API 5L X60 Straight Seam Submerged Arc Welded Pipe
Product introduction
The main manufacturing processes for API 5L X60 welded pipes include LSAW and SAWH. Straight seam submerged arc welded pipe (LSAW) is one of the most common manufacturing forms of API 5L X60, especially suitable for large-diameter, high-pressure trunk lines. Spiral submerged arc welded pipe (SAWH) can also produce API 5L X60 grade steel pipes and is commonly used for large-diameter water and gas transmission, as well as structural support.
Parameter Information Table
API 5L X60 is divided into two quality grades, PSL1 and PSL2. Modern major oil and gas pipeline projects generally require PSL2.
| Element | C | Mn | P | S | CE (IIW) | CE (Pcm) |
|---|---|---|---|---|---|---|
| Content | ≤ 0.12 | ≤ 1.60 | ≤ 0.025 | ≤ 0.015 | ≤ 0.43 | ≤ 0.25 |
Carbon equivalent control: Strict carbon equivalent requirements are to ensure the excellent weldability of the steel pipe and the performance of the weld heat-affected zone, and to avoid cold cracking.
Quality inspection and testing
To ensure product quality, every API 5L X60 welded pipe undergoes the following inspections: chemical composition analysis to ensure raw materials meet standards; mechanical property testing, including tensile, impact, and hardness tests; hydrostatic testing, with each pipe undergoing a hydrostatic test at a pressure not less than 95% of the specified minimum yield strength; and finally, non-destructive testing, with the pipe body undergoing 100% ultrasonic testing and the weld seam undergoing 100% ultrasonic or 100% radiographic testing.
End Treatment and Surface Finishing
End treatment of API 5L X60 welded pipes is a crucial process for ensuring the quality and efficiency of circumferential welded connections. For precision machining using a beveling machine, the core focus is on creating geometric dimensions that fully comply with welding procedure specifications, including bevel angles, blunt edge height, and internal and external chamfers. All dimensional tolerances and surface quality must meet standard specifications to ensure high-efficiency, high-quality welding on-site.
Surface treatment of API 5L X60 welded pipes primarily serves two functions: corrosion protection and product identification. For corrosion protection, the outer surface of the pipe is shot-blasted or shot-polished to achieve near-white or metallic-grade cleanliness and anchor pattern depth, providing an ideal substrate for subsequent epoxy (such as FBE) or composite (such as 3LPE) anti-corrosion coatings, ensuring coating adhesion and long-term protective performance. The inner wall of the pipe may be coated with an internal coating, depending on the requirements of the transported medium, to reduce flow resistance and prevent internal corrosion.
About us
GNEE Steel Group is committed to exporting high-quality, competitively priced oil and gas pipeline products. As an agent for leading domestic steel mills, we ensure that the steel pipes meet international standards and strictly adhere to these standards in providing steel pipes and fittings. We offer one-stop service to solve our customers' logistics problems.
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