JPH06192790A - High cleanliness bearing steel - Google Patents
High cleanliness bearing steelInfo
- Publication number
- JPH06192790A JPH06192790A JP35815692A JP35815692A JPH06192790A JP H06192790 A JPH06192790 A JP H06192790A JP 35815692 A JP35815692 A JP 35815692A JP 35815692 A JP35815692 A JP 35815692A JP H06192790 A JPH06192790 A JP H06192790A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- cleanliness
- oxygen content
- bearing steel
- life
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 230000003749 cleanliness Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 238000010894 electron beam technology Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 abstract description 16
- 238000011156 evaluation Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010309 melting process Methods 0.000 abstract 1
- 238000012937 correction Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 238000000691 measurement method Methods 0.000 description 4
- 239000012925 reference material Substances 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Landscapes
- Rolling Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軸受用材料として用い
た場合に、軸受の耐久寿命を大幅に向上させる高清浄度
軸受用鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high cleanliness bearing steel which, when used as a bearing material, greatly improves the durable life of the bearing.
【０００２】[0002]
【従来の技術】従来より、軸受用鋼の転動疲労寿命は鋼
中の非金属介在物、特に酸化物系介在物の量と強い相関
関係があることが知られている。そのため、軸受用鋼の
製造者は、製造した軸受用鋼の非金属介在物量をＪＩＳ
法（ＪＩＳ−Ｇ ０５５５）やＡＳＴＭ（アメリカ材料
試験協会）法で測定し、その結果を製鋼工程の方にフィ
ードバックして、一定の品質の鋼、或いは、より高品質
の鋼を製造するようにしていた。2. Description of the Related Art It has been conventionally known that the rolling fatigue life of bearing steel has a strong correlation with the amount of nonmetallic inclusions, particularly oxide inclusions, in the steel. For this reason, bearing steel manufacturers have determined the amount of non-metallic inclusions in the manufactured bearing steel to be JIS.
Method (JIS-G 0555) or ASTM (American Society for Testing and Materials) method, and feed back the result to the steelmaking process to produce steel of constant quality or higher quality steel. Was there.
【０００３】また、鋼中の酸化物系介在物量は当然、鋼
の酸素含有量と強い相関があることから、製鋼メーカー
は軸受用鋼に関しては特に鋼中酸素含有量の低減のため
に、溶鋼脱ガスや真空精錬等の種々の高度な製鋼方法を
採用している。Further, since the amount of oxide inclusions in steel naturally has a strong correlation with the oxygen content of steel, steel manufacturers are particularly interested in bearing steel in order to reduce the oxygen content in the steel. It uses various advanced steelmaking methods such as degassing and vacuum refining.
【０００４】[0004]
【発明が解決しようとする課題】近年の製鋼技術の発達
により、鋼中の酸素含有量を１０ｐｐｍ以下にすること
が可能となったが、酸素含有量がこのような低レベルに
なると鋼中の非金属介在物量は非常に少なくなり、上記
ＪＩＳ法やＡＳＴＭ法では測定値が低く、また定量性に
欠けるため、評価方法としては不十分となっている。例
えば、ＪＩＳ−Ｇ０５５５では次のような判定方法をと
っている。With the recent development of steelmaking technology, it has become possible to reduce the oxygen content in steel to 10 ppm or less. However, when the oxygen content reaches such a low level, The amount of non-metallic inclusions is extremely small, the measured values are low according to the above-mentioned JIS method and ASTM method, and the quantification is lacking, which is an insufficient evaluation method. For example, JIS-G0555 uses the following determination method.
【０００５】顕微鏡の接眼鏡に縦、横各々２０本の格子
線をもつガラス板を挿入して、被検面をランダムに繰り
返し検鏡し、介在物によって占められた格子点中心の数
を数える。この場合、測定する視野数は原則として６０
とする。視野内のガラス板上の総格子点数、視野数及び
介在物によって占められた格子点中心の数により、次の
式によって介在物の占める面積百分率を算出し、その鋼
の清浄度（ｄ％）を判定する。 ｄ＝（ｎ／（ｐ×ｆ））×１００ …（１） ここに、ｐ：視野内のガラス板上の総格子点数 ｆ：視野数 ｎ：ｆ個の視野における全介在物によって占められる格
子点の数 である。A glass plate having 20 grid lines in each of the vertical and horizontal directions is inserted into an eyepiece of a microscope, and the surface to be inspected is randomly and repeatedly inspected to count the number of lattice point centers occupied by inclusions. . In this case, the number of fields of view to be measured is 60 in principle.
