用直接腐蚀法测定30CrMnsiA钢的实际晶粒度我们进行了多种试验,探索出一种理想的腐蚀剂。这种腐蚀剂配制简便,使用时间长,试验重现性好,有良好的衬度,是测定含Mn、Si钢种实际晶粒度的一种较好的腐蚀剂。 1 配方:苦味酸 5克;丙酮 90～100毫升; Determination of the actual grain size of 30CrMnsiA steel by direct corrosion We conducted various tests to find out an ideal etchant. The etchant has the advantages of simple preparation, long service life, good test reproducibility and good contrast, and is a good etchant for determining the actual grain size of Mn and Si containing steel. 1 formula: picric acid 5 grams; acetone 90 ~ 100 ml;