通过对9S iCr钢质异型焊管轧辊脆性断裂原因的分析,提出轧辊表层薄层淬火次表层厚层等温淬火热处理新工艺。结果显示,采用热处理改进工艺后,使轧辊组织由较厚层的回火马氏体转变为表层为较薄的回火马氏体而次表层为较厚的下贝氏体的组织,解决了9S iCr钢轧辊在热处理和使用中出现的脆性断裂问题。 Based on the analysis of the causes of brittle fracture of 9S iCr steel profiled tube roll, a new isothermal quenching heat treatment process for the sub-surface thick layer quenched by the roll surface was proposed. The results show that the use of heat treatment to improve the process, the roll tissue from the thick layer of tempered martensite into a thin surface layer of tempered martensite and the lower surface of the lower bainite microstructure to solve 9S iCr steel roll in the heat treatment and use of brittle fracture.