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Axle-centre AlloyPrecision Alloy 3J40Shock-proof & Wear Resistant axle-centre alloy(YB/T5243-1993)Usage: It is applied to produce the axle-centre of instrument and meter as well as the axle-centre of the staffGrade and Chemical Composition (see Table1) Table1 Grade and Chemical CompositionGradeChemical Composition (%)CPSMnSiFeCrA1CeNi3J400.030.0100.0100.100.200.5039.0~41.03.30~3.500.10~0.2BalanceBased on additionMechanical Property (see Table 2) Table 2 Mechanical PropertyStatueVickers Hardness/ HVCommended Heat TreatmentBend Test The radius of the mandrel is twice as the diameter of the alloyICold Drawing450~510Bend 90 degrees. No cracks and broken on the outside of the bendingCold Drawn & Aging780~830830~880880480~540 C Keep warm for 5hNote: 1.The default hardness classification of the alloy wire in cold drawing & aging status is class II.Physical Property (see Table 3 Table 5) Table 3 Coefficient of Linear ExpansionStateCoefficient of Linear Expansion/(10-6/K)20~55 C20~100 C20~200 C20~300 C20~400 C20~500 CSolid Solution12.2~12.712.4~12.512.6~12.813.0~13.113.5~13.613.8~14.0Solid Solution&aging11.0~11.511.9~12.012.0~12.212.4~12.512.7~12.813.1~13.3Cold Drawn & aging11.612.012.112.412.813.3Table 4 Modulus of Elasticity & Frequency Temperature CoefficientStateModulus of ElasticityTemperature Coefficient ?f/(10-6 C)Mechanical Quality Factor Q20 C20~-40 C20~100 CSolid Solution +80% Strain Rate176500~196000Solid Solution +80% Strain Rate+Aging 5h225500~235500-103~-106-104~-11049000~51000Table 5 Magnetic Susceptibility & ResistivityStateMagnetic SusceptibilityResistivity/( ?m)Density/(g/cm3)H=40KA/mH:80KA/mSolid Solution3.5~4.53.5~4.67.6Solid Solution+ Aging3.8~4.02.4~4.2Solid Solution+ Cold Drawing2.8~3.01.21Solid Solution +69% Strain Rate+Aging0.78Corrosion Resisting Property (See Table 5) Table 5 Corrosion Resisting PropertyStateSalt Fog TestLong-time Store in The AirCold Drawing+ Solid Solution+AgingNo corrosion after 240 hours (Tested by the buyer per JB1606)No corro