Shandong Tianyu Metal Products Co., Ltd. · Liaocheng, Shandong, China [email protected] +86 199 6352 2611
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Seamless Steel Pipe, Square/Rectangle Steel Pipe

Seamless Rectangular Hollow Section Steel Tube

Rectangular hollow section with no joint around it for frames columns and structures

Seamless rectangle pipe is a rectangular hollow section produced by the seamless route, so it is a long pipe of steel with a hollow section and no joint around it rather than a formed and welded tube. It is specified by structural fabricators and machine builders who want the flat faces of a rectangular section for bolting, plating and clean welded joints, but without a corner or seam weld running the length of the member. Ordering it in the ASTM, JIS and EN BS grade families together means a drawing written to A36, SS400 class Japanese grades or S355J2H can be filled without reworking the material call-out.

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  • Product Name — Seamless Rectangle Pipe
  • Also Known As — Seamless rectangular hollow section rectangular steel tube
  • Section Shape — Rectangular hollow section
  • Material ASTM — A36, A53 Gr. A, Gr B, A106 GR.A GR.B, A333 GR1 GR3 GR6
  • Material JIS — SS330, SS440, SS490, SPHD, SPHE
Why It Is Specified

Key Benefits of Seamless Rectangle Pipe

Flat Faces Without a Longitudinal Weld

You get the bolting and plating advantages of a rectangular section while keeping a hollow section with no joint around it, which removes the seam that welded hollow sections carry.

Three Standard Families on One Material List

ASTM A36 A53 and A106, JIS SS330 SS440 SS490 SPHD and SPHE, and EN BS S185 S235 S275 and S355 sub-grades are all quoted, so a mixed international drawing set does not need a substitution note.

Higher Strength Grades for Loaded Members

S355JRH and S355J2H sit in the same list as the mild S185 and S235 grades, so the heavily loaded members can be stepped up while the rest of the frame stays on the cheaper grade.

Low Temperature Grades Available

A333 GR1 GR3 and GR6 are on the material list, which covers rectangular members in cold climate and refrigerated structures.

Wall Thickness From Light to Heavy

Wall runs from 1.65mm to 80mm across the schedule range, so a light architectural frame and a heavy machine base can be drawn from the same supply.

Finished in the Protection System You Specify

Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulated finishes are applied before shipment so the section is protected in transit and on site.

Problems It Solves

What This Material Removes From Your Process

Seam Weld Running Through a Loaded Face

Formed and welded hollow sections carry a longitudinal weld that sometimes lands where a bracket or a cut-out goes. The seamless route gives a section with no joint around it.

Drawings Written to Three Different Standards

A project with ASTM, JIS and EN BS drawings usually splits across suppliers. A36, SS330 through SS490 and S185 through S355J2H are all on this material list.

Grade Downgraded Because of Availability

Substituting a lower grade to get delivery weakens the design margin. S355JRH and S355J2H are held alongside the mild grades so the specified grade can be kept.

Sections Arriving Rusted Before Erection

Bare sections that sit in a yard need cleaning before painting. Black paint, galvanizing or 3PE coating applied at the mill removes that rework.

Mixed Length Deliveries Wasting Material

Choosing 5.8m, 6m or 12m fixed lengths against the cutting list rather than accepting 2-12m random reduces the drop left in the shop.

Application Scenarios

Where It Is Used

Machine Frames and Equipment Bases

Rectangular members welded into machine frames where flat faces make mounting plates and guide rails straightforward to fit.

Structural Columns and Beams

S275 and S355 rectangular sections used as columns and beams in industrial buildings and platform structures.

Architectural and Curtain Wall Framing

S185 and S235 light sections used in framing where the visible flat face is part of the finished appearance.

Handling and Conveyor Structures

Rectangular members in conveyor gantries, walkways and support frames where plated connections are common.

Low Temperature Structural Work

A333 GR1 GR3 and GR6 rectangular sections in cold store and refrigerated plant framing.

Trailer and Vehicle Chassis Fabrication

Rectangular sections welded into chassis rails and subframes where the flat face carries bolted brackets.

Who It Is For

Buyers Who Specify This Product

  • Structural fabricators buying rectangular hollow sections for columns beams and platform frames
  • Machine builders specifying rectangular members for equipment bases and guarding frames
  • Design engineers working to a JIS drawing who need SS330 SS440 or SS490 rather than an ASTM equivalent
  • Trailer and chassis shops sourcing rectangular rails in a defined grade
  • Contractors closing out a structural package with a mix of S235 S275 and S355 sub-grades
  • Stockists adding rectangular seamless sections to a round pipe inventory
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.

