G-TECH 26.50.4W

These electrodes align with similar cast alloys derived from alloy Supertherm (Duraloy), which shares a connection with the cobalt-free alloy 22H (Duraloy). The high carbon high alloy matrix imparts exceptional hot strength and oxidation resistance, particularly at service temperatures ranging from 950-1250°C. The inclusion of cobalt and tungsten becomes crucial for sustaining matrix strength beyond approximately 1150°C, where carbides progressively dissolve. A higher nickel content contributes to the alloy's robust resistance to carburization, while under oxidizing conditions, the elevated chromium content provides valuable resistance to sulfidation. Applications for this alloy encompass highly stressed furnace parts, sintering and calcining muffles, cement kiln components resistant to hot abrasion, radiant tubes, and pyrolysis coils. Due to the alloy's low ductility, combined with the high strength and residual stress levels inherent in multipass welds, preheating is often recommended. For thicker sections, a preheat of 300°C or more may be advisable.