Aluminum casting traceability should let a buyer start with a delivered part or labelled container and find the relevant material, processing and inspection records. A folder of certificates is useful only when those records can be matched to the supplied parts. Agree on that connection before placing the production order.
Part number, heat number and production lot: define each identifier
A part number identifies a design; it does not identify which production run made a particular casting. GS1 distinguishes identification at product, batch/lot and individual serial-number levels. Its traceability framework also calls for recording the relationship between manufacturing inputs and outputs. These are useful principles when planning a casting record chain. [1]
In the RFQ, ask the foundry to define its identifiers. What does its heat number represent: an incoming metal supplier's heat, a foundry melt or another controlled grouping? How is a casting lot defined? Which identifier follows the parts after heat treatment and machining? Do not assume that different suppliers use these terms in the same way.
Separate the melt identifier from the heat-treatment batch identifier. Two groups can share a melt reference while following different later processing routes. Your records should make that distinction visible.
Choose lot-level or individual-part traceability
Start with the question the record system must answer. Do you need to identify a production lot, distinguish individual tested parts, or connect several lots to one delivered container? Specify the required level at the part, inner-pack and shipment levels.
For lot-controlled castings, agree on how identity survives transfers between containers and operations. For individually identified parts, agree on the marking content, position, method and when it is applied. Review whether machining or finishing could remove or obscure it. A readable label on an outer carton does not explain how loose parts will be identified after unpacking.
Ask for a sample label and a sample record link before production approval. Treat a QR code or barcode as a way to retrieve information; also check what the identifier resolves to and whether your receiving team can use it.
Build a record chain around the agreed manufacturing route
Use the following as a proposed review checklist, then tailor it to the drawing, order and inspection plan. Each applicable record needs an identifier that connects it to the relevant parts or lot.
Material and melt: identify the alloy requirement, incoming material documentation, foundry melt reference and applicable chemistry result. Clarify whether a certificate describes supplied ingot or the material checked during the foundry's own process.
Casting: record the production lot and its connection to the melt. Where required for the program, include the tooling or cavity reference and production date.
Heat treatment: connect the casting lot or selected quantity to the treatment batch and the agreed evidence for the delivered temper. A melt chemistry result alone does not establish the final heat-treatment condition.
Machining: identify the input casting lot, the machining job or batch, and the controlled drawing revision used for the delivered features.
Inspection and disposition: link each required report to its part or lot, manufacturing state and acceptance requirement. Identify sampled pieces where results come from sampling. Keep any approved concession identifiable.
Packing and shipment: connect the released quantities and lot identifiers to the packing list and container labels. Confirm how quantities split across shipments will be recorded.
Example: one casting lot splits into two heat-treatment batches
Consider an illustrative order for 120 A356 pump housings. This is a planning example, not a Bohua customer case or production record. Assume all 120 castings belong to lot C-101 with melt reference H-101. Eighty enter treatment batch T-A and forty enter T-B.
After machining and the agreed inspection, the eighty T-A parts are packed into containers P-01 and P-02, forty per container. The forty T-B parts go into P-03. The record chain retains C-101 and H-101 for all three containers, while distinguishing the treatment batches and their inspection records.
If a concern arises about T-B, the records identify P-03 as the container to investigate against that treatment history. If the concern instead relates to H-101, all three containers share the melt reference. Actual containment decisions still depend on the nature of the issue and the investigation.
A packing list showing only C-101 would lose the treatment-batch distinction. If lots are mixed within one container, require a clear quantity breakdown and an agreed way to distinguish the contents when the container is opened.
Check whether an inspection report covers the received parts
At receiving inspection, compare the packing label and report identifiers before evaluating the measurements. Check the part number, revision, lot or serial references, delivered condition, report date and inspection scope. Ask for an explanation when references differ rather than accepting a similar filename as a match.
For a CMM report, confirm which part was measured and whether it represents a defined sample. For a pressure-tightness record, check the agreed test state, method and acceptance criteria as well as the identification. A report for a first sample should not be treated as evidence that every later shipment received the same inspection.
Keep traceability and acceptance as separate questions. A perfectly linked record can contain a failing result. A passing result with no reliable connection to the delivered lot cannot establish that lot's acceptance.
Include rework, replacement labels and changed revisions
Ask the supplier to show how the record chain handles exceptions. If only part of a batch is reworked, the record should distinguish that quantity and connect the rework authorization, operation and required reinspection to it. Repackaging should preserve the connection between the old and new container references.
