France AFNOR X53CrMnNiNbN21-9 Valve Internal Combustion Engines steel (NF-EN 1009-1998) and X53CrMnNiNbN21-9 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Type | Steel Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Valve Steel | X53CrMnNiNbN21-9 | AFNOR | France | Valve Internal Combustion Engines steel (NF-EN 1009-1998) | 
| 1.4731 | |||||
| 1.4718 | |||||
| X33CrNiMnN23-8 | |||||
| 1.4866 | |||||
| X53CrMnNiN21-9 | |||||
| 1.4871 | |||||
| X55CrMnNiN20-8 | |||||
| 1.4875 | |||||
| X50CrMnNiNbN21-9 | |||||
| 1.4882 | 
| C(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Ni(%) | N(%) | Other(%) | 
|---|---|---|---|---|---|---|---|---|
| 0.48-0.58 | Max 0.45 | 8.00-10.0 | Max 0.045 | Max 0.030 | 20.0-22.0 | 3.25-4.50 | 0.38-0.50 | C+N Max 0.90 | 
| 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) | 
|---|---|---|---|---|---|---|
| 997 (≥) | 644 (≥) | 41 | 24 | 42 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 134 | 
| 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 | - | - | 0.34 | - | |||
| 914 | 553 | - | 43.3 | 122 | - | ||
| 647 | - | 31 | 34.2 | 311 | 123 | 
Heat treated : 1838°C - 1645°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| X53CrMnNiNbN21-9 | DIN | Germany | Valve steel | 
| X53CrMnNiNbN21-9 | AFNOR | France | Valve Internal Combustion Engines steel (NF-EN 1009-1998) | 
| ISO X53CrMnNiNbN21 9 | ISO | ISO | ISO standard valve austenite steel | 
| EN X53CrMnNiNbN21-9 | EN | Euronorm | Euronorm Stainless Steel | 
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