Spherical socket type steel pipe assembly

The utility model relates to a spherical socket and spigot type steel pipe assembly, which belongs to the field of pipe fittings and comprises a first pipe fitting and a second pipe fitting, the first pipe fitting and the second pipe fitting both comprise a socket part, a spigot part and a pipe body which are integrally formed, the socket part and the spigot part are arranged at two ends of the pipe body, the socket part and the spigot part are both spherical, and the socket part and the spigot part are both spherical. The axial length of the socket part is smaller than that of the spigot part, and the spigot part of the first pipe fitting and the socket part of the second pipe fitting are connected in a sleeving and inserting mode and are welded and fixed; the wall thickness of the first pipe fitting and the wall thickness of the second pipe fitting are both H, the shortest length of the portion, stretching into the bellmouth part, of the spigot part is D, and D is larger than 2H. According to the spherical