X42 seamless steel pipe, also known as L290 line pipe, is a low-carbon microalloy steel compliant with API SPEC 5L. It is manufactured through Mn-Mo-Nb-Ti microalloying design and controlled rolling/ cooling processes, achieving a minimum yield strength of 290 MPa (42 ksi)-hence its designation as "X42" based on the yield strength grade.
This material combines excellent weldability with hydrogen-induced cracking (HIC) resistance, maintaining stable impact toughness even at -20°C. It serves as an industrial transport steel that balances cost-effectiveness and reliability.
Specification
|
Size |
Size Range |
Tolerance |
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|
OD |
10-219mm |
-0.035 -- +0.045mm |
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|
ID |
8-139mm |
±0.035mm |
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|
WT |
1-40mm |
depends on sizes | ||
|
Length |
random or fixed length |
+0-3.5mm |
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|
Straightness |
0.15:1000, 0.4:1000, 0.5:1000 1:1000 or customized |
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|
Surface Roughness |
Ra 0.02-0.4μm |
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| Final supply conditions | ||
| Designation | Symbol | Description |
| Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
| Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
| Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
GNEE API 5L X42 Line pipe for sale
