Super304H奥氏体不锈钢晶间腐蚀的研究进展

摘要/Abstract

摘要： Super304H奥氏体不锈钢(0.10C-18Cr-9Ni-3Cu-0.4Nb-0.08N)为超超临界机组过热器和再热器的首选材料之一,由于该钢含碳较高,服役温度(～650℃)为M₂₃C₆沿晶界析出的敏化温度,如何避免晶间腐蚀发生是Super304H钢主要研究课题。本文综述了国内外Super304H钢晶间腐蚀倾向的研究进展,包括晶间腐蚀机理,钢中合金元素特别是Nb/C,双固溶处理、稳定化处理,焊接工艺、600～700℃高温时效对该钢晶间腐蚀的影响和Super304H钢晶间腐蚀敏感性的表征方式。展望了Super304H钢的研究方向。

国家自然科学基金(G No. 50871041)和南方电网公司科技项目(K-GD2012-385)资助

关键词: Super304H奥氏体不锈钢, 超超临界机组, 晶间腐蚀敏感性, 研究进展

Abstract: The Super304H austenite stainless steel (0. 10C-18Cr-9Ni-3Cu-0. 4Nb- 0. 08N) is one of first selected materials for superheater and reheater tubes of ultra-supercritical unit. As the steel has higher carbon content and its service temperature ( ~ 650 °C ) is the sensitizing temperature of M₂₃C₆ precipitating along grain boundary, how to avoid the occurrence of intergranular corrosion is a main research topic for Super304H steel. The research progress for intergranular corrosion susceptibility of Super304H steel at home and abroad is summarized in this article including intergranular corrosion mechanism, effect of alloy elements in steel especially Nb/C, double solid-solution treatment, stabilizing treatment, welding process and 600 ~ 700 ℃ high temperature aging on intergranular corrosion of this steel, and characterization methods for sensitiveness of intergranular corrosion of Super304H steel. The research and development of Super304H steel is prospected.

张春雷, 熊夏华, 郑志军, 钟飞, 高岩. Super304H奥氏体不锈钢晶间腐蚀的研究进展[J]. 特殊钢, 2013, 34(3): 34-38.

Zhang Chunlei, Xiong Xiahua, Zheng Zhijun, Zhong Fei, Gao Yan. Research Progress on Intergranular Corrosion Resistance of Super304H Austenite Stainless Steel[J]. Special Steel, 2013, 34(3): 34-38.

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