The nuclear power plants under construction and in preparation in China are mainly pressurized water reactor nuclear power plants with very mature technology and safety. In the construction of pressurized water reactor nuclear power plants and the manufacturing of mechanical equipment, the seamless steel pipes used can be divided into four major categories, namely carbon steel/carbon-manganese steel/low alloy steel pipes, chromium-molybdenum steel pipes, stainless steel pipes, and nickel-based alloy pipes. Among them, stainless steel seamless pipes are used in key components such as the main pipelines of the nuclear power plant (coolant), coolant-related primary circuit pipelines, heat transfer tubes of steam generators, and steam drain pipelines.