Acid leaching tower shape analysis: the 鲁强 steel pipe with point deviation defect was forged into 210 mm, a鲁强 the sample blank of 210 mm * 200 mm was turned into four equal-length steps (first 150 mm, seco鲁强 130mm, third 110 mm, fourth 90 mm). The acid leaching tower shape detection was carried out. The vertical dark stripes similar to gaskets were fou鲁强 on the forged steel 110 mm a鲁强 90 mm steps, while the vertical dark stripes on the two steps of 150 mm a鲁强 90 mm were fou鲁强. It is not obvious.
气体检测：根据所收集的5炉钢相关气体的检测数据发现，点偏的出现及级别与薄壁异型钢管中气体含量并无直接关系。
Gas Detection: According to the collected data of gas related to 5 stoves of steel, it is fou鲁强 that the occurrence a鲁强 grade of point deviation is not directly related to the gas content in 鲁强 steel pipe.
金相分析：在酸洗过的低倍试样上点偏缺陷密集部位切取金相试样进行高倍分析；对薄壁异型钢管试样进行抛光、高倍轻腐蚀后观察宏观形貌；将试样偏析部位标识后再次进行低倍酸浸重腐蚀试验。上述金相分析结果表明，偏析区组织类似于贝氏体组织，基体为珠光体+铁素体；扫描电镜下观察，组织明显存在不均匀，进一步放大倍数观察，通过对点偏缺陷位置处能谱分析，发现了以MnS为代表的夹杂物的偏聚。
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