ERW Steel Pipe
High-frequency electric resistance welded pipes for oil & gas, water supply, scaffolding, and structural applications. Available in round, square, and rectangular shapes.
ERW Steel Pipe
Electric Resistance Welding (ERW) is a welding process that joins metal surfaces by applying pressure and passing current through the contact area. ERW steel pipes are produced from hot-rolled steel coils that are cold-formed into a cylindrical shape and longitudinally welded.
Unlike seamless pipes, ERW pipes offer excellent dimensional accuracy, uniform wall thickness, and superior surface finish. They are widely used in low to medium pressure applications and are available in round, square, and rectangular shapes.
Technical Specifications
Applicable Standards
| Standard | Available Steel Grades | Description |
|---|---|---|
| API SPEC 5L | Gr.B, X42, X46, X52, X56, X60, X70 (PSL1 & PSL2) | Specification for line pipe used in oil & gas transportation systems |
| ASTM A53 | Grade A, Grade B | Standard for black and hot-dipped galvanized welded and seamless steel pipe |
| ASTM A500 | Grade A, B, C, D | Standard for cold-formed welded and seamless carbon steel structural tubing |
| EN 10219 | S235JR, S275JR, S355JR, S355J0, S355J2 | European standard for cold-formed welded structural hollow sections |
| EN 10217 | S235JR, S275JR, S355JR, S355J0, S355J2, P195, P235, P265, P355 | European standard for welded steel tubes for pressure purposes |
| EN 10255 | Light, Medium, Heavy Series | European standard for non-alloy steel tubes suitable for welding and threading (successor to BS 1387) |
| AS/NZS 1163 | C250, C350, C350L0 | Australian/New Zealand standard for cold-formed steel hollow sections |
| ASTM A252 | Grade 1, Grade 2, Grade 3 | Standard for welded and seamless steel pipe piles |
| BS 1387 | ERW Grade, Light, Medium, Heavy | British standard for screwed and socketed steel tubes for water, gas, and air |
ERW Pipe Dimensions (Round)
| DN | NPS (in) | OD (mm) | SCH10 | SCH20 | SCH30 | STD | SCH40 | SCH60 | XS | SCH80 |
|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 1/2 | 21.3 | 2.11 | – | 2.41 | 2.77 | 2.77 | – | 3.73 | 3.73 |
| 20 | 3/4 | 26.7 | 2.11 | – | 2.41 | 2.87 | 2.87 | – | 3.91 | 3.91 |
| 25 | 1 | 33.4 | 2.77 | – | 2.90 | 3.38 | 3.38 | – | 4.55 | 4.55 |
| 32 | 1-1/4 | 42.2 | 2.77 | – | 2.97 | 3.56 | 3.56 | – | 4.85 | 4.85 |
| 40 | 1-1/2 | 48.3 | 2.77 | 3.18 | 3.68 | 3.68 | – | – | 5.08 | 5.08 |
| 50 | 2 | 60.3 | 2.77 | 3.18 | 3.91 | 3.91 | – | – | 5.54 | 5.54 |
| 65 | 2-1/2 | 73 | 3.05 | – | 4.78 | 5.16 | 5.16 | – | 7.01 | 7.01 |
| 80 | 3 | 88.9 | 3.05 | – | 4.78 | 5.49 | 5.49 | – | 7.62 | 7.62 |
| 90 | 3-1/2 | 101.6 | 3.05 | – | 4.78 | 5.74 | 5.74 | – | 8.08 | 8.08 |
| 100 | 4 | 114.3 | 3.05 | – | 4.78 | 6.02 | 6.02 | – | 8.56 | 8.56 |
| 125 | 5 | 141.3 | 3.40 | – | – | 6.55 | 6.55 | – | 9.53 | 9.53 |
| 150 | 6 | 168.3 | 3.40 | – | – | 7.11 | 7.11 | – | 10.97 | 10.97 |
| 200 | 8 | 219.1 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 10.31 | 12.70 | 12.70 |
