Hollow Sections · Product Types
Product Types
Section shape is a fabrication decision as much as a design one. Circular, rectangular, square, hot finished and oval each carry their own geometry, connection behaviour and dimensional basis, so the useful first step is to match the form to the node detail, the orientation and the member length you already have on the drawing — then confirm the standard, grade and dimensions that go with it. Price, stock, origin and delivery timing are confirmed only against the live enquiry.
Price on request · confirmed against the governing standard/edition and the mill certificate
Choose the route that fits the requirement
Pick the section shape your connection and geometry can accept
Shape is usually the last thing a designer settles and the first thing a fabricator has to build around, so the useful question is not which form is common but which form your node detail, orientation and available length can actually take. Work down the list with the drawing open: circular for a constant profile and a natural weld path, rectangular where depth and width differ and orientation matters, square where the two faces are equal, hot finished where the forming route is part of the specification, and oval where the profile itself is doing the design work.
Circular hollow section
Round, constant outside profile. Connection and fabrication inputs follow from the circular geometry — confirm the shape class before comparing it with any flat-sided alternative.
Cold formed hollow section
Formed from strip and welded along the section. The forming route is a manufacturing distinction that carries its own standard, tolerance and testing basis — it is not interchangeable with a hot-formed route by name.
Rectangular hollow section
Flat-sided with unequal depth and width. Orientation and the governing axis matter to the connection detail, so state the intended orientation in the enquiry.
Square hollow section
Flat-sided with equal depth and width. Corner radius and the flat-face width are geometry inputs that belong in the specification alongside the basic size.
Hot finished hollow section
Produced through a hot-forming route. The delivery condition interacts with the grade and the testing basis, so confirm the standard that governs the finished section rather than assuming it.
Oval hollow section
An elliptical or flattened profile used where the form itself is part of the design intent. Confirm the dimensional basis and whether the shape is a standard product or a bespoke requirement.
Each product form carries its own standard, tolerance and testing basis. Selecting one does not make the others interchangeable — confirm the governing document before treating any two as alternatives.
Route selector
Build a checkable enquiry
The selector starts with the buyer task, then narrows by section form, material route, grade, governing standard, dimensions and destination. It shows only the choices that help resolve the current decision and leaves unsupported fields open. A copyable summary transfers the selected route and unresolved inputs into the RFQ.
Still open
- Buyer task
- Section form
- Governing standard
- Dimensions / units
- Quantity
- Destination
- Required date
Fields left open are carried into the summary as unresolved rather than filled with a default.
Specification summary
liveHollow Section — Product Types RFQ Buyer task: — Section form: — Material route: — Governing standard: — · Grade: — Dimensions / units: — Service environment: — Documents: — Quantity: — Destination: — · Incoterm: — Required date: — Price on request. Confirmed against the governing standard/edition and the mill certificate — never inferred from the section name alone.
The summary carries the selected route and every unresolved input into the RFQ. Availability, grade and documentation are confirmed against the governing standard and the mill certificate — never assumed from the selector alone.
What happens next
- 1
Set the task and form
The buyer task narrows the section form before any grade or standard is chosen.
- 2
Fix the governing document
Standard, edition and grade resolve the scope, tolerances, testing and ordering basis.
- 3
Complete the order inputs
Dimensions, quantity, destination and documents complete what can be quoted.
Write the specification
Write the specification so offers can be compared
The product form decides which requirements apply, so write the section family and the fabrication the member has to serve before the grade is named. Then state the standard and edition, grade or class, nominal dimensions with units, quantity and unit basis, the delivery condition, the tolerance regime, the inspection scope, the documents required and the destination.
Standard and edition
The governing standard and its edition fix scope, grade, tolerances, testing and ordering requirements. Name both so the mechanical and dimensional basis is auditable rather than inferred from a family name.
Grade, class and condition
Give the full grade or class, and record the delivery or heat-treatment condition as a separate field. Condition and toughness testing are distinct decisions and neither follows from the grade label alone.
Dimensions and tolerance basis
State the section family, nominal dimensions with units, length or cut requirement and the tolerance regime that governs acceptance — carried together under one unit system.
