非金属夹杂物检验的国家标准修订在即，为完善标准，对GB/T 10561—2005《钢中非金属夹杂物含量的测定——标准评级图显微检验法》进行了详细研读，并与旧版国家标准及相应的国际标准进行了对比。结果表明：GB/T 10561—2005较旧版GB/T 10561—1989更加完善，其规定了根据夹杂物的长度、厚度、直径、颗粒数及分布对夹杂物进行评级，方便试验人员的操作，有利于准确评价钢材的质量；GB/T 10561—2005在文本编辑、原理公式、实际检验规则、结果表示、图谱制作等方面存在需要进一步完善之处。

The national standard of non-metallic inclusion inspection will be revised soon. In order to improve the standard, the GB/T 10561—2005 Steel—Determination of content of nonmetallic inclusions—Micrographic method using standard diagrams was studied in detail, and compared with the old national standard and corresponding international standards. The results show that GB/T 10561—2005 is more perfect than the old version of GB/T 10561—1989. It stipulates that the inclusion should be graded according to the length, thickness, diameter, particle number and distribution of inclusions, which is convenient for the test personnel to operate and is conducive to the accurate evaluation of steel quality. GB/T 10561—2005 needs to be further improved in the aspects of text editing, principle formula, actual inspection rules, result expression and atlas making.