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BAOSTEEL METAL / CONCRETE REINFORCEMENT

HRB400 Steel Rebar

HOT-ROLLED RIBBED REINFORCING BAR · GB 1499.2-2024 · 400 MPa MINIMUM YIELD STRENGTH

GB 1499.2-2024HRB400 / Grade 400Nominal Ø6–50 mm*Mill Test Certificate
Deformed steel reinforcing barBulk project supply
BUILT FOR PROCUREMENT TEAMS

Confirm the grade, size, weight and delivery plan.

Source HRB400 hot-rolled ribbed steel rebar for concrete reinforcement projects. Share your bar diameter, cut lengths, quantity and inspection requirements. BAOSTEEL METAL will review mill capability, availability and export terms against your order.

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See Rebar Size & Weight Chart ↓
Uncoated HRB400 hot-rolled ribbed reinforcing steel bars in industrial bundles with visible transverse ribs

* Nominal diameter range is presented for standard reference; availability of each diameter and product form is confirmed per enquiry.

8 Million MTActual annual steel output across product categories
1 Million MTCombined regular steel inventory across product categories
500,000 m²Factory area
1,000+Employees supporting manufacturing operations
PRODUCT OVERVIEW

HRB400 Hot-Rolled Ribbed Steel Rebar

A reinforcement grade designed around a specified 400 MPa minimum yield strength, ribbed surface geometry and testable supply specifications.

What Is HRB400 Steel Rebar?

HRB400 is a hot-rolled, ribbed steel reinforcing bar grade under GB 1499.2-2024. The surface deformations provide mechanical interlock with concrete, while mechanical properties are verified by specified tensile, ductility and bend tests. The nominal bar diameter is the designation used for weight calculation, rather than the outermost rib-to-rib dimension.

For current projects, specify GB 1499.2-2024 explicitly. This compulsory Chinese national standard took effect on 25 September 2024 and replaced GB/T 1499.2-2018.

Order the Exact Rebar Grade

HRB400 and HRB400E share the 400 MPa minimum yield-strength grade designation, but the E grade includes additional seismic-related ductility and strength-ratio controls. Use HRB400 only where permitted by the project specification and structural design.

400 MPaMinimum lower yield strength, ReL
540 MPaMinimum tensile strength, Rm
7.5%Minimum total elongation at maximum force, Agt
Have a bar schedule or bill of quantities?

Include grade, diameter, lengths, quantities, project location and expected shipment window.

TECHNICAL PROCUREMENT

HRB400 Steel Rebar Specifications

Order-specific size, delivery, marking and testing requirements should be fixed before production or stock allocation.

SpecificationHRB400 Supply Reference
ProductHot-rolled ribbed reinforcement bar (deformed rebar)
GradeHRB400; distinguish from HRB400E / HRBF400
Main standardGB 1499.2-2024
Nominal diametersØ6–50 mm standard range; size-by-size availability on request
Supply formsStraight bars; coils only for eligible diameters and verified capability
LengthsContract-specific straight lengths; common project lengths may be requested
SurfaceAs-rolled ribbed steel surface, uncoated unless specified
InspectionChemical analysis, tensile, elongation, bend, marking, dimensional / mass checks as agreed
DocumentationHeat-traceable MTC and commercial/export documentation by contract
QuantityBulk supply and project schedules; no unsupported per-size stock promises

How to Specify Your Order

  • State HRB400 and GB 1499.2-2024 rather than simply “Grade 400.”
  • List every diameter in millimetres and its required quantity.
  • Provide straight-bar lengths or confirm whether coils are acceptable.
  • Identify third-party inspection, bending, fatigue or additional project testing.
  • Confirm shipping destination, Incoterms, marking and packing instructions.
Specified requirements must follow the project design and the applicable local construction code. An equivalence between GB and ASTM grades is not assumed.
Close-up of true crescent-shaped transverse ribs on an uncoated HRB400 steel reinforcing bar
DIMENSIONS & THEORETICAL MASS

HRB400 Rebar Size & Weight Chart

Nominal bar size is used for theoretical mass and purchasing calculations. Rib geometry means the measured external diameter is different from the nominal diameter.

