JP3164140B2 - Martensitic stainless steel for machine parts - Google Patents
Martensitic stainless steel for machine partsInfo
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- JP3164140B2 JP3164140B2 JP27892294A JP27892294A JP3164140B2 JP 3164140 B2 JP3164140 B2 JP 3164140B2 JP 27892294 A JP27892294 A JP 27892294A JP 27892294 A JP27892294 A JP 27892294A JP 3164140 B2 JP3164140 B2 JP 3164140B2
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- stainless steel
- present
- martensitic stainless
- machine parts
- steel
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Description
【０００１】[0001]
【産業上の利用分野】 本発明は高強度、高靱性、耐食性
等が要求される各種機械部品に用いられる高強度ステン
レス鋼に係り、特に低温靱性を向上させた機械部品用マ
ルテンサイト系ステンレス鋼に関するものである。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength stainless steel used for various machine parts requiring high strength, high toughness, corrosion resistance, etc., and particularly to a machine part for a machine part having improved low-temperature toughness. It is related to a rutensitic stainless steel.
【０００２】[0002]
【従来の技術】従来、コンプレッサ部品、化学プラント
部品あるいは高力ボルト等の高強度、高靱性、耐食性等
が要求される各種機械部品には比較的安価な１３Ｃｒ系
マルテンサイトステンレス鋼が多用されてきたが、これ
は比較的錆び難い上に、溶接性が悪いため、現地での補
修溶接がし難い等の欠点があった。2. Description of the Related Art Hitherto, relatively inexpensive 13Cr martensitic stainless steel has been frequently used for compressor parts, chemical plant parts, and various machine parts requiring high strength, high toughness, corrosion resistance, etc., such as high strength bolts. However, this method has the disadvantages that it is relatively hard to rust and has poor weldability, so that repair welding on site is difficult .
【０００３】そのため、最近ではこれに代わって、いわ
ゆる１７−４ＰＨ（ＪＩＳ・ＳＵＳ６３０）やＦＶ５２
０Ｂ（０．０６Ｃ−１４Ｃｒ−６Ｎｉ−２Ｍｏ−２Ｃｕ
−０．３Ｎｉ系：Ｆｉｒｔｈ Ｖｉｃｋｅｒ社規格）と
称されるマルテンサイト系析出硬化型ステンレス鋼が用
いられてきている。For this reason, recently, so-called 17-4PH (JIS SUS630) and FV52
OB (0.06C-14Cr-6Ni-2Mo-2Cu
A martensitic precipitation-hardening stainless steel called -0.3Ni-based: Standard of Ficker Vicker) has been used.
【０００４】この１７−４ＰＨは低（０．０６）Ｃ−１
７Ｃｒ−４Ｎｉ−３Ｃｕ−０．２（Ｎｂ＋Ｔａ）系の組
成を持つ高強度ステンレス鋼であり、低Ｃマルテンサイ
トの基地に微細なＣｕ−ｒｉｃｈ相を時効処理によって
析出させることで、０．２％耐力：１００Ｋｇ／ｍｍ2
以上の高強度を有すると共に、高靱性（＋２０℃の条件
下で２ｍｍＶノッチシャルピー衝撃試験特性における吸
収エネルギーが約１ｋｇｆ・ｍ）、高耐食性及び優れた
加工性（鍛造、機械加工、溶接）を発揮するものであ
る。[0004] The 17-4PH is low (0.06) C-1.
7Cr-4Ni-3Cu-0.2 (Nb + Ta) is a high-strength stainless steel having a composition of 0.2% by depositing a fine Cu-rich phase on a low C martensite matrix by aging treatment. Yield strength: 100Kg / mm 2
In addition to having the above high strength, it exhibits high toughness (absorbed energy in a 2 mm V notch Charpy impact test characteristic of about 1 kgfm at + 20 ° C), high corrosion resistance and excellent workability (forging, machining, welding) Is what you do.
