Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.40 | 0.50 | ||
| Si | 2.70 | 3.30 | ||
| Mn | - | 0.80 | ||
| P | - | 0.040 | ||
| S | - | 0.030 | ||
| Cr | 8.00 | 10.00 | ||
| Mo | - | - | ||
| Ni | - | 0.60 |
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) |
|---|---|---|---|---|---|---|
| 722 (≥) | 279 (≥) | 31 | 33 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 424 |
| 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 |
|---|---|---|---|---|---|---|---|
| 753 (≥) | 647 (≥) | 13 | 22 | 31 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 134 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 686 | 477 | 872 |
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