Steel producers generally have traceability in the sense that the information exists. The heat number is on the melt shop log, the test results are in the laboratory system, the despatch is in the commercial system, and a determined person with a morning to spare can connect them. What they often do not have is traceability in the sense that matters: the ability to ask what a despatched tonne cost and be answered without that morning.
Cost per tonne moves with grade, section, scrap mix, power tariff block and yield, and those move within a campaign, not between accounting periods. If power, fuel, electrode and alloy consumption are attributed to the period rather than to the heat, the plant knows its conversion cost accurately about five weeks after it has finished quoting against it. Sections that lose money consistently keep being sold, because at standard cost they look fine.
Attributing consumption to the heat and carrying it forward through rolling and finishing changes the commercial conversation rather than the metallurgical one. Burning loss, crop and rejection become measurable by grade and shift. Two or three sections usually turn out to be loss-making at their real conversion cost — a finding that is uncomfortable for a week and valuable for years.
The same record pays for itself again at the quality end. When test results are captured against the heat rather than retyped into a certificate template, the mill test certificate is generated from evidence instead of from transcription. Transcription errors are rare, but each one costs a rejected consignment and an argument about which heat the material came from.
None of this requires the plant to be instrumented to the last sensor. It requires the heat number to be the spine that production, quality, costing and despatch all hang from, which is a data design decision more than a capital one.
