Description
Factory-Direct ERW Round Pipe Supply — Every batch of Q235 Q345 ERW round steel pipe ships with original mill test certificates and ships from our own production lines in Jinan, no trading company markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 / Q345 / SS400 ERW Round Steel Pipe |
| Product Type | ERW Round Steel Pipe (Circular Hollow Section) |
| Steel Grade | Q195, Q235, Q345 (Q355), SS400, 10#, 20#, 45#, 16Mn, ST35–ST52, Grade A/B/C, ASTM A53–A369 |
| 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, JIS G3466 |
| 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) |
| Technique | ERW (Hot Rolled / Cold Rolled / Cold Drawn) |
| Surface Treatment | Hot Rolled, Slightly Oiled; Hot Dip Galvanized (Zinc Coated 200–700 g/m²) |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard or client requirement) |
| Application | Fluid transport / Structural frames / Scaffolding / Construction building material / Boiler & heat exchanger / Machinery & equipment manufacturing / Fencing & greenhouse |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Scaffolding tubes, structural columns, piling supports, building frames |
| Fluid & Energy Transport | Oil, gas, and water pipelines, boiler tubes, hydraulic systems |
| Machinery & Industrial Equipment | Equipment frames, conveyor structures, greenhouse frames, fencing systems |
Mixing Steel Grades in One Container Saves More Than Freight
Buying Q235 and Q345 from separate suppliers means double the paperwork, double the inspection cost, and double the risk of certificate mismatch at customs.
Project buyers often need ASTM A106 A53 ERW carbon steel round pipe in multiple grades for different structural zones — higher yield for load-bearing columns, lower cost grades for non-critical bracing. Sourcing each grade from a different mill or trader fragments the order, delays consolidation, and creates traceability gaps when the engineer asks which heat number belongs to which pipe [NEED_CITE: steel grade equivalence between EN and ASTM standards]. We produce Q195 through Q345, ST35–ST52, and ASTM A53/A106 equivalents on the same ERW lines, so one mill test certificate set covers the entire mixed-grade container.
Matching Wall Thickness and Diameter to Structural Load Paths
The OD 10–700 mm range with wall thickness from 1 mm cold rolled to 20 mm hot rolled lets engineers specify ASTM A106 A53 ERW carbon steel round pipe for both light gauge scaffolding and heavy-wall pressure conduits within a single procurement package. Cold rolled thin-wall sections serve non-structural cladding supports and greenhouse frames where weight matters; hot rolled thick-wall pipes handle fluid transport under pressure and structural piling where collapse resistance is non-negotiable. The ±1% tolerance on both OD and wall thickness keeps fit-up consistent on site — no reaming, no grinding, no field modifications that void the engineer’s load calculation.
Compliance Requirements Across Export Markets
European projects demand CE certification per EN 10210 and EN 10219; North American specs call for ASTM A53 or A106 compliance; Middle East infrastructure tenders often reference API 5L for pipeline-grade material [NEED_CITE: EN 10219 cold-formed hollow section requirements]. Our ERW round pipes carry ISO 9001:2015 quality management certification and Lloyd’s CE (EN 10210/10219) product certification, with every heat number traceable back to the original slab chemistry. For buyers shipping to regulated markets, having the correct standard designation on the mill test certificate is the difference between smooth customs clearance and a two-week port hold.
Understanding ERW Process and Steel Grade Selection
ERW (Electric Resistance Welded) pipe is formed by rolling steel strip into a cylinder and welding the seam through electrical resistance heat — no filler metal, no flux, and a weld zone that undergoes post-weld heat treatment to match base metal properties. For ASTM A106 A53 ERW carbon steel round pipe, this process suits outer diameters from 10 mm up to 700 mm at lower cost than seamless, while maintaining sufficient pressure integrity for water, gas, and low-to-medium pressure oil transport. Steel grade selection directly affects load capacity: Q235 provides adequate strength for general structural framing, while Q345 (Q355) delivers higher yield for columns and beam-column joints where deflection limits are tight [NEED_CITE: structural steel grade selection for load-bearing applications]. Hot dip galvanizing at 200–700 g/m² zinc coating extends service life in corrosive environments — coastal construction, chemical plant scaffolding, agricultural greenhouse frames — where black oiled pipe would rust within a single season.
The Real Cost of Skipping Mill Test Certificates
A container of round pipe without proper documentation does not just fail inspection — it fails the entire project audit trail. Engineers cannot sign off on structural connections without verified chemistry and mechanical test data; customs authorities in the EU and Middle East increasingly reject steel shipments lacking CE marks or traceable heat numbers [NEED_CITE: steel import documentation requirements for customs clearance]. Pipes with wall thickness below the specified tolerance look identical on the outside but carry reduced load capacity, creating latent structural risk that surfaces only after installation. The cost of re-inspection, re-shipment, or on-site reinforcement always exceeds the price difference between certified and uncertified material.
