JP4327812B2 - Manufacturing method of carburized parts - Google Patents
Manufacturing method of carburized parts Download PDFInfo
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- JP4327812B2 JP4327812B2 JP2006059685A JP2006059685A JP4327812B2 JP 4327812 B2 JP4327812 B2 JP 4327812B2 JP 2006059685 A JP2006059685 A JP 2006059685A JP 2006059685 A JP2006059685 A JP 2006059685A JP 4327812 B2 JP4327812 B2 JP 4327812B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 59
- 239000010959 steel Substances 0.000 claims description 59
- 238000005255 carburizing Methods 0.000 claims description 54
- 238000000034 method Methods 0.000 claims description 40
- 238000010791 quenching Methods 0.000 claims description 27
- 230000000171 quenching effect Effects 0.000 claims description 26
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims 1
- 239000011651 chromium Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 13
- 238000003795 desorption Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000004868 gas analysis Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
本発明は、浸炭部品の製造方法に関する。 The present invention also relates to the production how of carburized parts.
浸炭処理は、低炭素鋼または低炭素合金鋼などの加工性のよい鋼を機械加工した後、その鋼の表面層の炭素量を増加させ、表面層のみを焼入硬化する処理方法である。浸炭処理を施した鋼の内部は炭素量が少なく柔軟な組織のままであるために靭性が高く、また表面層は炭素量が多いために耐磨耗性が高い。浸炭処理が施された鋼はこのような利点を有するので、各種の機械部品に広く応用されている。浸炭処理の具体的な方法としては、浸炭性ガスを用いて行なわれるガス浸炭処理が主流であるが、ガス浸炭処理では、鋼の表面の位置によって浸炭層が形成される深さにムラが発生する場合がある。この浸炭の深さのムラを浸炭ムラという。 The carburizing treatment is a treatment method in which a steel having good workability such as low carbon steel or low carbon alloy steel is machined, and then the amount of carbon in the surface layer of the steel is increased to quench and harden only the surface layer. The carburized steel has high toughness because it has a low carbon content and a flexible structure, and the surface layer has high wear resistance because of its high carbon content. Since the carburized steel has such advantages, it is widely applied to various machine parts. As a specific method of carburizing treatment, gas carburizing treatment using carburizing gas is the mainstream, but in gas carburizing treatment, unevenness occurs in the depth at which the carburized layer is formed depending on the position of the steel surface. There is a case. This uneven carburization depth is called carburizing unevenness.
ところで、浸炭処理方法の一つとして真空浸炭処理がある。真空浸炭処理とは、減圧された浸炭性ガスを真空中（減圧雰囲気中）に導入することで浸炭処理を行なう浸炭処理方法である。真空浸炭処理に関しては、たとえば特許第３５３１７３６号（特許文献１）、特開２００４−１６９１０１号公報（特許文献２）、または特許第３４４２７３７号（特許文献３）などに記載されている。一般に浸炭ムラができる原因は、鋼の表面に生成する酸化膜にあると考えられている。上記真空浸炭処理によれば、酸化膜の生成が抑止されるので、浸炭ムラの発生をある程度抑制することができる。 Incidentally, there is a vacuum carburizing process as one of the carburizing processes. The vacuum carburizing treatment is a carburizing treatment method in which carburizing treatment is performed by introducing a reduced carburizing gas into a vacuum (in a reduced pressure atmosphere). The vacuum carburizing process is described in, for example, Japanese Patent No. 3531736 (Patent Document 1), Japanese Patent Application Laid-Open No. 2004-169101 (Patent Document 2), or Japanese Patent No. 3442737 (Patent Document 3). In general, the cause of uneven carburization is considered to be an oxide film formed on the surface of steel. According to the vacuum carburizing process, since the formation of an oxide film is suppressed, the occurrence of carburizing unevenness can be suppressed to some extent.
また、鋼に含まれる成分の中でＣｒ（クロム）は、特に酸化膜の生成が起こりやすい成分である。Ｃｒを多く含んでいる鋼ほど浸炭ムラが発生しやすい。一般に、Ｃｒを多く含むステンレス鋼では安定なＣｒ酸化膜が生成される。このため、Ｃｒを多く含むステンレス鋼についてはガス浸炭処理が困難であることが知られており、真空浸炭処理が採用されている。
しかしながら、上記の真空浸炭処理を行なっても、浸炭ムラの発生を十分抑止することができないという問題があった。また、真空浸炭処理には浸炭時に煤が発生する問題があるので、真空浸炭処理は浸炭処理方法の主流にはなっていない。 However, there has been a problem that even if the above-described vacuum carburizing treatment is performed, the occurrence of carburizing unevenness cannot be sufficiently suppressed. Moreover, since there is a problem that soot is generated during carburizing in the vacuum carburizing process, the vacuum carburizing process is not the mainstream carburizing method.
