| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | annealing unit operation | material science | Critical process in metal industry for relieving internal stresses and improving metal properties | 1 |
| 2 | annealing unit operation | materials engineering | Critical process in heat treatment of metals for improving their mechanical properties | 1 |
| 3 | annealing unit operation | materials engineering | Critical step in materials manufacturing to relieve internal stresses and improve material properties | 1 |