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通过冷态试验，提出车轮钢中大型夹杂物的形成机理，一是浇注前期钢水从直孔型模底砖冲入模内后，会在中心液面上形成峰涌现象，将浮在液面上的大型夹杂物推向钢锭四周的凝固前沿，造成钢锭四周大型夹杂物富集带。另一是浇注后期，钢锭液面由于散热温度降低，钢水会依托浮在液面的大型夹杂物进行非均质形核、凝固，当包裹着大型夹杂物的凝固层达到一定的体积后，其比重大于钢水的比重时，就会沉入锭底，形成沉积锥大型夹杂物分布带。本文根据大型夹杂物形成机理，在生产中采取了相应的改进措施，使夹杂废品率由５．０７％降到２．０５％，下降了５０．６９％。
Through the cold test, the formation mechanism of large inclusions in the wheel steel is proposed. First, the molten steel in the pre-pouring stage will burst into the liquid level The large inclusions on the solidification front of the ingot around the ingot, resulting in large inclusions around the ingot enrichment zone. The other is pouring late ingot liquid level due to lower cooling temperature, the molten steel will rely on floating in the surface of large inclusions inhomogeneous nucleation, solidification, when wrapped with large inclusions in the solidified layer reaches a certain volume, its When the proportion is greater than the proportion of molten steel, it will sink into the ingot to form a sedimentary cone with large inclusions. According to the formation mechanism of large inclusions, this paper takes corresponding improvement measures in the production so that the rejection rate of inclusions will drop from 5.07% to 2.05%, a decrease of 50.69%.