Ｃｒを多く含む鋼（Ｃｒの含有量３．５質量％以上の鋼）について浸炭ムラの発生を抑止し得る一つの方法として、浸炭処理前の鋼に大気中において９００℃以上の温度で熱処理を施すことが行なわれている。しかし、この熱処理を施すと、浸炭処理後に得られた完成品（浸炭部品）において表面硬度が低下するという問題があった。 As one method that can suppress the occurrence of uneven carburization of steel containing a large amount of Cr (steel with a Cr content of 3.5% by mass or more), heat treatment is performed on the steel before carburizing at a temperature of 900 ° C. or higher in the atmosphere. It is done. However, when this heat treatment is performed, there is a problem that the surface hardness of the finished product (carburized part) obtained after the carburizing process is lowered.
したがって、本発明の目的は、浸炭ムラの発生および表面硬度の低下を抑止することのできる浸炭部品の製造方法を提供することである。 Accordingly, an object of the present invention is to provide a manufacturing how the carburized component that can suppress the decrease in the generation and surface hardness of the carburized unevenness.
本発明の浸炭部品の製造方法は、３．５質量％以上のＣｒを含む鋼の表面に酸化膜を形成する酸化工程と、酸化工程後、鋼を浸炭する浸炭工程と、浸炭工程後、鋼の表面から酸化膜を除去する除去工程と、除去工程後、鋼を焼入れる焼入工程とを備えている。 The method of manufacturing a carburized component according to the present invention includes an oxidation process for forming an oxide film on the surface of steel containing 3.5 mass% or more of Cr, a carburization process for carburizing steel after the oxidation process, a carburization process, A removal step of removing the oxide film from the surface of the steel, and a quenching step of quenching the steel after the removal step.
本願発明者は、鋼が３．５質量％以上のＣｒを含む場合には、鋼の表面に形成された酸化膜が脱炭を助長し、浸炭部品の表面硬度の低下を招いていることを見出した。すなわち、予め鋼の表面に酸化膜を形成しておくことによって、浸炭時に浸炭ムラの発生を抑止することができる。一方で浸炭後に鋼を焼入れる際には、この酸化膜の成分（特に酸素）が鋼の表面に存在する炭素と結びつき、ガスとして放出される。その結果、焼入によって鋼が脱炭され、浸炭部品の表面硬度が低下する。 The inventor of the present application indicates that when steel contains 3.5 mass% or more of Cr, the oxide film formed on the surface of the steel promotes decarburization, leading to a decrease in the surface hardness of the carburized component. I found it. That is, by forming an oxide film on the surface of steel in advance, it is possible to suppress the occurrence of carburizing unevenness during carburizing. On the other hand, when the steel is quenched after carburizing, the components of the oxide film (especially oxygen) are combined with the carbon present on the surface of the steel and released as a gas. As a result, the steel is decarburized by quenching, and the surface hardness of the carburized component decreases.
そこで、本発明の浸炭部品の製造方法によれば、焼入工程前に酸化膜を除去するので、焼入工程における脱炭を抑止することができる。その結果、浸炭工程において酸化膜によって浸炭ムラの発生を抑止しつつ、表面硬度の低下を抑止することができる。 Then, according to the manufacturing method of the carburized component of this invention, since an oxide film is removed before a quenching process, the decarburization in a quenching process can be suppressed. As a result, it is possible to suppress the decrease in surface hardness while suppressing the occurrence of uneven carburization by the oxide film in the carburizing process.
本発明の浸炭部品の製造方法によれば、浸炭ムラの発生および表面硬度の低下を抑止することができる。 According to the manufacturing how the carburized component of the present invention, it is possible to suppress the reduction in the generation and surface hardness of the carburized unevenness.
