Carbon steel tees are commonly used for installation in regulating valves, utilizing drainage. Concentric reducers are beneficial for fluid flow, causing minimal disturbance to the fluid's flow pattern during diameter changes.

The Seamless Tee is used for changing the diameter of concentric reducing pipes in gas and vertical liquid pipelines. Eccentric reducing pipes, with one side flat, are advantageous for venting or draining, facilitating operation and maintenance. Therefore, liquid pipelines installed horizontally typically use eccentric reducing pipes.

Reduced Tee pipes, also known as elbows, are used for connecting pipes or flanges of different diameters to change the pipe size. The concentric reduced tee has ends with pipe openings on the same axis, so the position of the pipe remains unchanged when sizing, typically used for gas or vertical liquid pipelines. The eccentric reduced tee has ends with the circumferences of the openings tangent to each other, generally used for horizontal liquid pipelines.

The Welded Three-Way Elbow is a bend that is either steel hot-pressed or forged. Its connection method involves directly welding the elbow to the steel pipe. The primary manufacturing standards for Welded Three-Way Elbows are generally GB/T12459, GB/T13401, ASME B16.9, SH3408, SH3409, HG/T21635, HG/T21631, and SY/T0510.

Welded tees generally include equal-diameter tees and unequal-diameter tees, with materials available in carbon steel, alloy steel, and stainless steel.

Carbon steel tees exhibit a protective layer of oxidation (self-passivating film) on the surface when the chromium content reaches approximately 1.2%, as the chromium reacts with oxygen in the corrosive medium. This seamless tee prevents further corrosion of the steel matrix. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, and nitrogen, to meet the requirements of various applications for the structure and properties of concentric reducing tees. The production of full-bore tees utilizes specific manufacturing and processing techniques to ensure their effectiveness and performance throughout the production and processing stages.