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) |
|---|---|---|---|---|---|---|
| 498 (≥) | 774 (≥) | 43 | 21 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 131 |
| 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 |
|---|---|---|---|---|---|---|---|
| 687 (≥) | 451 (≥) | 24 | 33 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 312 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 818 | 943 | 118 |
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