SMO 254 Buttweld Fittings Manufacturer & Supplier
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Midland Alloys Inc. is a trusted Indian manufacturer and global supplier of stainless steel buttweld fittings known for quality, reliability, and compliance. Because of their sophisticated austenitic stainless steel composition SMO 254 buttweld fittings stand out among our premium offerings. Developed with nearly double the strength of the 300-series stainless steels, UNS S31254 fittings offer remarkable resistance to chloride stress corrosion cracking, pitting, crevice corrosion, and impact loads.
Their superior anti-biofouling behaviour makes them highly effective in seawater systems, and they are often considered a cost-effective alternative to high-nickel and titanium alloys. Suitable for a range of industrial-grade piping solutions, 254 SMO buttweld fittings are available in seamless, welded, and fabricated varieties and are renowned for their exceptional workability and high durability.
Benefits of UNS S31254 Buttweld Fittings
- Excellent machinability for precise fabrication and clean assembly.
- Superior weldability enabling strong and durable joint formations.
- Effective annealing properties after cold working or forming.
- Performs reliably in extreme environments including high chloride exposure.
- Functions well under low temperature service conditions without brittleness.
- Enables high mechanical strength without compromising ductility.
- Offers stress corrosion cracking resistance in saltwater and acidic conditions.
- Provides high resistance to pitting and crevice corrosion.
Specification of SMO 254 Buttweld Fittings
This section outlines the general specifications of SMO 254 buttweld 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 SMO 254 Buttweld Fittings
SMO 254 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.
- Reducer Insert
Inserted into a fitting to reduce the outlet size without using a separate reducer.
Technical Details & Delivery Condition
| SMO 254 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| 17.5 – 18.5 |
0.02 max | 6 – 6.5 |
1 max | 0.8 max | – | 0.5 – 1 | 0.01 max | 0.03 max | 19.5 – 20.5 |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SMO 254 | 8.0 g/cm3 | 1320-1390 ℃ | 650 | 300 | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | SIS | GOST | AFNOR | EN |
| SMO 254 | 1.4547 | S31254 | – | 2378 | – | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 |
| Nominal Pipe Size (NPS) | Class | Allowable Pressure (psi) |
|---|---|---|
| ½″ to 10″ | 150 | 740 |
| ½″ to 10″ | 300 | 1480 |
| ½″ to 10″ | 600 | 2960 |
| ½″ to 10″ | 900 | 4440 |
| ½″ to 10″ | 1500 | 7400 |
Stainless Steel Buttweld Fittings We Offer
ASTM A403 SMO 254 Pipe Fittings
| Products | Size | |
| ASTM A403 SMO 254 Elbow – Long Radius | ASTM A403 SMO 254 Stub Ends | Sizes 1/2″ – 24″ |
| ASTM A403 SMO 254 Elbow – Short Radius | ASTM A403 SMO 254 Cross | |
| ASTM A403 SMO 254 Reducing Elbow | ASTM A403 SMO 254 Reducing Cross | |
| ASTM A403 SMO 254 45° Elbow | ASTM A403 SMO 254 Tees | |
| ASTM A403 SMO 254 Fabricated Tee | ASTM A403 SMO 254 End Cap | |
| ASTM A403 SMO 254 Reducer | ASTM A403 SMO 254 Seamless Fittings | |
| ASTM A403 SMO 254 Concentric Reducer | ASTM A403 SMO 254 Pipe Nipple | |
| ASTM A403 SMO 254 Eccentric Reducer | ASTM A403 SMO 254 5D Elbow | |
| ASTM A403 SMO 254 3D Elbow | ASTM A403 SMO 254 Welded Pipe Fittings | |
SMO 254 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.
SMO 254 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.
Difference Between UNS S31254 Buttweld Fittings and Stainless Steel 253MA Buttweld Fittings
While both UNS S31254 (SMO 254) and Stainless Steel 253MA are high performance austenitic alloys their chemical and mechanical compositions vary significantly. SMO 254 has a higher molybdenum (6–6.5%) and nitrogen (up to 0.22%) content, which improves its resistance to pitting and crevice corrosion, particularly in high-chloride and marine environments. On the other hand, 253MA is better suited for high-temperature structural applications due to its improved oxidation and creep resistance. SMO 254 fittings perform exceptionally well in harsh chemical environments and seawater corrosion resistance such as offshore or desalination plants even though 253MA offers strong performance at high temperatures.
Manufacturing Process of SMO 254 Buttweld Fittings
The process starts with choosing certified SMO 254 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
Applications of Stainless Steel SMO 254 Buttweld Fittings
SS SMO 254 buttweld fittings are engineered for demanding industrial environments, particularly where resistance to corrosion and structural integrity is paramount. Their resistance to biofouling guarantees a longer service life in saltwater handling system. Their exceptional mechanical and corrosion resistance is advantageous for parts used in petroleum production, flue gas desulfurization scrubbers and tall oil distillation columns. Under corrosive processing conditions, they retain their integrity in the food and chemical processing industries. Applications include heat exchangers, desalination facilities, pulp and paper bleaching system and flue gas cleaning where chemical resistance and thermal performance are crucial.
We ship buttweld fittings made of SMO 254 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 Us for ASTM A403 WPS S31254 Buttweld Fittings
One of the leading producers and suppliers of high-quality SMO 254 buttweld fittings in India The ASTM A403 and ASME SA403 specifications are carefully followed in the construction of Midland Alloys Inc. Every product we produce satisfies strict EN and ASTM standards and our operations are ISO-certified. For a variety of applications, we provide specialized schedules, end finishing, surface treatments and customized dimensions. Our fittings serve clients across Gulf nations, Africa, Europe, and Southeast Asia, backed by in-house testing, third-party inspections, and mill certifications. We ensure on-time delivery, dedicated project support, and professional handling of both bulk and small consignments. Our goal is to build lasting partnerships based on technical excellence and consistent client satisfaction. All fittings are marked according to ASTM/ASME standards (e.g., ASTM A403 / ASME SA403) and delivered with Mill Test Certificates (MTC) validating chemical and mechanical properties.
FAQs – Stainless Steel SMO 254 Buttweld Fittings
254 SMO is comparable to AL-6XN, Alloy 926, and 6Mo austenitic stainless steels.
No, SMO 254 is non-magnetic in its annealed condition.
Both offer similar corrosion resistance, but AL-6XN has slightly higher molybdenum content.
Yes, SMO 254 has good weldability using conventional TIG and MIG techniques.
