Description
Vertically Integrated ERW Pipe Mill — Direct supply from own steel production facility with 3 production lines and 2,800+ raw material specifications, eliminating third-party sourcing gaps for Q235, S355JR, and ASTM A53 grades.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ERW Round Steel Pipe |
| Product Type | ERW Welded Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, SS400, St37, St52, ASTM A36, ASTM A53, ASTM A106, ASTM A500 |
| Standard | GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083, API, CE, ISO 9001 |
| Section Shape | Round |
| Size Range | 10–1000 mm outer diameter |
| Wall Thickness | 1–80 mm |
| Length | 1–12 m (customizable) |
| Technique | ERW / Hot Rolled |
| Surface Treatment | Hot Rolled / Oiled / Non-oiled / Consumer’s Requirement |
| Tolerance | ±1% |
| Ends | Plain / Beveled (as required) |
| Application | Fluid delivery / Chemical fertilizer pipelines / Hydraulic systems / Drill pipes / Boiler tubes / Construction structural pipe / Greenhouse structures / Fence posts / Curtain walls / Machinery parts |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas / Petrochemical | Fluid delivery pipelines for water, gas, and oil transport; chemical fertilizer distribution lines |
| Industrial Construction | Greenhouse frame structures, fence post systems, curtain wall support members |
| Machinery & Equipment | Hydraulic system piping, drill pipes, boiler tubes, machinery part fabrication |
| EPC / Infrastructure | Plant piping networks, structural columns and beams for industrial facilities |
What Dimensional Tolerance Costs on a Pipeline Fabrication Order
A ±1% tolerance on outer diameter and wall thickness prevents costly field rework when pipes must be welded into pressure-rated assemblies.
Procurement teams sourcing ERW round steel pipe from overseas often discover that dimensional deviations compound at the welding stage — beveled ends that do not align, mismatched wall thickness at joint connections, and oversized OD that fails to fit pre-fabricated flanges. These issues trace back to fragmented sourcing where the fabricator has no control over raw material quality. When the mill and fabrication operate under one roof, material traceability runs from billet to finished pipe, and tolerance consistency becomes a production standard rather than an inspection gamble. [NEED_CITE: dimensional tolerance requirements for ERW welded steel pipe in pressure applications]
Matching ERW Round Steel Pipe to Structural and Pipeline Applications
The 10–1000 mm outer diameter range with wall thickness from 1 to 80 mm covers both light structural applications — greenhouse frames, fence posts, curtain wall supports — and heavy-duty industrial piping for hydraulic systems and boiler tubes. For EPC projects requiring ASTM A53 or S355JR grade pipe in large volumes, having an integrated supply chain means the ERW round steel pipe arrives with consistent chemistry across every heat number, which matters when welding procedures must pass third-party qualification testing.
Engineering Compliance and Certification for International Delivery
Structural applications governed by EN 1090 or AISC standards require documented proof that steel grade, welding procedures, and dimensional inspection meet project specifications. Our ERW round steel pipe production follows certified WPS and PQR procedures, with qualified welders holding AWS and EN certifications. For projects entering the EU market, CE marking and EN standard compliance are non-negotiable at customs — missing documentation means container holds and demurrage charges that no amount of price discount can offset. [NEED_CITE: EN 10219 cold-formed hollow section compliance requirements for structural steel]
Steel Grade Selection and ERW Welding Process Explained
The Q-series (Q195, Q235, Q345) follows the Chinese GB standard system, where the number indicates minimum yield strength in MPa. The S-series (S235JR, S275JR, S355JR) follows the European EN standard, and ASTM A36/A53/A106 covers North American specifications. While S235JR and ASTM A36 share similar yield strength ranges, their chemical composition limits and impact testing requirements differ — specifying the wrong equivalence can fail inspection at the port of discharge. The ERW welding process uses high-frequency electric current to fuse the steel strip edges, producing a continuous longitudinal weld seam. Compared to seamless pipe, ERW offers tighter dimensional tolerance and lower cost for non-critical pressure applications; compared to SSAW, ERW provides a straighter weld seam suitable for smaller diameter ranges. Surface treatment options — hot rolled, oiled, or non-oiled — are selected based on the end-use environment and whether further coating (galvanizing, 3PE, painting) will be applied downstream.
