Description
Factory-direct ERW welded round steel pipe — produced on dedicated lines with ±1% dimensional tolerance and full mill test certification covering Q195–Q345 and ASTM/EN/API equivalents.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q195-Q345 ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, 10#, 20#, 45#, 16Mn, ASTM A53, ASTM A106, ASTM A252, ASTM A450, ASTM A523, ASTM A671, API 5L, ST35, ST52 |
| Standard | API 5L, ASTM A53, ASTM A106, ASTM A252, ASTM A450, ASTM A523, ASTM A671, ASME B36.10M, BS 1387, BS EN 10219, BS EN 10296, BS 6323, BS 6363, GB/T 3091, GB/T 13793, GB/T 9711, GB/T 8163 |
| Section Shape | Round |
| Size Range | Outer Diameter 10–700 mm |
| Wall Thickness | Cold rolled 1–4.0 mm; Hot rolled 4–20 mm |
| Length | 1–12 m (standard 6 m / 6.4 m / 12 m available) |
| Technique | ERW / Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Oiled / Non-oiled / Black |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard or client requirement) |
| Application | Fluid transport / Structural construction / Scaffolding / Fencing / Machinery / Greenhouse / Industrial piping |
| MOQ | 28 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & EPC | Building structural frames, scaffolding systems, piling supports for bridges and infrastructure |
| Industrial Machinery | Hydraulic cylinder barrels, conveyor rollers, machine base frames |
| Energy & Utilities | Fluid and gas transport piping, water supply networks, solar mounting structures |
| Agriculture & Greenhouse | Greenhouse structural framing, irrigation pipelines, fencing posts |
| Belt & Road Infrastructure | Highway guardrail posts, drainage culverts, telecom tower masts |
Where Grade Equivalence Errors Block EU Customs Clearance
Mismatched steel grade documentation is the single most common reason ERW welded round steel pipe shipments get held at European ports.
Buyers sourcing Q235 or Q345 pipes for projects that specify EN 10219 S235JR or S355JR frequently discover — after the container arrives — that the mill test certificate references GB/T 3091 without a recognized equivalence statement. Customs authorities in EU member states require CE marking under EN 10219 or EN 10210, and a certificate that only cites Chinese national standards will not clear. The result is warehouse detention, re-testing costs, or outright rejection. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections certification requirements]
Beyond documentation, inconsistent wall thickness tolerance across mixed-size orders creates on-site fitting problems. When a single shipment contains pipes from multiple production batches with varying negative tolerance, contractors face re-cutting delays and wasted material on structural joints.
How This ERW Round Pipe Matches Structural and Fluid Transport Requirements
The Q195–Q345 ERW welded round steel pipe covers outer diameters from 10 mm to 700 mm with wall thicknesses spanning 1 mm cold-rolled precision to 20 mm hot-rolled structural grade. For scaffolding and greenhouse framing, the cold-rolled range delivers tight dimensional control at lower weight. For piling and heavy structural columns, the hot-rolled 4–20 mm wall range meets load-bearing demands without stepping up to seamless pricing. Our in-house physical and chemical laboratory tests every heat number before dispatch, ensuring that the Q345 you ordered actually meets Q345 mechanical requirements — not a downgraded substitute.