And Based on the total number of grid points on the glass plate in the field of view, the number of fields of view, and the number of center points of the grid points occupied by inclusions, the area percentage occupied by inclusions is calculated by the following formula, and the cleanliness of the steel (d%) To judge. d = (n / (p × f)) × 100 (1) where p: total number of lattice points on the glass plate in the visual field f: number of visual fields n: lattice occupied by all inclusions in f visual fields The number of points.
【０００６】ところが、酸素含有量が１０ｐｐｍ以下と
なると、上記方法で６０視野を測定しても、ほとんどの
場合、検出される非金属介在物の数ｎは極めて少なく、
清浄度と寿命との関係が明瞭でなくなり、実質上、清浄
度（非金属介在物量）の評価ができないという状態であ
った。However, when the oxygen content is 10 ppm or less, in most cases, the number n of non-metallic inclusions to be detected is extremely small, even if 60 visual fields are measured by the above method.
The relationship between cleanliness and life became unclear, and it was virtually impossible to evaluate cleanliness (amount of non-metallic inclusions).
【０００７】また、鋼の酸素含有量と転動疲労寿命との
関係も、図２に示すように、同じ酸素含有量であっても
転動寿命はばらつく。このため、このようなレベルの鋼
では、酸素含有量によっても軸受用鋼の転動寿命特性を
正しく把握することができない。As for the relationship between the oxygen content of steel and the rolling fatigue life, as shown in FIG. 2, even if the oxygen content is the same, the rolling life varies. Therefore, with such a level of steel, the rolling life characteristics of the bearing steel cannot be correctly grasped even by the oxygen content.
【０００８】本発明はこのような課題を解決するために
成されたものであり、その目的とするところは、新たな
清浄度の測定方法を作成し、それに基づいて従来法より
定量的に評価することにより確実に高耐久寿命を保証す
ることのできる軸受用鋼を提供することにある。The present invention has been made in order to solve such a problem, and its purpose is to create a new measuring method of cleanliness and to quantitatively evaluate it based on the method. The purpose of the present invention is to provide a bearing steel capable of reliably ensuring a high durability life.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に成された本発明に係る高清浄度軸受用鋼は、鋼中酸素
含有量が１０ｐｐｍ未満であり、かつ、電子ビーム溶融
法により浮上・凝集させた非金属介在物の表面露出面積
が、１グラム当たり２０μｍ2以下であることを特徴と
するものである。The high cleanliness bearing steel according to the present invention made to solve the above problems has an oxygen content in the steel of less than 10 ppm and is floated by an electron beam melting method. The surface exposed area of the aggregated non-metallic inclusions is 20 μm 2 or less per gram.
【００１０】[0010]
【作用】まず、電子ビーム溶融による清浄度測定法を説
明する。清浄度を測定しようとする試料を１〜５グラム
程度用意し、電子ビームを照射することにより、試料を
全て溶融させる。このとき、溶融をできるかぎり均一に
するため、予め電子ビーム又はヒータ等の別の熱源によ
り、試料を融点下１００Ｋ程度の温度に予熱しておくこ
とが望ましい。試料が全て溶融した後、試料の融点より
も少し（１０〜５０Ｋ程度）高い温度で所定時間（１〜
１０秒程度が望ましい）だけ保持し、試料中の非金属介
在物を凝集させる。このための電子ビームのエネルギは
２．０〜７．０ｋＪ／ｇとすることが望ましい（余熱は
除く）。２．０ｋＪ／ｇ未満の投入エネルギでは非金属
介在物が凝集せず、個々に浮上してしまう。また、７．
０ｋＪ／ｇを超える電子ビームエネルギを投入すると、
溶融池内の対流が激しくなり、浮上した非金属介在物が
内部に巻き込まれる等により、やはり非金属介在物の凝
集が妨げられる。First, the method of measuring cleanliness by electron beam melting will be described. About 1 to 5 grams of a sample whose cleanliness is to be measured is prepared and irradiated with an electron beam to melt the entire sample. At this time, in order to make the melting as uniform as possible, it is desirable to preheat the sample to a temperature of about 100 K below the melting point in advance by using another heat source such as an electron beam or a heater. After all the samples are melted, at a temperature slightly higher (about 10 to 50 K) than the melting point of the samples for a predetermined time (1 to 10 K).
