Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Square/Rectangle Steel Pipe, Welded Pipe
Welded Square Pipe With Painted Galvanized or 3PE Coated Finish
Welded square and rectangular tube in painted galvanized natural or 3PE coated finish
Welded square pipe is a square or rectangular hollow section formed from strip and closed with a longitudinal weld. Structural fabricators, trailer builders and pipe support contractors specify it where the section carries load and pressure duty is not the governing requirement, because the welded route reaches long lengths in thin walls that a seamless process cannot match economically. Choosing the surface treatment at order stage removes the shop blasting and priming step that otherwise sits between goods inwards and the fabrication bay. Grades cover the ASTM A36 A53 A106 A333 range, the JIS SS330 to SPHE range and the EN BS S185 to S355J2H structural range.
- Product Name — Welded Square Pipe
- Also Known As — Welded square hollow section welded rectangular tube
- Section Shape — Square and rectangular
- Manufacturing Method — Welded
- ASTM Material — A36, A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6
Why It Is Specified
Key Benefits of Welded Square Pipe
Surface Treatment Chosen At Order Stage
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulated finishes are available, so the section arrives in the condition the installation actually needs.
Thin Walls In Long Lengths
The welded route gives light wall sections in 12m lengths, which keeps the number of splices down in long runs of framing and purlin work.
Grades Quoted In Your Own System
ASTM, JIS and EN BS designations are all carried, so a S355J2H specification and an SS490 specification can be priced against the same stock position.
Wall Range From Light Frames To Heavy Posts
Wall thickness runs 1.65mm to 80mm across the SCH5S to SCH160 and XS listing, covering both a light rail and a heavy column from one enquiry.
3PE Coating For Buried And Wet Duty
The anticorrosive 3PE coating option suits sections that are buried, embedded or exposed to persistent wet conditions where paint alone would not last.
Documented Supply
ISO9001, BV, SGS and RoHS certification is stated for this line, which gives your goods inwards process something concrete to check against.
Problems It Solves
What This Material Removes From Your Process
Blasting And Priming Before Fabrication
Natural finish steel has to be cleaned and primed before it can be used. Ordering black painted, galvanized or 3PE coated material moves that operation upstream of the shipment.
Seamless Pricing On A Structural Duty
Seamless sections cost more than a structural frame needs when there is no pressure requirement. The welded route delivers the same section dimension for structural work.
Splices In Long Runs
Short bars force extra joints in long framing runs. Fixed 12m lengths reduce the number of splices and the welding that goes with them.
Buried Steel Failing Early
Painted steel in ground contact corrodes at the soil line. The anticorrosive 3PE coating option addresses the buried length at the point of supply.
Grade Systems Not Matching The Drawing
A drawing in EN grades and a supplier quoting only ASTM leads to a substitution argument. All three systems are carried so the grade is quoted as written.
Application Scenarios
Where It Is Used
Structural Framing and Bracing
Columns, beams and bracing in light steel buildings where a closed section resists twist better than an open profile.
Pipe Racks and Support Steel
Support frames and pipe racks in process plants where the steel sits outdoors and a coated finish is specified from the start.
Trailer Chassis and Body Frames
Chassis rails, body posts and tail lift frames where the flat faces carry panel and hardware mounting.
Buried and Embedded Members
Posts and sleeves that sit in ground or concrete where the 3PE coating option protects the buried length.
Insulated Service Runs
Sections supplied with polyurethane foam insulation where the run has to limit heat transfer along its length.
Furniture Racking and Shelving Frames
Storage racking, workbench frames and shop fittings built in high volume from light wall square tube.