Seamless Rectangle Pipe specifications
Product NameSeamless Rectangle Pipe
Also Known AsSeamless rectangular hollow section rectangular steel tube
Section ShapeRectangular hollow section
Material ASTMA36, A53 Gr. A, Gr B, A106 GR.A GR.B, A333 GR1 GR3 GR6
Material JISSS330, SS440, SS490, SPHD, SPHE
Material EN BSS185, S235, S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H
Size Reference1/2 inch to 48 inch, from 21.3mm, or customized
Thickness SchedulesSCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160, XS
Wall Thickness1.65mm - 80mm or customized
Length5.8m, 6m Fixed, 12m Fixed, 2-12m Random or customized
Surface TreatmentBlack painted, galvanized, natural, anticorrosive 3PE coated, polyurethane foam insulation
Place of OriginChina
CertificateMill test certificate

Technical Features

  • Rectangular hollow section produced by the seamless route with no joint around it
  • 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
  • Wall thickness schedules SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS
  • Wall thickness 1.65mm to 80mm or customized
  • Length 5.8m and 6m fixed 12m fixed or 2-12m random or customized
  • Surface black painted galvanized natural anticorrosive 3PE coated or polyurethane foam insulated

Materials

  • ASTM structural and pressure grades A36 A53 and A106
  • ASTM A333 GR1 GR3 and GR6 for low temperature service
  • JIS hot rolled structural grades SS330 SS440 SS490 SPHD and SPHE
  • EN BS structural grades S185 S235 S235JR S235 G2H S275 and S275JR
  • EN BS hollow section grades S355JRH and S355J2H

Certification

  • ISO9001
  • BV
  • SGS
  • RoHS
  • Mill test certificate supplied with each shipment
Manufacturing

How It Is Made and Processed

  1. Billet heating and piercing to open the hollow shell

  2. Hot rolling and elongating the seamless shell

  3. Forming the shell to the rectangular section profile

  4. Sizing the wall thickness to the ordered schedule or millimetre dimension

  5. Straightening and corner profile checking

  6. Cutting to 5.8m 6m 12m fixed or 2-12m random length

  7. Painting galvanizing coating or insulating then bundling for export

Quality Control

Checks Before It Ships

  • Section width height and corner profile checked against the ordered size
  • Wall thickness verified across the flat faces and at the corners
  • Mill test certificate issued against the ordered ASTM JIS or EN BS grade
  • Straightness and twist inspected over the cut length
  • Surface treatment condition confirmed before bundling
  • Bundle count and marking reconciled with the packing list
Customization

What We Can Change on Your Order

  • Section dimensions customized outside the standard size table
  • Wall thickness customized between 1.65mm and 80mm where no schedule matches
  • Grade chosen from the ASTM JIS or EN BS list to match the drawing call-out
  • Cut length set to 5.8m 6m 12m fixed or 2-12m random against your cutting list
  • Surface system chosen from black paint galvanizing natural 3PE or polyurethane foam insulation
  • End condition supplied plain or prepared for welding
Comparison

Seamless Rectangle Pipe Against the Alternatives

Welded rectangular hollow sectionThe seamless route leaves no joint around the section, so there is no longitudinal seam to avoid when placing brackets holes or cut-outs.
Seamless round pipeFlat faces make bolted brackets, base plates and flush plated joints simpler than fitting to a curved surface.
Built up box section from plateA single rolled section removes four corner welds and the distortion and straightening work that comes with them.
Hot rolled I beamA closed rectangular section carries torsion better than an open beam profile and gives a clean face on all four sides.
Use Guide

Specifying Handling and Welding Notes

  • Give the section width height and wall thickness together since the schedule reference alone does not fix a rectangular profile
  • Name the grade family on the order because A36 SS490 and S355J2H are tested to different standards
  • Step up to S355JRH or S355J2H only on the loaded members and keep the mild grades elsewhere to control cost
  • Choose fixed 5.8m 6m or 12m lengths when cutting against a fabrication list and random 2-12m only when mixed lengths are acceptable
  • Order galvanizing or paint at the mill when the sections will sit in a yard before erection
  • Ask for the mill test certificate with the delivery so the grade is recorded in the structural handover file
Questions Buyers Ask

Seamless Rectangle Pipe FAQ

Which grades can I get in a rectangular section?

ASTM A36, A53 Gr A and Gr B, A106 GR.A and GR.B and A333 GR1 GR3 GR6, the JIS grades SS330 SS440 SS490 SPHD and SPHE, and the EN BS grades from S185 up to S355J2H.

Is there really no weld seam in this section?

The pipe is produced by the seamless route, which gives a hollow section with no joint around it, then formed to the rectangular profile.

What wall thicknesses are available?

The schedule range covers SCH5S through SCH160 and XS, which is 1.65mm to 80mm in millimetres, and a customized wall can be produced between those steps.

Can I order a size that is not in your standard table?

Yes. Section dimensions and wall thickness can both be customized. Send the profile from your drawing with the grade and length required.

Do you supply the sections galvanized?

Galvanized, black painted, natural, anticorrosive 3PE coated and polyurethane foam insulated finishes are all available before shipment.

Which JIS grade matches S275 on my drawing?

SS400 class grades such as SS440 are the usual comparison but the match depends on your design code. Send the drawing and we will confirm rather than swapping the grade ourselves.

What lengths do you cut to?

5.8m and 6m fixed, 12m fixed or 2-12m random, and a customized cut length can be arranged against your fabrication list.

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