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硬度测定方法  Methods for measuring the hardness of steel balls

  球磨钢球的硬度值按照中华人民共和国国家标准GB230-80《金属洛氏硬度试验方法》之规定制度取试样进行测定。
  钢球平均表面硬度值的测定方法为:在每个样品钢球的表面上任意测定四个点的硬度值,取其算术平均值作为该样品的平均表面硬度值。
  钢球平均体积硬度值的测定方法为:每个样品钢球测定五个点的硬度值,其中一个点在钢球的表面上,另四个点分别在钢球同一全剖面上,另四个点分别在钢球同一全剖面上的3/4R 、1/2R、1/4R及球心处。钢球平均体积硬度按下式计算:  
    平均体积硬度=0.289 x 表面处之硬度值
       +0.437 x 3/4R处之硬度值
       +0.203 x 1/2R处之硬度值
       +0.063 x 1/4R处之硬度值
       +0.008 x 球心处之硬度
  我们认为在544VHN(500BHN)以上用洛氏硬度(RCHN)计量磨矿介质的硬度更为适当

Hardness values of balls are determined by making and testing samples according to the national standard of
China HRC Testing Method for Metals (GB230-80)
The average surface hardness of balls is measured in the way below:
First , determine the hardness values at 4 random points on the surface of each sample; secondly, get the arithmetic
average as the average surface hardness of this sample.
The average volumetric hardness of steel balls is measured in the way below:
To determine the hardness values at 5 points of each sample. One of these points is on the surface and other 4 are
placed reapectively on 3/4R 、1/2R、1/4R and the center on the same section of the sample. Then the average 
Volumetric hardness of balls can calculated from the following formula:
            A.V.H=0.289 x surface hardness
     +0.437 x hardness at 3/4R 
     +0.203 x hardness at 1/
     +0.063 x hardness at 1/4R 
     +0.008 x center hardness
We have proved that when the value is higer than 544VHN(500BHN), it is proper to use RCHN method to measure 
the hardness of grinding media

硬度转换表