EN 10085 Grade 34CrAlMo5 surface hardened
EN 10085 Grade 34CrAlMo5 surface hardened introduction
The nitriding steel 34 CrAlMo 5 can undergo quenchhardening and is used for parts of hot steam fittings that have a high fatigue strength at temperatures from 350 to 500 degrees C.
Suitable for dimensions of up to 80 mm.
Construction components: valve spindles and plates. Further use: plunger pistons, piston rods, spindles in grinders and milling machines, measuring equipment.
The steel contains a nitride agent (Cr) which contributes through the nitriding process or the nitro-carburization process with N or N and C to a higher:
- case hardness
- abrasion resistance
- fatigue strength
and
- corrosion resistance.
It is used for forged construction components: quench-hardened, mechanically processed and treated thermo-chemically (for example nitriding).
The steel with an increased Al-content is susceptible to increased decarbonization. The forging requires sufficient additives for processing so that the finished construction component can undergo the nitriding process without decarburization.
Equivalent material: NBN 34CrAlMo5, ISO 33CrAlMo5-4, UNI 34CrAlMo7, UNE F.1741-34CrAlMo5, ASTM A355 Grade D, DIN 34CrAlMo5-10, DIN 1.8507, EN 34CrAlMo5-10, EN 1.8507, DIN 1.8807, EN 1.8807
EN 10085 Grade 34CrAlMo5 surface hardened general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.83 g/cm³ |
EN 10085 Grade 34CrAlMo5 surface hardened thermal
| Property |
Temperature |
Value |
| Coefficient of thermal expansion |
-100.0 °C |
Coefficient of thermal expansion of 1.05E-5 1/K |
| - |
20.0 °C |
Coefficient of thermal expansion of 1.15E-5 1/K |
| - |
100.0 °C |
Coefficient of thermal expansion of 1.21E-5 1/K |
| - |
200.0 °C |
Coefficient of thermal expansion of 1.27E-5 1/K |
| - |
300.0 °C |
Coefficient of thermal expansion of 1.32E-5 1/K |
| - |
400.0 °C |
Coefficient of thermal expansion of 1.36E-5 1/K |
| - |
500.0 °C |
Coefficient of thermal expansion of 1.4E-5 1/K |
| - |
600.0 °C |
Coefficient of thermal expansion of 1.44E-5 1/K |
| Max service temperature, long |
- |
Max service temperature, long of 350 - 500 °C |
| Specific heat capacity |
-100.0 °C |
Specific heat capacity of 423 J/(kg·K) |
| - |
20.0 °C |
Specific heat capacity of 461 J/(kg·K) |
| - |
100.0 °C |
Specific heat capacity of 479 J/(kg·K) |
| - |
200.0 °C |
Specific heat capacity of 499 J/(kg·K) |
| - |
300.0 °C |
Specific heat capacity of 517 J/(kg·K) |
| - |
400.0 °C |
Specific heat capacity of 536 J/(kg·K) |
| - |
500.0 °C |
Specific heat capacity of 558 J/(kg·K) |
| - |
600.0 °C |
Specific heat capacity of 587 J/(kg·K) |
| Thermal conductivity |
20.0 °C |
Thermal conductivity of 45.1 W/(m·K) |
| - |
100.0 °C |
Thermal conductivity of 45.1 W/(m·K) |
| - |
200.0 °C |
Thermal conductivity of 44.1 W/(m·K) |
| - |
300.0 °C |
Thermal conductivity of 41.9 W/(m·K) |
| - |
400.0 °C |
Thermal conductivity of 39.4 W/(m·K) |
| - |
500.0 °C |
Thermal conductivity of 36.9 W/(m·K) |
| - |
600.0 °C |
Thermal conductivity of 34.4 W/(m·K) |
| Thermal diffusivity |
20.0 °C |
Thermal diffusivity of 12.5 mm²/s |
| - |
100.0 °C |
Thermal diffusivity of 11.6 mm²/s |
| - |
200.0 °C |
Thermal diffusivity of 10.6 mm²/s |
| - |
300.0 °C |
Thermal diffusivity of 9.5 mm²/s |
| - |
400.0 °C |
Thermal diffusivity of 8.4 mm²/s |
| - |
500.0 °C |
Thermal diffusivity of 7.1 mm²/s |
| - |
600.0 °C |
Thermal diffusivity of 5.8 mm²/s |
EN 10085 Grade 34CrAlMo5 surface hardened chemical
| Property |
Value |
| Aluminium |
Aluminium of 0.8 - 1.2 % |
| Carbon |
Carbon of 0.3 - 0.37 % |
| Chromium |
Chromium of 1 - 1.3 % |
| Manganese |
Manganese of 0.5 - 0.8 % |
| Molybdenum |
Molybdenum of 0.15 - 0.25 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.03 % |
EN 10085 Grade 34CrAlMo5 surface hardened electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 2.31E-7 Ω·m |
| - |
100.0 °C |
Electrical resistivity of 2.84E-7 Ω·m |
| - |
200.0 °C |
Electrical resistivity of 3.58E-7 Ω·m |
| - |
300.0 °C |
Electrical resistivity of 4.48E-7 Ω·m |
| - |
400.0 °C |
Electrical resistivity of 5.52E-7 Ω·m |
| - |
500.0 °C |
Electrical resistivity of 6.71E-7 Ω·m |
| - |
600.0 °C |
Electrical resistivity of 8.06E-7 Ω·m |
EN 10085 Grade 34CrAlMo5 surface hardened mechanical
| Property |
Temperature |
Value |
| Elastic modulus |
-100.0 °C |
Elastic modulus of 217 GPa |
| - |
20.0 °C |
Elastic modulus of 212 GPa |
| - |
100.0 °C |
Elastic modulus of 207 GPa |
| - |
200.0 °C |
Elastic modulus of 199 GPa |
| - |
300.0 °C |
Elastic modulus of 192 GPa |
| - |
400.0 °C |
Elastic modulus of 184 GPa |
| - |
500.0 °C |
Elastic modulus of 175 GPa |
| - |
600.0 °C |
Elastic modulus of 164 GPa |
| Poisson's ratio |
20.0 °C |
Poisson's ratio of 0.28 [-] |
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