Distinguish transformation diagrams, medium curves and workpiece curves
A CCT diagram describes continuous-cooling transformations for specific composition, austenitising and test conditions. A standard-probe curve describes the medium under specified probe and test conditions. An internal workpiece curve records temperature at a particular location in the actual part.
These can be analysed together, but simply overlaying them does not guarantee a hardness throughout the part. In heavy sections, internal heat transfer governs core cooling, which differs substantially from a small probe.
1. Check material and test conditions
A grade permits a composition range, and heats and heating conditions affect transformation behaviour. Check composition, austenitising and specimen conditions—not just a similar grade name—before using a CCT diagram.
Hardenability describes the ability to develop a hardened structure into the section; attainable hardness is a different property. High surface hardness does not establish through-hardening of a thick section.
2. Examine critical intervals, not just peak cooling rate
Maximum cooling rate is only a peak. Relevant intervals depend on transformations and the target microstructure. Neither 800–500°C nor 300°C is a universal transformation boundary for all materials.
AR-HCCI focuses on coordinating high- and low-temperature cooling. Its page compares different bath temperatures and air cooling, showing rates and times at selected temperatures. These compare media; they are not a universal operating window for every high-chromium cast iron workpiece.
3. Relate medium performance to the actual workpiece
Connect material requirements with actual workpiece conditions. Select a cooling-characteristic tester to assess the fluid, or internal temperature measurement to examine the part. Each product addresses a separate task and does not require buying a complete system.
Anran’s technical team advises on application for the specific part. The patent-based intelligent-system method is explained separately.
If core cooling is insufficient in a critical interval, consider both medium capacity and internal heat transfer. Large local differences also call for checks of shielding, loading and flow. “Faster” does not solve every problem.
Selecting Anran products
Start with AR-HCCI for high-chromium cast iron, AR-SAG for large Cr–Mo steel SAG liners, AR-UHS when stronger cooling is needed, and AR-GP for conventional water-based production. SYQ-2 tests the medium; internal temperature measurement examines the workpiece.
A concise engineering record
Retain heat identity, heating conditions, dimensions, working-fluid condition, relative motion, measurement locations and post-quench checks. Matched records show what changed and what the next adjustment achieved.
You can contact us without a complete dataset. Tell us the workpiece and current problem to start product selection.