GB/T 9711-2011 PSL2 L415 SSAW Pipe
GB/T 9711-2011 PSL2 L415 SSAW Pipe: Complete Material Data
Detailed data sheet for GB/T 9711-2011 PSL2 L415 spiral submerged arc welded (SSAW) steel pipe, covering chemical composition, mechanical properties, thermal properties, equivalent grades, and application guidance.
Hot-rolled skelp/plate, spiral forming, double submerged arc welding (inside and outside), and mechanical expanding; optional normalizing or TMCP rolling for the base material
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GB/T 9711-2011 PSL2 L415 SSAW Pipe Introduction
GB/T 9711-2011 L415 PSL2 is a low-carbon microalloyed steel grade for line pipes used in oil and gas transmission. Equivalent to API 5L X60 PSL2 and ISO 3183 L415, it is produced as spiral submerged arc welded (SSAW) pipes. Under PSL2 (Product Specification Level 2), the steel offers stricter chemical limits, mandatory Charpy impact tests, and enhanced toughness compared to PSL1. Typical delivery condition is as-rolled, normalized, or thermomechanically rolled, ensuring a fine-grained microstructure with balanced strength and weldability. This grade is widely adopted for high-pressure onshore and offshore pipelines.
GB/T 9711-2011 PSL2 L415 SSAW Pipe Chemical Composition
Chemical requirements according to GB/T 9711-2011 Table 4 for PSL2 L415 welded pipe (SAW). Limits are based on heat (ladle) analysis. Carbon equivalent CE(Pcm) is mandatory for PSL2 and shall not exceed 0.25%. Elements not listed are subject to agreement between purchaser and manufacturer.
| Element | Max. or Range (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.22 | heat analysis |
| Mn | ≤ 1.40 | heat analysis |
| P | ≤ 0.025 | heat analysis |
| S | ≤ 0.015 | heat analysis |
| V | ≤ 0.10 | heat analysis |
| Nb | ≤ 0.05 | heat analysis |
| Ti | ≤ 0.04 | heat analysis |
| V+Nb+Ti | ≤ 0.15 | sum of microalloying elements |
| Cu | ≤ 0.50 | residual element |
| Ni | ≤ 0.50 | residual element |
| Cr | ≤ 0.50 | residual element |
| Mo | ≤ 0.50 | residual element |
| Al (total) | ≤ 0.060 | total aluminum |
| N | ≤ 0.012 | nitrogen content |
| B | ≤ 0.0005 | if intentionally added |
| CE(Pcm) | ≤ 0.25 | Pcm = C + Si/30 + (Mn+Cu+Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B, PSL2 mandatory |
GB/T 9711-2011 PSL2 L415 SSAW Pipe Thermal and Electrical Physical Properties
The following values are typical for low-carbon microalloyed steel and are not mandatory requirements of GB/T 9711-2011. They provide useful engineering approximations for design and analysis. Actual properties may vary slightly depending on exact chemistry and processing route.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic modulus (E) | 200 – 210 | GPa | Room temperature |
| Shear modulus (G) | 80 – 84 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.29 – 0.30 | — | Room temperature |
| Thermal expansion coefficient (α) | 11.5 – 12.2 | 10⁻⁶ / K | 20 – 100 °C |
| Thermal conductivity (λ) | 45 – 55 | W/(m·K) | Room temperature |
| Specific heat capacity (cp) | 460 – 500 | J/(kg·K) | Room temperature |
| Electrical resistivity (ρe) | 0.20 – 0.25 | µΩ·m | Room temperature |
GB/T 9711-2011 PSL2 L415 SSAW Pipe Mechanical Properties
Tensile and toughness requirements per GB/T 9711-2011 for L415 PSL2 SSAW pipe. Testing is performed on full-thickness transverse strip specimens (base metal) unless otherwise agreed. Elongation is calculated by formula Af = 1944 Axc0.2 / U0.9 where Axc is the cross-sectional area of the tensile test specimen (mm²) and U is the specified minimum tensile strength (MPa). Charpy V-notch tests are mandatory for PSL2 at 0 °C (or as agreed), using full-size transverse specimens.
