Steel for intake valves
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.37 | 0.44 | ||
| Si | 0.15 | 0.35 | ||
| Mn | 0.65 | 1.10 | ||
| P | - | 0.035 | ||
| S | - | 0.04 | ||
| Cr | 0.75 | 1.20 | ||
| Mo | 0.15 | 0.25 |
Steel for intake valves
| 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) |
|---|---|---|---|---|---|---|
| 485 (≥) | 998 (≥) | 23 | 22 | 34 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 443 |
| 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 |
|---|---|---|---|---|---|---|---|
| 695 (≥) | 726 (≥) | 24 | 33 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 124 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 362 | 225 | 154 |
We can customize the production of NV7(4140) grade, contact us for the best solution.
–sales@specificsteel.com