SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT)
SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT) introduction
The high temperature alloy steel 23CrNiMo7-4-7 is used for larger preshaped components in the quenched and tempered condition in turbine and generator installations, in particular as shafts and discs.
The steel is weldable if the relevant measures required are observed.
Equivalent material: DIN 1.6749, EN 23CrNiMo7-4-7, EN 1.6749
SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT) general
| Property | Temperature | Value |
|---|---|---|
| Density | 20.0 °C | Density of 7.85 g/cm³ |
SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT) thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
| 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 1.11E-5 - 1.21E-5 1/K | - |
| - | 200.0 °C | Coefficient of thermal expansion of 1.21E-5 - 1.27E-5 1/K | - |
| - | 300.0 °C | Coefficient of thermal expansion of 1.29E-5 - 1.32E-5 1/K | - |
| - | 400.0 °C | Coefficient of thermal expansion of 1.35E-5 - 1.36E-5 1/K | - |
| - | 500.0 °C | Coefficient of thermal expansion of 1.39E-5 - 1.4E-5 1/K | - |
| - | 600.0 °C | Coefficient of thermal expansion of 1.41E-5 - 1.44E-5 1/K | - |
| Max service temperature, long | - | Max service temperature, long of 370 - 480 °C | - |
| Melting point | - | Melting point of 1382 - 1529 °C | Typical for Nickel Chromium Molybdenum Steel |
| 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 47.1 W/(m·K) | - |
| - | 100.0 °C | Thermal conductivity of 43 - 47.1 W/(m·K) | - |
| - | 200.0 °C | Thermal conductivity of 42 - 45.9 W/(m·K) | - |
| - | 300.0 °C | Thermal conductivity of 40 - 43.8 W/(m·K) | - |
| - | 400.0 °C | Thermal conductivity of 37 - 41.3 W/(m·K) | - |
| - | 500.0 °C | Thermal conductivity of 34 - 38.7 W/(m·K) | - |
| - | 600.0 °C | Thermal conductivity of 36 W/(m·K) | - |
| Thermal diffusivity | 20.0 °C | Thermal diffusivity of 13 mm²/s | - |
| - | 100.0 °C | Thermal diffusivity of 12.1 mm²/s | - |
| - | 200.0 °C | Thermal diffusivity of 11.1 mm²/s | - |
| - | 300.0 °C | Thermal diffusivity of 9.9 mm²/s | - |
| - | 400.0 °C | Thermal diffusivity of 8.7 mm²/s | - |
| - | 500.0 °C | Thermal diffusivity of 7.4 mm²/s | - |
| - | 600.0 °C | Thermal diffusivity of 6 mm²/s | - |
SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT) chemical
| Property | Value |
|---|---|
| Carbon | Carbon of 0.2 - 0.26 % |
| Chromium | Chromium of 1.7 - 2 % |
| Manganese | Manganese of 0.5 - 0.8 % |
| Molybdenum | Molybdenum of 0.6 - 0.8 % |
| Nickel | Nickel of 0.9 - 1.2 % |
| Phosphorus | Phosphorus of 0.01 - 0.02 % |
| Silicon | Silicon of 0.3 % |
| Sulfur | Sulfur of 0.007 - 0.018 % |
SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT) electrical
| Property | Temperature | Value |
|---|---|---|
| Electrical resistivity | 20.0 °C | Electrical resistivity of 2.21E-7 Ω·m |
| - | 100.0 °C | Electrical resistivity of 2.72E-7 Ω·m |
| - | 200.0 °C | Electrical resistivity of 3.44E-7 Ω·m |
| - | 300.0 °C | Electrical resistivity of 4.28E-7 Ω·m |
| - | 400.0 °C | Electrical resistivity of 5.26E-7 Ω·m |
| - | 500.0 °C | Electrical resistivity of 6.39E-7 Ω·m |
| - | 600.0 °C | Electrical resistivity of 7.7E-7 Ω·m |
SEW 555 Grade 23CrNiMo7-4-7 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 - 200 GPa | - |
| - | 300.0 °C | Elastic modulus of 192 - 193 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, transverse | 20.0 °C | Elongation, transverse of 12 % | - |
| Poisson's ratio | 23.0 °C | Poisson's ratio of 0.29 [-] | Typical for Nickel Chromium Molybdenum Steel |
| Reduction of area, transverse | 20.0 °C | Reduction of area, transverse of 40 % | - |
| Tensile strength, transverse | 20.0 °C | Tensile strength, transverse of 750 - 900 MPa | - |
| Yield strength Rp0.2 | 100.0 °C | Yield strength Rp0.2 of 565 MPa | - |
| - | 200.0 °C | Yield strength Rp0.2 of 535 MPa | - |
| - | 250.0 °C | Yield strength Rp0.2 of 515 MPa | - |
| - | 300.0 °C | Yield strength Rp0.2 of 490 MPa | - |
| - | 350.0 °C | Yield strength Rp0.2 of 435 MPa | - |
| - | 400.0 °C | Yield strength Rp0.2 of 405 MPa | - |
| - | 450.0 °C | Yield strength Rp0.2 of 375 MPa | - |
| Yield strength Rp0.2, transverse | 20.0 °C | Yield strength Rp0.2, transverse of 600 MPa | - |
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