以下、本発明の一実施の形態について図面に基づいて説明する。
図１は、本発明の一実施の形態における浸炭部品の製造方法を工程順に示す図である。図１を参照して、始めに、３．５質量％以上のＣｒを含む鋼を準備し、この鋼に対して高温酸化処理を施す（ステップＳ１）。これにより、鋼の表面に酸化膜が形成される。高温酸化処理は、たとえば９００℃以上１０００℃以下の大気中に鋼を保持することにより行なわれる。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a method for manufacturing a carburized component according to an embodiment of the present invention in the order of steps. With reference to FIG. 1, first, steel containing 3.5 mass% or more of Cr is prepared, and this steel is subjected to high-temperature oxidation treatment (step S1). Thereby, an oxide film is formed on the surface of the steel. The high temperature oxidation treatment is performed, for example, by holding the steel in the atmosphere of 900 ° C. or higher and 1000 ° C. or lower.
次に、鋼を浸炭処理する（ステップＳ２）。浸炭処理は、たとえばＣＰ（カーボンポテンシャル）が０．６の雰囲気で、９６０℃の温度で３６時間行なわれる。浸炭処理方法は、固体浸炭、液体浸炭、ガス浸炭、または真空浸炭などいずれでもよい。浸炭処理の際には、鋼の表面に酸化膜が形成されているので、鋼の表面におけるどの位置からも均一な深さで炭素を侵入させることができ、浸炭ムラの発生を抑止することができる。その後、この鋼を浸炭処理温度から冷却することによって、鋼に対して１次焼入が施される。 Next, the steel is carburized (step S2). The carburizing process is performed for 36 hours at a temperature of 960 ° C. in an atmosphere having a CP (carbon potential) of 0.6, for example. The carburizing method may be any of solid carburizing, liquid carburizing, gas carburizing, or vacuum carburizing. During carburizing treatment, an oxide film is formed on the surface of the steel, so that carbon can penetrate at a uniform depth from any position on the surface of the steel, and the occurrence of carburizing unevenness can be suppressed. it can. Thereafter, the steel is cooled from the carburizing temperature to be subjected to primary quenching.
次に、鋼の表面に形成された酸化膜（スケール）を除去する（ステップＳ３）。スケールの除去方法としては、旋削、ラッピング、タンブラーなどの機械加工を用いる方法であってもよいし、電解研磨のような化学研磨を用いる方法であってもよい。 Next, the oxide film (scale) formed on the steel surface is removed (step S3). The scale removal method may be a method using machining such as turning, lapping, or tumbler, or a method using chemical polishing such as electrolytic polishing.
次に、鋼に対して２次焼入を施す（ステップＳ４）。２次焼入は、１１００℃の真空炉において２０分間保持した後で冷却することにより行なわれる。ここで、２次焼入の際に鋼の表面に酸化膜が形成されていると、酸化膜の成分が鋼の表面の炭素と結びつき、ガスとして放出される。その結果、鋼の脱炭が起こり、鋼の表面硬度の低下を招く。しかし本実施の形態では、酸化膜が除去された鋼に対して２次焼入を施すので、酸化膜による鋼の脱炭は起こらない。 Next, secondary quenching is performed on the steel (step S4). Secondary quenching is performed by holding for 20 minutes in a vacuum furnace at 1100 ° C. and then cooling. Here, if an oxide film is formed on the surface of the steel during the secondary quenching, components of the oxide film are combined with carbon on the surface of the steel and released as a gas. As a result, decarburization of the steel occurs and the surface hardness of the steel is reduced. However, in this embodiment, since the secondary quenching is performed on the steel from which the oxide film has been removed, the decarburization of the steel by the oxide film does not occur.
その後、鋼に焼戻を施してもよい。以上の工程により、本実施の形態の浸炭部品が得られる。 Thereafter, the steel may be tempered. Through the above steps, the carburized component of the present embodiment is obtained.
本実施の形態における浸炭方法は、３．５質量％以上のＣｒを含む鋼の表面に酸化膜を形成する酸化工程（ステップＳ１）と、酸化工程後、鋼を浸炭する浸炭工程（ステップＳ２）と、浸炭工程後、鋼の表面から酸化膜を除去する除去工程（ステップＳ３）と、除去工程後、鋼を焼入れる焼入工程（ステップＳ４）とを備えている。 The carburizing method according to the present embodiment includes an oxidation process (step S1) for forming an oxide film on the surface of steel containing 3.5% by mass or more of Cr, and a carburizing process for carburizing steel after the oxidation process (step S2). And a removal step (step S3) for removing the oxide film from the surface of the steel after the carburizing step, and a quenching step (step S4) for quenching the steel after the removal step.
