Product Overview
| Item | Details |
| Product Name | Large Diameter ERW Steel Pipe OD 219mm-660mm Industrial Pipeline |
| Production Process | Electric Resistance Welded (ERW) - High-frequency resistance welding, continuous forming, strict dimensional control |
| Outer Diameter Range | 219 mm – 660 mm |
| Wall Thickness Range | 5 mm – 25 mm |
| Length | Fixed length: 6m, 12m; Random length: 5.8m–12m; Customized length available |
| Material Grade | Carbon steel: Q235, Q345, S235JR, S355JR, A53 Gr.B, A106 Gr.B, API 5L Gr.B, X42, X46, X52, X60, X65, X70 |
| Standard Compliance | API 5L, ASTM A53, ASTM A106, EN 10217, GB/T 3091, GB/T 9711 |
| Application | Industrial fluid transmission, oil & gas pipeline, water supply & drainage, heating engineering, chemical industry, power plant, structural engineering |
Dimensions
| Outer Diameter (OD) | Tolerance | Wall Thickness (WT) | Tolerance | Length Tolerance |
| 219mm – 355mm | ±0.75% OD | 5mm – 12mm | ±10% WT | 0mm / +20mm |
| 377mm – 530mm | ±0.80% OD | 8mm – 18mm | ±10% WT | 0mm / +20mm |
| 550mm – 660mm | ±1.00% OD | 10mm – 25mm | ±12.5% WT | 0mm / +20mm |
Mechanical Properties
| Material Grade | Yield Strength (Min) | Tensile Strength (Min) | Elongation (Min) | Impact Test |
| Q235 / A53 Gr.B | 235 MPa | 370 MPa | 24% | Optional |
| Q345 / S355JR | 345 MPa | 470 MPa | 22% | Optional |
| API 5L Gr.B | 241 MPa | 414 MPa | 23% | Standard |
| API 5L X42–X70 | 290–485 MPa | 414–565 MPa | 20%–22% | Standard |
Chemical Composition
| Grade | C (Max) | Si | Mn | P (Max) | S (Max) |
| A53 Gr.B / API 5L Gr.B | 0.3 | 0.10–0.35 | 0.29–1.06 | 0.05 | 0.045 |
| Q235 | 0.22 | ≤0.35 | ≤1.40 | 0.045 | 0.045 |
| Q345 | 0.2 | ≤0.55 | ≤1.70 | 0.035 | 0.035 |
| X42–X70 | 0.12–0.20 | 0.15–0.45 | 1.00–1.60 | 0.025 | 0.015 |
Manufacturing & Quality Control
| Process Stage | Control Measures & Standards |
| Raw Material Inspection | Chemical composition analysis, mechanical property test, surface defect detection |
| Forming Process | Continuous cold forming, roll design optimization, consistent roundness |
| Welding Process | High-frequency resistance welding, online temperature monitoring, no filler metal |
| Weld Seam Treatment | Internal & external weld bead removal, smooth transition, full penetration guarantee |
| Heat Treatment | Normalizing / Stress relief (optional, per requirement) |
| Dimensional Check | OD, WT, length, straightness, ovality - 100% online measurement |
| Non-Destructive Testing | Ultrasonic testing (UT), Eddy current testing (ET), Hydrostatic test (100% pressure test up to 10–50 MPa) |
| Surface Inspection | Visual check for cracks, scratches, dents; wall thickness uniformity verification |
Surface Treatment & Coating Options
| Treatment Type | Description | Application Scenario |
| Bare / Black Varnish | Mill finish, light oil coating for temporary anti-rust | General industrial use, internal transmission |
| Hot-Dip Galvanized | Zinc coating 85–100μm, excellent corrosion resistance | Water supply, outdoor pipeline, civil engineering |
| Epoxy Coating | Fusion bonded epoxy (FBE), thickness 300–600μm | Oil & gas, chemical, high corrosion environment |
| 3PE / 3PP Coating | Polyethylene / polypropylene three-layer structure, long-term protection | Buried pipeline, marine engineering, long-distance transmission |
| Anti-Corrosion Paint | Coal tar epoxy, asphalt paint, customized coating | Underground drainage, sewage treatment |
End Finishes
| End Type | Specification | Usage |
| Plain End (PE) | Deburred, square cut | Butt welding, socket connection |
| Beveled End (BE) | 30°±5° bevel, 1.6mm±0.8mm root face | High-pressure welding, long-distance pipeline |
| Threaded End | NPT / BSP thread, with coupling | Low-pressure, small-diameter branch connection |
| Grooved End | Standard groove for mechanical coupling | Fast installation, fire protection system |
Packaging & Marking
| Item | Details |
| Packaging | Standard export packaging: Bundled with steel strips, covered with waterproof plastic or woven cloth; Customized packaging available |
| Marking | Permanent marking: Product name, standard, material grade, OD × WT × Length, batch number, manufacturer logo, inspection stamp |
| Documents | Mill test report (MTR), material certificate, inspection report, packing list, commercial invoice, certificate of origin |
Key Features & Advantages
★High Dimensional Accuracy : Strict tolerance control, good interchangeability, easy installation and connection.
★Reliable Weld Quality: Uniform weld structure, high strength, no porosity or slag inclusion, same performance as base material.
★Excellent Pressure Resistance: Meet or exceed standard pressure levels, suitable for medium and high-pressure transmission.
★Wide Size Range: Covering 219mm–660mm OD, flexible for various project requirements.
★Cost-Effective : High production efficiency, stable quality, competitive price compared to seamless pipe.
★Customization Support: Material, size, length, coating, ends, all can be adjusted per project needs.
Main Applications
★Oil & Gas Transportation: Main pipeline, gathering pipeline, transmission network.
★Water Engineering: Water supply, drainage, sewage treatment, municipal pipeline network.
★Energy Industry: Thermal power, hydropower, heating pipeline, steam transmission.
★Chemical & Petrochemical: Process pipeline, medium transmission, anti-corrosion system.
★Structural Engineering: Piling, bridge support, steel structure column, foundation pipe.
★Mining & Metallurgy: Slurry transmission, ventilation pipeline, industrial fluid system.
Technical Support & Services
★Customized design and material selection according to working conditions.
★Complete technical data and calculation support.
★Third-party inspection support (SGS, BV, TÜV, etc.).
★Fast delivery: 15–30 days for bulk order.
★Professional after-sales service and technical consultation.
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