API 5L X65 BUTTWELD FITTINGS
API 5L X65 Buttweld fittings are high-strength carbon steel piping components designed for demanding, high-pressure pipeline applications. Also referred to as L450 grade, these fittings provide a minimum yield strength of 65 Ksi (450 MPa) along with excellent toughness, weldability, and resistance to mechanical and environmental stresses. They are manufactured in accordance with API 5L and ISO 3183 standards.
API 5L X65 buttweld fittings are widely used in long-distance onshore and offshore oil & gas pipelines, high-pressure water transmission systems, petrochemical and refinery piping, as well as power generation and heavy engineering projects. These fittings are available in elbows, tees, reducers, caps, and stub ends across a broad range of sizes, wall thicknesses, and schedules.
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Application of API 5L X65 Buttweld Fittings
| ● Long-Distance Oil & Gas Transmission Pipelines |
| ● High-Pressure Water & Slurry Transmission Systems |
| ● Petrochemical, Refinery & Process Piping |
| ● Power Plants & Heavy Engineering Applications |
Specification Table of API 5L X65 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 X65 / L450 | |
Delivery Condition
| PSL | Delivery Condition | Fitting Grade |
|---|---|---|
| PSL 1 | As-rolled, normalized | X65 |
| PSL 2 | Normalized, normalized & tempered | X65N |
| Quenched and tempered | X65Q | |
| Thermomechanically processed | X65M |
Manufacturing Process
API 5L X65 buttweld fittings are manufactured from seamless or welded pipes using hot forming, cold forming, or machining processes. Heat treatment is applied as per PSL 1 or PSL 2 requirements to achieve the specified mechanical properties. All fittings are tested and inspected in accordance with API 5L and applicable dimensional standards.
| Type of Fitting | PSL 1 | PSL 2 | ||
|---|---|---|---|---|
| Grade B | X65 | X65N | X65Q / X65M | |
| Elbow | ✔ | ✔ | ✔ | ✔ |
| Tee | ✔ | ✔ | ✔ | ✔ |
| Reducer | ✔ | ✔ | ✔ | ✔ |
| Cap | ✔ | ✔ | ✔ | ✔ |
| Stub End | ✔ | ✔ | ✔ | ✔ |
|
Manufactured as per ASME B16.9 / MSS SP-75 Suitable for onshore and offshore pipeline applications |
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Chemical Composition – API 5L X65 Buttweld Fittings (PSL 1)
| Grade | C | Mn | P | S | V | Nb | Ti |
|---|---|---|---|---|---|---|---|
| X65 | 0.26 | 1.65 | 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 X65 Buttweld Fittings (PSL 2)
| Grade | Chemical Composition % (Max) | Carbon Equivalent | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | V | Nb | Ti | CE IIW | CE Pcm | |
| X65 | 0.26 | 0.45 | 1.75 | 0.030 | 0.030 | d | d | d | 0.47 | 0.27 |
|
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 X65 Buttweld Fittings
| Grade | Yield Strength (Min) | Tensile Strength (Min) | Elongation |
|---|---|---|---|
| X65 | 65,000 PSI (450 MPa) | 77,000 PSI (530 MPa) | As per API 5L |
| Applicable for PSL 1 & PSL 2. Mechanical properties refer to parent material. | |||
Dimensional Tolerances – API 5L X65 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. | |