Description
Factory-Direct ERW Pipe Pricing — Three dedicated production lines producing Q195 through Q345 and ASTM A53/A500 grades eliminate intermediary markups on every metric ton shipped.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ERW Round Steel Pipe |
| Product Type | ERW Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, SS400, St37, St52, ASTM A53, ASTM A106, ASTM A500, ASTM A36, 20#, 10#, 16Mn |
| Standard | GB/T 3091, GB/T 13912, BS 1387, ASTM A53, ASTM A106, ASTM A500, ASTM F1083, EN 10219, EN 10210, JIS G3466 |
| Section Shape | Round |
| Outer Diameter | 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 1–12 m (customized) |
| Technique | ERW (Electric Resistance Welding) |
| Surface Treatment | Hot Rolled / Oiled / Non-oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded |
| Application | Fluid transport, hydraulic systems, structural pipe, machinery parts |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas / Energy | Small-diameter flowlines, gathering lines, gas distribution headers |
| Construction / EPC | Structural columns, greenhouse frames, curtain wall supports, fence posts |
| Machinery Manufacturing | Hydraulic cylinder barrels, conveyor rollers, drill pipe casings |
| Infrastructure | Water transmission mains, chemical fertilizer transport lines, boiler feed pipes |
What Ovality Tolerance Costs When Small-Diameter ERW Pipe Reaches the Job Site
A ±1% dimensional tolerance on OD and wall thickness is the difference between pipes that weld cleanly and pipes that get rejected at third-party inspection.
When small-diameter ERW round steel pipe arrives at an oil & gas project with ovality exceeding the allowable range, field crews cannot align pipe ends for butt welding. The entire batch must be sorted, re-measured, and in worst cases returned — delaying commissioning schedules and inflating labor costs. Beyond ovality, inconsistent wall thickness across a single heat number creates pressure-rating uncertainty that engineers cannot sign off on. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections]
How This ERW Round Steel Pipe Matches Oil & Gas and Structural Demands
Small-diameter ERW round steel pipe in Q195 through Q345 and ASTM A53 grades covers the pressure and structural requirements common to gathering lines, gas distribution networks, and load-bearing frames. The ±1% tolerance on outer diameter and wall thickness ensures that field welding, threading, and grooving proceed without rework. For corrosive service environments, the oiled surface treatment provides transit protection, while hot-rolled finish suits applications where downstream coating or galvanizing will be applied on site.
Engineering Compliance and Certification Requirements
Structural applications governed by EN 1993 or AISC specifications require documented proof that steel grade, chemical composition, and mechanical properties conform to the declared standard. ERW round steel pipe produced under EN 10219 or ASTM A500 must carry mill test certificates traceable to heat numbers — without them, customs authorities in the EU and North America will hold shipments at port. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10210] For oil & gas pipelines, ASTM A53 and A106 compliance determines whether the pipe can be hydrostatically tested and commissioned under ASME B31.3. Custom cut-to-length service eliminates secondary cutting at the fabrication yard, reducing material waste and maintaining dimensional integrity at the weld prep stage.
Steel Grade Selection and ERW Welding Process Explained
The Q-series grades (Q195, Q235, Q345) follow Chinese GB standards where the number indicates minimum yield strength in MPa — Q345 offers roughly 50% higher yield than Q195, making it the default choice for load-bearing structural frames. European S-series grades (S235JR, S275JR, S355JR) and American ASTM grades (A53, A500, A106) serve equivalent functions in their respective markets, and grade equivalence tables allow substitution when local supply chains require it. [NEED_CITE: steel grade equivalence between GB, EN, and ASTM standards]
ERW welding uses high-frequency electric current to fuse the steel strip edges without filler metal, producing a clean weld seam suited for low-to-medium pressure applications up to moderate diameters. Compared to seamless pipe, ERW offers lower cost and tighter dimensional tolerance on wall thickness; compared to SSAW, ERW provides superior surface finish and more consistent weld integrity on small-diameter ranges. The hot-rolled surface condition with optional oiling balances corrosion protection during ocean transit against the need for clean weld prep at the fabrication stage.
