Description
Factory-Direct ERW Pipe Supply — Shandong Xin Jiyuan operates three dedicated ERW lines producing Q235 Q345 A36 ERW welded round steel pipe in OD 6–1820 mm with original mill test certificates on every heat.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 A36 ERW Welded Round Steel Pipe |
| Product Type | Round Steel Pipe (ERW Welded) |
| Steel Grade | Q195, Q235, Q345, Q355, A36, S355, 10#, 20#, 45#, 16Mn, A53, A106, ST35, ST52 |
| Standard | ASTM A53, ASTM A106, ASTM A252, ASTM A500, API 5L, GB/T 3091, GB/T 13793, GB/T 9711, EN 10219, BS 1387 |
| Section Shape | Round |
| Outer Diameter | 6–1820 mm |
| Wall Thickness | 1–20 mm (Cold rolled: 1–4 mm; Hot rolled: 4–20 mm) |
| Length | 1–12 m |
| Technique | ERW / Hot Rolled |
| Surface Treatment | Oiled / Black / Hot Rolled |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Fluid transport, Gas pipeline, Oil pipeline, Boiler, Hydraulic system, Structural engineering, Construction, Machinery |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Transmission | Low-pressure gas distribution lines, water injection pipelines, metering skid piping |
| Civil Construction | Building column casings, scaffolding uprights, purlin supports, pile sleeves |
| Municipal Infrastructure | Urban water supply mains, drainage culverts, fire-fighting riser pipes |
| Industrial Machinery | Hydraulic cylinder barrels, conveyor roller shells, equipment frame tubing |
| Energy & Power | Boiler feed lines, heat exchanger shells, wind turbine internal conduits |
What Wall-Thickness Tolerance Actually Costs on a Structural Frame Order
A ±1% tolerance on a 1820 mm OD pipe is the difference between a clean fit-up and a forty-day rework cycle at port.
Global buyers sourcing Q235 Q345 A36 ERW welded round steel pipe from fragmented suppliers routinely face wall thickness readings hovering at the lower limit — or slipping below it. Two pipes out of a full container fail third-party复检, and the entire lot gets held at Jebel Ali or Laem Chabang. Cutting, re-welding, re-issuing certificates: the real cost is never the steel price, it is the schedule delay and the reputational damage with the end client. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections]
Matching OD Range and Grade to Structural Load Paths
The 6–1820 mm outer diameter band covers everything from small-bore hydraulic lines to large-diameter pile casings. For structural columns and scaffolding, Q235 and Q345 deliver adequate yield capacity at lower cost; for pressure-rated fluid transport, A53 and A106 grades meet ASTM requirements for elevated-temperature service. The ERW process produces a consistent longitudinal weld seam suitable for low-to-medium pressure applications, while hot-rolled wall thickness (4–20 mm) handles heavier structural loads without secondary forming. Each Q235 Q345 A36 ERW welded round steel pipe leaves our mill with heat-number traceability from coil to finished length.
Engineering Compliance and Certification Requirements
Structural frames designed to EN 1993 or AISC specifications require documented grade equivalence and traceable mechanical properties. Q235 maps broadly to S235JR under EN standards; Q345 aligns with S355JR; A36 serves North American projects under ASTM A36. For European customs clearance, CE certification per EN 10210 or EN 10219 is mandatory — missing paperwork means cargo held at port, regardless of physical quality. [NEED_CITE: steel grade equivalence mapping between GB, ASTM, and EN standards] Plain ends arrive ready for site welding or mechanical coupling, and standard 1–12 m lengths reduce field cutting waste on high-rise projects.
