连铸坯的低倍检验方法是检验连铸坯的凝固组织以及宏观缺陷分布情况的一种方法。本文将几种常用的低倍检验的方法进行了分析与对比，得出在实验室条件下冷酸腐蚀是最简单、最实际的一种方法。本文针对某钢厂的低碳钢连铸坯进行冷酸腐蚀实验探索，将一些传统的腐蚀剂进行了对比，发现针对本实验钢种的实验效果不是特别理想。在腐蚀后凝固组织信息显示的比较模糊，并且柱状晶和等轴晶交界不易区分。因此针对传统的腐蚀剂进行了改良，在硝酸去离子水溶液中加入了一定比例的酒精、硫酸铁和十二烷基苯磺酸钠，针对本实验的低碳钢种能够得到清晰的凝固组织信息。
The method of low times test is used to test the solidification structure and the distribution of macro defect of the continuous casting slab. In this paper, several common methods of low times test are analyzed and compared, and then we conclude that the cold acid corrosion is the simplest and most practical method for laboratory condition. This paper aims to explore the corrosion of cold acid for the low carbon steel; however, we got unideal results after we used some traditional corrosion for this steel. Since the information of solidification structure was fuzzy, the crystal and equal axial grain have unclear boundary. So I make some improvement for the traditional corrosion. Anhydrous alcohol, ferric sulfate and sodium dodecyl benzene sulfonate are added to the aqueous solution of nitric acid in a certain proportion. Consequently, we get clear solidification structure information.