Hidden Costs of Procuring the Wrong Grade or Missing Certification
Specifying a lower steel grade than the engineering design requires may pass initial cost review but fails structural load calculations during third-party inspection — forcing complete pipe replacement at multiples of the original material cost. Missing or incomplete mill test certificates trigger customs holds in EU and Middle Eastern ports, where CE marking under EN 10219 or EN 10210 is mandatory for structural hollow sections. [NEED_CITE: customs documentation requirements for steel pipe imports into EU member states] Wall thickness below the declared negative tolerance reduces pressure rating and structural capacity, creating latent safety risks that surface only after commissioning — at which point remediation costs include pipeline shutdown, excavation, and re-welding.
Why Global Buyers Source ERW Round Steel Pipe From Our Mill
Three dedicated ERW production lines cover the full 10–1000 mm OD and 1–80 mm wall thickness range, meaning a single purchase order consolidates small-diameter flowlines and large-diameter structural pipe without splitting shipments across multiple suppliers. An in-house physical and chemical laboratory tests every heat number for composition, yield strength, and dimensional accuracy before release — the mill test certificate travels with the cargo, not as an afterthought. Forty-one invention patents include proprietary welding and forming technologies that maintain the ±1% tolerance across the entire specification range. ISO 9001:2015, Lloyd’s Register EU CE (EN 10210/EN 10219), Singapore FPC, and SGS/BV third-party verification satisfy procurement compliance requirements across 50+ export markets. Professional container loading plans optimize stowage for mixed-diameter orders, reducing freight cost per ton and preventing transit damage to pipe ends.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and yield strength per GB/T 3091 or EN 10219
- CE certificate confirming EN 10210/EN 10219 compliance for structural hollow sections entering EU markets
- ISO 9001:2015 quality management certificate covering production, inspection, and traceability processes
- SGS or BV third-party inspection report verifying dimensional tolerance, surface condition, and weld integrity
- Full material traceability by heat number linking each pipe to its mill test certificate and production batch
- Export customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW round steel pipe bundled with steel strips and edge protectors to preserve oiled surface finish during ocean transit
- Mixed-diameter container loading plans optimized for 1–12 m lengths to maximize cubic utilization and prevent pipe-end deformation
- Heat number and steel grade stenciled on each pipe bundle for on-site identification and MTC cross-referencing
- Custom cut-to-length service available within the 1–12 m range, eliminating field cutting waste at the fabrication yard
- FOB, CIF, and DDP shipping terms with door-to-door logistics coordination to 50+ countries
- Beveled or threaded end preparation completed at the mill per customer drawing, reducing on-site weld prep labor
Ready to Lock In Pricing and Mill Test Certificates
Submit your specification sheet — outer diameter, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation with production lead time, applicable certifications, and mill test certificate confirmation within 12 hours. Non-standard dimensions and custom end treatments are quoted separately with engineering drawings reviewed before production release.
Request Your ERW Round Steel Pipe Quotation
Send specifications via email or WhatsApp to receive pricing, MTC samples, and container loading plans.
Email: admin@sdxjysteel.com
Mobile/WhatsApp: +86 188 5315 7756
Frequently Asked Questions
Q: Can you supply ERW round steel pipe in both ASTM A53 and EN 10219 standards for the same project?
A: Yes. Our production lines cover ASTM A53, A106, A500 for North American projects and EN 10219, EN 10210 for European specifications. Steel grade equivalence tables are provided with each quotation to confirm compliance with your engineering design.
Q: What documentation accompanies each shipment for customs clearance?
A: Every shipment includes mill test certificates traceable by heat number, CE certificates for EU-bound cargo, packing lists, bills of lading, and certificates of origin. SGS or BV third-party inspection reports are available upon request for projects requiring independent verification.
Q: What is the minimum order quantity for non-standard outer diameters or wall thicknesses?
A: The standard MOQ is 1 Ton. Custom non-standard dimensions outside the 10–1000 mm OD and 1–80 mm wall thickness range are reviewed case by case, with production feasibility confirmed before order placement.
Q: How do you ensure dimensional accuracy on small-diameter ERW pipe?
A: Every production batch undergoes incoming, in-process, and final inspection in our in-house physical and chemical laboratory. Outer diameter, wall thickness, and ovality are measured against the ±1% tolerance before release, with results documented in the mill test certificate.
Q: Can you provide beveled or threaded ends for oil & gas pipeline applications?
A: Yes. Plain, beveled, and threaded end treatments are available per customer specification. End preparation is completed at the mill to reduce field weld prep labor and maintain dimensional integrity at the joint.