| 250 | 10 | 273.1 | 4.19 | 6.35 | 7.80 | 9.27 | 9.27 | 12.70 | 12.70 | 15.09 |
| 300 | 12 | 323.9 | 4.57 | 6.35 | 8.38 | 9.53 | 10.31 | 14.27 | 12.70 | 17.48 |
| 350 | 14 | 355.5 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 15.09 | 12.70 | – |
| 400 | 16 | 406.4 | 6.35 | 7.92 | 9.53 | 9.53 | 12.70 | 16.66 | 12.70 | – |
| 450 | 18 | 457.2 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | – | 12.70 | – |
| 500 | 20 | 508.0 | 6.35 | 9.53 | 12.70 | 9.53 | 15.09 | – | 12.70 | – |
| 550 | 22 | 553.8 | 6.35 | 9.53 | 12.70 | 9.53 | – | – | 12.70 | – |
| 600 | 24 | 609.6 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | – | 12.70 | – |
| 660 | 26 | 660.4 | 7.92 | 12.70 | – | 9.53 | – | – | 12.70 | – |
Chemical Composition (%)
| Grade | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cu (max) | Others (max) |
|---|---|---|---|---|---|---|---|
| API 5L PSL1 Gr.B (L245) | 0.26 | — | 1.20 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X42 (L290) | 0.26 | — | 1.30 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X46 (L320) | 0.26 | — | 1.40 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X52 (L360) | 0.26 | — | 1.40 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X56 (L390) | 0.26 | — | 1.40 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X60 (L415) | 0.26 | — | 1.40 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X65 (L450) | 0.26 | — | 1.45 | 0.030 | 0.030 | 0.50 | ① |
| API 5L PSL1 X70 (L485) | 0.26 | — | 1.65 | 0.030 | 0.030 | 0.50 | ① |
| ASTM A53 Gr.B | 0.30 | — | 1.20 | 0.050 | 0.045 | 0.40 | Ni 0.40 / Cr 0.40 / Mo 0.15 |
| ASTM A500 Gr.B | 0.26 | — | 1.35 | 0.035 | 0.035 | 0.20 min ② | — |
| ASTM A252 Gr.2 | — | — | — | 0.050 | — | — | — |
| ASTM A252 Gr.3 | — | — | — | 0.050 | — | — | — |
| EN 10219 S235JR | 0.17 | — | 1.40 | 0.035 | 0.035 | 0.55 | N 0.012 |
| EN 10219 S355JR | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.55 | N 0.012 |
| EN 10217-1 P235TR1 | 0.16 | 0.35 | 1.20 | 0.025 | 0.020 | 0.30 | ③ |
| EN 10217-1 P235TR2 | 0.16 | 0.35 | 1.20 | 0.025 | 0.020 | 0.30 | ③ Al 0.020 min |
| AS/NZS 1163 C250L0 | 0.12 | 0.05 | 0.50 | 0.030 | 0.030 | — | ④ |
| AS/NZS 1163 C350L0 | 0.20 | 0.25 | 1.60 | 0.030 | 0.030 | — | ④ |
| EN 10255 / BS 1387 S195T | 0.20 | — | 1.40 | 0.035 | 0.030 | — | — |
| GB/T 3091 / GB/T 700 Q235B | 0.20 | 0.35 | 1.40 | 0.045 | 0.045 | 0.30 | Cr 0.30 / Ni 0.30 |
| GB/T 3091 / GB/T 1591 Q355B | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.40 | Cr 0.30 / Ni 0.30 / N 0.012 |
Notes: ① API 5L PSL1: Ni ≤ 0.50%, Cr ≤ 0.50%, Mo ≤ 0.15%, V+Nb+Ti ≤ 0.15% (welded pipe, t ≤ 25 mm; seamless C max 0.28%). ② A500: Cu ≥ 0.20% applies only when copper-bearing steel is specified. ③ EN 10217-1: Ni/Cr ≤ 0.30%, Mo ≤ 0.08%, Nb ≤ 0.010%, Ti ≤ 0.04%, V ≤ 0.02%; TR2 requires total Al ≥ 0.020%. ④ AS/NZS 1163: Cr ≤ 0.30%, Mo ≤ 0.10%, Al ≤ 0.10%, Ti ≤ 0.04%; CEV ≤ 0.25 (C250L0) / 0.43 (C350L0). C (max) for EN 10219 grades applies to thickness ≤ 16 mm; S355JR Si ≤ 0.55%; no Si limit specified for S235JR, A53, A500, S195T.
