以断裂失效H11合金钢轧辊为对象,研究其化学成分、硬度、微观组织和夹杂物特征,并对其失效原因进行分析。结果表明,失效轧辊中Cr和Mo的含量明显低于国家标准,导致辊颈表面硬度下降。轧辊微观组织中,存在超大型夹杂物和尺寸大于10μm的尖端夹杂物,破坏了材料组织的连续性,降低了材料的强度和韧性。 Fracture failure H11 alloy steel roll as the object, to study its chemical composition, hardness, microstructure and inclusion characteristics, and its failure causes were analyzed. The results show that the content of Cr and Mo in the failure roll is significantly lower than the national standard, resulting in the decrease of surface hardness of the roll neck. Rolling microstructure, there are large inclusions and the size of more than 10μm tip inclusions, destruction of the continuity of the material and structure, reducing the strength and toughness of the material.