STKR490 Hollow Section · JIS G 3466 Series
STKR490 Hollow Section
If STKR490 is the grade your design assumes, the useful work happens before anyone quotes — deciding what a replacement would have to demonstrate. Mechanical properties, the impact condition if the service is cold, the dimensional tolerances that keep the connection fitting, and the certificate format your inspector will accept are the four points that decide whether a substitute is equivalent or merely similar. State them with the standard, edition and dimensions.
Price on request · availability, origin and document package confirmed against the live enquiry
Choose the route that fits the requirement
Specify STKR490 Hollow Section around the job
STKR490 Hollow Section is only a useful purchase description when the governing requirement, dimensions, service conditions, testing and document expectations are stated with it. Treat nearby routes as comparisons, not automatic substitutes. Price, stock, origin, certification and delivery timing are confirmed only against the live enquiry. Start with the requirement that decides fit, then provide the missing order inputs.
Governing standard & edition
The designated standard and its edition fix scope, the grade range available, tolerances, testing and ordering requirements. Name the standard and edition exactly — a grade designation is not a specification, and the edition controls the requirements that apply.
Grade designation & project requirement
STKR490 is one input among several, not the whole order. The governing design or project specification can impose requirements beyond the standard, so the two are stated separately and neither is read off the strength class.
Shape, dimensions & tolerance
Section shape, nominal dimensions with units, wall and the applicable tolerance regime fix the piece. A nominal chart value is not an acceptance tolerance unless the governing document says so.
Condition, service & fabrication
Delivery condition, service environment, impact-testing needs and the fabrication route are decided by the cited edition. Order each only where the standard and the service call for it.
Decide what would actually block a substitute
Write down what a substitute has to prove
Higher-strength JIS tube is where substitution pressure is strongest, because the gap between STKR490 and a nearby grade looks small on a schedule but can be large at the detail. Before quoting, decide what a replacement would have to demonstrate — the mechanical properties the design assumes, the impact condition if the service is cold, the dimensional tolerances that keep the connection fitting, and the certificate format your inspector will accept. Naming those four things turns an argument at inspection into a question a supplier can answer in the offer.
Acceptance comparison
Test a proposed substitute against STKR490, criterion by criterion
When a supplier offers a different grade into a line specified as STKR490, the question is not which designation sounds stronger — it is whether the alternative demonstrates each thing the design and the fabrication assume. Work through the criteria below and mark each one accepted, unresolved, or genuinely not comparable. Anything unresolved stays visibly open and becomes a question on the enquiry rather than a check that quietly passes.
Criterion group
Mechanical basis
The design assumes a set of properties. The substitution has to demonstrate the same set from its own governing document — not from a similar-sounding designation.
Strength basis the design assumes
Does the alternative's own governing document state the strength basis the member was designed to?
A higher designation is not evidence that every property the design relies on is equal or better. Compare each property, not the grade label.
Carbon steel hollow sectionDeformation and elongation basis
Is the elongation or ductility provision of the alternative the one the design and any seismic or plastic-design assumption requires?
Strength and deformation behaviour do not move together. A stronger tube is not automatically an equivalent one where the design relies on ductility.
Impact / toughness requirement
If the service is cold or the specification calls for impact testing, does the alternative carry that requirement in its own right?
Impact or toughness testing is a separate requirement from the delivery or heat-treatment condition. Confirm it as its own line rather than reading it off the condition.
Criterion group
Dimensional compatibility
Properties decide the member; dimensions decide whether the fabrication still fits. Both have to hold before a substitution is workable.
Dimensional tolerance regime
Is the alternative supplied under the same tolerance regime your connection details and fit-up assume?
A nominal size being equal does not make the tolerance regime equal. Check the regime against the document that governs the fabrication, not the nominal chart.
Section shape and mass basis
Does the alternative hold the section shape, wall and mass basis the design and the connections were set up around?
A change in wall or mass basis moves the member's own behaviour and the connection detail, even where the outer size is unchanged.
Criterion group
Documentary acceptance
Even a technically sound substitution has to arrive with evidence your inspector will accept. Settle the paperwork before the order is placed, not at delivery.
Certificate format and issuer
Will the certificate the alternative is supplied with be accepted by the inspector and the project's documentation requirement?
The document set that accompanies the tube is part of the acceptance, not an afterthought. Confirm the expected issuer and format up front.
Mild steel hollow sectionTraceability from certificate to consignment
Does the traceability basis link the certificate to the heats and lengths actually delivered?
Traceability is verified against the consignment shipped, so it cannot be confirmed from the grade name or a sample certificate alone.