Hold for about 10 seconds) to agglomerate non-metallic inclusions in the sample. The energy of the electron beam for this purpose is preferably 2.0 to 7.0 kJ / g (excluding residual heat). When the input energy is less than 2.0 kJ / g, the non-metallic inclusions do not aggregate and individually float. Also, 7.
When an electron beam energy exceeding 0 kJ / g is input,
Convection in the molten pool becomes violent, and the floating non-metallic inclusions are caught in the inside, so that the aggregation of the non-metallic inclusions is also hindered.
【００１１】その後、静かに電子ビームの強度を下げ、
試料を凝固させる。このとき、溶融時に凝集した非金属
介在物は、凝固後の試料においてもそのまま頂部表面に
現われる。従って、顕微鏡を用いて（走査型電子顕微
鏡、光学顕微鏡のいずれを用いてもよい）その表面に現
われた部分の面積を測定し、その値を試料の質量で除す
ることにより、清浄度とすることができる。なお、図４
（ａ）にこの方法により非金属介在物を凝集させた状態
（凝固後）の試料の走査型電子顕微鏡写真を、図４
（ｂ）に投入エネルギを過小（１．８ｋＪ／ｇ）にして
溶融・凝固させた試料の走査型電子顕微鏡写真を示す
（倍率は共に約３５０倍）。After that, the intensity of the electron beam is gently lowered,
Allow the sample to solidify. At this time, the nonmetallic inclusions aggregated at the time of melting appear on the surface of the top as they are even in the sample after solidification. Therefore, using a microscope (either a scanning electron microscope or an optical microscope may be used), measure the area of the portion that appears on the surface, and divide that value by the mass of the sample to obtain the cleanliness. be able to. Note that FIG.
FIG. 4A is a scanning electron micrograph of a sample in which nonmetallic inclusions are aggregated by this method (after solidification) in FIG.
A scanning electron micrograph of a sample melted and solidified with an input energy being too small (1.8 kJ / g) is shown in (b) (magnification is about 350 times).
【００１２】各種条件で製造し、酸素含有量を変化させ
た（ただし、いずれも酸素含有量は１０ｐｐｍ未満）軸
受用鋼について、上記方法による清浄度を求めると共
に、転動疲労寿命試験を行なったところ、表面露出面積
が１グラム当たり２０μｍ2以下である場合には、Ｌ10
寿命比（測定対象である試料の累積破損率が１０％とな
る転動回数Ｌ10sを、基準となる値Ｌ10cで除した値。こ
こでは基準値Ｌ10cとして、酸素含有量が１０ｐｐｍで
ある鋼のＬ10の平均値を取った。）が５以上となること
がわかった。すなわち、本発明に係る高清浄度軸受用鋼
を用いて軸受を作成することにより、理想的な条件の下
では、従来の約５倍の長寿命を確保することができる。With respect to bearing steels produced under various conditions and having different oxygen contents (however, the oxygen contents are less than 10 ppm in each case), the cleanliness was determined by the above method and a rolling fatigue life test was conducted. However, when the exposed surface area is 20 μm 2 or less per gram, L10
Life ratio (a value obtained by dividing the rolling frequency L10s at which the cumulative damage rate of the sample to be measured is 10% by a reference value L10c. Here, the reference value L10c is L10 of steel having an oxygen content of 10 ppm. Was found to be 5 or more. That is, by making a bearing using the high cleanliness bearing steel according to the present invention, under ideal conditions, it is possible to secure a life that is about five times longer than that of conventional bearings.
