 |
| |||
| flame hardening | |||
| skin hardening; surface quenching; surface hardening; hardening of carburized surface | |||
| superficial hardening | |||
| case hardening | |||
| trempe superficielle: 6 phrases in 4 subjects |
| Earth sciences | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 3 |
| Technology | 1 |