本実施の形態における浸炭方法およびこれを用いて製造された浸炭部品によれば、鋼の表面に酸化膜を形成してから浸炭処理を施すので、浸炭ムラの発生を抑止することができる。加えて、酸化膜が除去された鋼に対して２次焼入を施すので、酸化膜の成分による鋼の脱炭を抑止することができ、鋼の表面硬度が低下するのを抑止することができる。 According to the carburizing method and the carburized parts manufactured using the carburizing method in the present embodiment, carburizing treatment is performed after forming an oxide film on the surface of the steel, so that occurrence of carburizing unevenness can be suppressed. In addition, since secondary quenching is performed on the steel from which the oxide film has been removed, decarburization of the steel due to the components of the oxide film can be suppressed, and the reduction in the surface hardness of the steel can be suppressed. it can.
本実施例では、試験片Ａ（比較例）および試験片Ｂ（本発明例）に関して、２次焼入の際に鋼の表面から脱離するガスについて調べた。始めに、Ｃｒを含む鋼（Ｃ：０．１５質量％、Ｎｉ：３．５質量％、Ｃｒ：４質量％、Ｍｏ：４質量％、Ｖ：１質量％、残部Ｆｅ）よりなる試験片Ａおよび試験片Ｂを準備し、高温酸化処理、浸炭処理、および１次焼入を施した。高温酸化処理は９５０℃の大気中に鋼を保持することにより行なった。浸炭処理はガス浸炭により行ない、ＣＰが０．６の雰囲気で、９６０℃の温度で３６時間行なった。続いて、試験片Ｂについて鋼の表面に形成された酸化膜をラッピングにより除去した。試験片Ａについては酸化膜を除去しなかった。以上のようにして得られた１次焼入後の試験片Ａおよび試験片Ｂの各々に対して、昇温脱離ガス分析を行なった。図２は試験片Ａの昇温脱離ガス分析の結果を示す図であり、図３は試験片Ｂの昇温脱離ガス分析の結果を示す図である。 In this example, the test piece A (comparative example) and the test piece B (present invention example) were examined for gases desorbed from the steel surface during secondary quenching. First, test piece A made of steel containing Cr (C: 0.15 mass%, Ni: 3.5 mass%, Cr: 4 mass%, Mo: 4 mass%, V: 1 mass%, balance Fe) And the test piece B was prepared and the high temperature oxidation process, the carburizing process, and the primary quenching were performed. The high temperature oxidation treatment was performed by holding the steel in the atmosphere at 950 ° C. The carburizing process was performed by gas carburizing, and was performed in an atmosphere having a CP of 0.6 at a temperature of 960 ° C. for 36 hours. Subsequently, the oxide film formed on the steel surface of the test piece B was removed by lapping. For the test piece A, the oxide film was not removed. A temperature-programmed desorption gas analysis was performed on each of the specimen A and specimen B after the primary quenching obtained as described above. FIG. 2 is a diagram showing the results of the temperature-programmed desorption gas analysis of the test piece A, and FIG. 3 is a diagram showing the results of the temperature-programmed desorption gas analysis of the test piece B.
図２を参照して、試験片Ａでは試験片の温度上昇とともに大量のガスの脱離が観測された。具体的には、５００℃付近、８００℃付近および９００℃付近で質量数４４（二酸化炭素）の脱離ピークが観測され、８００℃付近および９００℃付近で質量数２８（窒素・一酸化炭素）の脱離ピークが観測された。一方図３を参照して、試験片Ｂにおいて脱離したガスの量は、試験片Ａにおいて脱離したガスの量に比べて非常に少なかった。これらの結果から、試験片Ａの２次焼入の際には、酸化膜の酸素原子が鋼の表面に存在する炭素原子と結合して、一酸化炭素および二酸化炭素が発生し、その結果鋼の脱炭が発生していることが推測される。加えて、試験片Ａでは３００℃付近で質量数１８（水）の脱離ピークが観測され、６００℃付近で質量数２（水素）の脱離ピークが観測されたことから、酸化膜における酸素以外の成分も鋼に対して何らかの悪影響を与えているものと推測される。 Referring to FIG. 2, in test piece A, a large amount of gas desorption was observed as the temperature of the test piece increased. Specifically, desorption peaks with mass number 44 (carbon dioxide) are observed at around 500 ° C., 800 ° C. and 900 ° C., and mass number 28 (nitrogen / carbon monoxide) at around 800 ° C. and 900 ° C. The desorption peak of was observed. On the other hand, referring to FIG. 3, the amount of gas desorbed in test piece B was very small compared to the amount of gas desorbed in test piece A. From these results, during the secondary quenching of the test piece A, the oxygen atoms of the oxide film are combined with the carbon atoms present on the surface of the steel to generate carbon monoxide and carbon dioxide. As a result, the steel It is speculated that decarburization has occurred. In addition, in specimen A, a desorption peak with a mass number of 18 (water) was observed near 300 ° C., and a desorption peak with a mass number of 2 (hydrogen) was observed near 600 ° C., so that oxygen in the oxide film was observed. It is presumed that the other components have some adverse effects on the steel.
