API 5L X56 TUBE
API 5L X56 tube is a high-strength carbon steel line pipe used for the transportation of
oil, gas, water,
and other fluids under high-pressure conditions. Also known as L390 tube, it offers a
minimum yield
strength of 56 Ksi (390 MPa), making it ideal for demanding pipeline and structural
applications.
API 5L X56 tubes are manufactured in accordance with :contentReference[oaicite:0]{index=0}
5L
and :contentReference[oaicite:1]{index=1} 3183 standards.
These tubes are widely used in onshore and offshore pipeline systems, including sour service
environments where high resistance to corrosion and mechanical stress is required.
API 5L X56 PSL2 tubes are commonly supplied with black paint, varnish, oil coating,
or anti-corrosion coatings for extended service life.
API 5L X56 tubes are available in various sizes, wall thicknesses, and schedules.
They are extensively used in oil & gas transmission pipelines, water pipelines,
power plants, construction, and general engineering applications.
Revinox is a trusted supplier of API 5L X56 tubes, offering products that
comply with international quality standards and project-specific requirements.
API 5L X56 Tube, API 5L X56 Tube Specifications, API 5L X56 Tube Dimensions,
API 5L X56 PSL2 Tubes, API 5L X56 Tube Schedule,
API 5L X56 Tube Manufacturer In India, API 5L X56 Tube Supplier
Application of API 5L X56 Tubes
| ● Oil & Gas Transmission Pipelines |
| ● Water Supply & Distribution Systems |
| ● Petrochemical & Refinery Applications |
| ● Offshore & Onshore Pipeline Projects |
Specification Table of API 5L X56 Tubes
| Specification |
Details |
| Product Specification |
API 5L, PSL-1, PSL-2 |
| Size |
1/2″ to 24″, sizes above 24″ NPS on request |
| Schedule |
SCH 10, SCH 40, SCH 80, SCH 160 up to SCH XXS |
| Type |
Seamless, ERW, Welded, LSAW |
| Grade |
Grade X56 / L390 |
| PSL |
Delivery Condition |
Tube Grade |
| PSL 1 |
As-rolled, normalized, normalizing formed |
X56 |
| PSL 2 |
As-rolled, normalized, normalized and tempered |
X56N |
|
Quenched and tempered |
X56Q |
|
Thermomechanical rolled or thermomechanical formed |
X56M |
| Type of Tube |
PSL 1 |
PSL 2 |
| Grade A |
Grade B |
X56 to X70 |
B to X80 |
X80 to X100 |
| SMLS |
✔ |
✔ |
✔ |
✔ |
✔ |
| LFW |
✔ |
✔ |
✔ |
|
|
| HFW |
✔ |
✔ |
✔ |
✔ |
|
| LW |
|
|
✔ |
|
|
| SAWL |
✔ |
✔ |
✔ |
✔ |
✔ |
| SAWH |
✔ |
✔ |
✔ |
✔ |
✔ |
|
SMLS – Seamless Tube
LFW – Low Frequency Welded
HFW – High Frequency Welded
SAWL – Submerged Arc Welded Longitudinal
SAWH – Submerged Arc Welded Helical
|
Chemical Composition Table For API 5L X56 TUBE
| Steel Grade |
C |
Si |
Mn |
P |
S |
V |
Nb |
Ti |
CE IIW |
CE Pcm |
|
max |
max |
max |
| Seamless & Welded Tube |
| X56N |
0.24 |
0.45 |
1.70 |
0.025 |
0.015 |
0.10 |
0.05 |
0.04 |
0.43 |
0.25 |
| X56Q |
0.18 |
0.45 |
1.70 |
0.025 |
0.015 |
0.05 |
0.05 |
0.04 |
0.43 |
0.25 |
|
Cu ≤ 0.50% | Ni ≤ 0.30% | Cr ≤ 0.30% | Mo ≤ 0.15% | No Boron
|
Tensile and Yield Strength of – API 5L X56 TUBE (PSL 1 & PSL 2)
| Tube Grade |
Yield Strength (PSI Min) |
Tensile Strength (PSI Min) |
Elongation |
Weld Seam Tensile (PSI Min) |
| X56 |
56,000 |
71,100 |
As per API 5L |
71,100 |
| Tube Grade |
Yield Strength (PSI) |
Tensile Strength (PSI) |
Y/T Ratio Max |
Weld Seam Tensile (PSI Min) |
| Min |
Max |
Min |
Max |
|
|
| X56N / X56Q / X56M |
56,000 |
80,000 |
71,100 |
95,000 |
0.93 |
71,100 |
Tolerances for Outside Diameter, Out-of-Roundness and Wall Thickness – API 5L X56
Tube
| Specified Outside Diameter D (in) |
Diameter Tolerance (in) |
Out-of-Roundness (in) |
| Except End |
Tube End |
Except End |
Tube End |
| SMLS |
Welded |
SMLS |
Welded |
| < 2.375 |
-0.031 to +0.016 |
0.048 |
0.036 |
| > 2.375 to 6.625 |
±0.0075D |
-0.016 to +0.063 |
0.020D |
0.015D |
| > 6.625 to 24 |
±0.0075D |
±0.0075D (max 0.125) |
±0.005D (max 0.063) |
0.020D |
0.015D |
| > 24 to 56 |
±0.01D |
±0.005D (max 0.160) |
±0.079 |
±0.063 |
0.015D |
0.01D |
| > 56 |
As agreed |
| Wall Thickness (in) |
Tolerance |
| SMLS Tube |
| ≤ 0.157 |
-0.012 |
| > 0.157 to < 0.948 |
+0.150t / −0.125t |
| ≥ 0.984 |
±0.1t or ±0.146 (greater) |
| Welded Tube |
| ≤ 0.197 |
±0.020 |
| > 0.197 to < 0.591 |
±0.1t |
| ≥ 0.591 |
±0.060 |
