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CN103547696A - Improved bearing steel - Google Patents

Improved bearing steel Download PDF

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Publication number
CN103547696A
CN103547696A CN201280024073.3A CN201280024073A CN103547696A CN 103547696 A CN103547696 A CN 103547696A CN 201280024073 A CN201280024073 A CN 201280024073A CN 103547696 A CN103547696 A CN 103547696A
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weight
bearing
bearing steel
content
steel
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CN201280024073.3A
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Inventor
T.伦德
K.里登
I.斯特兰德尔
J.哈尔伯格
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SKF AB
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Priority to CN201710817319.7A priority Critical patent/CN107760986A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/66—High carbon steel, i.e. carbon content above 0.8 wt%, e.g. through-hardenable steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/60—Thickness, e.g. thickness of coatings

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The present invention relates to a bearing steel comprising at least 0.6 percent by weight of carbon, 0.007 percent by weight or less of phosphorous, and optionally other alloying element(s); the balance being iron, or iron and impurities. The present invention also relates to a bearing consisting of the bearing steel.

Description

Modified version bearing steel
The technology of the present invention field
The present invention relates to a kind of bearing steel.The invention still further relates to the bearing of being manufactured by bearing steel.
Background
Bearing, for example roller bearing (roller bearing) and spot contact bearing (ball bearing), in use bear high loading.Therefore, bearing should have high-fatigue strength, and in addition, has high rigidity.
The steel that is known that high-content carbon has high rigidity, but exists this steel to have the problem of low fatigue strength.
Invention summary
An object of the present invention is to provide the there is improved fatigue strength bearing steel of (fatigue strength).Another object of the present invention is to provide the bearing of being manufactured by bearing steel according to the present invention.
According to a first aspect of the invention, by a kind of bearing steel, realize its object, this bearing steel comprises carbon, 0.007 % by weight or the phosphorus still less (phosphorous) of at least 0.6 % by weight and optionally, other alloying element (one or more), and surplus is iron.
Be understandable that, outside deironing, this surplus can comprise impurity.This impurity can be for being present in impurity and the trace element in iron or steel conventionally.Therefore, this bearing steel can comprise carbon, 0.007 % by weight or the phosphorus still less of at least 0.6 % by weight and optionally, other alloying element (one or more), and surplus is iron or iron and impurity.
The content of included impurity is 0.5 % by weight or still less, preferably 0.425 % by weight or still less.Exemplary impurity can be, for example Cu, As, Sn, Sb, Pb, Ti or O, or their combination.The impurity of low levels, for example Ti and O, the hard non-metallic inclusion (hard non-metallic inclusion) that causes low levels, it is combined with having at other element of austenite grain boundary (austenite grain boudary) aggregation tendency of low levels, makes this bearing steel have high-fatigue strength.Particularly, according to the impurity combination of the phosphorus of low levels of the present invention and low levels, thereby generate the bearing steel with high-fatigue strength.
This is pure iron for this iron-based, substantially free from foreign meter.
Carbon amount according to the present invention has steel to be applicable to the high rigidity of bearing.According to phosphorus amount of the present invention, generate the bearing steel with high-fatigue strength.
The phosphorus content that this bearing steel can have is below 0.007 % by weight, preferably 0.003～0.007 % by weight, for example 0.004～0.006 % by weight.At steelworks (steelwork), can effectively manufacture the steel with this content phosphorus, and this steel has high-fatigue strength.Phosphorus content is less than that 0.003 % by weight may be difficult to manufacture and manufacturing cost is high, and be greater than 0.007 % by weight content, can not produce required high-fatigue strength.
Advantage of the present invention is that the phosphorus of low levels has the bearing steel of high-fatigue strength in conjunction with the carbon generation of certain content.
Carbon content in bearing steel can be 0.6～1.5 % by weight, for example 0.7～1.3 % by weight, or 0.7～1.1 % by weight, and carbon content is preferably 0.7～1.2 % by weight, more preferably 0.8～1.1 % by weight.For example, its content can be 0.9～1.0 % by weight.These carbon contents make bearing steel have desirable character, for example high rigidity.Even for example, under the so high carbon content of 0.9～1.1 % by weight, when being 0.007 % by weight or the combination of phosphorus still less with content, this bearing steel has high-fatigue strength.
Therefore, this bearing steel can be considered as to high carbon steel or superhigh carbon steel.
