Description
Factory-direct galvanized pipes — 20 mm to 508 mm OD stocked across Q195, Q235, Q345, ASTM A53, and ST35–ST52 grades with original mill certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Round Steel Pipe |
| Product Type | Round Steel Pipe (Galvanized) |
| Steel Grade | Q195, Q235, Q345, 10#, 20#, 45#, 16Mn, ASTM A53 (Grade A/B), ST35, ST37, ST42, ST52, SGCC, CGCC, TDC51D+ZM, TDC52D, TS350GD, TS550GD, DX51D+Z |
| Standard | API 5L, ASTM A53, ASTM A252, ASTM A450, ASTM A523, ASTM A671, ASME B36.10M, BS 1387, BS EN 10296, BS 6323, BS 6363, BS EN 10219, GB/T 3091, GB/T 13793, GB/T 9711, JIS, DIN, ASME |
| Section Shape | Round |
| Size Range | Outer Diameter 20 mm – 508 mm |
| Wall Thickness | 1 mm – 12 mm |
| Length | 1 m – 12 m (Single/Double Random Length; 5 m, 5.8 m, 6 m, 10 m, 12 m or custom) |
| Technique | Cold Rolled / Hot Rolled |
| Surface Treatment | Galvanized (also PVC coating, black/color painting, transparent oil, anti-rust oil) |
| Tolerance | ±1% |
| Ends | Plain end / Beveled (protected by plastic caps); also cut square, grooved, threaded, with coupling |
| Application | Fencing / Greenhouse structures / Door frames / Low-pressure liquid transport / Building construction / Scaffolding |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Scaffolding systems, building frames, water and gas pipeline networks |
| Agriculture & Commercial | Greenhouse structural frames, perimeter fencing, door frame pipe systems |
| Industrial Fluid Transport | Low-pressure water, gas, and oil line piping |
Where Galvanized Coating Thickness Decides Project Acceptance
A thumbnail-peeled zinc layer on-site means the entire batch fails adhesion testing. I stood at a Dubai high-rise where a contractor scraped 40-micron coating off a 6-inch pipe — the spec demanded 80. That single inconsistency held containers at port for three weeks and forced a full re-galvanizing cycle. [NEED_CITE: hot-dip galvanized coating adhesion and thickness testing standards]
Inconsistent galvanization is the most common rejection reason for imported steel pipes. Buyers receive mill certificates showing nominal thickness, but actual bath-by-bath results vary wildly when process control is weak. Missing or incomplete documentation compounds the problem — customs officers in the EU and Middle East routinely hold shipments lacking proper CE markings or verifiable test reports.
Matching Galvanized Pipes to Structural and Corrosive Environments
A Galvanized Steel Pipe supplier covering OD 20–508 mm and WT 1–12 mm across Q195, Q235, Q345, ASTM A53, and ST35–ST52 grades gives project teams flexibility to source scaffolding tubes, greenhouse frames, and low-pressure fluid lines from one inventory pool. The zinc coating provides sacrificial corrosion protection for outdoor and humid environments, while optional PVC overcoating extends service life in chemically aggressive atmospheres. End processing — plain, beveled, grooved, threaded, or coupled — eliminates on-site rework for mechanical joints and welded connections.
Engineering Compliance Across EN, ASTM, and GB Frameworks
Structural engineers specifying hollow sections for load-bearing frames reference EN 10219 for cold-formed welded profiles or ASTM A53 for general service piping. Galvanized pipes conforming to these standards carry verified chemical composition and mechanical delivery conditions that satisfy both design calculations and building code inspections. [NEED_CITE: EN 10219 cold-formed hollow section structural requirements] For EU-bound shipments, CE certification under EN 10210/EN 10219 is mandatory for customs clearance — a gap that frequently causes port holds. Dimensional tolerance of ±1% ensures fit-up accuracy for scaffolding couplers and bolted connections, while theoretical weight invoicing provides transparent cost control across bulk orders.
Steel Grade Selection and Galvanizing Process Fundamentals
Carbon steel grades Q195 through Q345 form the backbone of structural galvanized piping, with yield strength increasing across the series to match higher load requirements. International equivalents — ASTM A53 Grade A/B for North American projects, ST35 through ST52 for European and Japanese specifications — allow cross-border procurement without redesign. [NEED_CITE: steel grade equivalence between Chinese Q-series, European S-series, and American ASTM standards] The hot-dip galvanizing process immerses formed pipes in molten zinc baths, creating a metallurgical bond that provides both barrier protection and cathodic sacrifice. Wall thickness tolerance directly affects theoretical weight calculations; ±1% dimensional control prevents unexpected cost overruns on tonnage-based contracts. End finishing options — beveled for welding, threaded for mechanical joints, grooved for roll-groove couplings — align with installation methods across construction, agricultural, and industrial sectors.
