Measure temperature of the remelt batch at the large foundry
Re-melting scrap makes each batch a new challenge, as input composition varies.
Recycling scrap is harder than using virgin materials: each batch of scrap has a different composition, so subsequent melts cannot simply repeat previous ones even with the same formula.
For large foundries, controlling two key parameters is sufficient to significantly reduce scrap: pouring temperature and the carbon-silicon composition of each melt batch. This article outlines a batch-by-batch inspection procedure.
Key Control Points
First-time measurement
The first batch of the new scrap lot requires closer inspection to determine the deviation from expectations.
Not a component
Calculate carbon and ferrosilicon quantities based on measurement results, not fixed formulas.
Pouring temperature
Measure at the ladle immediately before pouring; remelted batches often have higher temperatures, making it easy to overheat during pouring.
Batch record
Record scrap lot codes and results to identify which lots need adjustments in the future.
Real-world experience
- Sort scrap by source before melting to minimize fluctuations across all equipment.
- Keep the standard batch sample for comparison when changing lots.
- Track scrap rejection rate per batch over the past few months.
Compatible device
CYY-LK7 Cast Iron, Gray Iron, and Ductile Iron Analyzer
Gray Cast and Ductile Iron Analyzer CYY-LK7 — Analyzes C, Si, Mn, CEL, spheroidization ratio, tensile strength, and hardness. CE certified with 15-inch-inch TFT display.
Reference price: 1700-1900 USD
CYY-W600 Large-Screen Molten Metal Pyrometer
CYY-W600 Large-Screen Molten Metal Thermometer — Measures Cast Iron, Steel, Copper, and Aluminum. CE Certified with English Interface.
Reference price: 400-500 USD
CYY-QC2 Square Carbon Silicon Probe Cup
CYY-QC2 Square carbon silicon sampling cups for C-Si analyzers. Integrated with Tellurium to measure C%, Si%, CE, and CEL. A flagship product in the Changyouyi square cup series.
Reference price: 0.6-1.6 USD
Frequently Asked Questions
Does repeated reheating affect the quality of cast iron?
Yes. Repeated reheating increases impurities and alters the microstructure, so a more thorough composition check is required.
Do I need to measure every batch?
For large foundries, measure every batch; for small foundries, measure the first and last batch of each lot.
Related topics
Reference content from Changyouyi's technical article: original post on Sohu.
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