary oxidation is determined by the values of CO/CO 2 and H 2 /H 2 O according to the temperature dependence of free energy change (ΔG) table.
そこで、最適のガス組成はCOの分圧が大きく、
CO／CO2の値が大きいことと言える。 Therefore, the optimal gas composition has a high partial pressure of CO,
It can be said that the value of CO/CO 2 is large.
さらに、従来、変成炉を不要とした経済的な浸
炭方法も提供されている（例えば、特公昭58−
5259号公報）。 Furthermore, economical carburizing methods that do not require a conversion furnace have also been provided (for example,
Publication No. 5259).
それら、変成炉を不要とした浸炭方法において
も、その成分中には浸炭に直接関与しないN2（及
びH2）が含まれている。また、N2をキヤリアガ
スとして使用するのではなく、むしろベスチブル
パージガスとして用い、浸炭炉内には炭化水素ガ
スと酸化性ガスとしてのH2Oあるいは空気を送
入し、炉内でRX類似ガスを発生させる方法
（AIRCO法）も提供されている（雑誌、工業加熱
第20巻第５号、1983年９月、第10ページ）。 Even in these carburizing methods that do not require a shift furnace, the components include N 2 (and H 2 ), which is not directly involved in carburizing. In addition, N 2 is not used as a carrier gas, but rather as a best purge gas, and hydrocarbon gas and H 2 O or air as an oxidizing gas are fed into the carburizing furnace, and RX-like gas is used in the carburizing furnace. A method (AIRCO method) for generating this is also provided (Magazine, Industrial Heating Vol. 20, No. 5, September 1983, p. 10).
上記のごときN2を含むガスを使用した浸炭方
法はN2によりCO，H2等がうすめられ、雰囲気中
におけるCOのみかけの分圧が下げられるため、
大量のガスが必要となり、さらにはエンリツチを
必要とし、炉内滞留時間の短縮等により反応時間
が不足し、炉内で平衡状態が得られず、浸炭むら
が生ずる場合があつた。 In the above carburizing method using a gas containing N2 , CO, H2, etc. are diluted by N2 , and the apparent partial pressure of CO in the atmosphere is lowered.
A large amount of gas is required, and furthermore, enrichment is required, and reaction time is insufficient due to shortened residence time in the furnace, etc., and an equilibrium state cannot be obtained in the furnace, resulting in uneven carburization.
それらはキヤリアーガスとしてN2ガスを使用
しない前記AIRCO法において空気を使用した場
合も、空気の主成分が窒素であるため同様であつ
た。 They were the same even when air was used in the AIRCO method, which does not use N 2 gas as a carrier gas, because the main component of air is nitrogen.
また、上記AIRCO法においてH2Oあるいは
CO2を使用した場合にはH2OあるいはCO2が分子
として安定しているため、反応系の分圧の中に完
全に組込まれることがなく、残り、遊離された状
態で出てきて粒界酸化の原因となるものであつ
た。 In addition, in the above AIRCO method, H 2 O or
When CO 2 is used, H 2 O or CO 2 is stable as a molecule, so it is not completely incorporated into the partial pressure of the reaction system, but remains and comes out in a liberated state, forming particles. This was the cause of field oxidation.
本発明は特にN2を排除し、浸炭に直接関与す
るガスのみを炉内に導入して浸炭処理を行うもの
であり、したがつて、雰囲気中のCOが一定とな
るようにコントロールすることも容易であり、直
接浸炭に関与しないガスにより雰囲気中における
COのみかけの分圧が下げられることもなく浸炭
むらが防止され、しかも粒界酸化を防止すること
ができる。しかも導入ガス量を少くしないと平衡
しないため、導入ガス量を節約することができ、
変成炉が不要であるため、極めて経済的であるも
のである。
The present invention specifically eliminates N 2 and introduces only the gas directly involved in carburization into the furnace to perform the carburizing process. Therefore, it is also possible to control the CO in the atmosphere to be constant. It is easy to use in the atmosphere with gases that are not directly involved in carburizing.