Hidden Costs of Sourcing from Unverified Suppliers
Material certificates that cannot be traced to heat numbers, wall thickness that falls below nominal tolerance, and steel grade substitutions without notification — these are the issues that surface during third-party inspection or on-site welding qualification. When an ERW round steel pipe fails to match the specified ASTM A53 chemistry, the entire batch may be rejected, triggering production delays and air-freight replacement costs that dwarf the original price savings. Engineering standards like EN 10219 and ASTM A500 define precise requirements for chemical composition, mechanical properties, and dimensional tolerance — deviation from these standards compromises structural integrity and voids project insurance coverage. [NEED_CITE: material traceability and certification requirements for structural steel pipe]
Why Project Procurement Teams Source from Our Mill
We operate three dedicated ERW production lines backed by our own steel mill, which means we control material quality from billet melting through finished pipe — no third-party steel sourcing, no certificate gaps. Our raw material inventory covers 2,800+ specifications across Q235, S355JR, ASTM A53, and other grades, so project orders do not wait for material procurement from external suppliers. Every ERW round steel pipe leaves our facility with a complete documentation package: mill test certificates tied to heat numbers, dimensional inspection reports, and welding procedure records. We accept third-party inspection from SGS, BV, or client-nominated agencies before shipment, and our loading team has specific protocols for securing small-diameter pipe to prevent transit damage — a lesson learned from early export shipments where improper lashing caused pipe-end deformation during ocean freight.
Documentation & Compliance
- Mill test certificate documenting Q235 and S355JR chemical composition and mechanical properties per GB/T 3091 and EN 10219, traceable to heat number
- CE certificate confirming compliance with EN 10210 and EN 10219 for structural hollow sections entering European markets
- ISO 9001 quality management certificate covering the full production process from raw material inspection to finished pipe packaging
- SGS or BV third-party inspection report available upon request, covering dimensional verification, visual weld inspection, and coating thickness measurement
- Material traceability documentation linking each pipe bundle to its heat number, chemical analysis, and mechanical test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- ERW round steel pipe bundled with steel strips and edge protectors to preserve surface treatment (oiled or hot rolled finish) during ocean transit
- Small-diameter pipe (10–200 mm OD) loaded with pipe-end caps and internal spacers to prevent deformation and protect beveled ends
- Custom length cutting available within the 1–12 m range, with bundles labeled by heat number, steel grade, and dimensional specification
- Professional container loading plans optimized for 20ft and 40ft containers, maximizing payload while securing pipe against transit shift
- FOB, CIF, and DDP shipping terms available, with complete export documentation and tracking until site delivery
How to Initiate Your ERW Round Steel Pipe Inquiry
Share your project drawings, required steel grade (Q235, S355JR, ASTM A53, etc.), outer diameter, wall thickness, length, and destination port — we respond within 24 hours with a detailed quotation including material, fabrication, coating, packing, and shipping costs. For non-standard sizes or custom surface treatment requirements, our engineering team will review specifications and confirm feasibility before production begins.
Start Your ERW Round Steel Pipe Procurement
Submit your specifications and steel grade requirements to receive a quotation with mill test certificate samples and production timeline.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between Q235, S235JR, and ASTM A36 steel grades for ERW round steel pipe?
A: Q235 follows the Chinese GB standard, S235JR follows the European EN standard, and ASTM A36 follows the American ASTM standard. While their yield strength ranges are similar, chemical composition limits and impact testing requirements differ. We provide material equivalence guidance and can supply mill test certificates showing compliance with your specified standard.
Q: Can third-party inspection be arranged before shipment?
A: Yes, we accept third-party inspection from SGS, BV, or client-nominated agencies. Inspection covers dimensional verification, visual weld inspection, surface treatment measurement, and material traceability checks against heat numbers documented in the mill test certificate.
Q: What is the minimum order quantity for custom lengths and non-standard sizes?
A: The minimum order quantity is 1 Ton. Custom lengths within the 1–12 m range and non-standard outer diameter or wall thickness combinations can be produced based on your project drawings. Lead time depends on specification complexity and current production scheduling.
Q: What surface treatment options are available for ERW round steel pipe?
A: Standard options include hot rolled, oiled, and non-oiled finishes. For projects requiring additional corrosion protection, we can coordinate downstream galvanizing, 3PE coating, or custom painting based on your environmental exposure requirements and project specifications.
Q: How do you ensure material traceability from raw steel to finished pipe?
A: As a vertically integrated producer with our own steel mill and ERW production lines, we control the entire process. Each pipe bundle is labeled with its heat number, and the mill test certificate documents chemical composition and mechanical properties traceable to that specific heat. This eliminates gaps that occur when fabricators source steel from third-party suppliers.
