析了大型钢制球罐裂纹的性质、形成和扩展的有关因素 ,讨论了球罐应力腐蚀的损伤机理 ,应力腐蚀开裂是与H2 S的质量分数和焊接应力等因素有关 .根据球罐损伤修复试验 ,提出了控制球罐损伤的措施 :焊后回火 ,消除应力 ,提高韧性 ;控制H2 S的质量分数小于 10× 10 - 6 ;定期开罐检查 ,及时修复等 The factors that cause the formation, propagation and expansion of the large-scale steel spherical tank crack are analyzed, and the damage mechanism of the stress corrosion of the spherical tank is discussed. The stress corrosion cracking is related to the mass fraction of H2 S and the welding stress, etc. According to the damage repair The measures to control the damage of the spherical tank were put forward: tempering after welding, eliminating the stress and improving the toughness; controlling H2S mass fraction less than 10 × 10 - 6;