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首页> 外文期刊>Journal of Materials Engineering and Performance >Correlation between molten vanadium salts and the structural degradation of HK-type steel superheater tubes
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Correlation between molten vanadium salts and the structural degradation of HK-type steel superheater tubes

机译：熔融钒盐与HK型钢过热器结构退化的关系

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摘要

HK steels are among the most used heat-resistant cast stainless steels, being corrosion-resistant and showing good mechanical properties at high service temperatures. These steels are widely used in reformer furnaces and as superheater tubes. During service, combustion gases leaving the burners come in contact with these tubes, resulting in corrosive attack and a large weight loss occurs due to the presence of vanadium, which forms low melting point salts, removing the protective oxide layer. In this work the external surface of a tube with dramatic wall thickness reduction was analyzed using light microscopy, scanning electron microscopy, and transmission electron microscopy. The identification of the phases was achieved by energy dispersive spectroscopy (EDS) analyses. The results showed oxides arising from the external surface. In this oxidized region vanadium compounds inside chromium carbide particles were also observed, due to inward vanadium diffusion during corrosion attack. A chemical reaction was proposed to explain the presence of vanadium in the metal microstructure.
机译：HK钢是最常用的耐热铸不锈钢之一，具有耐腐蚀性能，在高使用温度下显示出良好的机械性能。这些钢被广泛用于重整炉和过热管。在使用过程中，离开燃烧器的燃烧气体与这些管子接触，导致腐蚀侵蚀，并且由于钒的存在而导致大量重量损失，钒会形成低熔点盐，从而除去保护性氧化层。在这项工作中，使用光学显微镜，扫描电子显微镜和透射电子显微镜分析了具有显着壁厚减小的管的外表面。通过能量色散光谱（EDS）分析实现了相的鉴定。结果表明，氧化物从外表面产生。在该氧化区域中，由于腐蚀侵蚀过程中钒向内扩散，还观察到碳化铬颗粒内部的钒化合物。提出了一种化学反应来解释金属微结构中钒的存在。

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