API 5L X80 PLATE / SHEET / COIL
API 5L X80 plates, sheets, and coils are ultra high-strength carbon steel products designed for long-distance oil & gas transmission pipelines, pressure vessels, and critical structural applications. Also known as L555, this grade offers a minimum yield strength of 80 Ksi (555 MPa), delivering exceptional strength, toughness, and weldability for extremely high-pressure service conditions.
Manufactured in accordance with API 5L and ISO 3183 standards, API 5L X80 plates and coils provide superior mechanical performance, excellent formability, and enhanced resistance to mechanical and environmental stress. These products are suitable for both onshore and offshore applications operating under severe and corrosive service environments.
API 5L X80 plates, sheets, and coils are available in a wide range of thicknesses, widths, and surface finishes to meet demanding fabrication and project requirements. They are extensively used for pipe manufacturing, heavy structural fabrication, storage tanks, and advanced industrial engineering projects.
Revinox is a reliable supplier of API 5L X80 plates, sheets, and coils in India, supplying products that conform to international quality standards with excellent dimensional accuracy, durability, and long service life.
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Applications of API 5L X80 Plate, Sheet & Coil
| ● Long-Distance Oil & Gas Transmission Pipelines |
| ● Ultra High-Pressure Pressure Vessels & Storage Tanks |
| ● Offshore & Subsea Pipeline Systems |
| ● Heavy Structural & Advanced Industrial Fabrication |
Specification Table of API 5L X80 Plate / Sheet / Coil
| Specification | Details | |
|---|---|---|
| Product Specification | API 5L, PSL-1, PSL-2 | |
| Thickness | 4 mm to 120 mm (Custom thickness available) | |
| Width | 1000 mm to 3200 mm | |
| Form | Plate, Sheet, Coil | |
| Grade | API 5L X80 / L555 | |
Delivery Condition
| PSL | Delivery Condition | Product Grade |
|---|---|---|
| PSL 1 | As-rolled, normalized | X80 |
| PSL 2 | Normalized, normalized & tempered | X80N |
| Quenched and tempered | X80Q | |
| Thermomechanically rolled (TMCP) | X80M |
Process of Manufacturing
| Product Form | Manufacturing Process | PSL 1 | PSL 2 |
|---|---|---|---|
| Plate | Hot Rolled (HR) | ✔ | ✔ |
| Plate | Controlled Rolled (CR) | ✔ | ✔ |
| Plate | Thermo-Mechanical Controlled Process (TMCP) | ✔ | ✔ |
| Sheet | Hot Rolled Pickled & Oiled (HRPO) | ✔ | ✔ |
| Coil | Hot Rolled Coil (HRC) | ✔ | ✔ |
| Heat treatment such as normalizing, quenching & tempering, or TMCP is applied as per API 5L PSL 1 or PSL 2 requirements to achieve the specified mechanical properties for API 5L X80 grade. | |||
Chemical Composition Table For API 5L X80 Plate / Sheet / Coil
| Steel Grade | Mass fraction, % (Heat & Product Analysis) | ||||||
|---|---|---|---|---|---|---|---|
| C | Mn | P | S | V | Nb | Ti | |
| max | max | max | max | max | max | max | |
| API 5L X80 Plate / Sheet / Coil (PSL 1) | |||||||
| X80 | 0.26 | 1.80 | 0.030 | 0.030 | d | d | d |
|
a. Cu ≤ 0.50%, Ni ≤ 0.50%, Cr ≤ 0.50%, Mo ≤ 0.15% b. Mn increase permitted with reduced carbon as per API 5L limits c. Nb + V ≤ 0.06% unless otherwise agreed d. Nb + V + Ti ≤ 0.15% e. No deliberate addition of Boron; residual B ≤ 0.001% |
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Chemical Composition Table for API 5L X80 Plate / Sheet / Coil
| Steel Grade | Mass fraction, % (Heat & Product Analysis) | Carbon Equivalent | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | V | Nb | Ti | Other | CE IIW | CE Pcm | |||||||||||
| max | max | max | max | max | max | max | max | max | max | ||||||||||||
| API 5L X80 Plate / Sheet / Coil (PSL 2) | |||||||||||||||||||||
| X80N | 0.16 | 0.45 | 1.90 | 0.025 | 0.015 | 0.10 | 0.06 | 0.04 | d,e,l | 0.50 | 0.25 | ||||||||||
| X80Q | 0.14 | 0.45 | 1.90 | 0.025 | 0.015 | 0.08 | 0.06 | 0.04 | e,l | 0.50 | 0.25 | ||||||||||
| X80M | 0.16 | 0.45 | 1.90 | 0.025 | 0.015 | d | d | d | e,l | 0.50 | 0.25 | ||||||||||
|
a. Carbon equivalent limits apply as per API 5L PSL 2
requirements b. Mn increase permitted with reduced carbon as per API 5L limits c. Nb + V ≤ 0.06% unless otherwise agreed d. Nb + V + Ti ≤ 0.15% e. Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15% unless otherwise agreed l. No intentional addition of Boron; residual B ≤ 0.001% |
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Tensile and Yield Strength – API 5L X80 Plate / Sheet / Coil (PSL 1 & PSL 2)
Tensile & Yield Strength – API 5L X80 Plate / Sheet / Coil
| Steel Grade | Yield Strength | Tensile Strength | Elongation (%) | ||
|---|---|---|---|---|---|
| Min (MPa) | Min (PSI) | Min (MPa) | Min (PSI) | ||
| X80 | 555 | 80,500 | 625 | 90,700 | As per API 5L |
Notes:
• Mechanical properties apply to API 5L X80 plates, sheets, and coils.
• Elongation values shall be calculated as per API 5L specification.
• Material is suitable for forming, welding, and ultra-high-pressure pipeline
applications.
Dimensional Tolerances – API 5L X80 Plate / Sheet / Coil
| Parameter | Tolerance |
|---|---|
| Thickness | ± 10% of specified thickness |
| Width | ± 5 mm |
| Length | −0 / +10 mm |
| Flatness | As per mill standard / agreement |
Notes:
• Applicable to API 5L X80 plates, sheets, and coils only.
• OD, out-of-roundness, and wall thickness tolerances are not applicable to flat
products.
• Special tolerances can be supplied on request.