Buttweld Fittings | ASME B16.9
Buttweld fittings are industrial piping components built to make permanent, leak-proof changes of direction, branch connections, and diameter reductions in high-pressure fluid systems. Made to standards such as ASME B16.9, this group includes elbows, tees, reducers, caps, and stubs, all designed to weld directly onto pipe ends with a circumferential butt weld. The key feature is the bore. A buttweld fitting matches the mating pipe's schedule and inside diameter, so the two line up flush. That flush fit removes internal steps and crevices, giving a smooth path for the fluid. Pressure drop stays low, flow stays clean, and the joint avoids the localized erosion-corrosion that crops up where the bore is mismatched. PM Industries manufactures, supplies, and stocks these fittings in a wide range of grades, sizes, and shapes.
The strength of a buttweld fitting comes from how it is made. We forge them from carbon steel, stainless steel, alloy steel, and nickel-base superalloys, then heat treat them to raise fracture toughness and relieve internal stress. A fully penetrated butt weld becomes part of the continuous pipeline, not a separate add-on. That gives the connection far better pressure retention, fatigue life, and tensile strength than socket weld or threaded joints. The result holds up under heavy vibration, water hammer surges, and the constant push and pull of thermal expansion, without the joint separation or leakage those forces can cause in weaker connections.
Because they hold tight under extreme pressure and stay reliable for the long haul, buttweld fittings are specified across demanding sectors. You will find them in long-distance oil and gas transmission lines, petrochemical refineries, chemical plants, and thermal power stations. They earn their place in high-temperature steam lines, cryogenic networks, and toxic chemical conduits, where containment has to be absolute and hands-on maintenance is hard or impossible.
PM Industries keeps a deep stock of buttweld fittings in a broad array of material grades, wall thicknesses, and configurations. Every fitting ships with certification and test documentation to match your project spec. Tell us your fitting type, size, schedule, and material, and we will quote it.
Specification Buttweld Fittings
| Specifications | ASTM A815 / ASME SA815 |
| Dimension Standard | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| ASME B16.9 | Standard for – Factory-Made Wrought Buttwelding Fittings |
| ASME B16.25 | Buttwelding Ends. |
| ASME B16.28 | Standard for – Butt-Welded Short Radius Elbows & Returns Bends |
| MSS SP-43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| Size Range | ½" NB to 24" NB in Sch 10s, 40s, 80s, 160s, XXS. (DN6~DN100) |
| Seamless Butt Weld Fitting Size | 1/2" - 10" |
| Welded Butt Weld Fittings Size | 1/2" - 48" |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
Pipes & Tubes are Available in Following Materials:
| Stainless Steel | SS 201, SS 202, SS 301, SS 304, SS 304L, SS 310, SS 310S, SS 316L, SS 316TI, SS 317, SS 317L, SS 321, SS 347, SS 409, SS 409M, SS 409L, SS 410, SS 410S, SS 420, SS 430, SS 431, SS 441, SS 444, SS 446, SS 17-4PH, SS 904L. |
| Duplex Steel | UNS S32205, UNS S31803 |
| Super Duplex Steel | UNS S32750, UNS S32760 |
| Alloys Steel | Alloy 20 |
| Copper Alloys | Cu-Ni 70/30, Cu-Ni 90/10, C 24000, C 75700, C 51100, C 22000, C 27200, C 21000, C 26800, C 52100, C 77000, C 52000, C 11000, C 74500, C 23000, C 28000, C 12200, C 76400, C 51900, C 75400, C 26000, C 51000, C 10200, C 27000 |
| Nickel Alloys | Nickel 200, 201 |
| Inconel | Inconel 600, 601, 625, 718, 800, 825, X-750 |
| Monel | Monel 400, k500 |
| Hastelloy | Hastelloy C-22, C-276, C-4, X |
| Titanium | Grade 1, 4, 5(Ti 6Al-4V), 6(Ti 5Al-2.5Sn), 7, 11, 6Al-2Sn-4Zr-2Mo, Grade 12, 6Al-6V-25n, Grade 23(Ti 6AL-4V ELI), 8Ai-1Mo-1V, Grade 5 ELI, Grade 9(3Al-2.5V), 6Al-7Nb. |
Test Certificates | EN 10204/3.1B, NACE MR0103, NACE MR0175 |
| Raw Materials Certificate | |
| 100% Radiography Test Report | |
| Third Party Inspection Report, etc |
Application
- Food & Beverage
- Paper Industry
- Pharmaceutical
- Hospital Equipment
- Textiles
- Dairy
- Aircraft
- Chemicals
- Others Parts in Machinery
