Recommended Heat Treat Cycles prior to TDX Treatment

Heat Treating for High Hardness (Compressive Strength)

machining tool steelsFollow the manufacturer's recommendation on the austenitizing temperature for the steel.

To prepare the tooling for TDX Coating with an emphasis on high hardness, temper (at least 2 times) at the lowest recommended temperature.
For example, D-2 would be austenitized at approximately 1875 °F then tempered at approximately 400 °F. Cross-sectional thickness will determine the appropriate time value for each step. Communicate with Tool Dynamics about those heat-treat and tempering temperatures—Tool Dynamics will use those same temperatures in the post-hardening process to preserve high hardness.

Heat Treating for Dimensional Control / High Ductility

Use the manufacturer-recomended austenitizing temperature for the steel in this situation as well.

To prepare the tooling for TDX Coating with an emphasis on dimensional control, temper (at least 2 times) at the highest recommended temperature.
For example, D-2 would be austenitized at approximately 1875 °F then tempered at approximately 975 °F. Cross-sectional thickness will determine the appropriate time value for each step. Communicate with Tool Dynamics about those heat-treat and tempering temperatures—Tool Dynamics will use those same temperatures to maintain critical dimensions and preserve ductility.

Stress Relieving

When machining large sections where extensive stock removal is necessary, parts should be stress relieved prior to semi-finish machining. See the tool-steel manufacturer's instructions for stress relieving.


A typical cycle for a piece of tool steel should be as follows:

  1. Rough Machining
  2. Stress Relief
  3. Semi-Finish Machining
  4. Hardening Heat Treatment, Double or Triple Temper
  5. Finish Grind and Polish
  6. TDX Treatment
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