【００１３】[0013]
【実施例】本発明の一実施例を図１〜図３により説明す
る。真空脱ガス処理により生産された軸受用鋼ＪＩＳ−
ＳＵＪ２より、酸素含有量が１０ｐｐｍ未満であるもの
１２種を採取し、供試材とした。また、酸素含有量が１
０ｐｐｍであるもの４種を採取し、これを基準材とし
た。これら供試材１２鋼（Ａ〜Ｌ）及び基準材４鋼（Ｍ
〜Ｐ）の化学成分を図３に示す。供試材１２鋼につい
て、上述の電子ビーム溶融法により清浄度を測定すると
ともに、供試材と基準材について、転動疲労寿命試験を
行なった。ここで、供試材の転動疲労寿命は、基準材４
鋼（Ｍ〜Ｐ）のＬ10（転動疲労試験を行なった試験片の
数の１０％が破損する転動回数）の平均値を１とし、そ
れに対する供試材各鋼（Ａ〜Ｌ）のＬ10の比で評価し
た。その結果は図３の右端欄の通りであり、このＬ10寿
命比を上述の電子ビーム溶融法により測定した清浄度
（比面積＝μｍ2／ｇ）に対してプロットすると、図１
のグラフに示す通り、非常に相関度の高い曲線が得られ
る。それに対し、Ｌ10寿命比を酸素含有量に対してプロ
ットすると、図２のようにＬ10寿命比はばらつき、酸素
分析値のみでは正確な耐久寿命特性を予測することが不
可能であることがわかる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Bearing steel JIS-produced by vacuum degassing
Twelve species having an oxygen content of less than 10 ppm were collected from SUJ2 and used as test materials. Also, the oxygen content is 1
Four kinds having 0 ppm were collected and used as a reference material. These test materials 12 steel (AL) and reference material 4 steel (M
~ P) chemical components are shown in FIG. The cleanliness of the test material 12 steel was measured by the electron beam melting method described above, and the rolling fatigue life test was performed on the test material and the reference material. Here, the rolling fatigue life of the test material is 4
The average value of L10 (10% of the number of test pieces subjected to rolling fatigue test) of steels (MP) was set to 1, and the average value of each of the test material steels (AL) was set to 1. It was evaluated by the ratio of L10. The results are shown in the rightmost column of FIG. 3. When this L10 life ratio is plotted against the cleanliness (specific area = μm 2 / g) measured by the above-mentioned electron beam melting method, FIG.
As shown in the graph, a curve with a high degree of correlation is obtained. On the other hand, when the L10 life ratio is plotted against the oxygen content, it can be seen that the L10 life ratio varies as shown in FIG. 2, and it is impossible to accurately predict the durable life characteristic only by the oxygen analysis value.
【００１４】図１のグラフより、上記評価法による清浄
度（比面積）を２０μｍ2／ｇ以下とすることにより、
Ｌ10寿命比が５以上となることがわかる。From the graph of FIG. 1, by setting the cleanliness (specific area) according to the above evaluation method to 20 μm 2 / g or less,
It can be seen that the L10 life ratio becomes 5 or more.
【００１５】[0015]
【発明の効果】本発明に係る高清浄度軸受用鋼では、従
来のＪＩＳ法やＡＳＴＭ法では評価し得なかった低酸
素、低非金属介在物量の鋼についても確実に清浄度を測
定することができる新清浄度測定法を用い、それを基に
清浄度の基準値を定めているため、転動疲労寿命を従来
の軸受用鋼よりも確実に延ばすことができる。具体的に
は、その清浄度（電子ビーム溶融法により浮上・凝集さ
せた酸化物系介在物の、試料１グラム当たりの表面露出
面積＝比面積）を、２０μｍ2以下とすることにより、
軸受用鋼の転動疲労寿命を従来の約５倍以上とすること
ができる。EFFECT OF THE INVENTION With the high cleanliness bearing steel according to the present invention, it is possible to reliably measure the cleanliness of steel with low oxygen content and low non-metallic inclusion amount, which could not be evaluated by the conventional JIS method or ASTM method. Since a new cleanliness measurement method that can be used is used and the standard value of cleanliness is determined based on it, rolling fatigue life can be extended more reliably than conventional bearing steels. Specifically, the cleanliness (exposed surface area of the oxide inclusions floated / aggregated by the electron beam melting method = specific area per 1 gram of the sample = specific area) is set to 20 μm 2 or less,
The rolling contact fatigue life of the bearing steel can be made about 5 times or more longer than the conventional value.
【図１】 電子ビーム溶融法を用いた新しい測定法によ
る清浄度とＬ10寿命比をプロットしたグラフ。FIG. 1 is a graph plotting cleanliness and L10 life ratio by a new measurement method using an electron beam melting method.
【図２】 Ｌ10寿命比を酸素含有量に対してプロットし
たグラフ。FIG. 2 is a graph in which the L10 life ratio is plotted against the oxygen content.
【図３】 供試材及び基準材の化学成分を示す図。FIG. 3 is a view showing chemical components of a test material and a reference material.
【図４】 新しい測定法の適切な条件により溶融・凝固
させた試料の電子顕微鏡写真（ａ）及び適切な範囲を外
れた条件で溶融・凝固させた試料の電子顕微鏡写真
（ｂ）。FIG. 4 is an electron micrograph (a) of a sample melted and solidified under appropriate conditions of the new measurement method and an electron micrograph (b) of a sample melted and solidified under conditions outside the appropriate range.