Nominal Ø (mm)Nominal area (mm²)Theoretical mass (kg/m)12 m bar (kg)*Supply
Ø628.270.2222.664Verify availability
Ø850.270.3954.740Verify availability
Ø1078.540.6177.404Verify availability
Ø12113.10.88810.656Verify availability
Ø14153.91.2114.520Verify availability
Ø16201.11.5818.960Verify availability
Ø18254.52.0024.000Verify availability
Ø20314.22.4729.640Verify availability
Ø22380.12.9835.760Verify availability
Ø25490.93.8546.200Verify availability
Ø28615.84.8357.960Verify availability
Ø32804.26.3175.720Verify availability
Ø3610187.9995.880Verify availability
Ø4012579.87118.440Verify availability
Ø50196415.42185.040Verify availability

The theoretical weights follow the GB 1499.2-2024 nominal-mass series based on a reference density of 7.85 g/cm³. *12 m values are arithmetic estimates, not a stock-length commitment. Actual mass, tolerances and quantity acceptance follow the signed order and applicable standard.

Ordering multiple diameters?

Send one line per diameter, length and tonnage for a clearer factory quotation.

GB 1499.2-2024

HRB400 Mechanical Properties

Mechanical acceptance requirements for HRB400 hot-rolled ribbed steel bar under the 2024 Chinese national standard.

Mechanical propertySymbolHRB400 requirementNotes
Lower yield strengthReL≥400 MPaFor no clear yield phenomenon, use Rp0.2 as permitted by the standard.
Tensile strengthRm≥540 MPaMinimum specified ultimate strength.
Elongation after fractureA≥16%For Ø28–40 mm, 1 percentage point reduction allowed; for Ø>40 mm, 2 points allowed under the standard.
Total elongation at maximum forceAgt≥7.5%Applicable HRB400 minimum; HRB400E requires ≥9%.
Seismic strength ratiosRm0/ReL0, ReL0/ReLNot a regular HRB400 E-grade claimExtra requirements apply to HRB400E under the standard.

Values are reference standard minimums, not independent guarantees for an unidentified heat. Confirm test results and project-specific acceptance using the production lot MTC and the contractual standard edition.

400 MPa

Minimum yield designation

540 MPa

Minimum ultimate tensile strength

16%

Minimum A, subject to diameter notes

7.5%

Minimum Agt for HRB400

HEAT ANALYSIS

HRB400 Chemical Composition & Carbon Equivalent

GB 1499.2-2024 sets chemical composition and carbon-equivalent limits for the relevant grade group.

Element / measureMaximum (mass %)
Carbon (C)0.25
Silicon (Si)0.80
Manganese (Mn)1.60
Phosphorus (P)0.045
Sulfur (S)0.045
Carbon equivalent (Ceq)0.54

These are heat-analysis maxima for the HRB400 grade group. Permissible product-analysis deviations and any special purchaser limits follow the specified standard and contract.

Why Chemistry Data Matters

Heat analysis helps confirm the specified grade and can be relevant when reinforcing bars are to be welded or connected by a qualified process. Elemental limits and carbon equivalent are part of the product standard, while permissible construction welding procedures are governed by project engineering and applicable connection requirements.

The standard expresses carbon equivalent as Ceq = C + Mn/6 + (Cr + V + Mo)/5 + (Cu + Ni)/15, using percentage mass fractions.

  • Request a heat-specific chemical analysis or MTC.
  • Confirm welding and mechanical-splice requirements independently.
  • Include any additional site, inspection or engineering limits with the purchase order.
RIB GEOMETRY & TESTS

Bend Requirements, Deformations & Mill Markings

Confirm actual ribbed bar identity and batch quality using specified bend tests, rolling marks and traceable paperwork.

