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绪言 多年来在包钢500吨氧气顶吹平炉下铸法生产的20~#无缝钢管管坯及60U_(74)重轨钢成品上一直存在低倍不合格率和超声波探伤检出率较高的现象。并且质量不合部位多集中在相当于钢锭的尾部位置,这种现象也见于国内外一些其它厂家的研究报导。研究结果表明,这些缺陷是由钢中粗大的非金属夹杂引起的。因此,弄清这类夹杂的特征、形成机理及去除方法非常重要。众所周知,钢中通常存在有不同形状和数量
Introduction Over the years Baotou Iron and Steel 500 tons top-blowing furnace blast furnace production of 20 # seamless steel tube and 60U_ (74) heavy rail finished steel products have low failure rate and ultrasonic flaw detection rate is high The phenomenon. And the quality of substandard parts are more concentrated in the tail position of the ingot, this phenomenon is also seen in some other domestic and foreign manufacturers research reports. The results show that these defects are caused by the coarse non-metallic inclusions in the steel. Therefore, it is important to understand the characteristics of these inclusions, formation mechanism and removal method. As we all know, there are usually different shapes and numbers of steel