JPH11229114A - Surface hardening method for austenitic stainless steel - Google Patents
Surface hardening method for austenitic stainless steelInfo
- Publication number
- JPH11229114A JPH11229114A JP2828398A JP2828398A JPH11229114A JP H11229114 A JPH11229114 A JP H11229114A JP 2828398 A JP2828398 A JP 2828398A JP 2828398 A JP2828398 A JP 2828398A JP H11229114 A JPH11229114 A JP H11229114A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- austenitic stainless
- surface hardening
- present
- nitriding
- 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
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐摩耗性と耐食性
に優れたオーステナイト系ステンレス鋼の表面硬化方法
に関し、特に、その表面硬度を８００ＨＶ０．１以上と
する、耐食性、耐摩耗性に優れたオーステナイト系ステ
ンレス鋼の表面硬化方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for hardening a surface of an austenitic stainless steel having excellent wear resistance and corrosion resistance. The present invention relates to a surface hardening method for austenitic stainless steel.
【０００２】[0002]
【従来の技術】オーステナイト系ステンレス鋼は各種装
置、配管、部品等に用いられている。この鋼種は、ロス
トワックス法、機械加工などで部品形状に加工される。
近年は機械部品にも用いるため、耐摩耗性、耐食性に優
れたものが求められている。2. Description of the Related Art Austenitic stainless steel is used for various devices, pipes, parts and the like. This steel type is processed into a part shape by a lost wax method, machining, or the like.
In recent years, a material having excellent wear resistance and corrosion resistance has been demanded for use in machine parts.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の表面硬
化されたオーステナイト系ステンレス鋼は、最表面のス
テンレスの組成が変化するため、耐食性が低かった。However, the conventional surface-hardened austenitic stainless steel has a low corrosion resistance because the composition of the outermost stainless steel changes.
【０００４】そこで本発明は、耐食性が従来よりも優
れ、しかも耐摩耗性に優れたオーステナイト系ステンレ
ス鋼の表面硬化方法を提供する。Accordingly, the present invention provides a method for hardening the surface of austenitic stainless steel which is more excellent in corrosion resistance and more excellent in wear resistance.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
の本発明のオーステナイト系ステンレス鋼の表面硬化方
法は、オーステナイト系ステンレス鋼の部材を３００〜
５００℃の温度に保持し、アンモニアガスと水素ガスが
存在する雰囲気中で部材表面にグロー放電を行い、該部
材表面をイオン窒化することを特徴とするまた、本発明
の他のオーステナイト系ステンレス鋼の表面硬化方法
は、従来の公知の方法で表面硬化処理したオーステナイ
ト系ステンレス鋼の部材を用い、これを３００〜５００
℃の温度に保持し、アンモニアガスと水素ガスが存在す
る雰囲気中で部材表面にグロー放電を行い、該部材表面
をイオン窒化することを特徴とする。According to the present invention, there is provided a method for hardening the surface of austenitic stainless steel according to the present invention.
Another austenitic stainless steel according to the present invention, characterized in that a glow discharge is performed on the member surface in an atmosphere in which ammonia gas and hydrogen gas are present, and the member surface is ion-nitrided, while maintaining the temperature at 500 ° C. The surface hardening method uses an austenitic stainless steel member surface hardened by a conventionally known method,
The method is characterized in that a glow discharge is performed on a member surface in an atmosphere in which an ammonia gas and a hydrogen gas are present, while maintaining the temperature at ° C., and the member surface is ion-nitrided.
【０００６】[0006]
【発明の実施の形態】従来の窒化処理、例えばイオン窒
化では、耐食性を損なわない硬化層の上に耐食性を損な
う化合物層が形成される。これは、イオン窒化では印加
電圧が非常に高く、表面硬化層を耐食性を損なわない硬
化層のみに制御できないからである。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a conventional nitriding treatment, for example, ion nitriding, a compound layer that impairs corrosion resistance is formed on a hardened layer that does not impair corrosion resistance. This is because in the case of ion nitriding, the applied voltage is extremely high, and the surface hardened layer cannot be controlled only to a hardened layer that does not impair the corrosion resistance.
【０００７】従来、オーステナイト系ステンレス鋼を窒
化処理すると、耐食性を損なわない硬化層だけを生成さ
せるのは困難であると考えられた。しかし、本発明の方
法では、耐食性を損なわないＦｅ3Ｎのみの硬化層だけ
が生成され、表面硬度が８００ＨＶ０．１以上となる。
このＦｅ3Ｎのみの硬化膜は従来のイオン窒化では得ら
れない。Ｆｅ3Ｎのみで構成される硬化膜が最表面に得
られることで、高硬度、高耐食性ステンレス鋼が得られ
る。Hitherto, it has been considered that it is difficult to form only a hardened layer that does not impair corrosion resistance when nitriding austenitic stainless steel. However, according to the method of the present invention, only a hardened layer of only Fe 3 N that does not impair the corrosion resistance is generated, and the surface hardness is 800 HV0.1 or more.
