Description
Direct Mill Supply for ERW Round Pipes — Every Carbon Steel ERW Round Steel Pipe we ship carries a heat-number-traceable mill test certificate verified by our in-house laboratory before container loading.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel ERW Round Steel Pipe |
| Product Type | Round Steel Pipe / ERW Pipe |
| Steel Grade | Q195, Q235, Q345, SS400, 10#, 20#, 45#, 16Mn, A53, A106, ST35, ST52, Grade A, Grade B, Grade C |
| Standard | API 5L, ASTM A53, ASTM A106, ASTM A252, 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 |
| 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 |
| Technique | ERW (Hot Rolled / Cold Rolled) |
| Surface Treatment | Hot Rolled / Galvanized (Zinc Coated 200–700 g/m²) / Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard) |
| Application | Fluid transport / Gas pipeline / Oil pipeline / Boiler / Structural support / Construction building material / Hydraulic system / Chemical fertilizer pipeline / Drill pipe |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas EPC | Low-pressure gas distribution lines, fluid transport pipelines, drill pipe casings |
| Construction & Infrastructure | Structural columns, scaffolding uprights, bridge handrail posts, building frame bracing |
| Industrial Machinery | Hydraulic cylinder barrels, conveyor roller tubes, machinery support frames |
| Power & Boiler | Boiler tube bundles, heat exchanger shells, high-pressure steam lines |
| Chemical & Fertilizer | Chemical fertilizer delivery pipelines, corrosive-fluid transfer lines with galvanized protection |
Where Wall-Thickness Tolerance Decides Site Acceptance on a Carbon Steel ERW Round Steel Pipe Order
A ±1% tolerance on a 700 mm OD pipe means the difference between passing ultrasonic inspection and getting the entire container rejected at the port.
I have watched procurement teams celebrate a low unit price, only to face full-batch rejection because the actual wall thickness drifted beyond the allowable negative tolerance. On structural frames, thin-wall sections compromise load capacity; on pressure lines, they trigger failed hydrostatic tests. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections] When mill test certificates fail to match heat numbers, customs officers hold the cargo — and the project timeline collapses.
Matching Carbon Steel ERW Round Steel Pipe to Structural and Pressure Applications
A Carbon Steel ERW Round Steel Pipe selected for structural columns must balance section modulus against dead load, while the same pipe routed through a chemical plant needs galvanized protection rated at 200–700 g/m² to resist atmospheric and splash-zone corrosion. Our ERW welding process produces a consistent weld seam that passes both flattening tests and hydraulic pressure verification — critical for fluid transport lines operating under API 5L or ASTM A106. For boiler and high-pressure steam applications, the 20# and ST35–ST52 grades deliver the thermal stability that hot-rolled ERW processing provides, while Q195 and Q235 serve lighter structural and scaffolding roles where cost efficiency matters more than pressure rating.
Engineering Compliance and Certification Pathways Across Markets
Structural projects in the European Union require EN 10219 or EN 10296 compliance backed by a Lloyd’s CE certificate — without it, the shipment cannot clear customs regardless of physical quality. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10219] North American buyers specify ASTM A53 Grade B or A106 Grade B for pressure service, and the mill test certificate must explicitly reference the correct standard edition. For Middle East and Southeast Asian infrastructure tenders, API 5L line pipe grades and third-party inspection reports from SGS or BV are often mandatory contract clauses. Our in-house physical and chemical laboratory tests every production batch for dimensional accuracy, chemical composition, and mechanical properties before any Carbon Steel ERW Round Steel Pipe leaves the mill floor.
Steel Grade Selection and ERW Process Fundamentals
The Q-series grades (Q195, Q235, Q345) follow the Chinese GB system where the number indicates minimum yield strength in MPa — Q235 is the direct equivalent of S235JR under EN 10219 and roughly matches ASTM A53 Grade A in structural applications. The ASTM A53 and A106 grades serve pressure and high-temperature service, with A106 Grade B being the standard choice for boiler tubes and process piping. ERW welding joins the formed steel strip through high-frequency electric resistance, producing a clean weld seam suitable for diameters from 10 mm to 700 mm — far more cost-effective than seamless for non-critical pressure ranges, while maintaining dimensional consistency that SSAW cannot achieve at smaller diameters. Surface treatment selection depends on the service environment: hot-rolled black finish works for indoor structural use, slight oiling protects during short-term ocean transit, and hot-dip galvanizing at 200–700 g/m² is essential for outdoor or corrosive installations. [NEED_CITE: equivalence mapping between GB Q235, EN S235JR, and ASTM A53 structural grades]
The Hidden Cost of Procuring Without Verified Certification
Ordering a Carbon Steel ERW Round Steel Pipe based on price alone, without requiring a heat-number-traceable mill test certificate, exposes the project to three failure modes: structural members that fail ultrasonic thickness scanning during client inspection, pressure lines that burst during hydrostatic commissioning, and entire shipments detained at destination customs due to missing or non-conforming EN/ASTM documentation. [NEED_CITE: consequences of non-compliant mill test certificates in international steel trade] Re-cutting, re-welding, and re-shipping a rejected container costs multiples of the original unit price savings — and damages the contractor’s reputation with the project owner.
