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 Rectangle and Square Steel Pipe
Square and rectangular welded hollow section finished black galvanized or coated to order
Welded rectangle pipe is a square or rectangular hollow section formed from strip and closed with a longitudinal weld. Structural steel shops, plant contractors, furniture and equipment makers and pipeline support fabricators specify it where a closed section carries load better than an open profile and flat faces make connections simple. Choosing the surface finish at the order stage, from black painted through galvanized to 3PE coating or polyurethane foam insulation, avoids a second contractor and a second delivery. Grades span the ASTM, JIS and EN BS families and lengths are cut fixed or random to suit the yard.
- Product Name — Welded Rectangle Pipe
- Also Known As — Welded square and rectangular hollow section
- 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
Why It Is Specified
Key Benefits of Welded Rectangle Pipe
Surface Finish Decided With the Order
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulated are all offered, so the section arrives in the condition the job needs.
Closed Section Stiffness With Flat Faces
A welded rectangular section resists torsion and bending in two axes while still giving flat faces for bolted cleats, base plates and cladding rails.
Wall From Light Gauge to Heavy Structural
Schedules cover SCH5S to SCH160 and XS, a wall range of 1.65mm to 80mm, so light frames and heavily loaded members are ordered on one line.
Grade Coverage Across Three Standard Families
ASTM A36 A53 A106 and A333, JIS SS330 to SPHE and EN BS S185 to S355J2H mean a drawing from any of the three can be quoted directly.
Length Options That Suit Shipping and Cutting
5.8m and 6m fixed load into a container without waste, 12m fixed suits long members, and 2-12m random is cheaper where short pieces get used.
Insulated Sections for Heat Traced Runs
Polyurethane foam insulation is available on the section itself, which removes a separate lagging step for supports and casing work.
Problems It Solves
What This Material Removes From Your Process
Coating Arranged as a Separate Contract
Sending plain section out for painting or 3PE adds a handling leg and a delay. Ordering the finish with the pipe means one delivery and one responsible supplier.
Open Profiles Twisting Under Load
Channels and angles deflect in torsion where a bracket sits off center. A closed rectangular section carries the same load with less twist at similar weight.
Mixed Standards Across a Multi Country Project
One package may call S355J2H, another SS490 and a third A36. All three families are quoted so the buyer sees the equivalence before committing.
Buying Heavier Section Than the Load Needs
With walls available from 1.65mm to 80mm the section can be matched to the actual load instead of rounding up to the nearest stocked wall.
Application Scenarios
Where It Is Used
Structural Frames and Portal Bracing
Columns, rafters and bracing members in workshops, warehouses and canopies where a closed section keeps the frame compact.
Pipe Racks and Equipment Supports
Sleepers, stanchions and cradles in process plant, often ordered 3PE coated where the support sits in a wet or buried position.
Conveyor and Material Handling Structures
Gantry legs, walkway frames and hopper supports carrying vibration and off center loads.
Furniture Shelving and Display Frames
Light gauge square and rectangular section welded into racking, shelving and shop fittings that are then painted or powder coated.
Transport and Trailer Sub Frames
Chassis rails, body frames and tail lift mounts where flat faces make bolting brackets straightforward.
Insulated Casing and Jacket Supports
Members supplied with polyurethane foam insulation for runs where heat loss through the support matters.
