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Mod 9CrMo (P91) Sub-Arc Wire. Applications Modified 9CrMo steels are now widely used for components such as headers, main steam piping and turbine casings, in fossil-fuelled power-generating plants. They may also find future use in oil refineries and coal liquefaction and gasification plants. Specification AWS A5.23: EB9 BS EN ISO 24598-A: (S CrMo91)