JPH073392A - Steel for nitriding - Google Patents
Steel for nitridingInfo
- Publication number
- JPH073392A JPH073392A JP14802493A JP14802493A JPH073392A JP H073392 A JPH073392 A JP H073392A JP 14802493 A JP14802493 A JP 14802493A JP 14802493 A JP14802493 A JP 14802493A JP H073392 A JPH073392 A JP H073392A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- nitriding
- less
- wear resistance
- present
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗性に優れた迅速
窒化用鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel for rapid nitriding having excellent wear resistance.
【０００２】[0002]
【従来の技術】鋼の表面硬化処理方法の一つとして窒化
処理がある。この窒化処理は同じ表面硬化処理方法であ
る高周波焼入れや浸炭焼入れに比べて熱処理歪が小さい
ため、有効な表面硬化処理法として広く利用されてい
る。2. Description of the Related Art Nitriding is one of the methods for hardening the surface of steel. This nitriding treatment is widely used as an effective surface hardening treatment method because it has a smaller heat treatment distortion than the same surface hardening method, which is induction hardening or carburizing hardening.
【０００３】窒化処理用鋼材としては、一般的には、機
械構造用炭素鋼（ＪＩＳＧ４０５１）やクロムモリブデ
ン鋼（ＪＩＳＧ４１０５）が用いられるが、アルミニウ
ム・クロム・モリブデン鋼（ＪＩＳＧ４２０２）のよう
な窒化用鋼が用いられる場合もある。しかし、いずれの
鋼種も、一般的な窒化処理では硬化深さが浅く、耐摩耗
性に問題を生じることがあった。As the nitriding steel material, carbon steel for machine structure (JISG4051) and chrome molybdenum steel (JISG4105) are generally used. May be used. However, in any of the steel types, a general nitriding treatment has a small hardening depth, which may cause a problem in wear resistance.
【０００４】これを改善するため、特公昭５５−３１１
６８号公報では、Ｃｒ−Ｍｏ−Ｖ添加鋼を溶体化後、窒
化することによって表面硬さ及び有効硬化深さの向上を
図っている。In order to improve this, Japanese Examined Patent Publication No. 55-311
In Japanese Patent No. 68, the Cr-Mo-V-added steel is solutionized and then nitrided to improve the surface hardness and the effective hardening depth.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、特公昭
５５−３１１６８号公報に開示された技術では、窒化時
に析出強化を利用することに重点を置いているため窒化
時間が長いこと、また、Ａｌは対摩耗性向上に有効な元
素であるものの、窒化性及び析出硬化性の少なくとも一
方を損なうので使用されていないこと等、未だ改善すべ
き余地が残されている。However, in the technique disclosed in Japanese Patent Publication No. 55-31168, since the emphasis is on utilizing precipitation strengthening during nitriding, the nitriding time is long, and Al is Although it is an element effective in improving wear resistance, it is not used because it impairs at least one of nitriding property and precipitation hardening property, and there is still room for improvement.
【０００６】本発明はかかる事情に鑑みてなされたもの
であって、短時間の窒化処理で優れた耐摩耗性を示す窒
化用鋼を提供することを目的とする。具体的には、２４
時間以内の窒化処理で、ＨV ７５０の深さが０．２５ｍ
ｍ以上となる耐摩耗性に優れた迅速窒化用鋼を提供する
ことを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a nitriding steel exhibiting excellent wear resistance by a short-time nitriding treatment. Specifically, 24
In nitriding treatment within the time, the depth of the H V 750 is 0.25m
It is an object of the present invention to provide a steel for rapid nitriding having a wear resistance of m or more and excellent in wear resistance.
【０００７】[0007]
【課題を解決するための手段及び作用】本発明は、重量
％で、Ｃ：０．２５％超え、０．３５％未満、Ｓｉ：
０．０５〜１．０％、Ｍｎ：０．１〜１．０％、Ｓ：
０．１０％以下、Ｃｒ：１．０％超え、２．０％以下、
Ｍｏ：１．５％超え、２．５％以下、Ｖ：０．３〜０．
６％、Ａｌ：０．２０％以上、０．３０％未満以下、を
含有し、残部がＦｅおよび不可避的不純物からなること
を特徴とする窒化用鋼を提供する。Means for Solving the Problems and Actions The present invention provides, by weight%, C: more than 0.25% and less than 0.35%, Si:
0.05-1.0%, Mn: 0.1-1.0%, S:
0.10% or less, Cr: more than 1.0%, 2.0% or less,
Mo: over 1.5%, 2.5% or less, V: 0.3-0.
Provided is a nitriding steel containing 6%, Al: 0.20% or more and less than 0.30% or less, and the balance being Fe and inevitable impurities.
