ISO 4957 Grade S 2-9-2 – Ultra‑Hard Mo‑V High‑Speed Steel for Precision Cutting Tools
Very tough Mo-V-alloyed high speed steel with good cut accuracy and hot hardness. Application: cutter, spiral drills, tapper, saw tooths
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 20.0 °C | 8.12 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 20.0 °C | 224 GPa | |
100.0 °C | 220 GPa | ||
200.0 °C | 214 GPa | ||
300.0 °C | 207 GPa | ||
400.0 °C | 199 GPa | ||
500.0 °C | 191 GPa | ||
600.0 °C | 180 GPa | ||
Hardness, Rockwell C | 20.0 °C | 58.5 - 68.5 [-] | |
Plane-Strain Fracture Toughnes | 20.0 °C | 10.9 - 19.8 MPa·√m | |
Poisson's ratio | 20.0 °C | 0.28 [-] | |
Shear modulus | 23.0 °C | 79 GPa | Typical for Tool And Machining Steel |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | -100.0 °C | 9.6E-6 1/K | |
20.0 °C | 1.05E-5 1/K | ||
100.0 °C | 1.11E-5 1/K | ||
200.0 °C | 1.16E-5 1/K | ||
300.0 °C | 1.2E-5 1/K | ||
400.0 °C | 1.24E-5 1/K | ||
500.0 °C | 1.27E-5 1/K | ||
600.0 °C | 1.3E-5 1/K | ||
Melting point | 1370 - 1425 °C | Typical for Tool And Machining Steel | |
Specific heat capacity | 23.0 °C | 420 - 460 J/(kg·K) | Typical for Tool And Machining Steel |
Thermal conductivity | 20.0 °C | 27.6 W/(m·K) | |
100.0 °C | 27.9 W/(m·K) | ||
200.0 °C | 27.7 W/(m·K) | ||
300.0 °C | 27.5 W/(m·K) | ||
400.0 °C | 27 W/(m·K) | ||
500.0 °C | 26.6 W/(m·K) | ||
600.0 °C | 26.1 W/(m·K) | ||
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 20.0 °C | 5.24E-7 Ω·m |
100.0 °C | 5.81E-7 Ω·m | |
200.0 °C | 6.64E-7 Ω·m | |
300.0 °C | 7.51E-7 Ω·m | |
400.0 °C | 8.44E-7 Ω·m | |
500.0 °C | 9.41E-7 Ω·m | |
600.0 °C | 1.04E-6 Ω·m | |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.97 - 1.07 % |
Chromium | 3.5 - 4.2 % |
Manganese | 0.4 % |
Molybdenum | 8 - 9.2 % |
Phosphorus | 0.03 % |
Silicon | 0.45 % |
Sulfur | 0.03 % |
Tungsten | 1.5 - 2 % |
Vanadium | 1.8 - 2.2 % |
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