France AFNOR NF EN 10090, 1.4866 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 | 1.4866 | AFNOR | France | Valve steels and alloys for internal combustion engines | 
| C | Si | Mn | P | S | Cr | Ni | Mo | W | N | 
|---|---|---|---|---|---|---|---|---|---|
| 0.28 -0.38 | 0.50 -1.50 | 1.50 -3.50 | ≤0.045 | ≤0.030 | 22.00 -24.00 | 7.00 -9.00 | ≤0.50 | ≤0.50 | 0.25 -0.35 | 
| 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) | 
|---|---|---|---|---|---|---|
| 283 (≥) | 757 (≥) | 43 | 44 | 42 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 413 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 31 | - | - | 0.23 | - | |||
| 697 | 799 | - | 23.3 | 433 | - | ||
| 616 | - | 42 | 43.2 | 111 | 324 | 
Heat treated : 1599°C - 1591°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| X33CrNiMnN23-8 | |||
| X33CrNiMnN23-8 | 
| NF EN 10090 | Valve steels and alloys for internal combustion engines | NF-EN-10090.pdf | 
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