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact (Charpy V-notch) |
|---|---|---|---|---|
| API 5L PSL1 Gr.B (L245) | ≥415 | ≥245 | See note ① | — |
| API 5L PSL1 X42 (L290) | ≥415 | ≥290 | See note ① | — |
| API 5L PSL1 X46 (L320) | ≥435 | ≥320 | See note ① | — |
| API 5L PSL1 X52 (L360) | ≥460 | ≥360 | See note ① | — |
| API 5L PSL1 X56 (L390) | ≥490 | ≥390 | See note ① | — |
| API 5L PSL1 X60 (L415) | ≥520 | ≥415 | See note ① | — |
| API 5L PSL1 X65 (L450) | ≥535 | ≥450 | See note ① | — |
| API 5L PSL1 X70 (L485) | ≥570 | ≥485 | See note ① | — |
| ASTM A53 Gr.B | ≥415 | ≥240 | See note ② | — |
| ASTM A500 Gr.B | ≥400 | ≥290 | ≥23 | — |
| ASTM A252 Gr.2 | ≥414 | ≥241 | ≥25 | — |
| ASTM A252 Gr.3 | ≥455 | ≥310 | ≥20 | — |
| EN 10219 S235JR | 360–510 | ≥235 | ≥26 | 27 J @ +20 °C |
| EN 10219 S355JR | 470–630 | ≥355 | ≥22 | 27 J @ +20 °C |
| EN 10217-1 P235TR1 | 360–500 | ≥235 | ≥25 | — |
| EN 10217-1 P235TR2 | 360–500 | ≥235 | ≥25 | 40 J @ 0 °C |
| AS/NZS 1163 C250L0 | ≥320 | ≥250 | ≥18 | 27 J @ 0 °C |
| AS/NZS 1163 C350L0 | ≥430 | ≥350 | ≥16 | 27 J @ 0 °C |
| EN 10255 / BS 1387 S195T | 320–520 | ≥195 | ≥20 | — |
| GB/T 3091 / GB/T 700 Q235B | 370–500 | ≥235 | ≥26 | 27 J @ +20 °C |
| GB/T 3091 / GB/T 1591 Q355B | 470–630 | ≥355 | ≥22 | 34 J @ +20 °C |
Notes: ① API 5L PSL1 elongation is determined by the standard formula (varies with specimen size and wall thickness); PSL1 grades have no Charpy impact requirement (impact requirements apply to PSL2). ② A53 elongation per the standard formula (2 in. / 50 mm gauge). Yield/tensile values for EN 10219 and EN 10217-1 apply to thickness ≤ 16 mm; elongation is longitudinal (L₀ = 5.65√S₀). All impact values are longitudinal Charpy V-notch (KV₂): S235JR / S355JR 27 J at +20 °C (EN 10025-2); P235TR2 40 J at 0 °C (EN 10217-1); AS/NZS 1163 “L0” = 27 J min at 0 °C; Q235B 27 J at +20 °C (GB/T 700); Q355B 34 J at +20 °C (GB/T 1591-2018). Mechanical properties may vary with diameter and wall thickness; all values are minimum unless shown as a range.
Available Coating & Surface Treatments
Black Paint / Varnish
Standard coating for structural and scaffolding applications. Provides basic corrosion protection.
Hot-Dip Galvanized
Zinc coating (typical 50–85μm per EN ISO 1461 / EN 10240 / ASTM A53; heavier on request) for superior corrosion resistance. Ideal for outdoor and marine environments.
3PE / FBE Coating
Three-layer polyethylene or fusion bonded epoxy for oil & gas pipelines with harsh conditions.
3PP Coating
Three-layer polypropylene (DIN 30678) for higher service temperatures, offshore pipelines and horizontal directional drilling.
Internal Epoxy Lining
Liquid epoxy lining for the pipe interior in water supply and fire fighting systems (external anti-corrosion is covered by 3PE / FBE above).
Oiled / Bare
Light oil coating or bare finish for applications where further processing will be done.
PVC / PE Coating
Plastic coating for greenhouses, scaffolding frames, and decorative applications.
Packing & Shipping Details
Packing Methods
Packing Methods- Bundles with steel straps
- Wrapped with waterproof plastic woven bag
- Ends protected by plastic caps
- Crates for small diameter pipes
- Custom packing as per buyer requirements
Shipping Information
Shipping Information- MOQ: 5 tons per size
- Delivery: 15–30 days after deposit
- Port: Tianjin / Xingang, China
- Container: 20ft / 40ft GP/HQ
- Payment: T/T, L/C accepted
- Insurance: CIF terms include All Risk
Tip: We offer comprehensive inspection services including mill test certificates (MTC) as per EN 10204 3.1/3.2, third-party inspection (SGS, BV, TUV), and full traceability documentation.
Manufacturing Process
High-Frequency Electric Resistance Welding (ERW) process for manufacturing precision steel pipes with excellent weld integrity.
Raw Material Inspection
Inspect steel coil composition, mechanical properties, surface and dimensions to meet production standards.
Uncoiling
Unfold steel coils and continuously feed flat steel strip into the production line.
Strip End Cutting & Butt Welding
Trim strip ends and weld strips together to ensure continuous production.
Strip Leveling
Level the steel strip to eliminate deformation and internal stress for smooth forming.
Edge Trimming
Trim strip edges to ensure uniform width and neat edges for stable welding.
Strip Forming
Gradually bend flat steel strip into tubular blank through forming rollers.
High Frequency Induction Welding
Heat strip edges by high-frequency current and squeeze to form tight weld seams.
Weld Bead Removal (Internal & External Scarfing)
Remove excess inner and outer weld beads to obtain smooth pipe surface.
Online Heat Treatment
Treat welds and pipe body to eliminate welding stress and improve mechanical performance.
