Because of the large equipment needed in the hydraulic expansion process of tee, the manufacture of tee with Standard Wall thickness less than DN400 is the main market. The forming materials suitable for this process are low alloy steel, stainless steel and low carbon steel with low degree of cold work hardening, and some Non-ferrous metal such as aluminum and titanium The three-way hot-pressing process is mainly to flatten the larger three-way diameter tube embryo, press it to the size of the three-way diameter, and open a hole at the part of the stretch branch tube, at the same time, the die of drawing branch pipe was installed in the tube embryo, and the tube embryo was compressed radially under the pressure, at the same time, the metal in the tube embryo flowed in the direction of the branch pipe, and finally the branch pipe was formed under the drawing of the die.

The whole forming process is realized by the radial compression of the tube embryo and the stretching of the branch tube. Compared with the hydraulic expansion tee, the hot-pressing tee tube metal is realized by the radial movement of the Tube Germs. So we call this process radial compensation process. Because the tube embryo after heating will restrict the three-way, so in the material forming process to reduce the required tonnage. The practical hot-press tee is wide and suitable for alloy steel and stainless steel, especially for the tee with large diameter and thick pipe wall.

The hydraulic expansion forming process of tee is a forming process by means of axial compensation of metal material. This process must use a special hydraulic press to inject liquid into the tube germs with the same diameter as tee, two horizontal side cylinders were extruded synchronously by a hydraulic press. When the tube embryo was subjected to a certain pressure, the volume of the whole tube embryo became smaller, the pressure is building up. Once the necessary pressure is reached for the branch to expand, the metal material inside will expand the branch tube under the liquid pressure in the tube embryo and the liquid pressure in the side cylinder. Because of the particularity of the process, it is widely used in many industries.