Reducing tee joint is a kind of pipe fittings, and its connection form is to directly butt weld the tee with the steel pipe. Tee joint is a kind of pipe fittings. Its connection form is to directly butt weld the tee and steel pipe. The main manufacturing standards for tee joints are generally GB/T12459, GB/T13401, ASME B16.9, SH3408, SH3409, HG /T21635, HG/T21631, SY/T0510.

The forming of the reducing tee joint is to flatten the tube blank larger than the diameter of the tee to the size of the tee diameter, and open a hole in the stretched branch tube; the tube blank is heated, placed in the forming mold, and placed in the tube. The blank is loaded with a punching die for stretching the branch tube; the tube blank is radially compressed under the action of pressure, and the metal flows in the direction of the branch tube during the radial compression process and forms a branch tube under the stretching of the die.

The whole process of the reducing tee joint is formed by the radial compression of the tube blank and the stretching process of the branch pipe. Different from the hydraulic bulging tee, the metal of the branch pipe of the tee joint is compensated by the radial movement of the tube blank, so it is also called the radial compensation process.

Because the reducing tee joint adopts heating and pressing the tee, the tonnage of equipment required for material forming is reduced. Hot-pressed tee has a wide adaptability to materials, and is suitable for low-carbon steel, alloy steel, and stainless steel; especially for tee with large diameter and thicker wall, this forming process is usually used.

Reducing tee joints are classified into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, pvc, etc. The production methods are divided into topping, pressing, forging, casting, etc.