Which foundry should use a liquid iron analyzer?
Most foundries fall into one of two scenarios: either they have composition data that no one uses, or they lack data entirely and rely solely on flame color for decisions.
In casting production, the interval between melting and pouring is typically very short. Whether carbon and silicon levels fall within specifications determines the microstructure and mechanical properties of the part after cooling. Consequently, many foundries have shifted composition testing from the lab to right before the furnace.
Not all workshops have the same needs. This article categorizes five common workshop types to help you assess your current situation before investing in analysis equipment.
Key Control Points
Gray iron foundry
Produce machine tool parts, pump housings, valves, and mechanical components. Gray iron is sensitive to equivalent carbon; therefore, measure C% and Si% in each batch to maintain fluidity and control shrinkage.
Steel foundry
In addition to C% and Si%, monitor the graphitization trend before and after spheroidizing; this group requires equipment with additional evaluation metrics.
Precision casting, continuous code changes
Each formula change requires a new code. The analyzer shortens the confirmation time after adjustments.
Use more recycled materials
Scrap, pig iron, and carbon additives vary by batch; testing each lot is the only way to determine its actual quality.
Real-world experience
- If you have a single product line with stable ingredients, you can inspect by batch instead of by lot.
- Even with a spectrometer, a pre-furnace thermal analyzer is still recommended because the two instruments answer different questions and have different wait times.
- Don't choose a device based on the number of features; choose it based on the capabilities you actually use every day.
Compatible device
CYY-LK2 Pre-furnace Rapid Carbon-Silicon Analyzer
Carbon-Silicon Analyzer CYY-LK2 — Analyze C and Si in molten iron before the furnace. CE certified, English interface.
Reference price: 700-800 USD
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-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
Do small workshops really need to buy an analyzer?
Not required if the recipe is fixed and scrap ratio is low. However, when frequently changing grades or using high amounts of scrap, an analysis device helps reduce the number of batches that need remelting.
Can a thermal analyzer replace spectroscopy?
No. Thermal analysis provides fast results in the furnace for C%, Si%, and associated indices; spectroscopy detects more elements but is slower and requires carefully prepared samples.
Related topics
- What is a liquid iron analyzer and what does it measure?
- Measurement range of the carbon silicon analyzer
Reference content from Changyouyi's technical article: original post on Sohu.
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