Stainless Steel 317/317L Buttweld Fittings Manufacturer & Supplier
- Home
- Buttweld Fittings
- SS 317/317L Buttweld Fittings
Midland Alloys is a trusted 317 ss butt weld fittings manufacturer in India, known for producing high-quality solutions that meet ASTM A403 / ASME SA403 specifications. Stainless steel 317 buttweld fittings are made of an austenitic chromium-nickel alloy that includes molybdenum for increased corrosion resistance and tensile strength. SS 317L butt weld fittings is a low-carbon version that is more resistant to sensitization during welding and retains strength even at high temperatures. SS 317 seamless buttweld fittings (½”-10″) and SS 317L welded buttweld fittings (½”-48″) are precision-formed, heat-treated, and tested. We offer all standard types such as equal tee, nipple, long radius elbow, reducing tee, short radius elbow, reducer, barrel nipple, 90° elbow, concentrated reducer, 45° elbow, and more. All fittings are available in custom sizes, schedules, and finishes to meet specific project requirements.
Benefits of ANSI B16.9 317/317L ButtWeld Fittings
- Resists crevice corrosion and pitting in chloride-rich environments.
- Withstands constant stress and high temperatures without losing strength.
- Maintains shape stability during thermal cycling and provides smooth weldability without intergranular corrosion risk.
- Offers greater resistance to sulphuric acid than standard grades.
- Low carbon content in ASTM A403 WP317L butt-weld fittings reduces sensitization.
- Long service life reduces the frequency of replacements.
Specification of SS 317/317L Buttweld Fittings
This section outlines the general specifications of SS 317/317L butt weld fittings, including standards, dimensions, types, and sizes as per ASTM A403.
Seamless Butt Weld Fittings: 1/2" - 10" Welded Butt Weld Fittings: 1/2" - 48"
ASTM A403 / ASME SA403
Forge, Cast, Push, Press, etc.
90 Deg. Elbow, 45 Degree Elbow, LR/SR Elbow, Reducers, Tee, Cross, Bends, U bend, 180 Deg Bend, End Cap, Lap-joint Stub End
ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS4504, BS1560, BS10
Plain End, Beveled End, Treaded
SCH10, SCH20, SCH30, STD SCH40, SCH60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS available with NACE MR 01-75
Seamless / Welded / Fabricated
Types of SS 317/317L Buttweld Fittings
317/317L stainless steel buttweld fittings are components used to connect, redirect, or terminate sections of pipe in industrial systems. These fittings are well known for their exceptional strength and resistance to corrosion making them perfect for demanding applications involving high pressure and severe conditions. It is frequently used in pipelines for chemicals, oil and gas, and ships. They are available in various types and sizes to match different piping layouts, and system designs.
-
Elbow (90°, 45°, Long/Short Radius)Used to change the direction of flow in a pipeline at specified angles; available in short or long radius.
-
Tee (Equal & Reducing)Divides flow into two branches; an equal tee has all ends the same size, a reducing tee has one smaller outlet.
-
Reducer (Concentric & Eccentric)Connects pipes of different diameters; concentric type is symmetrical, eccentric has an offset centerline.
-
Stub End (Short & Long Pattern)Used with lap joint flanges to allow easy dismantling; available in short and long lengths.
-
End CapCloses the end of a pipe to stop flow and protect the system.
-
Cross (Equal & Reducing)Connects four pipes; equal type has all ports the same size, reducing type has different sized outlets.
-
Lateral TeeBranches pipe at a 45° angle for smoother flow direction changes.
-
Pipe BendMakes gradual directional changes in piping with large-radius curves.
-
Return Bends (180°)Turns the flow 180 degrees, commonly used in U-shaped configurations.
-
CollarProvides a flat surface for bolted connections, often used with flanges.
-
NippleShort length of pipe with male threads or beveled ends for close connection between fittings.
-
Barred TeeFeatures a bar across the branch opening to prevent flow into unwanted areas, used in piggable systems.
-
Expansion JointAbsorbs thermal expansion and vibration in piping systems.
-
Swage NippleConnects pipes of different diameters, typically from a larger pipe to a smaller one.
-
Reducer InsertInserted into a fitting to reduce the outlet size without using a separate reducer.
