A1, A2, A3 and A4 rebar: understanding Iranian grade terminology

The commercial A1–A4 classifications refer to families with different strength, ductility and surface patterns. Structural use must be assessed against the grade and properties specified in the standard and drawings. Evaluate technical specifications, the price basis, delivery terms and quality evidence together. A lower number is not a comparable offer if it covers a different grade, weight, coating or delivery scope.[1][2]

Iranian rebar offers often use A1–A4 commercial classifications, mill marks and domestic weight conventions. Overseas buyers should map these to the full standard and grade approved for the destination project, without assuming equivalence from rib shape or strength alone. Require heat-linked certificates, bundle identity and the specified bending, splice and welding evidence. Compare the same diameters and usable quantities in the agreed settlement currency at a named port or project location, including freight, handling, cutting yield and storage protection.

Higher yield strength may reduce required steel area, but ductility, tensile-to-yield ratio, elongation, bending and weldability remain important. Manufacturing route and chemistry affect behavior after bending or welding.[2][3][4]

State grade, nominal diameter, standard, yield and tensile strength, elongation, bend and rebend tests, and weldability requirements. Compare offers only after aligning units, the weight basis, taxes, packaging, loading, freight and quote validity. An omitted cost can outweigh the apparent saving per kilogram. Keep the supplier’s currency and payment date visible before converting to your purchasing currency.

Ask every supplier to answer the same written specification. This prevents an apparently cheaper offer from silently changing the product or scope. Confirm the following before comparing prices:

Use this table to structure the decision. It does not replace engineering calculations or the contract. The final column identifies the evidence to review before accepting an offer.

Errors often begin when a trade name replaces a technical specification, one photograph stands for an entire shipment, or the delivery scope is missing from the quote. Address these specific risks: Substitution without designer approval; Identification solely by ribs; Unauthorized welding; Mechanical-property mismatch. Turn each risk into a written acceptance criterion, sampling requirement or traceable document.

A standard number alone does not demonstrate conformity. Specify the edition, grade, dimensions, tolerances, test method, heat or batch number and acceptance authority. For an import project, confirm the destination’s requirements and the project’s approved specification; an Iranian market designation is not automatic evidence of an equivalent local grade.

Grade shorthand supports discussion but cannot establish acceptance. Link design to grade, then grade to testing and shipment traceability.[4][5]

Before ordering, prepare a single comparison sheet covering the product, quantity, unit, theoretical and actual weight, base price, taxes, freight, delivery window, documents and acceptance criteria. Identify who pays each cost and who records discrepancies at receipt. This makes the negotiation clearer and gives the receiving team an agreed basis for checking the shipment.