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BAOSTEEL METAL / BRITISH STANDARD REINFORCING STEEL

BS 4449 B500C Rebar

BS 4449:2005+A3:2016 · WELDABLE RIBBED BAR · DUCTILITY CLASS C

500 MPa Characteristic Yield1.15 ≤ Rm/Re < 1.35Agt ≥ 7.5%Mill Test Documentation
Reinforcement to approved designsBatch-linked quality records
B500C / CLASS C DUCTILITY

Procure Class C reinforcement with clearly defined ductility.

Source BS 4449 B500C reinforcing bars for concrete projects specifying higher ductility class C. Compare characteristic strength, tensile-to-yield ratio, total elongation, metric nominal bar weights and the required certificate scope before ordering.

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Explore B500C Technical Properties ↓
Clean photograph of bundled ribbed steel reinforcing bars in an industrial stockyard

Nominal sizes and supply forms are standards-related information, not a confirmation of live B500C inventory. The exact size, mill, certification status and lead time are verified for each enquiry.

8 Million MTActual annual steel output across product categories
1 Million MTCombined regular inventory across product categories
500,000 m²Factory area
1,000+Employees across the company
MATERIAL OVERVIEW

What Is BS 4449 B500C Rebar?

B500C is selected for British-Standard designs specifying higher Class C ductility alongside 500 MPa characteristic yield strength.

British-Standard Class C Reinforcement

B500C is a weldable ribbed steel reinforcement grade to BS 4449:2005+A3:2016. B500A, B500B and B500C share a 500 MPa characteristic yield strength but have distinct ductility requirements. Class C adds a higher minimum tensile-to-yield ratio, an upper ratio bound and greater total elongation at maximum force.

Design and procurement: The selected ductility class must match the approved structural specification. Confirm certification and bending requirements for the actual producing mill and shipment.

Three Core B500C Acceptance Values

Specify the complete grade and standard amendment, not just “Grade 500”.

500 MPaCharacteristic yield strength
1.15–<1.35Characteristic tensile-to-yield ratio range
≥7.5%Total elongation at maximum force, Agt
Need B500C for a Class C bar schedule?

Share the approved schedule, diameter list, quantities, certification and inspection requirements.

ORDERING SPECIFICATIONS

BS 4449 B500C Rebar Specifications

State B500C to the correct British Standard edition with the required shape schedule, MTC and inspection criteria.

Procurement fieldBS 4449 B500C specification
ProductWeldable ribbed reinforcing steel for concrete reinforcement
British standardBS 4449:2005+A3:2016
Steel gradeB500C — characteristic yield 500 MPa, ductility class C
Characteristic tensile ratio1.15 ≤ Rm/Re < 1.35
Characteristic total elongationAgt ≥ 7.5%
Yield-strength upper limitAbsolute permissible maximum 650 MPa; conformity assessment follows BS 4449
Product formsStraight ribbed bars, coils and decoiled product as applicable
Example nominal sizesØ6, 8, 10, 12, 16, 20, 25, 32, 40 and 50 mm; verify ordered sizes
Length optionsAgreed commercial lengths or cut lengths; actual availability is confirmed
SurfaceHot-rolled ribbed geometry meeting the declared grade and bonding requirements
Chemical controlsHeat/product analysis limits including C, P, S, Cu, N and CEV
TestsTensile strength, strength ratio, Agt, rebend, nominal mass, rib geometry
DocumentsMill test certificate, heat/batch traceability, optional third-party certification if verified
Fabrication referenceBS 8666:2020 where project bar scheduling, cutting and bending are required
Quote basisGrade, diameter, lengths, tonnage, project documentation, destination and trade terms

What to Include in Your RFQ

  • State B500C to BS 4449:2005+A3:2016 and confirm the project acceptance basis.
  • List nominal diameter, straight or decoiled form, exact lengths and total pieces or metric tons.
  • Provide the bending schedule or BS 8666 shape codes if fabrication is required.
  • Specify MTC, heat identification, any approved supplier scheme, and third-party inspection where required.
  • Provide destination port, Incoterms, target delivery and packing restrictions.
Project approval: Procurement to an applicable material standard does not establish acceptance by every project or authority. Confirm any required CARES or other certification for the specific producer and shipment before ordering.
Close-up of longitudinal and transverse ribs on a real reinforcing steel bar
DIMENSIONS & NOMINAL MASS

B500C Rebar Size & Weight Chart

Metric diameter-to-weight references support bill-of-material checks, packing calculations and quantity-based enquiries.