【０００８】本願発明者らは、短時間の窒化処理で優れ
た耐摩耗性を示す迅速窒化用鋼を得るべく鋭意研究を行
った結果、Ｍｏ及びＶを多量に添加すると共にＡｌを適
量添加することにより、２４時間以内の窒化処理で、Ｈ
V ７５０の深さが０．２５ｍｍ以上となり、耐摩耗性に
優れることを見出した。The inventors of the present invention have conducted earnest studies to obtain a steel for rapid nitriding exhibiting excellent wear resistance in a short-time nitriding treatment. As a result, a large amount of Mo and V are added and an appropriate amount of Al is added. As a result, H
It was found that the depth of V 750 was 0.25 mm or more and the wear resistance was excellent.
【０００９】上記構成の本発明は、本願発明者らのこの
ような知見に基づいてなされたものである。以下、本発
明の成分限定範囲とその限定理由を示す。なお、以下に
示す％表示は、いずれも重量％を示すものである。The present invention having the above-described structure is made based on the knowledge of the present inventors. Hereinafter, the component limitation range of the present invention and the reason for the limitation will be shown. In addition, all the% indications shown below show% by weight.
【００１０】Ｃ：強度確保のため必要な元素であり、こ
の観点から０．２５％を超えることが必要である。しか
し、その量が０．３５％を超えると靱性が低下する。従
ってＣ含有量を０．２５％超え、０．４５％以下の範囲
に規定する。C: An element necessary for securing strength, and from this viewpoint, it is necessary to exceed 0.25%. However, if the amount exceeds 0.35%, the toughness decreases. Therefore, the C content is specified in the range of 0.25% to 0.45%.
【００１１】Ｓｉ：脱酸に必要であるとともに強度確保
に必要な元素であるが、０．０５％未満では所望の効果
が得られない。一方、その量が１．０％を超えると靱性
が低下する。従ってＳｉ含有量を０．０５〜１．０％の
範囲に規定する。Si: An element required for deoxidation and for securing strength, but if less than 0.05%, the desired effect cannot be obtained. On the other hand, if the amount exceeds 1.0%, the toughness decreases. Therefore, the Si content is specified in the range of 0.05 to 1.0%.
【００１２】Ｍｎ：強度確保のため必要な元素である
が、０．１％未満では必要な強度が得られない。一方、
その量が１．０％を超えると靱性が低下する。従ってＭ
ｎ含有量を０．１〜１．０％の範囲に規定する。Mn: an element necessary for securing strength, but if less than 0.1%, the required strength cannot be obtained. on the other hand,
If the amount exceeds 1.0%, the toughness decreases. Therefore M
The n content is specified in the range of 0.1 to 1.0%.
【００１３】Ｓ：被削性改善のために必要な元素であ
り、強度レベルに応じて適宜添加される。しかし、その
量が０．１％を超えるとＭｎＳの量、サイズが増大し、
靭性が低下する。従ってＳ量を０．１％以下に規定す
る。S: An element necessary for improving machinability, and is appropriately added depending on the strength level. However, if the amount exceeds 0.1%, the amount and size of MnS increase,
Toughness decreases. Therefore, the S amount is specified to be 0.1% or less.
【００１４】Ｃｒ：窒化特性を向上させる元素である
が、１．０％以下ではその効果が小さい。一方、その量
が２．０％を超えると靱性が低下する。従ってＣｒ含有
量を１．０超え、２．０％以下の範囲に規定する。Cr: An element that improves nitriding characteristics, but its effect is small at 1.0% or less. On the other hand, if the amount exceeds 2.0%, the toughness decreases. Therefore, the Cr content is specified in the range of 1.0 to 2.0%.
【００１５】Ｍｏ：Ｖと複合添加することにより有効硬
化深さを著しく向上させる機能を有する。しかし、その
量が１．５％以下ではその機能を有効に発揮することが
できず、２．５％を超えると効果が飽和するとともにコ
ストアップにつながる。従ってＭｏ含有量を１．５％超
え、２．５％以下の範囲に規定する。It has a function of remarkably improving the effective hardening depth by adding it together with Mo: V. However, if the amount is 1.5% or less, the function cannot be effectively exhibited, and if it exceeds 2.5%, the effect is saturated and the cost is increased. Therefore, the Mo content is specified in the range of more than 1.5% and not more than 2.5%.
