API 5L PSL1 Grade B ERW Pipe
API 5L PSL1 Grade B ERW Pipe - Carbon Steel Line Pipe for Low-Pressure Transmission Systems
Comprehensive material data for API 5L PSL1 Grade B electric resistance welded (ERW) pipe, including chemical composition, mechanical and physical properties, international equivalents, and application details.
Electric Resistance Welding (ERW); forming, welding, sizing, cutting, optional heat treatment
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
API 5L PSL1 Grade B ERW Pipe Introduction
API 5L PSL1 Grade B is a carbon steel line pipe grade specified under the API Specification 5L for pipeline transportation systems in the petroleum and natural gas industries. The pipe is manufactured by electric resistance welding (ERW) and belongs to Product Specification Level 1 (PSL1), which imposes basic requirements without additional restrictions on chemistry or mechanical testing.
Typical applications include low-pressure oil, gas and water conveyance, as well as structural usage. Grade B offers a good balance between strength and weldability, with a minimum yield strength of 241 MPa (35 ksi) and minimum tensile strength of 414 MPa (60 ksi). The ERW process ensures consistent wall thickness and a smooth surface finish. The material is generally delivered in the as-welded condition, although stress-relief annealed or normalized forms may be available for specific requirements.
API 5L PSL1 Grade B ERW Pipe Chemical Composition
The chemical composition for API 5L PSL1 Grade B pipe is limited to the four elements listed below as per the standard. Other elements (e.g., V, Nb, Ti) may be present but are not specified for PSL1. For welded pipe, both base metal and weld metal must comply. All values are maximum unless indicated otherwise.
| Element | Standard Value (Max) | Remarks |
|---|---|---|
| Carbon (C) | 0.28% | For heat analysis; product analysis max 0.30% |
| Manganese (Mn) | 1.20% | For heat analysis; product analysis max 1.25% |
| Phosphorus (P) | 0.030% | For heat analysis; product analysis max 0.035% |
| Sulfur (S) | 0.030% | For heat analysis; product analysis max 0.035% |
| Others (V, Nb, Ti) | Not specified | PSL1 places no maximum limits on microalloying elements |
API 5L PSL1 Grade B ERW Pipe Thermal and Electrical Physical Properties
Physical properties are typical for carbon steel of this grade and are not mandated by API 5L standard. Values are provided for general engineering calculations. Actual values may vary slightly depending on exact composition and heat treatment.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 205 | GPa | At 20 °C |
| Shear Modulus (G) | 79.3 | GPa | Estimated from E and ν = 0.3 |
| Poisson's Ratio (ν) | 0.30 | — | Within elastic range |
| Thermal Expansion (α) | 11.7 | 10-6/K | Average from 20 °C to 100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20 °C; typical for low-carbon steel |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.143 | μΩ·m | At 20 °C; typical for low-carbon steel |
API 5L PSL1 Grade B ERW Pipe Mechanical Properties
Mechanical properties are determined on the pipe body (base metal) according to API 5L. The values below comply with PSL1 requirements. Elongation is calculated using the standard API 5L formula; a typical example is given for a standard rectangular tension test specimen (38.1 mm wide) taken transverse to the weld. Bending tests are performed as per ASTM A370 or equivalent.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 241 | MPa (35 ksi) | Tensile test, 0.5% total extension under load; transverse specimen |
| Tensile Strength (Rm) | ≥ 414 | MPa (60 ksi) | Tensile test, transverse specimen |
| Elongation (A) | ≥ 22 (typical) | % | 50 mm gage length, transverse rectangular specimen; calculated per API 5L Table 8 formula: e = 1940·A0.2/Rm0.9, where A = specimen cross-sectional area. Value shown is for approx. 8 mm wall thickness. |
| Bend Test (mandrel diameter) | 180° bend around mandrel with diameter = 3 × pipe OD | — | No cracks or openings in the weld or base metal after bending |
API 5L PSL1 Grade B ERW Pipe Exact Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International (ISO) | ISO 3183 | L245 | Mechanical and chemical equivalent to API 5L Grade B, PSL1 |
| USA / International | ASTM A53 | Grade B | Seamless and welded pipe; chemistry and tensile properties align closely |
| Europe | EN 10208-1 | L245GA | Steel pipes for onshore pipelines; equivalent strength and composition |
| China | GB/T 9711 | L245 | China National Standard for line pipe, directly corresponds to API 5L Grade B |
| Japan | JIS G3452 | SGP (when supplementary requirements applied) | Similar carbon steel pipe for pressure service; not a full equivalent without modification |
API 5L PSL1 Grade B ERW Pipe Application Introduction
API 5L PSL1 Grade B ERW pipe is primarily used in low-pressure fluid transmission and structural applications. Its balanced mechanical properties and good weldability make it suitable for a wide range of industries. The pipe can be readily cut, bent, threaded, and welded to fabricate various system components.
Product Applications: Line pipe for natural gas and crude oil gathering networks, Water mains and service pipes, Casing and tubing for shallow wells, Structural steel pipe for buildings, bridges, and sign supports, Pipeline repair sleeves and temporary jumpers
Processed into products: Pipe bends and elbows (manufactured by cold or hot induction bending), Tees and reducers (fabricated by welding), Flanges (slip-on, weld neck) made from companion pipe or forged to matching strength, Pipe couplings and threaded adapters, Steel pipe piles and casing spacers, Handrail and guardrail posts, Roller and conveyor tubes in material-handling equipment
Application industries: Oil & Gas (upstream, gathering lines, low-pressure transmission), Water Supply and Distribution, Structural and Civil Engineering (piling, columns, bracing), Chemical and Petrochemical (low-corrosive media transport), Fire Protection (sprinkler mains)
API 5L PSL1 Grade B ERW Pipe Similar / Alternate Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | API 5L PSL2 | Grade B | Higher quality level (PSL2) with tighter controls on chemistry, mechanicals, and additional testing; suitable replacement when enhanced toughness or weldability is needed. |
| International | API 5L | X42 (L290) | Higher strength grade with minimum YS 290 MPa, often used in slightly higher pressure applications; provides improved strength-to-weight ratio. |
| USA | ASTM A106 | Grade B | Seamless carbon steel pipe for high-temperature service; similar strength but designed for elevated temperature applications. |
| Europe | EN 10217-1 | P235TR1 | Welded steel tubes for pressure purposes; suitable for similar pressure ratings but differs in some chemical limits. |
Notes:
API 5L PSL1 Grade B ERW pipe is supplied with hydrostatic testing or nondestructive inspection of the weld seam according to the standard. The pipe ends are normally plain or beveled for welding.
When ordering, it is essential to specify outside diameter, wall thickness, length, and end finish. Additional requirements such as weld seam heat treatment, coating, or specific carbon equivalent limits (CEV) should be agreed upon at the time of inquiry and purchase.
All supplied pipes are marked with the manufacturer's name, API monogram (if licensed), grade, specification, and size.
- Share