Nominal diameter (mm)Nominal cross-section (mm²)Nominal mass (kg/m)12 m bar (kg)*Availability
Ø628.30.2222.664Confirm per-size supply
Ø850.30.3954.740Confirm per-size supply
Ø1078.50.6177.404Confirm per-size supply
Ø12113.10.88810.656Confirm per-size supply
Ø16201.11.57918.948Confirm per-size supply
Ø20314.22.46629.592Confirm per-size supply
Ø25490.93.85446.248Confirm per-size supply
Ø32804.26.31375.756Confirm per-size supply
Ø401,256.69.864118.368Confirm per-size supply
Ø501,963.515.413184.956Confirm per-size supply
Nominal mass: Values are rounded from the nominal bar area using 7,850 kg/m³ and published BS reinforcing-bar weight references. A 12 m mass is an arithmetic example, not a stocked length. Actual accepted mass and dimensional tolerances follow the contract and applicable BS 4449 tables.
Buying several diameters in one shipment?

Provide a size-by-size schedule so bar counts, nominal tonnage and bundle quantities can be checked.

GRADE 500 / DUCTILITY CLASS C

B500C Mechanical Properties & Class C Ductility

The Class C grade has the same characteristic yield as B500B but stricter strength-ratio and deformation-capacity requirements.

On mobile, scroll horizontally to review the complete technical table →

Mechanical propertySymbolB500C requirementTest and procurement note
Characteristic yield strengthRe500 MPaCharacteristic lower value, assessed under the specified statistical conformity procedure.
Absolute permissible yield upper limitRe650 MPaDo not interpret 500–650 MPa as a guaranteed continuous range for every individual bar.
Tensile / yield strength ratioRm / Re≥1.15 and <1.35Characteristic tensile/yield ratio with both lower and upper boundaries for Class C.
Total elongation at maximum forceAgt≥7.5%Characteristic total elongation requirement for B500C, compared with 5.0% for B500B.
Test and conformity evaluationCharacteristic / individualPer BS 4449Characteristic values and individual specimen acceptance rules are not identical; check approved edition.
Tensile testing methodTest recordsBS EN ISO 15630-1Specify inspection documents, lot/heat traceability and test-condition details in the order.
Reading the limits: Yield strength, strength ratio and elongation are characteristic standard values, subject to the relevant BS 4449 conformity scheme. Obtain actual heat/lot results and check the project acceptance basis before releasing material.
500 MPa

Characteristic yield

650 MPa

Absolute yield upper limit

≥1.15 / <1.35

Tensile / yield ratio

≥7.5%

Total elongation Agt

Request Class C testing evidence?

Specify tensile-test traceability, strength-ratio checks, Agt and required independent inspection.

WELDABILITY & CHEMISTRY

B500C Chemical Composition & Carbon Equivalent

Use the applicable cast- and product-analysis limits and carbon-equivalent formula to evaluate weldability, backed by the ordered mill test certificate.

Maximum Chemical Contents (% by Mass)

ElementCast analysis max.Product analysis max.
Carbon (C)0.22%0.24%
Phosphorus (P)0.050%0.055%
Sulphur (S)0.050%0.055%
Copper (Cu)0.80%0.85%
Nitrogen (N)0.012%0.014%
Carbon equivalent (Ceq)0.50%0.52%
The standard includes limited compositional exceptions, such as conditional carbon adjustments and allowances for nitrogen-binding elements. Use the complete contractual standard for acceptance, rather than applying this summary table alone.

Carbon Equivalent & Welding Planning

Carbon equivalent helps assess the influence of alloying elements on weldability. For B500C, the cast-analysis limit is 0.50%, while product-analysis limit is 0.52%, subject to the standard provisions.

Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
  • Request cast and product analysis as specified for the contract.
  • Confirm the weld type, joint design and fabrication plan with the project engineer.
  • Follow a qualified welding procedure and relevant requirements such as BS EN ISO 17660 where applicable.
  • Check any mandated third-party approval rather than assuming all B500C shipments have the same certificate.
RIB GEOMETRY, BENDING & IDENTIFICATION

B500C Rib Pattern, Rebend Test & Marking

Class C reinforcement has distinct alternating rib-angle identification alongside its characteristic ductility requirements.

