Welded Buttweld Pipe Fittings Manufacturer and Exporter
Amardeep Steel Centre is a certified manufacturer, supplier, stockist, and exporter of Welded Buttweld Pipe Fittings conforming to ASME B16.9, ANSI B16.9, and MSS SP-43 standards. We have Stainless Steel, Alloy Steel, Carbon Steel, Duplex Steel, Super Duplex Steel, Nickel Alloy and Cupro Nickel buttweld fittings in sizes 1/2 NB to 48 NB. We manufacture and export welded buttweld pipe fittings to use in oil and gas, petrochemical, power generation, pharmaceutical, paper and pulp, and fertilizer industries. All fittings are subjected to inspection of dimensions, visual inspection and mechanical testing
under ASTM, ASME and DIN and EN standards. Amardeep Steel Centre has nearly twenty years of manufacturing experience and an ISO certified plant in India, offering welded buttweld fittings with full material test reports, mill certificates and third party inspection service.
Need a quote for Welded Buttweld Pipe Fittings? Contact our technical sales team for pricing, availability, and delivery timelines. We supply to 40 plus countries worldwide.
Request a QuoteWhat Are Welded Buttweld Pipe Fittings?
Welded buttweld pipe fittings are pipe fittings made of hot rolled stainless steel pipes, carbon steel pipes, alloy steel plates or formed half-shells that are seam welded along their axis. They are employed to join, divert, branch or break off sections of a piping system with a butt weld joint on the fitting end. In comparison to seamless fittings, which are shaped out of a solid billet, welded buttweld fittings are visible as they have a visible seam weld that is inspected with 100 percent X-ray radiography to ensure weld integrity.
According to ASME B16.9, the standard of factory-made wrought buttwelding fittings, the welded fittings shall conform to the same dimensional tolerances and pressure ratings as seamless fittings of the corresponding material grade and wall-thickness. This renders them an inexpensive and efficient option in large bore piping systems, offshore platforms, power plants and chemical processing plants where size ranges exceeding 24 NB are needed.
How Welded Buttweld Fittings Are Manufactured
Welded buttweld fittings are manufactured through one of two primary processes. In the first method, a hot rolled pipe section is cut, heated to the forming temperature, and pressed into the required shape such as an elbow, tee, or reducer on a mandrel die. In the second method, flat steel plates are pressed into half shells or quarter segments, welded along longitudinal seams, and then formed into the final fitting shape. The seam welds are subjected to visual examination and radiographic or ultrasonic testing per applicable ASTM and ASME specifications before the fittings are released for dispatch.
Welded vs Seamless Buttweld Fittings: Key Differences
| Parameter | Welded Buttweld Fittings | Seamless Buttweld Fittings |
| Manufacturing | Hot rolled pipe or plate, seam welded | Extruded from solid billet, no weld |
| Weld Seam | Present, verified by X-ray or UT | Absent |
| Size Range | Common for large bore (above 24 NB) | Standard for smaller sizes (below 24 NB) |
| Cost | Lower for large sizes | Higher for large sizes |
| Pressure Rating | Equal to seamless per ASME B16.9 when X-ray passed | Inherently higher integrity |
| Standard | ASME B16.9, MSS SP-43 | ASME B16.9, MSS SP-43 |
ANSI B16.9 Welded Fittings Specification
| Parameter | Details |
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS SP-43 |
| Size Range | 1/2 NB to 48 NB (DN 15 to DN 1200) |
| Form | Welded Buttweld Fittings (100% X-Ray Welded and Fabricated) |
| Wall Thickness | Sch 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS |
| Fitting Types | Elbow (45°, 90°, 180°), Equal Tee, Reducing Tee, Concentric Reducer, Eccentric Reducer, End Cap, Stub End, Cross |
| End Finish | Plain ends (standard) or Beveled ends per ASME B16.25 on request |
| Test Standards | ASTM A960, Hydrostatic test, Radiography, Ultrasonic examination |
| Value Added Services | Hot Dip Galvanizing, Epoxy Coating, FBE Coating, Electro Polish, Sand Blasting, Threading, Soldering |
| Origin | Indian Origin, Japanese Origin, Korean Origin, European Origin |
Manufacturing Standards and Material Compliance
| Standard Body | Applicable Standards |
| ASME | ANSI B16.9, ANSI B16.28, MSS SP-43 |
| DIN | DIN 2605, DIN 2615, DIN 2616, DIN 2617, DIN 28011 |
| EN | EN 10253-1, EN 10253-2 |
| ASTM A403 / ASME SA403 | Standard for Wrought Austenitic Stainless Steel Piping Fittings |
| ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.25 | Buttwelding Ends preparation for welding |
| ASME B16.28 | Wrought Steel Short Radius Elbows and Buttwelding Returns |
| MSS SP-43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure Corrosion Resistant Applications |
Material Grades for ASME B16.9 Welded Buttweld Fittings
Stainless Steel Welded Buttweld Fittings
Stainless Steel Welded Buttweld Fittings conform to ASTM A403 and are available in grades WP304, WP304L, WP316, WP316L, WP321, WP347, 310, 317L, and 904L. DIN equivalents include 1.4301, 1.4306, 1.4401, and 1.4404. These fittings are widely used in chemical, pharmaceutical, and food processing industries due to their superior corrosion resistance and cleanability.
