Sino Steel supplies HRB400 and HRB500 hot-rolled ribbed reinforcing steel for concrete projects using the GB 1499.2 route. As an HRB rebar manufacturer and supplier, we confirm the full grade designation, nominal diameter, rib geometry, mass, mechanical properties, bar length, bundle identity and MTC before shipment.
HRB400 and HRB500 belong to the Chinese hot-rolled ribbed reinforcement system. The order should use the complete project-required grade identity, especially when a suffix or additional requirement is specified.
Use GB 1499.2 as the product-standard route where the project calls for Chinese hot-rolled ribbed reinforcement.
Write HRB400, HRB500 or the complete specified suffix grade. Do not shorten a project-controlled grade during quotation.
Order by the standard-defined nominal size rather than the maximum rib-to-rib outside measurement.
Confirm straight bar, coil / decoiled route where applicable, finished length and bundle requirement.
The full grade on the design document, purchase order, bundle identity and MTC should remain consistent.
The grade number identifies a different strength class within the GB reinforcing-steel route. Select the grade from the structural design or project specification rather than upgrading or substituting material only because a higher grade appears stronger.
Use where the project and structural design specify the HRB400 grade route.
Use where the project and structural design specify the HRB500 grade route.
Bar spacing, design assumptions, ductility requirements, bend details and project approvals still control whether a grade change is acceptable.
HRB rebar is a deformed bar. The transverse and longitudinal ribs sit above the bar body, so a caliper reading across the highest points is not the same thing as the nominal diameter used for ordering, reference mass and standard compliance.
Use the standard-defined nominal size as the product designation.
Measure the deformation feature using the applicable standard method rather than treating it as extra nominal diameter.
Check the repeating distance and rib pattern where dimensional inspection is required.
Where present, review it as part of the deformation geometry and rolling identity.
Nominal size, deformation geometry and mass per metre are different controls.
Reference mass per metre helps connect nominal diameter, ordered length and theoretical quantity. Actual bundle weight answers a different question and should be reconciled according to the contract or inspection plan.
Use the value and tolerance basis defined by GB 1499.2 for the selected nominal size.
Mass inspection should use a measured sample length and suitable scale, not a visual estimate from bundle size.
Reference mass × ordered bar length provides a planning figure for piece and bundle reconciliation.
Used for loading, lifting, shipping and settlement where the commercial terms require measured weight.
HRB400 and HRB500 are different grade classes, but the purchase decision is not based on yield strength alone. Tensile behavior, elongation, bend / rebend acceptance and any project-specific seismic or ductility requirement should be reviewed against the full grade designation.
| Item | HRB400 Route | HRB500 Route |
|---|---|---|
| Grade Class | 400 MPa yield-strength class | 500 MPa yield-strength class |
| Tensile Requirement | Check the grade-specific minimum under GB 1499.2 and the ordered suffix. | Check the grade-specific minimum under GB 1499.2 and the ordered suffix. |
| Elongation / Ductility | Use the test basis required for the complete grade. | Use the test basis required for the complete grade. |
| Bend / Rebend | Use the specified mandrel, angle and acceptance route. | Use the specified mandrel, angle and acceptance route. |
| Substitution | Do not replace with HRB500 without project approval. | Do not downgrade to HRB400 without project approval. |
Keep the suffix through quotation, production identity, testing, bundle tags and MTC review.
A correct rolling mark does not prove tensile performance, and an acceptable tensile report does not prove rib geometry, unit mass or finished length. Final inspection should keep each control independent.
Check the deformation pattern and dimensional route required by the standard.
Use a controlled sample length and suitable weighing method.
Review yield, tensile and elongation results against the full ordered grade.
Use the specified test route and inspect the finished bent sample for acceptance.
The rolled identification on the bar helps distinguish the product, but shipment release should also reconcile the physical bundle, bundle tag and mill documents.
Check that the physical bar carries the required product identification for the applicable GB route.
Grade, nominal size, heat / lot and bundle identity should remain linked to the actual bundle.
The mill certificate should match the material identity and test results for the delivered lot.
HRB400 and HRB500 can look very similar. Grade confirmation requires identity and documentation, not visual judgment.
Traceability should connect the steel mill or production lot, full grade designation, nominal diameter, bar length, bundle tag, mechanical results and shipment documents.
If straight bars are cut to a project length, the new bundle still needs to trace back to the original material lot and full HRB grade.
Long ribbed bars can look almost identical across adjacent sizes and grades. Factory bundling should make the ordered material easy to verify before loading.
Measure against the ordered length and the applicable dimensional tolerance.
HRB400 and HRB500 bundles should not depend on visual appearance to remain separated.
Different nominal sizes should remain in distinct bundles with matching tags.
Reconcile bundle quantity, piece count where required and shipment weight against the packing list.
Export preparation should keep bars aligned, bundle tags protected and long bundles supported without excessive sagging or one-point bending during lifting.
Use several appropriately spaced restraints along the bar length to keep the bundle stable.
Long bundles should rest on several support points instead of being supported only at the ends.
Bundle identity should remain readable through warehouse handling, loading and shipment.
Check grade, diameter, length, bundle count and documents against the actual cargo before release.
For buyers comparing reinforcement by processing route before selecting a specific national standard and grade.
View TMT Rebar →For projects using ASTM bar numbers, ASTM grades and ASTM acceptance requirements.
View ASTM A615 →For projects specifying weldable ribbed reinforcing steel under BS 4449.
View BS 4449 →For factory-welded reinforcement where bar size, spacing, sheet dimensions and weld quality define the finished mesh.
View Rebar Mesh →They are different strength classes within the GB hot-rolled ribbed reinforcement route. The project specification should determine which grade is used; a higher grade should not be substituted automatically.
Where an E-suffix grade is specified, keep it as part of the complete grade identity throughout quotation, production, testing, tags and MTC review. Do not shorten it to the base HRB grade.
No. Similar ribbed bars can look nearly identical. Use the required rolling identification, bundle tag and supporting material documents to confirm the actual grade.
Use the nominal size and dimensional inspection method required by GB 1499.2. A single caliper reading across the highest rib peaks is not automatically the nominal diameter.
Yes. Mass per metre is an important size and quantity control. It should be checked using the applicable standard method and a controlled sample rather than estimated visually.
Cut-to-length supply can be discussed where included in the order. The new finished length and rebundled material identity should then be checked and kept traceable to the source lot.
Full grade, nominal diameter, finished length or coil form, quantity and destination are enough to start. Add E suffix, test requirements, bundle weight, MTC, cut length or packing details where required.
