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  • 硬度測量的圓形修正值表

    不同硬度制加到測試結果的不同直徑部件的修正值

    加到洛氏C,AD的修正值

    硬度   凸柱表面直徑     
    讀值 1/4 in 3/8 in 1/2 in 5/8 in 3/4 in 7/8 in 1 in 1-1/4 in 1-1/2 in
      6.4 mm 10 mm 13 mm 16 mm 19 mm 22 mm 25 mm 32 mm 38 mm
    20 6.0 4.5 3.5 2.5 2.0 1.5 1.5 1.0 1.0
    25 5.5 4.0 3.0 2.5 2.0 1.5 1.0 1.0 1.0
    30 5.0 3.5 2.5 2.0 1.5 1.0 1.0 1.0 0.5
    35 4.0 3.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5
    40 3.5 2.5 2.0 1.5 1.0 1.0 1.0 0.5 0.5
    45 3.0 2.0 1.5 1.0 1.0 1.0 0.5 0.5 0.5
    50 2.5 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5
    55 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0
    60 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 0
    65 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 0
    70 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0 0
    75 1.0 0.5 0.5 0.5 0.5 0.5 0 0 0
    80 0.5 0.5 0.5 0.5 0.5 0 0 0 0
    85 0.5 0.5 0.5 0 0 0 0 0 0
    90 0.5 0 0 0 0 0 0 0 0
    加到洛氏B,F及G的洛氏修正值
    硬度    凸柱表面直徑     
    讀值 1/4 in 3/8 in 1/2 in 5/8 in 3/4 in 7/8 in 1 in    
      6.4 mm 10mm 13mm 16 mm 19 mm 22 mm 25 mm    
                       
    0 12.5 8.5 6.5 5.5 4.5 3.5 3.0    
    10 12.0 8.0 6.0 5.0 4.0 3.5 3.0    
    20 11.0 7.5 5.5 4.5 4.0 3.5 3.0    
    30 10.0 6.5 5.0 4.5 3.5 3.0 2.5    
    40 9.0 6.0 4.5 4.0 3.0 2.5 2.5    
    50 8.0 5.5 4.0 3.5 3.0 2.5 2.0    
    60 7.0 5.0 3.5 3.0 2.5 2.0 2.0    
    70 6.0 4.0 3.0 2.5 2.0 2.0 1.5    
    80 5.0 3.5 2.5 2.0 1.5 1.5 1.5    
    90 4.0 3.0 2.0 1.5 1.5 1.5 1.0    
    100 3.5 2.5 1.5 1.5 1.0 1.0 0.5    

     

        當測試圓柱型樣本時,測試的準確性將受升降螺絲的對準線,V型樣品臺,壓頭,表面拋光度及圓柱的直線度的嚴重影響。這些修正值是大概的數值并代表的是平均值,最小到0.5。洛氏和表面洛氏值,還需要大量的實踐觀察。 

    The above tables are from ASTM E 18
    Reprinted from the Annual Book of STM Standards, copyright American Society for Testing and Materials.
    100 Harbor Drive, West Conshohocken , PA 19428-2959



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