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一、前言为了提高65Mn钢板使用前的实物质量,采取了超标准要求的措施来检查其表面缺陷。在轧成3mm厚成品钢板后,用浓度为18～24％的H_2SO_4溶液酸洗去掉氧化皮(视酸溶液浓度大小而决定酸洗时间,一般为15min左右),得到表面整洁的成品钢板,但在某些酸洗后的钢板上,发现板面上出现若干大小不一、有长短轴之分的凸泡,如图1所示。具有凸泡钢板被判为废品。为此进行了一系列的检验鉴定工作,证明了该种气泡是由于钢锭表层下存在着大量非金属夹杂物、而又酸洗过度的结果。据此提出了改进的途径。
I. Preface In order to improve the physical quality of 65Mn steel before use, we adopted the measures to exceed the standard requirements to check the surface defects. After rolled into 3mm thick finished steel plate, the oxide scale is removed by pickling with H 2 SO 4 solution with a concentration of 18-24% (the pickling time is determined according to the acid solution concentration and is usually about 15 minutes) to obtain a finished steel plate with a clean surface, In some pickled steel, it is found that there are a number of blisters on the board surface, which have different sizes and lengths, as shown in FIG. 1. With a convex bubble plate was sentenced as waste. For this reason, a series of inspection and identification work has been carried out, which proves that the bubble is caused by a large amount of nonmetallic inclusions under the surface of the ingot, which results in excessive pickling. Based on this, the ways of improvement are put forward.