Description
Factory-Direct Galvanized Pipe Supply — In-house hot-dip galvanizing line with coating thickness verified per batch by our physical and chemical laboratory before shipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 Galvanized Round Steel Pipe |
| Product Type | Round Steel Pipe |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B |
| Standard | ASTM |
| Section Shape | Round |
| Outer Diameter | Customizable |
| Wall Thickness | 1–30 mm |
| Length | 6 m / 12 m (customizable) |
| Technique | ERW |
| Surface Treatment | Hot-dip Galvanized |
| Tolerance | ±1% |
| Application | Greenhouse structures, Fluid pipe, Boiler pipe, Gas pipe, Hydraulic pipe, Oil pipe, Drill pipe, Chemical fertilizer pipe |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Agriculture & Greenhouse | Greenhouse frame structures, irrigation support columns, crop trellis systems |
| Construction & Infrastructure | Scaffolding uprights, fencing posts, light structural supports |
| Fluid & Gas Transmission | Low-pressure water conveyance, gas distribution lines, drainage systems |
| Industrial Machinery | Hydraulic cylinder sleeves, conveyor roller frames, equipment support stands |
What Coating Thickness Variation Costs on a Greenhouse Frame Order
A 20-micron shortfall in zinc coating can cut service life in half under humid greenhouse conditions.
Procurement teams sourcing Hot Dip Galvanized Round Steel Pipe for Greenhouse Supplier projects frequently discover coating inconsistencies only after the pipes reach the job site. Standard ERW tubes with nominal galvanizing specs may pass visual inspection but fail salt-spray durability tests within months — especially in tropical or coastal greenhouse environments where humidity and fertilizer vapors accelerate corrosion. [NEED_CITE: hot-dip galvanized coating thickness requirements for agricultural structures] Missing mill test certificates or absent third-party inspection reports compound the risk, leaving buyers unable to prove material compliance during project handover.
Matching Wall Thickness and Diameter to Greenhouse Structural Loads
Greenhouse frames demand a precise balance between structural rigidity and weight. The Hot Dip Galvanized Round Steel Pipe for Greenhouse Supplier range covers wall thicknesses from 1 mm to 30 mm, allowing engineers to specify lighter gauges for side-wall trellis supports while selecting heavier walls for main load-bearing arches and ridge columns. The hot-dip galvanizing process coats both exterior and interior surfaces uniformly, protecting against condensation-driven internal corrosion that ERW pipes often suffer in enclosed humid environments. Our production lines cover 2,800+ specifications, so non-standard diameters for custom greenhouse designs can be produced without splitting orders across multiple vendors.
Engineering Compliance and Certification Requirements
Structural hollow sections used in greenhouse construction must meet dimensional tolerance and material traceability requirements under applicable codes. [NEED_CITE: EN 10219 cold-formed hollow section requirements] For projects supplying into EU markets, CE certification per EN 10210/EN 10219 is mandatory for customs clearance and structural acceptance. ASTM-designated pipes follow a separate compliance track for North American buyers. Our in-house laboratory performs chemical composition analysis, tensile testing, and coating thickness measurement per heat number, generating mill test certificates that satisfy both EN 10204 3.1 and project-specific documentation requirements. The ±1% dimensional tolerance on our ERW pipes ensures consistent fit-up during on-site bolting and welding.
Understanding Q-Grade Steel and ERW Process for Galvanized Pipe
Q235 and Q345 represent China’s carbon structural steel grading system, where the number indicates minimum yield strength in MPa. Q235 suits light-duty greenhouse framing and fluid conveyance, while Q345 provides higher load capacity for multi-span greenhouse structures and industrial support frames. The ERW (Electric Resistance Welding) process forms round tubes from coiled strip steel, offering cost efficiency and consistent wall thickness for diameters typically used in greenhouse construction. Hot-dip galvanizing immerses the finished ERW pipe in molten zinc, creating a metallurgical bond that provides decades of corrosion protection — far superior to electro-galvanized or pre-galvanized alternatives for outdoor agricultural applications. The non-oiled surface finish ensures proper paint adhesion if secondary coating is required for aesthetic or additional protection purposes.
