Tianjin Brisk Steel is one of the manufacturers of API 5L X65 ERW Steel Pipe in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
PRODUCT
Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe
Product Specifications
| Parameter | Specification |
|---|---|
| Applicable Standard | API 5L (45th Edition), ISO 3183 |
| Steel Grade | X65, PSL2 recommended |
| Manufacturing Process | Electric Resistance Welded (HFI/ERW) |
| Minimum Yield Strength | 450 MPa (65,300 psi) |
| Minimum Tensile Strength | 535 MPa (77,600 psi) |
| Outer Diameter | 168.3 mm – 610 mm |
| Wall Thickness | 4.0 mm – 18 mm |
| Standard Length | 11.8 m / 12 m (double random typical for transmission) |
| End Finish | Beveled end (standard for field welding) |
| Coating Options | 3PE, FBE (most common for high-pressure buried lines) |
| Weld Seam Testing | 100% ultrasonic testing, mandatory for PSL2 |
| Impact Testing | Charpy V-notch, mandatory at low temperature per PSL2 |
| Certification | MTC per EN 10204 3.1 or 3.2 |
Applications
- High-pressure long-distance oil and gas transmission mainlines
- Offshore-to-onshore pipeline tie-ins
- Trunk pipelines where wall thickness reduction significantly affects project cost
- Pipeline replacement/uprating projects requiring higher pressure ratings within existing right-of-way constraints
Engineering Considerations at X65
At this strength level, weldability becomes a more active design consideration. Buyers should request carbon equivalent (CE) values and confirm the mill's field welding procedure qualification (WPQ/WPS) compatibility, since higher-strength steel requires tighter control of preheat and interpass temperature during field welding to avoid hydrogen-induced cracking. This is a meaningful difference from lower grades like X42 or X52, where field welding tolerances are comparatively forgiving.
Frequently Asked Questions (FAQ)
Q: Why choose X65 ERW over X65 SAW or seamless pipe?
A: For diameters within ERW manufacturing capability (up to roughly 24" OD, mill-dependent), ERW typically offers tighter dimensional tolerance and lower cost than SAW pipe of the same grade. For larger diameters or thicker walls beyond ERW capacity, SAW or seamless becomes the only practical option.
Q: Does X65 pipe require special field welding procedures?
A: Generally yes - higher carbon equivalent steel requires more carefully controlled preheat, interpass temperature, and sometimes low-hydrogen electrodes to avoid weld cracking. Confirm your contractor's WPS is qualified for the specific heat/CE range of the delivered pipe.
Q: What PSL level is required for X65?
A: While PSL1 exists on paper for X65, the vast majority of real-world specifications require PSL2 due to the mandatory impact testing and tighter compositional control needed at this strength level.
Q: Is X65 pipe suitable for sour service?
A: Not by default. Sour service (H2S-containing environments) requires additional NACE MR0175/ISO 15156 compliance, which must be specified separately at time of order.
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