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    Steel Balls Material Standard

    GB308-89 & ISO3290 STANDARD
    Grade Vdws ?Sph Ra Vdwl Gauge space Gauge Sub-gauge space Sub-gauge
    G3 0.08 0.08 0.13 0.012 0.5 -5~-0.5,0+0.5~+5 0.1 -0.2,-0.1,0,+0.1,+0.2
    G5 0.13 0.13 0.25 0.02 1 -5~-1.0,+1~+5 0.2 -0.4,-0.2,0,+0.2,+0.4
    G10 0.25 0.25 0.5 0.025 1 -9~-1.0,+1~+10 0.2 -0.4,-0.2,0,+0.2,+0.4
    G16 0.4 0.4 0.8 0.032 2 -10~-2.0,+2~+10 0.4 -0.8,-0.4,0,+0.4,+0.8
    G20 0.5 0.5 1 0.04 2 -10~-2.0,+2~+10 0.4 -0.8,-0.4,0,+0.4,+0.8
    G28 0.7 0.7 1.5 0.05 2 -12~-2.0,+2~+12 0.4 -0.8,-0.4,0,+0.4,+0.8
    G40 1 1 2 0.08 4 -16~-4.0,+4~+16 0.8 -1.6,-0.8,0,+0.8,+1.6
    G60 1.5 1.5 3 0.10 5 -20~-5.0,+5~+20 1 -2,-1,0,+1,+2
    G100 2.5 2.5 5 0.125 10 -40~-10.0,+10~+40 2 -4,-2,0,+2,+4
    G200 5 5 10 0.2 15 -60~-15.0,+15~+60 3 -6,-3,0,+3,+6
    CHEMICAL COMPOSITION
    Material CHEMICAL COMPOSITION (%)
    C Si Mn P S Ni Cr Mo Cu
    AISI440C 0.95-1.20 1.00max 1.00max 0.040max 0.030max 0.60max 16.0-18.0 0.75max ----
    AISI420 0.42-0.50 1.00max 1.00max 0.040max 0.030max 1.00max 12.5-14.5 ---- 0.30max
    AISI304 0.08max 1.00max 2.00max 0.045max 0.030max 8.00-10.5 18.0-20.0 ---- ----
    AISI316 0.08max 1.00max 2.00max 0.045max 0.030max 10.0-14.0 16.0-18.0 2.00-3.00 ----
    AISI52100 0.95-1.10 0.15-0.35 0.50max 0.025max 0.025max ---- 1.30-1.60 ---- ----
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