ERW Welded Pipe
Electric Resistance Welded – OD 5mm – 256mm | WT 0.8mm – 12mm
Carbon Steel – ASTM A53 / API 5L / EN 10217 / GB/T 3091
Product Overview
Our ERW (Electric Resistance Welded) steel pipe is manufactured by cold forming a steel coil into a cylindrical shape and welding the seam using high-frequency electric resistance welding. This process produces a pipe with a consistent weld seam, excellent dimensional accuracy, and cost-effectiveness for general applications.
With outer diameters from 5mm to 256mm and wall thicknesses from 0.8mm to 12mm, our ERW pipes are ideal for water, gas, oil transmission, structural applications, and low to medium pressure services.
Key Features:
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ERW process – High-frequency electric resistance welded
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Cost-effective – Lower price than seamless pipe
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Consistent quality – Automated production line
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Wide size range – OD 5-256mm – one-stop sourcing
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Good weldability – Easy field welding
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100% hydrostatic tested – Guaranteed integrity
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Full traceability – EN 10204 Type 3.1 MTC with heat number
✅ ERW manufacturing – Cost-effective alternative to seamless
✅ Smooth surface – Clean, scale-free finish
✅ Good formability – Suitable for bending, grooving, threading
✅ Fast delivery – Stock sizes ready to ship
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| OD Range | 5mm – 256mm (0.197″ – 10.079″) |
| WT Range | 0.8mm – 12mm |
| Length | 4m – 12m (fixed or random) |
| Manufacturing | ERW (Electric Resistance Welded) |
| Material | Carbon Steel |
| Surface Finish | Black / Bare / Oiled / Galvanized / Painted |
| End Finish | Plain / Beveled / Threaded / Grooved |
| Delivery Condition | As-welded or Heat treated after welding |
Standards & Grades
| Standard | Grades | Application |
|---|---|---|
| ASTM A53 | Gr.B | General pressure piping |
| API 5L | Gr.B, X42, X52, X60, X65, X70 | Oil & gas pipelines |
| ASTM A500 | Gr.B, Gr.C | Structural tubing |
| ASTM A135 | Gr.A, Gr.B | Electric-resistance-welded steel pipe |
| ASTM A178 | Gr.A, Gr.C, Gr.D | Boiler tubes |
| EN 10217-1 | P195TR1, P235TR1, P265TR1 | Pressure purposes |
| EN 10217-2 | P235GH, P265GH | Elevated temperature |
| EN 10219-1 | S235JRH, S275J0H, S355J2H | Structural hollow sections |
| GB/T 3091 | Q195, Q215, Q235 | Fluid transport |
| GB/T 9711 | L245, L290, L360, L415, L450 | Petroleum pipelines |
| JIS G3444 | STK400, STK490 | General structural |
Chemical Composition (Typical – Grade B / Q235B)
| Element | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| Requirement | ≤0.22 | ≤0.35 | 0.30-0.80 | 0.035 | 0.035 |
💡 Low carbon content ensures excellent weldability for field joining.
Mechanical Properties (Typical – Grade B / Q235B)
| Property | Value |
|---|---|
| Tensile Strength | ≥415 MPa |
| Yield Strength | ≥240 MPa |
| Elongation | ≥23% |
Available Sizes – ERW Pipe
| OD (mm) | OD (inch) | WT Range (mm) | Typical Applications |
|---|---|---|---|
| 5 – 20 | 0.197″ – 0.787″ | 0.8 – 2.0 | Instrumentation, small bore |
| 20 – 50 | 0.787″ – 1.968″ | 1.5 – 3.5 | Water lines, air lines |
| 50 – 100 | 1.968″ – 3.937″ | 2.0 – 6.0 | Water supply, scaffolding |
| 100 – 200 | 3.937″ – 7.874″ | 3.0 – 8.0 | Gas transmission, structural |
| 200 – 256 | 7.874″ – 10.079″ | 4.0 – 12.0 | Large diameter water/oil lines |
💡 Most popular sizes: 21.3mm, 26.9mm, 33.7mm, 42.4mm, 48.3mm, 60.3mm, 76.1mm, 88.9mm, 114.3mm, 168.3mm, 219.1mm OD
Grade Selection Guide
| Application | Recommended Grade | Standard | Key Feature |
|---|---|---|---|
| Water supply | Q235B, A53 Gr.B | GB/T 3091, ASTM A53 | Cost-effective |
| Natural gas distribution | X42, X52 | API 5L | Medium pressure |
| Structural support | S355J2H, A500 Gr.C | EN 10219, ASTM A500 | High strength |
| Scaffolding | Q235B, STK400 | GB/T 3091, JIS G3444 | Lightweight |
| Low pressure boiler | A178 Gr.A | ASTM A178 | Heat resistance |
| Fire protection | Q235B, A53 Gr.B | GB/T 3091, ASTM A53 | Pressure tested |
| Oil transmission | X60, X65 | API 5L | High pressure |
Applications by Industry
| Industry | Application | Recommended Grade |
|---|---|---|
| Water Supply | Municipal water distribution | Q235B, A53 Gr.B |
| Oil & Gas | Low to medium pressure transmission | API 5L X42-X65 |
| Construction | Scaffolding, structural frames | Q235B, S355J2H |
| Fire Protection | Sprinkler systems, fire mains | A53 Gr.B |
| HVAC | Chilled water, heating pipes | Q235B |
| Agriculture | Irrigation systems | Q235B |
| Industrial | Compressed air, process water | A53 Gr.B |
| Mining | Slurry transport (low pressure) | API 5L Gr.B |
| Fencing & Furniture | Handrails, frames, gates | Q195, Q235B |
Advantages of ERW Pipe
| Feature | Benefit |
|---|---|
| Cost-effective | Lower price than seamless pipe |
