应用示波冲击试验技术测量了不同终轧温度下HP2 95钢板在系列温度下的冲击韧性。测量了冲击断口试样的横向扩张量 ,利用扫描电镜分析了示波冲击断口形貌。结果表明 ,终轧温度提高 ,钢的韧脆转变温度提高 ,钢的冲击韧性下降 ,裂纹扩展功下降。示波冲击温度越低 ,终轧温度对韧性的影响越显著。冲击韧性与冲击断口的横向扩张量和断口的形貌具有较好的对应关系 The impact toughness of HP2 95 steel under different temperatures was measured by oscillometric impact test. The transverse expansion of the impact fracture specimen was measured. The morphology of the impact fracture was analyzed by scanning electron microscopy. The results show that the finishing temperature increases, the ductile and brittle transition temperature of steel increases, the impact toughness of steel decreases, and the crack propagation work decreases. The lower the impact temperature, the more significant the effect of the finish rolling temperature on the toughness. Impact toughness and impact fracture transverse expansion and fracture morphology has a good correspondence