This bearing steel can also comprise sulphur (S), and content is 0.02 % by weight or still less.Sulphur content can be 0.0001～0.02 % by weight, as 0.0001～0.016 % by weight, or 0.0001～0.011 % by weight.According to an embodiment of the invention, sulphur content is 0.0001～0.002 % by weight, as 0.0001～0.001 % by weight, and 0.0001～0.0002 % by weight for example.So low sulphur content makes bearing steel have high-fatigue strength.Another embodiment according to the present invention, sulphur content can be 0.002～0.02 % by weight, as 0.002～0.013 % by weight, for example 0.003～0.012 % by weight, 0.005～0.012 % by weight or 0.007～0.011 % by weight.Even under so high sulphur content, and so high sulphur content is in conjunction with according under high-carbon content of the present invention and phosphorus content, and bearing steel still has high-fatigue strength.
It is 0.02 % by weight or sulphur still less and phosphorus that bearing steel can also comprise total amount.The total amount of this sulphur and phosphorus produces the bearing steel with high-fatigue strength.
Bearing steel can also comprise the aluminium as alloying element, and its content is 0.01 % by weight or more.Aluminium content is preferably 0.015 % by weight or more, or more preferably 0.02 % by weight or more.Maximum aluminium content can be 0.05 % by weight.Therefore, the aluminium content in bearing steel can be 0.015～0.05 % by weight.
Bearing steel can also comprise molybdenum (Mo), and its content is 0.1～0.7 % by weight, preferred 0.3～0.7 % by weight, and most preferably 0.5～0.7 % by weight, for example 0.51～0.6 % by weight.This molybdenum content can cause having the hard bearing steel of high-fatigue strength.In addition, this molybdenum content can be effective for the manufacture with the bearing steel of bainite structure.
Bearing steel can have bainite structure or for bainite sclerosis (quenching).Be understandable that, this bearing steel also can comprise other structures except bainite structure.Preferably in this bearing steel, surpass 50% and have bainite structure, for example 50～90% in this bearing steel has bainite structure.
Bainite structure causes mechanical properties to be improved, and has high tenacity and high crack growth resistance (crack propagation resistance).Therefore,, because this steel and bearing in usual and Special use process bear high load, bainite structure is useful to bearing steel and bearing.The relevant embodiment according to the present invention, the combination producing of relatively high carbon content, low phosphorus content, relatively high molybdenum content and/or relatively high sulphur content has the bearing steel of high bearing fatigue intensity.
According to following methods, can obtain the bainite sclerosis of bearing steel: make steel stand austenitizing (austenitization) and quench; This steel is placed to the above starting temperature (T1) of initial martensite formation temperature (Ms); In bainite conversion process, reduce the following but temperature more than actual martensite formation temperature of T1 to Ms.
The bainite structure that causes effectively obtaining bearing steel for the method for bainite sclerosis, it has short bainite setting time and high Bearing Steel.
The hardness of bearing steel can more than 59HRC, for example, be 59～62HRC, or be greater than 62HRC.
Therefore, bearing steel or bearing can have bainite structure and the hardness of 62HRC at least substantially.
Bearing steel also can have martensitic structure or for martensitic hardening, still have high-fatigue strength.
The bearing steel with 0.1～0.7 % by weight Mo content is applicable to the bearing of 0～150mm material thickness.This bearing steel can have the Mo content of 0.1～0.5 % by weight, and the material thickness that this Mo content can be applicable is 0～150mm, for example 15～100mm, for example 15～45mm.
It is 45mm or higher bearing that the bearing steel with 0.5～0.7 % by weight Mo content is specially adapted to material thickness, and for example material thickness is 45～150mm, or 45～80mm.This bearing can be, for example, have the roller bearing of 45～80mm wall thickness.
The bearing steel that is used for the bearing of the following material thickness of 15mm can have below 0.35 % by weight, or the Mo of 0～0.35 % by weight content.This bearing steel can have bainite structure.
Particularly, the bearing steel that comprises 0.1～0.7 % by weight Mo content can have bainite structure.
This bearing steel can comprise chromium (Cr), and its content is 1.0～3.0 % by weight, for example 1.3～2.0 % by weight.The chromium content of 1.0～1.5 % by weight can be specially adapted to the bearing that material thickness is 0～45mm, for example 15～45mm.The chromium content of 1.5～3.0 % by weight, 1.5～2.0 % by weight for example, being specially adapted to material thickness is 45mm and larger bearing, for example 45～80mm, or 45～150mm.
Comprise Cr content and be this bearing steel of 1.0～3.0 % by weight applicable to bainite structure.
Other optional alloying element (one or more) can be selected from lower group, and it comprises Si, Mn, S, Cr, Ni, Mo, V and Al, or their combination.
This other optional alloying element is applicable to giving the character that this steel is suitable.
If this other optional alloying element is present in bearing steel, its suitable content can be in following scope:
Silicon (Si): 0～2.5 % by weight, for example 0.0001～2.5 % by weight.
Manganese (Mn): 0～2 % by weight, for example 0.0001～2 % by weight.
Sulphur (S): 0～0.02 % by weight, for example 0.0001～0.02 % by weight.
Chromium (Cr): 0～3 % by weight.
Nickel (Ni): 0～1 % by weight, for example 0.0001～1 % by weight.
Molybdenum (Mo): 0～1 % by weight.
Vanadium (V): 0～1 % by weight, for example 0.0001～1 % by weight.
Aluminium (Al): 0.01～0.050 % by weight.
