| Steel grade | Standard | Application |
|---|---|---|
| 1.4875 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| X55CrMnNiN20-8 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| 1.4871 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| X53CrMnNiN21-9 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| 1.4866 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| X33CrNiMnN23-8 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| 1.4718 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| 1.4731 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| X40CrSiMo10-2 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| X45CrSi9-3 | AFNOR | Valve Internal Combustion Engines steel (NF-EN 1009-1998) |
| NC20TA | AFNOR | Steel Exhaust Valves |
| NC15Fe7TA | AFNOR | Steel Exhaust Valves |
| Z85CDV18-02 | AFNOR | Steel Exhaust Valves |
| Z80CNS20-02 | AFNOR | Steel Exhaust Valves |
| Z60CMDVNb21-10Az | AFNOR | Steel Exhaust Valves |
| Z55CMN20-08Az | AFNOR | Steel Exhaust Valves |
| Z53CMNS21-09Az | AFNOR | Steel Exhaust Valves |
| Z53CMNNb21-09-02Az | AFNOR | Steel Exhaust Valves |
| Z53CMN21-09Az | AFNOR | Steel Exhaust Valves |
| Z50CMNNb21-09-02Az | AFNOR | Steel Exhaust Valves |
| Z45CS9 | AFNOR | Steel Exhaust Valves |
| Z45CNW18-09 | AFNOR | Steel Exhaust Valves |
| Z40CSD10 | AFNOR | Steel Exhaust Valves |
| Z35CNWS14-14 | AFNOR | Steel Exhaust Valves |
| Z25CNWS20-09 | AFNOR | Steel Exhaust Valves |
| Z20CN21-12Az | AFNOR | Steel Exhaust Valves |
| Z12CKNDWNb21-20-20 | AFNOR | Steel Exhaust Valves |
| Z12CKNDWNb21-20-20 | AFNOR | The vent valve steel |
| A35-586 347F20 | AFNOR | Resistant to high boron steel(NF A 36-580(1983)) |
| Z6CNNb18.12B | AFNOR | Resistant to high boron steel(NF A 36-580(1983)) |
| A35-586 321F20 | AFNOR | Resistant to high boron steel(NF A 36-580(1983)) |
| Z6CNT18.12B | AFNOR | Resistant to high boron steel(NF A 36-580(1983)) |
| A35-586 316F22 | AFNOR | Resistant to high boron steel(NF A 36-580(1983)) |
| Z6CNDNb17.13B | AFNOR | Resistant to high boron steel |
| A35-586 316F21 | AFNOR | Resistant to high boron steel |