How does product traceability work in a steel plant?
Steel traceability ties every coil, plate, bar or bundle back to the heat it was made from, using an ID that is marked on the product at each stage and recorded in the plant systems at every move. When a customer reports a defect, the plant can pull the heat, its process and test data, and every other product made from the same heat.
Talk to an engineer about thisThe chain of identities from heat to customer
Traceability in steel is a chain of IDs, each linked to its parent. The heat number is created in the melt shop. Casting turns the heat into slabs, blooms or billets, each with its own ID that carries the heat reference. Rolling turns those into coils, plates, bars or wire rod with new IDs; slitting, cutting and bundling create more. At dispatch, the pack or bundle ID links to the order, the vehicle and the test certificate. Mill test certificates, often requested in the EN 10204 type 3.1 format, quote the heat number and the chemical and mechanical results for it.
If any link in that chain is missing, traceability stops at that point. The whole design goal is that no product changes shape, location or owner without its new ID being tied to the old one.
What traceability markings are used in steel manufacturing
The marking has to survive the process that follows it, so the method changes along the route. Hot products such as billets and slabs are usually die stamped or marked with heat resistant paint, often by automated marking machines. Plates and sections are commonly paint or ink marked with the heat and product ID. Cold finished products take ink jet or laser marking. Coils, bundles and wire rod usually carry tags: heat resistant metal tags, printed barcode or QR labels, and in some yards RFID tags that can be read without line of sight.
Two checks matter when choosing: will the mark survive shot blasting, pickling, coating or outdoor storage, and can it be read quickly by the people and scanners at the next step.
Where steel traceability usually breaks
Most failures happen in the gaps, not at the machines. Common ones: yard and warehouse moves made without a scan, so the system does not know where a coil is; slitting or cutting where the child pieces are not linked to the parent coil; relabeling after damage; mixed bundles; and manual transcription at the weighbridge or dispatch desk. Each gap is fixed the same way: make the scan part of the move itself, so the move cannot be completed without it.
How the systems fit together
Process control systems (Level 2) hold the process data for each heat and product: temperatures, speeds, times. A tracking or MES layer (Level 3) holds the genealogy, the locations and the movements. The ERP holds orders, stock and dispatch. Traceability works when the tracking layer receives an event at every critical point, links it to the right ID, and passes the result to the ERP without retyping. Handheld scanners, fixed readers at gates and cranes, and PLC signals at the lines are the usual capture points.
What we have built for steel
Our engineers built material tracking for an integrated steel plant in India covering warehouses, central stores and vendor yards. Company reported figures from that work include more than 720,000 material movements tracked per day and a 90 percent reduction in dispatch errors after RFID and barcode based dispatch. These figures are company reported, not independently audited, and are not a promise for another plant. The case study linked below describes the project.
How to start
Pick one product route, for example billet to wire rod coil to dispatch. List every point where the product changes shape, location or owner. Choose a marking and a capture method for each point, then run a mock recall: start from one customer complaint and time how long it takes to find the heat and every sister product. That time is the number to improve.
Related questions
Ajinkya Technologies builds MES, traceability, RFID and IIoT systems for manufacturers in India and the US from Belagavi and Bengaluru. Questions: bdo@ajinkyatechnologies.in.
References and scope
- Ajinkya Technologies: steel plant material traceability case study
- Samsung: Ajinkya Technologies warehouse automation story
External references explain the underlying technology or regulatory context. Ajinkya pricing, schedules and project results are company provided estimates or examples, not independently audited industry benchmarks. Confirm scope and current requirements before making a purchasing decision.
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Reviewed by Amey Kadle, Founder, Ajinkya Technologies. Last reviewed: .