Tianjin Brisk Steel is one of the manufacturers of API 5L X70 PSL2 LSAW Steel Pipes in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
PRODUCT
Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe
The Science of X70 PSL2 Steel
For pipeline engineers and procurement officers, specifying the correct metallurgical configuration is critical. Here is the technical breakdown of the API 5L X70 PSL2 designation:
- High-Yield Strength Matrix (Grade X70): This standard guarantees a minimum yield strength of 485 MPa (70,300 psi) and a minimum tensile strength of 570 MPa. This elevated strength profile enables pipeline designers to utilize thinner wall profiles, significantly reducing total steel tonnage and reducing project logistics and material acquisition costs.
- Product Specification Level 2 (PSL2) Compliance: PSL2 enforces mandatory quality thresholds that standard PSL1 pipes do not meet. This includes strict maximum limits on carbon equivalents for superior weldability, mandatory Charpy V-notch fracture toughness testing for every heat lot, and full-body non-destructive testing (NDT) tracking.
- LSAW Structural Integrity: Longitudinal Submerged Arc Welding utilizes a straight longitudinal seam formed from a single high-grade steel plate. Because the weld line undergoes minimal residual stress during forming and is completely straight, it can be inspected with extreme precision via automated ultrasonic scanning.
Key Performance Advantages
1. Exceptional Low-Temperature Fracture Toughness
Our X70 PSL2 pipes undergo stringent low-temperature Charpy V-notch impact testing (typically verified down to -20°C or -30°C). This ensures the steel maintains high ductility and stops rapid brittle crack propagation, which is vital for pipelines operating in arctic or sub-zero climates.
2. Formulated for Sour Service (H2S Resistance)
For pipelines transporting sour oil or natural gas containing high hydrogen sulfide content, we supply specialized X70 PSL2 variants. These undergo comprehensive Hydrogen-Induced Cracking (HIC) and Sulfide Stress Corrosion Cracking (SSCC) laboratory testing to prevent structural blistering and internal stress failures.
3. Full-Length Cold Expansion for Flawless On-Site Fit-up
Following automated welding, every pipe undergoes full-length mechanical cold expansion. This critical process refines the pipe's straightness, completely neutralizes residual internal stresses from forming, and guarantees tight roundness and outer diameter (OD) tolerances-slashing joint fit-up times for field welding crews.
Technical Specifications & Size Portfolio
We supply and export certified API 5L X70 PSL2 LSAW pipes customized to standard international pipeline codes:
| Parameter | Specifications & Capabilities |
| Standard Compliance | API Spec 5L (46th Edition), ISO 3183 |
| Manufacturing Class | PSL 2 (Standard, Offshore, or Sour Service) |
| Outer Diameter (OD) | 16" to 60" (406.4mm – 1524mm) |
| Wall Thickness (WT) | Up to 50.0mm (Custom heavy-wall configurations available) |
| Steel Processing Type | Thermo-Mechanically Controlled Processing (TMCP) |
| End Configuration | Factory Beveled Ends (30° - 35° with root face) |
| External Protective Barriers | Bare, Black Varnish, FBE, Dual-layer FBE, 3LPE, 3LPP |
Frequently Asked Questions (FAQ)
Q: What is the significance of TMCP steel plates in your X70 PSL2 pipe production?
A: TMCP (Thermo-Mechanically Controlled Processing) is an advanced micro-alloying and heat-treatment method used during plate rolling. It allows us to achieve high mechanical strength (485 MPa yield) while maintaining a exceptionally low carbon content. For your field contractors, this means the pipe has an incredibly low Carbon Equivalent (CEV), offering excellent weldability and requiring minimal or no pre-heating on-site despite its high strength.
Q: How does your mill execute the "Drop Weight Tear Test" (DWTT) mandated for X70 PSL2 gas pipes?
A: The Drop Weight Tear Test (DWTT) is performed according to API 5L requirements to evaluate the ductile fracture propagation behavior of high-strength gas line pipes. We test full-thickness notched specimens in our lab by impacting them at specified project design temperatures. To pass PSL2 compliance, the fracture surface must exhibit a minimum percentage of ductile shear area, ensuring the pipeline will naturally arrest a running fracture during a high-pressure gas decompression event.
Q: What specific non-destructive testing (NDT) protocols are applied to the X70 PSL2 weld seam before export?
A: Our quality control involves a multi-stage, automated NDT regimen. The entire length of the longitudinal weld seam undergoes continuous automated Ultrasonic Testing (UT) immediately after welding and again after hydrostatic testing. Additionally, the pipe ends and any areas indicating potential anomalies are subjected to high-definition Radiographic Testing (RT/X-ray) and Magnetic Particle Inspection (MPI) to ensure absolute weld line integrity.
Q: Can your mill manage complex multi-grade shipping bundles and coordinate direct shipment to remote laydown yards?
A: Yes, absolutely. We have extensive experience managing complex global logistics for EPC mega-projects. We provide customized pipe bundling, color-coded grade identification stenciling, and heavy-duty, seaworthy end-fixings to protect roundness. We coordinate with major break-bulk and container shipping lines to deliver directly to your designated port or localized inland distribution yards under standard Incoterms (FOB, CFR, CIF, DDP).
Partner with a Certified Global Steel Supplier
Streamline your energy pipeline procurement timeline with fully certified, high-yield materials and robust international logistics. Contact our technical sales division today to review raw plate inventory logs, verify custom thickness configurations, or receive a competitive project quotation tailored directly to your destination port.
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