Carbon Steel Welded Buttweld Fittings
Carbon Steel Welded Buttweld Fittings are manufactured per ASTM A234 and ASME SA234 in grades WPB, WPBW, WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65, and WPHY 70. Low temperature carbon steel grades ASTM A420 WPL3 and WPL6 are also available. Carbon Steel Welded Buttweld Fittings are the most widely specified fittings in oil and gas pipelines, structural piping, and general industrial systems.
Alloy Steel Welded Buttweld Fittings
Alloy Steel Welded Buttweld Fittings are supplied per ASTM/ASME A/SA 234 in grades WP1, WP5, WP9, WP11, WP12, WP22, and WP91. These fittings are engineered for high-temperature and high-pressure service in power generation boilers, heat exchangers, and refinery process lines. Grade WP91 (9 percent Chromium, 1 percent Molybdenum) is specified for creep-resistant applications above 550 degrees Celsius.
Duplex and Super Duplex Steel Welded Buttweld Fittings
Duplex and Super Duplex Steel Welded Buttweld Fittings conform to ASTM A815 and ASME SA815 in UNS grades S31803, S32205, S32750, and S32950. Werkstoff No. 1.4462 is the DIN equivalent for Duplex 2205. These fittings offer twice the yield strength of standard austenitic stainless steel and are used in seawater handling, subsea pipeline systems, and chloride-rich chemical processing.
Nickel Alloy Welded Buttweld Fittings
Nickel Alloy Welded Buttweld Fittings are available per ASTM B366 and ASME SB366 in Nickel 200, Nickel 201, Monel 400, Monel 500, Inconel 600, Inconel 601, Inconel 625, Incoloy 800, Incoloy 825, Hastelloy C276, Alloy 20, Titanium Grade I and II, and Cupro-Nickel 70/30. These exotic alloy fittings are used in highly corrosive environments such as sulphuric acid, hydrofluoric acid, and marine service applications.
ASME B16.9 Welded Buttweld Fittings Dimensions and Tolerances
All welded buttweld fittings supplied by Amardeep Steel Centre conform to the dimensional requirements of ASME B16.9 Table 1 through Table 8. The tolerance chart below summarizes the critical plus and minus values for all fitting sizes.
| NPS | OD at Bevel | ID at End | Wall Thickness | Centre to End (A,B,C,M) | Overall Length (Caps) |
| 1/2 to 2-1/2 | +0.06 / -0.03 | +/-0.03 | Min 87.5% of nominal | +/-0.06 | +/-0.12 |
| 3 to 3-1/2 | +/-0.06 | +/-0.06 | Min 87.5% of nominal | +/-0.06 | +/-0.12 |
| 4 | +/-0.06 | +/-0.06 | Min 87.5% of nominal | +/-0.06 | +/-0.12 |
| 5 to 8 | +0.09 / -0.06 | +/-0.06 | Min 87.5% of nominal | +/-0.06 | +/-0.25 |
| 10 to 18 | +0.16 / -0.12 | +/-0.12 | Min 87.5% of nominal | +/-0.09 | +/-0.25 |
| 20 to 24 | +0.25 / -0.19 | +/-0.19 | Min 87.5% of nominal | +/-0.09 | +/-0.25 |
| 26 to 30 | +0.25 / -0.19 | +/-0.19 | Min 87.5% of nominal | +/-0.12 | +/-0.38 |
| 32 to 48 | +0.25 / -0.19 | +/-0.19 | Min 87.5% of nominal | +/-0.19 | +/-0.38 |
All dimensions are in inches. Tolerances are equal plus and minus unless otherwise noted.
