Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.04 | 0.10 | ||
| Si | - | 1.00 | ||
| Mn | - | 1.00 | ||
| P | - | 0.020 | ||
| S | - | 0.015 | ||
| Cr | 18.00 | 21.00 | ||
| Mo | - | - | ||
| Ni | 65.00 | - | ||
| Al | 1.00 | 1.80 | ||
| Fe | - | 3.00 | ||
| Co | - | 2.00 | ||
| B | - | 0.008 | ||
| Cu | - | 0.20 | ||
| Ti | 1.80 | 2.70 |
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) |
|---|---|---|---|---|---|---|
| 442 (≥) | 438 (≥) | 33 | 22 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 342 |
| 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 |
|---|---|---|---|---|---|---|---|
| 474 (≥) | 642 (≥) | 34 | 13 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 231 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 157 | 529 | 563 |
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