JPH0742497B2 - Heat treatment method for corrosion and heat resistant bearing steel - Google Patents
Heat treatment method for corrosion and heat resistant bearing steelInfo
- Publication number
- JPH0742497B2 JPH0742497B2 JP63025420A JP2542088A JPH0742497B2 JP H0742497 B2 JPH0742497 B2 JP H0742497B2 JP 63025420 A JP63025420 A JP 63025420A JP 2542088 A JP2542088 A JP 2542088A JP H0742497 B2 JPH0742497 B2 JP H0742497B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing steel
- corrosion
- steel
- treatment method
- soaking
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は高温で使用する軸受用鋼即ち、耐食・耐熱軸受
用鋼Ｍ−50（AISI）（以下、「Ｍ−50」という。）の炭
化物の微細化熱処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bearing steel used at high temperature, that is, a corrosion-resistant / heat-resistant bearing steel M-50 (AISI) (hereinafter referred to as "M-50"). The present invention relates to a refining heat treatment method for carbides.
（従来技術と問題点） 現在ジェットエンジンのメインシャフト等の高温用軸受
には材料としてAISI Ｍ−50（0.8C−4Cr−4Mo−1V、時
にはＷを0.14％以下含む。）が主として用いられるがそ
の用途上高信頼性と長寿命が常に要求されている。Ｍ−
50中に存在する炭化物は耐摩耗性や高い硬さを付与する
ために不可欠のものであるが、その一方で巨大な炭化物
は応力集中源となり寿命に好ましくない影響をおよぼ
す。寿命の改善には一般には鋼中の酸化物ないし介在物
を低減させることが有効であるが、Ｍ−50の場合それだ
けでは十分でなく上述のごとく炭化物を微細化する必要
がある。鋼中の炭化物の微細化にはSUJ2などの場合鋼塊
で高温均質化熱処理が行われているが、Ｍ−50の場合そ
の効果はまだ明らかにされていない。(Prior art and problems) Currently, AISI M-50 (0.8C-4Cr-4Mo-1V, sometimes containing 0.14% or less W) is mainly used as a material for high temperature bearings such as main shafts of jet engines. High reliability and long life are always required for its application. M-
The carbides present in 50 are indispensable for imparting wear resistance and high hardness, while large carbides act as stress concentration sources and have an unfavorable effect on life. In order to improve the life, it is generally effective to reduce oxides or inclusions in the steel, but in the case of M-50, this is not enough and it is necessary to refine the carbides as described above. In the case of SUJ2 or the like, high-temperature homogenization heat treatment is performed on a steel ingot for refining carbides in steel, but in the case of M-50, its effect has not been clarified yet.
本発明はかかる点を考慮してＭ−50に代表される高温軸
受用鋼の炭化物の微細化を検討した結果なされたもので
ある。The present invention has been made as a result of studying the refining of carbides in a high temperature bearing steel represented by M-50 in consideration of the above points.
（問題点の解決手段） すなわち本発明は重量％で、C:0.7〜0.9％、Si:≦0.30
％、Mn:≦0.40％、Cr:3.0〜5.0％、Mo:3.5〜4.5％、V:
0.8〜1.2％、W:≦0.14、残部Feおよび不可避の不純物か
らなる鋼、即ちＭ−50、における、鋼塊又は鋳塊を一度
鍛練比（鋼塊の断面積と圧鍛成品の断面積の比）を２以
上で加工ししかる後1150〜1220℃で２時間以上均熱処理
をすることにより炭化物を微細化することを特徴として
いる。(Means for Solving Problems) That is, the present invention is, by weight%, C: 0.7 to 0.9%, Si: ≤ 0.30.
%, Mn: ≤ 0.40%, Cr: 3.0 to 5.0%, Mo: 3.5 to 4.5%, V:
0.8 to 1.2%, W: ≤ 0.14, steel consisting of balance Fe and unavoidable impurities, that is, M-50, the steel ingot or ingot is once forged ratio (the cross-sectional area of the steel ingot and the cross-sectional area of the pressure forged product It is characterized in that the carbide is refined by soaking at a ratio of 2 or more and then soaking at 1150 to 1220 ° C. for 2 hours or more.