Understanding Grade Systems and ERW Weld Integrity
Chinese Q-series grades (Q195 through Q355) designate minimum yield strength in MPa; American A-series (A36, A53, A106) follows ASTM chemical and mechanical tables; European S-series (S355) conforms to EN 10025. The ERW welding process forms the pipe from hot-rolled coil through continuous forming and high-frequency electric resistance welding, producing a clean longitudinal seam without filler metal. This method suits large-diameter, thin-to-medium wall applications where cost efficiency matters more than seamless construction. Surface treatment options — oiled for transit protection, black for indoor structural use, or hot-rolled finish for further coating — depend on end-use environment and downstream fabrication plans. [NEED_CITE: ERW versus seamless pipe manufacturing process comparison]
The Hidden Price of Incorrect Grade Selection or Missing Documentation
Specifying Q235 when the engineer calls for Q345 means the structure fails load testing; shipping A36 material with only a commercial invoice instead of a mill test certificate means customs rejection in the EU. Negative tolerance beyond ±1% reduces actual weight per meter, triggering client disputes and potential structural recalculation. The cost of re-inspection, re-certification, or replacement cargo — plus demurrage and schedule penalties — dwarfs the original material savings from choosing the lowest bidder without verification. [NEED_CITE: consequences of non-compliant steel material certification in international construction projects]
Why Project Buyers Source Q235 Q345 A36 ERW Welded Round Steel Pipe Through Xin Jiyuan
We run three ERW production lines simultaneously, delivering monthly capacity exceeding 20,000 tons with factory-direct pricing — no trading company margin layered on. Every heat carries an original mill test certificate showing full chemical composition and mechanical test results; SGS or BV third-party inspection is available before container sealing. Our inventory covers 2,800+ specifications across round, square, rectangular, and section steel, enabling consolidated multi-product container loading for projects requiring pipe, plate, and beam in a single shipment. Custom non-standard OD or wall thickness orders turn around in 15–25 days with flexible MOQ starting from 5 tons. Professional export documentation handling ensures CE, ISO 9001, and certificate of origin paperwork clears customs without delay.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345/A36 chemical composition and yield strength per GB/T 3091, ASTM A53, or EN 10219 as specified
- CE certificate per EN 10210 / EN 10219 for European market customs clearance and structural compliance
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report available upon request before container loading
- Full material traceability by heat number from coil input to finished pipe length
- Complete customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q235 Q345 A36 ERW welded round steel pipe bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Oiled surface treatment applied to black pipe to prevent rust formation during extended shipping and storage periods
- Container loading optimized by our professional team for mixed-diameter round pipe orders, maximizing weight per twenty-foot or forty-foot unit
- Custom cut-to-length service available within 1–12 m range to reduce on-site cutting waste for structural projects
- Each bundle marked with heat number, steel grade, outer diameter, wall thickness, and length for site identification
- Shipping terms available FOB, CIF, or DDP with real-time tracking from Jinan port to destination
Start Your Procurement With Verified Mill Documentation
Submit your specification sheet — outer diameter, wall thickness, steel grade, quantity, and destination port — and receive a competitive bulk quotation within twelve hours, complete with volume discount structure and mill test certificate sample. For non-standard dimensions or custom length requirements, our engineering team provides a fabrication feasibility review and lead time confirmation before contract signing.
Request Your Quotation and Mill Test Certificate Today
Send your inquiry via email at admin@sdxinjiyuan.com or contact us on WhatsApp at +86 188 5315 7756 with your full specification list to receive pricing, MTC samples, and delivery schedule.
Frequently Asked Questions
Q: How do Q235, Q345, and A36 compare across Chinese, American, and European standards?
A: Q235 corresponds roughly to S235JR in EN standards and shares similar yield characteristics with ASTM A36; Q345 aligns with S355JR and offers higher yield strength for structural applications. Full chemical composition and mechanical property comparison is available in our mill test certificates for each heat.
Q: Can you provide original mill test certificates and accept third-party inspection before shipment?
A: Yes, every batch of Q235 Q345 A36 ERW welded round steel pipe ships with an original mill test certificate documenting chemical composition and mechanical properties. SGS or BV third-party inspection is available upon request at our facility before container loading.
Q: What is the minimum order quantity for non-standard outer diameter or wall thickness?
A: Our flexible MOQ starts from 5 tons for standard specifications; custom non-standard dimensions or specialized steel grades require discussion with our technical team, with typical production lead times of 15–25 days depending on order volume and specification complexity.
Q: What surface treatment options are available for ERW welded round pipe?
A: Standard options include oiled finish for transit corrosion protection, black finish for indoor structural applications, and hot-rolled surface for projects requiring further coating or galvanizing. Galvanized and 3PE coating options are available for specific corrosion-resistance requirements.
Q: How do you optimize container loading for round steel pipe shipments?
A: Our professional export team develops customized loading plans based on outer diameter, wall thickness, and length to maximize container weight capacity while preventing damage. We handle complete export documentation and offer FOB, CIF, or DDP shipping terms with real-time tracking.
