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High-Performance Stainless Steel 309/310/310S Buttweld Fittings: Applications, Benefits & Types – Sandvik

At Sandvik, we provide top-tier industrial piping solutions, and among our most in-demand products are Stainless Steel 309/310/310S Buttweld Fittings. These fittings are engineered for extreme environments, where durability, heat resistance, and corrosion resistance are crucial. Designed to ensure seamless connections in high-temperature systems, they offer unmatched reliability for both structural and mechanical applications across various industries.

Stainless Steel 309/310/310S Buttweld Fittings are a category of pipe fittings made from high-alloy stainless steel grades 309, 310, and 310S. These grades are known for their excellent oxidation resistance, superior strength, and stability at elevated temperatures. 309 and 310 are both austenitic stainless steels with high chromium and nickel content, while 310S is a low carbon variant of 310, offering better weldability and reduced carbide precipitation. These fittings are ideal for high-temperature service applications like heat exchangers, boilers, and furnaces.

One of the main advantages of Stainless Steel 309/310/310S Buttweld Fittings is their ability to withstand thermal cycling and oxidation in continuous service up to 1150°C. Their corrosion resistance, especially in mildly oxidizing and nitriding atmospheres, makes them suitable for environments where lesser alloys would fail. The low carbon content in 310S minimizes carbide formation during welding, enhancing resistance to intergranular corrosion. Additionally, these fittings provide a smooth, permanent, and leak-proof connection, ensuring maximum flow efficiency in process pipelines.

Stainless Steel 309/310/310S Buttweld Fittings Manufacturers like Sandvik produce these components to meet global standards such as ASTM A403 and ASME B16.9, ensuring durability and precise dimensions. We offer custom sizes, pressure ratings, and surface finishes tailored to meet specific project needs.

The applications of these fittings are wide-ranging. They are commonly used in petrochemical plants, power generation stations, oil and gas refineries, pulp and paper mills, and thermal processing plants. Their resistance to scaling and high creep strength make them indispensable in furnace parts, kiln linings, heat exchangers, and other equipment exposed to high temperatures and corrosive atmospheres.

Stainless Steel 309/310/310S Buttweld Fittings Suppliers typically offer a variety of fitting types, each designed to serve a specific function in piping systems. Common types include:

Elbows: Used to change the direction of flow, available in 45°, 90°, and 180° angles.

Reducers: Allow smooth flow transition between pipes of different diameters, available as concentric and eccentric reducers.

Tees: Divert or split flow in three directions; available in equal and unequal (reducing) variants.

Caps: Used to seal the end of a pipe permanently or temporarily.

Stub Ends: Used with lap joint flanges for easy dismantling of piping sections.

Stainless Steel 309/310/310S Buttweld Fittings Stockists maintain a wide inventory to ensure fast delivery for urgent requirements. At Sandvik, we prioritize timely dispatch and product traceability to support efficient project execution.

As one of the trusted Stainless Steel 309/310/310S Buttweld Fittings Exporters, Sandvik delivers globally, adhering to international standards and customer specifications. Our rigorous quality checks, in-house testing, and advanced logistics ensure that every fitting we supply performs flawlessly under pressure and heat.

When performance, quality, and reliability matter, Sandvik stands out as the go-to partner for premium stainless steel buttweld fittings. Contact us today to explore how our Stainless Steel 309/310/310S solutions can enhance your next industrial project.

Specification of Stainless Steel 309/310/310S Buttweld Fittings

Standards : ASTM, ASME
Designation : A 403, SA 403
Dimension Standard : ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Grade : Stainless steel 304 Buttweld Pipe Fittings, SS 304 Butt weld
Type : Seamless, Welded
Thickness : Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS
Size : 1/2" to 24"
Two Joint / Two Halve 304 Butt weld Fittings Size : 6" to 48"
Types of Butt weld Fittings : Equal Tee, Nipple, Long Radius Elbow, Reducing Tee, Elbows, Swage Nipple, Short Radius Elbow, Reducer, Barrel Nipple, 90 Deg Elbow, Concentric Reducer, Reducing Nipple, 45 Deg Elbows, Eccentric Reducer, Bend, 180 Deg Elbow, End Cap, 1D Elbow, 3D Elbow, Stubend, 5D Elbow, Cap, Piggable Bend, Long Stubend, Tee, Short Stubend, Long Radius Bend

Equivalent Grades of Stainless Steel 309/310/310S Buttweld Fittings

STANDARD UNS WNR. AFNOR EN JIS BS GOST
SS 309 S30900 1.4833 - - - - -
SS 310 S31000 1.4841 - X2CrNi18-9 / X2CrNi19-11 SUS 310 310S24 20Ch25N20S2
SS 310S S31008 1.4845 - X8CrNi25-21 SUS 310S 310S16 20Ch23N18

Chemical Composition of Stainless Steel 309/310/310S Buttweld Fittings

Element SS 309 SS 310 SS 310S
Ni 14 max 19 – 22 19 – 22
Cr 23 max 24 – 26 24 – 26
C 0.20 max 0.25 max 0.08 max
Fe 60 max Balance
Mn 2 max 2 max 2 max
Si 1 max 1.50 max 1.50 max
S 0.030 max 0.03 max 0.03 max
P 0.045 max 0.045 max 0.045 max

Mechanical Properties of Stainless Steel 309/310/310S Buttweld Fittings

Element SS 309 SS 310 SS 310S
Tensile Strength Psi – 89900 , MPa – 620 Psi – 75000 , MPa – 515 Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset) Psi – 45000 , MPa – 310 Psi – 30000 , MPa – 205 Psi – 30000 , MPa – 205
Elongation 45 % 35 % 35 %