【０００５】[0005]
【発明が解決しようとする課題】ところで、この１７−
４ＰＨは強度や耐食性等に優れている反面、低温靱性が
低いため、低温用機械部品材料として使用することは困
難であった。一方、ＦＶ５２０Ｂは１７−４ＰＨに比
べ、比較的優れた低温靱性を有しているが、充分とはい
えず、しかも高価なＭｏを含有しているため、それだけ
コスト高になるといった欠点があった。また、いずれの
材料も合金元素の種類が多いため、調合等の製造時に手
間がかかる上に、溶接性に関しては、従来の１３Ｃｒ系
マルテンサイトステンレス鋼に比較してやや向上してい
るものの、充分なものとはいえなかった。By the way, this 17-
4PH is excellent in strength and corrosion resistance, but has low low-temperature toughness, so that it has been difficult to use it as a low-temperature mechanical component material. On the other hand, FV520B has relatively excellent low-temperature toughness as compared with 17-4PH, but it is not sufficient, and furthermore has the disadvantage that it contains expensive Mo, so that the cost is increased accordingly. . In addition, since there are many types of alloying elements in each material, it takes time and effort in the production of preparation and the like, and the weldability is slightly improved as compared with the conventional 13Cr martensitic stainless steel, but sufficient. It wasn't.
【０００６】そこで、本発明は上記の課題を有効に解決
するために案出されたものであり、その主な目的は十分
な強度、耐食性等を有することは勿論、特に低温靱性及
び溶接性を大幅に向上させると共にコストの低減が達成
できる新規な機械部品用マルテンサイト系ステンレス鋼
を提供するものである。Accordingly, the present invention has been devised in order to effectively solve the above-mentioned problems, and the main object of the present invention is not only to have sufficient strength and corrosion resistance, but also to have particularly low temperature toughness and weldability. An object of the present invention is to provide a novel martensitic stainless steel for machine parts that can be significantly improved and cost can be reduced.
【０００７】[0007]
【課題を解決するための手段】上記課題を達成するため
に本発明は、重量％で、Ｃ：０．０１〜０．１２％、Ｓ
ｉ：１．５％以下、Ｍｎ：１．５％以下、Ｃｒ：１４．
５〜１７．４％、Ｎｉ：４．０〜６．０％、残部Ｆｅ及
び不可避的不純物からのみなり、大気中で溶製され、９
８０℃で４時間，油冷の条件で焼入れ、４７５℃で２時
間，空冷の条件で焼戻しにより針状マルテンサイトの組
織を基地とすることを特徴とする機械部品用マルテンサ
イト系ステンレス鋼を提供するものである。In order to achieve the above-mentioned object, the present invention provides a method of the present invention wherein C: 0.01 to 0.12%,
i: 1.5% or less, Mn: 1.5% or less, Cr: 14.
5 to 17.4%, Ni: 4.0 to 6.0%, the balance consisting of Fe and unavoidable impurities, melted in the atmosphere, 9
Quenching at 80 ° C for 4 hours under oil cooling conditions, 475 ° C for 2 hours
An object of the present invention is to provide a martensitic stainless steel for mechanical parts, wherein the structure of acicular martensite is used as a base by tempering under air-cooling conditions .
【０００８】すなわち、本発明者は、近年において１７
−４ＰＨとＦＶ５２０Ｂのいずれもが発揮できるような
０．２％耐力：１００Ｋｇｆ／ｍｍ2 以上の高い強度レ
ベルの使用頻度は少なくなり、現状での使用頻度の高い
０．２％耐力：６０〜１００ｋｇｆ／ｍｍ2 が発揮でき
れば充分であるとの知見に基づき、両材料の組成を鋭意
検討した結果、１６Ｃｒ−５Ｎｉ系をベースとして、強
度の向上に寄与するＣを０．０１〜０．０５％程度に減
少させると共に、析出硬化元素のＣｕ及び、炭化物生成
元素のＭｏとＮｂ無添加として、組成を単純化すること
によって低温靱性が大幅に改善されると共に、溶接性も
改善できることを見い出し、本発明に至ったものであ
る。In other words, the present inventor has recently
-4PH and none of FV520B can be exerted so that a 0.2% proof stress: frequency of use of 100 Kgf / mm 2 or more high intensity level is less, frequently used in the current 0.2% proof stress: 60 Based on the finding that it is sufficient if 100 kgf / mm 2 can be exerted, as a result of intensive studies on the composition of both materials, it was found that, based on a 16Cr-5Ni-based material, C, which contributes to the improvement in strength, was 0.1%. In addition to reducing the content to about 01 to 0.05% and adding no precipitation hardening element Cu and no carbide forming elements Mo and Nb, the low-temperature toughness is greatly improved by simplifying the composition, and the weldability is also improved. The present inventors have found that improvements can be made, leading to the present invention.