本実施の形態においては、２次焼入後の試験片Ａおよび試験片Ｂに関して、深さ方向の硬度分布について調べた。すなわち、実施例１で得られた１次焼入後の試験片Ａおよび試験片Ｂの各々に対して２次焼入を施した。２次焼入は１１００℃の真空炉において２０分間保持した後で冷却することにより行なった。以上のようにして試験片Ａおよび試験片Ｂの各々の浸炭部品を得た。続いて、試験片Ａおよび試験片Ｂの各々の断面において、深さ方向に沿ってビッカース硬度（ＨＶ）を測定した。図４は試験片Ａの深さ方向の硬度分布を示す図であり、図５は試験片Ｂの深さ方向の硬度分布を示す図である。 In the present embodiment, the hardness distribution in the depth direction was examined for the test piece A and the test piece B after secondary quenching. That is, secondary quenching was performed on each of the specimen A and specimen B after the primary quenching obtained in Example 1. Secondary quenching was performed by holding in a vacuum furnace at 1100 ° C. for 20 minutes and then cooling. The carburized parts of each of the test piece A and the test piece B were obtained as described above. Subsequently, in each cross section of the test piece A and the test piece B, Vickers hardness (HV) was measured along the depth direction. 4 is a diagram showing the hardness distribution of the test piece A in the depth direction, and FIG. 5 is a diagram showing the hardness distribution of the test piece B in the depth direction.
図４および図５を参照して、試験片Ａの硬度は、表面から約０．８ｍｍの部分が最も高くなっており、表面に近づく程低下している。一方、試験片Ｂの硬度は、表面に最も近い部分が最も高くなっており、表面から離れる程低下している。これらの結果から、試験片Ａでは２次焼入れの際の脱炭により表面硬度が低下しているのに対して、試験片Ｂでは表面硬度の低下が抑制されていることが分かる。 Referring to FIGS. 4 and 5, the hardness of test piece A is highest at a portion of about 0.8 mm from the surface, and decreases as it approaches the surface. On the other hand, the hardness of the test piece B is highest at the portion closest to the surface, and decreases as the distance from the surface increases. From these results, it can be seen that the test piece A has a reduced surface hardness due to decarburization during secondary quenching, whereas the test piece B has a reduced decrease in surface hardness.
以上に開示された実施の形態および実施例はすべての点で例示であって制限的なものではないと考慮されるべきである。本発明の範囲は、以上の実施の形態および実施例ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての修正や変形を含むものと意図される。 The embodiments and examples disclosed above are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments and examples but by the scope of claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the scope of claims. .
本発明の浸炭方法およびそれによって製造された浸炭部品は、軸受部品の浸炭方法およびそれによって製造された軸受部品に適している。 The carburizing method of the present invention and the carburized part manufactured thereby are suitable for the carburizing method of the bearing part and the bearing part manufactured thereby.
Claims (3)
前記酸化工程後、前記鋼を浸炭する浸炭工程と、
前記浸炭工程後、前記鋼の表面から前記酸化膜を除去する除去工程と、
前記除去工程後、前記鋼を焼入れる焼入工程とを備える、浸炭部品の製造方法。 An oxidation step of forming an oxide film on the surface of steel containing 3.5 mass% or more of Cr;
After the oxidation step, carburizing step of carburizing the steel,
After the carburizing step, a removal step of removing the oxide film from the surface of the steel;
A carburized part manufacturing method comprising a quenching step of quenching the steel after the removing step.
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