API 5L X42 PSL1&PSL2 carbon steel pipe description
API 5L X42 PSL1 PSL2 carbon steel pipes demonstrate outstanding efficiency and durability in energy transmission due to their balanced mechanical properties and optimized manufacturing processes. As a basic grade product under the American Petroleum Institute (API) standards, X42 achieves a yield strength of 290 MPa, with a tensile strength range of 415-655 MPa. Combined with the strict chemical composition control mandated by API 5L standards (carbon equivalent ≤0.25%), it maintains a Charpy impact energy of over 27 J even at -20°C, meeting the typical operational requirements for low- and medium-pressure natural gas transmission in Class II and III onshore regions.
API 5L X42 Seamless Line Pipe Specification
Chemical Composition of API 5L X42 PSL1 PSL2 Oil and Gas Carbon Seamless Steel Pipe
Mechanical Properties of API 5LX42 PSL1 PSL2 Seamless Line Pipe
API 5L Pipe Quality Inspection Standards:
Hydrostatic Test
The pipe shall be subjected to a hydrostatic test with no leakage in the weld or pipe body. If the pipe section used has successfully passed the test, the joint does not need to be hydrostatically tested.
Bend Test
No cracks shall be present in any part of the test piece and no openings shall be present in the weld.
Flattening Test
The acceptance criteria for the flattening test shall be:
EW Pipe D<12.750 inches:
X60, T 500 inches. The weld shall not open until the distance between the plates is less than 66% of the original outside diameter. For all grades and wall thicknesses, it is 50%.
For pipes with D/t > 10, the weld shall not open until the distance between the plates is less than 30% of the original outside diameter.
For other sizes, refer to the complete API 5L specification.
CVN Impact Test for PSL2
Many PSL2 pipe sizes and grades require CVN. Seamless pipe will be tested inside the pipe body. Welded pipe is tested on the pipe body, pipe welds, and heat affected zone. Refer to the full API 5L specification for sizes and grades and a chart of required absorbed energy values.
