The API 5L X42 PSL1 welded steel pipe, as a basic grade product under the American Petroleum Institute (API) standard, demonstrates outstanding efficiency and durability in energy transmission. The API 5L X42 PSL1 welded pipe employs the High-Frequency Electric Resistance Welding (ERW) process, utilizing a 150-400 kHz high-frequency current to achieve instantaneous metal fusion. It is equipped with a dual monitoring system of online eddy current testing and ultrasonic flaw detection, achieving a defect detection rate of up to 99.97%, ensuring stable weld quality.
Chemical Composition of API 5L X42 PSL1 PSL2 Pipe
| Mass fraction, based upon heat and product analysis a | ||||||
| WELDED PIPE | ||||||
| 0.26 | 1.20 | 0.030 | 0.030 | c,d | c,d | d |
Mechanical Property of Carbon Steel API 5L X42 PSL1 PSL2 Pipe
| Y.S | T.S | ELONGATION |
| Mpa(psi) | Mpa(psi) | |
| min | min | min |
| 245(35 500) | 415(60 200) | 28 percent |
production process of API 5L X42 welded line pipe
The production process of API 5L X42 longitudinal submerged arc welded (LSAW) pipe includes key stages such as steel plate pre-treatment, forming, welding, expanding, and inspection. Compared to seamless steel pipes, LSAW pipes can achieve larger diameters (typically up to 1422mm) and thicker wall thicknesses (exceeding 30mm) by using wider steel plates.
Forming Technology: JCOE (J-C-O-E) or UOE (U-ing O-ing Expanding) processes are employed to ensure precise geometric dimensions of the pipe body.
Welding Process: Multi-wire submerged arc welding (SAW) is commonly used, with configurations of 3-4 wires for internal welding and 2-3 wires for external welding. This setup can increase welding speed to over 1.5 meters per minute while ensuring weld penetration and crack resistance.
Post-Weld Treatment: Mechanical expanding (with an expansion rate of approximately 1.2%) is performed to eliminate residual stress, and online heat treatment is applied to improve the metallographic structure of the weld zone.
Test and inspection
Packaging and shipping
