SS 347 Tees (Equal & Reducing) - Pipe Fittings

SS 347 Tees are essential pipe forgings used to divide or combine fluid flow in a piping system, creating a **90°** branch from the main line. They come in two primary forms: **Equal Tees** (where the branch has the same diameter as the main run) and **Reducing Tees** (where the branch is smaller). The use of the **SS 347 material**, an austenitic stainless steel stabilized with **Niobium**, is paramount for applications subject to **high heat** and corrosive media. This stabilization effectively eliminates the risk of **intergranular corrosion** in the Heat Affected Zone (HAZ) after welding, making these tees, supplied by Zeron Fasteners, critical for severe service conditions in chemical plants, oil refineries, and high-pressure steam lines where joint integrity under thermal stress is non-negotiable.

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SS 347 Tees Manufacturer in India

SS 347 Tees Chemical Composition

Element Composition (%)
Carbon (C) 0.08 max
Manganese (Mn) 2.00 max
Phosphorus (P) 0.045 max
Sulfur (S) 0.030 max
Silicon (Si) 1.00 max
Chromium (Cr) 17.00 – 19.00
Nickel (Ni) 9.00 – 13.00
Niobium (Nb) + Tantalum (Ta) 10 x C – 1.00

Note: The combined Niobium and Tantalum content must be ten times the Carbon content minimum, up to a maximum of 1.00%.

SS 347 Tees Mechanical Properties

Property Value (Typical, ASTM A403 WP347)
Tensile Strength 515 MPa
Yield Strength (0.2% Offset) 205 MPa
Elongation 30%
Hardness (Brinell, HB) 217 max
Design Temperature Up to 870°C

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