ASTM A182 S316L Tee

ASTM A182 S316L Tee refers to a pipe branch connector made of S316L ultra-low carbon austenitic stainless steel forged or extruded. Its core function is to achieve fluid diversion (splitting one fluid into two) or merging (merging two fluids into one) in the pipeline system, while ensuring the sealing performance and structural strength of the branch connection.

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S316L Tee Material Association Characteristics

The chemical composition of S316L Tee meets international standards, with core components ranging from 16.00% -18.00% chromium (Cr), 10.00% -14.00% nickel (Ni), 2.00% -3.00% molybdenum (Mo), carbon (C) ≤ 0.03%, manganese (Mn) ≤ 2.00%, silicon (Si) ≤ 0.75%, phosphorus (P) ≤ 0.045%, and sulfur (S) ≤ 0.030%.

S316L Tee core performance

Fluid stability: The flow channel design of Tee adopts a smooth transition (the angle between the branch pipe and the main pipe is usually 45 ° or 90 °), with a low fluid resistance coefficient (the local resistance coefficient of 90 ° Tee is about 1.5-2.0), which can reduce pressure loss during diversion/merging, and is suitable for pipeline systems that require stable flow. ​

Corrosion resistance: Resistance to chloride ions, organic acids (such as acetic acid), inorganic acids (such as dilute sulfuric acid), and alkaline media. The pitting potential in a 3.5% sodium chloride solution (at room temperature) is ≥ 1000mV, much higher than S304 Tee (about 800mV), suitable for corrosive environments such as coastal areas and chemical industries. ​

Temperature and pressure adaptability: The continuous use temperature range is -270 ℃ -450 ℃. Under the pressure level of PN16-PN40, it can withstand the medium pressure of the pipeline system for a long time. The wall thickness design at the connection between the main and branch pipes (usually 10% -15% thicker than the same specification of straight pipes) ensures no structural deformation.

Welding performance: It can be connected to pipelines through argon arc welding (GTAW) and electric arc welding (SMAW). The tensile strength of the welded joint is ≥ 515 MPa, which matches the properties of the base material. Cracks are not easily generated at branch welds.

Main Structural Types of S316L Tee

S316L material Standards

Standards ensure compatibility and safety. ASTM A182 covers forged 316L fittings, while ASME SA182 is its equivalent. For seamless pipes and fittings, ASTM A312 and ASME SA312 apply. European equivalents include EN 10088 for X2CrNiMo17-12-2, and German DIN 1.4404. 

uns s31603 tee Typical Applications

Chemical and Petrochemical: Acetic, sulfuric, and phosphoric acid plants, cracked gas quenching systems in ethylene plants and organic synthesis processes containing chlorides.

Marine Engineering and Seawater Desalination: Seawater cooling piping systems, preheaters, pumps, and piping in seawater desalination plants and high-pressure seawater systems on ships.

Flue Gas Desulfurization (FGD) Systems: Wet areas most susceptible to corrosion, such as the absorber spray layer, demister, and outlet flue.

Paper Industry: Equipment and piping in the pulp bleaching process (ClO₂ environment).

Pharmaceutical and Food Industries: Demanding process steps requiring extreme cleanliness and corrosion resistance.

Environmental Protection: Wastewater treatment, particularly for industrial wastewater containing high levels of chlorides, sulfides, or acidic components.

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