Abstract: The remanufacturing of ultra-large backup rolls constitutes a key link in ensuring the security and economic efficiency of the medium-to-heavy plate rolling industry. Within this process, annealing heat treatment serves as the core step that directly dictates the final performance of the repaired layer. To address prevalent issues such as unstable performance and short service life of the repaired layer in current remanufacturing practices, this study fabricated Cr5 steel repaired layer samples via submerged arc surfacing. A systematic investigation was conducted on the effects of different annealing temperatures(as-deposited, 450 ℃, 650 ℃) on the tensile properties, fracture morphology, and hardness of the layer. The results demonstrate a significant influence of annealing temperature. The as-deposited sample exhibited the highest tensile strength. With increasing temperature, the strength decreased while the elongation improved. Fractography indicated enhanced plasticity with higher annealing temperatures, with the fracture mechanism remaining ductile across all conditions. This work provides valuable experimental evidence and insights for establishing remanufacturing process specifications targeting ultra-large backup rolls with high reliability and prolonged service life.