Description
Factory-direct pricing, zero middlemen markup — Every Q235 and S355 ERW welded steel pipe ships straight from our Jinan production lines to your project site, eliminating distributor margins on orders from 5 tons upward.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 / S355 ERW Welded Steel Pipe |
| Product Type | ERW Welded Steel Pipe |
| Steel Grade | Q195, Q235, Q355, S355, 20#, 45#, 16Mn, A36, A53, A106, ST35, ST52 |
| Standard | API 5L, ASTM A53, ASTM A106, ASTM A252, ASTM A500, ASME B36.10M, BS EN 10219, BS EN 10296, GB/T 3091, GB/T 9711 |
| Section Shape | Round |
| Size Range | Outer Diameter 10–1219 mm |
| Wall Thickness | Cold rolled 1–4.0 mm / Hot rolled 4–20 mm |
| Length | 1–12 m |
| Technique | ERW / Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Oiled / Black / Hot Rolled |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per request) |
| Application | Fluid transport, Structural frames, Scaffolding, Machinery, Building & construction, Oil & gas pipelines |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Fluid and gas pipeline systems for industrial plants and energy infrastructure |
| Construction Companies | Building structural frames, scaffolding systems, and bridge support columns |
| Machinery Manufacturers | Hydraulic cylinders, conveyor rollers, and mechanical equipment tubing |
| Infrastructure Developers | Piling tubes for foundation works and underground utility conduits |
Dimensional Tolerance Is Where ERW Welded Steel Pipe Orders Fail Acceptance
A ±1% tolerance on a 1219 mm OD pipe still means ±12 mm of deviation — and that gap decides whether your flange bolts align or your pile caps crack.
Global procurement teams routinely receive ERW welded steel pipe shipments where wall thickness negative tolerance creeps past the 12.5% ASTM A53 limit, or where OD ovality prevents proper gasket seating in pressurized fluid lines. The mill certificate looks clean, but random SGS sampling at destination tells a different story. That mismatch between paperwork and physical reality forces weeks of on-site sorting, re-welding, or outright rejection — costs that never appear in the original quotation. [NEED_CITE: ASTM A53 dimensional tolerance requirements for ERW pipe]
Matching Wall Thickness to Structural Load Paths
When specifying Q235 or S355 ERW welded steel pipe for structural frames, the cold-rolled 1–4.0 mm range suits non-load-bearing scaffolding and light machinery enclosures, while the hot-rolled 4–20 mm wall section carries the compressive forces in building columns and bridge piers. Our in-house physical and chemical laboratory tests every heat against the relevant EN 10219 or ASTM A500 requirements before the pipe leaves the mill floor, so the dimensional data on your mill test certificate matches what arrives at the port. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections dimensional tolerances]
Engineering Compliance Across Destination Markets
European EPC contractors require CE marking under EN 10210 or EN 10219 for structural hollow sections — a certification gap that blocks customs clearance at Rotterdam or Hamburg. North American projects reference ASTM A53 and A500, while Middle East infrastructure specs often call for API 5L for pipeline-grade material. Our production lines hold CE EN 10210/EN 10219 certification alongside ISO 9001:2015 registration, and we coordinate SGS or BV third-party inspection before loading, so the documentation package clears both origin and destination customs without delay. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10219]
Steel Grade Selection and ERW Process Fundamentals
The Q-series (Q195, Q235, Q355) follows the Chinese GB standard system where the number indicates minimum yield strength in MPa, while the S-series (S355) and ASTM grades (A36, A53, A106) represent European and American equivalents — Q235 broadly corresponds to S235JR and A36 in structural applications. ERW welding forms the pipe by rolling a steel strip into a cylinder and fusing the seam through high-frequency electric current, producing a weld zone that undergoes the same heat treatment and ultrasonic inspection as the parent metal. For fluid transport in oil and gas pipelines, A106 Grade B or ST35/ST52 grades provide the elevated-temperature performance that standard structural grades cannot deliver. Surface treatment choice — oiled for short-term transit protection, black for indoor structural use, or hot-rolled finish for subsequent galvanizing — depends on the corrosion environment and downstream processing at the fabrication yard.
