BAOSTEEL METAL / NEW ZEALAND EARTHQUAKE DUCTILITY

AS/NZS 4671 500E Rebar

AS/NZS 4671:2019 · GRADE D500E · SEISMIC DUCTILITY CLASS E

500–600 MPa Yield Range*A_gt ≥ 10%R_m/R_e: 1.15–1.40NZ Nominal Bar Sizes

500E / Earthquake DuctilityTraceable Inspection Records

BUYER SUPPORT FOR D500E REINFORCEMENT

Confirm seismic-class properties before placing a bulk rebar order.

Source Grade 500E deformed reinforcing bar for projects specifying earthquake-ductility steel. Review the correct New Zealand nominal sizes, characteristic tensile limits, mill test documentation and project supply requirements.

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Plain industrial photo of bundled Grade D500E ribbed reinforcing steel bars in a steel distribution yard

* Mechanical values are characteristic limits under AS/NZS 4671:2019, not unconditional single-sample guarantees. Product availability and approvals require order-specific verification.

8 Million MTAnnual output across steel categories

1 Million MTCombined regular inventory across categories

500,000 m²Company factory area

1,000+Company-wide employees

GRADE OVERVIEW

What Is AS/NZS 4671 Grade 500E Rebar?

500E identifies a 500 MPa strength grade with enhanced earthquake-ductility characteristics.

D500E Is a Seismic-Ductility Designation

AS/NZS 4671:2019 designates E as the earthquake (seismic) ductility class. For a deformed 20 mm reinforcing bar, the full designation is D500E20. This is distinct from normal-ductility 500N.

The classification regulates the characteristic yield-stress range, tensile-to-yield ratio and uniform elongation. Appropriate seismic detailing still follows the structural design standard and approved construction documents.

Purchasing note: Include the full grade and diameter in your order. Similar 500 MPa grades under other national standards should not be substituted without a structural engineer’s approval.

Four Procurement-Critical Properties

≥500Lower characteristic yield, MPa

≤600Upper characteristic yield, MPa

1.15–1.40Characteristic tensile/yield ratio bounds

≥10%Lower characteristic A_gt

These values are specified on the standard’s statistical characteristic basis. Single-test limits, batch conformity and long-term quality should be assessed according to the full standard.

Sourcing D500E to an approved construction schedule?

Send diameter, length, quantity, grade edition, producer constraints and acceptance documents together.

PURCHASING SPECIFICATIONS

D500E Steel Rebar Technical Specifications

A correct 500E purchase order needs the approved product class, New Zealand nominal size and traceability requirements.

Technical item	Procurement specification
Full product designation	AS/NZS 4671 Grade 500E deformed bar, e.g. D500E20
Steel standard	AS/NZS 4671:2019 — Steel for the reinforcement of concrete
Ductility class	E — Earthquake (seismic) ductility
Nominal New Zealand diameters	6, 8, 10, 12, 16, 20, 25, 32, 40, 50 mm in Table 7.5(B); confirm grade availability
Commonly purchased D500E bar sizes	12, 16, 20, 25, 32 and 40 mm; not a statement of BAOSTEEL stock
Nominal profile	Deformed ribbed reinforcing bars; confirm manufacturer markings and rib geometry
Standard characteristic yield	R_ek.L ≥500 MPa; R_ek.U ≤600 MPa
Characteristic tensile/yield ratio	(R_m/R_e)_k.L ≥1.15 and (R_m/R_e)_k.U ≤1.40
Characteristic uniform elongation	A_gt,k.L ≥10.0%
Supply form	Straight bars, applicable coils or decoiled bars; specify and verify properties after processing
Lengths	To approved bar schedule; production and length tolerance agreed at order
Composition	Cast/product chemistry, including C, P, S and carbon-equivalent value
Inspection	Tension, bend/rebend by diameter, mass tolerance, bar identity, product conformity
Documents	Manufacturer/lot records, inspection results, project conformity or approval documents
Welded connections	Engineering approval and AS/NZS 1554.3 where applicable
RFQ essentials	D500E + size + length + total kg/MT + certification requirements + destination

What to Send for a D500E Quotation

Approved drawing/specification identifying AS/NZS 4671:2019 Grade D500E.
Size-by-size schedule, with D500E25 rather than an Australian D500N24 where 25 mm is required.
Straight/coil/cut form, length, number of bars and total nominal tonnage.
Approved mill list, certificate/independent testing requirements and bundle marking specifications.
Destination, delivery terms, handling restrictions and intended bending or welding.

