Carbon Steel ERW Pipe — Factory Direct Supplier | Huaxia-Steel
Huaxia-Steel supplies carbon steel ERW (Electric Resistance Welded) pipe for structural, mechanical, and fluid conveyance applications worldwide. Our ERW pipe is manufactured to ASTM A53 Grade A/B, API 5L, and EN 10219 standards, with outer diameters from 1/2 inch to 24 inches and wall thicknesses from Sch 10 to Sch 160. As a factory-direct supplier with integrated pipe mill operations, we offer competitive pricing, full traceability documentation, and containerized shipping to 80+ countries.
Product Overview
Electric Resistance Welded pipe is produced by cold-forming a flat steel strip into a cylindrical shape and passing a high-frequency electrical current through the edges to heat and fuse them together. This manufacturing process delivers consistent wall thickness, excellent dimensional accuracy, and cost efficiency compared to seamless pipe for low-to-medium pressure applications.
Carbon steel ERW pipe serves as the backbone of infrastructure projects, including water distribution systems, fire protection networks, structural columns, fencing, and low-pressure oil and gas pipelines. When specified with proper surface treatment — hot-dip galvanizing, external coating, or internal lining — ERW pipe achieves service lifetimes exceeding 50 years in typical environments.
Specifications and Dimensions
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | 1/2″ (21.3mm) to 24″ (609.6mm) |
| Wall Thickness | Sch 10, Sch 20, Sch 40, Sch 80, Sch 120, Sch 160; 1.0mm–25.4mm |
| Length | Fixed: 5.8m, 6.0m, 11.8m, 12.0m; Random: 4m–12m |
| Ends | Plain end (PE), Beveled end (BE), Threaded with coupling |
| Weight Tolerance | ±6.5% on single pipe, ±4.0% on carload lots (ASTM A53) |
| OD Tolerance | ±0.4mm (≤ 48.3mm OD), ±0.79mm (48.3–114.3mm), ±1% (> 114.3mm) |
| Wall Thickness Tolerance | +不限 / -12.5% (ASTM A53); ±10% (API 5L) |
Standard Dimension Reference (ASTM A53 Grade B, Sch 40)
| Nominal Size | OD (mm) | Wall (mm) | Weight (kg/m) |
|---|---|---|---|
| 1/2″ | 21.3 | 2.77 | 1.27 |
| 3/4″ | 26.7 | 2.87 | 1.69 |
| 1″ | 33.4 | 3.38 | 2.50 |
| 1-1/2″ | 48.3 | 3.68 | 4.05 |
| 2″ | 60.3 | 3.91 | 5.44 |
| 3″ | 88.9 | 5.49 | 11.29 |
| 4″ | 114.3 | 6.02 | 16.07 |
| 6″ | 168.3 | 7.11 | 28.26 |
| 8″ | 219.1 | 8.18 | 42.55 |
| 10″ | 273.0 | 9.27 | 60.31 |
| 12″ | 323.8 | 10.31 | 79.71 |
Available Steel Grades and Standards
| Standard | Grade | Yield (MPa) | Tensile (MPa) | Application |
|---|---|---|---|---|
| ASTM A53 | Grade A | 205 | 330 | General purpose, low pressure |
| ASTM A53 | Grade B | 240 | 415 | Pressure piping, structural |
| API 5L | Grade B / X42 | 241 / 289 | 414 / 414 | Oil and gas transmission |
| API 5L | X52 / X56 | 359 / 386 | 455 / 490 | High-pressure pipelines |
| EN 10219 | S235JRH | 235 | 360–510 | Cold-formed structural hollow sections |
| EN 10219 | S355J2H | 355 | 470–630 | High-strength structural applications |
| ASTM A500 | Grade A / B / C | 230 / 290 / 315 | 310 / 400 / 427 | Structural tubing |
| JIS G3444 | STK400 / STK490 | 235 / 315 | 400 / 490 | General structural (Japan) |
Manufacturing Standards and Tolerances
Our ERW pipe manufacturing complies with the following international standards:
- ASTM A53 / A53M: Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
- API 5L: Specification for Line Pipe (PSL1 and PSL2)
- ASTM A500 / A500M: Cold-Formed Welded and Seamless Carbon Steel Structural Tubing
- EN 10219-1 / 10219-2: Cold formed welded structural hollow sections
- JIS G3444: Carbon steel tubes for general structural purposes
- GB/T 3091: Welded steel pipes for low pressure liquid delivery
Weld Quality Requirements
All ERW pipe undergoes 100% hydrostatic testing per standard requirements. API 5L pipe receives additional non-destructive testing (NDT) including ultrasonic inspection of the weld seam and eddy current testing for surface defects. Weld flash is removed internally and externally to specified tolerances.
