Compare methods for checking CE and C% before the furnace
Four non-competing carbon checks answer four distinct questions across different timeframes.
There are four common methods to determine the composition of cast iron: visual inspection, chemical analysis, thermal analysis, and spectroscopy. Each method answers different questions with varying response times, so they typically complement rather than replace one another.
The table below focuses on result turnaround time and suitability for on-site decision-making, the two most critical criteria when selecting a method.
Key Control Points
Visual inspection
Instant, cost-free, but qualitative and reliant on experienced personnel.
Chemical Analysis
Accurate but slow; better suited for verification and record-keeping than for making funding decisions.
Thermal analysis
Results in 2-3 minutes at the furnace with C%, Si% and associated indices; suitable for batch adjustment.
Spectrum
Multiple elements require careful sample preparation and fixed equipment; suitable for laboratories and periodic testing.
Real-world experience
- Combine furnace thermal analysis with periodic laboratory testing for cross-verification.
- Clearly state the method on the batch sheet to avoid comparing data from two different methods.
- For ductile iron, add microstructure analysis when confirming the organization.
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-TL5 Infrared Carbon-Sulfur Analyzer for Machining Manufacturing Plants
CYY-TL5 Infrared Carbon-Sulfur Analyzer — Fast C% and S% testing in steel, results in 35 seconds/sample, at just 1/5 the cost of OES.
Reference price: 4000-6000 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
Which method is the most accurate?
Chemical and spectral analysis offer higher accuracy but are slower. In-oven decisions prioritize speed over precision.
Can a single method be used?
Works well with small workshops, but should be periodically cross-checked with a laboratory to detect systematic errors.
Related topics
- Equivalent Carbon (CE) and how the calculator determines C% and Si%
- Thermal analysis for cast iron: from sampling to results
Reference content from Changyouyi's technical article: original post on Sohu.
Need help configuring the system for your furnace, metal type, and measurement frequency?
Request consultation