Metrode Ultramet-800NB description: The consumables are designed to deposit weld metal with composition and properties closely matching type 800 alloys in cast and wrought forms. The weld metals are based on the composition of castings, with controlled carbon and niobium for optimum corrosion resistance and creep performance. Most wrought materials have Ti and Al instead of Nb. Weld metal Mn and Si levels are modified to give high resistance to hot cracking in highly restrained welds. For optimum resistance to ageing embrittlement, the composition will generally meet the Chiyoda parameter: P9 where P = (7C + 5Si + 8Nb – 3Mn).