Online Cooling
Cool high-temperature welded pipes rapidly to stabilize metal structure.
Sizing & Straightening
Calibrate pipe diameter and straighten pipes to eliminate ovality and bending.
Flying Saw Cutting to Fixed Length
Cut continuous pipes into specified fixed lengths via flying saw.
Pipe End Deburring
Remove sharp burrs from pipe ends to avoid usage and assembly defects.
Hydraulic Pressure Test
Perform water pressure test to check pipe and weld tightness and pressure resistance.
Ultrasonic / Eddy Current Nondestructive Testing
Detect internal and welding defects of pipes without damage.
Surface Inspection
Visually check pipe surface for scratches, pits and other appearance defects.
Pipe End Facing & Chamfering
Machine and chamfer pipe ends for convenient on-site welding installation.
Marking
Print specifications, batch and production information on pipe surface.
Anti-rust Treatment (Optional)
Apply anti-rust oil or coating to prevent pipe oxidation and corrosion.
Packaging & Stacking
Bundle qualified pipes and stack them neatly for storage and transportation.
Finished Product Storage & Delivery
Store qualified finished pipes and arrange delivery according to orders.
Applications
Where our products deliver proven performance across industries worldwide.
Structural & Construction Tubing
ERW square, rectangular and round tubes frame steel buildings, scaffolding, greenhouses, and roof trusses, where consistent dimensions and tight tolerances speed fabrication.
✓ EN 10219 / ASTM A500 Gr.B/C
Line Pipe & OCTG Casing
High-frequency welded ERW line pipe carries onshore oil and gas at moderate pressures, and ERW casing/tubing serves shallow to medium wells — the highest-volume welded pipe category worldwide.
✓ API 5L Gr.B–X70, API 5CT J55–N80
Mechanical & Precision Tubing
Cold-drawn and precision ERW tube feeds hydraulic cylinders, shock absorbers, drive shafts and mechanical components that demand tight OD/ID tolerances and clean surfaces.
✓ EN 10305 / ASTM A513
Automotive Components
ERW tube forms exhaust systems, chassis members, drive shafts and structural crash members, benefiting from high strength-to-weight and consistent weld quality.
✓ Automotive-grade low-alloy steels
Boiler, Heat-Exchanger & Energy Tubing
ERW boiler and heat-exchanger tubes serve industrial boilers and heat-recovery units, with hydro and eddy-current testing qualifying every length.
✓ ASME / EN 10216-2 equivalents
General Fabrication & Fencing
Fencing, gates, furniture tube, conduit and general fabrication consume ERW in the widest variety of small sizes and thin walls, where low cost per meter is key.
✓ ASTM A53 Type E, EN 10255
Frequently Asked Questions
What is ERW steel pipe?＋
ERW (Electric Resistance Welded) pipe is made by cold-forming steel strip into a tube and welding the longitudinal seam using electric resistance heat — no filler metal — producing a clean, consistent, economical weld.
What standards does your ERW pipe comply with?＋
We produce to API 5L PSL1/PSL2, API 5CT, ASTM A53/A135/A500/A513, EN 10219/10217 and GB/T 3091, with mill test certificates for every order.
What is the size range of ERW pipe?＋
Typically 21.3 mm to 660 mm (½"–26") OD, wall thickness 1.0–16 mm, in round, square and rectangular sections, lengths up to 18 m.
How is modern ERW weld quality assured?＋
The weld zone is normalized by induction heat treatment, then 100% ultrasonic-tested; severed ends are hydro-tested and the weld seam is visually and eddy-current inspected.
ERW vs seamless pipe — when is ERW the right choice?＋
For operating pressures within ERW ratings, ERW is more economical, has tighter dimensional tolerances and a thinner uniform wall. Seamless is preferred for the highest pressures and thick walls.
Can ERW pipe be used for oil and gas pipelines?＋
Yes. Modern ERW line pipe to API 5L PSL2 (up to X70) with full-body heat treatment is widely used in onshore gathering and transmission pipelines at moderate pressures.
What surface finishes and coatings are available?＋
Bare, black varnish, hot-dip galvanized, FBE, 3PE/3PP, and liquid epoxy — applied in-house with single-source quality control.
What is the minimum order quantity and lead time?＋
MOQ is typically 50 tons per size; standard sizes often ship within 2–4 weeks. Contact us for a firm quotation and schedule.
How do you control weld seam quality on each joint?＋
Every pipe passes online ultrasonic weld inspection, eddy-current testing, hydrostatic pressure test, and weld seam normalizing verification, with records kept per heat.
What documentation comes with my order?＋
EN 10204 3.1 mill test certificates, hydro test and NDT records, heat traceability, and coating QC reports; third-party inspection available on request.
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