DIN 17350 S7-4-2-5 Introduce
DIN 17350 S7-4-2-5 is a type of tool steel, which are alloys used for cutting and machining. These alloys are suitable for machining in areas that require high hardness and wear resistance, such as milling cutters and plastics molding tools. Since the 1920s, this type of tool steel has been used to make industrial tools, machine parts and consumer goods.
Smelting temperature:1756°C - 1437°C
Application:Tool Steels; Technical Conditions of Delivery
DIN 17350 S7-4-2-5 Material Chemical Composition
The chemical composition of the DIN 17350 S7-4-2-5 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Tungsten (W) | 6.6000 | 7.1000 |
| Vanadium (V) | 1.7000 | 1.9000 |
| Silicon (Si) | - | 0.4500 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Molybdenum (Mo) | 3.6000 | 4.0000 |
| Chromium (Cr) | 3.8000 | 4.5000 |
| Cobalt (Co) | 4.8000 | 5.2000 |
| Carbon (C) | 1.0500 | 1.1500 |
DIN 17350 S7-4-2-5 Material Mechanical Properties
The mechanical properties of the DIN 17350 S7-4-2-5 steel are as follows:
| YieldRp0.2 | ≤ 537 (MPa) |
| TeileRm | ≤ 793 (MPa) |
| ImpactKV/Ku | 14(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 444 |
DIN 17350 S7-4-2-5 Material Thermal Properties
The thermal performance parameters of the DIN 17350 S7-4-2-5 steel are as follows:
| Temperature (°C) | 41 | 336 | 414 |
| Modulus of elasticity (GPa) | - | 654 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 13 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 131 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 312 |
| Poisson’s coefficient, ν | - | - | 132 |