For a lost or unreadable label, agree on who can authorize re-identification and what evidence is needed. Do not reconstruct identity merely because parts look alike. For a drawing change, distinguish the revision quoted, the revision authorized for production and the revision delivered.
Also agree on record retention, retrieval responsibility and access to confidential information. Set these terms for the specific program; a general claim of traceability does not establish a universal retention period or response time.
Run a practical supplier trace check before repeat orders
AIAG's published introduction to its Traceability Guideline describes self-assessment and traceability exercise forms. A useful buyer-side application is to test a representative record chain, rather than review only a blank form. [2]
Select a sample part or container reference from a trial shipment. Ask the supplier to retrieve the applicable material and processing references, required inspection reports and release record. Then reverse the question: starting with a selected melt or treatment batch, which delivered containers and quantities are connected to it?
Record missing links, ambiguous identifiers, quantity differences and the time taken to retrieve the evidence. Agree on corrections and repeat the exercise where necessary. This checks the agreed workflow; it is not, by itself, a certification audit or proof that every production record is complete.
What to include in an aluminum casting traceability RFQ
Give the supplier a concise record-scope brief with the drawing and annual volume:
Identification: required lot or serial level, identifier definitions, marking location and sample packing-label format.
Process coverage: casting, heat treatment, machining, finishing and any other operation whose records must remain linked.
Evidence: required material documentation and inspection reports, sampling scope, record language and delivery format.
Exceptions: rules for lot splits, mixed containers, partial shipments, rework, revised drawings and replacement labels.
Retrieval: record-retention terms, responsible contact and an agreed trace-check procedure.
Ask the quotation to identify the included scope and any additional marking, record preparation or inspection cost. This gives the buyer a clearer comparison than asking for full traceability without defining what must be supplied.
Review the traceability scope with Bohua Casting
Bohua's public quality-control information identifies heat/serial traceability and project-defined inspection records. Confirmed capabilities include Oxford OES material analysis, CMM inspection and an in-house pressure-tightness testing workshop. Bohua also supports casting, CNC machining and suitable T5/T6 heat-treatment programs. The applicable route and evidence package need to be agreed for the component. [3, 4]
For a sourcing review, provide the controlled drawing, alloy and temper, delivered condition, annual quantity and the record-scope brief above. Include your sample label or reporting template if receiving inspection depends on a particular format.
Use the Start RFQ button below to request a casting and documentation review. State which records must accompany the shipment and which must be retrievable on request, then follow the enquiry page's instructions for sharing drawings.
Sources and scope
[1] GS1 — Global Traceability Standard, Release 2.0. Used for the distinction between product, lot and serial identification and the principle of linking manufacturing inputs and outputs. Official source: ref.gs1.org/standards/global-traceability/2.0.0/.
[2] AIAG — AIAG's New Traceability Guideline Now in Stock!, 17 January 2019. Used for the guideline's description of self-assessment and traceability exercises. Publisher: blog.aiag.org.
[3] Bohua Casting — Quality Control & Inspection. Public capability page: www.bohua-casting.com/quality-control.
[4] Bohua Casting — Casting Capabilities and confirmed company capability records. Public page: www.bohua-casting.com/capabilities.
Sources reviewed on 22 September 2026. The record checklist and 120-part example are practical planning suggestions; project and customer requirements determine the agreed controls.
FAQ
Is a heat number enough for aluminum casting traceability?
It identifies only the grouping defined by the supplier's numbering system. Ask how that reference connects to casting lots, later treatment and machining batches, required inspection records and delivered containers. One melt reference may cover parts with different subsequent processing histories.
Does every aluminum casting need an individual serial number?
Select the identification level from the drawing, customer requirements and intended use of the records. A lot-level system and an individual-part system answer different questions. Agree on the required level and how identity is maintained through processing and unpacking.
Does a material certificate prove that an A356 casting is in T6 condition?
Review what the certificate actually covers. A chemistry result alone does not establish the delivered temper. Agree on the required heat-treatment and verification evidence, and check its connection to the supplied parts or batch.
What should a buyer check when receiving a batch of castings?
Match the packing labels and quantities to the order, part number, revision and lot or serial references. Then verify that the required inspection and release records cover those parts in the delivered condition, including any authorized exceptions.