API 5L X46 PSL1 Seamless Line Pipe description
API 5L is the pipeline steel pipe standard established by the American Petroleum Institute (API), applicable to the transportation of fluids such as oil and natural gas. X46 is one of its steel grades, representing a minimum yield strength of 46,000 psi (approximately 317 MPa).
Balance Between Strength and Toughness: The X46 grade offers moderate yield strength, capable of withstanding internal pressure from transported fluids while providing excellent impact resistance, making it suitable for medium- and high-pressure pipeline systems.
Weldability: The steel composition is optimized to minimize crack formation during welding, facilitating on-site construction connections.
Corrosion Resistance: Coating or cathodic protection techniques can further enhance corrosion resistance, extending service life.
API 5L X46 PSL1 Pipeline specification
API 5l X46 Mechanical Properties
API 5l X46 Chemical Composition
Test Requirements:
Bend Test: No cracks should be occur in any part of the sample or opening of weld.
Flattening test: Flattening test used to prove the pipe performances under deformation. It shall show the resistance to longitudinal cracking and circumferential cracking, including internal and external defects.
It shall be perfored to ERW pipes which diameters above 12.75 inch;
For pipes OD/WT > 10, there shall be no opening of the weld before the distance between the plates is less than 30% of the original OD.
Guided-bend test: Fracture completely; Reveal any cracks or ruptures in the weld metal longer than 3.2 mm, regardless of depth. Or reveal in parent metal, HAZ or fusion line longer than 3.2mm or deeper than 12.5% of wall thickness.
Hydrostatic Test: 100% hydrostatic test without leakage through the weld seam or the pipe body required. Connections or joints not need hydrostatic test if the pipe sections used were successfully tested.
CVN impact test: (Required PSL2 pipe, for seamless shall be tested with pipe body, for welded tests including pipe body, weld seam and heat-affected zon HAZ tests) Normally impact test temperature 0 ℃.
DWT test: (Required for PSL2 pipe)
