API 5L X42 Seamless and ERW Pipe description
X42 steel pipe, also known as L290 line pipe, is a low-carbon microalloyed steel pipe compliant with API SPEC 5L standard. Manufactured through Mn-Mo-Nb-Ti microalloying design and controlled rolling/cooling processes, it achieves a minimum yield strength of 290MPa (42ksi), hence the name "X42" derived from its yield strength grade. This material offers excellent weldability and resistance to hydrogen-induced cracking (HIC), while maintaining stable impact toughness even in -20°C low-temperature environments, making it an economical and reliable choice for industrial pipeline transportation.
API 5L X42 steel line pipe specification
Chemical Composition
PSL2 grade improves corrosion resistance by reducing carbon content (minimum 0.18%) and strictly controlling sulfur and phosphorus (both ≤0.015%), while adding Nb and Ti to refine grain structure and enhance toughness. The carbon equivalent index directly affects weldability, ensuring on-site pipeline welding quality.
Yield strength and Tensile strength
The yield strength of 290 MPa can withstand high-pressure transportation conditions, and the impact toughness at -20°C ensures pipeline safety in cold regions. PSL2 grade is divided into delivery conditions such as R (rolled) and N (normalized) to meet the anti-deformation requirements of different geological environments.
IMPACT TEST OF API 5L X42 Line Pipe