Specification route
Reference the exact related standard and accuracy aids
Confirm the hollow-section standard and verify a dimension, size or weight input before it becomes an RFQ ordering basis.
| Product form | Typical governing document | Applies to / limitation | Verify / evidence | RFQ field |
|---|---|---|---|---|
| Circular hollow section (CHS) | Project specification, or a hollow-section standard named by the design code | Applies where a round profile is specified. Confirm the governing edition, grade and tolerance regime rather than assuming them from the shape. | Governing edition, grade, outside diameter, wall thickness, finish, supplementary requirements | Form + standard + dimensions |
| Rectangular / square hollow section | Project specification, or a hollow-section standard named by the design code | Applies where a flat-sided profile is specified. State orientation and the governing axis; corner radius and flat-face width are geometry inputs. | Governing edition, grade, depth × width × wall, corner radius, length | Form + standard + dimensions |
| Hot finished route | Standard covering the hot-formed product; confirm the exact edition | Applies where the delivery condition is specified as hot formed. Condition interacts with grade and testing — do not assume equivalence with a cold-formed route. | Standard and edition, delivery condition, grade, test basis | Form + condition + standard |
| Cold formed route | Standard covering the cold-formed product; confirm the exact edition | Applies where the forming route is specified as cold formed. The route carries its own scope, tolerances and ordering requirements. | Standard and edition, forming route, grade, test basis | Form + condition + standard |
| Oval hollow section | Project specification; confirm whether a standard product or a bespoke requirement | Applies where an elliptical profile is named by the design. Confirm the dimensional basis and manufacturing route explicitly. | Dimensional basis, governing document, manufacturing route, tolerances | Form + dimensions + documents |
This table is a decision aid only. It carries no numerical technical value; every dimension, tolerance, weight or test figure is confirmed against the governing standard, edition and the mill certificate before quotation. Price on request.
Documents & inspection
Match documents and inspection to the order
Ask for each document against the purpose it serves for the section form you selected: material certification and traceability for the section supplied, dimensional records where that form's tolerances must be evidenced, and shipment or origin papers only where they apply. Name the document and its expected issuer. Availability is confirmed for the actual supply, not assumed from this page.
Material certification & traceability
Request the steel certification against the governing standard and grade, with heat or lot traceability to the shipped consignment. The expected issuer is the producing mill or the supplier per the order terms.
Dimensional & inspection records
Where the order requires them, name the dimensional or gauge record and any inspection scope — surface, edge, weld or finish — and state the acceptable basis rather than assuming a default.
Shipment & origin documents
Commercial invoice, packing list, origin and transport documents are requested only where they apply to the consignment, agreed per the Incoterm and the destination rules for the actual goods.
Any certificate, approval or test record is confirmed for the actual supply. Nothing on this page should be read as evidence that a specific document set is held for a specific order.
Operating duty
Where operating duty changes the choice
An application page is worth opening when the end use changes the form you would pick — a node detail, a sightline or an exposure condition can each eliminate a shape that looked fine on paper. Where the use does not affect the form, the type pages above already carry the decision. The same nominal size can be the right shape in one application and the wrong one in another — a truss node, a machinery frame and a balustrade each constrain the form differently.
Truss & lattice members
Governing loads, connection detailing and the inspection scope are driven by the structural analysis, not the section name.
Handrails & architectural
Appearance, finish and corrosion exposure often govern. Structural capacity may be secondary to the surface and geometry requirement.
Machinery frames
Dynamic duty, connection stiffness and the fabrication route can impose requirements a general-structure grade does not address.
Infrastructure & structures
Project specifications commonly add toughness, inspection and documentation requirements beyond the base product standard.
Corrosive environments
Material route, coating or galvanizing become separate decisions that change with exposure and service life expectation.
General fabrication
Where duty is not yet classified, state it as open rather than assuming a default grade — the classification changes the requirement.
A single nominal hollow-section family can carry very different requirements depending on the duty it performs. Confirm the service condition before selecting the form, material route and grade — the application route is a decision input, not a shortcut to a specification.
GCC destination
Plan the GCC destination separately from the steel specification
Keep product compliance separate from destination planning. Confirm consignee and importer details, the named port or inland delivery point, the Incoterms rule and named place, the shipment documents, any permit or conformity step required for the actual goods, and the party responsible for each action. No country card implies a local office, warehouse or stock position.
United Arab Emirates
Form & handling at destination
Confirm how the chosen section form will be handled and stored at the receiving end, with the port or inland delivery point and Incoterm named.
Destination inputs
Saudi Arabia
Form conformity inputs
Where the project fixes the permitted section form, state any conformity step for the actual goods and who owns each action.
Destination inputs
Bahrain
Delivery of the selected form
Set the delivery point and documents for the section form you selected, kept apart from the form decision itself.
Destination inputs
Kuwait
Routing the selected form
Separate the choice of section form from the routing plan, and confirm the commercial terms before quotation.
Destination inputs
Oman
Port routing for the form
Name the port or inland point the selected form is delivered to, so transport obligations are explicit.
Destination inputs
Qatar
Delivery of the chosen form
Confirm delivery place, date and any conformity step, with the section form held as a separate decision.
Destination inputsCountry cards plan the destination, not the supply position. None of them implies a local office, warehouse or stock position, and none of them changes the steel specification.