Why Bulk Buyers Source ERW Round Pipe From Our Jinan Facility
We run three ERW production lines simultaneously in Jinan, producing ASTM A106 A53 ERW carbon steel round pipe in Q195 through Q345 and equivalent international grades — factory-direct pricing with no trading company margin added. Our in-house理化实验室 tests every heat for chemical composition and mechanical properties before the pipe leaves the mill, and original mill test certificates ship with each batch, fully traceable by heat number. Buyers ordering mixed-size containers benefit from our professional loading team’s container optimization — we calculate weight distribution and nesting for OD combinations from 10 mm to 700 mm to maximize payload per 40-foot container. SGS and BV third-party inspection is available on request before loading, covering dimensional verification, weld seam testing, and zinc coating thickness measurement. Custom lengths up to 12 m, beveled ends per drawing, and non-standard wall thickness orders are produced within typical lead times, with flexible MOQ starting from 1 ton for trial orders.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 3091 and ASTM A53, traceable to original heat number
- CE certificate per EN 10210 / EN 10219 for hot-finished and cold-formed hollow sections, required for European market customs clearance
- ISO 9001:2015 quality management system certificate covering the full ERW production process from raw material incoming to final shipment
- SGS or BV third-party inspection report available on request, covering OD/wall thickness measurement, weld seam ultrasonic testing, and galvanized coating weight verification
- Material traceability documentation linking each pipe bundle to its heat number, steel grade, and production date
- Complete customs document package including packing list, bill of lading, and certificate of origin formatted per destination country requirements
Packaging, Loading & Delivery
- ERW round pipes bundled with galvanized steel strips at intervals suited to the 6 m / 6.4 m / 12 m length, with seaworthy packaging for ocean freight
- Hot dip galvanized pipes packed with edge protectors and plastic wrapping to preserve the 200–700 g/m² zinc coating during transit and handling
- Container loading plans optimized for mixed OD orders from 10 mm to 700 mm, nesting smaller diameters inside larger sections to maximize weight per 40-foot container
- Custom cut-to-length service available for orders requiring non-standard lengths within the 1–12 m range, with bundle labeling showing exact piece count and weight
- Heat number and steel grade stenciled on each pipe end, with bundle tags matching the mill test certificate for on-site verification
- FOB, CIF, and DDP shipping terms available from Qingdao port with professional export documentation handling
Getting Your Quote for ERW Round Pipe
Send your specification sheet — OD, wall thickness, steel grade, quantity, and destination port — and receive a competitive bulk quotation within 12 hours, including volume discount tiers and mill test certificate confirmation. For non-standard sizes or custom surface treatment requirements, our engineering team provides a technical review and production feasibility assessment before quoting.
Request Your Factory-Direct ERW Pipe Quotation
Submit your specifications via email or WhatsApp to receive pricing, available stock confirmation, and sample mill test certificates for your project review.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Website: www.sdxinjiyuan.com
Frequently Asked Questions
Q: How do Q235 and Q345 steel grades map to ASTM A53/A106 and EN 10219 equivalents?
A: Q235 corresponds roughly to ASTM A53 Grade A and EN 10219 S235JR in yield strength range; Q345 (Q355) aligns with ASTM A53 Grade B and EN 10219 S355JO. We supply all three standard systems from the same ERW lines and provide cross-reference documentation on the mill test certificate for your engineer’s approval.
Q: What certificates are included with each shipment, and can third-party inspection be arranged?
A: Every batch ships with an original mill test certificate showing chemical composition and mechanical properties traceable to heat number. ISO 9001 and CE (EN 10210/EN 10219) certificates are available for download. SGS or BV third-party inspection can be arranged before loading to verify dimensions, weld quality, and coating thickness.
Q: What is the minimum order for non-standard outer diameter or wall thickness?
A: MOQ starts from 1 ton for standard specifications from ready stock. Custom non-standard OD or wall thickness orders are produced on our ERW lines with typical production lead times, and we support split shipments for large projects requiring phased delivery.
Q: When should I specify hot dip galvanized versus black oiled surface treatment?
A: Hot dip galvanized with 200–700 g/m² zinc coating is recommended for outdoor, coastal, or high-humidity environments where corrosion resistance extends service life significantly. Black oiled (hot rolled) finish suits indoor structural applications, underground installations with separate corrosion protection, or projects where field welding is required and zinc fumes are a concern.
Q: How are mixed-size round pipe orders loaded into containers to reduce freight cost?
A: Our loading team calculates nesting combinations for OD ranges from 10 mm to 700 mm, fitting smaller pipes inside larger sections and distributing weight to maximize payload per 40-foot container. Professional lashing and bracing prevent shifting during ocean transit, and loading photos are provided before container sealing.