This cured film of Fe 3 N alone cannot be obtained by conventional ion nitriding. By obtaining a hardened film composed only of Fe 3 N on the outermost surface, a high hardness and high corrosion resistance stainless steel can be obtained.
【０００８】本発明が対象とするオーステナイト系ステ
ンレス鋼には、ＳＵＳ３０４、ＳＵＳ３１６などがあ
る。部材を３００〜５００℃の温度に保持するのは、イ
オン窒化を可能とするためであり、３００℃未満ではイ
オン窒化が起きにくいからである。また、５００℃を超
えると、硬化後の耐食性が低下するからである。Austenitic stainless steels to which the present invention is directed include SUS304 and SUS316. The reason why the member is maintained at a temperature of 300 to 500 ° C. is to enable ion nitriding, and if the temperature is lower than 300 ° C., ion nitriding hardly occurs. On the other hand, if the temperature exceeds 500 ° C., the corrosion resistance after curing decreases.
【０００９】アンモニアガスと水素ガスが存在する雰囲
気中でグロー放電を行うのは、窒素原子、若しくは窒素
イオンが部材表面より侵入しやすくするためである。こ
こでグロー放電の電流密度は、０．００１〜２ｍＡ／ｃ
ｍ2の範囲で行うべきことは従来から知られている。The reason why glow discharge is performed in an atmosphere in which ammonia gas and hydrogen gas are present is to make it easier for nitrogen atoms or nitrogen ions to enter the surface of the member. Here, the current density of the glow discharge is 0.001 to 2 mA / c.
What should be done in the range of m 2 is conventionally known.
【００１０】本発明では、予め公知の方法で表面硬化処
理したオーステナイト系ステンレス鋼も対象とすること
ができるが、公知の表面硬化処理方法には、浸炭焼き入
れ、従来のイオン窒化処理等がある。In the present invention, austenitic stainless steel surface-hardened in advance by a known method can be used, but known surface hardening methods include carburizing and quenching and conventional ion nitriding. .
【００１１】[0011]
【実施例】実施例１ ・・・ 本発明の方法で表面硬化
した高耐食性オーステナイト系ステンレス鋼を得た。試
料にはＳＵＳ３０４のテストピースを用い、直径１ｍ、
高さ１ｍのラジカル窒化専用炉内にテストピースを設置
した。グロー放電は、保持温度３００℃、保持時間８時
間、印加電圧４００Ｖ、窒化は、保持温度３００℃、保
持時間２４時間、印加電圧５００Ｖでラジカル窒化し
た。Example 1 A high corrosion resistant austenitic stainless steel surface-hardened by the method of the present invention was obtained. Using a SUS304 test piece for the sample, diameter 1m,
The test piece was set in a 1 m-high furnace dedicated to radical nitriding. In glow discharge, radical nitriding was performed at a holding temperature of 300 ° C., a holding time of 8 hours, and an applied voltage of 400 V, and nitriding was performed at a holding temperature of 300 ° C., a holding time of 24 hours, and an applied voltage of 500 V.
【００１２】このように表面硬化したテストピースと、
表面硬化前のテストピースについて、表面硬度の測定、
硬化層厚さの測定、ＪＩＳ Ｚ ２３７１に準拠する塩
水噴霧試験を行った。結果は表１のようになった。[0012] The test piece thus surface-hardened,
Measurement of surface hardness of test pieces before surface hardening,
The measurement of the thickness of the hardened layer and the salt spray test based on JIS Z2371 were performed. The results are as shown in Table 1.
【００１３】[0013]
【表１】 [Table 1]
【００１４】実施例２ ・・・ 試料がＳＵＳ３１６で
あること以外は実施例１と同様に表面硬化処理、測定を
行った。結果は表２のようになった。Example 2 Surface hardening treatment and measurement were performed in the same manner as in Example 1 except that the sample was SUS316. The results are shown in Table 2.
【００１５】[0015]
【表２】 [Table 2]
【００１６】実施例３ ・・・ 窒化の保持温度が５０
０℃であること以外は実施例１と同様に表面硬化処理、
測定を行った。結果は表３のようになった。Example 3 ... Nitriding holding temperature is 50
Surface hardening treatment as in Example 1 except that the temperature is 0 ° C.
A measurement was made. The results are shown in Table 3.
【００１７】[0017]
【表３】 [Table 3]
【００１８】実施例４ ・・・ 試料がＳＵＳ３１６で
あること、窒化の保持温度が５００℃であること以外は
実施例１と同様に表面硬化処理、測定を行った。結果は
表４のようになった。Example 4 A surface hardening treatment and measurement were performed in the same manner as in Example 1 except that the sample was SUS316 and the holding temperature for nitriding was 500 ° C. The results were as shown in Table 4.
【００１９】[0019]
【表４】 [Table 4]
【００２０】比較例１ ・・・ 窒化の保持温度が２０
０℃であること以外は実施例１と同様に表面硬化処理、
測定を行った。結果は表５のようになった。Comparative Example 1 ... Nitriding holding temperature is 20
Surface hardening treatment as in Example 1 except that the temperature is 0 ° C.
A measurement was made. The results are shown in Table 5.