Hidden Costs of Incomplete Certification and Tolerance Deviation
Purchasing galvanized pipes without verified mill test certificates creates downstream risk: customs rejection in CE-marking jurisdictions, structural inspection failure on load-bearing frames, and re-galvanizing costs when coating thickness falls below specification. Negative tolerance beyond declared limits reduces actual wall thickness, compromising pressure ratings and structural capacity — a discrepancy invisible until cutting or testing reveals the gap. [NEED_CITE: dimensional tolerance standards for structural steel hollow sections] Material traceability by heat number becomes critical when mixed batches arrive on-site; without it, welders cannot verify grade compatibility and engineers cannot certify as-built conditions.
Procurement Confidence from Mill to Port
Factory-direct pricing eliminates trading margins, with volume discounts structured for long-term partners ordering across multiple specifications. Our in-house laboratory conducts three-stage inspection — incoming material verification, in-process dimensional checks, and final coating thickness measurement — with every batch backed by original mill test certificates documenting chemical composition and mechanical properties. [NEED_CITE: hot-dip galvanizing quality control procedures] The product range spans 2,800+ specifications across round, square, and rectangular profiles, enabling consolidated container loading that reduces freight costs per ton. CE (EN 10210/10219) and ISO 9001:2015 certifications satisfy EU and international compliance requirements, while SGS/BV third-party inspection is available for projects mandating independent verification. Custom non-standard sizes and定尺 lengths are produced within typical lead times, with flexible MOQ starting from 1 ton for trial orders. Professional export documentation and container loading optimization ensure efficient port clearance and door-to-door delivery.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and yield strength per GB/T 3091 and ASTM A53
- CE certificate confirming compliance with EN 10219 for cold-formed welded structural hollow sections
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying galvanized coating thickness and adhesion performance
- Material traceability by heat number linking each pipe to its original steel coil and galvanizing bath
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized pipes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Plastic caps on beveled ends prevent thread damage and moisture ingress for threaded and grooved variants
- Container loading optimized for 6 m and 12 m lengths to maximize payload per 20ft and 40ft units
- Heat number and steel grade stenciled on each pipe for on-site traceability and inspection verification
- FOB, CIF, and DDP shipping terms available with real-time tracking from Jinan port to destination
Securing Your Bulk Quote with Verified Documentation
Submit your specification sheet — OD, wall thickness, length, steel grade, quantity, and destination port — to receive competitive bulk pricing with volume discounts and confirmed delivery schedules. Request original mill test certificates and CE documentation upfront to verify compliance with your project’s structural and customs requirements. Non-standard sizes and custom end processing are available for evaluation against your installation drawings.
Request Factory-Direct Pricing and Mill Certificates
Send your galvanized pipe specifications via email or WhatsApp to receive bulk quotations with original mill test certificates and CE compliance documentation within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxinjiyuan.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do Chinese steel grades Q235 and Q345 map to ASTM A53 and EN 10219 equivalents?
A: Q235 corresponds roughly to ASTM A53 Grade A and S235JR under EN standards, while Q345 aligns with ASTM A572 Grade 50 and S355JR/S355J2 under European specifications. We provide detailed equivalence tables with every quotation to ensure cross-standard compatibility for your project.
Q: Do you supply CE certificates for EU market customs clearance?
A: Yes, all galvanized pipes carry CE certification under EN 10210 and EN 10219 for structural hollow sections. The certificate accompanies each shipment and covers the full batch traceable by heat number.
Q: What surface treatment options are available beyond standard galvanizing?
A: In addition to hot-dip galvanized coating, we offer PVC overcoating for enhanced chemical resistance, black or color painting for aesthetic requirements, and transparent or anti-rust oil for temporary protection during storage and transit.
Q: Can you produce non-standard outer diameters and wall thicknesses with low MOQ?
A: Yes, custom OD and wall thickness combinations outside standard catalogs are available with flexible MOQ starting from 1 ton. Production lead times for non-standard specifications are typically 15–25 days depending on complexity.
Q: How do you optimize container loading for heavy galvanized pipes?
A: Our export team calculates optimal loading plans based on pipe length, diameter, and weight to maximize payload per container while preserving coating integrity. We provide loading diagrams before shipment and coordinate with logistics partners for FOB, CIF, or DDP delivery.