The alloying element of this content can cause the hard non-metallic inclusion of low levels and have the bearing steel of high-fatigue strength.
According to a second aspect of the invention, provide and comprised the bearing of following bearing steel or the bearing being formed by following bearing steel, this bearing steel comprises carbon, 0.007 % by weight or the phosphorus still less of at least 0.6 % by weight and optionally, other alloying element (one or more), surplus is iron or iron and impurity.
Can be preferably, this bearing by or substantially by carbon, 0.007 % by weight or the phosphorus still less of at least 0.6 % by weight and optionally, other alloying element (one or more) forms.
Therefore, can provide the bearing with bearing steel character as discussed above.Therefore can provide the bearing with high-fatigue strength.
This bearing can be selected from: spot contact bearing and roller bearing; Wherein spot contact bearing is selected from zanjon spot contact bearing, angular contact ball bearing, ball thrust bearing, angular contact ball thrust bearing and automatically locates spot contact bearing (self-aligning ball bearing), or their combination; And wherein this roller bearing can be selected from: roller bearing, spherical roller bearing, thrust roller bearing, needle bearing (needle roller bearing), annulus roller bearing (toroidal roller bearing), CARB
Figure BDA0000416700700000041
annulus roller bearing, combination needle bearing, taper roller bearing, tapered roller thrust bearing, needle roller thrust bearing, thrust spherical roller bearing, combination cylinder roller/taper roller bearing, roller bearing (track runner bearing) and calibration roller unit (indexing roller unit), or their combination.At least one parts of this bearing, for example the rolling body of bearing or bearing ring can comprise according to bearing steel of the present invention.
This bearing can be for being selected from the combination of spot contact bearing and the roller bearing of upper group.
The material thickness that this bearing can have is 0～150mm, for example 0～80mm.Therefore, the material thickness that this bearing can have is 0～45mm, and the material thickness that for example 15～45mm, or this bearing has is 45mm or higher, for example 45～80mm, or 45～150mm.
The above-mentioned first aspect present invention that relates to can also and be associated about the bearing of the second aspect present invention of bearing about the discussion of bearing steel.About bearing referring to these discussion herein.
Embodiment
In following comparative example, will be understood that and understand advantage of the present invention.It should be understood that included embodiment is in order to deepen the understanding of the present invention, and embodiment should not be construed and limits by any way scope of the present invention.
Use two steel stove (steel heat) A and B to cast steel ingot A and B.This steel ingot A and B are forged into the circular billet of 350mm.This steel billet A and B are cut and are machined into rotation beam type goods A and B.Use comprises that the conventional bainite conversion cycles that salt bath transforms carries out bainite sclerosis to these goods A and B at 235 ℃.By hard state cutting (hard turning), polishing, polishing, make these goods A and B.The goods A obtaining from stove A and B and the chemical composition of B are open table 1.Goods A as a comparison.
Table 1: the chemical composition of the bearing steel obtaining from stove A (contrast) and B
Figure BDA0000416700700000051
As shown in Table 1, the difference of goods A and B is, the phosphorus content in goods B is starkly lower than goods A; The phosphorus content that goods A has is 2.8 times of phosphorus content of goods B.Also the sulphur content that can find out goods B from table 1 is 2.5 times of sulphur content of goods A.In addition, the Al content in goods B is higher than the goods A17% of comparative.When A and B are compared, the content of other element is identical or close.
Rotating beam Fatigue Test and Staircase test (stair case test):
Several goods A and B are tested under 1060MPa constant pressure level, and manufacture stair.This test result as depicted in figs. 1 and 2.From this test and result, can infer that the median life (median life) of article according to the invention B in constant pressure test is at least five times of compared products A.
As shown in Figure 2, the Staircase test of goods A and B shows, A compares with compared products, and article according to the invention B significantly improves aspect safe range of stress.
From test, it is evident that to have according to the bearing steel of the chemical composition of goods B in table 1 and make its character be able to sizable improvement, this character comprises improved fatigue strength.For example, infer that low phosphorus content produces wholesome effect to improved fatigue strength.
According to an embodiment of the invention, this bearing steel can comprise the carbon of 0.9～1.1 % by weight, the molybdenum of the phosphorus of 0.004～0.007 % by weight, 0.5～0.7 % by weight and optionally, other alloying element (one or more), and surplus is iron or iron and impurity.This bearing steel has high-fatigue strength.
According to another implementation of the invention, this bearing steel can comprise the carbon of 0.9～1.1 % by weight, the molybdenum of the phosphorus of 0.004～0.007 % by weight, 0.5～0.7 % by weight, the sulphur of 0.002～0.016 % by weight and optionally, other alloying element (one or more), surplus is iron or iron and impurity.This bearing steel has high-fatigue strength.

