API 5L Gr.B PSL1 LSAW Steel Pipe

API 5L Gr.B PSL1 LSAW steel pipe is manufactured in accordance with API 5L / ISO 3183 international standards, equivalent to Chinese standard L245 carbon steel. The pipe is produced using JCOE forming technology followed by LSAW (Longitudinal Submerged Arc Welding), with double‑sided submerged arc welding applied to both the internal and external weld passes. It is available in large diameter, heavy wall thickness, and custom lengths.

The finished product features high dimensional accuracy, strict tolerance control, uniform metallographic structure, and strong structural stability. It fully complies with the construction and acceptance standards of large and medium‑sized pipeline projects worldwide.

All products undergo standardized finishing. The external surface is coated with industrial anti‑corrosion protection. Permanent traceability markings are applied. The internal surface is smooth and free of impurities. Pipe ends are uniformly milled with standard welding bevels. All welds undergo dual non‑destructive testing. EN 10204 3.1 mill test certificates are available for each batch. Full quality traceability is ensured.

Note: This product is controlled to a maximum carbon content of ≤0.24%, which is stricter than the applicable API 5L PSL1 requirement.

Note: API 5L PSL1 specifies only the minimum values for yield strength and tensile strength; no maximum tensile strength is specified. If an upper tensile strength limit is required, the applicable range depends on the specified grade and must be confirmed in the purchase order. PSL2 execution can be supplied on request.

External Surface: Industrial‑grade black anti‑corrosion paint applied over the entire surface. The coating offers strong adhesion, wear resistance, oxidation resistance, and weather resistance, suitable for humid marine transport and long‑term outdoor storage. Permanent markings indicating specification, standard, and heat number are applied to the pipe body for full traceability.

Internal Surface: Bare uncoated finish as standard. The internal surface is smooth, free of burrs, scale, and residual impurities, resulting in low fluid resistance. Internal and external anti‑corrosion coatings are available on request for corrosive service conditions.

Pipe Ends: Both ends are precision‑milled to a 30–35° standard welding bevel. Bevel angles are uniform, faces are smooth, and no burrs are present. Each pipe is fitted with high‑strength plastic protective end caps to prevent dust, impact damage, and end deformation during storage and transport.

● International Standard Compliance: Manufactured strictly in accordance with API 5L / ISO 3183. JCOE forming process ensures uniform structure and high structural strength.

● Reliable Weld Quality: All welds are subjected to 100% Phased Array Ultrasonic Testing (PAUT) + Radiographic Testing (RT). This inspection regime is a factory internal tightened requirement, exceeding the mandatory NDT requirements of API 5L PSL1.

● Field‑Friendly Installation: Standardized bevel design ensures accurate alignment and efficient field welding.

● Excellent Storage and Transport Protection: Industrial anti‑corrosion external coating suitable for cross‑border marine shipment and long‑term outdoor storage.

● Complete Certification: EN 10204 3.1 Mill Test Certificate supplied, issued by the manufacturer‘s authorized inspection representative independent of the production department as defined under EN 10204. If third‑party validation is required, inspection by SGS, BV, or Intertek can be arranged, or EN 10204 3.2 certification can be applied for.

● Flexible Customization: Full customization available for dimensions, coating, pipe end treatment, and length. Minimum order quantity to be negotiated based on project requirements.

● Long‑distance oil and gas transmission pipelines

● Municipal water supply and wastewater treatment networks

● Industrial fluid and chemical medium transmission pipelines

● Hydropower, urban infrastructure, and industrial park piping systems

This product is custom‑manufactured. Standard production lead time is 60–70 days. Global shipping by bulk carrier or container is supported. Trade terms including FOB, CIF, and CFR are available. Priority scheduling can be arranged based on project timeline.

Q1: What is the core difference between PSL1 and PSL2 line pipe?

PSL1 is the basic API 5L grade. It specifies only minimum values for yield strength and tensile strength, meeting the basic performance requirements of conventional pipeline projects with high cost‑effectiveness. PSL2 is a higher grade with stricter requirements for carbon equivalent, low‑temperature impact toughness, and non‑destructive testing. PSL2 is typically used for high‑pressure, high‑risk oil and gas transmission. The specific strength range under PSL2 depends on the grade and product type, and must be confirmed in the purchase order. PSL2 can be supplied on request.

Q2: Are official material certificates provided?

All shipped products are supplied with EN 10204 3.1 Mill Test Certificates, including complete heat number, chemical composition, mechanical properties, and test data. The certificate is issued by the manufacturer’s authorized inspection representative as defined under EN 10204. If third‑party validation is required, inspection by SGS, BV, or Intertek can be arranged, or EN 10204 3.2 certification can be applied for.

Q3: How is weld quality guaranteed?

All LSAW pipe welds undergo 100% Phased Array Ultrasonic Testing (PAUT) + Radiographic Testing (RT). This inspection regime is a factory internal tightened requirement, exceeding the mandatory requirements of API 5L PSL1, and is performed in strict accordance with API 5L acceptance criteria to detect and eliminate welding defects.

Q4: Is customization supported? What is the minimum order quantity?

Minimum order quantity for large diameter LSAW pipe is negotiable based on project requirements. Flexible production scheduling is available. Full customization is supported for non‑standard diameter, wall thickness, length, coating, and pipe end treatment.