Black square pipe is widely used in the construction engineering field. Due to its unique cross-sectional shape, it plays a crucial role in the framework and supporting structures of buildings. It can be used to manufacture various building components such as steel structural columns, beams, crossbeams, and stair railings, providing stable structural support for buildings. Black square tubing is also widely used in the machinery manufacturing industry. Its high strength and pressure resistance make it suitable for manufacturing parts for mechanical equipment. For example, it can be used to manufacture conveyor belt supports, machine tool frames, and automotive parts. Due to its excellent material properties, high toughness, and corrosion resistance, black square steel pipe has a wide range of applications in the machinery manufacturing sector.