API 5L X46 Straight Seam Welded Pipe
Product introduction
The following table outlines the basic product parameters for API 5L X46 pipes:
| Grade | Type | Wall Thickness | OD Range | Length | PSL Level |
|---|---|---|---|---|---|
| X46 | Seamless/Welded | SCH 10 to 160 | 1/2" – 48" | 6m – 12m | PSL1 / PSL2 |
API 5L X46 straight seam submerged arc welded pipe combines pressure resistance and formability, making it particularly suitable for onshore oil and gas gathering and transmission pipelines and urban gas distribution systems under medium pressure conditions. Its end treatment requires a smooth machined surface and removal of burrs. To ensure weld quality, the pipe ends should have a smooth, undamaged bevel surface, typically delivered in bevel form. The bevel angle and blunt edge dimensions must conform to relevant standards or order agreements to facilitate on-site butt welding.
Chemical Composition for X46 PSL 1 pipe
| Steel Grade | Mass fraction, % based on heat and product analyses a,g | ||||||
|---|---|---|---|---|---|---|---|
| C | Mn | P | S | V | Nb | Ti | |
| max | max | max | max | max | max | max | |
| Seamless Pipe | |||||||
| X46 | 0.28 | 1.4 | 0.3 | 0.3 | d | d | d |
| Welded Pipe | |||||||
| X46 | 0.26 | 1.4 | 0.3 | 0.3 | d | d | d |
| d. Nb + V + TI ≤ 0.15%, | |||||||
Heat Treatment Process
The typical heat treatment process for API 5L X46 straight seam welded pipe is partial normalizing of the weld or normalizing of the entire pipe body. The core step is to heat the welded steel pipe to a suitable temperature above the Ac3 phase transformation point (typically 900°C ± 25°C), causing the microstructure of the weld and heat-affected zone to revert to homogeneous austenite, followed by uniform cooling in still air.
This process aims to completely eliminate residual welding stress and refine and homogenize the microstructure of the weld area, thereby restoring and improving its mechanical properties, ensuring its toughness meets PSL2 level requirements, and maintaining consistent performance throughout the pipe body. Necessary straightening and hydrostatic testing are required after treatment.
About our company
GNEE Steel Group is a supply chain group that provides one-stop services. The group was established in 2008 and has 18 years of export experience. We collaborate with clients in numerous countries to ensure the successful execution of their projects. We are responsible for all business processes from procurement to transportation to ensure the successful implementation of the project.
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