Acceptance tally
7
criteria unresolved of 7
- Accepted
- 0
- Unresolved
- 7
- Not comparable
- 0
No drop-in upgrade: a higher designation describes one property, not the whole specification. This page does not publish a strength, elongation or toughness table for STKR490 or any alternative, because those values belong to the governing standard and its edition and must be read from the document that actually applies to your order.
Put the unresolved criteria in the RFQNothing entered here is stored or submitted.
Specification gate
Build a checkable enquiry
STKR490 sits in the same standard as the STKR400 route but at a higher strength class, which makes the two easy to conflate — so the gate fixes the exact designation and edition first. It then asks for delivery condition stated separately, thickness and shape, dimensions with units, quantity and unit basis, the fabrication and inspection scope, the document list and the destination. Nothing is inferred from the grade name alone.
RFQ summary
Standards, grades, dimensions & condition
Write the specification so offers can be compared
STKR490 differs from the STKR400 route mainly in its strength class, so the strength class and the delivery condition have to be written separately rather than folded into the grade name. State the standard and edition, the thickness and form, nominal dimensions with units, quantity and unit basis, the fabrication and inspection scope, the documents required and the destination.
Standard, edition & grade designation
The STKR490 designation and the edition you cite fix the symbols available, the grade range, the tolerances, and the testing and ordering requirements. Use the complete designation and state the strength class explicitly, rather than relying on the number in the name — the edition controls which requirements apply.
Dimensions, wall & tolerance regime
State the section family, the nominal dimensions with units, the wall thickness, the length or cut requirement and any surface requirement together, and name the tolerance regime the cited edition references. A nominal chart value is not an acceptance tolerance for STKR490 any more than for any other designation.
Project requirement over the standard
A governing design or project specification can impose requirements beyond the standard. Both are stated explicitly, and neither is inferred from the other — the grade designation alone is not a complete purchase specification.
Reference before ordering
Confirm a size or weight input before it reaches the RFQ
Use a reference to check scope and terminology, then compare that scope with the project requirement. A reference does not replace the contract documents for the actual order.
| Requirement context | Governing basis | Applies to / limitation | Keep as a separate decision | RFQ field |
|---|---|---|---|---|
| Section ordered to a general-structure tube grade | JIS G 3466 series — applicable edition named | Applies where the governing document specifies this standard. Confirm the edition, grade range, tolerances, testing and ordering requirements against the project requirement — the designation alone does not complete the order. | Delivery condition, tolerance regime, toughness / impact testing | Standard / edition + grade |
| Section ordered to a hot-formed structural route | BS EN 10210 series — applicable edition named | A different scope with its own requirements. Close out every input before anything is priced. Until then, a lower-priced designation remains a proposal to test rather than an equivalent you have accepted. | Product form, grade, dimensions, fabrication implications | Standard / edition + dimensions |
| Project specification beyond the standard | Governing project specification / code | Where a project specification imposes requirements beyond the standard, those requirements are ordered explicitly and confirmed against the actual supply. | Supplementary requirements, inspection scope, documents | Supplementary requirements |
This table is a decision aid only and carries no mechanical value or numerical technical value. Technical choices are conditional on the selected standard and grade; every dimension, tolerance, condition or test figure is confirmed against the governing standard, its edition and the material certificate before quotation. Price on request.
Documents & inspection
Match documents and inspection to the order
The document question on a higher-strength order is usually about the format your inspector will accept, not only the results. Name the certificate, the standard and edition it should reference, and the properties you need to see evidenced on it. If a substitute is offered, the paperwork it has to carry is often the point that decides whether it is genuinely equivalent.
- Material certification and traceability for the steel supplied, per consignment
- Chemistry and mechanical test record against the governing standard, edition and grade designation
- Impact / toughness test record only where the standard and order require it
- Dimensional and inspection records where the order requires them
- Condition and surface checks against the agreed route
- Heat / lot traceability to the shipped consignment
- Commercial invoice and packing list
- Shipment / origin documents only where applicable to the consignment
- Customs declaration inputs for the destination
What is evidenced, and what stays order-specific
- Material certification and traceability are requested for the steel supplied, against the governing standard, its edition and the full grade designation — never an assumed certificate.
- Toughness and impact testing are ordered only where the governing standard and the service environment call for them, and the record is named in the enquiry.
- Availability of any certificate or approval is confirmed for the actual supply — not assumed from this page or from a nearby route.
