Production Process of Seamless Tees
Raw material re-inspection; cutting and blanking; compression forming; shaping; end finishing; heat treatment; groove processing; finished product inspection; surface treatment; painting and marking; data verification; packaging and delivery

The forming process of tee joints involves flattening a pipe blank with a diameter larger than that of the tee to approximately the tee’s diameter, and drilling a hole at the position where the branch pipe will be stretched. The pipe blank is heated, placed into a forming die, and equipped with a punch for branch pipe stretching inside. Under pressure, the pipe blank undergoes radial compression. During radial compression, the metal flows toward the branch pipe and forms the branch pipe under the stretching action of the punch. The entire forming process is completed through radial compression of the pipe blank and stretching of the branch pipe section. Unlike hydroformed tees, the metal for the branch pipe of tee joints is supplemented by the radial movement of the pipe blank, hence this process is also known as the radial compensation process.

The adoption of hot-pressed tee forming after heating reduces the tonnage requirement of forming equipment. Hot-pressed tees feature wide material adaptability and are applicable to low-carbon steel, alloy steel, stainless steel and other materials. This forming process is commonly used especially for tees with large diameters and thick pipe walls.