France AFNOR NF A 35-579, Z53CMNS21-09Az 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 | Z53CMNS21-09Az | AFNOR | France | Valve steels and alloys for internal combustion engines | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb | N | 
|---|---|---|---|---|---|---|---|---|---|
| 0.48 -0.58 | ≤0.25 | 8.00 -10.00 | ≤0.040 | ≤0.020 | 20.00 -22.00 | 3.25 -4.50 | ≤ ≥ | 1.70 -2.30 | 0.38 -0.55 | 
| 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) | 
|---|---|---|---|---|---|---|
| 527 (≥) | 888 (≥) | 11 | 42 | 44 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 124 | 
| 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 | 
|---|---|---|---|---|---|---|---|
| 43 | - | - | 0.44 | - | |||
| 359 | 565 | - | 32.3 | 344 | - | ||
| 359 | - | 22 | 43.2 | 244 | 442 | 
Heat treated : 1842°C - 1162°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| Z53CMNS21-09Az | 
| NF A 35-579 | Valve steels and alloys for internal combustion engines | NF-A-35-579.pdf | 
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