我厂生产的合金工具钢(CrwMn,CrMn,9SiCr等)自采用超声波探伤检验以来合格率很低,尤其是一轧材合格率更低,仅80年10月～81年5月探伤由610Kg锭轧成≥100元钢材16批(只探伤供军工厂使用的钢材)就有10批有严重伤波,其波型类似白点的伤波,波峰清晰而尖锐,脉冲数量也多(图1)。但这些钢材经正规物理检验却没发现严重问题,只是在断口上有疏松 Our factory production of alloy tool steel (CrwMn, CrMn, 9SiCr, etc.) since the use of ultrasonic flaw detection test pass rate is very low, especially a pass rate lower, only 80 years in October to 81 in May testing by the 610Kg ingot Rolled into ≥ 100 yuan 16 steel batch (only for the detection of steel used in the military plant) there are 10 batches of severe injury, the wave-like white injury wave, clear and sharp peaks, pulse number is also more (Figure 1) . However, the formal physical examination of these steel but did not find a serious problem, but loose in the fracture