Claims (13)

1. a bearing steel, it comprises carbon, 0.007 % by weight or the phosphorus still less of at least 0.6 % by weight and optionally, other one or more alloying elements; Surplus is iron or iron and impurity.
2. bearing steel according to claim 1, wherein the content of phosphorus is below 0.007 % by weight, preferably in the scope of 0.004～0.007 % by weight.
3. bearing steel according to claim 1 and 2, wherein the content of carbon is 0.6～1.5 % by weight.
4. bearing steel according to claim 3, wherein the content of carbon is 0.8～1.1 % by weight.
5. according to the bearing steel described in any one in claim formerly, it also comprises the sulphur as alloying element, and its content is 0.02 % by weight or still less, preferably 0.002～0.016 % by weight.
6. according to the bearing steel described in any one in claim formerly, it also comprises the aluminium as alloying element, and its content is 0.015 % by weight or more.
7. according to the bearing steel described in any one in claim formerly, it also comprises the molybdenum as alloying element, and its content is 0.1～0.7 % by weight, preferred 0.4～0.7 % by weight, and 0.5～0.6 % by weight most preferably.
8. according to the bearing steel described in any one in claim formerly, it comprises the carbon of 0.9～1.1 % by weight, the molybdenum of the phosphorus of 0.003～0.007 % by weight, 0.5～0.7 % by weight and the sulphur of 0.002～0.016 % by weight.
9. according to the bearing steel described in any one in claim formerly, wherein said bearing steel has bainite structure.
10. according to the bearing steel described in any one in claim formerly, wherein other alloying element of optional one or more is selected from Si, Mn, S, Cr, Ni, Mo, V and Al, or their combination.
11. 1 kinds of bearings, it comprises the bearing steel according to claim 1.
12. bearings according to claim 11, the material thickness that wherein said bearing has is 45mm or lower, preferably 15～45mm.
13. bearings according to claim 11, the material thickness that wherein said bearing has is 45mm or higher, preferably 45～80mm.
CN201280024073.3A 2011-05-17 2012-05-16 Improved bearing steel Pending CN103547696A (en)

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PCT/SE2012/000075 WO2012158089A1 (en) 2011-05-17 2012-05-16 Improved bearing steel

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106636942A (en) * 2016-11-09 2017-05-10 芜湖市永帆精密模具科技有限公司 Rolling fatigue resistant bearing steel ball and preparation method thereof
CN106834956A (en) * 2016-11-09 2017-06-13 芜湖市永帆精密模具科技有限公司 A kind of anti-friction bearing steel ball and preparation method thereof
CN106834955A (en) * 2016-11-09 2017-06-13 芜湖市永帆精密模具科技有限公司 A kind of high intensity bearing steel ball and preparation method thereof
CN107012405A (en) * 2017-03-27 2017-08-04 芜湖市永帆精密模具科技有限公司 A kind of high rigidity low-carbon bearing steel ball
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