Description
Factory-Direct ERW Galvanized Pipes — Hot-dip zinc coating ≥300 g/m² verified by in-house lab, shipped with full mill test documentation to 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel Round Galvanized Steel Pipe |
| Product Type | Round Steel Pipe (ERW) |
| Steel Grade | Carbon Steel (Q195–Q235 equivalent per BS 1387) |
| Standard | BS 1387, ASTM |
| Section Shape | Round |
| Size Range | 1/2″–8″ (DN15–DN200) |
| Wall Thickness | 1.8–8 mm |
| Length | 5.8 m / 6 m / 12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Hot-Dip Galvanized (Zinc coated min. 300 g/m²) |
| Tolerance | ±1% |
| Ends | Threaded with couplings (NPT/BS) |
| Processing Service | Bending, Cutting |
| Application | Greenhouse structures, Fluid transport, Construction, Structural framing, Fencing |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Agriculture | Greenhouse framing, irrigation support structures, crop trellis systems |
| Construction | Scaffolding tubes, structural columns, handrail posts |
| Infrastructure | Fencing posts, signage poles, drainage culvert supports |
| Fluid Transport | Low-pressure water lines, plumbing risers, fire sprinkler brackets |
Why Zinc Coating Weight Determines Whether Your Greenhouse Survives Five Seasons
Hot-dip galvanizing at ≥300 g/m² is the single factor separating a structure that lasts from one that rusts through before the loan is repaid.
I have seen containers of galvanized pipe arrive at a Southeast Asian port looking perfectly bright — then fail third-party coating weight tests within a week. The visual finish meant nothing. Thin zinc in a humid greenhouse environment corrodes within two seasons, leaving bare steel exposed to ammonia-laden air from fertilizer and soil contact. For buyers sourcing a Round Galvanized Steel Pipe for Greenhouse Supplier projects, the coating specification is not a line item on a quote — it is the structural lifespan. [NEED_CITE: hot-dip galvanizing coating weight requirements per BS 1387 and ISO 1461]
Matching DN15–DN200 Sizes to Greenhouse Load and Connection Requirements
Greenhouse frames demand a specific combination: small-to-medium diameters for arch and purlin members, threaded ends for bolted joint assembly without on-site welding, and corrosion resistance that withstands constant humidity. Our Round Galvanized Steel Pipe for Greenhouse Supplier inventory covers DN15 through DN200 in 1.8–8 mm wall thickness, allowing a single purchase order to cover main columns, secondary bracing, and gutter supports. The threaded couplings (NPT/BS) let crews assemble frames with standard wrenches — critical in regions where certified welders are scarce or expensive. Custom cutting to project-specific lengths eliminates field waste and reduces shipping volume per container.
Engineering Compliance and Certification for Structural and Export Markets
Load-bearing greenhouse structures in the EU require CE-marked hollow sections conforming to EN 10210 or EN 10219, while Middle Eastern and African infrastructure tenders often specify ASTM equivalence. Our BS 1387 and ASTM-listed pipes carry Lloyd’s Register EU CE certification, and every heat is tested in our in-house physical and chemical laboratory before release. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections certification requirements] For projects demanding third-party verification, SGS and BV inspection reports are arranged prior to shipment, ensuring customs clearance proceeds without document-related delays. The ±1% dimensional tolerance keeps every cut within structural engineering assumptions — a detail that matters when a 2 mm deviation on a 6 m arch member throws the entire bay out of plumb.
Understanding ERW Welding and Hot-Dip Galvanizing for Carbon Steel Pipe Performance
ERW (Electric Resistance Welded) pipe forms round sections by passing steel strip through rolling mills and welding the seam through electrical resistance heat — no filler metal, no slag. This process produces consistent wall thickness and smooth internal surfaces ideal for fluid transport and structural framing. The Q195–Q235 carbon steel grades offer good formability for bending into greenhouse arches while maintaining adequate yield strength for light structural loads. Hot-dip galvanizing immerses the finished ERW pipe in molten zinc, creating a metallurgical bond that coats both exterior and interior surfaces. The ≥300 g/m² coating weight specified here exceeds standard electro-galvanized alternatives, providing sacrificial protection that resists white rust formation and extends service life in agricultural and coastal environments. [NEED_CITE: comparison of hot-dip versus electro-galvanized coating durability in corrosive atmospheres]
The Hidden Cost of Accepting Sub-Spec Coating and Missing Mill Certificates
Pipes with zinc coating below 300 g/m² may pass visual inspection at the factory but fail laboratory testing at destination — triggering rejection, re-dipping costs, or outright project shutdown. Missing or forged mill test certificates cause customs holds that delay container release and incur port storage fees. [NEED_CITE: consequences of non-compliant steel imports on project timelines and customs clearance] When a greenhouse contractor in the Philippines received a container of pipes that looked acceptable but failed coating weight verification, the entire lot required re-galvanizing at our expense — a loss absorbed only because we stood behind our specification. For buyers, the lesson is clear: accept nothing less than verified coating weight and original mill documentation.
