API 5L X80 BUTTWELD FITTINGS
API 5L X80 Buttweld fittings are extra high-strength carbon steel piping components designed for extremely demanding, high-pressure and high-stress pipeline applications. Also known as L555 grade, these fittings provide a minimum yield strength of 80 Ksi (555 MPa), along with excellent toughness, weldability, and resistance to mechanical fatigue and environmental conditions. They are manufactured in compliance with API 5L and ISO 3183 specifications.
API 5L X80 buttweld fittings are widely used in ultra-long-distance onshore and offshore oil & gas pipelines, high-pressure gas transmission networks, water injection and slurry pipelines, petrochemical and refinery systems, and major infrastructure and energy projects. These fittings are available in elbows, tees, reducers, caps, and stub ends in various sizes, wall thicknesses, and schedules.
API 5L X80 Buttweld Fittings, API 5L X80 BW Fittings, API 5L X80 Elbow, Tee, Reducer & Cap, API 5L X80 PSL2 Buttweld Fittings, API 5L X80 Buttweld Fittings Manufacturer In India
Application of API 5L X80 Buttweld Fittings
| ● Ultra-High-Pressure Oil & Gas Transmission Pipelines |
| ● Long-Distance Natural Gas & Hydrogen-Ready Pipelines |
| ● Petrochemical, Refinery & Critical Process Piping |
| ● Power Plants, Infrastructure & Heavy Engineering Projects |
Specification Table of API 5L X80 Buttweld Fittings
| Specification | Details | |
|---|---|---|
| Product Specification | API 5L, PSL 1, PSL 2 | |
| Size | 1/2″ to 48″ (ASME B16.9 / MSS SP-75) | |
| Schedule | SCH 10, SCH 40, SCH 80, SCH 160 up to SCH XXS | |
| Type | Elbow, Tee, Reducer, Cap, Stub End | |
| Manufacturing Standard | ASME B16.9, MSS SP-75 | |
| Grade | API 5L X80 / L555 | |
Delivery Condition
| PSL | Delivery Condition | Fitting Grade |
|---|---|---|
| PSL 1 | As-rolled, normalized | X80 |
| PSL 2 | Normalized, normalized & tempered | X80N |
| Quenched and tempered | X80Q | |
| Thermomechanically processed | X80M |
Manufacturing Process
API 5L X80 buttweld fittings are manufactured from seamless or welded pipes using advanced hot forming, controlled cold forming, or precision machining processes. Heat treatment is carried out as per PSL 1 or PSL 2 requirements to achieve the specified high-strength mechanical properties. All fittings are tested and inspected in accordance with API 5L, ISO 3183, and applicable dimensional standards.
| Type of Fitting | PSL 1 | PSL 2 | ||
|---|---|---|---|---|
| Grade B | X80 | X80N | X80Q / X80M | |
| Elbow | ✔ | ✔ | ✔ | ✔ |
| Tee | ✔ | ✔ | ✔ | ✔ |
| Reducer | ✔ | ✔ | ✔ | ✔ |
| Cap | ✔ | ✔ | ✔ | ✔ |
| Stub End | ✔ | ✔ | ✔ | ✔ |
|
Manufactured as per ASME B16.9 / MSS SP-75 Suitable for ultra-high-pressure onshore and offshore pipeline applications |
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Chemical Composition – API 5L X80 Buttweld Fittings (PSL 1)
| Grade | C | Mn | P | S | V | Nb | Ti |
|---|---|---|---|---|---|---|---|
| X80 | 0.26 | 1.85 | 0.030 | 0.030 | d | d | d |
|
Cu ≤ 0.50%, Ni ≤ 0.50%, Cr ≤ 0.50%, Mo ≤ 0.15% Nb + V ≤ 0.06%, Nb + V + Ti ≤ 0.15% No intentional Boron; residual B ≤ 0.001% |
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Chemical Composition – API 5L X80 Buttweld Fittings (PSL 2)
| Grade | Chemical Composition % (Max) | Carbon Equivalent | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | V | Nb | Ti | CE IIW | CE Pcm | |
| X80 | 0.26 | 0.45 | 1.85 | 0.025 | 0.015 | d | d | d | 0.50 | 0.28 |
|
Nb + V ≤ 0.06%, Nb + V + Ti ≤ 0.15% Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15% No intentional Boron; residual B ≤ 0.001% |
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Mechanical Properties – API 5L X80 Buttweld Fittings
| Grade | Yield Strength (Min) | Tensile Strength (Min) | Elongation |
|---|---|---|---|
| X80 | 80,000 PSI (555 MPa) | 95,000 PSI (655 MPa) | As per API 5L |
| Applicable for PSL 1 & PSL 2. Mechanical properties refer to parent material. | |||
Dimensional Tolerances – API 5L X80 Buttweld Fittings
| Parameter | Tolerance |
|---|---|
| Nominal Wall Thickness | −12.5% (minimum), no positive tolerance |
| Local Wall Thickness | Permitted if minimum thickness is maintained |
| Weld Area Thickness | Not less than specified minimum |
| Tolerances as per ASME B16.9. Special limits on request. | |