Contact us today to discuss how Stainless Steel 317/317L Buttweld Fittings can benefit your application. Whether you need guidance in selecting the right Buttweld Fittings or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 317 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 – 20.00 | 3.00 – 4.00 | 11.00 – 15.00 | 57.845 min |
| SS 317L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 – 20.00 | 3.00 – 4.00 | 11.00 – 15.00 | 57.89 min |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.9 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 317 | 1.4449 | S31700 | SUS 317 | – |
| SS 317L | 1.4438 | S31703 | SUS 317L | X2CrNiMo18-15-4 |
The pressure ratings of SS 317 and 317L fittings across various schedules and temperature ranges for safe usage.
| NPS (inches) | Schedule | Wall Thickness (mm) | Pressure Rating @100°F (psi) | Pressure Rating @100°F (bar) |
|---|---|---|---|---|
| 2″ | Sch 10S | 2.77 | 450 | 31 |
| 2″ | Sch 40S | 3.91 | 1200 | 82 |
| 2″ | Sch 80S | 5.54 | 1900 | 131 |
| 6″ | Sch 40S | 7.11 | 740 | 51 |
| 6″ | Sch 80S | 10.97 | 1230 | 85 |
Stainless Steel Buttweld Fittings We Offer
ASTM A403 WP317 / 317L Stainless Steel Pipe Fittings
| Products | Size | |
| ASTM A403 WP317 / 317L SS Elbow – Long Radius | ASTM A403 WP317 / 317L SS Stub Ends | Sizes 1/2″ – 48″ |
| ASTM A403 WP317 / 317L SS Elbow – Short Radius | ASTM A403 WP317 / 317L SS Cross | |
| ASTM A403 WP317 / 317L SS Reducing Elbow | ASTM A403 WP317 / 317L SS Reducing Cross | |
| ASTM A403 WP317 / 317L SS 45° Elbow | ASTM A403 WP317 / 317L SS Tees | |
| ASTM A403 WP317 / 317L SS Fabricated Tee | ASTM A403 WP317 / 317L SS End Cap | |
| ASTM A403 WP317 / 317L SS Reducer | ASTM A403 WP317 / 317L SS Coupling | |
| ASTM A403 WP317 / 317L SS Concentric Reducer | ASTM A403 WP317 / 317L SS Pipe Nipple | |
| ASTM A403 WP317 / 317L SS Eccentric Reducer | ASTM A403 WP317 / 317L SS 5D Elbow | |
| ASTM A403 WP317 / 317L SS 3D Elbow | ASTM A403 WP317 / 317L SS Welded Pipe Fittings | |
Stainless Steel 317/317L Buttweld Fittings Dimension
| Nominal Pipe Size | Outside Diameter | 90° Elbows | 45° Elbows | 180° Returns | ||||
| (inches) | Long Radius | Short Radius | Long Radius | Long Radius | ||||
| (mm) | (inches) | Center to Face (inches) | Center to Face (inches) | Center to Face (inches) | Radius (inches) | Center to Center (inches) | Back to face (inches) | |
| 1/2 | 21.3 | 0.840 | 1 1/2 | – | 5/8 | 2 | 1 7/8 | |
| 3/4 | 26.7 | 1.050 | 1 1/8 | – | 7/16 | 2 1/4 | 1 11/16 | |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 | 7/8 | 3 | 2 3/16 | |
| 1 1/4 | 42.2 | 1.660 | 1 7/8 | 1 1/4 | 1 | 3 3/4 | 2 3/4 | |
| 1 1/2 | 48.3 | 1.900 | 2 1/4 | 1 1/2 | 1 1/8 | 3 | 4 1/2 | 3 1/4 |
| 2 | 60.3 | 2.375 | 3 | 2 | 1 3/8 | 4 | 6 | 4 3/16 |
| 2 1/2 | 73.0 | 2.875 | 3 3/4 | 2 1/2 | 1 3/4 | 5 | 7 1/2 | 5 3/16 |
| 3 | 88.9 | 3.500 | 4 1/2 | 3 | 2 | 6 | 9 | 6 1/4 |
| 3 1/2 | 101.6 | 4.000 | 5 1/4 | 3 1/2 | 2 1/4 | 7 | 10 1/2 | 7 1/4 |
| 4 | 114.3 | 4.500 | 6 | 4 | 2 1/2 | 8 | 12 | 8 1/4 |
| 5 | 141.3 | 5.563 | 7 1/2 | 5 | 3 1/8 | 10 | 15 | 10 5/16 |
| 6 | 168.3 | 6.625 | 9 | 6 | 3 3/4 | 12 | 18 | 12 5/16 |
| 8 | 219.1 | 8.625 | 12 | 8 | 5 | 12 | 24 | 16 5/16 |
| 10 | 273.1 | 10.750 | 15 | 10 | 6 1/4 | 15 | 30 | 20 3/8 |
| 12 | 323.9 | 12.750 | 18 | 12 | 7 1/2 | 18 | 36 | 24 3/8 |
Prices above are approximate and subject to change based on raw material costs, pipe form, and market demand.