Industries and Applications for Welded Buttweld Fittings
Welded buttweld pipe fittings manufactured to ASME B16.9 are specified across a wide range of heavy industries. The permanent butt weld joint creates a continuous metal path that eliminates potential leak paths at the fitting connection, making these fittings the preferred choice for high-pressure, high-temperature, and corrosion-critical service lines. Amardeep Steel Centre regularly supplies welded buttweld fittings to the following industries:
- Oil and Gas: Upstream flowlines, midstream transmission pipelines, downstream refinery process piping
- Petrochemical: Reactor feed lines, heat exchanger headers, catalytic cracker piping
- Power Generation: Boiler feed water lines, steam distribution headers, turbine bypass piping
- Pharmaceutical: Clean utility systems, sterile piping, WFI (water for injection) distribution loops
- Chemical Processing: Acid transfer lines, solvent process piping, reactor effluent systems
- Paper and Pulp: Bleaching plant piping, digester feed lines, pulp transport systems
- Nuclear: Safety-class process piping, feedwater systems, reactor coolant auxiliary lines
- Fertilizer: Ammonia synthesis loops, urea plant piping, high-pressure gas lines
Why Choose Amardeep Steel for Welded Buttweld Pipe Fittings
Amardeep Steel Centre has been manufacturing and exporting welded buttweld pipe fittings for over two decades from our ISO-certified facility in India. Our fittings are approved by major Indian and international engineering procurement clients across 40 plus export destinations including USA, UAE, Saudi Arabia, UK, Germany, Singapore, Australia, and South Africa.
Request a Price Quote for Welded Buttweld Pipe Fittings
Our technical sales team responds within 24 hours. Send us your specifications and quantity for a detailed quotation with delivery timelines and material certificates.
Frequently Asked Questions - Welded Buttweld Pipe Fittings
What is the difference between seamless and welded buttweld pipe fittings?
Seamless buttweld fittings are formed from a single piece of solid material without any weld seam, giving them inherently higher pressure resistance. Welded buttweld fittings are fabricated from hot rolled pipes or plates that are joined by seam welding. When 100 percent X-ray inspected, welded buttweld fittings meet the same ASME B16.9 pressure ratings as seamless fittings and are the standard choice for large bore applications above 24 NB where seamless material is not economically available.
Which standard governs welded buttweld pipe fittings?
Welded buttweld pipe fittings are manufactured and inspected per ASME B16.9 (factory-made wrought buttwelding fittings), ASME B16.28 (short radius elbows and returns), and MSS SP-43 for low pressure corrosion-resistant buttwelding fittings. Welding end preparation follows ASME B16.25.
What material grades are available for ASME B16.9 welded buttweld fittings?
Amardeep Steel Centre supplies ASME B16.9 welded buttweld fittings in Stainless Steel (ASTM A403 WP304/316), Carbon Steel (ASTM A234 WPB), Alloy Steel (WP9, WP11, WP22, WP91), Duplex Steel (ASTM A815 S31803, S32205), Super Duplex (S32750), and Nickel Alloys (Inconel, Monel, Hastelloy, Incoloy).
What size range do welded buttweld pipe fittings cover under ASME B16.9?
ASME B16.9 covers factory-made wrought buttwelding fittings in sizes from NPS 1/2 (DN 15) through NPS 48 (DN 1200) in all standard wall thicknesses per ASME B36.10 and ASME B36.19, from Schedule 5S to Schedule XXS.
What documentation is provided with welded buttweld pipe fittings?
Amardeep Steel Centre provides Material Test Reports (MTR) per EN 10204 3.1, dimensional inspection reports, heat treatment certificates, radiography reports for welded fittings, hydrostatic test reports on request, and NACE MR0175 compliance documents for sour service applications.