Engineering Compliance and Certification Pathways
Structural applications under EN 1993 or AISC frameworks require documented proof that the steel grade conforms to the specified standard. Our Q235 and Q345 pipes are produced to GB/T 3091 and GB/T 9711, with full equivalence mapping available for S235JR/S355JR under EN 10219 and ASTM A53 Grade B under ASME B36.10M. For EU-bound shipments, CE certification under EN 10210 and EN 10219 is provided as standard, not as an afterthought. Surface treatment selection — oiled for short-term corrosion protection during transit, or black finish for subsequent galvanizing or painting at destination — is confirmed at the order stage to avoid on-site rework. [NEED_CITE: steel grade equivalence mapping between GB ASTM and EN standards]
Understanding ERW Welding and Steel Grade Selection
ERW (Electric Resistance Welded) pipe is formed by rolling steel strip into a cylindrical shape and fusing the seam through electrical resistance heat without filler metal. This process produces a consistent weld seam suitable for structural and low-to-medium pressure fluid applications. For Q195 and Q235 grades, ERW offers cost efficiency with adequate strength for scaffolding, fencing, and general structural use. Q345 and 16Mn grades provide higher yield strength for load-bearing columns and machinery frames. The cold-rolled 1–4 mm wall range serves precision applications where dimensional accuracy matters, while hot-rolled 4–20 mm walls handle heavier structural demands. Wall thickness tolerance is held to ±1%, verified by ultrasonic measurement at multiple points along each pipe length. [NEED_CITE: ERW welded steel pipe manufacturing process and quality control]
The Hidden Cost of Unverified Tolerance and Missing Certification
Ordering ERW welded round steel pipe based on price alone, without verified mill test certificates and third-party inspection, exposes projects to material rejection at destination. Pipes with excessive negative tolerance arrive lighter than invoiced weight, triggering disputes and re-order delays. Missing CE documentation blocks EU customs clearance, forcing air-freight of replacement materials or project timeline extensions. In structural applications, unverified steel grade substitutions compromise load-bearing capacity and create safety liability. These costs — measured in delayed openings, re-fabrication, and contractual penalties — far exceed the marginal price difference between verified and unverified supply. [NEED_CITE: consequences of non-compliant steel pipe imports in regulated markets]
Why Procurement Teams Source This Pipe From Us
We operate three dedicated ERW production lines covering over 2,800 specifications in round, square, and rectangular profiles — meaning your 219 mm × 8 mm Q345 order ships from existing stock or enters a short production queue, not a backlogged shared line. Our in-house physical and chemical laboratory performs dimensional, mechanical, and chemical testing on every heat number before release, with full mill test certificates issued per shipment. We hold ISO 9001:2015, Lloyd’s CE certification under EN 10210 and EN 10219, and Singapore FPC — eliminating certification gaps for EU, Middle East, and Southeast Asian markets. Third-party inspection by SGS or BV is arranged at any production stage upon request. Professional container loading with anti-damage measures prevents bending and surface scratches during ocean transit, a detail that matters when 12-meter pipes arrive at a Dubai construction site. We are a designated supplier for major Chinese state-owned enterprises and listed companies, exporting to over 50 countries with complete export documentation and tracking until arrival.
Documentation & Compliance
- Mill test certificate documenting Q195/Q235/Q345 chemical composition and mechanical properties per GB/T 3091 or GB/T 9711, issued by heat number
- CE certificate confirming compliance with EN 10219 cold-formed welded structural hollow sections or EN 10210 for EU market customs clearance
- ISO 9001:2015 quality management system certificate covering ERW welded round steel pipe production
- SGS or BV third-party inspection report available at pre-production, in-process, or pre-shipment stages
- Material traceability by heat number linking each pipe to its original steel coil and test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q195–Q345 ERW welded round steel pipe bundled with steel strips and seaworthy packaging, sized for 6 m or 12 m standard lengths to optimize container space
- Oiled surface treatment applied to black finish pipes to prevent rust during ocean transit; non-oiled option available for immediate galvanizing at destination
- Container loading optimized by outer diameter grouping — small-bore 10–48 mm pipes nested for maximum cubic utilization, large-bore 219–700 mm pipes secured with timber chocks to prevent rolling
- Custom cutting to non-standard lengths available within the 1–12 m range, with cut ends deburred and marked per client specification
- Heat number and steel grade stenciled on each pipe for on-site traceability and inspection verification
- Shipping terms FOB, CIF, or DDP to over 50 countries with full tracking and professional loading supervision
Start Your Procurement With Verified Specifications
Submit your required outer diameter, wall thickness, steel grade, quantity, and destination port to receive a detailed quotation including unit price, production lead time, and shipping terms. We will provide mill test certificate samples and CE documentation for your review before contract signing. For non-standard sizes or custom lengths outside the 1–12 m range, our technical team will confirm feasibility and MOQ within 12 hours.
Request Your Quotation and Mill Test Certificate
Send your specifications to admin@sdxjypipe.com or contact us via WhatsApp at +86 188 5315 7756. Our team responds within 12 hours with pricing, certification confirmation, and estimated delivery schedule.
