Buttweld Pipe Fittings

What are buttweld pipe fittings?

Buttweld (butt-weld) fittings are factory-made wrought fittings with beveled ends that join to pipe by full-penetration welding. Unlike socket-weld or threaded forged fittings, the weld becomes part of the pressure boundary and gives a smooth bore for flow. Most industrial packages follow ASME B16.9 for dimensions and ASTM/ASME material specs for chemistry and mechanicals.

This page is the buttweld fittings category homepage for Savoy Piping Inc. Browse the fitting types in the product grid below, and use the PRODUCTS sidebar for stainless, carbon, alloy, duplex, nickel, copper-nickel and titanium grades.

Standards that define the package

Dimensional control is usually ASME B16.9 (factory-made wrought buttwelding fittings) or ASME B16.28 for short-radius elbows and returns. Material is ordered to the ASTM wrought-fitting specification that matches the pipe:

• Stainless — ASTM A403 / ASME SA403 (WP304, WP316L, WP321, WPS31254, and related)
• Carbon / high-yield — ASTM A234 WPB/WPC, A420 WPL6 (LTCS), A860 WPHY 42–65
• Chrome-moly alloy — ASTM A234 WP5, WP9, WP11, WP22, WP91
• Duplex / super duplex — ASTM A815 (S31803, S32205, S32750, S32760)
• Nickel alloys — ASTM B366 (Inconel, Incoloy, Monel, Hastelloy, 904L)
• Copper-nickel — ASTM B122 / related CuNi classes (90/10, 70/30)
• Titanium — ASTM SB363 (e.g. WPT2, WPT5 / Grade 2 & 7)

Related hubs: ASTM buttweld fittings · ASME buttweld fittings · dimension charts.

Fitting forms we supply

Common ASME B16.9 forms stocked and made to order:

• 45° elbows and 90° elbows — long radius (1.5D) or short radius (1.0D)
• 180° returns for U-turns and exchanger loops
• Equal tees and reducing tees for branch connections
• Concentric and eccentric reducers for line-size changes
• End caps, crosses, and lap-joint stub ends
• Pipe bends — 3D, 5D, 10D, induction and piggable bends when radius is project-specified

Sizes, schedules and construction

Typical supply covers about ½" NB to 48" NB (project-dependent), in schedules from Sch 10s through XXS / custom wall. Seamless fittings are common in smaller sizes; welded / fabricated fittings cover larger OD. Always match the fitting construction and WP class to the piping class and WPS. Marking normally includes size, schedule or wall, material grade, heat number and manufacturer identification for full traceability.

How to choose the right grade

• General stainless process — start with 304 / 304L; move to 316L for chlorides and tougher chemicals
• High temperature / stabilized — 321, 347, or chrome-moly WP11 / WP22 / WP91 matched to A335 pipe
• Low temperature carbon — A420 WPL6 with A333 Gr.6 pipe systems
• Pipeline / high yield — A860 WPHY grades aligned to API 5L strength levels
• Seawater / high PREN — duplex 2205, super duplex 2507, or 6Mo / SMO 254
• Severe corrosion — Inconel 625, Hastelloy C276, Monel 400, or titanium Grade 2/7

What to put on the enquiry or purchase order

To quote quickly, include: material grade / UNS and ASTM class (e.g. A403 WP316L), fitting type and angle/radius (45° LR, 90° SR, concentric reducer, etc.), size and schedule or wall, seamless or welded, quantity, destination, and documentation (EN 10204 3.1 or 3.2, PMI, NACE MR0175 notes, third-party inspection). Email sales@savoypipinginc.com or use the Request Quote button above.

Documentation and inspection

Supply packages can include mill test certificates, heat-number traceability, dimensional reports, and optional NDT (RT/UT/PT/MT) or buyer/TPI attendance. Products are marked per applicable ASTM/ASME requirements so each fitting ties back to the certified heat.

Typical applications

Buttweld fittings are used wherever welded piping must change direction, branch, reduce or terminate — oil & gas and refining, chemical and petrochemical plants, power and utility steam lines, water treatment, marine and offshore modules, skids and fabrication yards. Pair fittings with matching pipe, flanges and forged fittings from the same material family when the project requires a single MTC trail.

Frequently asked questions

What are buttweld pipe fittings?

Buttweld pipe fittings are ASME B16.9 (and related) butt-weld fittings used to change direction, branch, reduce, or close a line with a full-penetration weld.

How do I use this buttweld fittings hub?

Start here for the full category. Open a fitting type from the product grid, or pick a material grade from the PRODUCTS sidebar, then continue to the grade or form page for specs and enquiry.

Which standards apply?

Dimensional: ASME B16.9 / B16.28. Material: ASTM/ASME grade specs (e.g. A403, A234, A420, A860, A815, B366). Confirm edition and WP/WPHY class on the PO.

Seamless or welded fittings?

Both are supplied. Seamless is common for smaller sizes; welded (fabricated) covers larger OD. Match the construction to your piping class.

What size range is available?

Typical coverage is about ½" NB to 48" NB in common schedules (Sch 10s to XXS) or custom wall — confirm large OD and exotic alloys against stock and lead time.

What should be on the purchase order?

Grade/UNS, fitting type and degree/radius, size/schedule or wall, seamless or welded, standard (B16.9), quantity, MTC (EN 10204 3.1/3.2), and any NACE/PMI/NDT extras.

What materials and forms are listed here?

Materials include stainless (A403), carbon (A234/A420/A860), chrome-moly (A234 WP*), duplex (A815), nickel alloys (B366), copper-nickel and titanium. Forms include 45°/90° elbows, tees, reducers, caps, crosses, stub ends and pipe bends.