【０００９】そして、本発明において、Ｃは周知の通り
強度を得るために必要であり、その添加量を０．０１〜
０．１２重量％としたのは、０．０１重量％以下では十
分な強度が得られないからであり、０．１２重量％を超
えると強度が必要十分以上に向上して靱性に悪影響を与
えると共に、溶接性が大きく低下するためである。ま
た、Ｓｉは脱酸及びフェライト生成、基地強化のために
必要であるが、１．５重量％を超えると靱性を損なう結
果を招くことから、１．５重量％以下に抑える必要があ
り、望ましくは０．５重量％前後である。また、Ｍｎも
Ｓｉと同様な機能を発揮するが、１．５重量％超えると
アノード溶解を加速して耐食性を損なうことからＳｉと
同様に１．５重量％以下、望ましくは０．５重量％前後
である。また、Ｃｒを１４．５〜１７．４重量％、Ｎｉ
を４．０〜６．０重量％として組み合わせたのは、焼入
れの際、１０４０℃のオーステナイト化温度に加熱した
とき、ほとんどが準安定オーステナイトであり、僅かに
デルタフェライトが混在する基地をなすためである。そ
して、Ｃｒが１４．５重量％以下では耐食性が減少し、
反対に１７．４重量％を超えると１０４０℃に加熱した
とき、基地の準安定オーステナイトにおいて、第２層の
デルタフェライトの比率が急激に増加するからである。
また、Ｎｉはさらに溶接性及び靱性の改善に寄与するも
のであるが、４．０重量％以下ではその効果が現れず、
６．０重量％を超えるとＭｓ点が常温付近まで低下する
という不具合を生ずるからである。In the present invention, C is necessary for obtaining strength, as is well known, and the amount of C is 0.01 to 0.01.
0.12% by weight is less than 0.01% by weight.
This is because sufficient strength cannot be obtained, and if it exceeds 0.12% by weight , the strength is improved more than necessary and adversely affects toughness, and weldability is greatly reduced. Moreover, Si is a deoxidizing and ferrite formation, it is necessary for the base reinforcement, since it leads to results that impairs toughness exceeding 1.5 wt%, it must be kept to 1.5 wt% or less
And preferably about 0.5% by weight. Although Mn also exhibits the same function as Si, more than 1.5 wt%, 1.5 wt% Similar to Si from compromising the corrosion resistance by accelerating anode dissolution or less, preferably 0.5 wt% Before and after. Further, 14.5 to 17.4% by weight of Cr, Ni
Was combined at 4.0 to 6.0% by weight because, when heated to an austenitizing temperature of 1040 ° C. during quenching, most are metastable austenite, and form a matrix in which delta ferrite is slightly mixed. It is. When the content of Cr is 14.5% by weight or less, the corrosion resistance decreases,
Conversely, if the content exceeds 17.4% by weight, when heated to 1040 ° C., the ratio of delta ferrite in the second layer in the metastable austenite of the matrix rapidly increases.
Ni further contributes to the improvement of weldability and toughness, but its effect does not appear below 4.0% by weight.
If the content exceeds 6.0% by weight, a problem occurs that the Ms point decreases to around room temperature.
【００１０】溶製は通例の大気溶解で良く、特に真空溶
解或いは真空脱ガス等の特殊な溶解に頼る必要はない。The smelting may be performed by ordinary melting in the atmosphere, and it is not necessary to rely on special melting such as vacuum melting or vacuum degassing.
【００１１】また、熱処理は１７−４ＰＨやＦＶ５２０
Ｂよりも単純で、焼入れ焼戻しのみで良く、焼入れ条件
は、９８０℃×４時間、油冷、焼戻し条件は４７５℃×
２時間程度であり、空冷が適当である。尚、上記材料の
溶製に際して不可避的不純物の一部としてＰ及びＳが付
随的に混入する場合があるが、これらはできるだけ少な
い方が良いため、大気溶解時にその混入量を工業的に制
御できる量、すなわち、約０．０３重量％以下とするこ
とが望ましい。 The heat treatment is performed at 17-4PH or FV520.
Simpler than B, only quenching and tempering are required. The quenching conditions are 980 ° C. × 4 hours, oil cooling and tempering conditions are 475 ° C. ×
It takes about 2 hours, and air cooling is appropriate. In addition, of the above material
P and S are added as part of inevitable impurities during melting.
It may be mixed at any time, but these should be
It is better to industrially control the mixing amount when dissolving in air.
Controllable amount, that is, less than about 0.03% by weight.