Applications
- Water and Wastewater: Potable water distribution, sewage systems, drainage pipelines (ASTM A53, AWWA C200)
- Fire Protection: Sprinkler systems and standpipes (UL/FM listed where required)
- Oil and Gas: Low-pressure gathering lines, transmission pipelines (API 5L)
- Structural: Building columns, purlins, truss members, scaffolding (ASTM A500, EN 10219)
- Fencing and Guardrails: Highway guardrails, security fencing, sign posts
- Mechanical: Machinery frames, conveyor systems, roll cages
Surface Treatment and Coatings
| Treatment | Coating Weight | Service Life | Standard |
|---|---|---|---|
| Black (as-rolled) | None | Indoor use only | ASTM A53 |
| Hot-dip galvanized | ≥ 600 g/m² (85 microns) | 30–50 years (rural) | ASTM A53 Type E, F |
| Pre-galvanized | ≥ 120 g/m² | 10–20 years | ASTM A53 |
| 3LPE external coating | 2.0–3.7mm total | 30–50 years | DIN 30670 |
| Epoxy internal lining | ≥ 250 microns | 20–30 years | AWWA C210 |
| Bitumen coating | 1–2mm | 20–30 years | BS 534 |
Quality Assurance
Huaxia-Steel maintains comprehensive quality control throughout the ERW pipe manufacturing process:
- Incoming Material Inspection: Chemical composition verification and dimensional checks on steel strip
- In-Process Control: Real-time monitoring of forming parameters, welding current, and seam alignment
- Dimensional Inspection: OD, wall thickness, length, straightness, and squareness of cut ends
- Mechanical Testing: Tensile test, flattening test, bend test on sample pipes per heat/lot
- Hydrostatic Testing: 100% pressure testing to standard-specified test pressure
- NDT Inspection: Ultrasonic and eddy current testing per API 5L and customer requirements
- Final Inspection: Visual inspection, marking verification, and coating thickness measurement
All shipments include EN 10204 3.1 Mill Test Certificates documenting chemical composition, mechanical properties, dimensional test results, and hydrostatic test pressure.
Packaging and Shipping
- Bundling: Pipes bundled with steel straps (6–8 straps per bundle depending on diameter)
- End Protection: Plastic or steel end caps for threaded or beveled ends
- Surface Protection: Oil coating for black pipe; VCI film wrapping for long-term storage
- Loading: Direct mill-to-container loading with dunnage to prevent transit damage
- Marking: Heat number, grade, standard, size, and “Made in China” stenciled on each pipe
Ordering Information
To receive a detailed quotation, please provide:
- Standard and grade (e.g., ASTM A53 Grade B, API 5L X52)
- Nominal size or outer diameter and wall thickness
- Quantity (meters or tons)
- Surface treatment requirements
- End finish (plain, beveled, threaded)
- Length requirements
- Destination port and Incoterms preference
Contact Huaxia-Steel today for competitive pricing on carbon steel ERW pipe. We offer flexible MOQs starting from 5 tons, third-party inspection coordination (SGS, BV, TÜV), and full export documentation support. Request your ERW pipe quotation and receive a detailed proposal within 24 hours.