Uneven carburization is prevented without lowering the apparent partial pressure of CO, and furthermore, grain boundary oxidation can be prevented. Moreover, the amount of gas introduced can be saved because equilibrium will not occur unless the amount of introduced gas is reduced.
Since a conversion furnace is not required, it is extremely economical.
本発明はN2を排除し、浸炭に必要なガスだけ
を所定温度以上に保つた炉内に供給して浸炭を行
うものであり、H2も減少させ、COの分圧を大と
するものであり、炉内には少量の炭化水素ガスと
少量の純酸素のみを導入するものである。
The present invention eliminates N 2 and performs carburization by supplying only the gas necessary for carburization into a furnace kept at a predetermined temperature or higher, and also reduces H 2 and increases the partial pressure of CO. Only a small amount of hydrocarbon gas and a small amount of pure oxygen are introduced into the furnace.
本発明では炭化水素ガスと純酸素を所定温度に
保つた炉内に導入することにより、浸炭に必要な
雰囲気を生成させて浸炭を行うものである。
In the present invention, carburization is performed by introducing hydrocarbon gas and pure oxygen into a furnace maintained at a predetermined temperature to generate an atmosphere necessary for carburization.
すなわち、炭化水素ガスと純酸素が下記のごと
く反応してCOが生じ、このCOと被処理品表面で
分解して生じた活性炭素〔Ｃ〕が被処理品の表面
に浸透拡散するものである。 In other words, hydrocarbon gas and pure oxygen react as shown below to produce CO, and this CO and activated carbon [C], which is generated by decomposition on the surface of the object to be treated, permeate and diffuse into the surface of the object to be treated. .
(3)2CH4＋O2→2CO＋4H2
(4)2C3H8＋3O2→6CO＋8H2
(5)C4H10＋2O2→4CO＋5H2
２倍
2.8倍
３倍 CO%
33.3
42.2
44.3 実測値
29％
− 38％
（註．完全にCOとして反応するとする。）
したがつて、従来のごとく、直接浸炭に関与し
ないN2によりCO分圧が変動させられることもな
く、浸炭むらを少くすることができるものであ
る。(3)2CH 4 +O 2 →2CO+4H 2 (4)2C 3 H 8 +3O 2 →6CO+8H 2 (5)C 4 H 10 +2O 2 →4CO+5H 2 2x 2.8x 3x CO% 33.3 42.2 44.3 Actual value 29% - 38% (Note: It is assumed that the reaction occurs completely as CO.) Therefore, unlike conventional methods, the CO partial pressure is not fluctuated by N 2 , which does not directly participate in carburization, and uneven carburization can be reduced. It is.
また、H2O，CO2等を使用せず、炉内を730℃
以上に保つて純酸素を導入するため、粒界酸化も
生ずることがないものである。 In addition, the inside of the furnace is heated to 730℃ without using H 2 O, CO 2, etc.
Since pure oxygen is introduced while maintaining the temperature above, grain boundary oxidation does not occur.
被処理品は歯車（モジユール２）で、
SCr420Hからなり、第１図示のごとく、必然
的に歯面１及び歯元２が構成されている。
The product to be processed is a gear (module 2) made of SCr420H, and as shown in the first diagram, it necessarily consists of a tooth surface 1 and a tooth base 2.
(A) 本発明実施例
処理温度 930℃
処理時間 ２時間
導入ガス CH4＋O2
（３／min）（0.5／min）
上記処理後、最適焼入れ温度850℃まで自然冷
却し、そして油冷（100℃）した（焼戻しせず）。(A) Example of the present invention Treatment temperature: 930℃ Treatment time: 2 hours Introduced gas: CH 4 +O 2 (3/min) (0.5/min) After the above treatment, natural cooling to the optimum quenching temperature of 850℃, followed by oil cooling (100℃) °C) (without tempering).
上記処理後の歯車の歯面１及び歯元２の硬度及
び浸炭深さの測定結果は第２図示のごとくであ
る。 The measurement results of the hardness and carburization depth of the tooth flank 1 and root 2 of the gear after the above treatment are as shown in the second figure.
