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      1.Materials of Bearings

      The materials of the race and ball of bearing require enough hardness and the following qualities:
      (1). Large fatigue strength against repeated stress due to fatigue fracture of the race surface which governs the life of the bearings.
      (2). High limit of elasticity and high yield strength to prevent deformation when a large load is applied per unit area.
      (3). Large abrasion resistance against sliding friction between the retainer and the ball.
      (4). High strength against crack due to impact load and failure caused by improper fitting etc.
      (5).Small secular change in dimension and shape due to change of structure or internal stress.
      GCr15 Steel <JIS G4805>(High carbon chromium bearing steel) satisfies the above comparatively well, and its chemical composition is shown in the following table.
       

      Chemical composition of high carbon chromium bearing steel 

      Class Standard Symbol                                                    Chemical Composition (%)
      C Si Mn P S Cr
      1 GB GCr15 0.98-1.10 0.15-0.35 <0.50 <0.025 <0.025 1.30-1.60
      DIN 100Cr6
      ASTM E5200
      JIS SUJ2
      2 GB 9Cr18 0.98-1.10 <1.00 <1.00 <0.025 <0.025 16.00-18.00
      DIN X105CrMO17
      ASTM 440C
      JIS SUC440C

      In order to maitain uniform qualit of materials, FK keeps fully equipped installations and performs strict acceotance tests and inspections based on the strict acceptance standards in addition to JIS-standards. 

      Kinds of test done at the FK are mainly chemical analysis, magnetic exploration, ultrasonic exploration, corrosion by strong acid, inspection of structure by naked eyes, inspection of structure by microscope, crusher test and hardness etc.


      2.Material of the Cage and the Rivet

       The material of cage is JIS G3141(Cold rolled carbon steel sheet and strip)SPCC, and it is formed by the press.
      The material of the rivet is JIS G3507 (Low carbon steel wire rods)SWRCH 12A.
       

      3.Materials of Housings

      The material of the housings is FC200 JIS G5501 (Gray iron casting) and the mechanical properties are shown in the following table. 

                                            Mechanical properties of Gray cast iron HT200 

      symbol

      Thickness
      (mm)

      Dia. Of
      testing bar
      (mm)

      Tension test

      Traverse braking
      Test

      Pressure
      Strength

      Hardness
      Test

      Tensile
      Strength

      Bender
      Strength

      Deflection

       

      Hardness

      (kgf/mm2)

      (kgf/mm)

      (mm)

      kgf/mm2

      (HB)

      HT200
      (FC200)

      Over 6-8

      13

      Over 23

      53

      1.8

      75

      187-255

      Over 8-15

      20

      Over 22

      45

      2.5

      75

      170-241

      Over 15-30

      30

      Over 20

      40

      2.5

      75

      170-241

      Over 30-50

      45

      Over 17

      34

      3.0

      75

      170-241

      Over 50

      60

      Over 16

      31

      4.5

      75

      163-229

      Other Materials of Housings

      Symbol

      JIS number

      FCD40(QT400)

      JIS G5502

      SPCC(08)

      JIS G3141

      SUS304

      JIS G4304

      4.Materials of Other Components

      Components

      Materials used

      JIS symbols

      JIS number

      Sleeve for adapter

      Carbon steel for machine structural use

      S25C

      JIS G4051

      Nut for adapter

      Carbon steel for machine structural use

      S25C

      JIS G4051

      Washer for adapter

      Cold rolled carbon steel sheet and strip

      SPCC

      JIS G3141

      Oil seal

      Synthetic nitrile rubber

      -

      -

      Slinger

      Cold rolled carbon steel sheet and strip

      SPCC

      JIS G3141

      Hexagon set screw

      Nickel chromium molybdenum steel

      SCM 435

      JIS G4105

      Hexagon wrench key

      Nickel chromium molybdenum steel

      SNCM630

      JIS G4103

      Grease nipple

      Free cutting brass bar

      C3604

      JIS H3250

       

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