France AFNOR NF A 35-579, Z60CMDVNb21-10Az 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 | Z60CMDVNb21-10Az | AFNOR | France | Valve steels and alloys for internal combustion engines | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb | V | N | 
|---|---|---|---|---|---|---|---|---|---|---|
| 0.57 -0.65 | ≤0.25 | 9.50 -11.50 | ≤0.040 | ≤0.030 | 20.00 -22.00 | ≤1.50 | 0.75 -1.25 | 1.00 -1.20 | 0.75 -1.00 | 0.40 -0.60 | 
| 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) | 
|---|---|---|---|---|---|---|
| 433 (≥) | 277 (≥) | 12 | 31 | 44 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 233 | 
| 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 | - | - | 0.12 | - | |||
| 926 | 869 | - | 21.3 | 424 | - | ||
| 855 | - | 42 | 42.2 | 222 | 323 | 
Heat treated : 1531°C - 1465°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| Z60CMDVNb21-10Az | 
| NF A 35-579 | Valve steels and alloys for internal combustion engines | NF-A-35-579.pdf | 
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