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This product is a high-frequency electric resistance welded (ERW) straight-seam carbon steel pipe, manufactured from hot-rolled steel coils through forming, high-frequency welding, weld heat treatment, and sizing/straightening. Supplied with a black surface (mill finish/oiled), it is specifically engineered for heavy structural load-bearing and mechanical applications. Combining high strength, precise geometry, and excellent weldability, it is ideal for steel structures, piling, heavy machinery frames, conveyor rollers, and industrial equipment fabrication.
Key Advantages
① High Strength & Reliability
The ERW process utilizes skin and proximity effects of high-frequency current to heat pipe edges, followed by squeeze-roll pressure bonding-without filler metal-yielding weld chemistry identical to the base metal. Coupled with in-line post-weld heat treatment (normalizing/annealing), the weld microstructure is refined and residual stresses relieved, ensuring uniform mechanical properties across both pipe body and weld. This meets the stringent yield strength and impact toughness demands of heavy structural applications.
② Precise Geometry
Formed from hot-rolled strip and welded, ERW pipe exhibits uniform wall thickness, low ovality, and excellent straightness, with tight OD and WT tolerances. Compared with seamless pipe, ERW offers notable advantages in wall thickness uniformity and length consistency, facilitating cutting, beveling, and field assembly.
③ Black Surface · Ready to Use
Delivered with black mill finish or rust-preventive oil coating, free from galvanized layer and injurious surface defects. Suitable for direct welding, cutting, machining, or subsequent painting-eliminating extra surface preparation steps and reducing customer processing costs.
④ Comprehensive Standard Coverage
Manufactured to ASTM A513 (ERW carbon steel mechanical tubing), ASTM A500 (cold-formed welded structural tubing), EN 10219 (cold-formed welded structural hollow sections), GB/T 3091, and other standards. Steel grades include Q235B, Q345B, S235JRH, S355J2H, Gr.B, etc., meeting diverse structural design and machinery fabrication specifications.
Typical Applications
| Sector | Specific Use |
|---|---|
| Steel Structures | Factory columns, truss chords, space frames, temporary supports |
| Piling & Foundation | Steel pipe piles, shoring piles, excavation support |
| Heavy Machinery | Crane booms, conveyor rollers, equipment frames, hydraulic cylinders |
| Industrial Fabrication | Roller tubes, drive shaft casings, storage racks, agricultural frames |
| General Structures | Scaffolding, guardrails, billboard supports, grandstand components |
Available Size Range
| Item | Range |
|---|---|
| OD | 21.3 mm ~ 610 mm (customizable upon negotiation) |
| WT | 1.6 mm ~ 19.1 mm |
| Length | 6 m / 12 m, or cut-to-length per customer |
| Pipe End | Plain / Beveled |
| Surface | Black oiled / Bare |
| Grade | Q235B, Q345B, S235JRH, S355J2H, Gr.B, Gr.C, etc. |
| Standard | ASTM A513 / A500, EN 10219, GB/T 3091 |
Why Choose Us
● Proven Process: ERW high-frequency welding + in-line weld heat treatment for consistent weld quality
● Dimensional Precision: Uniform wall, low ovality, excellent straightness-minimizing field machining allowance
● Ready-to-Use Surface: Black oiled finish, weldable or machinable right out of the bundle
● Standard Flexibility: GB, ASTM, and EN production capabilities; custom fabrication per drawing
● Reliable Lead Times: Stock available for standard sizes; scheduled production for bulk orders
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