Operating duty
Where operating duty changes the choice
Open an application page when the end use affects what a substitute must demonstrate. A cold-service or high-cycle duty asks more of a replacement grade than a general structural member does. Where the member is used decides how much a substitute has to prove — a cold-service or dynamic duty is far less forgiving of a near-miss grade than a general structural one.
Columns
Column duty: reconcile shape, nominal dimensions, wall, grade designation and the governing design basis before the enquiry is fixed.
Explore ColumnsMachinery frames
Frame context: check whether connection detailing, service environment, finish, inspection or documentation changes the order.
Explore Machinery framesSolar structures
Solar structure service: confirm the exposure condition, tolerance, condition and testing inputs the governing document expects before the specification is frozen.
Explore Solar structuresGCC markets & destination planning
Plan the GCC destination separately from the steel specification
Keep product compliance separate from destination planning. Confirm consignee/importer details, named port or inland delivery point, Incoterms rule and named place, shipment documents, any permit/conformity steps 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
Destination & importer inputs
Move from STKR490 Hollow Section selection to the exact UAE procurement route: carry the standard edition, grade, section shape, nominal dimensions, tolerance regime, quantity and destination emirate so the quotation and document set match the import.
United Arab Emirates hollow-section procurement
Saudi Arabia
Project specification & import inputs
Confirm the standard and edition, grade, shape, nominal dimensions, tolerance regime, quantity and required-on-site date so the estimate and logistics stay aligned to the governing project specification.
Saudi Arabia hollow-section procurement
Bahrain
Industrial supply inputs
Coordinate the standard edition, grade, tolerance and inspection requirements, document list and delivery point to the Bahrain requirement so the section and its document set stay aligned.
Bahrain hollow-section procurement
Kuwait
Contractor procurement inputs
Link section selection and any cutting or processing to the fabrication and inspection needs, with the delivery point and Incoterms named place agreed against the requirement.
Kuwait hollow-section procurement
Oman
Port-oriented supply inputs
Confirm the specification, nominal dimensions, quantity, document package, port and Incoterms rule so the Oman quotation and logistics stay aligned to the order.
Oman hollow-section procurement
Qatar
Specification & delivery inputs
State the standard and edition, grade, shape, nominal dimensions, delivery condition, documents and delivery location so the Qatar quotation is fixed on a verified basis.
Qatar hollow-section procurementCommercial inputs
Commercial inputs that remain quotation-dependent
The commercial inputs that decide this order are the properties a substitute must demonstrate, the standard and edition, the shape and dimensions with units, the quantity and unit basis, the delivery condition, the documents your inspector will accept, the destination and the named Incoterms place. Pricing, availability and delivery timing are checked against the live shipment rather than assumed here.
Packing
Sections bundled, strapped, tagged and marked by shape, nominal size, wall, grade, heat and lot, matched to the declared route. Packing expectations are confirmed in the enquiry.
Delivery point & schedule
Name the consignee or importer, the port or inland delivery point and the required-on-site date. Timing is checked for the live shipment and stated on the quotation.
Incoterms rule & named place
State the Incoterms rule and the named place so packing, transport and document obligations are explicit, and name the party responsible for each action.
Carry the enquiry into the commercial department
Turn the standard and edition, designation, shape, dimensions, the properties a substitute must demonstrate, documents, quantity, destination and Incoterms named place into one copyable summary. The commercial department reviews the specification for consistency before quoting, so a gap between what the design assumes and what is ordered surfaces early.
Price on request — freight, duty, availability and delivery timing are confirmed with your quotation.
Technical reference
Confirm the source scope, then compare it with the requirement
Use the standard to confirm the requirements and test provisions attached to the grade you are asking for, so you know what evidence to expect. It tells you what the material is, not what it may carry, and it does not replace the contract documents.
Japanese Standards Association — JIS G 3466
Published standard scope · reviewed for scope and terminology
JIS G 3466 is the published standard for carbon steel square and rectangular tubes for general structure. Use the edition your contract documents cite to confirm its own published scope and terminology — the tube types it covers, the grade provision it sets and the requirements it places on ordering — then compare that scope with the project requirement for the actual order. JIS editions are revised, so confirm the applicable edition rather than relying on the one shown anywhere else.
What this means for your order: the reference helps fix the questions that must be answered in the RFQ — the standard and edition, the full grade designation, the section shape, the nominal dimensions with units and the tolerance regime. Conformity, certification and commercial outcomes remain separate, verification-dependent steps after the technical product description is complete.
What it does not cover: the reference 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. Verify the purchase order and the current licensed edition, because a project specification can impose requirements beyond the standard.
