Simple structure to facilitate to facilitate maintenance, being appropriate for steam pipelines of high temperature.
结构简单，容易维修保养，适用高温蒸汽管线。
Steel P91 has been used instead of P22 as the material for main steam and high temperature reheat steam pipelines in new built subcritical pressure units.
目前新建的亚临界机组中，主蒸汽管道及再热蒸汽管道热段的材料已用P 91钢代替P 2 2钢。
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