Is desirable.
【００１２】[0012]
【作用】本発明は上述したような組成の材料を大気中で
溶製し、適当な条件で焼入れ焼戻して微細な針状マルテ
ンサイトの組織とすることにより、強度や耐食性等の本
来の特性を殆ど犠牲にすることなく、さらに低温靱性及
び溶接性が大幅に向上する。また、本発明のマルテンサ
イト系ステンレス鋼を構成する材料の組成は従来の１７
−４ＰＨやＦＶ５２０Ｂより単純化されているため、よ
り安価に得ることができ、かつ調合等の工程を簡略化で
きる。 According to the present invention, a material having the above composition is prepared in the atmosphere.
Melted and quenched and tempered under appropriate conditions to form a fine needle-like martensite structure , which provides strength and corrosion resistance.
Low temperature toughness and
And weldability are greatly improved. Further, the composition of the material constituting the martensitic stainless steel of the present invention is the conventional 17%.
-4PH and FV520B are simpler, so they can be obtained at lower cost, and can simplify the process such as mixing.
Wear.
【００１３】[0013]
【実施例】以下、本発明の一実施例を比較鋼と共に詳述
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail together with comparative steel.
【００１４】先ず、表１に示すような化学組成を有する
本発明鋼と、比較鋼として従来のＦＶ５２０Ｂ及び１７
−４ＰＨを用いて、それぞれ複数の試験材を作成した
後、それぞれの試験材について表２に示すような熱処理
を施して０．２％耐力をおよそ１００ｋｇｆ／ｍｍ2 と
した後、これら各試験材について引張特性を測定した。
尚、本発明鋼に係る熱処理としては、先ず、大気中で溶
製した材料を９８０℃で４時間の油焼入れした後、さら
に４７５℃で２時間焼戻し、大気中において自然冷却さ
せたものである。First, a steel of the present invention having a chemical composition as shown in Table 1 and conventional FV520B and 17 as comparative steels.
After preparing a plurality of test materials using -4PH, each test material was subjected to a heat treatment as shown in Table 2 to obtain a 0.2% proof stress of approximately 100 kgf / mm 2. Was measured for tensile properties.
As the heat treatment according to the present invention steel, first, after oil quenching of 4 hours ingot material in air at 980 ° C., further back 2 hours baked at 475 ° C., which was allowed to cool in air is there.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】この結果、表２からも明らかなように、本
発明鋼はＦＶ５２０Ｂ及び１７−４ＰＨとほぼ同様な引
張強さ、伸び及び絞り値を発揮した。 As a result, as apparent from Table 2, the steel of the present invention exhibited almost the same tensile strength, elongation and drawing value as FV520B and 17-4PH .
【００１８】次に、上記のような熱処理を施したそれぞ
れの試験鋼から２ｍｍＶノッチシャルピー衝撃試験片を
作製して−１００℃〜＋２０℃の範囲で低温衝撃試験を
行い、その結果を吸収エネルギー（ｋｇｆ・ｍ）と試験
温度（℃）に関連させて図１に示した。Next, a 2 mm V notch Charpy impact test piece was prepared from each of the heat-treated test steels and subjected to a low-temperature impact test at a temperature in the range of -100 ° C to + 20 ° C. kgfm) and the test temperature (° C) are shown in FIG.
【００１９】この結果、図１からも明らかなように、本
発明鋼の吸収エネルギーはいずれの温度域においてもＦ
Ｖ５２０Ｂ及び１７−４ＰＨよりも上回っており、非常
に優れた低温靱性を発揮した。特に−４０℃〜＋２０℃
の領域ではＦＶ５２０Ｂを大きく引き離し、その効果が
顕著に現れている。As a result, as is clear from FIG. 1, the absorbed energy of the steel of the present invention is F
V520B and 17-4PH, and exhibited extremely excellent low-temperature toughness. Especially -40 ° C to + 20 ° C
In the region, the FV520B is largely separated, and the effect is remarkable.
【００２０】次に、表２に示すような熱処理を施してビ
ッカース硬さＨｖ３３１とした試験片の顕微鏡組織図を
図２（Ａ）×１００、（Ｂ）×４００に、同じくＨｖ３
６０の比較鋼である１７−４ＰＨのそれを図２（Ｃ）×
１００に示す。これら組織図からもわかるように、図２
（Ｃ）に示す１７−４ＰＨの組織はラス状のマルテンサ
イト組織となっており、本発明鋼は焼入れ焼き戻しによ
って微細な針状マルテンサイトの組織となっており、こ
のような組織が低温靱性の改善や溶接性の向上に寄与し
ているものと考えられる。Next, the microstructures of the test pieces subjected to the heat treatment shown in Table 2 and having a Vickers hardness of Hv331 are shown in FIGS. 2 (A) × 100 and (B) × 400.
