Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Galvanized Steel Pipe, Square/Rectangle Steel Pipe
Galvanized Square and Rectangular Hollow Section Pipe
Zinc coated square and rectangular hollow section in ASTM JIS and EN BS grades
Galvanized square pipe is a square or rectangular hollow section with a zinc coated surface, used where a flat sided member is easier to connect and clad than a round tube. It is bought by frame builders, fencing and greenhouse contractors and solar mounting fabricators who need the section to survive outdoors without a site paint program. Supplying the section already galvanized closes the gap between fabrication and installation where untreated frames sit in a yard and start to rust before they are erected. Grades cover the ASTM A36 A53 A106 and A333 range, the JIS SS330 SS440 SS490 SPHD and SPHE range and the EN BS S185 to S355J2H structural range.
- Product Name — Galvanized Square Pipe
- Also Known As — Galvanized square hollow section galvanized rectangular tube
- Section Shape — Square and rectangular
- ASTM Material — A36, A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6
- JIS Material — SS330, SS440, SS490, SPHD, SPHE
Why It Is Specified
Key Benefits of Galvanized Square Pipe
Flat Faces Simplify Connections
A square face takes a bolted cleat, a bracket or a cladding rail without a saddle or a profiled cut, which cuts fitting time in a frame shop.
Three Grade Systems Cross Referenced
ASTM, JIS and EN BS designations are carried on the same product line, so a drawing written in S275JR and a drawing written in SS490 class material can be quoted from one enquiry.
Zinc Coating For Outdoor Structures
The galvanized surface removes the shop primer and site topcoat cycle on structures that sit in the open, such as fencing runs and greenhouse frames.
Wall Range Covers Light And Heavy Frames
Wall thickness spans 1.65mm to 80mm across the SCH5S to SCH160 and XS listing, so a light fencing rail and a heavy load bearing post come from the same supplier.
Cut Lengths Set Before Loading
Fixed 5.8m, 6m and 12m lengths or 2-12m random lengths are set before shipment so the sections match your container and your handling gear.
Documented Supply
ISO9001, BV, SGS and RoHS certification is stated for this line, which supports the incoming inspection record your quality department keeps.
Problems It Solves
What This Material Removes From Your Process
Painting Frames On Site
Field painting a fabricated frame is slow and weather dependent. A galvanized section arrives with its coating already on and needs attention only at cuts and welds.
Drawings Written In Different Grade Systems
One project references EN grades and the next references JIS. Carrying ASTM, JIS and EN BS designations on the same line keeps the grade conversation short.
Round Tube Connections Costing Fabrication Time
Round tube joints need saddle cuts and shaped plates. Flat faces on a square section take a straight cut and a flat plate instead.
Buying Light And Heavy Sections Separately
Projects mix thin rails with heavy posts. A 1.65mm to 80mm wall range means both come on one order with one document set.
Cutting Waste From Standard Bar Lengths
Standard lengths that do not divide into your member size leave offcuts. Fixed 5.8m, 6m or 12m and 2-12m random options let the length be chosen against the cutting plan.
Application Scenarios
Where It Is Used
Greenhouse and Shade Structure Frames
Posts, purlins and arch members in agricultural structures where the frame stands in a humid environment for its whole life.
Solar Mounting and Support Racks
Ground mount racking and carport legs where a galvanized section avoids maintenance painting across a large installed area.
Fencing Gates and Barriers
Fence posts, rails and gate frames where a flat face makes mesh and panel fixing straightforward.
Light Industrial Buildings and Mezzanines
Columns, bracing and mezzanine framing in workshops and warehouses built from hollow section rather than open profiles.
Handrails Walkways and Platform Frames
Access platforms and walkway frames in plants where exposed steelwork has to resist weather and washdown.
Trailer Body and Equipment Frames
Chassis rails, body frames and machine bases where the square section carries load and supports panel mounting.