【００１６】Ｖ：Ｍｏと複合添加することにより有効硬
化深さを向上させる元素であるが、０．３％未満ではそ
の効果が不十分である。一方、その量が０．６％を超え
てもその効果が飽和する。従ってＶ含有量を０．３％以
上、０．６％以下の範囲に規定する。V: An element that improves the effective hardening depth when added together with Mo, but if it is less than 0.3%, its effect is insufficient. On the other hand, even if the amount exceeds 0.6%, the effect is saturated. Therefore, the V content is specified in the range of 0.3% to 0.6%.
【００１７】Ａｌ：Ａｌは、窒化処理時に表面硬さを上
昇させる作用を有する。要求される耐摩耗性に見合う硬
化深さを得るために十分な表面硬さにする観点から０．
２％以上が必要であるが、０．３％以上では硬化深さに
悪影響を及ぼす。従って、Ａｌ含有量を０．２％以上、
０．３％未満に規定する。Al: Al has the function of increasing the surface hardness during the nitriding treatment. From the viewpoint of making the surface hardness sufficient to obtain a hardening depth commensurate with the required wear resistance, 0.
2% or more is required, but if it is 0.3% or more, the curing depth is adversely affected. Therefore, the Al content is 0.2% or more,
Specify less than 0.3%.
【００１８】本発明の窒化用鋼は、上述のような組成を
有している限り、その製造方法は問わず、その用途に応
じて適宜製造方法が選択される。また、本発明の窒化用
鋼に窒化処理を施すに際しても、その処理方法は特に限
定されず、通常行われている窒化処理方法を適用するこ
とができる。The nitriding steel of the present invention may be produced by any method as long as it has the above-mentioned composition, regardless of its production method. Further, when the nitriding steel of the present invention is subjected to the nitriding treatment, the treating method is not particularly limited, and a commonly used nitriding treatment method can be applied.
【００１９】[0019]
【実施例】以下、本発明の実施例について説明する。表
１に示す化学成分の鋼を１５０ｋｇ真空溶解炉にて溶製
後、３０ｍｍφに熱間鍛造し、その後９５０℃×１時間
の焼ならしを行い、供試材とした。EXAMPLES Examples of the present invention will be described below. Steel having the chemical composition shown in Table 1 was melted in a 150 kg vacuum melting furnace, hot forged to 30 mmφ, and then normalizing at 950 ° C. for 1 hour was performed to obtain a test material.
【００２０】この供試材を２５ｍｍφ丸棒に切削加工
し、Ｎ2 −ＮＨ3 −ＣＯ2 雰囲気を用いたガス窒化炉に
て５８０℃で２０時間のガス窒化を行った後、硬さ試験
片を切断し、この試験片の硬さを測定した。This test material was cut into a 25 mmφ round bar, and gas nitriding was carried out at 580 ° C. for 20 hours in a gas nitriding furnace using an N 2 —NH 3 —CO 2 atmosphere. Was cut, and the hardness of this test piece was measured.
【００２１】表１に表面硬さ、硬化深さを合わせて示
す。表１中表面硬さは、表面から０．０５ｍｍ位置の硬
さ、硬化深さはＨV ７５０となる距離で評価した。な
お、番号１〜４は本発明の範囲内の組成である実施例、
番号５〜９は本発明の範囲から外れる比較例であり、さ
らに番号１０は従来例であり、ＪＩＳのＳＡＣＭ６４５
である。Table 1 shows the surface hardness and the curing depth together. In Table 1, the surface hardness was evaluated at a hardness of 0.05 mm from the surface, and the curing depth was evaluated as a distance of H V 750. It should be noted that Nos. 1 to 4 are examples having compositions within the scope of the present invention,
Nos. 5 to 9 are comparative examples that depart from the scope of the present invention, and No. 10 is a conventional example.
Is.
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１から、本発明の範囲内の番号１〜４は
いずれも、２４時間以内の迅速窒化処理で硬化深さが
０．２５ｍｍを超え、良好な耐摩耗性を得るための条件
を満足していた。From Table 1, all of the numbers 1 to 4 within the scope of the present invention show the conditions for obtaining a good wear resistance with a hardening depth of more than 0.25 mm in the rapid nitriding treatment within 24 hours. I was satisfied.
【００２４】これに対して、比較例の番号５は本発明の
範囲よりもＣｒが低く、番号６はＭｏが低く、番号７は
Ｖが低く、番号８はＡｌが低く、いずれも硬化深さが小
さく、０．２５ｍｍ未満となった。また、比較例の番号
９とＪＩＳ窒化鋼である従来例の番号１０は、いずれも
Ａｌ量が高すぎ、表面硬さは高いものの、硬化深さは小
さかった。このように、比較例、従来例はいずれも、必
要な耐摩耗性に十分な硬化深さが得られなかった。On the other hand, in Comparative Example No. 5, Cr is lower than in the range of the present invention, No. 6 is low in Mo, No. 7 is low in V, and No. 8 is low in Al. Was less than 0.25 mm. Further, in Comparative Example No. 9 and JIS Nitride Steel No. 10 in Conventional Example, the Al amount was too high and the surface hardness was high, but the hardening depth was small. As described above, neither the comparative example nor the conventional example was able to obtain a sufficient hardening depth for the required wear resistance.