Stainless Steel 317/317L Buttweld Fittings Weight Chart
| Pipe Elbow Nominal Size | Pipe Elbow Outside Diameter Y |
Wall Thickness T (Pipe Elbow Schedule) |
45 Deg. Elbow LR Centre to Face B | 45 Deg. Elbow LR Weight |
90 Deg. Elbow LR Centre to Face A | 90 Deg. Elbow LR Weight | 90 Deg. Elbow SR Centre to Face A | 90 Deg. Elbow SR Weight | ||
| mm | in | mm | mm | Schedule | mm | kg | mm | kg | mm | kg |
| 15 | 1/2” | 21.3 | 2.78 | STD | 15.9 | 0.04 | 38.1 | 0.08 | – | – |
| 3.73 | X.S | 15.9 | 0.05 | 38.1 | 0.10 | – | – | |||
| 20 | 3/4” | 26.7 | 2.87 | STD | 11.1 | 0.04 | 28.6 | 0.08 | – | – |
| 3.91 | X.S | 11.1 | 0.05 | 28.6 | 0.11 | – | – | |||
| 25 | 1” | 33.4 | 3.38 | STD | 22.2 | 0.09 | 38.1 | 0.15 | 25.4 | 0.11 |
| 4.55 | X.S | 22.2 | 0.11 | 38.1 | 0.19 | 25.4 | 0.14 | |||
| 32 | 11/4” | 42.2 | 3.56 | STD | 25.4 | 0.14 | 47.6 | 0.28 | 31.75 | 0.18 |
| 4.85 | X.S | 25.4 | 0.2 | 47.6 | 0.39 | 31.75 | 0.24 | |||
| 40 | 11/2” | 48.3 | 3.68 | STD | 28.6 | 0.2 | 57.1 | 0.4 | 38.1 | 0.26 |
| 5.08 | X.S | 28.6 | 0.25 | 57.1 | 0.5 | 38.1 | 0.35 | |||
| 50 | 2” | 60.3 | 3.91 | STD | 34.9 | 0.36 | 76.2 | 0.72 | 50.8 | 0.5 |
| 5.54 | X.S | 34.9 | 0.5 | 76.2 | 1.0 | 50.8 | 0.68 | |||
| 65 | 21/2” | 73.0 | 5.16 | STD | 44.4 | 0.73 | 95.2 | 1.46 | 63.5 | 0.95 |
| 7.01 | X.S | 44.4 | 0.91 | 95.2 | 1.82 | 63.5 | 1.27 | |||
| 80 | 3” | 88.9 | 5.49 | STD | 50.8 | 1.1 | 114.3 | 2.18 | 76.2 | 1.45 |
| 7.62 | X.S | 50.8 | 1.45 | 114.3 | 2.86 | 76.2 | 1.95 | |||
| 100 | 4” | 114.3 | 6.02 | STD | 63.5 | 2.1 | 152.4 | 4.2 | 101.6 | 2.8 |
| 8.56 | X.S | 63.5 | 2.9 | 152.4 | 5.7 | 101.6 | 3.9 | |||
| 125 | 5” | 141.3 | 6.65 | STD | 79.4 | 3.4 | 190.0 | 6.8 | 127.0 | 4.8 |
| 9.5 | X.S | 79.4 | 5.0 | 190.0 | 10.0 | 127.0 | 6.5 | |||
| 150 | 6” | 168.3 | 7.11 | STD | 95.2 | 5.1 | 229.0 | 10.1 | 152.4 | 6.8 |
| 10.97 | X.S | 95.2 | 7.7 | 229.0 | 15.3 | 152.4 | 10.2 | |||
| 200 | 8” | 219.1 | 8.18 | STD | 127.0 | 10.2 | 305.0 | 20.4 | 203.0 | 13.6 |
| 12.7 | X.S | 127.0 | 15.5 | 305.0 | 30.9 | 203.0 | 20.9 | |||
| 250 | 10” | 273.9 | 9.27 | STD | 159.0 | 18.1 | 381.0 | 36.1 | 254.0 | 24.1 |
| 12.7 | X.S | 159.0 | 24.4 | 381.0 | 48.8 | 254.0 | 32.5 | |||
| 300 | 12” | 323.9 | 9.52 | STD | 190.0 | 26.6 | 457.0 | 53.1 | 305.0 | 35.4 |
| 12.7 | X.S | 190.0 | 35.0 | 457.0 | 70.0 | 305.0 | 46.7 | |||
| 350 | 14” | 355.6 | 9.52 | STD | 222.0 | 34.1 | 533.0 | 68.1 | 356.0 | 45.4 |
| 12.7 | X.S | 222.0 | 45.0 | 533.0 | 90.0 | 356.0 | 60.0 | |||
| 400 | 16” | 406.4 | 9.52 | STD | 254.0 | 45.0 | 610.0 | 89.3 | 406.0 | 59.5 |
| 12.7 | X.S | 254.0 | 59.0 | 610.0 | 118.0 | 406.0 | 78.7 | |||
| 450 | 18” | 457.0 | 9.52 | STD | 286.0 | 56.5 | 686.0 | 113.0 | 457.0 | 75.6 |
| 12.7 | X.S | 286.0 | 75.0 | 686.0 | 150.0 | 457.0 | 100.0 | |||
| 500 | 20” | 508.0 | 9.52 | STD | 318.0 | 85.0 | 762.0 | 140.0 | 508.0 | 93.5 |
| 12.7 | X.S | 318.0 | 112.5 | 762.0 | 186.0 | 508.0 | 124.0 | |||
| 600 | 24” | 610.00 | 9.52 | STD | 381.0 | 101.5 | 914.0 | 203.0 | 610.0 | 135.0 |
| 12.7 | X.S | 381.0 | 134.5 | 914.0 | 269.0 | 610.0 | 179.0 | |||
SS 317/317L vs SS 316/316L Buttweld Fittings: Key Differences
Stainless Steel 317 and 317L Buttweld Fittings contain more molybdenum than stainless steel 316 buttweld fittings, giving them stronger resistance to pitting and crevice corrosion in harsh environments. Stainless Steel 317L Buttweld Fittings have a lower carbon content, which prevents carbide precipitation during welding, making them ideal for as-welded applications. SS 317 and 317L also offer higher tensile strength and stress-rupture resistance at elevated temperatures compared to 316/316L. This makes them suitable for demanding chemical and marine services.
