Description
Factory-Direct ERW Pipe Supply — 3 production lines running simultaneously with monthly capacity exceeding 20,000 tons, eliminating middlemen markups on every API 5L ERW welded round steel pipe order.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 / Q345 ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, 10#, 20#, 35#, 45#, 16Mn, 40Cr, 15CrMo, 45Mn2 |
| Standard | API 5L, ASTM A53, ASTM A106, ASTM A178, BS, DIN, GB, JIS |
| Section Shape | Round |
| Size Range | OD 21.3–1420 mm |
| Wall Thickness | 2.11–300 mm (customizable) |
| Length | 6 m / 6.4 m / 12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled (as required) |
| Application | Fluid transport, structural, boiler, hydraulic, machinery |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Pipeline networks for crude oil, natural gas, and refined product transmission |
| Construction & Infrastructure | Structural columns, truss members, and piling supports for commercial buildings |
| Industrial Machinery | Hydraulic cylinder barrels, conveyor rollers, and machine frame components |
| Power & Energy | Boiler tubes, heat exchanger circuits, and cooling water circulation lines |
| Agricultural & Irrigation | Large-diameter water conveyance pipelines and drainage systems |
What Wall-Thickness Tolerance Costs on an API 5L ERW Welded Round Steel Pipe Order
A -8% wall deviation turns a compliant shipment into port-side scrap.
I watched a 1500mm shipment get rejected at Jebel Ali after SGS复检 found wall thickness running negative beyond acceptable limits. The entire lot sat on the dock for re-measurement while the project schedule slipped. When you source API 5L ERW welded round steel pipe from fragmented suppliers, you inherit their tolerance inconsistencies — heat-to-heat variations, uncalibrated rolling mills, and zero accountability when the mill test certificate doesn’t match the physical product. [NEED_CITE: API 5L wall thickness tolerance requirements for line pipe]
Matching OD Range to Pressure and Structural Demands
The 21.3–1420mm outer diameter span covers everything from instrument lines to main transmission headers. Thin-wall sections in the 2.11–6mm range serve low-pressure fluid conveyance where weight and cost matter more than burst rating. Heavy-wall configurations above 20mm handle structural loads and high-pressure hydrocarbon service. API 5L ERW welded round steel pipe in Q345 or 16Mn grades delivers the yield strength needed for load-bearing frames without the cost premium of seamless alternatives.
Engineering Compliance Across Global Markets
Structural applications demand conformity to EN 1993 or AISC specifications, which dictate minimum yield strength and dimensional tolerances for welded hollow sections. Fluid transport systems require API 5L or ASTM A106 compliance for pressure integrity and weld seam quality. Exporting to the EU means CE certification under EN 10210/10219; African markets often require PVOC or SONCAP pre-shipment verification. [NEED_CITE: CE marking requirements for structural steel hollow sections EN 10210]
ERW Process and Grade Selection Rationale
Electric Resistance Welding produces a longitudinal seam through localized heating and forge pressure, creating a weld zone with properties approaching the parent metal. This makes ERW suitable for moderate-pressure applications where seamless pipe’s cost premium isn’t justified. Q235 serves general structural and low-pressure fluid duties. Q345 and 16Mn provide higher yield strength for loaded structures. Alloy grades like 40Cr and 15CrMo handle elevated temperatures and wear conditions in machinery applications. The cold-rolled surface finish with light oiling protects against transit corrosion without adding coating costs.
Hidden Costs of Unverified Pipe Procurement
Material substitution — receiving Q195 when Q345 was specified — compromises structural capacity and fails engineering inspection. Missing or forged mill test certificates trigger customs holds and project compliance audits. Wall thickness running consistently negative reduces pressure rating and may require derating or replacement. [NEED_CITE: consequences of non-conforming steel pipe in pressure applications]
Why Project Buyers Source API 5L ERW Welded Round Steel Pipe Here
Three production lines running simultaneously provide monthly capacity exceeding 20,000 tons, supporting urgent bulk orders without queue delays. Every heat carries an original mill test certificate traceable to chemical composition and mechanical test results. Our in-house lab conducts three-stage inspection covering dimensional checks, visual weld examination, and mechanical testing. Third-party SGS or BV inspection is available before shipment for buyers requiring independent verification. We consolidate multi-product orders — pipe, plate, section steel — into optimized container loads, reducing freight costs and simplifying customs documentation.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and yield strength per API 5L or GB/T 9711
- CE certificate confirming EN 10210/10219 compliance for structural hollow sections exported to European markets
- ISO 9001:2015 quality management certificate covering production processes and inspection protocols
- SGS or BV third-party inspection report verifying dimensional accuracy, weld integrity, and material grade
- Full material traceability by heat number linking each pipe to its production batch and test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- API 5L ERW welded round steel pipe bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Slightly oiled surface treatment preserved through waterproof wrapping for 12m lengths shipped in open-top or flat-rack containers
- Container loading optimized for 6m and 12m lengths to maximize CBM utilization and minimize freight cost per ton
- Custom cutting to non-standard lengths available, with cut ends deburred and protected against corrosion
- Heat number and steel grade stenciled on each pipe end for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional export team handling documentation and port coordination
Requesting a Quotation for Your Next Pipe Requirement
Submit your specification sheet covering outer diameter, wall thickness, length, steel grade, quantity, and destination port. We respond within 12 hours with factory-direct pricing, volume discount tiers, production lead time, and available mill test certificate formats. For non-standard dimensions or alloy grades outside standard stock, we provide custom production schedules and sample approval workflows.
Frequently Asked Questions
Q: What is the difference between API 5L, ASTM A53, and GB/T 9711 for ERW pipe?
A: API 5L governs line pipe for oil and gas transmission with strict requirements on chemical composition, mechanical properties, and hydrostatic testing. ASTM A53 covers general purpose pipe for mechanical and pressure applications. GB/T 9711 is the Chinese national standard equivalent to API 5L for pipeline transport systems. The applicable standard depends on your project specification and end-use conditions.
Q: How do you verify material grade and wall thickness before shipment?
A: Every batch ships with an original mill test certificate showing chemical composition, yield strength, tensile strength, and elongation results traceable to the heat number. Third-party inspection by SGS or BV is available on request to independently verify dimensions, weld quality, and material properties before container loading.
Q: Can you produce non-standard wall thickness or outer diameter outside your listed range?
A: Yes, we manufacture custom dimensions beyond standard catalog sizes. MOQ for custom orders is 1 ton, with typical production lead times of 15–25 days depending on specification complexity and order volume. Send your drawing or specification for feasibility review and pricing.
Q: What surface treatment options are available for corrosion protection?
A: Standard delivery is cold-rolled with light oiling for transit protection. Additional options include black finish, hot-dip galvanized coating, or 3PE anti-corrosion coating for buried or marine environment applications. Surface treatment selection depends on installation environment and design service life.
Q: How do you optimize container loading for 12m long pipe?
A: We use specialized loading plans that nest smaller diameter pipes inside larger ones and stack bundles to maximize container CBM utilization. For 12m lengths, we coordinate with shipping lines on equipment availability and may recommend open-top or flat-rack containers when standard 40ft GP cannot accommodate the length without overhang.
Secure Factory-Direct Pricing on Your Next API 5L ERW Welded Round Steel Pipe Order
Send your specification and quantity to receive a detailed quotation with mill test certificate confirmation within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxinjiyuan.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
