某公司生产的32CrMo4钢射孔枪管探伤合格率一直很低，通过宏、微观形貌分析、化学成分分析、低倍检验以及热处理工艺分析等方法对废品射孔枪管进行了深入的检查和分析。结果表明：不合格的射孔枪管含有纵向裂纹，这些裂纹是在淬火过程中，由于实际生产中为降低生产成本和减少污染，用水淬取代了油淬，而水淬应力过大极易使射孔枪管产生裂纹，从而大大降低了产品的合格率。通过降低射孔枪管钢材料的碳含量，用26CrMo4钢替代32CrMo4钢能有效提高产品的探伤合格率，同时也能满足射孔枪管的原使用要求。

The pass rate with ultrasonic inspection for 32CrMo4 steel perforating gun pipe of a company was so low, and the disqualified perforating gun pipe had been tested and studied in depth by means of macro and micro morphology analysis, macrostructure test and heat treatment progress analysis. The result show that the disqualified perforating gun pipe had longitudinal cracks which caused by quenching with water instead of oil in actual production for decreasing cost and pollution. However, quenching with water could easily caused cracks for over stress, so the pass rate of the perforating gun pipe had been reduced greatly. According to reducing carbon content, using 26CrMo4 steel instead of 32CrMo4 steel could improve the pass rate and met with the original using requirement of performating gun pipe.