（作用） 均熱処理は高炭素クロム軸受鋼であるSUJ2などでは通常
鋼塊の状態でおこなわれるが、高炭素でかつ合金元素量
の多いＭ−50などの高速度鋼では偏析のはげしい中心部
などで均熱処理により炭化物が溶融によってかえって巨
大化することがあるため通常は行われていない。そこで
種々検討した結果重量％で、C:0.7〜0.9％、Si:≦0.30
％、Mn:≦0.40％、Cr:3.0〜5.0％、Mo:3.5〜4.5％、V:
0.8〜1.2％、W:≦0.14、残部Feおよび不可避の不純物か
らなる鋼、即ちＭ−50、における、鋼塊又は鋳塊を鍛練
比２以上に一度加工し、それを適正な条件で均熱処理す
ると炭化物が巨大化することはなく、寿命も良好となる
ことが判明した。この理由は鋼塊を一度鍛練比２以上に
加工することにより、炭化物、偏析、デンドライト等が
ある程度微細化もしくは軽減され、しかる後均熱処理を
行なうと炭化物の溶融等は起こらず炭化物の微細化がな
されるものと思われる。(Operation) Soaking is usually performed in the ingot state in SUJ2, which is a high carbon chromium bearing steel, but in the case of high speed steel such as M-50, which has a high carbon content and a large amount of alloying elements, the center portion where segregation is severe Since the soaking may cause the carbides to become rather large due to melting, it is not usually performed. As a result of various studies, C: 0.7 to 0.9%, Si: ≤ 0.30% by weight
%, Mn: ≤ 0.40%, Cr: 3.0 to 5.0%, Mo: 3.5 to 4.5%, V:
0.8-1.2%, W: ≦ 0.14, steel consisting of balance Fe and unavoidable impurities, that is, M-50, a steel ingot or ingot is processed once to a forging ratio of 2 or more, and it is soaked under appropriate conditions. Then, it was found that the carbide did not become huge and the life was improved. The reason for this is that once the steel ingot is processed to have a forging ratio of 2 or more, carbides, segregation, dendrites, etc. are miniaturized or reduced to a certain extent. It seems to be done.
次に特許請求範囲を定めた理由を述べる。Next, the reason why the claims are defined will be described.
（１）鍛練比２以上 鍛練比が２以上でないと鋼塊中の炭化物、偏析およびデ
ンドライト等の微細化が十分でなく、後の均熱処理の効
果が得られないので鍛練比を２以上とした。(1) Working ratio of 2 or more If the working ratio is not 2 or more, the refinement of carbides, segregation, dendrite, etc. in the steel ingot is not sufficient, and the effect of the subsequent soaking is not obtained, so the working ratio is set to 2 or more. .
（２）均熱温度 前述の鍛練比との関係で1150℃〜1220℃の間で炭化物は
微細化し、1150℃以下では微細化せず、1220℃以上では
かえって炭化物の溶融が起こる可能性がある為、下限を
1150℃に、上限を1220℃とした。(2) Soaking temperature Due to the above-mentioned forging ratio, carbides become finer between 1150 ° C and 1220 ° C, not finer at 1150 ° C or lower, and may rather melt at 1220 ° C or higher. Therefore, the lower limit
The upper limit was set to 1150 ° C and 1220 ° C.