Who It Is For
Buyers Who Specify This Product
- Structural steel fabricators buying welded hollow section for light building frames
- Plant maintenance contractors buying coated support steel for pipe racks and platforms
- Trailer and vehicle body builders buying square tube for chassis and body framing
- Civil contractors buying 3PE coated sections for buried posts and sleeves
- Racking and shelving manufacturers buying light wall square tube in repeat lengths
- Pipe and section distributors stocking painted galvanized and natural finishes side by side
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 | Welded Square Pipe |
|---|---|
| Also Known As | Welded square hollow section welded rectangular tube |
| Section Shape | Square and rectangular |
| Manufacturing Method | Welded |
| 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 Treatment | Black painted, galvanized, natural, anticorrosive 3PE coated, polyurethane foam insulation |
| Place of Origin | China |
| Certificate | ISO9001, BV, SGS, RoHS |
Technical Features
- Square and rectangular hollow section formed by welding
- 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
- Surface treatment black painted galvanized natural anticorrosive 3PE coated or polyurethane foam insulation
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 paint film or 3PE anticorrosive coating applied as the ordered surface treatment
- Polyurethane foam used where an insulated section is ordered
Certification
- ISO9001
- BV
- SGS
- RoHS
Manufacturing
How It Is Made and Processed
Strip forming into the square or rectangular profile
Longitudinal welding to close the section
Sizing to the ordered section dimension and wall thickness
Cutting to 5.8m 6m 12m fixed or 2-12m random length
Surface treatment applied as black painted galvanized natural or 3PE coated
Polyurethane foam insulation applied where ordered
Bundling marking and loading for export
Quality Control
Checks Before It Ships
- Weld line inspected along the length of the section
- Section dimension and squareness checked against the ordered size
- Wall thickness checked across the 1.65mm to 80mm range
- Surface treatment checked against the ordered finish
- Cut length verified before bundling
- Marking and packing confirmed before loading
Customization
What We Can Change on Your Order
- Surface treatment selected per item across painted galvanized natural 3PE coated or foam insulated
- Section size outside the standard listing made to order
- Wall thickness selected across the 1.65mm to 80mm range
- Cut to a fixed length of your own rather than 5.8m 6m or 12m
- Grade quoted in the ASTM JIS or EN BS designation used on your drawing
- Bundle split and marked by frame or by delivery drop
Comparison
Welded Square Pipe Against the Alternatives
| Seamless square pipe | The welded route reaches thin walls and long lengths at lower cost, which suits structural framing where there is no pressure requirement. |
|---|---|
| Round welded tube | Flat faces accept plates brackets and panels with straight cuts, so connection detailing and cladding fixing are simpler. |
| Hot rolled angle and channel | The closed section resists torsion in both axes and gives a cleaner surface for coating with fewer ledges collecting water. |
| Uncoated black section painted in the shop | Ordering the finish with the steel removes an in house blasting and priming step and the floor space it occupies. |
Use Guide
Specifying Handling and Welding Notes
- Name the surface treatment on the order because painted galvanized natural 3PE coated and foam insulated are all supplied from the same section
- Orient the weld seam away from the highest tension face where the detail allows it
- Repair the coating at every cut and weld before the frame is erected especially on galvanized and 3PE coated material
- Specify S355J2H where the frame carries wind crane or impact loading rather than a lighter EN grade
- Keep 3PE coated sections clear of dragging on concrete during handling so the coating is not scored
- Check that the fixed length ordered suits the truck and the site access before the cutting list is released
Questions Buyers Ask
Welded Square Pipe FAQ
What is the difference between welded and seamless square pipe in practice?
The welded section carries a longitudinal weld and reaches thin walls and long lengths economically. For structural framing with no pressure duty that is usually the right choice.
Which surface treatments can you supply?
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulation. Name the finish on the order because the same section is supplied in all of them.
What wall thicknesses are covered?
SCH5S through SCH160 and XS, spanning 1.65mm to 80mm. Send the section dimension with the wall so the quote matches your member schedule.
Can you supply to EN grades such as S355J2H?
Yes. EN BS grades from S185 through S355J2H are carried, along with the ASTM and JIS ranges, so the grade can be quoted exactly as your drawing states it.
How long are the standard bars?
Fixed 5.8m, 6m and 12m, or 2-12m random. A fixed length of your own can be cut against your framing layout.
Is 3PE coating suitable for buried posts?
The anticorrosive 3PE coating option is intended for duty where paint alone does not last, including buried and persistently wet conditions. Tell us the exposure so the right finish is quoted.
What paperwork ships with the pipe?
ISO9001, BV, SGS and RoHS certification is stated for this line. Ask for the mill test certificate with the order so the grade is on file before the material is cut.
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