本文就1919年以来,我所对包钢无缝管坯生产交货低倍检验中出现的因尾部夹杂缺陷(主要为Al_2O_3)不合格比率甚高的现象,对20~#管坯钢尾部夹杂缺陷做了系统的调查和试验研究。 在过去研究的基础上,文中重点介绍1982年在500吨平炉正常生产的四炉五罐20~#钢尾部低倍调查结果。结果表明:研究结果与1980—1982年的生产统计数据相吻合,说明该项调查有代表性。未发现钢的化学成份,吹氧与不吹氧平炉及保炉渣加入方法等工艺因素与低倍内在质量有明显关系。但发现270吨罐内温度偏高(1590—1610℃),加铝量合适(730～757g/t)者,上述缺陷分布高度降低。 1982年的改善钢锭包部保温性能试验结果证实:帽部挂绝热板加发热剂锭与砖砌帽加保温剂锭相比,该缺陷有明显降低。 This article from 1919 onwards, I produced on Baotou Steel seamless tube delivery times low inspection appeared due to tail inclusion defects (mainly Al_2O_3) unqualified rate is very high phenomenon, 20 ~ # tube steel tail mixed Defects made a systematic investigation and experimental study. On the basis of past research, this paper focuses on the results of the low magnification survey of 20 # steel tailings in four furnaces and five cans, which were normally produced in a 500-ton open hearth furnace in 1982. The results show that the findings are in line with the production statistics from 1980 to 1982, indicating that the survey is representative. No chemical composition of steel found, oxygen blowing and not blowing oxygen furnace furnace slag and other methods of adding factors such as low internal internal quality obviously. However, it was found that the above-mentioned defect distribution height was decreased when the temperature inside the 270-ton tank was high (1590-1610 ° C) and the aluminum content was suitable (730-757 g / t). In 1982, the test results of improving the thermal insulation performance of the ingot section confirmed that the defects were significantly reduced compared with the masonry thermal insulating agent block added with the thermal insulating agent added to the cap portion.