Stainless Steel 347/347H Buttweld Fittings Manufacturer & Supplier
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Stainless Steel 347/347H Buttweld Fittings are high-strength, corrosion-resistant components that provide secure and leak-free pipe connections. Midland Alloys is a leading ss 347 butt weld fitting supplier in India, offering fittings that meet ASTM A403 / ASME SA403 specifications. SS 347 Buttweld Fittings are niobium stabilized, providing excellent intergranular corrosion resistance, whereas Stainless Steel 347H Buttweld Fittings have a higher carbon content, resulting in improved creep strength and performance at high temperatures.
Our fittings are made using seamless or welded processes, resulting in precise dimensions and long-lasting weld joints. Types available include elbows, tees, reducers, stub ends, and caps, as well as ss 347 equal & reducing tees buttweld and ss 347H 45° elbows buttweld. We offer stainless 347 buttweld fittings ½″–48 size range with custom forms, dimension, and types option to meet specific project needs.
Benefits of ANSI B16.9 347 Buttweld Fittings
- Maintains strength in continuous high-temperature operations.
- Resists intergranular corrosion caused by carbide precipitation.
- Withstands thermal cycling without cracking or distortion.
- Provides extended service life with minimal maintenance.
- Maintains toughness under oxidizing and reducing conditions.
- ASME SA403 WP347/347H fittings are easy to weld and suitable for on-site fabrication.
Specification of SS 347/347H Buttweld Fittings
This section outlines the general specifications of SS 347/347H 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 347/347H Buttweld Fittings
347/347H 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.
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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.
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Tee (Equal & Reducing)Divides flow into two branches; an equal tee has all ends the same size, a reducing tee has one smaller outlet.
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Reducer (Concentric & Eccentric)Connects pipes of different diameters; concentric type is symmetrical, eccentric has an offset centerline.
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Stub End (Short & Long Pattern)Used with lap joint flanges to allow easy dismantling; available in short and long lengths.
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End CapCloses the end of a pipe to stop flow and protect the system.
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Cross (Equal & Reducing)Connects four pipes; equal type has all ports the same size, reducing type has different sized outlets.
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Lateral TeeBranches pipe at a 45° angle for smoother flow direction changes.
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Pipe BendMakes gradual directional changes in piping with large-radius curves.
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Return Bends (180°)Turns the flow 180 degrees, commonly used in U-shaped configurations.
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CollarProvides a flat surface for bolted connections, often used with flanges.
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NippleShort length of pipe with male threads or beveled ends for close connection between fittings.
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Barred TeeFeatures a bar across the branch opening to prevent flow into unwanted areas, used in piggable systems.
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Expansion JointAbsorbs thermal expansion and vibration in piping systems.
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Swage NippleConnects pipes of different diameters, typically from a larger pipe to a smaller one.
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Reducer InsertInserted into a fitting to reduce the outlet size without using a separate reducer.
Contact us today to discuss how Stainless Steel 347/347H 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 | Cb | Ni | Fe |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 20.00 | 10xC – 1.10 | 9.00 – 13.00 | 62.74 min |
| SS 347H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 8xC – 1.10 | 9.0 -13.0 | 63.72 min |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | X6CrNiTi18-10 |
| SS 347H | 1.4961 | S34709 | SUS 347H | X12CrNiTi18-9 |
| Temperature (°C) | Pressure Rating (MPa) | Pressure Rating (psi) |
|---|---|---|
| -29 to 38 | 20.0 | 2900 |
| 100 | 17.6 | 2550 |
| 200 | 15.5 | 2250 |
| 300 | 13.5 | 1960 |
| 400 | 12.0 | 1740 |
| 500 | 10.5 | 1520 |
| 600 | 9.0 | 1310 |
Stainless Steel Buttweld Fittings We Offer
ASTM A403 WP347 / 347H Stainless Steel Pipe Fittings
| Products | Size | |
| ASTM A403 WP347 / 347H SS Elbow – Long Radius | ASTM A403 WP347 / 347H SS Stub Ends | Sizes 1/2″ – 48″ |
| ASTM A403 WP347 / 347H SS Elbow – Short Radius | ASTM A403 WP347 / 347H SS Cross | |
| ASTM A403 WP347 / 347H SS Reducing Elbow | ASTM A403 WP347 / 347H SS Reducing Cross | |
| ASTM A403 WP347 / 347H SS 45° Elbow | ASTM A403 WP347 / 347H SS Tees | |
| ASTM A403 WP347 / 347H SS Fabricated Tee | ASTM A403 WP347 / 347H SS End Cap | |
| ASTM A403 WP347 / 347H SS Reducer | ASTM A403 WP347 / 347H SS Coupling | |
| ASTM A403 WP347 / 347H SS Concentric Reducer | ASTM A403 WP347 / 347H SS Pipe Nipple | |
| ASTM A403 WP347 / 347H SS Eccentric Reducer | ASTM A403 WP347 / 347H SS 5D Elbow | |
| ASTM A403 WP347 / 347H SS 3D Elbow | ASTM A403 WP347 / 347H SS Welded Pipe Fittings | |
Stainless Steel 347/347H 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 |
Stainless Steel 347/347H 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 | |||
Prices above are approximate and subject to change based on raw material costs, pipe form, and market demand.
SS 347/347H vs SS 317/317L Buttweld Fittings: Key Differences
Stainless Steel 347H Buttweld Fittings excel in high-temperature and oxidation-resistant applications, due to niobium stabilization and higher creep strength in 347H. In comparison, Stainless Steel 317/ 317L Buttweld Fittings provide better resistance to chlorides and acid attacks due to their higher molybdenum content. Choose 347/347H for elevated temperature service, and stainless steel 317L buttweld fittings for superior corrosion performance in chemical environments.
Manufacturing Process of SS 347/347H Buttweld Fittings
The process starts with choosing certified SS 347/347H 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 347/347H Buttweld Fittings Applications
347 butt weld fittings for petrochemical systems are used in pipelines that transport hot, corrosive fluids. 347H butt weld fittings for oil and gas ensure durability in refineries, offshore rigs, and gas processing plants. 34H buttweld fittings for power plants control steam lines and high-temperature boiler systems. These DIN 1.4550 butt weld fittings, used in chemical production, pulp and paper, heat exchangers, and food-processing pipelines, ensure strong, long-lasting joints.
We ship buttweld fittings made of 347/347H 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 ASME SA403 WP347/347H Buttweld Fittings
Midland Alloys Inc., a trusted 347H butt weld fittings manufacturer, known for quality and reliability. We hold ISO 9001:2015, PED 2014/68/EU, and EN 10204 3.1/3.2 certifications, and support TPI inspections from TÜV, BV, SGS, and DNV. We supply these fittings to engineering firms, EPC contractors, marine operators, and chemical plants, with a reputation for on-time delivery and expert export documentation.
Each UNS S34700 buttweld fitting go through in-house and third-party tests, including hydrostatic, ultrasonic, radiographic, and PMI checks, as well as tensile, hardness, flattening, and bend tests per client needs. Our stainless steel 347H butt weld fittings and ss seamless 347 buttweld fittings are durable and preferred from clients in the Middle East, Europe, and Southeast Asia.
FAQs –SS 347/347H Buttweld Fitting
347H has higher carbon content, giving it better creep strength for high-temperature use.
Yes. They can be welded to most stainless steels with proper filler metals and techniques.
Elbows, tees, reducers, caps, stub ends, and customized stainless welded 347 buttweld fittings are available.
No. These grades are stabilized and usually don’t need post-weld heat treatment.