Identifying B500C Rib Geometry

BS 4449 differentiates the three grades by the arrangement of their transverse ribs. B500C retains the opposed rib-series arrangement used for B500B, while the ribs within each series alternate between steeper and shallower inclination to the bar axis. The difference between rib angles is specified as at least 10°.

Marking verification: Grade identification by rib arrangement must be cross-checked with the producer identification, bundle tags and associated MTC. Generic site photographs do not prove a certified grade.
Close-up photograph of transverse rib profiles on deformed reinforcing steel, for grade-marking inspection

Bend and Rebend Requirements

Verify the relevant BS 4449 rebend condition, with the project-required bar diameter, test ageing/conditioning and mandrel diameter. Common manufacturer references describe a 90° bend followed by at least a 20° reverse bend; the specified mandrel differs by bar size.

  • Confirm the agreed standard edition and size-dependent bend mandrel.
  • Reconcile bend/rebend test certificates with the actual lot.
  • Use BS 8666:2020 for approved cutting and bending schedules, separately from grade acceptance.
Need verified Class C markings?

Include rib pattern, heat traceability and rebend-test records in the inspection scope.

SUPPLY FORMATS

Straight, Coiled & Decoiled B500C Steel Rebar

Material form, straightening route and length tolerance affect final acceptance and handling requirements.

Full-length bundles of ribbed steel ribbed reinforcement stored in an industrial steel yard

Straight Deformed Bars

For construction sites and stockists ordering full commercial lengths, straight ribbed bars can be quoted by diameter and bundle size.

Real industrial coils of ribbed reinforcing steel for automated handling

Coiled Reinforcement

Coils may be suitable for eligible nominal sizes and processing lines. State the grade, diameter, coil unit and processing requirements.

Straightened and cut ribbed steel reinforcing bars arranged by length for processing

Decoiled / Cut-to-Length

Where available, decoiled and cut bars can match fabrication schedules. Confirm residual strength and bend-test acceptance after processing.

Format availability is grade-, diameter-, mill- and destination-dependent. Any fabrication plan must preserve the agreed B500C mechanical performance and traceability.
Calculate Theoretical Mass ↗Check Documentation ↗
CONSTRUCTION APPLICATIONS

Where B500C Reinforcing Steel Is Used

B500C is selected by the engineer’s specification, ductility class, bending schedule and required certification—not by strength alone.

Authentic reinforced concrete site with tied ribbed steel reinforcement cages for beam and slab construction
FOUNDATIONS

Footings & Raft Slabs

Used as specified reinforcement where drawings call for B500C.

FLOOR SYSTEMS

Reinforced Concrete Slabs

Bars and shaped components for suspended and ground-supported slab reinforcement.

FRAMES

Beams & Columns

Main and supplementary reinforcement in designed concrete frames.

CIVIL WORKS

Retaining Structures

Specified reinforcing bars for walls and ground-retaining concrete.

FABRICATION

Cut & Bent Reinforcement

Bending-schedule items for approved fabricators and distribution.

DISTRIBUTION

Project & Merchant Stock

Repeat-diameter supply for qualified procurement channels.

BRITISH STANDARD GRADES

B500C vs B500B vs B500A Rebar

Each grade has characteristic yield strength of 500 MPa, but Class C specifies higher ductility than Class B and Class A.

GradeCharacteristic yieldRm/ReAgtSelection note
B500A500 MPa≥1.05≥2.5%Lower ductility class; small-diameter exceptions apply.
B500B500 MPa≥1.08≥5.0%Class B; different elongation and rib identification.
B500C500 MPa≥1.15 and <1.35≥7.5%Class C; the specified grade of this page.
Design check: A project specifying B500C must not automatically be fulfilled with B500B or other Grade 500 bars. Confirm any substitution with the responsible structural engineer and applicable contract provisions.
THIS PRODUCT

BS 4449 B500C Rebar

500 MPa characteristic yield, ratio at least 1.15 but below 1.35, and Agt at least 7.5%.

Review B500C Specs ↗
RELATED BRITISH GRADE

BS 4449 B500B Rebar

Class B uses Rm/Re ≥1.08 and Agt ≥5.0%; procurement is design-dependent.

View B500B Rebar ↗
ALTERNATIVE STANDARDS

ASTM & GB Rebar

Do not replace an approved BS grade with another national standard without a technical check.

