Heat Treatment Chart
A heat treatment chart is a graphical representation or table that outlines the different heat treatment processes,
temperatures, and cooling methods used to alter the microstructure and properties of metals, particularly steel.
Information Included in Heat Treatment Charts
- Heat Treatment Process: Annealing, normalizing, hardening, tempering, austempering,
martempering, etc.
- Temperature Range: The specific temperature range for each heat treatment process.
- Cooling Method: The method used to cool the metal, such as air cooling, oil quenching, water
quenching, or salt bath quenching.
- Resulting Microstructure: The microstructure that results from each heat treatment process,
such as ferrite, pearlite, martensite, or bainite.
- Properties: The resulting properties of the metal, such as hardness, toughness, strength,
ductility, and machinability.
Example of a Heat Treatment Chart
| Heat Treatment Process |
Temperature Range (°C) |
Cooling Method |
Resulting Microstructure |
Properties |
| Annealing |
800-900 |
Slow cooling |
Ferrite and pearlite |
Soft, ductile, and machinable |
| Normalizing |
900-950 |
Air cooling |
Fine pearlite |
Strong, tough, and less machinable |
| Hardening |
800-850 |
Quenching (oil/water) |
Martensite |
Hard, brittle, and wear-resistant |
Uses of Heat Treatment Charts
- Materials scientists: To understand the effects of heat treatment on different metals.
- Engineers: To select the appropriate heat treatment process for a specific application.
- Manufacturers: To ensure that their heat treatment processes are correct and effective.
