Huaxia-Steel manufactures and exports carbon steel welded pipe for construction, oil and gas, water transmission, mechanical, and structural applications. Our welded pipe portfolio includes ERW (electric resistance welded), LSAW (longitudinal submerged arc welded), and SSAW (spiral submerged arc welded) pipes in a wide range of diameters, wall thicknesses, and grades. With mill-direct pricing, strict dimensional control, and full material certification, we support projects from standard commercial pipe to large-diameter pipeline orders.
Product Overview
Carbon steel welded pipe is produced by forming flat steel plate or coil into a cylindrical shape and welding the seam. ERW pipe uses high-frequency electric resistance welding for smaller diameters and thinner walls. LSAW and SSAW pipes use submerged arc welding for larger diameters and heavier walls used in energy transmission and piling.
Specifications
| Parameter | Range / Standard |
|---|---|
| Outside Diameter | 21.3mm to 3,048mm (1/2 in to 120 in) |
| Wall Thickness | 1.0mm to 60mm |
| Length | 5.8m, 6m, 11.8m, 12m, or custom |
| Ends | Plain, beveled, threaded, grooved |
| Coating | Black, bare, galvanized, 3PE, FBE, epoxy |
Available Grades and Standards
| Standard | Grade | Application |
|---|---|---|
| ASTM A53 | Grade A, Grade B | Pressure, mechanical, structural |
| ASTM A252 | Grade 1, 2, 3 | Piling pipe |
| API 5L | Grade B, X42-X80 | Oil and gas transmission |
| EN 10217 | P235TR1, P265TR1, P355TR1 | Pressure purposes |
| EN 10219 | S235JRH, S355J2H | Cold-formed structural hollow sections |
| GB/T 3091 | Q235B, Q345B | Low pressure fluid transmission |
Manufacturing Standards
Our welded pipe mills operate under ISO 9001 quality management with inline ultrasonic testing of welds, hydrostatic testing, and dimensional inspection. ERW mills use solid-state high-frequency welders. LSAW and SSAW lines are equipped with automatic submerged arc welding and X-ray or ultrasonic inspection stations. Each pipe is traceable to raw material heat number and production batch.
Applications
- Oil and gas pipelines
- Water supply and sewage systems
- Structural and piling applications
- Mechanical and machinery pipe
- Fire protection and sprinkler systems
- Scaffolding and construction
Quality Assurance
Each production lot is tested for chemical composition, tensile properties, flattening, bend, weld tensile, and hydrostatic pressure. NDT includes ultrasonic or radiographic weld inspection when specified. Mill test certificates conform to EN 10204 3.1 or 3.2. Third-party inspection by SGS, BV, TUV, or LR is available.
Packing and Shipping
Small-diameter pipes are bundled with steel straps and protected with plastic caps. Large-diameter pipes are loaded loose or on cradles. External coating is protected with wrapping. For ocean shipment, pipes are loaded in bulk vessels or containers depending on diameter and quantity. Marking includes grade, standard, heat number, size, and bundle number.
Request a quotation for carbon steel welded pipe today. Provide diameter, wall thickness, length, grade, standard, quantity, coating, and destination. Huaxia-Steel delivers competitive FOB, CFR, and CIF pricing with 15-35 day production lead time.
