Galvanized Seamless Rectangle Steel Pipe
Jointless hollow section with a zinc coated surface in schedule wall thicknesses
Specifications
Seamless Steel Pipe, Square/Rectangle Steel Pipe
Seamless Square Pipe for Machine Frames and Heavy Wall Sections
Square hollow section with no longitudinal joint for machine frames and heavy wall duty
Seamless square pipe is a square or rectangular hollow section produced without a longitudinal joint anywhere around the profile. Machine builders, boom and lift fabricators and equipment OEMs specify it where the section is machined, highly stressed or subject to cyclic loading and a weld line in the wall would become the first thing to check. Taking the seam out of the section also takes it out of every downstream inspection, drilling and welding decision, which shortens the engineering argument on a load bearing member. Material coverage spans the ASTM A36 A53 A106 and A333 range, the JIS SS330 to SPHE range and the EN BS S185 to S355J2H structural range.
- Product Name — Seamless Square Pipe
- Also Known As — Seamless square hollow section seamless rectangular tube
- Section Shape — Square and rectangular
- Manufacturing Method — Seamless
- ASTM Material — A36, A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6
Why It Is Specified
Key Benefits of Seamless Square Pipe
No Longitudinal Joint In The Wall
The section is formed as a continuous hollow profile, so there is no weld line to orient, inspect or avoid when drilling and welding brackets onto a face.
Heavy Wall Available For Stressed Members
Wall thickness reaches 80mm at the top of the SCH160 and XS listing, which suits pins bosses and machined seats cut straight into the section.
Predictable Behavior Under Cyclic Load
A uniform wall around the profile removes the seam as a fatigue initiation point on booms arms and frames that cycle through their working life.
Grade Choice Across Three Systems
ASTM, JIS and EN BS designations are carried, so an A36 drawing and an S355J2H drawing are quoted from the same material list.
Cold Service Grades In The Range
A333 GR1 GR3 and GR6 sit alongside the structural grades for equipment that has to work at low ambient temperature.
Finish Applied Before Shipment
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulated finishes are available so the section arrives ready for assembly.
Problems It Solves
What This Material Removes From Your Process
Weld Seam Governing The Inspection Plan
A welded section puts a line in the wall that has to be located, oriented and checked. A seamless profile removes that from the drawing and from the inspection routine.
Fatigue Cracks Starting At The Seam
Cyclically loaded booms and arms tend to crack where a weld meets the parent wall. The seamless section takes that initiation point out of the member.
Machining Into A Welded Wall
Cutting a bore or a seat across a weld line gives inconsistent material response. A continuous wall machines the same on every face.
Thick Wall Sections Hard To Source
Walls toward 80mm are often quoted only as fabricated boxes. Sourcing them as a hollow section removes the fabrication and the distortion that comes with it.
Separate Coating Step After Delivery
Painting or coating a finished frame adds a stage after fabrication. Ordering the surface treatment with the section moves that work upstream.
Application Scenarios
Where It Is Used
Machine Frames and Bases
Machine tool bases, press frames and welded equipment structures where flatness and a uniform wall matter for alignment.
Boom Arms and Lifting Structures
Telescopic sections, boom arms and lift frames where cyclic loading makes a weld free wall worth specifying.
Hydraulic and Pneumatic Component Bodies
Sections machined into cylinder bodies, manifold blocks and mounting bosses where the bore and the faces are cut from the wall.
Agricultural Implement Frames
Toolbars, hitch frames and implement beams that see shock loading in field work.
Heavy Structural Nodes
Column stubs and node sections in structures where a thick wall carries concentrated load at a connection.
Low Temperature Equipment Structures
Frames and supports in A333 grades for machinery operating in cold climate conditions.
