L415 is a pipeline steel grade in the API 5L standard: "L" denotes line pipe steel and "415" a minimum yield strength of 415 MPa (approximately 60 ksi), which corresponds to Grade X60. Through microalloying design and controlled rolling and cooling (TMCP), the grade achieves improved toughness while maintaining strength. GNEE Pipe supplies L415 ERW line pipe manufactured by high-frequency induction (HFI) welding, in PSL1 and PSL2 quality levels, to API 5L and the equivalent Chinese standard GB/T 9711.
Key Specifications
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Standard: API 5L (latest edition) / GB/T 9711; PSL1 and PSL2 available.
Process: ERW, high-frequency induction (HFI) welding without filler metal, with weld-seam heat treatment.
Size range: NPS 2" – 24" (OD 60.3 – 609.6 mm), wall thickness per schedule as listed below.
Delivery condition: L415M (TMCP), L415N (normalized), or L415Q (quenched and tempered) - the delivery condition suffix (M, N, or Q) must be specified on the purchase order per API 5L 46th Edition.
Length: SRL 5.8–6.0 m, DRL 11.8–12.0 m, or fixed lengths.
Ends: plain end or beveled end, to drawing.
Documentation: full mill test certificate (MTC) and third-party inspection on request.
Size and Weight Chart (ERW)
Standard dimensions to ASME B36.10M; other wall thicknesses are available on request.
| NPS (in) | OD (mm) | Wall thickness (mm) | Schedule | Weight (kg/m) |
|---|---|---|---|---|
| 2" | 60.3 | 3.91 | SCH 40 | 5.44 |
| 4" | 114.3 | 6.02 | SCH 40 | 16.07 |
| 6" | 168.3 | 7.11 | SCH 40 | 28.26 |
| 8" | 219.1 | 8.18 | SCH 40 | 42.55 |
| 12" | 323.9 | 10.31 | SCH 40 (STD) | 79.73 |
| 16" | 406.4 | 12.70 | SCH 40 (STD) | 123.17 |
| 20" | 508.0 | 9.53 / 12.70 / 15.09 | SCH 20 / SCH 30 (STD) / SCH 40 | 117.20 / 155.00 / 183.42 |
| 24" | 609.6 | 9.53 / 17.48 / 30.96 | SCH 20 (STD) / SCH 40 (XS) / SCH 80 | 140.81 / 255.73 / 441.62 |
Note: Schedule designations follow ASME B36.10M. For NPS ≥ 12", STD and SCH 40 are no longer the same wall - verify the exact wall thickness required by your design before ordering.
Technical Parameters: L415 (X60) PSL1 Vs. PSL2
| Property | L415 PSL1 | L415 PSL2 (Recommended) |
|---|---|---|
| Yield strength (min) | 415 MPa (60,200 psi) | 415 MPa (60,200 psi) |
| Yield strength (max) | Not specified | 565 MPa (N delivery condition) |
| Tensile strength (min) | 535 MPa (77,600 psi) | 535 MPa (77,600 psi) |
| Tensile strength (max) | Not specified | 760 MPa |
| Yield-to-tensile ratio | Not required | ≤ 0.93 (applies to OD > 323.9 mm) |
| Carbon (C), max | 0.26% (welded) | 0.12% (M) / 0.24% (N) / 0.18% (Q) |
| Sulfur (S), max | 0.030% | 0.015% |
| Phosphorus (P), max | 0.030% | 0.025% |
| Carbon equivalent (CEIIW) | Not required | ≤ 0.43 |
| Crack sensitivity (Pcm) | Not required | ≤ 0.25 |
| Charpy V-notch impact | Not required | Mandatory, at temperature specified in order |
| Hardness (max) | Not required | 250 HV10 (sour service: ≤ 248) |
| NDT | Basic | 100% UT of weld seam |
| Traceability | Limited | Full (heat to pipe) |
Exact values per the governing standard edition and order specification. Measured values are stated on the mill test certificate for each heat.
Material Properties
L415 is a microalloyed high-strength steel whose toughness and weldability are controlled by composition and thermomechanical processing. The typical composition contains low carbon, controlled manganese, and trace additions of niobium, vanadium, and titanium. Combined with TMCP, this produces a fine-grained structure that provides:
Improved low-temperature toughness: Charpy V-notch impact energy verified at the test temperature specified in the order (commonly 0 °C or −20 °C), per API 5L / GB/T 9711 requirements for the grade and size.