| Property | Specified Value | Unit | Condition |
|---|---|---|---|
| Yield strength (ReH or Rt0.5) | 415 – 565 | MPa | Transverse, room temperature |
| Tensile strength (Rm) | 520 – 760 | MPa | Transverse, room temperature |
| Yield/Tensile ratio | ≤ 0.93 (if specified by agreement) | — | PSL2, optional requirement |
| Elongation Af (50.8 mm gauge) | Calculated (Af = 1944 Axc0.2 / U0.9) | % | Transverse strip specimen |
| Bend test | No cracks; bend angle 180° | — | Bend radius: 3t (t ≤ 12.7 mm) ; 4t (t > 12.7 mm) |
| Charpy impact energy (KV) | Average ≥ 27 J; Single ≥ 21 J | J | Full size, transverse, 0 °C (PSL2) |
GB/T 9711-2011 PSL2 L415 SSAW Pipe Fully Equivalent Material Standards and Replacement Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 9711-2011 | L415 PSL2 | Identical original standard |
| USA | API 5L (45th Ed. or later) | X60 PSL2 | Technically equivalent; API 5L is the parent specification |
| International | ISO 3183:2012 | L415 PSL2 | Harmonized with GB/T 9711-2011 |
| Europe | EN 10208-2 | L415MB | Equivalent for onshore/offshore natural gas pipelines |
| Russia/CIS | GOST R 52079 | К60 (K60) | Similar strength level, PSL-type requirements may differ |
| Canada | CSA Z245.1 | Grade 415 Cat II | Closely aligned; PSL2 corresponds to Category II or III |
GB/T 9711-2011 PSL2 L415 SSAW Pipe Application Introduction
L415 (X60) PSL2 SSAW pipe is primarily designed for high-pressure transportation of oil, natural gas, and other fluids. Its good combination of strength, toughness, and weldability makes it suitable for demanding environments, including sour service when properly qualified. Spiral welded construction allows large diameters and efficient manufacturing.
- Used extensively in onshore cross-country pipelines and offshore trunk lines.
- Also applied in water transmission, slurry pipelines, and structural tubulars like piling.
- Can be fabricated into bends, tees, reducers, and flanged spools for station piping.
Product Applications: Cross-country oil and gas pipelines, Subsea pipelines and risers, Flowlines and gathering lines, Water main transmission pipes, Pipe piling and jacket structures
Processed into products: Spiral welded straight pipes (12 m typical length), Induction bends (hot bends), Cold bends, Tees, concentric and eccentric reducers, Pipe ends for flanges and mechanical connectors, Pre-fabricated spools for compressor and pumping stations
Application industries: Oil and gas transmission, Petrochemical and refining, Water infrastructure, Offshore and marine engineering, Civil and structural construction
GB/T 9711-2011 PSL2 L415 SSAW Pipe Similar or Substitution Materials with Close Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 9711-2011 | L415 PSL1 | Lower toughness and NDE requirements, not full replacement for PSL2 |
| USA | API 5L | X60 PSL1 | Same strength range, but less stringent testing |
| International | ISO 3183 | L415 PSL1 | Similar strength, PSL1 level |
| Europe | EN 10208-2 | L360MB / L415MB | L360MB is a lower strength alternative; L415MB may be used under certain conditions |
| China | GB/T 9711-2011 | L450 (X65) | Higher strength grade, may be considered with design re-evaluation |
Notes:
Important notice: This data sheet summarizes the main requirements of GB/T 9711-2011 for L415 PSL2 SSAW pipe. It is intended for general reference only. Full compliance with the standard requires consideration of supplementary requirements (e.g., non-destructive testing, hydrogen-induced cracking tests, dimensional tolerances) which should be agreed upon at the time of enquiry and order. The thermal and electrical properties are typical values and not part of the standard. For critical applications, always refer to the latest official standard and consult the manufacturer's test certificates.
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