【００２１】[0021]
【表５】 [Table 5]
【００２２】比較例２ ・・・ 窒化の保持温度が２０
０℃であること以外は実施例１と同様に表面硬化処理、
測定を行った。結果は表６のようになった。Comparative Example 2 ... Nitriding holding temperature is 20
Surface hardening treatment as in Example 1 except that the temperature is 0 ° C.
A measurement was made. The results were as shown in Table 6.
【００２３】[0023]
【表６】 [Table 6]
【００２４】実施例５ ・・・ 実施例１と同じＳＵＳ
３０４の試料に、８００℃で浸炭焼き入れ処理したもの
を試料とし、実施例１と同様に表面硬化処理、測定を行
った。結果は表７のようになった。Embodiment 5: SUS same as in Embodiment 1
Sample 304 was subjected to carburizing and quenching at 800 ° C., and subjected to surface hardening and measurement in the same manner as in Example 1. The results were as shown in Table 7.
【００２５】[0025]
【表７】 [Table 7]
【００２６】なお、表面硬度ＨＶ０．１の値が大きいほ
ど耐摩耗性に優れているといえる。It can be said that the larger the value of the surface hardness HV0.1, the better the abrasion resistance.
【００２７】[0027]
【発明の効果】本発明の表面硬化方法によれば、耐食性
が従来のイオン窒化よりも優れ、しかも耐摩耗性に優れ
たオーステナイト系ステンレス鋼が得られる。According to the surface hardening method of the present invention, an austenitic stainless steel having better corrosion resistance than conventional ion nitriding and excellent wear resistance can be obtained.
Claims (2)
３００〜５００℃の温度に保持し、アンモニアガスと水
素ガスが存在する雰囲気中で部材表面にグロー放電を行
い、該部材表面をイオン窒化することを特徴とするオー
ステナイト系ステンレス鋼の表面硬化方法。An austenitic stainless steel member is maintained at a temperature of 300 to 500 ° C., and a glow discharge is performed on the member surface in an atmosphere in which an ammonia gas and a hydrogen gas are present to ion-nitride the member surface. Characteristic surface hardening method for austenitic stainless steel.
ンレス鋼の部材を３００〜５００℃の温度に保持し、ア
ンモニアガスと水素ガスが存在する雰囲気中で部材表面
にグロー放電を行い、該部材表面をイオン窒化すること
を特徴とするオーステナイト系ステンレス鋼の表面硬化
方法。2. A surface hardened austenitic stainless steel member is maintained at a temperature of 300 to 500 ° C., and a glow discharge is performed on the member surface in an atmosphere in which ammonia gas and hydrogen gas are present. A surface hardening method for austenitic stainless steel, characterized by nitriding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2828398A JPH11229114A (en) | 1998-02-10 | 1998-02-10 | Surface hardening method for austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2828398A JPH11229114A (en) | 1998-02-10 | 1998-02-10 | Surface hardening method for austenitic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11229114A true JPH11229114A (en) | 1999-08-24 |
Family
ID=12244286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2828398A Pending JPH11229114A (en) | 1998-02-10 | 1998-02-10 | Surface hardening method for austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11229114A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272978A (en) * | 2004-03-26 | 2005-10-06 | Sdc:Kk | Surface structure of austenitic stainless steel |
| JP2007016273A (en) * | 2005-07-07 | 2007-01-25 | Nippon Denshi Kogyo Kk | Hierarchical surface reforming process of austenitic stainless steel component |
| JP2008133542A (en) * | 2007-12-07 | 2008-06-12 | Seiko Epson Corp | Surface treatment method for ornament, and ornament |
| EP2103698A1 (en) | 2008-03-17 | 2009-09-23 | Seiko Epson Corporation | Method of manufacturing a decorative article, a decorative article, and a timepiece |
| JP2019119927A (en) * | 2017-12-28 | 2019-07-22 | ワークソリューション株式会社 | Stainless steel product, and manufacturing method of stainless steel product |
-
1998
- 1998-02-10 JP JP2828398A patent/JPH11229114A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272978A (en) * | 2004-03-26 | 2005-10-06 | Sdc:Kk | Surface structure of austenitic stainless steel |
| JP4505246B2 (en) * | 2004-03-26 | 2010-07-21 | 株式会社エスディーシー | Formation method of hardened surface of corrosion resistant and wear resistant austenitic stainless steel |
| JP2007016273A (en) * | 2005-07-07 | 2007-01-25 | Nippon Denshi Kogyo Kk | Hierarchical surface reforming process of austenitic stainless steel component |
| JP2008133542A (en) * | 2007-12-07 | 2008-06-12 | Seiko Epson Corp | Surface treatment method for ornament, and ornament |
| EP2103698A1 (en) | 2008-03-17 | 2009-09-23 | Seiko Epson Corporation | Method of manufacturing a decorative article, a decorative article, and a timepiece |
| JP2019119927A (en) * | 2017-12-28 | 2019-07-22 | ワークソリューション株式会社 | Stainless steel product, and manufacturing method of stainless steel product |
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