（３）保持時間２時間以上 有効保持時間が２時間以上でないと炭化物の微細化が起
こらないので下限を２時間とする、 （実施例） 表１に供試材および均熱条件およびスラスト型試験機に
よる寿命試験結果を示す。このように鍛練比２以上、11
50℃〜1220℃で保持時間２時間以上の均熱処理において
良好な寿命が得られている。(3) Retention time of 2 hours or more If the effective retention time is not 2 hours or more, refining of carbides does not occur, so the lower limit is set to 2 hours. (Example) Table 1 shows test materials, soaking conditions, and thrust type tests. The life test result by the machine is shown. In this way, a training ratio of 2 or more, 11
Good life is obtained in soaking at 50 ° C to 1220 ° C for a holding time of 2 hours or more.
このような良好な寿命が得られるのは、第１図に示すよ
うに、鋼塊のままで均熱処理するよりも鍛練比が２以上
の鍛圧を行ったあと均熱処理した方が炭化物が微細化す
るためであろう。As shown in FIG. 1, carbides become finer when soaking is performed after a forging pressure with a forging ratio of 2 or more than when soaking as shown in FIG. To do so.
（産業上の利用分野） かかる発明を実施することにより高温軸受の寿 命が改善され、航空機用エンジン用軸受の信頼性が著し
く向上する。(Industrial field of application) The life of a high temperature bearing can be improved by carrying out the invention. Life is improved and reliability of aircraft engine bearings is significantly improved.
第１図（ａ）は本発明により、鍛練比＝３の鍛造を行っ
た後均熱処理したものの金属組織の400倍顕微鏡写真、
第１図（ｂ）は鋳造のまま均熱処理した場合の金属組織
の400倍顕微鏡写真である。第２図は均熱処理前の鍛練
比の寿命に及ぼす影響を示すグラフである。FIG. 1 (a) is a 400 × photomicrograph of the metal structure of a steel forged at a forging ratio = 3 and then subjected to soaking according to the present invention,
FIG. 1 (b) is a 400 times micrograph of the metal structure in the case of soaking as cast. FIG. 2 is a graph showing the influence of the forging ratio before soaking on the life.
Claims (1)
して規定される耐食・耐熱軸受用鋼において、鍛練比２
以上に鋼塊又は鋳塊を加工した後1150℃から1220℃の間
で２時間以上の均熱処理をすることを特徴とする耐食・
耐熱軸受用鋼の熱処理方法。1. By weight%, C: 0.7 to 0.9%, Si: ≤ 0.30%, Mn: ≤ 0.40%, Cr: 3.0 to 5.0%, Mo: 3.5 to 4.5%, V: 0.8 to 1.2%, W : ≦ 0.14%, balance Fe and unavoidable impurities. Corrosion resistant and heat resistant bearing steel defined by AISI as M-50.
Corrosion resistance characterized by performing soaking for 2 hours or more between 1150 ° C and 1220 ° C after processing the steel ingot or ingot as above
Heat treatment method for heat resistant bearing steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63025420A JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63025420A JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01201422A JPH01201422A (en) | 1989-08-14 |
| JPH0742497B2 true JPH0742497B2 (en) | 1995-05-10 |
Family
ID=12165458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63025420A Expired - Fee Related JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007006428A2 (en) | 2005-07-09 | 2007-01-18 | Skumtech As | Construction of superstructures and infrastructures |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3241491B2 (en) * | 1993-06-29 | 2001-12-25 | 大同特殊鋼株式会社 | Rolling bearing for high temperature and high speed rotation |
| ES2908220T3 (en) | 2016-09-02 | 2022-04-28 | Novo Futura Aps | Disposable grill and method of manufacturing a disposable grill |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5031529A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPS5031530A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPH0739607B2 (en) * | 1986-04-23 | 1995-05-01 | 大同特殊鋼株式会社 | Method for producing tool steel with excellent mirror finishing workability |
-
1988
- 1988-02-04 JP JP63025420A patent/JPH0742497B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007006428A2 (en) | 2005-07-09 | 2007-01-18 | Skumtech As | Construction of superstructures and infrastructures |
| EP1950375A2 (en) | 2005-07-09 | 2008-07-30 | Skumtech AS | Construction of superstructures and infrastructures |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01201422A (en) | 1989-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |