Butt-weld cross is a steel pipe fitting made by hot pressing or forging. The connection method is to directly butt-weld the cross to the steel pipe to ensure the stability and sealing of the connection. Butt-weld crosses are divided into equal diameter and reducing diameter. The pipe ends of equal diameter crosses have the same size, while the pipe ends of reducing crosses have the same size of main pipes, and the branch pipe ends are smaller than the main pipe. Butt-weld crosses are widely used in pipeline branches and are suitable for various industrial fields such as petroleum, natural gas, chemical industry, etc., for connecting four pipes with the same nominal diameter and perpendicular to each other.