Fig. 2 (C) ×
100. As can be seen from these organization charts, FIG.
The structure of 17-4PH shown in (C) has a lath-like martensite structure, and the steel of the present invention has a structure of fine acicular martensite by quenching and tempering. It is considered that this contributes to improvement of weldability and weldability.
【００２１】[0021]
【発明の効果】以上要するに本発明によれば、以下に示
す如く優れた効果を発揮する。In summary, according to the present invention, the following excellent effects are exhibited.
【００２２】必要十分な強度、耐食性等を有し、特に
低温靱性が大幅に向上する。It has necessary and sufficient strength, corrosion resistance, etc., and particularly has a remarkably improved low-temperature toughness.
【００２３】銅や高価なモリブデン等の金属元素を省
いたため、調合が単純化されてその工程が容易となると
共に、低コスト化が達成される。Since the metal elements such as copper and expensive molybdenum are omitted, the preparation is simplified and the process becomes easy.
In both cases, cost reduction is achieved.
【００２４】鍛造性や機械加工性を犠牲にすることな
く、溶接性が大きく向上する。The weldability is greatly improved without sacrificing forgeability and machinability.
【００２５】本発明鋼の化学組成系は低温靱性を向上
させるため鋳物にも適用できる。The chemical composition of the steel of the present invention can be applied to castings to improve low-temperature toughness.
【図１】本発明鋼と比較鋼の低温靱性特性を示すグラフ
図である。FIG. 1 is a graph showing low-temperature toughness characteristics of the steel of the present invention and a comparative steel.
【図２】（Ａ）本発明鋼の組織を示す顕微鏡写真図であ
る。 （Ｂ）本発明鋼の組織を示す顕微鏡写真図である。 （Ｃ）従来鋼である１７−４ＰＨの組織を示す顕微鏡写
真図である。FIG. 2A is a micrograph showing the structure of the steel of the present invention. (B) is a micrograph showing the structure of the steel of the present invention. (C) It is a microscope photograph figure which shows the structure of 17-4PH which is a conventional steel.
Claims (1)
％、Ｓｉ：１．５％以下、Ｍｎ：１．５％以下、Ｃｒ：
１４．５〜１７．４％、Ｎｉ：４．０〜６．０％、残部
Ｆｅ及び不可避的不純物のみからなり、大気中で溶製さ
れ、９８０℃で４時間，油冷の条件で焼入れ、４７５℃
で２時間，空冷の条件で焼戻しにより針状マルテンサイ
トの組織を基地とすることを特徴とする機械部品用マル
テンサイト系ステンレス鋼。1. C: 0.01 to 0.12 by weight%
%, Si: 1.5% or less, Mn: 1.5% or less, Cr:
14.5 to 17.4%, Ni: 4.0 to 6.0%, the balance consisting only of Fe and unavoidable impurities, melted in the air , quenched at 980 ° C. for 4 hours under oil cooling conditions, 475 ° C
A martensitic stainless steel for machine parts , characterized in that the structure of acicular martensite is used as a base by tempering under air cooling conditions for 2 hours .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27892294A JP3164140B2 (en) | 1994-11-14 | 1994-11-14 | Martensitic stainless steel for machine parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27892294A JP3164140B2 (en) | 1994-11-14 | 1994-11-14 | Martensitic stainless steel for machine parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08134600A JPH08134600A (en) | 1996-05-28 |
| JP3164140B2 true JP3164140B2 (en) | 2001-05-08 |
Family
ID=17603959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27892294A Expired - Lifetime JP3164140B2 (en) | 1994-11-14 | 1994-11-14 | Martensitic stainless steel for machine parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3164140B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023188441A1 (en) * | 2022-03-30 | 2023-10-05 | 愛知製鋼株式会社 | Martensitic stainless steel for use in high-pressure hydrogen component, high-pressure hydrogen component using same, and method for producing same |
-
1994
- 1994-11-14 JP JP27892294A patent/JP3164140B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08134600A (en) | 1996-05-28 |
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