Explore ASTM Rebar ↗
WHY BAOSTEEL METAL

Factory-Based Rebar Procurement Support

Supplier evaluation begins with the right grade and test documentation, followed by commercial and delivery terms.

01

Production at Scale

8 million metric tons of annual steel output across categories support factory-based steel supply.

02

Inventory Coordination

1 million metric tons of combined regular inventory across categories enables specification-led stock checks.

03

Material Verification

Confirm heat identification, chemical composition, tensile results, rebend and certificates for the order.

04

Export Preparation

Clarify bundle marks, packing, port routing, shipment documents and contractual delivery terms.

Factory area: 500,000 m²; workforce: 1,000+ employees. Company-scale figures describe total operations and do not imply B500C-specific inventory or immediate shipment.
THEORETICAL TONNAGE

B500C Rebar Weight Calculator

Estimate shipment tonnage using the published nominal mass per metre for each British Standard rebar diameter.

Enter Your Steel Bar Schedule

2.959 MTEstimated total theoretical weight
29.592 kgEstimated mass per bar
100 barsPieces entered

Calculation Basis

Calculate theoretical steel mass from the bar's nominal kg/m, length and number of pieces. Using nominal mass avoids treating the rib-to-rib outside diameter as a smooth round bar.

Total MT = nominal kg/m × length (m) × quantity ÷ 1,000

For Ø20 mm rebar at 2.466 kg/m, 12 m length and 100 bars, the estimated weight is 2.9592 metric tons (displayed as 2.959 MT).

This is a procurement estimate. Final billed mass may be determined by actual weighed mass, contractual tolerance and agreed basis of sale.

View Diameter Weight Table ↗
MANUFACTURING & HANDLING

B500C Rebar Production and Supply Control

Procurement checks cover steelmaking traceability, bar rolling, rib formation and the agreed material testing route.

Authentic steel rolling mill producing ribbed reinforcing bars with steel machinery and industrial lighting
ROLLING & PROCESS CONTROL

From nominated grade to traceable finished bundles.

For B500C orders, confirm which mill and process route are proposed, how the manufacturer controls product grade and dimensions, and which acceptance test records will accompany the consignment.

  • Review the ordered standard and ductility class.
  • Confirm heat and lot identification from rolling through dispatch.
  • Check tensile ratio, Agt, rebend, rib geometry and nominal mass.
  • Verify certification and inspection status against destination requirements.
AVAILABILITY BY DIAMETER

Check B500C Rebar Sizes and Lead Time

Stock and production are checked against the actual diameter-by-diameter requirement; company inventory is not specific to B500C.

ORDER-SPECIFIC AVAILABILITY

Match supply to your construction schedule.

Share a single purchase schedule with bar diameters, planned lengths, total weight, packaging units and destination. We can then assess available mill supply, suitable fabrication routes and quality document requirements for the requested material.

  • Straight or coil form and any decoiling/straightening requirements.
  • Combined shipment quantities for several diameters.
  • Target handover date, port and trade terms.
  • Certificate and project approval prerequisites.
Ribbed steel reinforcement organized by diameter and tagged bundles in an industrial warehouse
CHEMISTRY · MECHANICAL TESTING · TRACEABILITY

B500C Quality Control & Mill Test Certificates

Every project enquiry should identify the required material standard, acceptance method and documentary evidence.

What to Inspect

  • Material identity: BS 4449 B500C, producer and test lot.
  • Cast/product analysis and carbon equivalent with order-linked values.
  • Yield and tensile results, ratio, Agt and any relevant statistical acceptance record.
  • Rebend result and diameter-related mandrel setting.
  • Nominal mass, rib layout, diameter and marking.
  • Bundle/heat traceability and approved certification where explicitly requested.
An EN 10204 type 3.1 inspection certificate or other requested document format must be agreed for the order; certification by CARES or any similar body must be checked for the actual producer and product scope.

Testing & Documentation

For B500C, the buyer should verify the declared British Standard edition and actual inspection evidence. Third-party inspection and test witnessing can be scoped in the contract, rather than treated as automatically included.

Industrial quality engineer measuring ribbed steel reinforcing bar dimensions and reviewing tensile-test report, no logos
CUTTING & BAR BENDING

Optional Cut Lengths and Fabrication Scheduling

Provide the approved bending schedule when prefabricated reinforcing components are required.

