轴承的原材料是钢材，钢材的质量直接影响轴承生产后的质量，因此对轴承钢的要求相当严格。提出了轴承钢冶金质量的基本要求。Bearingrawmaterialissteel,thequalityofsteeldirectlyaffectsthequalityofbearingafterproduction,sotherequirementsofbearingsteelisquitestrict.Thebasicrequirementsformetallurgicalqualityofbearingsteelareputforward.高碳铬轴承钢是一种常用的镇江SKF轴承钢。它含有约1个百分点的碳，1.5个百分点的铬和少量的锰和硅过共析钢。铬能提高钢的回火淬透性、热处理性能、***均匀性和稳定性，改变钢的抗锈性和磨削性能。HighcarbonchromiumbearingsteelisacommonlyusedZhenjiangSKFbearingsteel.Itcontainsabout1percentagepointsofcarbon,1.5percentagepointsofchromiumanda***allamountofmanganeseandsiliconhypereutectoidsteel.Chromiumcanimprovethetemperinghardenability,heattreatmentperformance,microstructureuniformityandstabilityofsteel,andchangetherustresistanceandgrindingperformanceofsteel.当铬含量超过1.65时，残余奥氏体含量增加，硬度和尺寸稳定性降低，碳化物不均匀性增加，冲击韧性和疲劳强度降低。因此，高碳铬轴承钢中的铬含量一般控制在1或65个百分点以下。只有严格控制轴承钢的化学成分和硬度，才能通过热处理工艺获得满足镇江SKF轴承***和性能的轴承。Whenchromiumcontentexceeds1.65,retainedaustenitecontentincreases,hardnessanddimensionalstabilitydecrease,carbideinhomogeneityincreases,impacttoughnessandfatiguestrengthdecrease.Therefore,chromiumcontentinhighcarbonchromiumbearingsteelisgenerallycontrolledbelow1or65percentagepoints.OnlybystrictlycontrollingthechemicalcompositionandhardnessofbearingsteelcanthebearingsatisfyingthestructureandpropertiesofZhenjiangSKFbearingbeobtainedbyheattreatmentprocess.滚动轴承钢需要高尺寸精度，因为大多数轴承部件须由压力形成。为了节省材料，提高劳动生产率，大多数轴承环锻造成冷镦或热轧球，线圈也通过冷镦成形。如果钢的尺寸精度不高，则无法准确计算冲裁件的尺寸和重量，无法保证轴承零件的质量，容易造成设备损坏和***。Rollingbearingsteelrequireshighdimensionalaccuracybecausemostbearingpartsmustbeformedbypressure.Inordertos***ematerialsandimprovelaborproductivity,mostbearingringsareforgedtoformcoldupsettingorhot-rolledballs,andthecoilsarealsoformedbycoldupsetting.Ifthedimensionaccuracyofsteelisnothigh,thesizeandweightofblankingpartscannotbeaccuratelycalculated,thequalityofbearingpartscannotbeguaranteed,andequipmentdamageanddeathcaneasilybecaused.钢的纯度是指钢中非金属夹杂物的数量和纯度较高，钢中的夹杂物减少。例如，轴承钢中氧化物和硅酸盐的***夹杂物导致早期疲劳剥落和镇江SKF轴承寿命显著降低。特别是脆性夹杂物在加工过程中容易从金属基体上脱落，严重影响轴承零件加工后的表面质量，对轴承零件的损伤大。因此，为了提高轴承的使用寿命和可靠性，须降低轴承钢中夹杂物的含量。Thepurityofsteelmeansthatthequantityandpurityofnon-metallicinclusi***insteelarehighandtheinclusi***insteelarereduced.Forexample,harmfulinclusi***ofoxidesandsilicatesinbearingsteelsleadtoearlyfatiguespallingandasignificantreductioninthelifeofZhenjiangSKFbearings.Especiallybrittleinclusi***areeasytofallofffromthemetalmatrixintheprocessofmachining,whichseriouslyaffectsthesurfacequalityofbearingpartsaftermachiningandcausesgreatdamagetobearingparts.Therefore,inordertoimprovetheservicelifeandreliabilityofbearing,itisnecessarytoreducethecontentofinclusi***inbearingsteel.轴承钢的低速率结构是指一般的孔隙率、中点孔隙率和平坦度。显微***（高功率）由退火结构、碳化物网络、带状和液态析出物组成。碳化物是液态的，硬脆的，其危害性与脆性夹杂物相同。网状碳化物降低了镇江SKF轴承钢的冲击韧性，导致***不均匀、淬火、变形和开裂。带状碳化物影响退火和淬火回火***和接触疲劳强度。低速和高速结构的质量对滚动轴承的性能和使用寿命有很大的影响。因此，在轴承材料标准中，对低利率和高利率的结构有严格的要求。轴承的原材料是钢材，钢材的质量直接影响轴承生产后的质量，因此对轴承钢的要求非常严格。提出了轴承钢冶金质量的基本要求。Thelowratestructureofbearingsteelreferstothegeneralporosity,midpointporosityandflatness.Themicrostructure(highpower)c***istsofannealingstructure,carbidenetwork,ribbonandliquidprecipitates.Carbideisliquid,hardandbrittle,anditsharmfulnessisthesameasthatofbrittleinclusion.ThenetworkcarbidereducestheimpacttoughnessofZhenjiangSKFbearingsteel,resultinginunevenmicrostructure,quenching,deformationandcracking.Zonalcarbidesaffectannealingandquenchingtemperingstructureandcontactfatiguestrength.Thequalityoflowspeedandhighspeedstructurehasagreatinfluenceontheperformanceandservicelifeofrollingbearings.Therefore,inthebearingmaterialstandard,therearestrictrequirementsforthestructureoflowinterestratesandhighinterestrates.Bearingrawmaterialissteel,thequalityofsteeldirectlyaffectsthequalityofbearingafterproduction,sotherequirementsofbearingsteelareverystrict.Thebasicrequirementsformetallurgicalqualityofbearingsteelareputforward.文章来自：镇江SKF轴承www.wh-Thearticleisfrom:ZhenjiangSKFbearingwww.wh-文章来自：镇江INA轴承a-Thearticleisfrom:ZhenjiangINAbearinga-文章来自：镇江NSK轴承Thearticleisfrom:ZhenjiangNSKbearing***：524085168电话：0510-81207777手机：13311666672)