Steel carbon footprint and LCA: comparing the numbers

LCA accounts for inputs and outputs within a defined life-cycle boundary. Carbon footprint is one assessment indicator; an EPD provides a verified format for declaring product environmental data. 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]

For international buyers assessing Iranian steel, connect production-route information to the actual mill, product and shipment. Compare raw-material costs, energy exposure and environmental data on consistent units and boundaries, then add the agreed settlement currency, freight and named destination. Request product-specific evidence where the customer's project requires emissions, quality or traceability reporting; an industry average or technology label cannot stand in for the offered material's verified data. Build delivery and inventory scenarios around the supplier's confirmed production plan.

Cradle-to-gate or cradle-to-grave scope, slag and scrap allocation, electricity mix and mill data change the result. Scrap percentage alone cannot establish emissions.[2][3][4]

Record functional unit, product and grade, boundary and modules, standard and PCR, primary data, electricity, allocation, recycling approach, data year and site, and verification. 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: Comparing different boundaries; Green claims without a baseline; Double-counting recycling; Industry data replacing mill data. 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.

A carbon number needs its boundary and method to be comparable. Request transparent assumptions alongside the headline value.[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.