Who It Is For
Buyers Who Specify This Product
- Structural fabricators buying hollow section for portal frames and bracing
- Plant contractors buying coated section for pipe racks and equipment cradles
- Furniture and shop fitting makers buying light gauge square tube for welded frames
- Trailer and body builders buying rectangular section for chassis and sub frames
- Project engineers matching drawings written to ASTM JIS or EN BS grades
- Steel stockists buying mixed finishes to serve both painted and galvanized demand
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 Rectangle Pipe |
|---|---|
| Also Known As | Welded square and rectangular hollow section |
| 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 |
| Outside Diameter | 1/2 inch to 48 inch from 21.3mm or customized |
| Wall Schedule | SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS |
| Wall Thickness | 1.65mm-80mm or customized |
| Length | 5.8m 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
- ASTM grades A36 A53 Gr. A Gr B A106 GR.A GR.B A333 GR1 GR3 GR6
- JIS grades SS330 SS440 SS490 SPHD SPHE
- EN BS grades S185 S235 S235JR S235 G2H S275 S275JR S355JRH S355J2H
- Outside dimension 1/2 inch to 48 inch from 21.3mm or customized
- Wall schedules SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS
- Wall thickness range 1.65mm to 80mm or customized
- Lengths 5.8m and 6m fixed 12m fixed or 2-12m random
- Surface black painted galvanized natural anticorrosive 3PE coated or polyurethane foam insulated
Materials
- Carbon steel strip in ASTM A36 A53 A106 and A333 grades
- Structural steel in JIS SS330 SS440 SS490 SPHD and SPHE
- European structural grades S185 through S355J2H
- Anticorrosive 3PE coating layer where specified
- Polyurethane foam insulation where specified
Certification
- ISO9001
- BV
- SGS
- RoHS
- Mill test certificate supplied with the shipment
Manufacturing
How It Is Made and Processed
decoiling carbon steel strip to the developed width of the section
Roll forming and longitudinal welding into tube
Sizing and shaping into the square or rectangular profile
Straightening and end cutting
Surface treatment by painting galvanizing 3PE coating or foam insulation
Cutting to 5.8m 6m 12m fixed or 2-12m random length
Bundling strapping and loading for export
Quality Control
Checks Before It Ships
- Weld line inspected along the length of the section
- Section dimensions squareness and straightness checked after sizing
- Wall thickness verified against the ordered schedule inside the 1.65mm-80mm range
- Coating condition checked for the ordered painted galvanized or 3PE finish
- Cut lengths confirmed against the ordered fixed or random specification
- Bundle marking and strapping checked before loading
Customization
What We Can Change on Your Order
- Section dimensions produced to your drawing outside the standard list
- Wall thickness set anywhere in the 1.65mm to 80mm range
- Surface supplied black painted galvanized natural 3PE coated or foam insulated
- Cut to your own fixed length instead of 5.8m 6m or 12m
- Grade selected from the ASTM JIS or EN BS family your specification uses
- Bundle configuration and marking arranged for your site
Comparison
Welded Rectangle Pipe Against the Alternatives
| Hot rolled channel or angle | A closed welded section resists torsion in two axes so off center brackets and cantilever loads cause less twist at a similar weight. |
|---|---|
| Round welded pipe | Flat faces let cleats base plates and cladding rails bolt or weld directly instead of needing a saddle cut or a formed seat. |
| Seamless rectangular section | Welded section is produced across a wider size and wall range from 1.65mm to 80mm and suits structural duty where seamless is specified mainly for pressure service. |
| Section coated after fabrication | Ordering black painted galvanized or 3PE finish with the pipe removes a separate coating contract and the transport leg that goes with it. |
Use Guide
Specifying Handling and Welding Notes
- Position the longitudinal weld away from the highest tension face where the design allows
- Choose 3PE coating for buried or permanently wet supports and painted finish for indoor frames
- Order fixed lengths that divide into your member sizes so cutting drop is reduced
- Check the schedule wall against the section size because SCH numbers give different walls at different sizes
- Cap or drain outdoor members so water does not collect inside the closed section
- Ask for the mill test certificate with the shipment so the grade is recorded against the project
Questions Buyers Ask
Welded Rectangle Pipe FAQ
Which surface finishes can you supply on welded rectangle pipe?
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulation. Tell us the service condition and we will confirm which is appropriate.
What is the wall thickness range?
From 1.65mm to 80mm, covering SCH5S through SCH160 and XS. Walls outside the schedule list are quoted as customized.
Can you cut to a length other than 5.8m or 6m?
Yes. 12m fixed and 2-12m random are standard options and any other fixed length is quoted as customized.
Which grades do you hold for structural work?
ASTM A36 and A53, JIS SS330 to SS490 and EN BS S235JR through S355J2H are all quoted. Name the grade your drawing calls out and the material is supplied against it.
Is welded section acceptable where seamless is specified?
That depends on the code your design follows. Send the specification clause and we will confirm whether the welded section meets it or whether seamless is required.
How do you protect the coating in transit?
Sections are bundled and strapped with the finish already applied. State the finish and we will set the packing so painted or 3PE surfaces are not rubbed during loading.
Can you supply square section as well as rectangular?
Yes. Square and rectangular hollow sections come off the same line, so a frame using both profiles is supplied on one order.
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