Hot-pressing forming of tee pipe fittings is to flatten the pipe blank larger than the diameter of tee pipe to the size of the diameter of tee pipe, and open holes at the stretching part of branch pipe; Heating the tube blank, putting the tube blank into a forming mold, and filling the tube blank with the mold to stretch the branch pipe; Under the action of pressure, the tube blank is compressed radially. In the process of radial compression, the metal flows in the direction of the branch pipe, and the branch pipe is formed under the tension of the die. The whole process is formed by radial compression of tube blank and stretching of branch tube. Different from the hydraulic bulging tee, the branch metal of the hot-pressing tee is compensated by the radial movement of the tube blank, so it is also called radial compensation process. Because the tee is pressed after heating, the tonnage of equipment required for material forming is reduced. Hot-pressed tee has wide adaptability to materials and is suitable for low carbon steel, alloy steel and stainless steel materials. Especially for the tee with large pipe diameter and thick pipe wall, the tee can be divided into metal materials and non-metal materials through this molding process. Metal tees include carbon steel, stainless steel and alloy steel. Threaded tee is produced according to the standard of Masteel, and the national standard is GB/ 12459-2005. Non-metallic tee includes PVC, UPVC, PPR, etc. According to the connection mode, it can be divided into two types: snap connection and threaded connection. According to the shape, it can be divided into T-shape and herringbone.

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