すなわち、表面の硬さはHmV762、浸炭深さ
は歯面１で0.74mm、歯元２で0.66mmであつた。 That is, the surface hardness was HmV762, and the carburization depth was 0.74 mm at tooth flank 1 and 0.66 mm at tooth root 2.
また、粒界酸化の状態を観察してみると、第３
図示のごとく、黒つぽい部分、線などの粒界酸化
はほとんどみられなかつた。 In addition, when observing the state of grain boundary oxidation, it was found that
As shown in the figure, almost no grain boundary oxidation such as dark areas or lines was observed.
なお、CO／CO2の値は29.0／0.07＝414であつ
た。 In addition, the value of CO/CO 2 was 29.0/0.07=414.
(B) 比較実施例(イ) AIRCO法。(B) Comparative Example (a) AIRCO method.
被処理品の材質、処理温度、処理時間、処理後
の焼入条件を上記本発明実施例と同じくして、導
入ガスのみをCH4＋Airに変更した。 The material of the article to be treated, the treatment temperature, the treatment time, and the quenching conditions after treatment were the same as in the above-mentioned examples of the present invention, and only the introduced gas was changed to CH 4 +Air.
（３／min）（３／min）
すなわち、純酸素にかえて、約80％の窒素を含
む空気を導入した。 (3/min) (3/min) That is, instead of pure oxygen, air containing about 80% nitrogen was introduced.
上記処理における歯車の歯面１及び歯元２の硬
度及び浸炭深さの測定結果は第４図示のごとくで
ある。 The measurement results of the hardness and carburization depth of the tooth flank 1 and root 2 of the gear in the above treatment are as shown in Figure 4.
すなわち、表面の硬さはＨmmV762、浸炭深さ
は歯面１で0.72mm、歯元２で0.44であつた。 That is, the surface hardness was HmmV762, and the carburization depth was 0.72 mm at tooth surface 1 and 0.44 at tooth root 2.
また、粒界酸化の状態を観察してみると、第５
図示のごとく、部分的に黒つぽい部分、線などの
粒界酸化が見られた。 In addition, when observing the state of grain boundary oxidation, it was found that
As shown in the figure, grain boundary oxidation such as dark areas and lines was observed in some areas.
なお、CO／CO2の値は20.5／0.039＝526であつ
た。 In addition, the value of CO/CO 2 was 20.5/0.039=526.
(C) 比較実施例(ロ) 従来のRXガス使用法。(C) Comparative example (b) Conventional method of using RX gas.
被処理品の材質、処理温度、処理時間、処理後
の焼入条件を上記本発明実施例と同じくして、導
入ガスをRXガス（CO 20％ H2 40％ N2 40
％）に変更した。 The material to be treated, treatment temperature, treatment time, and post-treatment quenching conditions were the same as in the above-mentioned embodiment of the present invention, and the introduced gas was RX gas (CO 20% H 2 40% N 2 40
%).
すなわち、約40％のN2が含まれている。 That is, it contains about 40% N2 .
上記処理における歯車の歯面１及び歯元２の硬
度及び浸炭深さの測定結果は第６図示のごとくで
ある。 The measurement results of the hardness and carburization depth of the tooth flank 1 and root 2 of the gear in the above treatment are as shown in FIG. 6.
すなわち、表面の硬さはＨｍV446、浸炭深さ
は歯面１で0.70mm、歯元２で0.36mmであつた。 That is, the surface hardness was HmV446, and the carburization depth was 0.70 mm at tooth flank 1 and 0.36 mm at tooth base 2.
また、粒界酸化の状態を観察してみると、第７
図示のごとく、比較的均等化された粒界酸化が見
られた。 In addition, when observing the state of grain boundary oxidation, it was found that
As shown, relatively uniform grain boundary oxidation was observed.
なお、CO／CO2の値は24.2／0.18＝134であつ
た。 In addition, the value of CO/CO 2 was 24.2/0.18=134.