Enquiry quality
What a complete enquiry improves
A shape name travels between projects; the requirements attached to it do not. Two enquiries can both read “150 x 100 rectangular” and still differ on governing edition, grade, wall tolerance, delivery condition and inspection — which is why comparing offers only works when every supplier has been handed the same named inputs. The selector below exists to make those inputs explicit before anyone quotes, so a low offer can be traced back to the specification it was priced against.
Comparable offers
When the section form, dimensions and unit basis are fixed before enquiry, every offer arrives on the same footing and can be compared on the form that actually suits the fabrication.
Missing evidence found early
Naming tests and documents up front surfaces what is unavailable before shipment, rather than after the consignment has left.
Traceable handover
The fabricator or receiving team gets dimensions, condition, tests and documents traceable to the purchase requirement instead of inferred from a product name.
Governing document
Name the standard and its edition. The edition fixes scope, tolerances, testing and ordering requirements, and gives every later comparison an auditable basis.
Grade, material and condition
Grade and material route are decisions the governing document controls, not free choices. Note the delivery or heat-treatment condition separately from the grade name.
Product form and dimensions
State the section family, the dimensions with their units, the length or cut requirement and the applicable tolerance regime — carried together under one unit system.
Service, testing and documents
Record the service environment, the toughness or impact requirement, the inspection and testing scope, and the documents you need by purpose and expected issuer.
Related routes
Related routes worth comparing
Open a related page only to resolve a specific decision; adjacency is not proof of interchangeability.
Technical reference
Compare the published scope with the project requirement
Use a recognised authority to confirm its own published scope and terminology, then compare that scope with the project requirement.
Reference: ASTM International — ASTM A500/A500M-23. It does not prove Noor Deira Steel inventory, price, certification, local presence or project approval, and it does not replace the contract documents for the actual order.
ASTM A500/A500M — published scopeScope reference checked 2026-10-07.
From requirement to quotation
Every open item stays visibly open
Every open item stays visibly open until the responsible party confirms it. Nothing is silently assumed to move the enquiry forward.
- 1
Define service and governing document
Establish the duty and the standard, edition and code that the project actually permits.
- 2
Fix product form, grade and dimensions
Select the section family and material route, then set the dimensions with units and the tolerance basis.
- 3
Confirm tolerances, condition and fabrication
Record the delivery condition and any cutting, connection or surface requirement that affects supply.
- 4
Name tests and documents
State the testing and inspection scope and the documents required, with the expected issuer.
- 5
Add quantity, destination and terms
Provide quantity and unit basis, destination, Incoterm named place and the required date.
- 6
Review unresolved items before quotation
Leave anything undecided marked open rather than guessing, so the offer is qualified on a verified basis.
Questions to settle
Questions to settle before ordering
Five questions buyers raise before a hollow-section order is released.
Which designation belongs on the RFQ?
Use the governing document, edition and full grade or class rather than a family nickname. A name such as 'hollow section' does not fix scope, tolerances, testing or ordering requirements — the standard, edition, grade, product form and dimensions together are what a supplier can quote against.
Can a nearby grade or standard be substituted?
Only when the project requirement accepts it, after the properties, dimensions and fabrication implications have been checked. Similar designations on this page are comparison paths only; adjacency is not proof of interchangeability, and no automatic substitution should be assumed between nearby routes.
Which dimensions govern acceptance?
The ordered dimensions and the tolerance regime referenced by the governing specification. A nominal chart value is not an acceptance tolerance unless the governing document says so — state the dimensions with units, the tolerance basis and the length or cut requirement together.
What should be confirmed commercially?
Quantity and unit basis, processing, destination, the Incoterm named place, documents and the required date. Price and availability remain enquiry-specific: they are confirmed against your exact specification and destination rather than stated on this page.
How are documents and inspection agreed?
Ask for each document against the purpose it serves for the form you selected — material certification and traceability for the section supplied, dimensional records where that form's tolerances have to be evidenced, and origin or shipment papers only where they apply to the consignment. Name the document and who is expected to issue it; availability is confirmed for the actual supply rather than assumed from this page.
Request a quotation
Request a qualified Product Types quotation
Send the governing standard and edition, grade or material route, section shape and dimensions with units, quantity and unit basis, intended service, fabrication or connection notes, tests and inspection, required documents, destination and named delivery place. If an item is still undecided, mark it open rather than guessing.
The quotation will confirm availability, commercial terms and the supply-specific document package.
- Offers compared on the same technical basis
- Missing evidence found before shipment
- Dimensions, condition, tests and documents traceable to the requirement
Price on request. Availability, origin and delivery timing are confirmed against your exact specification and destination.