Mill approvals and product certifications must be confirmed for the named producer and actual lots; no third-party certification is implied by company-level capacity figures.

Close-up photograph of real longitudinal and transverse ribs on Grade 500E reinforcing steel

NEW ZEALAND SIZE TABLE

D500E Rebar Sizes and Nominal Weight Chart

Use the New Zealand diameter series for Grade 500E rather than the Australian Grade 500N mass schedule.

NZ grade/diameter	Nominal area (mm²)	Mass (kg/m)	12 m bar (kg)	Supply confirmation
D500E6 / Ø6	28.3	0.222	2.664	Size-dependent; confirm mill
D500E8 / Ø8	50.3	0.395	4.740	Size-dependent; confirm mill
D500E10 / Ø10	78.5	0.617	7.404	Size-dependent; confirm mill
D500E12 / Ø12	113	0.888	10.656	Size-dependent; confirm mill
D500E16 / Ø16	201	1.58	18.960	Size-dependent; confirm mill
D500E20 / Ø20	314	2.47	29.640	Size-dependent; confirm mill
D500E25 / Ø25	491	3.85	46.200	Size-dependent; confirm mill
D500E32 / Ø32	804	6.31	75.720	Size-dependent; confirm mill
D500E40 / Ø40	1260	9.86	118.320	Size-dependent; confirm mill
D500E50 / Ø50	1960	15.4	184.800	Size-dependent; confirm mill

Technical reference: AS/NZS 4671:2019 Table 7.5(B), New Zealand nominal diameters and masses. All numbers are theoretical, based on 7,850 kg/m³; the specified mass tolerance is ±4.5%. Diameter tables identify a standards reference, not grade-by-size inventory. Larger sizes, 6/8 mm forms and long-length supply require specific mill confirmation. Other sizes require certified area/mass documentation.

Need material quantities for a bar-bending schedule?

Share the D500E diameter and cut-length schedule for a shipment-specific quotation.

MECHANICAL PERFORMANCE

500E Seismic Ductility and Mechanical Properties

The earthquake class requires both elevated uniform elongation and controlled upper/lower characteristic strength limits.

Characteristic property	500E requirement	How it is specified
Lower characteristic yield R_ek.L	≥ 500 MPa	Lower characteristic, P=0.95
Upper characteristic yield R_ek.U	≤ 600 MPa	Upper characteristic, P=0.05
Lower characteristic ratio (R_m/R_e)_k.L	≥ 1.15	Lower characteristic, P=0.90
Upper characteristic ratio (R_m/R_e)_k.U	≤ 1.40	Upper characteristic, P=0.10
Lower characteristic uniform elongation A_gt,k.L	≥ 10.0%	Lower characteristic, P=0.90
Test specimen condition	As produced / aged as specified	AS/NZS 4671:2019 Table 7.3

Do not infer a fixed tensile MPa value: Rm/Re is controlled as a characteristic ratio relative to measured yield; conformity uses the standard’s product testing and statistical acceptance provisions. These figures are not universal single-specimen thresholds.

What Should the MTC / Test Evidence Show?

Correct D500E grade, size, producer and lot reference.
Measured yield stress and maximum tensile strength using nominal area.
The measured R_m/R_e ratio, A_gt and test specimen condition.
Applicable batch conformity and producer long-term quality records.
Referenced edition, test method and any design-specific third-party requirements.

Where there is no clear yield phenomenon, the standard uses a 0.5% proof stress definition for the E ductility class. Refer to the specific material report.

CHEMICAL COMPOSITION

Grade 500E Chemistry and Carbon-Equivalent Limits

The 500E carbon-equivalent limits differ from those of 500N; do not reuse the normal-ductility chemistry table.

Element or parameter	Cast analysis maximum	Product analysis maximum
Carbon (C)	≤0.22%	≤0.24%
Phosphorus (P)	≤0.050%	≤0.055%
Sulfur (S)	≤0.050%	≤0.055%
500E Carbon equivalent (CEV)	≤0.49%	≤0.51%

Source: AS/NZS 4671:2019 Table 7.1(A). Chemical limits are maximum mass percentages. Cast and product analyses have separate thresholds; CEV is calculated from the relevant alloying elements.

Verify Welding Conditions

Conformity to AS/NZS 4671 includes a weldability basis, but it does not replace a project-specific welding procedure. Review the material chemistry, connection type and site requirements against AS/NZS 1554.3 when applicable.