第８図には前記本発明実施例と前記比較実施例
(イ)AIRCO法による歯面１部における焼戻しした
場合の浸炭深さと硬さの比較線図が示され、第９
図には歯元２部における焼戻しした場合の浸炭深
さと硬さの比較線図が示されている。 FIG. 8 shows the embodiment of the present invention and the comparative embodiment.
(b) A comparative diagram of carburization depth and hardness when tempering one part of the tooth surface by the AIRCO method is shown, and
The figure shows a comparison diagram of the carburization depth and hardness when tempering the two root parts.
なお、第８図、第９図における被処理品及び導
入ガス（量）は前記各実施例と同様であり、他の
処理条件は下記の通りである。 Note that the objects to be treated and the introduced gas (amount) in FIGS. 8 and 9 are the same as in each of the above embodiments, and other treatment conditions are as follows.
処理温度 930℃
処理時間 ４時間
上記処理後、最適焼入れ温度850℃まで自然冷
却し、油冷（100℃）し、180℃×２時間で焼戻し
したものである。 Treatment temperature: 930°C Treatment time: 4 hours After the above treatment, it was naturally cooled to the optimum hardening temperature of 850°C, oil-cooled (100°C), and tempered at 180°C for 2 hours.
第８図及び第９図を検討すると、比較実施例(イ)
に比べて本発明実施例では深く、硬い浸炭層を得
ることができ、また処理時間の短縮が可能である
ことが確認されたものである。 Examining Fig. 8 and Fig. 9, comparative example (a)
It was confirmed that, compared to the above, it was possible to obtain a deeper and harder carburized layer in the embodiments of the present invention, and the processing time could be shortened.
すなわち、第８図及び第９図において、処理温
度と処理時間が同一であるため全浸炭深さは同じ
であるが、有効深さ（Hmv530）についてみる
と、第８図では本発明実施例が約1.0mmであるの
に対して比較実施例(イ)では約0.7mm程度であり、
同様に第９図では本発明実施例が約0.8mmである
のに対し、比較実施例(イ)では0.6mm程度にすぎな
いものである。 That is, in FIGS. 8 and 9, the total carburizing depth is the same because the treatment temperature and treatment time are the same, but when looking at the effective depth (Hmv530), in FIG. While it is about 1.0 mm, it is about 0.7 mm in comparative example (a),
Similarly, in FIG. 9, the thickness of the embodiment of the present invention is about 0.8 mm, whereas the diameter of the comparative example (a) is only about 0.6 mm.
したがつて、処理温度と時間が同一の場合には
従来よりも浸炭による強度の向上を図ることがで
きるとともに、必要とする有効浸炭深さを得る場
合には処理時間の短縮を図ることができるもので
ある。 Therefore, if the treatment temperature and time are the same, it is possible to improve the strength by carburizing compared to the conventional method, and to obtain the required effective carburizing depth, the treatment time can be shortened. It is something.
本発明によれば炉内には直接浸炭に必要なガス
だけが導入される。
According to the present invention, only the gas necessary for direct carburizing is introduced into the furnace.
したがつて、直接浸炭に関与しないガスが存在
しないため、雰囲気中のCOのコントロールも容
易であり、被処理物の形状による浸炭むらを少く
することができる。 Therefore, since there is no gas that does not directly participate in carburization, it is easy to control CO in the atmosphere, and uneven carburization due to the shape of the object to be treated can be reduced.
さらに、導入されたガスは反応系の中に完全に
組込まれ、酸化を生じさせる余分な成分が存在し
ないため粒界酸化も少くすることができるもので
ある。 Furthermore, since the introduced gas is completely incorporated into the reaction system and no extra components that cause oxidation are present, grain boundary oxidation can also be reduced.
さらにまた、ガス使用量も少くてすみ変成炉を
必要としないため経済的である効果が得られるも
のである。 Furthermore, since the amount of gas used is small and a shift furnace is not required, an economical effect can be obtained.