180° Bend Test Reference

Nominal sizeHRB400 bend mandrel D
Ø6–25 mm4d
Ø28–40 mm5d
Ø>40–50 mm6d

Here d is nominal bar diameter. The cited standard requires no cracks at the bend surface after the specified 180° test. These are laboratory test mandrels—not site fabrication bend schedules.

Bar Identity, Rib Profile & Marking

HRB400 is represented by “4” in the standard surface-grade mark; the E designation is represented differently as “4E”. The complete rolled marking also includes producer identification and nominal diameter in accordance with GB 1499.2-2024.

Close-up of actual grade and nominal-diameter rolled markings on an HRB400 ribbed reinforcing steel bar

Inspect the grade, mill identifier and diameter together with bundle tags and the MTC. Marking arrangement may vary within the governing standard.

BULK SUPPLY FORMATS

HRB400 Rebar Forms & Practical Handling

Reinforcing bar format affects unloading, bending schedules, storage, freight capacity and site preparation.

Straight 12 metre HRB400 hot-rolled ribbed steel bars assembled in parallel tied bundles

Straight Rebar

Straight bars for cut-and-bend schedules, concrete foundations, columns and other site reinforcement work. Confirm fixed lengths and diameter-specific bundles.

Factory coils of eligible small diameter hot-rolled ribbed reinforcement in a steel mill warehouse

Coils, Where Applicable

Coiled material can support continuous processing or automated straightening on eligible sizes. Coil capability, size range and handling rules must be checked by enquiry.

Detailed industrial view of true ribbed steel rebar profile and cross-sectional bar ends

Rib Profile & Bar Ends

Deformations, bar ends, nominal-mass compliance and rolled marking are among the physical characteristics checked when receiving steel reinforcement.

CONCRETE REINFORCEMENT

Common HRB400 Rebar Applications

The reinforcement grade must follow project drawings, design codes and the engineer’s specified use class.

Installed ribbed reinforcing steel grid for reinforced concrete foundation before pouring, realistic construction site conditions
01 / FOUNDATIONS

Foundations & Footings

Ribbed reinforcement in reinforced-concrete footings, foundations and base structures when specified.

02 / VERTICAL MEMBERS

Columns & Walls

Vertical and transverse reinforcement arrangements following approved concrete designs.

03 / HORIZONTAL MEMBERS

Beams & Slabs

Concrete beams and slabs with bar sizes and placement set by structural drawings.

04 / PREFABRICATION

Precast Components

Cut lengths and approved fabrication schedules for reinforcement cages and precast units.

05 / CIVIL WORKS

Infrastructure Works

Project-specific civil engineering where the approved specification permits HRB400.

06 / DISTRIBUTION

Stockholder Supply

Diameter-based bulk orders, bundle tagging and staged deliveries for distributors.

CHOOSING THE CORRECT GRADE

HRB400 vs HRB400E vs HRB500 Rebar

Compare the standardized designation first; grade substitutions require an approved structural-design review.

01 / THIS PRODUCT

HRB400 Steel Rebar

GB 1499.2-2024; minimum lower yield 400 MPa; tensile 540 MPa; minimum Agt 7.5%. Suitable where plain HRB400 is explicitly permitted.

400 MPa grade
View Grade & Specifications ↗
02 / SEISMIC GRADE

HRB400E Steel Rebar

The E grade also uses 400 MPa minimum yield but adds specified strength ratios, Agt ≥9% and reverse-bend requirements.

Additional E-grade controls
View Grade & Specifications ↗
03 / HIGHER STRENGTH

HRB500 Steel Rebar

A higher nominal minimum yield grade of 500 MPa with different tensile and bend requirements. Follow the engineered design.

