Thermocouples can be used for temperature measurement in high-temperature and ultra-high temperature environments such as steelmaking and metallurgical industries; this dataset includes major raw and auxiliary materials, energy, and waste from the production process, while infrastructure such as production equipment and facility construction is not included within the system boundary of the dataset; the life cycle inventory is compiled from data derived from multiple sources; the manufacturing process of thermocouples includes procedures such as thermoelement wire preparation, thermoelement wire welding, thermoelement protection, in-process inspection, armored protection, instrument housing installation, and final product inspection.