Square, rectangular and round HSS for wholesale & project orders
We manufacture welded carbon steel hollow sections in China, including ASTM A500 Grade B and Grade C. Order square, rectangular and round profiles from one material list, in 6 m or 12 m lengths or with cutting and finishing to suit your fabrication work.
Square posts, rectangular frame members and round braces can share one shipment, with the required preparation and finish for each profile.
Flat faces on square and rectangular tube provide seating for connection plates. Round braces need their end preparation matched to the adjoining member. Our full-length and cut-piece supply follows the sizes and connection details on your fabrication drawing.
Rectangular base members, square uprights and round supports can require different cuts and surface preparation. Preparing them to their part drawings reduces the cutting and finishing left to the assembly workshop.
| Item | Supply Range |
|---|---|
| Product | Cold-formed welded carbon steel structural tubing |
| Section shapes | Square (SHS), rectangular (RHS) and round (CHS) |
| Standard & grades | ASTM A500/A500M Grade B or Grade C |
| Square selections below | 50 × 50 to 150 × 150 mm; wall range shown for each size |
| Rectangular selections below | 60 × 40 to 200 × 100 mm; wall range shown for each size |
| Round selections below | 48.3, 60.3, 73.0 and 88.9 mm actual OD with listed walls |
| Length formats | 6 m, 12 m or ordered cut lengths |
| Surface options | Black mill finish, oiled, painted or galvanized |
| End condition | Plain-cut ends; additional preparation to the fabrication drawing |
| Additional preparation | Cutting and punching; welded details reviewed with the drawing |
| Material records | Ordered grade and required test results linked to the heat or batch |
| Wholesale delivery | Separate bundle identification for each profile, size and order line |
Each wall range belongs to the outside dimensions on the same row. Select the cross section and nominal wall as a pair.
The linked BAOLAI factory catalog is the source for these HSS selections. Square and rectangular inch values are metric conversions; round inch values retain the catalog dimensions. SHS/RHS rows show nominal wall ranges, while CHS rows pair one OD with one wall.
Swipe left to see all columns.
| Profile | Outside size (mm) | Wall (mm) | Outside size (in.) | Wall (in.) |
|---|---|---|---|---|
| SHS | 50 × 50 | 1.0–5.0 | 1.969 × 1.969 | 0.039–0.197 |
| SHS | 75 × 75 | 1.5–6.0 | 2.953 × 2.953 | 0.059–0.236 |
| SHS | 100 × 100 | 2.3–6.0 | 3.937 × 3.937 | 0.091–0.236 |
| SHS | 150 × 150 | 4.0–8.0 | 5.906 × 5.906 | 0.157–0.315 |
| RHS | 60 × 40 | 1.5–3.5 | 2.362 × 1.575 | 0.059–0.138 |
| RHS | 100 × 50 | 2.0–6.0 | 3.937 × 1.969 | 0.079–0.236 |
| RHS | 150 × 100 | 4.0–12.0 | 5.906 × 3.937 | 0.157–0.472 |
| RHS | 200 × 100 | 4.0–12.0 | 7.874 × 3.937 | 0.157–0.472 |
| CHS | 48.3 | 3.68 | 1.900 | 0.145 |
| CHS | 60.3 | 3.91 | 2.375 | 0.154 |
| CHS | 73.0 | 5.16 | 2.875 | 0.203 |
| CHS | 88.9 | 4.78 | 3.500 | 0.188 |
The Square HSS, Rectangular HSS and Round HSS pages below contain the full shape-specific tables.
Catalog source: BAOLAI welded steel pipe catalog (PDF) — round HSS on page 19; square and rectangular HSS on pages 65–66.
Order full lengths for workshop cutting or prepared pieces from your fabrication drawing. Both can share the material list, with the cutting, finish and quantity priced for each item.
A mixed schedule gives every member its own profile, size, wall, grade, part mark and finish. Full lengths and prepared parts can share a release lot without combining their material or processing quantities.
Black mill-finish sections suit further fabrication and coating. Oil adds temporary handling protection, while paint or galvanizing forms a separate finishing choice. Cutting and welding can affect the finish around the joint, so the order needs to identify whether coating takes place before or after fabrication.
Material records identify the grade and heat or batch for each profile. Dimensional checks cover its outside size, wall, length and prepared features.
Steel strip is formed and welded along a longitudinal seam, then sized for the ordered section. Square and rectangular profiles require checks on their flat faces and corners; round sections require diameter and ovality checks. Cutting and finishing follow the agreed supply condition.
A square tube is checked across both faces; a rectangular tube across its height and width. Round tube is measured across the actual OD. Wall, length, straightness and prepared features are checked against the applicable order requirements, with the specified material tests recorded separately.
Grade and heat or batch references identify the material on each order line.
The inspection scope retains wall and length requirements for each order line, including prepared pieces that share one tube size.
End condition, hole position and other ordered details are checked against the drawing references used for fabrication.
The document list covers the material certificate, required inspection results and packing list. Purchaser witness points or a specified certificate format are included when agreed with the order.
Square, rectangular and round sections are grouped by profile, outside size, wall, grade and length. Bundle references follow the order lines, while cut pieces retain their own counts. The receiving team can match the shipment to the material list without sorting by appearance alone.
Straps and timber bearers support the bundles for handling. Painted or galvanized material needs its contact points considered in the packing plan, particularly when it shares a shipment with black mill-finish sections.
Our factory's usual HSS production reference is 15–30 days, depending on specification and quantity. Cutting, finishing and the shipping schedule affect the complete order timeline. An export quotation separates production readiness from sea freight and the agreed delivery point.
We price each profile, size and grade with its cutting, finish and export scope. FOB, CFR or CIF quotations identify the named port and the transport included.
Minimum quantities are reviewed for each profile, size, wall and preparation. The quote shows any line-specific minimum, including mixed-profile and trial orders.
Mark the changed profiles, sizes, grades, quantities and preparation on the revised list. Those changes need to be reflected in the quotation before order release, so the accepted schedule and supplied members use the same revision.
Yes. Each member line retains its grade and finish, so black, painted or galvanized pieces can be reviewed in the same purchase without merging their material or processing requirements.
The project designer selects section size, grade and connections. Our offer covers manufacturing to that material list. Structural HSS is not supplied as pressure pipe, and changing to another material standard requires a separate review.
Use the full outside height, width and wall, then a part drawing with the cut plane, angle and reference face. This keeps the member orientation and left- or right-hand preparation clear through fabrication.
Attach one material list for all required profiles. Include the standard and grade, outside dimensions, wall, length and quantity per line, plus any cutting or finishing. Add your destination and required arrival date so our quotation covers the material and delivery scope you need.