GB231—84金属布氏硬度试验方法标准中告知,一般情况下测定布氏硬度值时,压头用标准钢球布氏硬度符号为HBS。当被测硬度值高于450时,压头需用硬质合金球,布氏硬度符号为HBW。 该文本中有一“注”布氏硬度值超过350HB时,钢球和硬质球所测结果明显不同。因未作说明或解释,读者不知明显不同之处在那呢?这里有一问题,既然所测结果明显不同,那么,当被测硬度值在350～450HB时,究竟使 GB231-84 metal Brinell hardness test method standard that, under normal circumstances, the determination of Brinell hardness, pressure head with a standard ball Brinell hardness symbol HBS. When the measured hardness value is higher than 450, the indenter needs hard alloy ball, and the Brinell hardness symbol is HBW. There is a “Note” in the text that when the Brinell hardness exceeds 350HB, the measured results of the ball and the hardball are significantly different. Because there is no explanation or explanation, readers do not know obvious difference in that? There is a problem, since the measured results were significantly different, then, when the measured hardness at 350 ~ 450HB,