Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of Hot Dipped Galvanized Square Pipe Supplier | SHS RHS Galvanized Hollow Section in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
Hot Dipped Galvanized Square Pipe Supplier
Xi'an Dongmeng Group Co., Ltd. supplies hot dipped galvanized square pipes, galvanized rectangular hollow sections, SHS steel tubes and RHS steel tubes for construction, steel structures, solar mounting systems, fencing, greenhouse frames, handrails, machinery frames and general fabrication.
Our galvanized square and rectangular steel pipes are manufactured from high-quality carbon steel strip or welded hollow sections, followed by hot dip galvanizing or pre-galvanized surface treatment. The zinc coating helps improve corrosion resistance and service life in outdoor, industrial and construction environments.
We provide standard sizes, custom thickness, fixed length cutting, punching, drilling, bundle marking, export packing and complete quality documents for international B2B buyers.
What Is Hot Dipped Galvanized Square Pipe?
Hot dipped galvanized square pipe is a square hollow section steel tube with a zinc coating applied to the surface. The zinc layer provides barrier protection and sacrificial protection, helping the steel tube resist rust in outdoor and humid environments.
Compared with black square tube, galvanized square pipe offers better corrosion resistance and lower maintenance cost. Compared with round galvanized pipe, square and rectangular hollow sections are easier to weld, bolt, cut, drill and assemble in structural frameworks.
Product Range
| Item | Specification |
| Product | Hot Dipped Galvanized Square Pipe / Galvanized Rectangular Steel Tube |
| Shape | SHS Square Hollow Section / RHS Rectangular Hollow Section |
| Size | 20×20 mm – 500×500 mm; 20×40 mm – 400×600 mm |
| Wall Thickness | 1.0 mm – 30 mm |
| Length | 5.8 m, 6 m, 11.8 m, 12 m or customized |
| Material | Q195, Q235, Q355, S235JR, S355JR, SS400, ASTM A500 Grade B / C |
| Surface | Hot Dip Galvanized, Pre Galvanized, Black, Painted, Oiled |
| Zinc Coating | Common options: Z80–Z275 for pre-galvanized; 40–100 μm or customized for hot dip galvanized |
| Ends | Plain end, deburred end, plastic caps available |
| Processing | Cutting, drilling, punching, welding, bending, fabrication |
| Packing | Steel strip bundles, waterproof wrapping, sling belts, export seaworthy packing |
Available Types
Hot Dip Galvanized Square Pipe
Hot dip galvanized square pipe is produced by immersing the steel tube into molten zinc after forming and welding. It is suitable for outdoor steel structures, solar mounting systems, fence posts, handrails, agricultural frames and infrastructure projects.
Pre Galvanized Square Pipe
Pre galvanized square pipe is made from galvanized steel strip before tube forming. It usually has a smoother surface and is widely used for furniture frames, greenhouse frames, light structures, display racks and indoor or semi-outdoor applications.
Galvanized Rectangular Hollow Section
Galvanized RHS steel tube offers a high strength-to-weight ratio and is easy to connect with bolts, brackets and welded joints. It is commonly used in building frames, machinery bases, trailer parts, guardrails and construction supports.
Standards We Can Supply
| Standard | Description |
| ASTM A500 | Cold-formed welded and seamless carbon steel structural tubing in round, square and rectangular shapes |
| EN 10219 | Cold-formed welded structural hollow sections |
| JIS G3466 | Carbon steel square and rectangular tubes for general structural purposes |
| GB/T 6728 | Cold-formed hollow sections for structures |
| ASTM A53 | Welded and seamless steel pipe for general use |
| ISO 1461 / ASTM A123 | Hot dip galvanized coating requirements for fabricated steel products |
ASTM A500 is an important structural tubing standard for square, rectangular and round HSS used in construction and general structural purposes. AISC also notes that ASTM A500/A500M Grade C is commonly specified for square, rectangular and round hollow structural sections. EN 10219 is widely used for cold-formed structural hollow sections, including square and rectangular hollow sections. For galvanizing, EN ISO 1461:2022 is used for batch hot dip galvanized coatings on fabricated iron and steel articles.
Common Material Grades
| Grade | Equivalent / Similar Grade | Typical Application |
| Q195 | S195 | Light structure, furniture, greenhouse |
| Q235 | S235JR / SS400 | General construction, fence, handrail |
| Q355 | S355JR | Higher strength structural projects |
| ASTM A500 Grade B | Structural tubing grade | Construction and fabrication |
| ASTM A500 Grade C | Common HSS structural grade | Building frames, structural support |
Applications
Hot dipped galvanized square and rectangular steel pipes are widely used in:
Construction steel structures
Solar mounting brackets and photovoltaic support systems
Fence posts, guardrails and handrails
Greenhouse frames and agricultural structures
Warehouse racks and storage systems
Machinery frames and equipment bases
Trailer frames and transport structures
Outdoor sign frames and light poles
Scaffolding and temporary structures
Architectural and general fabrication projects
Why Choose Galvanized SHS RHS Tube?