Manufacturing Process of SS 317/317L Buttweld Fittings
The process starts with choosing certified SS 317/317L Buttweld Fittings that meet strict quality standard. Depending on the type of fitting, we precisely cut the raw material. After that, heat or cold forming techniques are used to mold the parts into reducers, tees, elbows, and other shapes. After shaping, we apply solution annealing to improve the grain structure, and remove internal stress. Surface finishing follows, using pickling, passivation, or blasting for a clean, corrosion-resistant surface. Each fitting goes through final inspection and non-destructive testing to confirm quality and performance.
Pipe
Cutting
Forming
Sizing
Heat Treatment
Pickling
Beveling
Polishing
Sand Blasting
Elbow
Inspection
Analytic
Marking
Packing & Shipping
Stainless Steel 317/317L Buttweld Fittings Applications
ANSI B16.9 317 buttweld fittings are widely used where strength and reliability matter. Stainless 317 90° LR elbow buttweld fittings connect piping systems in chemical plants, handling aggressive media like sulphuric and acetic acids. 317 ss buttweld fittings for chemical processing ensure safe flow under pressure, whereas SS 317L buttweld fittings for oil and gas are used in offshore rigs, refineries, and transportation pipelines. They are also used in food and beverage, power generation, marine systems, and pharmaceutical plants to provide clean and long-lasting piping solutions.
We ship buttweld fittings made of 317/317L stainless steel to clients worldwide. We frequently export to Gulf nations having high demand for oil and gas as well as construction, such as the United Arab Emirates, Saudi Arabia, Oman, Qatar, and Kuwait. Our presence is also growing fast in Europe, with steady orders from Germany, the UK, France and Italy. In the Asia-Pacific region, we supply fittings to Singapore, Malaysia, Indonesia, and South Korea. We also reach emerging markets in Africa and Latin America, including South Africa, Egypt, Nigeria, and Brazil. Every export meets customs requirements, with secure packaging, proper port handling, and timely delivery. Over the years, we’ve built trusted relationships with project contractors, OEMs, local distributors, and government buyers who trust us for reliable supply and service.
Why Choose Midland Alloys Inc. for ASTM A403 WP 317/317L Buttweld Fittings?
Midland Alloys Inc., a trusted SS 317L butt weld fittings supplier in Mumbai, known for consistent quality and timely delivery. All fittings are certified to international standards such as ISO 9001:2015, PED 2014/68/EU, and EN 10204 3.1/3.2 Mill Test Certificates, and TÜV, BV, SGS, and DNV provide support for TPI inspections. We collaborate with engineering firms, EPC contractors, marine operators, and chemical plants worldwide. Hydrostatic, ultrasonic, radiographic and PMI tests are performed on each fitting, as well as mechanical tests such as tensile, hardness, and bend testing as needed. Our team guarantees complete export documentation and timely delivery. Repeat customers from the Middle East, Europe, and Southeast Asia trust us for our MSS SP-43 317 fittings and their quality.
FAQs –SS 317/317L Buttweld Fitting
Available in schedules 5S, 10S, 40S, and 160S, these pipes range from ½″ to 48″ NB and meet standard ANSI B16.9 pressure ratings.
No. These fittings are easily welded without intergranular corrosion risk.
The fitting size, schedule, and grade should be appropriate for your system’s pressure, temperature, and fluid compatibility.
Prices vary by size, schedule, and order volume. Contact us for current competitive rates.
