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: P ≤ 9 where P = (7C + 5Si + 8Nb – 3Mn). These alloys are used for their resistance to corrosion, thermal fatigue and shock at temperatures up to about 1000°C, for the fabrication of **muffles and radiant tubes, heat treatment trays and baskets, reformer furnace outlet manifolds and ethylene plant transfer lines, in the furnace, petrochemical and nuclear engineering industries**. These consumables are used as alternatives to various nickel base consumables up to 1000°C, with the added benefit of expansion coefficient and sulphidation resistance similar to parent material.