Hidden Costs of Sourcing the Wrong Galvanized Specification
Pipes with sub-standard zinc coating thickness or incorrect steel grade may pass initial price comparison but trigger costly failures downstream. Structural members that do not meet specified yield strength requirements face rejection during engineering inspection, causing project delays and replacement costs. [NEED_CITE: consequences of non-compliant steel grade in structural applications] Missing or forged mill test certificates lead to customs holds and potential demolition orders in regulated markets. Negative tolerance abuse — where actual wall thickness falls below nominal — reduces load-bearing capacity while inflating theoretical weight calculations, meaning buyers pay for steel they never receive.
Why Greenhouse Contractors Source from Xin Jiyuan
Our factory operates three dedicated production lines covering over 2,800 pipe specifications with wall thicknesses up to 40 mm, eliminating the need to coordinate between multiple suppliers for a single greenhouse project. Every batch of Hot Dip Galvanized Round Steel Pipe undergoes coating thickness verification in our in-house physical and chemical laboratory before release. We hold 41 invention patents and full international certifications including ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), and Singapore FPC, with SGS and BV third-party inspection available on request. Custom non-standard diameters and lengths are produced with low minimum order quantities, and our professional container loading team applies anti-damage measures to preserve the galvanized coating during ocean transit. We export to over 50 countries and serve as a designated supplier for major state-owned enterprises and listed construction companies.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per heat number
- CE certificate per EN 10210/EN 10219 for EU market customs clearance and structural acceptance
- ISO 9001:2015 quality management system certificate covering full production traceability
- SGS or BV third-party inspection report available for coating thickness and dimensional verification
- Material traceability by heat number from raw coil to finished galvanized pipe
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-dip galvanized Q235/Q345 round pipes bundled with steel strips and edge protectors to preserve zinc coating during handling
- Non-oiled surface finish with moisture-resistant wrapping for ocean transit to humid greenhouse project sites
- Container loading optimized for 6 m and 12 m standard lengths with anti-abrasion separators between pipe layers
- Custom cut-to-length service available to reduce on-site cutting waste at greenhouse assembly locations
- Heat number and steel grade stenciled on each pipe end for site identification and traceability
- FOB, CIF, and DDP shipping terms available with professional export documentation and tracking until arrival
Securing Your Greenhouse Pipe Supply with Verified Specifications
Submit your required outer diameter, wall thickness, steel grade, quantity, and destination port to receive a detailed quotation with unit pricing, production lead time, and mill test certificate samples. Our technical team reviews non-standard specifications within 12 hours and provides custom sizing options backed by our full certification package. Confirm third-party inspection requirements and container loading preferences before contract signing to ensure compliance with your project’s engineering standards.
Frequently Asked Questions
Q: What galvanizing coating thickness standard do your pipes meet?
A: Our hot-dip galvanized round pipes follow standard coating thickness requirements for structural applications, with each batch verified by our in-house laboratory. Specific coating weight can be confirmed through mill test certificates and third-party inspection reports from SGS or BV upon request.
Q: Can you produce non-standard diameters for custom greenhouse designs?
A: Yes, our production lines cover over 2,800 specifications with customizable outer diameters and wall thicknesses from 1 mm to 30 mm. Low minimum order quantities apply for custom non-standard sizes, and our technical team provides dimensional drawings for engineering approval before production.
Q: How do Q235 and Q345 steel grades compare to ASTM equivalents?
A: Q235 generally corresponds to ASTM A36 or A500 Grade B in yield strength, while Q345 aligns with ASTM A572 Grade 50 or A500 Grade C. We provide detailed grade equivalence documentation with mill test certificates to support customs clearance and engineering approval in your destination market.
Q: What inspection and certification documents are provided with each shipment?
A: Every shipment includes mill test certificates with chemical composition and mechanical properties per heat number, CE certificates for EU destinations, and complete customs documentation. Third-party inspection reports from SGS or BV can be arranged before shipment at buyer’s request.
Q: How do you protect the galvanized coating during container loading?
A: Our professional loading team uses edge protectors, anti-abrasion separators, and secure bundling to prevent zinc coating damage during ocean transit. Pipes are loaded with proper weight distribution and secured to prevent movement, ensuring the galvanized surface arrives intact at your project site.
Get Your Hot Dip Galvanized Round Steel Pipe Quote with Full Certification
Send your specifications including diameter, wall thickness, steel grade, and quantity to receive pricing and mill test certificate samples within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
