Seamless steel pipes are single-piece molded steel pipes without welded seams, characterized by uniform strength and excellent pressure resistance and corrosion resistance. They are primarily manufactured by hot rolling methods (such as the Mannesmann process or mandrel mill process, where a heated billet is pierced and elongated) or by the more precise cold drawing method. These manufacturing methods eliminate the risk of leakage or damage from welded parts, resulting in products with extremely high reliability in high-pressure and high-temperature environments. They are widely used as an indispensable material in critical industries requiring high safety and durability, such as oil and gas pipelines, boiler tubes, heat exchangers, hydraulic cylinders, chemical plants, and nuclear power plants.