France AFNOR NF A 35-579, NC20TA 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 | NC20TA | AFNOR | France | Valve steels and alloys for internal combustion engines |
C | Si | Mn | P | S | Cr | Ni | Mo | Al | Ti | Fe | Co | Cu | B |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0.04 -0.10 | ≤1.00 | ≤1.00 | ≤0.020 | ≤0.015 | 18.00 -21.00 | ≤remaining | ≤ ≥ | 1.00 -1.80 | 1.80 -2.70 | ≤3.00 | ≤2.00 | ≤0.20 | ≤0.0080 |
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) |
---|---|---|---|---|---|---|
492 (≥) | 737 (≥) | 12 | 12 | 23 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 324 |
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 |
---|---|---|---|---|---|---|---|
21 | - | - | 0.23 | - | |||
746 | 522 | - | 44.3 | 344 | - | ||
194 | - | 31 | 21.2 | 421 | 332 |
Heat treated : 1465°C - 1535°C
Grade | Standard | Country | Application |
---|---|---|---|
NC20TA |
NF A 35-579 | Valve steels and alloys for internal combustion engines | NF-A-35-579.pdf |
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