Document each mill heat and the applicable carbon-equivalent result.
Specify any welding, mechanical couplers, bent details or prefabricated cages in advance.
Use engineer-approved weld details, operator qualifications and inspection scope.
Keep D500E-specific tests after straightening, bending or other specified processing.

BEND AND REBEND TESTS

500E Reinforcing Bar Bend-Test Requirements

Laboratory acceptance tests are separate from allowable bend radii in approved fabrication drawings.

Material Conformity Test Overview

Diameter	Class E mandrel	Test arrangement	Acceptance basis
d ≤ 16 mm	4d	90° bend, followed by reverse-bend procedure	Rebend to the standard’s required angle after ageing/cooling
d > 16 mm	4d	180° bend	Standard bend test; no corresponding rebend angle

Reference: AS/NZS 4671:2019 Clause 7.2.3 and Table 7.4, for deformed bars other than mesh. A laboratory test mandrel is not automatically the allowable fabrication or site re-bending radius.

Cutting, Bending and Installation

500E reinforcement is often purchased to an engineer’s bar-bending schedule. Bar spacing, anchorage, couplers, bending radii and welding must follow the applicable concrete design/construction standards and approved fabrication instructions.

Steel mill quality laboratory bending a ribbed reinforcing bar around a mechanical test mandrel

Photograph area for actual bending test equipment; photo text belongs outside the image.

GRADE IDENTIFICATION

Grade D500E Rib Profile, Markings and Traceability

Verify steel grade and producing mill through the required identification system and attached records.

01 / BAR ID

D500E Designation

The D identifies a deformed bar, 500 the nominal strength grade, and E the seismic ductility class. Include nominal diameter in the purchase code.

02 / RIB GEOMETRY

Surface Identification

Inspect rib patterns and producer marks against AS/NZS 4671:2019 Clause 10, using the actual manufacturer identification scheme.

03 / TEST TRACE

Batch Documentation

Match bundle labels, mill/lot identifiers, testing certificates and agreed traceability records to the receiving list.

An illustrative rib image alone cannot establish the steel grade, manufacturing route, independent certification or project approval. Verify the actual lot documentation.

PRODUCT DELIVERY FORMS

Grade 500E Straight Bars, Coils and Cut Lengths

The requested processing route and diameter affect the available supply form and required post-processing verification.

Straight full-length Grade D500E deformed reinforcing bars secured into steel bundles

Deformed Straight Bars

Regular straight bundles or cut-to-project bar lengths. Diameter, end treatment and lot identification are confirmed with the quotation.

Real industrial reinforcing steel coil stacks with visible steel ribs

Approved Coil / Decoiled Bar

Coil formats apply only to appropriate diameters and producer processes. Verify test conditions after straightening or decoiling.

Squarely sawn cut ribbed steel reinforcing bars showing clean authentic end faces

Cut and Scheduled Lengths

Cutting and bending can be discussed against a documented bar schedule and approved fabrication rules, subject to capacity.

Have a D500E cutting schedule?

Attach the bar mark, nominal diameter, length, quantity and required destination for each line.

ENGINEERING USE CASES

Where Is 500E Seismic Reinforcing Steel Used?

Select the reinforcement grade by the project design specification, not by a generic claim that the steel is earthquake-proof.

Real reinforcement cage and bar tying at a structural concrete construction site in New Zealand or similar seismic project

Seismic Concrete Frames

Reinforcement for ductile beams and columns when the approved drawings specify E-class bar.

Shear Walls and Cores

Wall and core reinforcing cages within the engineer’s seismic detailing requirements.

Beam-Column Joints

Grade and detailing-controlled reinforcement at critical beam-column connections.

Seismic Foundations

Base mats and foundation reinforcement for specified earthquake-resistant structures.

Precast Structural Elements

Controlled Grade 500E reinforcement for traceable precast members.

Infrastructure and Retaining

Bridge or earth-retaining elements where the governing design calls for this grade.

A material grade by itself does not determine the earthquake resistance of a building. Connection detailing, design, installation, inspection and the full building system govern structural performance.

GRADE COMPARISON

500E vs 500N vs 300E: Choose the Correct Ductility Class

Both 500E and 500N specify a lower characteristic yield of 500 MPa, but their upper yield bounds and ductility requirements differ.

