Forming Technologies: Equidiameter tee convex formation technology:

Hot pressing molding: The tube blank larger than the three-way diameter is flattened to a size of about the three-way diameter, then the tube blank is heated and placed into the molding mold, and the filling mold of the stretch branch pipe is loaded into the tube blank. Under pressure, the tube blank is radially compressed, the metal flows in the direction of the branch pipe, and the branch pipe is formed under the stretching of the mold filling. This process is also called the radial compensation process.

Cold drawing molding: Open holes at the part where the pipe blank stretches the branch pipe, then put the pipe blank into the molding mold, and stretch the branch pipe part through external force to make the metal flow to form the branch pipe. Unlike hot pressing, cold drawing molding usually does not require heating of the tube blank, and is suitable for the production of some temperature-sensitive materials or small-size tees. However, for large-size or thick-walled tube blanks, cold drawing molding may face challenges due to the difficulty of metal deformation.

Welding forming: First cut the pipe into a suitable shape and size, usually including the main pipe and two branch pipe parts. The parts are then connected together by welding process to form an equal diameter tee. When welding, we must ensure the welding quality to avoid defects such as fake welding, false welding, and bubbles. After welding is completed, the weld may need to be polished, polished, etc. to improve the surface quality and appearance effect.

Hot extrusion: For steel seamless thick wall equal diameter tees, hot extrusion process can be used. Heat the steel pipe to be molded to a specified temperature (such as 1000℃), put PVC plastic pipe filled with wet soil in the inner cavity of the steel pipe, then put the steel pipe into the molding mold, start the three-way extruder to apply extrusion pressure at both ends of the steel pipe, and at the same time, the extruder press seals both ends of the steel pipe. The PVC plastic pipe burns when heated and generates gas, forming an internal high pressure in the inner cavity of the steel pipe, thereby extruding the three-way branch pipe. This process is suitable for tee forming of carbon steel, alloy steel, stainless steel and other materials with wall thickness and outer diameter ratio greater than 0.2.

Comprehensive Size Ranges

Specifications for seamless equal diameter tees DN15 to DN600 are usually the same as the outer diameter of the seamless steel pipe of the corresponding nominal diameter:

DN15: Outer diameter 22mm.
DN20: Outer diameter 27mm.
DN25: Outer diameter 34mm.
DN32: Outer diameter 42mm.
DN40: Outer diameter 48mm.
DN50: Outer diameter 60mm.
DN65: Outer diameter 76mm (partially 73mm too).
DN80: Outer diameter 89mm.
DN100: Outer diameter 114mm.
DN125: Outer diameter 140mm.
DN150: Outer diameter 168mm.
DN200: Outer diameter 219mm.
DN250: Outer diameter 273mm.
DN300: Outer diameter 324mm.
DN350: Outer diameter 360mm.
DN400: Outer diameter 406mm.
DN450: Outer diameter 457mm.
DN500: Outer diameter 508mm.
DN600: Outer diameter 610mm.

The specifications of welding equal diameter tee DN15 to DN1200 can be found in accordance with the standard GB/T12459-2017, customized. The following are the dimension information of some specifications under the B series and wall thickness grade STD:

Nominal diameter DN	Outer diameter (mm)	Center to end face dimensions C (mm)
DN15	18	25
DN20	25	29
DN25	32	38
DN32	38	48
DN40	45	57
DN50	57	64
DN65	76	76
DN80	89	86
DN100	108	105
DN125	133	124
DN150	159	143
DN200	219	178
DN250	273	216
DN300	325	254
DN350	377	279
DN400	426	305
DN450	478	343
DN500	529	381
DN600	630	419
DN700	720	495
DN800	820	559
DN900	920	635
DN1000	1020	673
DN1200	1220	889