For steel products covered by Section 232 reporting, the entry summary asks for the country of melt and pour: where the steel was originally melted and poured into its first solid shape. For aluminum, the filing asks for the countries of smelt and cast, and aluminum filers report both a primary and a secondary country of smelt under the current guidance. Neither field is the country of origin in the ordinary marking sense, and neither can be inferred from where the finished part was machined. A bracket cut and drilled in Vietnam from Chinese melted steel carries Vietnam as its manufacturing origin and China on the melt and pour line, and that second line is the one the tariff treatment reads. Importers who let a supplier leave the field blank, or who copy the origin line into it, are filing a guess into a field CBP treats as a declaration.
Why a second origin exists at all
The melt and pour rule exists because finishing work is mobile and melting capacity is not. A mill melts steel in one place; rolling, coating, and fabrication can happen anywhere, and before content reporting, routing semi finished steel through a third country could launder its tariff identity. Tying the report to the melt closes that route. The same logic drives aluminum smelt and cast reporting, with the added wrinkle that secondary smelt matters because recycled content moves through the supply chain in volume and Commerce wanted visibility into it.
The practical consequence lands on purchasing, not on the broker. The broker can only file what the mill certificate says. If the purchase order never required a mill test certificate showing melt country, the entry team discovers the gap at filing time, with the goods already arrived. Put the certificate requirement in the purchase terms, in writing, naming the field it has to support.
Related reading on this site: LandedWatch and LandedWatch cover the neighbouring problems in more depth.
Unknown is a procedure, not a shrug
CBP guidance for Section 232 derivative products has dealt explicitly with steel content that genuinely cannot be determined at filing, including defined reporting for unknown content in specified situations. That procedure is narrow. It covers content the importer cannot establish with reasonable care, it is not a default for suppliers who did not answer an email, and repeated unknown reporting on the same product line reads as a sourcing control problem, because after the third shipment the importer knows exactly which question the supplier keeps not answering.
Reasonable care, the standard in 19 USC 1484, is the frame for the whole field. Document the ask: the certificate request, the supplier reply, the mill documents on file. An importer who can show the file gets a very different hearing from an importer whose entire evidence is that the field looked optional.
Build the data into receiving
The durable fix is unglamorous. Add melt and pour, and smelt and cast, to the item master for every covered SKU, sourced from mill certificates at first receipt, and lock the fields so a new purchase order cannot silently change them. When a supplier changes mills, and suppliers do, the certificate on the next shipment is the trigger to update the record before the entry is filed, not after a correction is needed.
Corrections exist, a post summary correction before liquidation can fix a wrong content line, but a correction pattern across dozens of entries is how a reporting sloppiness issue becomes a penalty conversation. Get the first entry right, then defend the record that made it right.
Frequently asked questions
What is country of melt and pour for steel?
It is the country where the steel was originally melted and poured into its first solid form, reported on covered steel entries in addition to the ordinary country of origin. It follows the mill, not the country where the finished article was fabricated.
What do aluminum entries report instead?
Covered aluminum entries report country of smelt and cast. Under current guidance filers report primary and secondary countries of smelt as well as the country of cast, which gives visibility into both primary and recycled aluminum streams.
Can an importer report steel content as unknown?
Only within the narrow procedure CBP has defined for content that cannot be determined despite reasonable care. It is not a routine substitute for supplier documentation, and repeated use on the same product invites scrutiny of the importer's sourcing controls.
What document proves melt and pour country?
The mill test certificate or mill certificate issued for the heat of steel used in the shipment is the standard evidence. Importers should require it in purchase terms and keep it with the entry file for each shipment.