G-TECH 800Nb

The consumables from this subfamily are designed to deposit weld metal with chemical and mechanical properties closely aligned with 800-type alloys, both in cast and wrought forms. The weld metal composition is engineered to reflect that of the castings, with strict control of carbon and niobium to optimize corrosion resistance and creep performance. In contrast, most wrought materials use titanium and aluminum instead of niobium. The manganese and silicon levels in the filler metal have been optimized to ensure high resistance to hot cracking in highly restrained welds. To minimize aging embrittlement, the composition is generally designed to meet Chiyoda’s parameter: P ≤ 9 with P = (7C + 5Si + 8Nb – 3Mn). These alloys are applied in contexts where corrosion resistance, thermal fatigue, and thermal shock resistance are required at temperatures that can reach approximately 1000 °C. They are ideal for the fabrication of muffles and radiant tubes, trays and baskets for heat treatment, outlet headers in reforming furnaces, and transfer lines in ethylene plants, particularly in fields like the petrochemical industry and nuclear engineering. These consumables are an excellent alternative to nickel-based materials up to temperatures of 1000 °C, also offering a comparable expansion coefficient and resistance to sulphidation as that of the base material.