01 / STRAIGHT LENGTHS

Saw or Shear Cutting

Confirm cut lengths, tolerances, end conditions and bundle marking before production.

02 / SHAPED COMPONENTS

BS 8666 Bar Schedules

Where arranged, specify project shape codes, bending dimensions and bend radii to BS 8666:2020.

03 / PROJECT CONTROL

Fabrication Quality

Agree bend-test relevance, grade traceability and packing of cut-and-bent components.

Cutting or bending services are optional and subject to the mill, contractor, selected size and confirmed fabrication capability. Structural bending and welding always follow engineer-approved procedures and relevant project requirements.
Have a BS 8666 bar bending schedule?

Send it with the relevant material grade and documentary requirements so feasibility can be checked.

BUNDLING & EXPORT DELIVERY

Packaging B500C Rebar for Shipment

Prepare bar bundles and supporting documents so diameter, grade, quantity and traceability remain clear through transport.

Neatly strapped steel reinforcing bar bundles ready for export loading with realistic plain identification tags
PACKING & DISPATCH

Simple, traceable packing for bulk steel.

Common arrangements include secured rebar bundles with batch/grade and diameter identification, together with packing records and shipping documents as agreed in the contract.

  • Confirm bundle weight and lifting constraints.
  • Align markings and mill test documents to the shipping list.
  • Specify handling or corrosion protection needs for the route.
  • Confirm FOB, CFR or CIF and agreed loading/discharge conditions.
PROCUREMENT FAQ

BS 4449 B500C Rebar Questions

Grade-specific answers for structural procurement, rebar fabrication and distributor purchasing teams.

What is BS 4449 B500C rebar?

It is weldable ribbed reinforcing steel to BS 4449:2005+A3:2016 with 500 MPa characteristic yield strength and ductility class C.

What is the latest BS 4449 standard version?

BS 4449:2005+A3:2016 is listed as current by BSI. Purchase documents should cite the actual agreed version.

What is the main difference between B500C and B500B?

B500C has characteristic Rm/Re at least 1.15 but below 1.35 and Agt at least 7.5%; B500B has Rm/Re at least 1.08 and Agt at least 5.0%. The rib identification also differs.

Does B500C have a fixed minimum tensile strength in MPa?

Its key tensile criterion is the characteristic ratio Rm/Re, evaluated together with characteristic yield and applicable conformity rules. Ask for measured paired tensile/yield results, rather than treating a multiplied nominal value as an individual-test guarantee.

What is the B500C yield strength limit?

The characteristic yield strength is 500 MPa and the standard identifies an absolute upper limit of 650 MPa. Exact acceptance must follow the contractual BS 4449 provisions.

Why does B500C have an upper strength-ratio limit?

Class C controls both the lower and upper characteristic tensile-to-yield ratio. This is part of the standard ductility classification and should be verified on the relevant test documentation.

What sizes can be quoted for B500C rebar?

Common metric nominal diameters include Ø6, 8, 10, 12, 16, 20, 25, 32, 40 and 50 mm, but the producing mill, grade and supply form must be confirmed per order.

What is the nominal weight of 20 mm B500C rebar?

Approximately 2.466 kg per metre. A 12 m straight bar weighs about 29.592 kg, so 100 such bars are about 2.9592 metric tons on a nominal basis.

How is B500C identified by its ribs?

Within each rib series, B500C has alternating higher and lower transverse-rib inclinations. Check the actual bar marking together with producer and mill records.

Can B500C be supplied in coils?

BS 4449 covers bars, coils and decoiled product. Whether a specific B500C size is supplied in coil form depends on the actual mill and process route.

Does B500C automatically have UK CARES certification?

No. Any third-party approval, CARES scope or EN 10204 certificate must be checked for the exact producer, grade, product and consignment before stating it is available.

How should buyers request a B500C quotation?

Provide BS 4449:2005+A3:2016, class B500C, diameters, straight or coil form, lengths, volume, any BS 8666 schedule, documents, destination and agreed delivery terms.

BAOSTEEL METAL / BRITISH STANDARD REBAR

Request a BS 4449 B500C Rebar Quote

Send the BS 4449 edition, B500C grade, nominal diameters, individual lengths and quantities, fabrication schedule and certification needs. We will assess the order-specific supply and delivery basis.

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