AS/NZS 4671:2019 · D500N / D500E · BAR SIZE & DUCTILITY SELECTION
Source AS/NZS 4671 reinforcing bar with clearly defined 500N and 500E options, nominal weights, chemical controls and lot-specific testing. Send your bar schedule, specified standard and delivery requirements for a project-based quotation.
Compare 500N and 500E ↓
Grade availability, production origin, project certifications and lead times are confirmed for the actual enquiry.
Use one purchasing hub for both 500N normal-ductility reinforcing bar and 500E earthquake-ductility rebar while keeping market-specific sizes and design acceptance separate.
The joint Australian/New Zealand standard defines requirements for reinforcing steel used in concrete, including chemical composition, characteristic mechanical properties, geometry, marking and product conformity.
Its full scope also includes plain/deformed bars, coils, welded mesh and continuously threaded products. This category page concentrates on ribbed reinforcing bars, with detailed 500N and 500E pages available below.
Start with the approved construction drawings, destination market and specified ductility class. Select the local nominal diameter series, delivery form, piece length, quantity and required conformity documents.
Share the grade, diameter list, lengths and required compliance documents to confirm the supply route.
Two detailed pages cover different ductility and specification requirements. Select by the approved design rather than the yield-strength number alone.
Grade D500N: Class N normal ductility, 500–650 MPa characteristic yield window, ≥1.08 characteristic tensile/yield ratio and ≥5.0% characteristic Agt.
Grade D500E: Class E seismic ductility, 500–600 MPa characteristic yield window, 1.15–1.40 characteristic ratio and ≥10.0% characteristic Agt.
Attach the project's approved design and inspection requirements to avoid grade substitutions.
The key procurement difference is ductility and acceptance criteria, not the shared 500 MPa nominal strength grade.
| Specification parameter | 500N — Class N | 500E — Class E |
|---|---|---|
| Ductility class | Normal (N) | Earthquake (E) |
| Characteristic lower yield stress | ≥500 MPa | ≥500 MPa |
| Characteristic upper yield stress | ≤650 MPa | ≤600 MPa |
| Characteristic Rm/Re lower | ≥1.08 | ≥1.15 |
| Characteristic Rm/Re upper | Not specified | ≤1.40 |
| Characteristic total elongation Agt | ≥5.0% | ≥10.0% |
| Cast carbon-equivalent CEV ceiling | ≤0.44% | ≤0.49% |
| Product-analysis CEV ceiling | ≤0.46% | ≤0.51% |
| Typical size reference | Australia: N10–N50 | New Zealand: D10–D50 nominal series; verify sizes |
Match material conformity to the purchasing contract, approved reinforcement drawings and any supplementary project specifications.
Every quotation should state both the grade and destination-market size reference to avoid schedule mismatches.
| Field | Ordering detail |
|---|---|
| Product | Australian Steel Rebar / AS/NZS Reinforcing Bar |
| Primary grade pages | D500N (500N) and D500E (500E) |
| Material specification | AS/NZS 4671:2019 |
| Standard reference sizes | Australian 500N N-series / New Zealand 500E nominal series |
| Bar form | Deformed straight bars; coil or decoiled options subject to size/grade |
| Bar length | Project-specified lengths, with tolerances agreed to the contract |
| Properties | Characteristic yield / ratio / Agt; chemistry / CEV; bend test as applicable |
| Inspection | Cast/lot traceability, MTC, product identification, supplementary testing when required |
| Optional processing | Cutting and scheduling; bending subject to approved drawings and availability |
| Supply basis | Diameter-by-grade and document-by-document enquiry confirmation |
Include drawing revision, grade, nominal diameter, length schedule, tonnage, destination and certificate scope.
The standard uses distinct national reference tables. Nominal kg/m is the correct starting point for estimating rebar tonnage.
| AU designation | Nominal Ø (mm) | Nominal area (mm²) | Mass (kg/m) | 12 m bar (kg) |
|---|---|---|---|---|
| N10 | 10 | 78.5 | 0.617 | 7.40 |
| N12 | 12 | 113 | 0.888 | 10.66 |
| N16 | 16 | 201 | 1.58 | 18.96 |
| N20 | 20 | 314 | 2.47 | 29.64 |
| N24 | 24 | 452 | 3.55 | 42.60 |
| N28 | 28 | 616 | 4.83 | 57.96 |
| N32 | 32 | 804 | 6.31 | 75.72 |
| N36 | 36 | 1020 | 7.99 | 95.88 |
| N40 | 40 | 1260 | 9.86 | 118.32 |
| N50 | 50 | 1960 | 15.4 | 184.80 |
| NZ reference | Nominal Ø (mm) | Nominal area (mm²) | Mass (kg/m) | Purchase note |
|---|---|---|---|---|
| Ø10 | 10 | 78.5 | 0.617 | Common 500E reference |
| Ø12 | 12 | 113 | 0.888 | Common 500E reference |
| Ø16 | 16 | 201 | 1.58 | Common 500E reference |
| Ø20 | 20 | 314 | 2.47 | Common 500E reference |
| Ø25 | 25 | 491 | 3.85 | Common 500E reference |
| Ø32 | 32 | 804 | 6.31 | Verify 500E product scope |
| Ø40 | 40 | 1260 | 9.86 | Verify 500E product scope |
| Ø50 | 50 | 1960 | 15.4 | Verify 500E product scope |
Source: AS/NZS 4671:2019, Tables 7.5(A) and 7.5(B), nominal mass calculated at 7,850 kg/m³. The New Zealand table includes sizes beyond the common product range; verify D500E producer declarations and availability for larger diameters.
