Rod nickel alloy VDM® C-263

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VDM® Alloy C-263 is a high-temperature precipitation-hardening creep-resisting nickel-chromium-cobalt-molybdenum alloy developed by Rolls-Royce. It is ususally supplied in the high-temperature annealed condition and is recommended for service temperatures up to 850 °C (1,560 °F). VDM® Alloy C-263 is characterized by:  Excellent resistance to oxidation and scaling up to 1,000 °C (1,800 °F)  Good mechanical properties and excellent creep values at elevated temperatures  Good weldability without susceptibility to post-weld heat treatment cracking  Improved wear characteristics The high-temperature strength of VDM® Alloy C-263 is obtained by two strengthening mechanismus. The cobalt and molybdenum additions give solid-solution strengthening. The aluminum and titanium additions form precipitates of the γ’phases Ni3 (Al, Ti) on age-hardening. The cobalt addition also increases the solubility of γ’ above 1100 °C (2010 °F), thus facilitating hot working despite the high aluminium and titanium contents. Boron and zirconium also improve creep rupture properties. In the fully heat-treated condition, the microstructure of of VDM® Alloy C-263 shows fine discontinuous precipitates of carbides (M23C6) at the grain boundaries. Continuous M23C6 films must be avoided, as this can lead to poor ductility and hot trearing during welding. Correct solution treatment will avoid this effect. The following mechanical properties apply to VDM® Alloy C-263 in the indicated size ranges (see availability). Specified properties of material outside these size ranges are subject to special enquiry.