manufactured from high-quality carbon structural steel via the hot-rolled process. It strictly complies with both ASTM A106API 5L standards, delivering excellent high-temperature resistance and reliable pipeline transmission performance. The surface naturally exhibits a dark oxide scale (black pipe finish) formed during hot rolling, which provides basic corrosion resistance and good adhesion for subsequent coatings. It is widely applied in demanding sectors such as oil & gas, petrochemicals, boiler systems, and mechanical structures.
| ASTM A106 / ASME SA-106 | High-temperature service (boilers, superheaters, heat exchangers) | Tensile >= 415 MPa, Yield >= 240 MPa, Max service temp ~ 427℃ | |
| API 5L | Long-distance oil/gas transmission and gathering lines | PSL1 / PSL2 Grade B |
, meaning a single pipe meets both A106 Gr.B and API 5L Gr.B requirements, simplifying procurement and inventory management.
Manufactured via hot-rolled piercing, eliminating weld seams and associated stress/defect risks. Compared to welded pipes (e.g., ERW), seamless pipes offer superior safety under high pressure, high temperature, and corrosive conditions.
Hot-Rolled Black Finish: Features a dense oxide scale layer that provides natural rust resistance and excellent adhesion for epoxy coatings, bituminous linings, or subsequent machining.
Advanced rolling mills ensure OD, wall thickness, and ovality tolerances meet international specification requirements.
Normalizing or annealing can be performed upon request to relieve internal stresses and optimize grain structure.
Onshore/offshore transmission pipelines, drill pipes, casing, and tubing.
High-temperature steam lines, boiler superheater tubes, refinery furnace tubes, and heat exchanger piping.
Pressure pipes for machinery manufacturing, structural supports, piling components.
detailing chemical composition, mechanical properties, hydrostatic test results, and NDT data.
Third-party inspection agencies (e.g., SGS, BV, TÜV) are welcome for mill surveillance or final release inspection.
Hydrostatic testing, eddy current, or ultrasonic testing are performed per standard requirements to ensure zero internal defects.
We are committed to providing cost-effective, high-quality seamless steel pipe products and professional technical services to customers worldwide.
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