France AFNOR NF EN 10090, NiFe25Cr20NbTi Specialsteel Valve steels and alloys for internal combustion engines and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Specialsteel | NiFe25Cr20NbTi | AFNOR | France | Valve steels and alloys for internal combustion engines | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Al | Ti | Fe | B | Nb+Ta | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.04 -0.10 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.015 | 18.00 -21.00 | ≤remaining | ≤ ≥ | 0.30 -1.00 | 1.00 -2.00 | 23.00 -28.00 | ≤0.008 | 1.00 -2.00 | 
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) | 
|---|---|---|---|---|---|---|
| 658 (≥) | 193 (≥) | 11 | 21 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 144 | 
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν | 
|---|---|---|---|---|---|---|---|
| 22 | - | - | 0.14 | - | |||
| 416 | 853 | - | 44.3 | 221 | - | ||
| 375 | - | 12 | 43.2 | 131 | 441 | 
Heat treated : 1885°C - 1554°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| NiFe25Cr20NbTi | |||
| NiFe25Cr20NbTi | |||
| NiFe25Cr20NbTi | 
| NF EN 10090 | Valve steels and alloys for internal combustion engines | NF-EN-10090.pdf | 
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