Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.28 | 0.38 | ||
| Si | 0.50 | 1.00 | ||
| Mn | 1.50 | 3.50 | ||
| P | - | 0.050 | ||
| S | - | 0.030 | ||
| Cr | 22.00 | 24.00 | ||
| Mo | - | 0.50 | ||
| Ni | 7.00 | 9.00 | ||
| W | - | 0.50 | ||
| N | 0.25 | 0.35 |
Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines
| Proof strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Impact energy KV (J) |
Elongation at fracture A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 782 (≥) | 154 (≥) | 31 | 12 | 44 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 |
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 697 (≥) | 357 (≥) | 14 | 41 | 33 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 324 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 229 | 286 | 298 |
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