- Country
- Steel Grade
- Standard
- Use
- France
- X45CrSi9-3
- AFNOR
- The internal combustion engine valve steels and alloys
- France
- 347F20
- AFNOR
- Resistance antihigh temperature boron-containing steel
- France
- Z6CNNb18.12B
- AFNOR
- Resistance antihigh temperature boron-containing steel
- France
- 321F20
- AFNOR
- Resistance antihigh temperature boron-containing steel
- France
- Z6CNT18.12B
- AFNOR
- Resistance antihigh temperature boron-containing steel