EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT)
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) introduction
The nitriding steel 34CrAlNi7 can undergo quenchhardening and is used for heavy machine parts, piston rods, plunger pistons, spindles with particularly large dimensions.
The steel contains a nitride agent (Cr and Al) 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 case decarbonization. The forging requires sufficient additives for processing so that the finished construction component can undergo the nitriding process without decarburization.
Equivalent material: AFNOR 40CAD6-12, ASTM A355 Grade C, DIN 34CrAlNi7-10, DIN 1.8550, DIN 34CrAlNi7, EN 34CrAlNi7-10, EN 1.8550
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) general
| Property |
Temperature |
Value |
| Density |
20.0 °C |
Density of 7.8 g/cm³ |
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) 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 |
| 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 33.7 W/(m·K) |
| - |
100.0 °C |
Thermal conductivity of 36.2 W/(m·K) |
| - |
200.0 °C |
Thermal conductivity of 37.8 W/(m·K) |
| - |
300.0 °C |
Thermal conductivity of 37.2 W/(m·K) |
| - |
400.0 °C |
Thermal conductivity of 35.7 W/(m·K) |
| - |
500.0 °C |
Thermal conductivity of 34 W/(m·K) |
| - |
600.0 °C |
Thermal conductivity of 32 W/(m·K) |
| Thermal diffusivity |
20.0 °C |
Thermal diffusivity of 9.4 mm²/s |
| - |
100.0 °C |
Thermal diffusivity of 9.4 mm²/s |
| - |
200.0 °C |
Thermal diffusivity of 9.2 mm²/s |
| - |
300.0 °C |
Thermal diffusivity of 8.5 mm²/s |
| - |
400.0 °C |
Thermal diffusivity of 7.6 mm²/s |
| - |
500.0 °C |
Thermal diffusivity of 6.6 mm²/s |
| - |
600.0 °C |
Thermal diffusivity of 5.4 mm²/s |
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) chemical
| Property |
Value |
| Aluminium |
Aluminium of 0.8 - 1.2 % |
| Carbon |
Carbon of 0.3 - 0.37 % |
| Chromium |
Chromium of 1.5 - 1.8 % |
| Manganese |
Manganese of 0.4 - 0.7 % |
| Molybdenum |
Molybdenum of 0.15 - 0.25 % |
| Nickel |
Nickel of 0.85 - 1.15 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.4 % |
| Sulfur |
Sulfur of 0.03 % |
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) electrical
| Property |
Temperature |
Value |
| Electrical resistivity |
20.0 °C |
Electrical resistivity of 3.09E-7 Ω·m |
| - |
100.0 °C |
Electrical resistivity of 3.54E-7 Ω·m |
| - |
200.0 °C |
Electrical resistivity of 4.18E-7 Ω·m |
| - |
300.0 °C |
Electrical resistivity of 5.05E-7 Ω·m |
| - |
400.0 °C |
Electrical resistivity of 6.09E-7 Ω·m |
| - |
500.0 °C |
Electrical resistivity of 7.27E-7 Ω·m |
| - |
600.0 °C |
Electrical resistivity of 8.67E-7 Ω·m |
EN 10085 Grade 34CrAlNi7 quenched and tempered (+QT) mechanical
| Property |
Temperature |
Value |
Comment |
| 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 |
- |
| Elongation |
20.0 °C |
Elongation of 12 % |
- |
| Hardness, Brinell |
20.0 °C |
Hardness, Brinell of 12 - 13 [-] |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.3 [-] |
Typical for Steel |
| Tensile strength |
20.0 °C |
Tensile strength of 800 - 1050 MPa |
- |
| Yield strength |
20.0 °C |
Yield strength of 600 - 650 MPa |
- |
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