Why Project Procurement Teams Source Carbon Steel ERW Round Steel Pipe From Our Mill
We operate three dedicated ERW production lines covering the full 10–700 mm diameter range and wall thicknesses from 1 mm cold-rolled to 20 mm hot-rolled, eliminating the need to split orders across multiple suppliers. Every Carbon Steel ERW Round Steel Pipe undergoes dimensional, mechanical, and chemical testing in our in-house laboratory before shipment, with results documented on a heat-number-traceable mill test certificate. Our facility holds ISO 9001:2015, Lloyd’s CE certification under EN 10210/EN 10219, and Singapore FPC — covering the documentation requirements for EU, Middle East, and Asian regulated markets. We accept SGS and BV third-party inspection at any production stage, and our export loading team uses purpose-built cradles and edge protectors to prevent ovality deformation and surface damage during container transit. Custom non-standard diameters, wall thicknesses, and cut-to-length services are available with a 1-ton minimum order quantity.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 3091, with heat number traceability for every Carbon Steel ERW Round Steel Pipe
- CE certificate under EN 10219 / EN 10296 for structural hollow section exports to European Union markets
- ISO 9001:2015 quality management certificate covering the full ERW production and testing process
- SGS or BV third-party inspection report available upon request for dimensional verification and witness testing
- API 5L / ASTM A53 / ASTM A106 compliance documentation for oil, gas, and pressure pipeline applications
- Full customs export package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-rolled black Carbon Steel ERW Round Steel Pipe bundled with galvanized steel strips and seaworthy wrapping, sized to match container internal dimensions for 1–12 m lengths
- Galvanized pipes packed with nylon edge protectors and moisture-barrier sheeting to preserve the 200–700 g/m² zinc coating during ocean transit
- Container loading optimized by diameter grouping — small-bore pipes nested inside large-bore sections to maximize payload per 20ft or 40ft container
- Cut-to-length service available for 1–12 m custom lengths, with each piece marked with steel grade, heat number, and size for site identification
- Slightly oiled finish applied for short-term corrosion protection on non-galvanized pipes during transit to humid destinations
- Shipping terms available as FOB, CIF, or DDP with full container tracking until port arrival
Requesting a Quotation for Your Carbon Steel ERW Round Steel Pipe Project
Submit your required outer diameter, wall thickness, steel grade, surface treatment preference, total tonnage, and destination port — we return a detailed quotation with unit pricing, production lead time, and applicable certification within 12 hours. For non-standard dimensions or mixed-grade orders, our engineering team provides a custom production plan with confirmed mill test certificate and third-party inspection arrangements.
Start Your Carbon Steel ERW Round Steel Pipe Inquiry Today
Send your specifications and quantity to receive a factory-direct quotation with full mill test certification and export documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Frequently Asked Questions
Q: How do Q235, A53 Grade B, and S235JR compare across GB, ASTM, and EN standards?
A: Q235 (GB/T 700) is the Chinese standard equivalent to S235JR (EN 10025) for structural applications. ASTM A53 Grade B serves similar structural roles in North American projects, while ASTM A106 Grade B is specified for high-temperature and pressure service. We provide full grade equivalence documentation and can supply Carbon Steel ERW Round Steel Pipe to any of these standards from the same production line.
Q: Can you provide mill test certificates and accept third-party inspection before shipment?
A: Yes. Every Carbon Steel ERW Round Steel Pipe shipment includes a mill test certificate documenting chemical composition and mechanical properties, traceable to the specific heat number. We welcome SGS, BV, or any nominated third-party inspector to verify dimensions, wall thickness, and weld quality at our facility before container loading.
Q: When should I specify hot-dip galvanized versus oiled versus black hot-rolled finish?
A: Hot-dip galvanized finish with 200–700 g/m² zinc coating is required for outdoor exposure, coastal environments, or corrosive atmospheres. Slight oiling provides short-term rust prevention during ocean transit for indoor-use pipes. Black hot-rolled finish is suitable for indoor structural applications or where the pipe will receive additional field coating after installation.
Q: Can you produce non-standard outer diameters or wall thicknesses with a low minimum order?
A: Yes. Our three ERW production lines cover 2,800+ specifications across outer diameters from 10 mm to 700 mm and wall thicknesses from 1 mm to 20 mm. Custom non-standard sizes are available with a 1-ton minimum order quantity, and we provide confirmed production drawings before manufacturing begins.
Q: How do you protect Carbon Steel ERW Round Steel Pipe from damage during container shipping?
A: We use steel strip bundling with nylon edge protectors for galvanized pipes, moisture-barrier wrapping for oiled finishes, and diameter-grouped nesting to maximize container space while preventing ovality deformation. Our loading team documents every container with photos before sealing, and we provide tracking until port arrival.