【００２５】[0025]
【発明の効果】以上のように、本発明によれば、２４時
間以内の迅速窒化処理で、ＨV ７５０となる深さが０．
２５ｍｍ以上となり、短時間の窒化処理で優れた耐摩耗
性が得られる窒化用鋼が提供される。As is evident from the foregoing description, according to the present invention, a rapid nitriding treatment within 24 hours, the depth of the H V 750 is 0.
A steel for nitriding having a thickness of 25 mm or more and having excellent wear resistance by a short-time nitriding treatment is provided.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 信行 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (72)発明者 石黒 守幸 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (72)発明者 椛澤 均 埼玉県蓮田市大字閏戸2358−１ 株式会社 日本テクノ内 (72)発明者 桑原 美博 新潟県長岡市下条町777番地 長岡電子株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Ishikawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Morikoyuki Ishiguro 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Co., Ltd. (72) Inventor Hitoshi Kabazawa 2358-1 Hashida, Saitama Prefecture, Japan Techno Techno Co., Ltd. (72) Inventor Mihiro Kuwahara 777 Shimojocho, Nagaoka, Niigata Nagaoka Electronics Co., Ltd.
Claims (1)
５％未満、Ｓｉ：０．０５〜１．０％、Ｍｎ：０．１〜
１．０％、Ｓ：０．１０％以下、Ｃｒ：１．０超え、
２．０％以下、Ｍｏ：１．５超え、２．５％以下、Ｖ：
０．３〜０．６％、Ａｌ：０．２０％以上、０．３０％
未満、を含有し、残部がＦｅおよび不可避的不純物から
なることを特徴とする窒化用鋼。1. By weight%, C: exceeds 0.25%, 0.3
Less than 5%, Si: 0.05 to 1.0%, Mn: 0.1
1.0%, S: 0.10% or less, Cr: more than 1.0,
2.0% or less, Mo: more than 1.5, 2.5% or less, V:
0.3-0.6%, Al: 0.20% or more, 0.30%
A nitriding steel containing less than, and the balance consisting of Fe and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14802493A JPH073392A (en) | 1993-06-18 | 1993-06-18 | Steel for nitriding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14802493A JPH073392A (en) | 1993-06-18 | 1993-06-18 | Steel for nitriding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH073392A true JPH073392A (en) | 1995-01-06 |
Family
ID=15443407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14802493A Pending JPH073392A (en) | 1993-06-18 | 1993-06-18 | Steel for nitriding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073392A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6353448A (en) * | 1986-08-23 | 1988-03-07 | Horiba Ltd | Coloring absorption analysis |
| FR2783840A1 (en) * | 1998-09-30 | 2000-03-31 | Aubert & Duval Sa | STEEL ALLOWING HIGH NITRURATION KINETICS, PROCESS FOR OBTAINING SAME AND PARTS FORMED THEREFROM |
| US7775728B2 (en) | 2006-03-31 | 2010-08-17 | Nidec Copal Corporation | Focal plane shutter for cameras |
| JP2019119899A (en) * | 2017-12-28 | 2019-07-22 | 愛知製鋼株式会社 | Cvt ring raw material, cvt ring member, and manufacturing method therefor |
-
1993
- 1993-06-18 JP JP14802493A patent/JPH073392A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6353448A (en) * | 1986-08-23 | 1988-03-07 | Horiba Ltd | Coloring absorption analysis |
| FR2783840A1 (en) * | 1998-09-30 | 2000-03-31 | Aubert & Duval Sa | STEEL ALLOWING HIGH NITRURATION KINETICS, PROCESS FOR OBTAINING SAME AND PARTS FORMED THEREFROM |
| WO2000018975A1 (en) * | 1998-09-30 | 2000-04-06 | Aubert & Duval | Nitriding steel, method for obtaining same and parts formed with said steel |
| US7775728B2 (en) | 2006-03-31 | 2010-08-17 | Nidec Copal Corporation | Focal plane shutter for cameras |
| US8277133B2 (en) | 2006-03-31 | 2012-10-02 | Nidec Copal Corporation | Focal plane shutter for cameras |
| JP2019119899A (en) * | 2017-12-28 | 2019-07-22 | 愛知製鋼株式会社 | Cvt ring raw material, cvt ring member, and manufacturing method therefor |
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