Procurement Confidence Through Verified Quality and Full Documentation
Every Round Galvanized Steel Pipe for Greenhouse Supplier order ships with mill test certificates documenting chemical composition and mechanical properties per BS 1387. Our in-house laboratory tests every heat before release — no batch leaves without verified coating weight and dimensional inspection. With 2,800+ specifications across our production lines, we consolidate pipes, plates, and structural sections into single shipments, eliminating the coordination burden of multi-supplier procurement. Lloyd’s Register EU CE certification and ISO 9001:2015 quality management ensure compliance across 50+ export markets. Custom cutting and bending services allow project-specific lengths and fabricated components, reducing on-site labor and material waste. Professional container loading optimization maximizes payload per shipment, and door-to-door logistics coordination handles port clearance and inland delivery.
Documentation & Compliance
- Mill test certificate documenting Q195–Q235 chemical composition and mechanical properties per BS 1387
- Lloyd’s Register EU CE certificate (EN 10210/EN 10219) for European market structural compliance
- ISO 9001:2015 quality management system certificate covering production and testing processes
- SGS or BV third-party inspection report verifying zinc coating weight ≥300 g/m² and dimensional tolerance
- Material traceability by heat number linking each pipe to laboratory test records
- Customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-dip galvanized pipes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Threaded ends capped with plastic protectors to prevent damage to NPT/BS threads during handling
- Container loading optimized for 5.8 m / 6 m / 12 m lengths to maximize payload per 20ft or 40ft shipment
- Custom cutting available to project-specific lengths, reducing field waste and shipping volume
- Heat number and steel grade markings stenciled on each bundle for site identification and traceability
- FOB, CIF, and DDP logistics options with real-time tracking from Jinan port to destination
Ready to Specify Coating Weight and Get Verified Mill Documentation
Submit your greenhouse frame specifications — diameter, wall thickness, length, quantity, and destination port — to receive a detailed quotation including zinc coating verification, mill test certificates, and container loading plan. Our team responds within 12 hours with pricing, production lead time, and available third-party inspection options.
Request Your Galvanized Pipe Specification and Mill Test Certificate
Send your Round Galvanized Steel Pipe for Greenhouse Supplier requirements via email or WhatsApp to receive factory-direct pricing with full documentation.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized steel pipes?
A: Hot-dip galvanizing immerses finished pipe in molten zinc, creating a metallurgical bond with coating weight ≥300 g/m² for long-term corrosion protection. Pre-galvanized (electro-galvanized) pipe receives a thinner zinc layer typically 40–80 g/m², suitable for indoor applications but insufficient for outdoor greenhouse or coastal environments.
Q: Can you provide third-party inspection certificates (SGS/BV) for customs clearance?
A: Yes. SGS and BV third-party inspection reports verifying zinc coating weight, dimensional tolerance, and chemical composition are arranged prior to shipment. These reports accompany mill test certificates to ensure smooth customs clearance in EU, Middle East, and Southeast Asian markets.
Q: What is the minimum order quantity for custom lengths and threaded ends?
A: The standard MOQ is 1 Ton. Custom cutting to project-specific lengths and threaded ends with NPT/BS couplings are available within this minimum. For large greenhouse projects requiring multiple diameter sizes, we consolidate orders to optimize container loading.
Q: How do you ensure zinc coating thickness meets project specifications?
A: Every heat is tested in our in-house physical and chemical laboratory before release. Coating weight is verified to meet or exceed 300 g/m² per BS 1387 and ISO 1461 standards. Mill test certificates document coating weight results, and third-party SGS/BV inspection is available for additional verification.
Q: What are the payment terms and delivery options (FOB/CIF/DDP)?
A: Standard payment terms are 30% deposit by T/T to lock production, with balance paid before shipment or against copy of bill of lading. Delivery options include FOB Qingdao port, CIF destination port, or DDP door-to-door service. Production lead times and shipping schedules are confirmed upon order placement.
Get Verified Galvanized Pipe with Full Mill Documentation
Submit your diameter, wall thickness, length, and quantity requirements to receive factory-direct pricing with coating weight verification and mill test certificates.
