对一起国产低碳钢螺旋焊管的断裂失效进行了分析。通过宏观、微观的检查及化学成分、力学性能的测试，发现是应变时效脆化和蒸汽中残留NaOH碱脆联合作用的结果，并提出了相应的措施。 A domestic low-carbon steel spiral welded pipe fracture failure analysis. Through macroscopic and microscopic examination, chemical composition and mechanical property test, it was found that it was the result of strain aging embrittlement and residual NaOH alkali-brittle interaction in steam, and the corresponding measures were put forward.