What a complete enquiry improves
A complete enquiry makes three things easier
When the enquiry states what a substitute would have to prove, the conversation shifts from haggling over a grade name to comparing evidence. That is what makes a lower offer checkable — and what stops a genuine cost saving from being confused with a section that was never equivalent.
Buyer concern
Specification from a grade designation
Evidence-led answer
Every value is forced against the governing standard and edition, the full grade designation, shape, nominal dimensions, tolerance regime and condition — never assumed from the designation alone.
A section whose basis is an auditable, order-driving input set.
Buyer concern
Automatic substitution between nearby grades
Evidence-led answer
The enquiry keeps the standard, edition, grade, product form, delivery condition, dimensions, tolerance regime and testing as separate decisions, so a nearby grade or standard is only a comparison until the governing requirement accepts it.
A section that matches the governing document rather than a similar-sounding grade line.
Buyer concern
Dimension and tolerance ambiguity
Evidence-led answer
Nominal dimensions with units, the tolerance regime referenced by the governing specification, and any length or cut requirement are carried together.
A section a fabricator can cut, weld and re-check against the governing document.
Buyer concern
Undocumented testing or traceability
Evidence-led answer
Testing, inspection and document needs are named explicitly, with the expected issuer, before any value is quoted — and only where the standard and order require them.
An evidence set that matches the steel actually shipped, not an assumed certificate.
Buyer concern
Quotation gaps and destination surprises
Evidence-led answer
Processing, packing, destination, Incoterms named place, documents and required-on-site date are separate explicit fields, never buried in a price.
A quotation that states delivery and import expectations instead of hiding them.
From requirement to quotation
Every step names its owner, input and open item
Seven steps take a grade requirement to a delivered consignment. The substitution question is settled at the first step, where the properties a replacement must demonstrate are written down rather than argued later.
Requirement
Buyer
In: Governing standard and edition, full grade designation, shape, nominal dimensions with units, quantity and unit basis.
Out: Service and governing document defined; route identified.
No standard or edition named.
Next: Name the standard and edition.
Condition & tolerance
Buyer + technical
In: Delivery condition, tolerance regime, length or cut requirement, surface requirement.
Out: Condition and tolerance basis stated.
Condition left implicit.
Next: Fix condition and tolerance inputs.
Tests & documents
Technical / inspection
In: Testing and inspection scope, required document list with expected issuer.
Out: Evidence and document package named.
Documents assumed, not requested.
Next: Confirm the document checklist.
Destination & importer
Buyer + commercial
In: Consignee / importer details, port or inland delivery point, Incoterms rule and named place.
Out: Destination and clearance owner explicit.
Importer or named place not confirmed.
Next: Add importer and named place.
Quotation
Commercial
In: Quantity and unit basis, processing scope, packing, documents and required-on-site date.
Out: Availability, commercial terms and document package confirmed for the live enquiry.
Open items carried into the offer.
Next: Receive the confirmed offer.
Packing & shipping
Supplier / forwarder
In: Strapping, tagging, marking, Incoterms rule, port.
Out: Coordinated to the named delivery point.
Document delay.
Next: Track to the delivery point.
Delivery & follow-up
Commercial
In: Site handover, closed-out documents.
Out: Handed to site with the document set.
Open claims.
Next: Close out.
Review unresolved items before quotation
Standard and edition, the full grade designation, product form, dimensions, condition, testing and document inputs, quantity, destination and commercial terms enter the enquiry together so the specification, the evidence and the delivery terms stay aligned.
Request a QuoteBuyer FAQ
Questions to settle before ordering
The questions that matter when a grade is being considered for substitution — what would block a cheaper alternative, when impact requirements apply, and what the paperwork has to prove.
What would block a lower-priced substitute?
Is a nearby grade automatically equivalent?
When do impact requirements apply?
What belongs in the RFQ?
Qualified RFQ
Request a qualified STKR490 Hollow Section quotation
Send the exact STKR490 designation with its standard and edition, the thickness and product form it applies at, the section shape and dimensions with units, quantity/unit basis, the delivery condition, fabrication or connection notes, the tests and inspection scope, the 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.
Price on request · availability and commercial terms confirmed against the live enquiry
Related routes worth comparing
Open a related page to resolve one decision
STKR490 on its own is a designation, not a procurement route. If the open question is what governs the material or what a replacement would have to demonstrate, the standard and grade index pages address that directly; the structural steel family is a comparison only.
Structural steel products
If the question behind the substitution is whether an open profile would serve, structural steel is the page to compare against. It is a different family with its own standards and connection rules, so any swap is a design decision for the engineer rather than a purchasing one.
Compare the structural steel form