Buttweld Fittings
ASME B16.9 Buttweld Fittings
ASME B16.28 Short Radius Fittings
MSS SP-75 Pipeline Fittings
Seamless Butt Weld Fittings
Welded Pipe Fittings
DIN EN 10253 Fittings
JIS B2311 / B2312 Fittings
ASME B16.9 Buttweld Fittings
ASME B16.28 Short Radius Fittings
MSS SP-75 Pipeline Fittings
Seamless Butt Weld Fittings
Welded Pipe Fittings
DIN EN 10253 Fittings
JIS B2311 / B2312 Fittings

Buttweld Pipe Fittings Manufacturer, Supplier & Exporter

We are a leading buttweld fittings manufacturer and global supplier of a comprehensive range of butt weld pipe fittings designed to deliver leak-proof, full-strength connections in high-pressure and high-temperature piping systems. Our buttweld fittings — including elbows, tees, reducers, end caps, stub ends, return bends, and crosses — are manufactured in seamless and welded construction across carbon steel, stainless steel, alloy steel, duplex, super duplex, and nickel alloys. Every fitting conforms to ASME B16.9, ASME B16.28, and MSS SP-75, and is available in sizes from ½" NPS to 72" NPS (DN 15 to DN 1800) and wall thicknesses from SCH 5S to XXS. Our buttweld fittings are trusted by engineers and procurement teams in oil and gas, petrochemical, power generation, offshore, pharmaceutical, and water treatment industries across more than 60 countries.

Buttweld Pipe Fittings Manufacturer

Types of Buttweld Fittings We Manufacture

We manufacture and export the complete range of buttweld pipe fittings to ASME B16.9 and ASME B16.28, in all standard sizes, wall thicknesses, materials, and end configurations — in seamless and welded (ERW / EFW / DSAW) construction.

90° Long Radius Elbow ASME B16.9
90° Long Radius Elbow

Changes flow direction 90° with centreline radius R = 1.5D. Minimises pressure drop and turbulence — the standard choice for most process piping systems. Manufactured to ASME B16.9.

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90° Short Radius Elbow ASME B16.28
90° Short Radius Elbow

Centreline radius R = 1D for compact direction change in space-constrained layouts. Specified where long radius elbows cannot be accommodated. Manufactured to ASME B16.28.

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45° Buttweld Elbow ASME B16.9
45° Elbow

Changes flow direction by 45°. Used in combination with 90° elbows for specific pipe routing configurations. Generates lower pressure drop than a 90° elbow. Manufactured to ASME B16.9.

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180° Long Radius Return Bend ASME B16.9
180° Long Radius Return Bend

Reverses flow 180° with centreline radius R = 1.5D. Used in heat exchanger headers, furnace coils, and multi-pass piping systems. Manufactured to ASME B16.9.

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180° Short Radius Return Bend ASME B16.28
180° Short Radius Return Bend

Compact 180° flow reversal with centreline radius R = 1D. Ideal for space-limited installations where a long radius loop is not feasible. Manufactured to ASME B16.28.

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Equal Tee Buttweld Fitting ASME B16.9
Equal Tee

All three openings are the same nominal pipe size. Used to branch off 90° from the main pipe run while maintaining full bore flow in both the run and the branch. Manufactured to ASME B16.9.

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Reducing Tee Buttweld Fitting ASME B16.9
Reducing Tee

Branch outlet is smaller than the main run. Eliminates the need for a separate reducer at the branch connection. Available in a wide range of run × branch size combinations. Manufactured to ASME B16.9.

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Concentric Reducer Buttweld Fitting ASME B16.9
Concentric Reducer

Reduces pipe bore with both ends centred on the same axis. Used in vertical piping and horizontal lines where centreline alignment is essential. Manufactured to ASME B16.9.

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Eccentric Reducer Buttweld Fitting ASME B16.9
Eccentric Reducer

One side kept flat — pipe axes are offset. Flat-bottom (FOB) prevents air pocketing on pump suction lines; flat-top (FOT) facilitates drainage in horizontal piping. Manufactured to ASME B16.9.

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End Cap Buttweld Fitting ASME B16.9
End Cap (Pipe Cap)

Welded onto the open end of a pipe to seal it permanently. Used for pressure testing, system commissioning, and permanent pipe terminations in all process piping systems. Manufactured to ASME B16.9.

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Stub End Lap Joint End ASME B16.9
Stub End (Lap Joint End)

Used with a Lap Joint Flange that rotates freely for easy bolt-hole alignment. Reduces material costs by pairing alloy stub ends with carbon steel backing flanges. Manufactured to ASME B16.9.

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Cross 4-Way Buttweld Fitting ASME B16.9
Cross (4-Way Fitting)

Four openings at 90° — two in the run direction and two as branch connections. Used where two branches are required from the same point on the main pipe run. Manufactured to ASME B16.9.

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Lateral Tee Wye Fitting ASME B16.9
Lateral Tee / Wye (Y-Fitting)

Branch exits at 45° to the main run — reduces flow turbulence and pressure drop at the branch junction versus a standard 90° tee. Suitable for high-velocity fluid and slurry systems. Manufactured to ASME B16.9.