The Hidden Cost of Unverified Mill Certificates
Purchasing ERW welded steel pipe based on a supplier’s self-declared certificate without third-party verification exposes projects to material substitution risks — lower-grade steel shipped against S355 purchase orders, wall thickness below the specified tolerance, or weld seams lacking proper fusion. The consequences surface during ultrasonic testing at the construction site, during structural load calculations that no longer match as-built conditions, or during final inspection when the engineer rejects the entire batch. These failures trigger re-procurement timelines measured in weeks, not days, and the original supplier rarely absorbs the cost. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Procurement Confidence Built on Factory-Level Control
As the manufacturing source for these ERW welded steel pipes, we control every production variable from coil selection through final inspection — no trading company markup, no specification translation errors between intermediaries. Our in-house laboratory performs chemical composition analysis, tensile testing, and ultrasonic weld inspection on every heat, generating original mill test certificates that travel with each shipment. The 2,800+ specification range across our three production lines means your non-standard OD or wall thickness request does not require sourcing from a second supplier. We hold 41 invention patents including proprietary sharp-corner rectangular tube technology, and our CE, ISO, SGS, and BV certifications cover the full product range exported to 50+ countries. Professional loading plans optimize container utilization for 1–12 m pipe lengths, and we coordinate FOB, CIF, or DDP logistics to your destination port.
Documentation & Compliance
- Mill test certificate documenting Q235B chemical composition and yield strength per GB/T 700, or S355JR mechanical properties per EN 10219, issued for each heat number
- CE certificate confirming compliance with EN 10210/EN 10219 for structural hollow sections exported to European Union member states
- ISO 9001:2015 quality management system certificate covering the full ERW welded steel pipe production process
- SGS or BV third-party inspection report verifying dimensional tolerance, surface condition, and weld integrity before vessel loading
- Material traceability documentation linking each pipe bundle to its original heat number, coil certificate, and production date
- Customs clearance package including packing list, bill of lading, and certificate of origin formatted for destination port requirements
Packaging, Loading & Delivery
- ERW welded steel pipes bundled with galvanized steel strips at intervals matching the 1–12 m length range, with edge protectors preventing surface damage to oiled or black finish during transit
- Oiled surface treatment applied to cold-rolled 1–4.0 mm wall thickness pipes to prevent oxidation during ocean freight to Southeast Asia and Middle East destinations
- Container loading plans optimized for 10–1219 mm OD pipes, maximizing 20ft and 40ft container payload while maintaining weight distribution for crane handling at site
- Custom cutting to project-specific lengths within the 1–12 m range, reducing on-site waste and secondary cutting labor for scaffolding and structural frame applications
- Heat number and steel grade stenciled on each pipe end, with bundle tags matching the mill test certificate for site-level material verification
- FOB Jinan or Qingdao port for standard orders, with CIF and DDP options available to 50+ countries including EU, North America, India, and the Middle East
Initiating Your ERW Welded Steel Pipe Inquiry
Submit your required outer diameter, wall thickness, steel grade, total quantity, and destination port through email, WhatsApp, or phone — our engineering team responds within 12 hours with a detailed quotation including unit pricing, production timeline, applicable certifications, and payment terms. For non-standard specifications outside the 10–1219 mm OD range or custom surface treatment requirements, we provide technical feasibility confirmation and lead time estimates before contract signing.
Request Your ERW Welded Steel Pipe Quotation Today
Send your specification sheet and quantity requirements to receive factory-direct pricing, original mill test certificate samples, and a confirmed production schedule within one business day.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do Q235, S355, and A36 steel grades compare for structural applications?
A: Q235 follows the Chinese GB/T 700 standard, S355 follows the European EN 10025 standard, and A36 follows the American ASTM A36 standard. All three serve structural frame and building construction purposes, with S355 offering higher minimum yield strength than Q235 and A36. We provide cross-reference documentation and can supply mill test certificates confirming compliance with your specified standard.
Q: Can you arrange third-party inspection before shipment?
A: Yes. We accept SGS, BV, and other internationally recognized third-party inspection agencies to verify dimensional tolerance, surface condition, weld quality, and material certification before loading. The inspection scope and standards are confirmed in the proforma invoice, and the original inspection report is included in the shipping documentation package.
Q: What is the minimum order quantity for non-standard sizes?
A: The standard MOQ is 5 tons. For custom outer diameters, wall thicknesses, or lengths outside our regular 10–1219 mm OD and 1–12 m length range, we evaluate production feasibility based on your specific requirements and confirm the minimum quantity during the quotation stage.
Q: Which surface treatment should I select for outdoor structural applications?
A: For outdoor or corrosive environments, we recommend hot-dip galvanizing after the ERW welded steel pipe is produced in black or hot-rolled finish. The oiled surface treatment provides short-term rust prevention during transit and storage but is not suitable for long-term outdoor exposure. We can coordinate galvanizing processing as part of your order.
Q: Do you provide CE certification for European Union imports?
A: Yes. Our ERW welded steel pipes hold CE certification under EN 10210 and EN 10219 for structural hollow sections. The CE certificate, along with the declaration of performance and mill test certificate, is included in the documentation package to ensure customs clearance and project compliance in EU member states.
Secure Factory-Direct ERW Welded Steel Pipe Pricing
Submit your complete specification requirements — OD, wall thickness, steel grade, quantity, and destination — to receive a detailed quotation with mill test certificate confirmation and production schedule within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
