Home > Pipe Fittings > Stainless Steel 309S Pipe Fittings
SS 309S pipe fittings are corrosion–resistant, fabrication–friendly, low–carbon stainless steel fittings intended for applications where resistance to oxidation and thermal stress is crucial. Produced by Chennai-based Vinit Stainless, these fittings are particularly suitable for use in conditions where oxidation and thermal stress are the issues. SS 309S’s low carbon content reduces the risk of welding-induced sensitization and intergranular corrosion. These fittings are extensively applied in high-temperature process pipe, exhaust manifolds, and heat exchangers. Vinit Stainless offers a range of 309S elbows, tees, reducers, and unions with accurate engineering and adherence to global performance and safety standards.
SS 309S pipe fittings consist of 22–24% Chromium, 12–15% Nickel, and ≤0.08% Carbon. The lower carbon content increases weldability and minimizes the risk of precipitation of carbide on welding. These fittings provide a tensile strength of about 515 MPa and yield strength of 205 MPa. SS 309S is utilized in high-temperature conditions up to 980°C with good resistance to oxidation, scaling, and thermal fatigue. The alloy also exhibits mechanical stability and ductility under heat-intensive applications, and it is therefore applicable to intricate fabrication and piping systems within aggressive heat conditions.
| Grades | 201, 202, 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L |
| Type | Seamless / Welded / Fabricated |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Size | ½”NB to 48″NB in |
| Schedule | Sch 10s, 40s, 80s, 160s, XXS. |
| Dimensions | ANSI/ASME B16.9, B16.28, MSS-SP-43. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 309S | 0.10 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18 – 20 | – | 8 – 10.5 | – |
| Density | 8.0 g/cm3 |
| Melting Point | 1400 °C (2550 °F) |
| Tensile Strength | Psi – 75000 , MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 30000 , MPa – 205 |
| Elongation | 35 % |
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Stainless Steel 309S pipe fittings are high-temperature-resistant components known for their exceptional strength and oxidation resistance. Ideal for extreme heat environments, they are used in various industrial and aerospace applications.
SS 309S Butt Weld pipe fittings are high-temperature-resistant components used to join pipes through welding. Made from stainless steel 309S, they offer excellent strength, durability, and resistance to oxidation.
SS 309S Socket Weld pipe fittings are robust components used to connect pipes via a socket weld. Made from stainless steel 309S, they provide excellent heat resistance, strength, and corrosion durability.
Stainless Steel 309S seamless fittings are high-temperature-resistant components without welds, offering superior strength, oxidation resistance, and durability. They are ideal for demanding industrial applications and extreme heat environments.
SS 309S cross pipe fittings are durable components that connect four pipes at a junction. Made from stainless steel 309S, they offer excellent heat resistance, strength, and corrosion durability.
Stainless Steel 309S tee fittings create a T-junction by connecting three pipes. Made from stainless steel 309S, they provide exceptional heat resistance, strength, and corrosion resistance for industrial applications.
SS 309S pipe fittings find extensive use in thermal processing plants, power generation plants, furnace heating systems, and high-temperature ducts. They are ideal for use in applications where there is regular welding and oxidizing atmospheres, such as gas burners, combustion chambers, and superheater tubes. Their resistance to corrosion and heat makes them worth using in chemical plants, refineries, and cement factories. SS 309S fittings also apply to heat exchangers, kilns, and industrial boilers where oxidation and scaling may damage other steel grades. The fittings provide extended service life for applications demanding consistent heat and corrosion performance.
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