Grade / ductility	Characteristic yield range	Characteristic Rm/Re	Minimum characteristic Agt	Selection note
500E / Class E	500–600 MPa	1.15–1.40	≥10%	Earthquake ductility; NZ reference
500N / Class N	500–650 MPa	≥1.08	≥5%	Normal ductility; Australia
300E / Class E	300–380 MPa	1.15–1.50	≥15% for deformed	Earthquake ductility, lower yield grade
500L / Class L	500–750 MPa	≥1.03	≥1.5%	Low ductility; different product usage

Specification warning: Values follow AS/NZS 4671:2019 Table 7.2(A). Use the complete acceptance criteria and approved structural design. The grade code alone does not authorize interchange with HRB500E, ASTM A706 or BS 4449 grades.

GRADE E / SEISMIC

500E — Your Current Grade

Earthquake-ductility steel with controlled upper yield stress, tensile ratio and Agt.

GRADE N / NORMAL

500N — Australian Grade

Normal-ductility reinforcement with separate limits and a different common Australian size series.

View product details →

GRADE E / LOWER YIELD

300E — Other Seismic Grade

Different characteristic strength class and minimum ductility; subject to engineer specification.

WHY BAOSTEEL METAL

A Practical Partner for Seismic Rebar Purchasing

Factory-wide scale is useful in procurement; actual 500E product, mill and project compliance remain order-specific.

01 / SCALE

Manufacturing Footprint

Large company-wide steel production and integrated operations support industrial procurement discussions.

02 / STOCK

Inventory Coordination

Combined regular inventory across multiple steel categories helps plan requested material schedules; lot stock must be verified.

03 / QC

Test Documents

Coordinate grade identification, chemical/mechanical test evidence, dimensional checks and traceable bundle markings.

04 / EXPORT

Order Execution

Discuss delivery forms, bundle packing, destination requirements and shipment documents with one point of contact.

BAR WEIGHT TOOL

AS/NZS 4671 500E Rebar Weight Calculator

Calculate nominal tonnage from the New Zealand 500E standard mass schedule, straight-bar length and quantity.

Estimate Rebar Weight

NZ D500E bar diameterNominal mass (kg/m)Length of each bar (m)Number of bars (pieces)

Nominal order weight2.964 MT

29.640 kgNominal weight per bar

100 barsEntered pieces

Formula: nominal kg/m × metres × pieces ÷ 1,000 = metric tonnes. Values are estimates for planning; certified/actual mass and order tolerances may differ.

Example: D500E25

3.85Nominal kg per metre

46.20Nominal kg per 12 m bar

4.620MT for 100 bars at 12 m

Uses NZ Table 7.5(B) nominal mass data, including Ø25 mm.
The standards mass-tolerance reference is ±4.5%.
Price and shipped tonnage are based on the confirmed size schedule and shipment documents.

MILL PRODUCTION & CONFORMITY

Production Routes and Testing for 500E Reinforcement

Production method and downstream processing must preserve the declared seismic grade.

Real steel reinforcement rolling line with authentic ribbed bars travelling through industrial mill rollers

PRODUCTION & TESTING

Identify the route behind the bar.

500E products can be manufactured by routes such as micro-alloying or appropriate in-line thermal processing. Performance requirements and test records, rather than a generic manufacturing-process label, establish the accepted product designation.

Verify the approved producing mill and grade route.
Check applicable tensile, rebend, mass and geometry tests.
Confirm product conformity and any approved third-party evaluation.
Maintain grade and heat/lot traceability through processing.

INVENTORY & LEAD-TIME PLANNING

Confirm D500E Availability by Diameter and Delivery Form

Company-wide inventory numbers are not a claim that all 500E diameters are on the shelf.

ORDER-SPECIFIC STOCK CHECK

Build a realistic order from the size schedule.

Availability, minimum order quantity, production planning, stock-lot documents and delivery window vary by grade, mill and diameter. Submit the approved bar schedule for a documented supply assessment.

Separate straight-bar and coil requirements.
Group sizes and lengths by the required delivery lots.
List the mill/third-party approval scope before quoting.
Confirm destination discharge and any overlength transport constraints.

Stacked bundles of ribbed steel reinforcing bars in an industrial inventory yard by diameter

QUALITY ASSURANCE

500E Rebar Quality Inspection and Mill Traceability

Test records for the actual lot are essential when the project specifies E-class reinforcement.

Steel materials quality inspector checking rebar dimensions and a laboratory test report on a workbench

INSPECTION & ACCEPTANCE

Check the values that matter.

Inspection discussions should address chemistry, R_e, R_m, tensile/yield ratios, A_gt, mass tolerance, bend/rebend performance and bar identification.

Specify certificate type and required standard edition.
Tie mill results to producer, diameter, heat/lot and shipment tags.
Review statistical conformity and required independent checks.
Verify test condition after processing from coils into straight bars.