図面は本発明の一実施例を示すもので、第１図
は被処理品の歯車の一部正面図、第２図は表面か
らの深さと硬さの関係を示す線図、第３図は粒界
酸化状態を示す金属組織の顕微鏡写真（倍率1000
倍）、第４図、第５図は比較実施例を示すもので、
第４図は表面からの深さと硬さの関係を示す線
図、第５図は粒界酸化状態を示す金属組織の顕微
鏡写真（倍率1000倍）、第６図、第７図はさらに
他の比較実施例を示し、第６図は表面からの深さ
と硬さの関係を示す線図、第７図は粒界酸化の状
態を示す金属組織の顕微鏡写真（倍率1000倍）、
第８図は本発明実施例と比較実施例(イ)における歯
車の歯面部における焼戻しした場合の浸炭深さと
硬さの比較線図、第９図は同じく歯元部における
浸炭深さと硬さの比較線図である。
１……（歯車の）歯面、２……（歯車の）歯
元。
The drawings show one embodiment of the present invention; Fig. 1 is a partial front view of a gear to be processed, Fig. 2 is a diagram showing the relationship between depth from the surface and hardness, and Fig. 3 is a diagram showing the relationship between hardness and depth from the surface. Micrograph of metal structure showing grain boundary oxidation state (1000 magnification)
Figures 4 and 5 show comparative examples.
Figure 4 is a diagram showing the relationship between depth from the surface and hardness, Figure 5 is a micrograph (1000x magnification) of the metal structure showing the grain boundary oxidation state, and Figures 6 and 7 are further diagrams showing the relationship between hardness and depth from the surface. Comparative examples are shown; Figure 6 is a diagram showing the relationship between depth from the surface and hardness; Figure 7 is a micrograph (1000x magnification) of the metal structure showing the state of grain boundary oxidation;
Fig. 8 is a comparison diagram of the carburization depth and hardness in the case of tempering the tooth surface portion of the gear in the example of the present invention and the comparative example (a), and Fig. 9 is a comparison diagram of the carburization depth and hardness in the root portion of the gear. It is a comparison diagram. 1...Tooth surface (of gear), 2...Tooth base (of gear).
Claims (1)
量の純酸素を導入し、窒素ガスを排除して浸炭処
理することを特徴とするガス浸炭方法。1. A gas carburizing method characterized by introducing hydrocarbon gas and a small amount of pure oxygen into a furnace kept at 730°C or higher and excluding nitrogen gas for carburizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28149984A JPS61159567A (en) | 1984-12-31 | 1984-12-31 | Gas carburizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28149984A JPS61159567A (en) | 1984-12-31 | 1984-12-31 | Gas carburizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61159567A JPS61159567A (en) | 1986-07-19 |
| JPH0138870B2 true JPH0138870B2 (en) | 1989-08-16 |
Family
ID=17640033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28149984A Granted JPS61159567A (en) | 1984-12-31 | 1984-12-31 | Gas carburizing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61159567A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0781855A1 (en) | 1995-12-28 | 1997-07-02 | Dowa Mining Co., Ltd. | Heat treatment apparatus |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5133813A (en) * | 1990-07-03 | 1992-07-28 | Tokyo Heat Treating Company Ltd. | Gas-carburizing process and apparatus |
| JP3301598B2 (en) * | 1997-10-29 | 2002-07-15 | ダイハツ工業株式会社 | Gas carburizing method |
| ITTO20110589A1 (en) * | 2011-07-04 | 2013-01-05 | Avio Spa | APPARATUS AND METHOD FOR DETERMINING THE EFFECTIVE DEPTH OF CEMENTATION OR NITRURATION OF STEEL COMPONENTS, IN PARTICULAR GEARS |
| JP6282002B2 (en) * | 2013-10-18 | 2018-02-21 | 康嗣 上島 | Heat treatment method for steel products |
-
1984
- 1984-12-31 JP JP28149984A patent/JPS61159567A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0781855A1 (en) | 1995-12-28 | 1997-07-02 | Dowa Mining Co., Ltd. | Heat treatment apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61159567A (en) | 1986-07-19 |
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