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首页> 外文会议>Corrosion conference and expo >High Chromium Stainless Steel for High-Temperature Corrosion Protection in Coal-Fired Boilers
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High Chromium Stainless Steel for High-Temperature Corrosion Protection in Coal-Fired Boilers

机译：高铬不锈钢，用于燃煤锅炉的高温腐蚀防护

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It is well-known that the installation of low NOx burner system and staged combustion techniques can cause unacceptably high wastage rates for carbon and Cr-Mo steels due to sulfidation attack in coal-fired boiler waterwall area. The current preferred approach for protecting these carbon or Cr-Mo steel waterwall tubes is the application of sulfidation-resistant weld overlay claddings. For some supercritical units, corrosion attack can take the form of preferential sulfidation penetration which could lead to circumferential cracking in waterwall tubes. Superheaters and reheaters, which are typically made of Cr-Mo steels or austenitic stainless steels, also rely on weld overlay claddings to provide protection against sulfidation, erosion-corrosion, and coal-ash corrosion. Chromium has been known to be the most important alloying element in weld overlay cladding for protection of boiler tubes against sulfidation, erosion-corrosion and coal-ash corrosion. For current boilers including both subcritical and supercritical units, Ni-based alloy 622 (ERNiCrMo-10) is the most widely used overlay alloy. The present paper discusses a high Cr Type 312 stainless steel as a low-cost alternate overlay alloy for protection of boiler tubes in coal-fired boiler application.
机译：众所周知，由于燃煤锅炉水冷壁区域的硫化作用，低NOx燃烧器系统和分级燃烧技术的安装会导致碳钢和Cr-Mo钢的浪费率过高。当前保护这些碳钢或Cr-Mo钢水冷壁管的首选方法是应用抗硫化的焊接堆焊层。对于某些超临界单元，腐蚀侵蚀可以采取优先渗透的形式，这可能会导致水冷壁管的周向开裂。通常由Cr-Mo钢或奥氏体不锈钢制成的过热器和再热器也依靠堆焊层来提供保护，以防止硫化，侵蚀腐蚀和煤灰腐蚀。众所周知，铬是焊接覆盖层中最重要的合金元素，用于保护锅炉管免受硫化，侵蚀腐蚀和粉煤灰腐蚀。对于当前包括亚临界和超临界单元的锅炉，镍基合金622（ERNiCrMo-10）是使用最广泛的堆焊合金。本文讨论了一种高价铬312型不锈钢，作为一种低成本替代堆焊合金，用于保护燃煤锅炉应用中的锅炉管。

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