Does thermal conductivity of tool steel change with use?

Yes. Repeated thermal cycling can cause microstructural changes that gradually reduce thermal conductivity. Hot work steels like H13 may show 5–10% reduction in conductivity after extended service above 600°C due to carbide coarsening and tempering effects.

How does alloy content affect thermal conductivity?

Higher alloy content generally reduces thermal conductivity. Chromium, vanadium, and molybdenum in tool steels scatter phonons and electrons, reducing heat transfer. D2 steel's 12% chromium content explains its lower conductivity compared to low-alloy P20.

Can I use thermal conductivity data to predict cooling time?

Yes, with validated FEA models. The thermal diffusivity (conductivity divided by density × specific heat) is the key parameter for transient cooling analysis. Using handbook values with a 10% safety factor provides reliable mold cooling time estimates. ⚡ Calculated for Carbide-Tooling.com High-Performance Series. View Catalog →

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Die Steel Thermal Conductivity

Tool steel thermal conductivity varies significantly with temperature and alloy content.

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Steel GradeTemperature (°C)Reference: Steel grades with higher thermal conductivity cool faster in molds.

Conductivity

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kJ/h·m·K

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Die Steel Thermal Conductivity

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