CAJ | 학술논문

国内超超临界机组锅炉受热面高温段采用新型奥氏体不锈钢Super304H和HR3C，机组在停机检修时通常采用消防水对受热面外表面进行清洗。为了检验消防水中Cl-是否会引起新型奥氏体钢焊接接头腐蚀，通过模拟相似条件进行多批次浸蚀试验，对试样进行外观检查、表面渗透、金相检验、电镜扫描等检测与分析，未发现较高浓度Cl-溶液引起Super304H和HR3C不锈钢焊接接头腐蚀现象，为超超临界锅炉炉膛内部采用消防水清洗提供了有力的试验依据。
국내초초림계궤조과로수열면고온단채용신형오씨체불수강Super304H화HR3C，궤조재정궤검수시통상채용소방수대수열면외표면진행청세。위료검험소방수중Cl-시부회인기신형오씨체강한접접두부식，통과모의상사조건진행다비차침식시험，대시양진행외관검사、표면삼투、금상검험、전경소묘등검측여분석，미발현교고농도Cl-용액인기Super304H화HR3C불수강한접접두부식현상，위초초림계과로로당내부채용소방수청세제공료유력적시험의거。
The new-type austenitic stainless steel Super304H and HR3C have been used in the high-tempera-ture section of the heating surface for domestic ultra supercritical boilers. The outer surface of the heating sur-face is usually cleaned by fire water during shutdown of the units. In order to test whether the Cl-of fire water can cause stress corrosion of the new-type steel welded joints. Through batches of etch test under simulating similar conditions, the sample has been analyzed by using macroscopic examination, surface penetration, metallographic detection, electron microscope scanning and etc. It is not found that higher concentration Cl-solution can cause the corrosion of Super304H or HR3C welded joints. It provides a strong test basis that the furnace internal cleaning by fire water is feasible for ultra supercritical boilers.