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结合多年实践介绍了中碳结构钢钢锭纵裂特征、与工具钢、某些Cr-Mo结构钢冷裂和高合金钢热裂的主要区别;论述了造成中碳结构钢钢锭纵裂的三大因素——亚共析钢铁素体膜的形成,铁素体膜中硬质点AlN的存在以及钢锭冷凝应力;提出了围绕三大因素应采取的消除纵裂的各种措施,这些措施已得到实际应用并已取得显著效益。
Combined with many years of practice, the paper introduces the longitudinal cracking characteristics of medium carbon structural steel ingot and the main differences between the hot cracking of tool steel and some Cr-Mo structural steel and high alloy steel; discusses the three major longitudinal cracking of medium carbon structural steel ingot Factors - The formation of hypoeutectoid ferrite film, the presence of hard-point AlN in the ferrite film, and the ingot condensing stress; Various measures to eliminate longitudinal cracking around the three factors are proposed, and these measures have been obtained Practical application and has achieved significant benefits.