Galvanized square and rectangular tubes provide good structural strength, easy fabrication and improved corrosion resistance. The box-shaped section offers better rigidity than many open profiles, making it suitable for frames, supports and welded structures.
Key advantages:
Good corrosion resistance for outdoor use
Higher rigidity than angle or channel profiles
Easy cutting, welding, drilling and punching
Suitable for bolted and welded structures
Available in both light and heavy wall thickness
Custom size and length available
Suitable for container loading and bulk export
Hot Dip Galvanized vs Pre Galvanized Square Pipe
| Item | Hot Dip Galvanized Square Pipe | Pre Galvanized Square Pipe |
| Process | Galvanized after tube forming | Made from galvanized steel strip |
| Zinc Layer | Usually thicker | Usually thinner and smoother |
| Surface | Slight zinc spangle or rougher finish possible | Smooth and bright surface |
| Corrosion Resistance | Better for outdoor use | Suitable for indoor or light outdoor use |
| Applications | Steel structure, fence, solar support, outdoor frame | Furniture, greenhouse, light frame, display rack |
| Cost | Higher | More economical |
Processing Service
We can supply not only standard galvanized square pipes, but also processed hollow sections according to your project drawings.
Available processing:
Fixed-length cutting
Hole punching
Drilling
End flattening
Angle cutting
Welding fabrication
Surface marking
Bundle labeling
Custom packing
Third-party inspection before shipment
Quality Control
Every order can be inspected according to customer requirements before shipment.
Inspection items include:
Raw material certificate checking
Outer dimension inspection
Wall thickness inspection
Length inspection
Straightness inspection
Weld seam appearance inspection
Zinc coating thickness test
Surface quality inspection
Bundle weight checking
Packing and marking inspection
MTC and document review
SGS, BV, TUV or Intertek inspection available
Packaging & Shipping
Galvanized square and rectangular steel pipes are packed in export seaworthy bundles. Standard packing includes steel strip bundling, waterproof wrapping, sling belts and bundle labels. For special projects, we can provide customized marking, barcode labels, protective caps or palletized packing.
Packing options:
Hexagonal or square bundles
Steel strip binding
Waterproof plastic wrapping
Nylon sling belts
Bundle tags and shipping marks
Container loading support
Bulk vessel shipment available for large orders
How to Get an Accurate Price?
To quote quickly and accurately, please send us:
Steel grade
Square or rectangular size
Wall thickness
Length
Hot dip galvanized or pre galvanized surface
Required zinc coating
Quantity
Destination port
Required standard or inspection documents
Processing requirements, such as cutting or punching
FAQ
Are you a manufacturer or trading company?
Xi'an Dongmeng Group Co., Ltd. is a professional steel product supplier with long-term production and export experience. We supply galvanized steel pipes, galvanized square tubes, galvanized rectangular hollow sections and related steel products for global B2B buyers.
Can you supply ASTM A500 galvanized square tube?
Yes. We can supply galvanized square and rectangular hollow sections according to ASTM A500, EN 10219, JIS G3466, GB/T 6728 and other project standards.
What is the difference between SHS and RHS?
SHS means Square Hollow Section. RHS means Rectangular Hollow Section. Both are box-shaped structural steel tubes used for frames, supports, construction and fabrication.
Can you provide hot dip galvanized and pre galvanized options?
Yes. Hot dip galvanized tubes are suitable for better outdoor corrosion resistance. Pre galvanized tubes are more economical and suitable for light structures, furniture, greenhouse and indoor applications.
Can you cut the tubes to fixed length?
Yes. We can provide fixed length cutting, deburring, drilling, punching and other processing services according to your drawing or packing requirement.
What documents can you provide?
We can provide MTC, commercial invoice, packing list, certificate of origin and other export documents. Third-party inspection by SGS, BV, TUV or Intertek can also be arranged.
What is your MOQ?
MOQ depends on size, material grade and surface treatment. Regular sizes can be supplied with flexible MOQ. For customized size or special zinc coating, MOQ will be confirmed according to production schedule.
How long is the delivery time?
For regular sizes, delivery is usually faster if stock or semi-finished material is available. For customized size, heavy thickness or special galvanizing requirements, production time will depend on order quantity and technical requirements.
Can you help with container loading?
Yes. We can provide export bundle packing, container loading plan and shipping support to help customers reduce damage risk and optimize freight cost.
Contact Us
Xi'an Dongmeng Group Co., Ltd.
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
Send us your size, thickness, length, zinc coating and quantity. Our team will provide a fast quotation, size chart and technical support for your galvanized square pipe project.
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