| Consistent dimensions | Automated production ensures uniformity |
| Smooth surface | Clean, scale-free – ready for coating |
| Good weldability | Easy field welding with standard procedures |
| Fast production | Short lead times for large quantities |
| Long lengths | Up to 18m available |
ERW vs Seamless – Comparison
| Feature | ERW Pipe | Seamless Pipe |
|---|---|---|
| Manufacturing | Welded from coil | Rolled/pierced from billet |
| Weld seam | Present (heat treated) | No weld seam |
| Pressure rating | Medium to high | Highest |
| High temperature | Limited | Superior |
| Sour service | Limited (weld seam concern) | Better |
| Cost | Lower | Higher |
| Lead time | Faster | Longer |
| Best for | General applications | Critical service |
Quality Assurance & Testing
| Test | Method | Coverage | Applicable |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | All |
| Ultrasonic Testing (UT) | Non-destructive | By agreement | Weld seam |
| Eddy Current (ET) | Non-destructive | By agreement | Weld seam |
| Tensile Test | ASTM E8 | Per lot | All |
| Flattening Test | Ductility | Per lot | All |
| Reverse Flattening Test | Weld seam | Per lot | Weld integrity |
| Dimensional Inspection | Micrometer | 100% | All |
| Visual Examination | Direct | 100% | All |
Mill Test Certificate
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EN 10204 Type 3.1 MTC – Standard
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EN 10204 Type 3.2 – Available upon request (SGS, BV, TUV)
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Traceability: Full traceability from coil to finished pipe
Processing Services
| Service | Description |
|---|---|
| Cutting | Precision cutting to exact length |
| Beveling | For welding preparation |
| Threading | NPT, BSP, or custom threads |
| Grooving | For mechanical couplings |
| Galvanizing | Hot-dip galvanized finish |
| Coating | 3LPE, FBE, black paint |
| Bending | Cold bending |
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles with steel strapping |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, standard |
| Lead time | 7-15 days (stock sizes), 20-30 days (custom) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our ERW Welded Pipe?
| Advantage | Description |
|---|---|
| Cost-effective solution | Lower cost than seamless pipe |
| Wide size range | OD 5-256mm – one-stop sourcing |
| Multiple standards | ASTM, API, EN, GB – all available |
| Stock availability | Common sizes ready to ship |
| 100% hydrostatic tested | Guaranteed pressure integrity |
| Full traceability | EN 10204 3.1 MTC with heat number |
| In-house processing | Cutting, threading, grooving, coating |
| Competitive pricing | Factory direct – no middlemen |
| Global export | Shipped to over 30 countries |
Contact for Quote
Please provide the following details:
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Standard : ASTM / API / EN / GB / Other _______
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Grade : _______
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OD (mm) : _______
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WT (mm) : _______
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Length (m) : _______
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Quantity : _______ (pieces / meters / tons)
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Application : _______
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End Finish : Plain / Beveled / Threaded / Grooved
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Coating : Black / Oiled / Galvanized / 3LPE / None
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Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: www.hzhmetals.com / www.wuxihengzhihui.com
Reply within 24 hours.
FAQ – ERW Welded Pipe
Q1: What is the difference between ERW and seamless pipe?
A: ERW – welded seam, lower cost, suitable for general applications. Seamless – no weld seam, higher pressure rating, higher cost.
Q2: Is ERW pipe suitable for high pressure applications?
A: Yes – for medium to high pressure (up to API 5L X70). For ultra-high pressure, seamless is recommended.
Q3: What is the maximum size available for ERW pipe?
A: 256mm OD standard. Larger sizes up to 610mm available upon request.
Q4: Is the weld seam heat treated?
A: Yes – most ERW pipes undergo heat treatment after welding to relieve stress and normalize the weld zone.
Q5: Can ERW pipe be used for oil & gas pipelines?
A: Yes – API 5L ERW pipe is widely used for oil and gas transmission, especially X42, X52, X65 grades.
Q6: Is ERW pipe suitable for galvanizing?
A: Yes – ERW pipes are commonly hot-dip galvanized for water and gas lines.
Q7: Can ERW pipe be threaded?
A: Yes – ERW pipes can be threaded with NPT or BSP threads for mechanical connections.
Q8: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Q9: Do you offer free samples?
A: 30cm sample available for common sizes. Shipping fee applies.
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Tags: ERW Pipe ERW Steel Pipe Electric Resistance Welded Pipe ASTM A53 API 5L Welded Steel Pipe GB/T 3091
