24 July 2021 Mould Steel Bar
55NiCrMoV7 Mould Steel Bar
55NiCrMoV7 tool steel is in the general class of alloy, oil-hardening tool steel that is characterized by good toughness. 55NiCrMoV7 tool steel is suitable for use as tools, dies, and machine parts, which require a good combination of hardness and toughness.
Due to its lower carbon content and relatively high nickel content, 55NiCrMoV7 steel has slightly better shock-resistance than more highly alloyed types and should be used where some wear-resistance can be sacrificed for increased toughness.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Mo(％) | V(%) |
|---|---|---|---|---|---|---|---|---|
| 0.50-0.60 | 0.10-0.40 | 0.65-0.95 | 0.030 | 0.020 | 0.95-1.25 | 1.50-2.00 | 0.30-0.50 | 0.05-0.25 |
Mechanical Properties:
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 924 (≥) | 151 (≥) | 14 | 24 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 231 |
Physical Properties:
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν |
|---|---|---|---|---|---|---|---|
| 12 | - | - | 0.43 | - | |||
| 334 | 919 | - | 11.3 | 134 | - | ||
| 452 | - | 42 | 14.2 | 344 | 414 |