Steel pipe flange connecting structure

The utility model relates to a steel pipe flange connecting structure which comprises a flange, an annular groove is formed in the flange face of the flange, a bolt hole is formed in the flange, and the bolt hole is located in the outer side in the radial direction relative to the annular groove. The rubber mat is of an annular structure and is arranged in the annular groove in a matched mode, and the rubber mat is arranged in the annular groove and forms a protruding part relative to the flange face. The sealing performance of flange connection is improved, meanwhile, the pressing performance of the rubber mat is improved, the connection stability is improved, and deviation of the rubber mat is avoided. 本实用新型涉及一种钢管法兰连接结构，包括：法兰，所述法兰的法兰面上设置环形凹槽，所述法兰上设置螺栓孔，螺栓孔相对于环形凹槽位于沿着径向方向的外侧；胶垫，环形结构，配合置于环形凹槽中，所述胶垫在环形凹槽中，胶垫形成相对于法兰面的凸出部。提高法兰连接的密封性，同时提高胶垫的压紧性，提高连接的稳定性，避免胶垫偏移。