OPTIONAL PROCESSING

Cutting and Bar-Schedule Services for D500E

Confirm available processing against the approved fabrication and seismic detailing requirements.

01 / CUT TO LENGTH

Cut Lengths

Sawing or mechanical cutting to agreed lengths and batch tags, subject to quotation.

02 / BENDING

Bar Schedule Coordination

Review approved diameter, bend-angle and bend-radius schedules before discussing production.

03 / COUPLERS & WELDS

Engineering Review

Couplers, threading or welding follow project-approved specifications and are separately confirmed.

Optional services are capability enquiries, not a promise of immediate processing for every 500E size. Site rebending is governed by project design and construction requirements.

Do you need prefabrication?

Attach your schedule and the engineer-approved fabrication notes to the product enquiry.

EXPORT PACKAGING & LOGISTICS

How D500E Rebar Orders Are Packed and Shipped

Keep each shipment easy to count, trace, handle and verify at destination.

Industrial export shipment of bundled and strapped steel rebar with plain identification tags, no logos

PREPARED FOR INDUSTRIAL DISPATCH

Clear bundles and paperwork.

Discuss strapping, straight-bar bundle dimensions, protective handling, grade/lot tags and agreed packing documentation. Shipment design should match the truck, container or breakbulk transport plan.

Confirm total gross and nominal/net masses.
Maintain D500E grade, heat/lot and size labels.
Include agreed packing lists, test records and shipping documents.
Confirm destination requirements before dispatch.

ENGINEERING PROCUREMENT FAQ

Grade 500E Rebar Frequently Asked Questions

Straight answers on earthquake ductility, grades, mill certificates, sizing and contract requirements.

What does Grade 500E mean?

500 refers to the lower characteristic yield stress of 500 MPa, and E denotes earthquake (seismic) ductility under AS/NZS 4671:2019. D500E20 identifies a deformed 20 mm bar.

Is AS/NZS 4671:2019 the edition used here?

Yes. The page references AS/NZS 4671:2019. Confirm the governing contract edition, amendments and project approval requirements at ordering.

Is 500E stronger than 500N?

Both have a 500 MPa lower characteristic yield. 500E has a tighter upper characteristic yield of 600 MPa, a tensile/yield ratio between 1.15 and 1.40 and Agt at least 10%; 500N has different normal-ductility limits.

What is the Grade 500E Agt requirement?

The lower characteristic uniform elongation at maximum force is at least 10.0%, assessed in accordance with the standard’s specified test and conformity procedures.

What is the nominal D500E25 weight?

AS/NZS 4671:2019 New Zealand Table 7.5(B) lists 3.85 kg/m for nominal 25 mm bar. A 12 m bar is 46.20 kg and 100 such bars total approximately 4.620 metric tonnes.

Which bar diameters appear in the New Zealand weight table?

The nominal New Zealand reference table includes 6, 8, 10, 12, 16, 20, 25, 32, 40 and 50 mm. A published table does not mean every diameter is currently offered in Grade 500E.

Can Australian N24 be substituted for D500E25?

Not automatically. Australian 500N and New Zealand 500E are different grades with different common nominal diameters and properties. Obtain engineering approval of any proposed substitution.

What chemistry limits apply to Grade 500E?

The 2019 table specifies cast analysis maxima of C 0.22%, P/S 0.050%, CEV 0.49%; product analysis maxima of C 0.24%, P/S 0.055%, CEV 0.51%.

Can Grade 500E rebar be welded?

Welding is subject to the approved joint design, relevant AS/NZS 1554.3 requirements, the producing mill’s chemistry and the project welding procedures.

What bend and rebend tests apply?

For deformed E-class bars up to 16 mm, the standard uses a 4d mandrel with 90° bend and the specified rebend process. For sizes above 16 mm, a 4d mandrel and 180° bend are specified for the material test. Site bends are a separate design matter.

Does compliance mean a building will be earthquake-proof?

No. 500E is a material ductility classification. Seismic resistance depends on the full structural design, detailing, construction and inspection.

What information do you need to quote D500E?

Provide the edition, grade D500E, required diameters, straight/coil form, lengths, total quantity, producer approvals, certificates, destination and requested delivery terms.

BAOSTEEL METAL / D500E REINFORCEMENT

Request an AS/NZS 4671 500E Rebar Quote

Send the D500E diameter schedule, quantities, lengths, the AS/NZS 4671 edition, required manufacturer approvals and certification scope. We can then confirm the matching supply route, documentation and shipment options.

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