Who It Is For
Buyers Who Specify This Product
- Machine builders buying square section for frames bases and welded structures
- Crane and access equipment fabricators buying heavy wall sections for booms and lift frames
- Hydraulic component manufacturers buying square bar stock for machined bodies and bosses
- Agricultural implement makers buying toolbar and hitch frame sections in repeat sizes
- Structural fabricators buying thick wall nodes where a connection concentrates load
- Industrial distributors carrying seamless hollow section for machine shops and repair workshops
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 | Seamless Square Pipe |
|---|---|
| Also Known As | Seamless square hollow section seamless rectangular tube |
| Section Shape | Square and rectangular |
| Manufacturing Method | Seamless |
| 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 with no joint around the profile
- 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
- Paint zinc or 3PE anticorrosive coating applied as the ordered surface treatment
Certification
- ISO9001
- BV
- SGS
- RoHS
Manufacturing
How It Is Made and Processed
Seamless hollow section forming with no longitudinal joint
Shaping to the ordered square or rectangular profile
Wall thickness produced to the ordered schedule up to 80mm
Cutting to 5.8m 6m 12m fixed or 2-12m random length
Surface treatment applied as painted galvanized natural or 3PE coated
Marking with grade and size
Bundling and loading for export
Quality Control
Checks Before It Ships
- Grade confirmed against the ordered ASTM JIS or EN BS designation
- Profile dimension and corner condition checked against the ordered size
- Wall thickness measured across the faces up to the 80mm limit
- Surface treatment checked against the ordered finish
- Cut length and end condition verified before bundling
- Bundle marking checked against the packing list before loading
Customization
What We Can Change on Your Order
- Profile dimension outside the standard listing produced to order
- Heavy wall selected up to 80mm for machined and highly stressed members
- Cut to a fixed length of your own rather than 5.8m 6m or 12m
- Grade selected across the ASTM JIS and EN BS ranges including A333 for cold service
- Surface treatment set per item from painted galvanized natural 3PE coated or foam insulated
- Bundle and marking arranged to match your assembly kit numbering
Comparison
Seamless Square Pipe Against the Alternatives
| Welded square pipe | There is no longitudinal joint in the wall, which removes the seam from fatigue assessment inspection and machining decisions on a stressed member. |
|---|---|
| Fabricated box section from plate | A formed hollow section avoids the four corner welds and the distortion and straightening work that come with a welded box. |
| Seamless round pipe | Flat faces allow direct mounting and straight cut connections without saddle profiling on machine frames and equipment structures. |
| Solid bar machined to shape | The hollow section keeps section modulus while removing the material and the machining time that a solid bar would require. |
Use Guide
Specifying Handling and Welding Notes
- State the profile dimension and the wall thickness together so heavy wall material is quoted correctly
- Use A333 GR1 GR3 or GR6 rather than a general structural grade where equipment works at low ambient temperature
- Allow for the internal corner radius when planning bore positions and machined seats
- Preheat and follow a procedure suited to the grade when welding heavier walls toward the 80mm end of the range
- Repair painted or coated surfaces at every cut and weld before the assembly leaves the shop
- Support long 12m bars at several points during handling so the section is not bent before it reaches the fixture
Questions Buyers Ask
Seamless Square Pipe FAQ
Why choose a seamless square section over a welded one?
There is no longitudinal joint in the wall, so nothing has to be oriented, inspected or avoided when machining or welding onto a face. That matters most on cyclically loaded and machined members.
How heavy a wall can you supply?
Wall thickness covers SCH5S through SCH160 and XS, reaching 80mm. Give the profile dimension with the wall so the heavy sizes are quoted against the right stock.
Can the section be machined into component bodies?
Yes. A continuous wall machines consistently around the profile, which is why it is used for cylinder bodies bosses and machined seats. Allow for the internal corner radius in the bore layout.
Do you carry low temperature grades in this section?
A333 GR1, GR3 and GR6 are part of the material range. Tell us the minimum service temperature so the grade is confirmed before the order is placed.
What surface options are available?
Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulation. Natural finish is the usual choice where you will machine or coat the part yourself.
Which lengths can be cut?
Fixed 5.8m, 6m and 12m, or 2-12m random. Cut lengths matched to your assembly kit reduce the offcut left in your workshop.
What certification do you issue for this section?
ISO9001, BV, SGS and RoHS certification is stated for this line. Ask for the mill test certificate with the order so the grade is recorded before machining starts.
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