API 5L X52 BUTTWELD FITTINGS
API 5L X52 Buttweld fittings are high-strength carbon steel piping components used in high-pressure pipeline systems. Also known as L360 grade, they offer a minimum yield strength of 52 Ksi (360 MPa), providing excellent durability, weldability, and toughness. These fittings are manufactured as per API 5L and ISO 3183 standards.
API 5L X52 buttweld fittings are widely used in onshore and offshore oil & gas pipelines, water transmission lines, petrochemical plants, and power projects. They are available in elbows, tees, reducers, caps, and stub ends with various sizes and schedules.
API 5L X52 Buttweld Fittings, API 5L X52 BW Fittings, API 5L X52 Elbow, Tee, Reducer & Cap, API 5L X52 PSL2 Buttweld Fittings, API 5L X52 Buttweld Fittings Manufacturer In India
Application of API 5L X52 Buttweld Fittings
| ● Oil & Gas Transmission Pipelines |
| ● Water Supply & Distribution Systems |
| ● Petrochemical & Refinery Piping |
| ● Power Plants & Heavy Engineering |
Specification Table of API 5L X52 Buttweld Fittings
| Specification | Details | |
|---|---|---|
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Product Specification
|
API 5L, PSL-1, PSL-2 | |
|
Size
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1/2″ to 48″ (as per ASME B16.9 / MSS SP-75) | |
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Schedule
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SCH 10, SCH 40, SCH 80, SCH 160 up to SCH XXS | |
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Type
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Elbow, Tee, Reducer, Cap, Stub End | |
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Manufacturing Standard
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ASME B16.9, MSS SP-75 | |
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Grade
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API 5L X52 / L360 | |
Delivery Condition
| PSL | Delivery Condition | Fitting Grade |
|---|---|---|
| PSL 1 | As-rolled, normalized | X52 |
| PSL 2 | Normalized, normalized & tempered | X52N |
| Quenched and tempered | X52Q | |
| Thermomechanically processed | X52M |
Process of Manufacturing
API 5L X52 buttweld fittings are manufactured from seamless or welded pipes using hot forming, cold forming, or machining processes. Heat treatment is applied as per PSL requirements to achieve specified mechanical properties. All fittings are tested and inspected according to API 5L and dimensional standards to ensure strength, weld integrity, and durability.
| Type of Fitting | PSL 1 | PSL 2 | ||
|---|---|---|---|---|
| Grade B | X52 | X52N | X52Q / X52M | |
| Elbow | ✔ | ✔ | ✔ | ✔ |
| Tee | ✔ | ✔ | ✔ | ✔ |
| Reducer | ✔ | ✔ | ✔ | ✔ |
| Cap | ✔ | ✔ | ✔ | ✔ |
| Stub End | ✔ | ✔ | ✔ | ✔ |
|
Manufactured as per ASME B16.9 / MSS SP-75 Suitable for onshore & offshore pipeline applications |
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Chemical Composition Table for API 5L X52 Buttweld Fittings (PSL 1)
| Steel Grade | Mass Fraction, % (Max) | ||||||
|---|---|---|---|---|---|---|---|
| C | Mn | P | S | V | Nb | Ti | |
| X52 | 0.26 | 1.40 | 0.030 | 0.030 | d | d | d |
|
a. Cu ≤ 0.50%, Ni ≤ 0.50%, Cr ≤ 0.50%, Mo ≤ 0.15% b. Nb + V ≤ 0.06% unless otherwise agreed c. Nb + V + Ti ≤ 0.15% d. No deliberate addition of Boron; residual B ≤ 0.001% |
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Chemical Composition Table for API 5L X52 Buttweld Fittings (PSL 2)
| Steel Grade | Chemical Composition % (max) | Carbon Equivalent | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | V | Nb | Ti | CE IIW | CE Pcm | |
| X52 | 0.26 | 0.45 | 1.60 | 0.030 | 0.030 | d | d | d | 0.43 | 0.25 |
|
a. Nb + V ≤ 0.06% unless otherwise agreed b. Nb + V + Ti ≤ 0.15% c. Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15% d. No intentional Boron addition; residual B ≤ 0.001% |
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Tensile and Yield Strength – API 5L X52 Buttweld Fittings
| Fitting Grade | Yield Strength (PSI Min) | Tensile Strength (PSI Min) | Elongation |
|---|---|---|---|
| X52 | 52,000 | 66,700 | As per API 5L |
|
a. Mechanical properties apply to parent material used for buttweld
fittings. b. Elongation calculated as per API 5L requirements. c. Applicable for both PSL 1 and PSL 2. |
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Dimensional Tolerances – API 5L X52 Buttweld Fittings
| Parameter | Tolerance |
|---|---|
| Nominal Wall Thickness (t) | −12.5% minimum, no positive tolerance limit |
| Local Wall Thickness | Permitted provided minimum thickness is maintained |
| Weld Area Thickness | Shall not be less than specified minimum thickness |
|
a. Wall thickness tolerances are as per ASME B16.9. b. API 5L X52 defines material grade; dimensional control follows fitting standards. c. Special tolerances may be agreed for critical service or large sizes. |
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