500 MPa grade
View Grade & Specifications ↗
Material substitution: ASTM A615, ASTM A706 and GB 1499.2 use distinct acceptance systems. Comparable nominal yield values do not by themselves establish code equivalence.
HRB500E Steel Rebar ↗ASTM Steel Rebar ↗Rebar Category ↗
WHY BAOSTEEL METAL

Factory-Based Reinforcement Supply

Four company-wide capabilities supporting large steel purchasing programmes—not product-specific immediate stock promises.

01 / CAPACITY

Industrial Manufacturing Scale

Annual steel output of 8 million metric tons across the company’s overall product lines to support bulk sourcing.

02 / INVENTORY

Coordinated Availability

Combined regular inventory of 1 million metric tons across categories; HRB400 sizes and tonnage are checked per enquiry.

03 / QUALITY

Order-Specific Inspection

Grade identification, chemical and mechanical test requirements, traceability and certificate options are reviewed with the order.

04 / EXPORT

Project-Focused Logistics

Bar lengths, bundle weights, port handling, staged dispatches and export documentation can be planned around your shipment.

Buying for a construction project or steel distribution?

Provide a grade-by-size schedule for technical and commercial review.

PLANNING TONNAGE

HRB400 Rebar Weight Calculator

Estimate bar mass by nominal GB rebar diameter, per-bar length and number of pieces. Useful for bulk enquiries and shipment planning.

Enter Your Bar Schedule

2.964 MTEstimated total theoretical weight
29.640 kgEstimated weight per bar
100 barsNumber of pieces entered

How the Calculation Works

The tool uses the nominal mass-per-metre table in GB 1499.2-2024 rather than measuring a rib-to-rib outside diameter and applying a smooth round-bar formula.

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

Example: Ø20 mm has a nominal mass of 2.47 kg/m. For 12 m bars and 100 pieces, the theoretical total is 2.964 metric tons.

Calculated mass is an estimate for quotation planning. The actual contracted weight, accepted mass tolerance, bundle count, cutting loss and loading plan are determined separately.

View Full Size Chart ↗
HOT-ROLLED PRODUCTION

Rebar Manufacturing & Supply Coordination

Reinforcing bars are hot rolled to the required grade and rib profile, finished, inspected, bundled and prepared for shipment under the agreed purchase specification.

  • Confirm GB 1499.2-2024 and exact HRB400 grade before mill allocation.
  • Review requested diameter, shape, length, mass and bundle arrangement.
  • Identify relevant heat and test records for ordered material.
  • Coordinate dispatch and export documents according to delivery terms.
Our Manufacturing Capability ↗
Industrial hot-rolling mill line producing red-hot deformed steel reinforcement with authentic rolling equipment
Large industrial steel yard with tagged HRB400-like ribbed rebar bundles stored on supports in orderly rows
AVAILABILITY BY ENQUIRY

Check HRB400 Rebar Sizes & Lead Times

BAOSTEEL METAL holds 1 million metric tons of regular inventory across its combined steel categories. Availability of individual HRB400 diameters, cut lengths, bundles and shipment quantities is verified for each enquiry.

  • Specify each nominal diameter and the weight or number of pieces.
  • State straight-bar lengths, coil needs if applicable, and acceptable alternatives.
  • Include inspection scope, destination port and project schedule.
  • Confirm delivery terms and purchase-order certificate wording.
QUALITY VERIFICATION

HRB400 Quality Checks & Mill Test Certificates

Order-specific checks can cover grade identification, chemical composition, tensile/elongation performance, rib shape, bend test results, theoretical mass tolerance and material marking. Exact tests and documentation depend on the agreed inspection plan.

  • Heat or lot identification and certificate traceability
  • Yield, tensile and elongation values against GB 1499.2-2024
  • Bend-test conformance by nominal bar diameter
  • Nominal mass, geometry, surface marking and bundle labels
  • Additional third-party checks only when specified and arranged
For welded, mechanically spliced or fatigue-sensitive construction applications, follow the applicable design, testing and connection rules; HRB400 grade designation alone is not an engineering approval.
Steel reinforcement quality control technician measuring rib geometry and checking test records in an industrial laboratory
ORDER-BASED OPTIONS

Cut Lengths, Fabrication Schedules & Handling

Project bars may need further cutting, bending or segregation. The scope is agreed before scheduling and quotation.

