The macro and micro analysises of the leaking tubes of the ND steel economizer showed that the leakage was caused by the sulfuric acid dew point corrosion which started from the weld seam.

• 经过对ND钢省煤器管束泄漏管子的宏观及微观分析，表明管子泄漏是首先从焊缝开始的硫酸露点腐蚀引起的；