H21
USA ASTM H21 Tool Die Steels Hot-Work Tool Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application |
|---|---|---|---|---|---|
| Steel Grades | Tool Die Steels | H21 | ASTM | USA | Hot-Work Tool Steel |
Chemical composition(mass fraction)(wt.%) of the H21
| C | Si | Mn | P | S | Cr | Mo | V | W | Ni＋Cu |
|---|---|---|---|---|---|---|---|---|---|
| 0.26 -0.36 | 0.15 -0.50 | 0.15 -0.40 | ≤0.030 | ≤0.030 | 3.00 -3.75 | ≤ ≥ | 0.30 -0.60 | 8.50 -10.00 | ≤0.75 |
Mechanical Properties of steel grade H21
| 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) |
|---|---|---|---|---|---|---|
| 514 (≥) | 164 (≥) | 44 | 34 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 442 |
Physical Properties of steel grade H21
| 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 |
|---|---|---|---|---|---|---|---|
| 23 | – | – | 0.41 | – | |||
| 424 | 131 | – | 23.3 | 121 | – | ||
| 567 | – | 42 | 31.2 | 312 | 242 |
Heat Treatment of steel grade H21
Heat treated : 1332°C – 1231°C
Technological Curves of steel grade H21
No Curve