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Size Range, Wall Thickness & Construction

Our buttweld fittings are available across the full range of pipe sizes and wall thicknesses in both seamless and welded construction:
01

Size Range — ½" NPS to 72" NPS (DN 15 to DN 1800). ASME B16.9 covers up to NPS 72"; large-diameter fittings above NPS 24" are also manufactured to order.

02

Wall Thickness (Schedule) — SCH 5S · 10S · 40S · 80S · 10 · 20 · 40 · 60 · 80 · 100 · 120 · 140 · 160 · STD · XS (XH) · XXS (XXH). Wall thickness of each fitting matches the connected pipe schedule.

03

Construction — Seamless (SMLS) — Formed from solid billet or tube with no weld seam; uniform mechanical properties throughout; preferred for critical, high-pressure, and sour service applications.

04

Construction — Welded (ERW / EFW / DSAW) — Formed from plate with a longitudinal weld seam, subject to radiographic or ultrasonic examination. Cost-effective for general and large-diameter piping applications.

05

End Connections — Bevelled ends to ASME B16.25 as standard (30° bevel, 1/16" root face). Plain ends or square cut ends available on request for specific welding procedures.

Materials & Grades Available

We supply buttweld fittings in an extensive range of materials to match the mechanical, thermal, and corrosion-resistance requirements of any application. All grades are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates.

Stainless Steel Buttweld Fittings

Stainless steel buttweld fittings deliver excellent corrosion resistance and are essential in chemical, pharmaceutical, food processing, and marine environments. All grades supplied to ASTM A403 specification.

SS 304 / 304L

(ASTM A403 WP304 / WP304L) General corrosion resistance; food, dairy, and chemical service

SS 316 / 316L

(ASTM A403 WP316 / WP316L) Enhanced chloride and acid resistance; pharmaceutical, marine, and chemical processing

SS 316H

(ASTM A403 WP316H) Elevated-temperature creep strength for high-temperature process service

SS 317 / 317L

(ASTM A403 WP317 / WP317L) Higher molybdenum content; superior corrosion resistance in concentrated acid service

SS 321

(ASTM A403 WP321) Titanium-stabilised; resists sensitisation at sustained elevated temperatures

SS 347

(ASTM A403 WP347) Columbium-stabilised; ideal for heat exchangers and high-temperature piping

SS 904L

High-alloy austenitic; superior resistance to hot concentrated sulfuric and phosphoric acids

Duplex & Super Duplex Stainless Steel Buttweld Fittings

Duplex and super duplex grades offer approximately twice the yield strength of standard austenitic stainless steel, combined with excellent resistance to stress corrosion cracking and pitting — ideal for offshore, subsea, and chemical processing environments.

Duplex 2205

(UNS S31803 / S32205) Offshore topsides, chemical plant, desalination, and seawater piping

Super Duplex 2507

(UNS S32750) Seawater systems, subsea equipment, FPSOs, and high-chloride offshore environments

Super Duplex Zeron 100

(UNS S32760) High-temperature, high-chloride offshore and subsea service applications

Nickel Alloy Buttweld Fittings

For the most aggressive corrosive environments — concentrated acids, caustic solutions, sour gas service, and extreme temperatures — we offer buttweld fittings in a full range of nickel alloys.

Inconel 600

(UNS N06600) High-temperature oxidation and carburisation resistance

Inconel 625

(UNS N06625) Outstanding broad-spectrum corrosion resistance; offshore, chemical, and subsea service

Incoloy 825

(UNS N08825) Resistance to phosphoric and sulfuric acids; FGD systems and chemical plant

Hastelloy C276

(UNS N10276) Universal corrosion resistance across the widest range of aggressive process media

Hastelloy C22

(UNS N06022) Superior resistance to oxidising and reducing acids and pitting attack

Monel 400

(UNS N04400) Suitable for seawater, hydrofluoric acid, and marine and alkali service

Alloy 20

(UNS N08020) Engineered for sulfuric acid and aggressive chemical process service

Titanium Grade 2

Exceptional corrosion resistance in seawater and oxidising media at low density

Copper-Nickel 90/10 & 70/30

(C70600 / C71500) Preferred for marine seawater piping and naval condenser systems

Carbon Steel Buttweld Fittings

Carbon steel is the most widely specified material for general-purpose, hydrocarbon, and elevated-temperature service. The primary grade is ASTM A234 WPB for standard service. For high-yield pipeline fittings, we supply ASTM A860 WPHY grades to MSS SP-75.

ASTM A234 WPB

Standard carbon steel; primary grade for general-purpose process piping buttweld fittings

ASTM A420 WPL6

Impact-tested carbon steel for low-temperature service down to -46°C (-50°F); LNG and cryogenic piping

ASTM A860 WPHY 42 / 52 / 60 / 65 / 70

High-yield pipeline fittings to MSS SP-75; used in high-pressure oil, gas, and liquid transmission pipelines

Alloy Steel Buttweld Fittings

Chromium-molybdenum alloy steel buttweld fittings are specified for high-temperature, high-pressure service in power generation, petrochemical, and refinery applications. All grades supplied to ASTM A234 specification.