Good weldability: carbon equivalent (CEIIW) ≤ 0.43 and weld-crack sensitivity (Pcm) ≤ 0.25 for PSL2.
Controlled ductility: yield-to-tensile ratio ≤ 0.93 (PSL2, for OD > 323.9 mm), preventing overmatching issues during field welding.
If your project specifies particular impact, hardness, or NDT requirements, confirm them with our engineers before ordering.
Production Process: HFI Welding
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Uncoiling and flattening of the steel strip.
Continuous forming of the strip into a cylinder.
HFI welding: high-frequency induction heats the strip edges, and pressure rollers forge them together without filler metal.
Weld-seam heat treatment: the seam is normalized so its grain structure and mechanical properties match the base metal, preventing "hook cracks."
Sizing and cutting to SRL or DRL length.
Quality Testing
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100% hydrostatic testing of every joint (test pressure per API 5L requirements).
Online ultrasonic testing (UT) of the full weld seam length.
Flattening and flare tests to verify weld integrity under deformation.
Eddy-current testing for surface and near-surface flaws.
Tensile, Charpy V-notch impact, and hardness testing per the ordered PSL level.
Third-party inspection by SGS, BV, Intertek, or your nominated agency is supported at our facility.
Verified by Global Experts: We support 100% Third-Party Inspection by SGS, BV, or Intertek at our facility. Join 100+ South American firms who trust our quality.
Surface Protection and Packaging
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Standard finish: black varnish coating; 3LPE or FBE coating available for buried service (applied before dispatch).
End protection: reinforced plastic or metallic bevel protectors to prevent damage during handling.
Bundling: small-bore pipes bundled in steel straps; large-bore pipes loaded with rubber-padded dunnage to protect coatings.
Shipping: container loading for fixed lengths, or breakbulk for large tonnage orders to South American ports including Santos, Callao, and Valparaiso.
Verified by Global Experts: We support 100% Third-Party Inspection by SGS, BV, or Intertek at our facility. Join 100+ South American firms who trust our quality.
API 5L Pipe MTC
FAQ
What is the difference between L415 and X60?
They are two designations of the same grade: L415 expresses the minimum yield strength in MPa (415 MPa), while X60 expresses it in ksi (60 ksi ≈ 415 MPa). Both appear in API 5L.
What is the difference between PSL1 and PSL2 for L415?
PSL2 imposes tighter composition limits (S ≤ 0.015%, P ≤ 0.025%), mandatory Charpy impact testing, a maximum yield-to-tensile ratio of 0.93, and 100% UT of the weld seam. PSL1 has looser chemistry and no impact testing requirement. For critical or low-temperature service, PSL2 is the standard choice.
What delivery conditions are available for L415?
L415 is supplied in three delivery conditions: L415M (TMCP, C ≤ 0.12%), L415N (normalized, C ≤ 0.24%), or L415Q (quenched and tempered, C ≤ 0.18%). The M/N/Q suffix must be specified on the purchase order per API 5L 46th Edition.
What is the Charpy impact requirement for L415 PSL2?
Charpy V-notch impact testing is mandatory for PSL2 at the temperature specified in the order - commonly 0 °C or −20 °C. The required energy depends on the pipe diameter and wall thickness per API 5L. State your required test temperature when inquiring.
Can you supply with third-party inspection?
Yes. We support inspection by SGS, BV, Intertek, or your nominated agency, and full mill test certificates are provided with every shipment.
References
- API Specification 5L - Specification for Line Pipe (PSL1 / PSL2).
- GB/T 9711 - Petroleum and natural gas industries: Steel pipe for pipeline transportation systems (Chinese equivalent of API 5L).
- ASME B36.10M - Welded and Seamless Wrought Steel Pipe (schedule and dimension basis).
- GNEE Pipe - API 5L product range (https://www.chinacarbonpipe.com/api-5l-seamless-steel-pipe/).
Request a Quotation
Send your grade (L415 / X60), PSL level, size, wall thickness, length, coating and quantity to sales@gneetube.com or use the Inquiry form. Our engineers will confirm specifications and delivery within 24 hours.
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