MMA electrode for E911 creep-resisting steel with a basic low hydrogen flux system, made on high-purity steel core wire. Electrode is all positional with a moisture-resistant coating giving very low weld metal hydrogen levels. Recovery is about 120% with respect to the core wire, 65% with respect to the whole electrode.
Applications
Electrodes for the new European creep-resistant steel E911, which is essentially the ASTM P91 type with 1%W added to increase creep strength for service up to at least 600°C. These consumables are mainly intended for castings, which have a slightly higher Cr level. Castings also have up to 1%Ni to suppress retained ferrite; in wrought products, nickel is limited to 0.4%. For microstructural control and to optimise toughness after PWHT, the weld metal has about 0.6%Ni added. Applications for E911 steels include components such as headers, main steam piping, boiler tubes, turbine casings and steam valves in fossil-fuelled power generating plants. It may also find future use in oil refineries and coal liquefaction and gasification plants.
Specification
AWS A5.5: E9015-G (E9015-B9 modified)