JPH11229114A - Surface hardening method for austenitic stainless steel - Google Patents

Surface hardening method for austenitic stainless steel

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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
Application number
JP2828398A
Other languages
Japanese (ja)
Inventor
Shigeru Igarashi
茂 五十嵐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Metal Mining Co Ltd
Original Assignee
Sumitomo Metal Mining Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP2828398A priority Critical patent/JPH11229114A/en
Publication of JPH11229114A publication Critical patent/JPH11229114A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a surface hardening method for an austenitic stainless steel having corrosion resistance more excellent than that of a conventional one and further excellent in wear resistance. SOLUTION: This surface hardening method is the one in which a member of an austenitic stainless steel or a member of an austenitic stainless steel subjected to surface hardening treatment by a conventional method is held at a temp. of 300 to 500 deg.C, and the surface of the member is subjected to glow discharge in an atmosphere in which gaseous ammonia and gaseous hydrogen are present and is subjected to ion nitriding.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【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
2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)

【特許請求の範囲】[Claims] 【請求項1】 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.
【請求項2】 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.
JP2828398A 1998-02-10 1998-02-10 Surface hardening method for austenitic stainless steel Pending JPH11229114A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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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