300MW电站锅炉高温联箱裂纹原因分析
冯砚厅,郑相锋,姜运建,李文彬,孙澎,徐雪霞
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作者单位：河北省电力研究院
中文关键字：高温联箱 失效分析 12Cr1MoV 再热裂纹
英文关键字：boiler final superheater header failure Analysis 12Cr1MoV Reheat crack
中文摘要：采用宏观分析、力学分析、化学分析、金相检验、扫描电镜等方法对某电厂300MW电站锅炉的末级过热器联箱中间三通与主蒸汽焊口裂纹(材质为12Cr1MoV)进行失效分析，结果表明, 三通与主蒸汽焊口裂纹属于再热裂纹，结构不合理和焊接残余应力过大是造成泄漏的主要诱因。
英文摘要：Through methods, such as microscope analysis , mechanical analysis, chemical analysis, metallographic examination and scanning electron microscope etc ,the causes resulting in tee joint crack of 300MW power station boiler final superheater header (12Cr1MoV) have been analyzed. The result indicates the tee joint crack is the Reheat crack and the Irrational Structure and excessive Welding Residual Stress is the primarily inducement of tube joint crack