Nozzles can be used for guiding molten steel flow from tundish to mold in steel plants, preventing molten steel oxidation and splashing; this dataset includes main raw and auxiliary materials, energy inputs, atmospheric emissions, and waste generated during production, but infrastructure such as production equipment and facility construction are excluded from the system boundary; the life cycle inventory is compiled from data sourced from multiple origins; the manufacturing process of nozzles includes raw material procurement, forming, sintering and curing, precision machining, surface treatment, inspection, packaging, and other processes.