【摘要】 对某输气管爆裂原因进行分析，结果表明硫化物应力腐蚀是输气管爆裂的根本原因；补焊工艺不当使焊缝产生了马氏体组织及高的残余应力，增大了焊区应力腐蚀敏感性更多还原

【Abstract】 A natural gas pipeline ruptured suddenly along the spiral\|weld seam under normal operation pressure. Investigation and laboratory examination indicated that the cracking was caused by sulfide stress corrosion cracking (SSCC). The examination results showed that martensite and high residual stress due to welding process by repair increased the susceptibility to SSCC\=更多还原