01 / CUTTING

Cut-to-Length Supply

Straight bar cut lengths can be reviewed against material diameter and approved bill of quantities; commercial minimums depend on order volume.

02 / FABRICATION

Bending by Approved Schedule

Fabrication bending should follow the project’s approved bending schedules, detailing, minimum bend radii and governing site code.

03 / LOGISTICS

Marking & Sorting

Segregate reinforcement bundles by grade, diameter, heat or construction schedule line for efficient receiving and traceability.

On-site welding, re-bending and mechanical joining are governed by engineering design and applicable construction standards. Confirm process suitability and approved procedures before fabrication.
Long bundles of ribbed HRB400 steel reinforcement secured with steel ties on timber supports for export loading
PACKING & SHIPPING

Rebar Export Packing & Delivery

Loading and packaging options are set by bar diameter, length, bundle weight, destination and transport method. Ordered items are identified for receiving and certificate traceability.

  • Steel-tied bundles grouped by diameter and agreed bar length.
  • Bundle tags aligned with grade, heat and quantity documents.
  • Support and lifting provisions appropriate for long steel products.
  • Packing lists and shipping paperwork according to sale terms.
BUYER FAQ

HRB400 Steel Rebar Questions

Practical guidance for building-material distributors, civil contractors and reinforcement fabricators.

What does HRB400 mean?

HRB400 designates a hot-rolled ribbed steel reinforcing bar with a specified minimum lower yield strength of 400 MPa under GB 1499.2-2024.

Which standard currently applies to HRB400 rebar?

GB 1499.2-2024 is the current Chinese national standard for hot-rolled ribbed steel bars. It became effective on 25 September 2024 and replaced GB/T 1499.2-2018.

What is the difference between HRB400 and HRB400E?

Both have a 400 MPa minimum yield designation, but HRB400E includes extra E-grade requirements such as Agt ≥9%, specified actual strength ratios and reverse-bend testing. Use the grade required by the structural designer.

What are the typical HRB400 bar diameters?

The standard lists nominal diameters from 6 to 50 mm, with individual diameter availability confirmed by supplier. Common diameter enquiries include 10, 12, 16, 20, 25 and 32 mm.

How much does Ø20 mm HRB400 steel rebar weigh?

The nominal theoretical mass is 2.47 kg per metre. One 12-metre length is approximately 29.64 kg, and 100 such lengths have a theoretical mass of 2.964 metric tons.

Does ribbed steel have the same outer diameter as its nominal diameter?

No. Nominal diameter represents a specified equivalent cross-sectional area and mass. Transverse ribs project beyond the bar core; use the standard nominal-mass table for purchasing and weight estimates.

Can HRB400 steel rebar be welded or mechanically coupled?

Use approved welding or mechanical-connection methods and observe the project’s design and relevant connection standards. Grade identity alone does not establish connection suitability.

What documentation can be requested for a batch?

Request a heat or lot-specific mill test certificate, chemical-analysis results, tensile and elongation reports, bend-test compliance and material-identification records according to the purchase agreement.

Can I order fixed lengths and export bundles?

Ask for your target lengths, bundle format, diameter-by-diameter quantities and delivery destination. Cutting, supply form, availability and export loading are confirmed against each order.

What information should a bulk rebar RFQ include?

Send HRB400 / GB 1499.2-2024, each bar diameter, length, quantity or tonnage, inspection and MTC requirements, port or delivery address, trade terms and required schedule.

BAOSTEEL METAL / HRB400 REINFORCEMENT

Request Your HRB400 Steel Rebar Quote

Send GB 1499.2-2024, bar diameters, lengths, quantities, MTC / inspection requirements and destination. We will check order-specific supply and quotation terms.

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