【手続補正書】[Procedure amendment]
【提出日】平成５年１２月１６日[Submission date] December 16, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項１[Name of item to be corrected] Claim 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００９[Correction target item name] 0009
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に成された本発明に係る高清浄度軸受用鋼は、鋼中酸素
含有量が１０ｐｐｍ未満であり、かつ、電子ビーム溶融
法により浮上・凝集させた非金属介在物の表面露出面積
が、１グラム当たり２０×１０３ μｍ２以下であること
を特徴とするものである。The high cleanliness bearing steel according to the present invention made to solve the above problems has an oxygen content in the steel of less than 10 ppm and is floated by an electron beam melting method. -The surface exposed area of the aggregated non-metallic inclusions is 20 x 10 3 µm 2 or less per gram.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１２】各種条件で製造し、酸素含有量を変化させ
た（ただし、いずれも酸素含有量は１０ｐｐｍ未満）軸
受用鋼について、上記方法による清浄度を求めると共
に、転動疲労寿命試験を行なったところ、表面露出面積
が１グラム当たり２０×１０３ μｍ２以下である場合に
は、Ｌ１０寿命比（測定対象である試料の累積破損率が
１０％となる転動回数Ｌ１０ｓを、基準となる値Ｌ１０
ｃで除した値。ここでは基準値Ｌ１０ｃとして、酸素含
有量が１０ｐｐｍである鋼のＬ１０の平均値を取っ
た。）が５以上となることがわかった。すなわち、本発
明に係る高清浄度軸受用鋼を用いて軸受を作成すること
により、理想的な条件の下では、従来の約５倍の長寿命
を確保することができる。With respect to bearing steels produced under various conditions and having different oxygen contents (however, the oxygen contents are less than 10 ppm in each case), the cleanliness was determined by the above method and a rolling fatigue life test was conducted. However, when the surface exposed area is 20 × 10 3 μm 2 or less per gram, the L10 life ratio (the number of rolling cycles L10s at which the cumulative damage rate of the sample to be measured is 10% is a reference value). L10
The value divided by c. Here, as the reference value L10c, the average value of L10 of steel having an oxygen content of 10 ppm was taken. ) Was 5 or more. That is, by making a bearing using the high cleanliness bearing steel according to the present invention, under ideal conditions, it is possible to secure a life that is about five times longer than that of conventional bearings.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１４[Correction target item name] 0014
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１４】図１のグラフより、上記評価法による清浄
度（比面積）を２０×１０３ μｍ２／ｇ以下とすること
により、Ｌ１０寿命比が５以上となることがわかる。From the graph of FIG. 1, it can be seen that the L10 life ratio becomes 5 or more by setting the cleanliness (specific area) according to the above evaluation method to 20 × 10 3 μm 2 / g or less.
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Name of item to be corrected] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】[0015]
【発明の効果】本発明に係る高清浄度軸受用鋼では、従
来のＪＩＳ法やＡＳＴＭ法では評価し得なかった低酸
素、低非金属介在物量の鋼についても確実に清浄度を測
定することができる新清浄度測定法を用い、それを基に
清浄度の基準値を定めているため、転動疲労寿命を従来
の軸受用鋼よりも確実に延ばすことができる。具体的に
は、その清浄度（電子ビーム溶融法により浮上・凝集さ
せた酸化物系介在物の、試料１グラム当たりの表面露出
面積＝比面積）を、２０×１０３ μｍ２以下とすること
により、軸受用鋼の転動疲労寿命を従来の約５倍以上と
することができる。EFFECT OF THE INVENTION With the high cleanliness bearing steel according to the present invention, it is possible to reliably measure the cleanliness of steel with low oxygen content and low non-metallic inclusion amount, which could not be evaluated by the conventional JIS method or ASTM method. Since a new cleanliness measurement method that can be used is used and the standard value of cleanliness is determined based on it, rolling fatigue life can be extended more reliably than conventional bearing steels. Specifically, the cleanliness (surface exposed area per 1 gram of the sample of oxide inclusions floated and aggregated by the electron beam melting method = specific area) should be 20 × 10 3 μm 2 or less. As a result, the rolling contact fatigue life of the bearing steel can be made about 5 times longer than the conventional one.
【手続補正７】[Procedure Amendment 7]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
Claims (1)
り、かつ、電子ビーム溶融法により浮上・凝集させた酸
化物系介在物の表面露出面積が、１グラム当たり２０μ
ｍ2以下であることを特徴とする高清浄度軸受用鋼。1. The oxygen content in steel is less than 10 ppm, and the exposed surface area of oxide inclusions floated and aggregated by the electron beam melting method is 20 μm per gram.