Who It Is For
Buyers Who Specify This Product
- Frame fabricators buying square hollow section for greenhouse and shade structures
- Solar mounting contractors buying galvanized posts and rails for ground mount arrays
- Fencing and gate manufacturers buying square posts and rails in repeat lengths
- Steel building contractors buying hollow section columns and bracing for light industrial frames
- Trailer and equipment builders buying square tube for chassis and body frames
- Distributors stocking a wall thickness range across ASTM JIS and EN BS grades
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | Galvanized Square Pipe |
|---|---|
| Also Known As | Galvanized square hollow section galvanized rectangular tube |
| Section Shape | Square and rectangular |
| ASTM Material | A36, A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6 |
| JIS Material | SS330, SS440, SS490, SPHD, SPHE |
| EN BS Material | S185, S235, S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H |
| Size | 1/2 inch to 48 inch starting at 21.3mm or customized |
| Wall Thickness | SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160, XS covering 1.65mm to 80mm or customized |
| Length | 5.8m and 6m fixed, 12m fixed, 2-12m random or customized |
| Surface | Galvanized |
| Place of Origin | China |
| Certificate | ISO9001, BV, SGS, RoHS |
Technical Features
- Square and rectangular hollow section with galvanized surface
- ASTM grades A36 A53 Gr. A and Gr. B A106 GR.A and GR.B A333 GR1 GR3 GR6
- JIS grades SS330 SS440 SS490 SPHD and SPHE
- EN BS grades S185 S235 S235JR S235 G2H S275 S275JR S355JRH and S355J2H
- Size from 1/2 inch to 48 inch starting at 21.3mm or customized
- Wall thickness SCH5S to SCH160 and XS covering 1.65mm to 80mm
- Length 5.8m or 6m fixed, 12m fixed, 2-12m random or customized
- ISO9001 BV SGS and RoHS certification stated for this line
Materials
- ASTM carbon steel in A36 A53 A106 and A333 grades
- JIS hot rolled steel in SS330 SS440 SS490 SPHD and SPHE
- EN BS structural steel from S185 through S355J2H
- Zinc coating applied to the section surface
Certification
- ISO9001
- BV
- SGS
- RoHS
Manufacturing
How It Is Made and Processed
Forming the strip or tube into the ordered square or rectangular section
Sizing to the ordered section dimension and wall thickness
Cutting to 5.8m 6m 12m fixed or 2-12m random length
Surface preparation ahead of coating
Galvanizing of the section surface
Bundling strapping and marking
Loading for export shipment
Quality Control
Checks Before It Ships
- Grade confirmed against the ordered ASTM JIS or EN BS designation
- Section dimension checked against the ordered size
- Wall thickness checked across the 1.65mm to 80mm range
- Zinc coverage inspected on the faces and corners
- Cut length and squareness of the end checked before bundling
- Bundle strapping and marking verified before loading
Customization
What We Can Change on Your Order
- Section size outside the standard listing made to order
- Wall thickness selected across the 1.65mm to 80mm range per member
- Cut to a fixed length of your own instead of 5.8m 6m or 12m
- Grade quoted in the ASTM JIS or EN BS designation your drawing uses
- Bundle size and marking arranged to suit site delivery
Comparison
Galvanized Square Pipe Against the Alternatives
| Round galvanized pipe | Flat faces take bolted cleats and cladding rails directly, so the fabricator avoids saddle cuts and profiled connection plates. |
|---|---|
| Black square pipe painted on site | The zinc coating is applied before shipment, so the frame does not wait on a weather dependent site painting program. |
| Open profiles such as angle and channel | A closed hollow section gives torsional stiffness in both axes and presents fewer ledges for water and dust to sit on. |
| Aluminium extruded frames | Galvanized steel sections carry higher load at steel material cost and are repaired with ordinary welding equipment on site. |
Use Guide
Specifying Handling and Welding Notes
- Give the section dimension the wall thickness and the grade together so the quote matches the drawing
- Clean and recoat cut ends and welds because galvanizing burns away locally under welding heat
- Ventilate the workspace when welding zinc coated sections and follow the procedure for galvanized steel
- Choose S355J2H over the lighter EN grades where the frame carries wind or crane loads
- Set the cut length against the member size so the bar does not leave a short unusable offcut
- Stack bundles on timber with air movement between them so white rust does not form on the coating in storage
Questions Buyers Ask
Galvanized Square Pipe FAQ
What sizes of galvanized square pipe can you supply?
The size range runs from 1/2 inch to 48 inch and starts at 21.3mm, with sections outside that listing made to order. Send the section dimension you need with the wall thickness.
How thick can the wall be?
Wall thickness covers SCH5S through SCH160 and XS, spanning 1.65mm to 80mm. Light fencing rails and heavy load bearing posts both sit inside that range.
Our drawing uses JIS grades. Can you match them?
Yes. JIS SS330, SS440, SS490, SPHD and SPHE are carried alongside the ASTM and EN BS ranges, so the grade can be quoted in whichever system the drawing uses.
Is the pipe galvanized before or after it is cut to length?
The section is cut to the ordered length and the surface is galvanized as part of supply. Any cut you make afterwards in your own shop needs to be cleaned and recoated.
What lengths are available?
The standard fixed lengths are 5.8m, 6m and 12m, with 2-12m random as an alternative. A fixed length of your own can be set against your cutting plan.
Which certificates come with the order?
ISO9001, BV, SGS and RoHS certification is stated for this line. Ask for the mill test certificate at order stage so the grade is documented for the project file.
Can we mix section sizes in one shipment?
Yes. Mixed sizes and grades are loaded against one bill of materials, which keeps a frame package on a single shipment and a single document set.
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