Grade-specific chemical limits are distinct from mechanical properties; the carbon-equivalent calculation must match the applicable standard.
| Element / check | 500N | 500E | Basis |
|---|---|---|---|
| C, maximum | 0.22% | 0.22% | Cast analysis, standard 500 MPa class |
| P, maximum | 0.050% | 0.050% | Cast analysis |
| S, maximum | 0.050% | 0.050% | Cast analysis |
| CEV, maximum — cast | 0.44% | 0.49% | Carbon equivalent (weldability control) |
| CEV, maximum — product | 0.46% | 0.51% | Product-analysis limits |
Product analysis also has separate C, P and S ceilings (0.24%, 0.055% and 0.055%). Confirm the edition, test basis and certificates.
Project acceptance requires more than a yield-strength label. Check the manufactured bar against the relevant product and documentation requirements.
Choose the product form based on the approved bar schedule, handling conditions and manufacturer capability.
Common for construction bar schedules and cut-length orders. Check diameter, grade, standard length, bundle and transport limits.
Available only for selected grade/size combinations. Include straightening, aging, form-specific testing and processing requirements.
Submit your approved cutting list and shipping dimensions to confirm technical feasibility.
Steel grade, structural design, installation and verification are all part of an approved reinforcement specification.
Request a diameter-by-diameter offer, linked test documentation and shipping proposal.
Reliable international procurement starts with grade accuracy, verifiable test records and realistic shipment commitments.
8 million MT annual steel output across the full product portfolio, supporting industrial-scale order coordination.
1 million MT combined regular inventory across categories; verify Australian/NZ grade and size-specific availability for each enquiry.
Technical quotation aligned to steel grade, mechanical and chemical test requirements, heat records and optional third-party inspection.
Shipment documentation, packing requirements, destination and Incoterms coordinated to the actual purchase agreement.
Switch between Australian D500N and New Zealand D500E nominal-mass series before calculating the required tonnage.
Choose a steel grade/size series, bar length and number of pieces.
This tool uses the nominal bar mass values in AS/NZS 4671:2019 Table 7.5(A) for Australian 500N and Table 7.5(B) for New Zealand 500E. The selection determines which diameters and values appear.
Examples: Australian N20 × 12 m × 100 gives 2.964 MT; New Zealand D25 × 12 m × 100 gives 4.620 MT.
For larger 500E diameters, verify that the declared grade and producer documents cover the requested size. Final invoice mass may differ within applicable allowances.
Confirm actual manufacturing capability, the cast and rolling route, and grade-specific verification before promising supply.
The company-wide inventory figure is not a commitment of stock for every AS/NZS steel grade.
Build product traceability into the procurement documents before the material leaves the dispatch yard.
Align cutting and reinforcement processing with the engineering documentation and project-specific acceptance rules.
Maintain a traceable handover from the steel yard to the receiving project site.
A complete rebar schedule and compliance request helps avoid time-consuming clarifications later.
Send a complete size schedule so availability, documentation and commercial terms can be reviewed together.
These standards use different characteristic values, test methods and product sizes. Any cross-standard alternative requires project engineering approval.
Common questions on 500N/500E grade selection, size designation, nominal mass and mill documentation.
AS/NZS 4671:2019 is the Australian/New Zealand product standard for reinforcing steel in concrete. It covers bar, coil and other specified forms; this page focuses on ribbed reinforcing bars.
500N is normal-ductility Class N with characteristic Rm/Re at least 1.08 and Agt at least 5%. 500E is earthquake-ductility Class E with ratio 1.15 to 1.40 and Agt at least 10%.
No. D500N is widely used in Australian reinforcing bar schedules. D500E is associated with New Zealand seismic-class specifications and should be supplied only where the engineering documents call for it.
AS/NZS 4671:2019 gives an Australia-only nominal mass table using 24 and 28 mm references, while its New Zealand-only table includes 25 mm. Select the national bar series specified for the project.
The Australia-only AS/NZS 4671:2019 nominal reference mass for 20 mm N-series reinforcement is 2.47 kg/m. A 12 m bar is therefore estimated at 29.64 kg.
The New Zealand-only AS/NZS 4671:2019 nominal reference mass for a 25 mm reinforcing bar is 3.85 kg/m. A 12 m bar is estimated at 46.2 kg.
Both have a 500 MPa characteristic lower yield-strength requirement. Their upper characteristic yield limits and ductility requirements differ, so they are not interchangeable by strength label alone.
The standard defines chemical and weldability-related requirements. Actual welding must meet relevant engineering approvals and applicable procedures such as AS/NZS 1554.3.
Accreditation cannot be assumed. The applicable producer, mill location, grade, size and product form need to be checked against current verifiable certificates for the actual supply.
These are nominal size references and can be encountered in supplier ranges, but actual 500E grade declarations and producer compliance must be verified before quotation or order acceptance.
Common requests include heat-linked MTC, cast and product chemistry, tensile/elongation data, nominal size verification, batch identifiers and any independently verified project certificates.
Provide AS/NZS 4671 edition, specified 500N or 500E grade, diameter series, length and quantity schedule, inspection and certification conditions, destination, Incoterms and desired shipping date.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
