Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Galvanized Steel Pipe, Seamless Steel Pipe
Galvanized Seamless Square Steel Tube with Schedule Wall Thickness
Jointless square section with heavy schedule walls and a zinc coated surface
Galvanized seamless square steel pipe is a long pipe of steel with a hollow section and no joint around it, with the outer surface galvanized after forming. Fabricators choose it over welded square tube where the member has to be machined, drilled or loaded hard enough that a longitudinal weld would become the first thing to fail, and it is offered in A53 Gr A and Gr B, A106 Gr A and Gr B, A333 Gr 1 Gr 3 and Gr 6, and S355JR S355JO and S355J2. Having the heavy schedule walls up to 80mm available in a square profile removes the usual workaround of fabricating a box from four plates and welding the corners. Lengths come 5.8m and 6m fixed, 12m fixed, or 2-12m random.
- Product Name — Galvanized Seamless Square Steel Pipe
- Description — Long pipe of steel with hollow section and no joint around it with a galvanized surface
- Material — A53 Gr A Gr B A106 Gr A Gr B A333 Gr 1 Gr 3 Gr 6 S355JR S355JO S355J2
- Outside Diameter — 1/2 inch to 48 inch or customized
- Thickness Schedules — SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS
Why It Is Specified
Key Benefits of Galvanized Seamless Square Steel Pipe
A Box Section Without Corner Welds
The section has no joint around it, so there are no corner seams to prepare weld and inspect the way a plate fabricated box needs. That removes a fabrication step and the distortion that comes with it.
Heavy Walls In A Square Profile
Wall goes from 1.65mm up to 80mm through the SCH5S to SCH160 range, which covers square members that are normally only available as built up boxes.
Machinable Wall For Drilled And Bored Features
A jointless wall means a hole can be drilled or bored anywhere on the face without hitting a weld line with different hardness and different chemistry.
Four Grade Families On One Order
A53 for general use, A106 for elevated temperature duty, A333 for low temperature service and S355 for structural loading all come from the same range.
Zinc Coating For Outdoor And Buried Positions
The galvanized surface protects the member where it is exposed to weather soil or wash down without a shop painting stage.
Fixed Or Random Length Supply
5.8m, 6m and 12m fixed lengths suit a repeating member, while 2-12m random lets a cutting shop nest its list and cut the scrap out.
Problems It Solves
What This Material Removes From Your Process
Welding Boxes Up From Four Plates
A fabricated box needs four corner welds, weld preparation, inspection and straightening after distortion. A section with no joint around it arrives as one piece.
Drilled Holes Landing On A Weld Line
In a welded tube the seam has different hardness and different residual stress. A seamless wall lets a hole go anywhere on the face without a machining surprise.
Square Members Not Available In Heavy Wall
Light welded square tube tops out well below what some frames need. Schedule walls up to 80mm bring the heavy end of the range into a square profile.
Corrosion On Outdoor Structural Members
Members painted in the shop need recoating once they have been handled and erected. A galvanized surface reaches the structure already protected.
Cold Service Handled As An Afterthought
Substituting an ambient grade into a low temperature position risks brittle behavior. A333 Gr 1 Gr 3 and Gr 6 are quoted from the same list so the right grade is used from the start.
Application Scenarios
Where It Is Used
Heavy Machine Bases And Equipment Frames
Thick wall square members used where the frame is bolted bored and aligned rather than just welded together.
Crane And Lifting Equipment Components
Square sections in booms and outrigger housings where load path and wall integrity matter more than section weight.
Low Temperature Plant Supports
A333 Gr 3 and Gr 6 square members used around cold service equipment where impact toughness governs.
Marine Deck And Coastal Structures
Galvanized members on decks jetties and shoreline equipment in salt laden air.
Hydraulic Cylinder And Actuator Housings
Seamless square sections used as housings and guides where the bore has to be finished after forming.
Foundation Sleeves And Ground Sockets
Heavy wall square sections cast into concrete or driven as sockets for post and column bases.