ASTM A234 WP5

(5% Cr · ½% Mo) Refinery high-temperature service; hydrotreating and catalytic reforming units

ASTM A234 WP9

(9% Cr · 1% Mo) High-temperature hydrogen-rich process service and steam piping

ASTM A234 WP11

(1¼% Cr · ½% Mo) Thermal power plant steam, feedwater, and reheat piping

ASTM A234 WP22

(2¼% Cr · 1% Mo) Reactors and high-temperature pressure piping systems in petrochemical plants

ASTM A234 WP91

(9% Cr · 1% Mo · V · Nb) Ultra-supercritical steam power plant main steam and hot reheat piping

Buttweld Fittings Standards & Specifications

Our buttweld pipe fittings are manufactured and inspected to the following internationally recognised standards:
Standard
Scope
ASME B16.9

Factory-made wrought buttwelding fittings — elbows (long radius), tees, reducers, caps, stub ends, return bends. Primary governing standard.

ASME B16.28

Wrought steel buttwelding short radius elbows and returns — centreline radius R = 1D; 90° and 180° short radius configurations.

MSS SP-75

High-test wrought buttwelding fittings — high-yield pipeline grades WPHY 42, 52, 60, 65, and 70 for high-pressure transmission pipelines.

MSS SP-43

Wrought and fabricated buttwelding fittings for low-pressure, corrosion-resistant applications — light-wall stainless steel (SCH 5S and 10S).

ASME B16.25

Buttwelding ends — governs bevel angle, root face, and bore dimensions for weld end preparation on all buttweld fittings.

EN 10253-1 / 10253-2

European standard for buttwelding pipe fittings — Type A (plain ends) and Type B (ends with specific weld bevel tolerances).

DIN 2605 / 2615 / 2616 / 2617

German standard buttwelding fittings — elbows, tees, reducers, and end caps conforming to DIN PN-rated specifications.

JIS B2311 / B2312 / B2313

Japanese industrial standard buttwelding fittings — applicable to projects following Japanese piping codes and specifications.

Size Range: ½" NPS to 72" NPS (DN 15 to DN 1800)
Wall Thickness: SCH 5S / 10S / 40S / 80S / 10 / 20 / 40 / 60 / 80 / 100 / 120 / 140 / 160 / STD / XS / XXS
Construction: Seamless (SMLS) · Welded (ERW / EFW / DSAW)

Frequently Asked Questions

Buttweld Fittings

What is the difference between ASME B16.9 and ASME B16.28 buttweld fittings?

ASME B16.9 is the primary standard covering factory-made wrought buttwelding fittings including long radius elbows (R = 1.5D), tees, reducers, caps, stub ends, and return bends. ASME B16.28 specifically covers short radius 90° elbows and 180° returns (R = 1D), which are not covered under B16.9. Both standards are dimensionally compatible and are widely used together on the same piping projects.

Seamless (SMLS) fittings are formed from a solid billet or tube with no weld seam — providing uniform mechanical properties throughout. Welded fittings are formed from plate with a longitudinal weld seam, which is subject to radiographic or ultrasonic examination. Seamless fittings are preferred for critical, high-pressure, and sour service; welded fittings are cost-effective for general and larger-diameter piping applications.

A concentric reducer has both ends centred on the same pipe axis — used in vertical piping and where centreline alignment is required. An eccentric reducer has one flat side, so the centreline of the two pipe ends is offset. Flat-bottom (FOB) eccentric reducers are used on horizontal pump suction lines to prevent air pocketing; flat-top (FOT) facilitates gravity drainage in horizontal process lines.

The wall thickness must match the pipe it is butt-welded to. Schedule is determined by the pipe's design pressure, temperature, material grade, and the applicable piping code (ASME B31.3, B31.1, B31.4, or B31.8). Common schedules are SCH 40 (standard), SCH 80 (extra heavy), and SCH 160. SCH 10 and 5S are used for light-wall stainless steel sanitary and instrumentation piping systems.

A Stub End is butt-welded to the pipe at its bevelled end; a Lap Joint Flange slides over the pipe and rotates freely around the stub end lap, allowing easy bolt-hole alignment and quick disassembly without rotating the pipe. It is specified for systems requiring frequent dismantling for cleaning or inspection, and allows the use of an expensive alloy stub end paired with a less costly carbon steel backing flange — reducing overall material costs significantly.

Yes. We supply buttweld fittings manufactured from NACE MR0175 / ISO 15156-compliant materials with controlled hardness values. For carbon steel ASTM A234 WPB, hardness is controlled to ≤ 22 HRC (≤ 237 HB). Stainless steel grades (SS 316L), duplex 2205, super duplex 2507, and Inconel 625 are also available with NACE compliance. Material test certificates confirming chemical composition, mechanical properties, and hardness are provided with every order.

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