API 5L X42 BUTTWELD FITTINGS
API 5L X42 Buttweld fittings are high-quality carbon steel piping components used to connect, change direction, or terminate pipeline systems operating under moderate to high-pressure conditions. Also known as L290 grade, these fittings offer a minimum yield strength of 42 Ksi (290 MPa), making them a reliable and economical choice for oil, gas, water, and industrial fluid transportation systems. API 5L X42 buttweld fittings are manufactured in accordance with API 5L and ISO 3183 standards, ensuring excellent weldability, toughness, and dimensional accuracy.
These fittings are widely used in onshore and offshore pipeline networks, including sour service environments where resistance to corrosion and mechanical stress is essential. API 5L X42 PSL2 buttweld fittings are commonly supplied in normalized or thermomechanically processed conditions and may be coated with black paint, varnish, oil coating, or anti-corrosion finishes for enhanced service life.
API 5L X42 buttweld fittings are available in a comprehensive range of sizes, wall thicknesses, and schedules, including elbows, tees, reducers, caps, and stub ends. These fittings are extensively used in oil & gas transmission pipelines, water pipelines, petrochemical plants, power generation facilities, and structural piping systems due to their strength, durability, and ease of installation.
Revinox is a trusted supplier of API 5L X42 buttweld fittings, delivering products that comply with international quality standards and project-specific requirements. Our fittings ensure consistent performance, long service life, and reliable weld integrity in demanding applications.
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Application of API 5L X42 Buttweld Fittings
| ● Oil & Gas Transmission Pipelines |
| ● Water Supply & Distribution Systems |
| ● Petrochemical & Refinery Piping |
| ● Power Plants & Process Industries |
Specification Table of API 5L X42 Buttweld Fittings
| Specification | Details | |
|---|---|---|
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Product Specification
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API 5L, PSL-1, PSL-2 | |
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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 X42 / L290 | |
Delivery Condition
| PSL | Delivery Condition | Fitting Grade |
|---|---|---|
| PSL 1 | As-rolled, normalized | X42 |
| PSL 2 | Normalized, normalized & tempered | X42N |
| Quenched and tempered | X42Q | |
| Thermomechanically processed | X42M |
Process of Manufacturing
API 5L X42 buttweld fittings are manufactured from seamless or welded pipes through hot forming, cold forming, or machining processes. The fittings undergo heat treatment as per PSL requirements to achieve the desired mechanical properties. All fittings are inspected and tested in accordance with API 5L and applicable dimensional standards to ensure weld integrity, strength, and durability.
| Type of Fitting | PSL 1 | PSL 2 | ||
|---|---|---|---|---|
| Grade B | X42 | X42N | X42Q / X42M | |
| Elbow | ✔ | ✔ | ✔ | ✔ |
| Tee | ✔ | ✔ | ✔ | ✔ |
| Reducer | ✔ | ✔ | ✔ | ✔ |
| Cap | ✔ | ✔ | ✔ | ✔ |
| Stub End | ✔ | ✔ | ✔ | ✔ |
|
All fittings are 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 X42 Buttweld Fittings
| Steel Grade | Mass fraction, % (max) | ||||||
|---|---|---|---|---|---|---|---|
| C | Mn | P | S | V | Nb | Ti | |
| X42 | 0.26 | 1.30 | 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 X42 Buttweld Fittings
| Steel Grade | Chemical Composition % (max) | Carbon Equivalent | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | V | Nb | Ti | CE IIW | CE Pcm | |
| X42 | 0.26 | 0.45 | 1.40 | 0.030 | 0.030 | d | d | d | 0.42 | 0.25 |
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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 X42 Buttweld Fittings
| Fitting Grade | Yield Strength (PSI Min) | Tensile Strength (PSI Min) | Elongation |
|---|---|---|---|
| X42 | 42,000 | 60,200 | As per API 5L |
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a. Mechanical properties apply to the parent material used for
manufacturing buttweld fittings. b. Elongation shall be calculated in accordance with API 5L requirements. c. Properties are applicable for PSL 1 and PSL 2 material. |
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Dimensional Tolerances – API 5L X42 Buttweld Fittings
| Fitting Parameter | Tolerance | Applicable Standard |
|---|---|---|
| Outside Diameter (OD) | ±1% of Nominal OD | ASME B16.9 |
| Wall Thickness (t) | −12.5% (minimum), No maximum limit | ASME B16.9 |
| Center-to-End / Center-to-Center Dimensions | ±1.5 mm (≤ DN 200) / ±3 mm (≥ DN 250) | ASME B16.9 |
| Angular Tolerance (Elbows) | ±1° | ASME B16.9 |
| End Squareness | ±1° | ASME B16.9 |
| Concentricity | Within OD tolerance limits | ASME B16.9 |
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a. Dimensional tolerances apply to elbows, tees, reducers, caps, and
stub ends. b. API 5L X42 governs material properties; dimensional control is per ASME B16.9. c. Special tolerances may be agreed upon for large OD or critical applications. |
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| 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 |
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a. Wall thickness tolerances are as per ASME B16.9. b. API 5L X42 defines material grade; dimensional control follows fitting standards. c. Special tolerances may be agreed for critical service or large sizes. |
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