Who It Is For
Buyers Who Specify This Product
- Machine builders buying square sections that will be bored drilled and aligned after delivery
- Lifting equipment manufacturers specifying seamless square members for boom and housing components
- Cryogenic and cold service contractors buying A333 Gr 6 square supports
- Marine and jetty contractors sourcing galvanized square members for coastal exposure
- Fabricators replacing plate built boxes with a jointless square section to cut welding hours
- Stockists carrying schedule wall square tube from SCH5S through SCH160
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 Seamless Square Steel Pipe |
|---|---|
| Description | Long pipe of steel with hollow section and no joint around it with a galvanized surface |
| Material | A53 Gr A Gr B A106 Gr A Gr B A333 Gr 1 Gr 3 Gr 6 S355JR S355JO S355J2 |
| Outside Diameter | 1/2 inch to 48 inch or customized |
| Thickness Schedules | SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS |
| Wall Thickness | 1.65mm to 80mm or customized |
| Length | 5.8m 6m fixed 12m fixed 2-12m random or customized |
| Technique | Seamless |
| Surface | Galvanized |
| Certification | ISO9001 BV SGS RoHS |
| Place of Origin | China |
Technical Features
- Hollow square section with no joint around it
- Galvanized outer surface applied after forming
- A53 Gr A and Gr B carbon steel
- A106 Gr A and Gr B for elevated temperature duty
- A333 Gr 1 Gr 3 and Gr 6 for low temperature service
- S355JR S355JO and S355J2 structural material
- Schedule walls SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS from 1.65mm to 80mm
- Lengths 5.8m 6m fixed 12m fixed or 2-12m random or customized
Materials
- A53 Gr A and Gr B carbon steel for general duty
- A106 Gr A and Gr B for elevated temperature service
- A333 Gr 1 Gr 3 and Gr 6 low temperature carbon steel
- S355JR S355JO and S355J2 structural steel
- Zinc coating on the outer faces of the finished section
Certification
- ISO9001
- BV
- SGS
- RoHS
- Mill test certificate supplied with the shipment
Manufacturing
How It Is Made and Processed
Billet piercing to produce a hollow section with no joint around it
Hot rolling and elongation to the ordered wall
Forming to the square profile with the corner radii set
Sizing and straightening to the ordered outside dimensions
Galvanizing of the outer surface
Cutting to 5.8m 6m 12m fixed or 2-12m random lengths
Dimensional and visual inspection
Bundling strapping and marking for export
Quality Control
Checks Before It Ships
- Grade verified against A53 A106 A333 or S355 as ordered
- Wall thickness measured against the nominated schedule from SCH5S to SCH160
- Face width and squareness checked after sizing
- Zinc coverage inspected on all four faces and the corners
- Length checked against the fixed or 2-12m random order
- Mill test certificate issued for the material supplied
Customization
What We Can Change on Your Order
- Square face dimensions customized outside the published 1/2 inch to 48 inch range
- Wall nominated by schedule or directly between 1.65mm and 80mm
- Grade selected per item across A53 A106 A333 and S355
- Fixed 5.8m 6m or 12m lengths or 2-12m random to match the cutting list
- Customized cut lengths supplied against your member schedule
- Marking and bundling arranged for your handling equipment
Comparison
Galvanized Seamless Square Steel Pipe Against the Alternatives
| Welded square hollow section | There is no joint around the seamless section, so no seam to align away from drilled holes or to inspect after loading. |
|---|---|
| Box section fabricated from four plates | The section arrives as one piece, which removes four corner welds the associated preparation and the straightening after weld distortion. |
| Bare seamless square tube | The galvanized outer surface protects the member in outdoor buried and wash down positions without a shop painting stage. |
| Light wall welded square tube | Schedule walls up to 80mm put heavy sections into a square profile that thin welded tube cannot cover. |
Use Guide
Specifying Handling and Welding Notes
- Give the face dimensions the wall schedule and the grade together so the section can be confirmed against the published range
- Pick A106 for elevated temperature positions and A333 where the design temperature drops into low temperature service
- Grind the zinc back from weld areas before joining and reinstate the coating on the finished joint
- Plan machined features away from the corner radii where the wall shape changes
- Use 2-12m random supply when your cutting list can be nested and fixed lengths when members repeat
- Store bundles on bearers with air gaps so moisture does not stay trapped against the coated faces
Questions Buyers Ask
Galvanized Seamless Square Steel Pipe FAQ
How heavy a wall can you supply in square section?
Wall runs from 1.65mm to 80mm across SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160 and XS.
Can we machine into the face of this section?
Yes. There is no joint around the section, so a drilled or bored feature does not have to be placed away from a weld line.
Which grade should we use for a cold service support?
A333 Gr 1, Gr 3 and Gr 6 are the low temperature grades on the list. Send the design temperature and the grade will be confirmed against it.
What lengths do you cut?
5.8m and 6m fixed, 12m fixed, or 2-12m random. Customized lengths are cut to your member schedule.
Is a sample or trial length available before a full order?
Send the face size, wall schedule and grade you want to evaluate and we will confirm what can be released for your trial.
Do you supply outside dimensions beyond the standard range?
The published range covers 1/2 inch to 48 inch, and anything outside it is quoted as customized. Give the outside dimensions and wall you need.
What documentation comes with the material?
A mill test certificate for the supplied grade, and the product is covered by ISO9001, BV, SGS and RoHS certification.
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