L245 ERW Line Pipe Material Properties per GB/T 9711
L245 ERW Line Pipe Material Properties per GB/T 9711-2011 PSL2
Complete chemical composition, mechanical and thermal properties of L245 PSL2 ERW steel pipe under GB/T 9711-2011. Includes international equivalents, similar materials, and application guidance.
Electric resistance welding (ERW), cold forming, hot-rolled strip
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L245 ERW Line Pipe Material Properties per GB/T 9711 Introduction
L245 is a pipeline steel grade defined in GB/T 9711-2011 (equivalent to ISO 3183:2007), corresponding to API 5L Grade B. It is typically supplied as electric resistance welded (ERW) pipe for the transportation of oil, gas and water at moderate pressures.
- Minimum yield strength: 245 MPa
- Good weldability and toughness
- PSL2 designation ensures stricter chemical limits and mandatory impact testing
The material exhibits balanced strength and ductility, suitable for various pipeline projects. Delivery condition is as-welded, often under hydrostatic test. Both ends may be plain, bevelled or threaded.
L245 ERW Line Pipe Material Properties per GB/T 9711 Chemical Composition
Limits for the base metal of L245 PSL2 ERW pipe according to GB/T 9711-2011 Table 3. Silicon is not a mandatory element for welded pipe but may be agreed upon. Carbon equivalent (CE) is controlled to ensure weldability.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.22 | Maximum |
| Si | ≤ 0.45 | If agreed for welded pipe; otherwise not specified |
| Mn | ≤ 1.20 | Maximum |
| P | ≤ 0.025 | Maximum |
| S | ≤ 0.015 | Maximum |
| V | ≤ 0.05 | Maximum |
| Nb | ≤ 0.05 | Maximum |
| Ti | ≤ 0.04 | Maximum |
| V+Nb+Ti | ≤ 0.15 | Sum of micro-alloying elements |
| CE(IIW) | ≤ 0.43 | Carbon equivalent for C content ≤ 0.12%; otherwise Pcm may apply |
L245 ERW Line Pipe Material Properties per GB/T 9711 Thermal and Electrical Physical Properties
These are generic values for low-carbon steel similar to L245. They are not standardised requirements but are useful for design calculations. Values can vary slightly with composition and temperature. Density, modulus and thermal expansion are room‑temperature to moderate‑temperature ranges.
| Property | Typical Value | Unit | Condition / Note |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 205 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | Approximate |
| Poisson's Ratio (ν) | 0.29 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 | ×10⁻⁶ /K | 20 – 100 °C |
| Thermal Conductivity (λ) | 51 | W/(m·K) | At 100 °C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At room temperature |
| Electrical Resistivity (ρₑ) | 0.15 | µΩ·m | At 20 °C |
L245 ERW Line Pipe Material Properties per GB/T 9711 Mechanical Properties
Mechanical requirements for the pipe body of L245 PSL2 ERW pipe (transverse strip specimens) per GB/T 9711-2011. Elongation values depend on specimen dimensions; the value given is typical for thickness ≤12.7 mm with a 50 mm gauge length. Charpy impact test is mandatory at 0°C unless otherwise specified.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 245 – 450 | MPa | Transverse strip, pipe body base metal |
| Tensile Strength (Rm) | 415 – 760 | MPa | Transverse strip, pipe body base metal |
| Elongation after fracture (A) | ≥ 22 (typical) | % | Strip specimen, 50 mm gauge length, area >475 mm², thickness ≤12.7 mm |
| Charpy Impact Energy (KV₂) | Average ≥ 27; Single ≥ 20 | J | at 0 °C, full-size 10×10 mm specimen, transverse |
L245 ERW Line Pipe Material Properties per GB/T 9711 Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 9711-2011 | L245 | PSL2 ERW line pipe |
| International | ISO 3183:2007 | L245 | PSL2 |
| USA | API 5L 45th Ed. | Grade B (L245) | PSL2, welded |
| Europe | EN 10208-2:2009 | L245 | Class II, similar to PSL2 |
| Japan | JIS G 3445 | STKM 11A | Approximate equivalent, verify mechanicals |
| Russia | GOST 20295 | K42 | Similar strength level |
L245 ERW Line Pipe Material Properties per GB/T 9711 Application Introduction
L245 ERW pipe is a workhorse for fluid transportation systems. Its balanced mechanical properties and cost-effectiveness make it the first choice for many onshore pipeline projects.
- Excellent field weldability
- Adequate toughness for cold climates (when impact tested)
- Compatible with standard coating and lining systems
Product Applications: Buried oil gathering lines, Gas distribution networks, Water mains, Structural pipe piles
Processed into products: Line pipe sections, Induction bends and elbows, Tee fittings, Flanges and connectors, Flowlines and risers, Casing pipes
Application industries: Oil & Gas, Petrochemical, Water Supply & Drainage, Civil Engineering & Construction
L245 ERW Line Pipe Material Properties per GB/T 9711 Similar / Alternative Materials for Comparison
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 9711-2011 | L245 PSL1 | Lower toughness requirements, no mandatory Charpy |
| China | GB/T 9711-2011 | L290 / X42 | Higher yield strength (290 MPa), suitable for higher pressures |
| International | ISO 3183 | L290 PSL2 | Higher strength grade |
| USA | API 5L | Grade B PSL1 | Less stringent composition and no mandatory impact test |
Notes:
Supplementary requirements often applied under GB/T 9711-2011 PSL2 include:
- Non-destructive testing (NDT) of the weld seam (ultrasonic or radiographic)
- Charpy impact testing at lower temperatures (e.g., -10 °C) as per project specifications
- Hydrostatic pressure test to a defined hold pressure and time
- Special end finishes (bevel, thread, cut‑square)
- Corrosion protection coatings (3‑layer PE, FBE, etc.)
Dimensional tolerances follow the standard or customer's purchase order. Pipe is typically marked with the manufacturer's identity, grade, size, and heat number for traceability.
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