Steel for high cleanliness bearings, characterized by having m 2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35815692A JPH06192790A (en) | 1992-12-26 | 1992-12-26 | High cleanliness bearing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35815692A JPH06192790A (en) | 1992-12-26 | 1992-12-26 | High cleanliness bearing steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06192790A true JPH06192790A (en) | 1994-07-12 |
Family
ID=18457837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35815692A Pending JPH06192790A (en) | 1992-12-26 | 1992-12-26 | High cleanliness bearing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06192790A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276210B2 (en) | 1998-10-28 | 2001-08-21 | Nsk Ltd. | Rolling bearing |
| FR2809745A1 (en) * | 2000-06-05 | 2001-12-07 | Sanyo Special Steel Co Ltd | High cleanness steel production includes adding a deoxidizing agent to a ladle before pouring steel melt into the ladle or adding deoxidizing agent to the melt during pouring of the melt into the ladle |
| US6725720B2 (en) | 2000-12-25 | 2004-04-27 | Nsk Ltd. | Rolling bearing, and method of ultrasonically detecting flaws in bearing raceway ring of rolling bearing |
| GB2406580A (en) * | 2000-06-05 | 2005-04-06 | Sanyo Special Steel Co Ltd | High-cleanliness steel and processes for producing the same |
| DE10034031B4 (en) * | 1999-07-14 | 2006-05-18 | Nsk Ltd. | Method for testing a component of a continuously variable toroidal transmission |
| CN1311086C (en) * | 2000-06-05 | 2007-04-18 | 山阳特殊制钢株式会社 | High cleanliness steel and its production method |
| JP2010217076A (en) * | 2009-03-18 | 2010-09-30 | Nsk Ltd | Method of evaluating inclusion |
| US8393226B2 (en) | 2010-07-29 | 2013-03-12 | Nsk Ltd. | Inclusion rating method |
| CN105452510A (en) * | 2013-08-08 | 2016-03-30 | 山阳特殊制钢株式会社 | Steel having superior rolling fatigue life |
-
1992
- 1992-12-26 JP JP35815692A patent/JPH06192790A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276210B2 (en) | 1998-10-28 | 2001-08-21 | Nsk Ltd. | Rolling bearing |
| US6287010B1 (en) | 1998-10-28 | 2001-09-11 | Nsk Ltd. | Rolling bearing |
| DE10034031B4 (en) * | 1999-07-14 | 2006-05-18 | Nsk Ltd. | Method for testing a component of a continuously variable toroidal transmission |
| GB2406580A (en) * | 2000-06-05 | 2005-04-06 | Sanyo Special Steel Co Ltd | High-cleanliness steel and processes for producing the same |
| GB2381537B (en) * | 2000-06-05 | 2005-09-14 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| FR2812661A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| FR2812663A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| WO2001094648A3 (en) * | 2000-06-05 | 2002-08-08 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2381537A (en) * | 2000-06-05 | 2003-05-07 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| US7396378B2 (en) | 2000-06-05 | 2008-07-08 | Sanyo Special Steel Co., Ltd. | Process for producing a high cleanliness steel |
| FR2812662A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| GB2406580B (en) * | 2000-06-05 | 2005-09-07 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| FR2812660A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| FR2809745A1 (en) * | 2000-06-05 | 2001-12-07 | Sanyo Special Steel Co Ltd | High cleanness steel production includes adding a deoxidizing agent to a ladle before pouring steel melt into the ladle or adding deoxidizing agent to the melt during pouring of the melt into the ladle |
| CN1311086C (en) * | 2000-06-05 | 2007-04-18 | 山阳特殊制钢株式会社 | High cleanliness steel and its production method |
| US6725720B2 (en) | 2000-12-25 | 2004-04-27 | Nsk Ltd. | Rolling bearing, and method of ultrasonically detecting flaws in bearing raceway ring of rolling bearing |
| JP2010217076A (en) * | 2009-03-18 | 2010-09-30 | Nsk Ltd | Method of evaluating inclusion |
| US8393226B2 (en) | 2010-07-29 | 2013-03-12 | Nsk Ltd. | Inclusion rating method |
| CN105452510A (en) * | 2013-08-08 | 2016-03-30 | 山阳特殊制钢株式会社 | Steel having superior rolling fatigue life |
| US10060013B2 (en) | 2013-08-08 | 2018-08-28 | Sanyo Special Steel Co., Ltd. | Steel having superior rolling fatigue life |
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