General

Property | Temperature | Value |
---|---|---|

Density | 23.0 °C | 8.26 g/cm³ Show Supplier Material materials with Density of 8.26 g/cm³ |

Mechanical

Property | Temperature | Value | Comment |
---|---|---|---|

Creep strength | 550.0 °C | 810 MPa Show Supplier Material materials with Creep strength of 810 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition |

600.0 °C | 620 MPa Show Supplier Material materials with Creep strength of 620 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition | |

650.0 °C | 425 MPa Show Supplier Material materials with Creep strength of 425 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition | |

700.0 °C | 248 MPa Show Supplier Material materials with Creep strength of 248 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition | |

750.0 °C | 125 MPa Show Supplier Material materials with Creep strength of 125 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition | |

800.0 °C | 36 MPa Show Supplier Material materials with Creep strength of 36 MPa | Rm/10⁴ h according to DIN EN 10302 of the solution annealed and age hardened condition | |

Elastic modulus | 20.0 °C | 204 GPa Show Supplier Material materials with Elastic modulus of 204 GPa | |

100.0 °C | 199 GPa Show Supplier Material materials with Elastic modulus of 199 GPa | ||

200.0 °C | 193 GPa Show Supplier Material materials with Elastic modulus of 193 GPa | ||

300.0 °C | 187 GPa Show Supplier Material materials with Elastic modulus of 187 GPa | ||

400.0 °C | 180 GPa Show Supplier Material materials with Elastic modulus of 180 GPa | ||

500.0 °C | 173 GPa Show Supplier Material materials with Elastic modulus of 173 GPa | ||

600.0 °C | 166 GPa Show Supplier Material materials with Elastic modulus of 166 GPa | ||

700.0 °C | 158 GPa Show Supplier Material materials with Elastic modulus of 158 GPa | ||

800.0 °C | 150 GPa Show Supplier Material materials with Elastic modulus of 150 GPa | ||

900.0 °C | 143 GPa Show Supplier Material materials with Elastic modulus of 143 GPa | ||

1000.0 °C | 134 GPa Show Supplier Material materials with Elastic modulus of 134 GPa | ||

1100.0 °C | 126 GPa Show Supplier Material materials with Elastic modulus of 126 GPa | ||

1200.0 °C | 122 GPa Show Supplier Material materials with Elastic modulus of 122 GPa | ||

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Elongation | 23.0 °C | 12 % Show Supplier Material materials with Elongation of 12 % | for 20-800°C |

Hardness, Brinell | 23.0 °C | 277 [-] Show Supplier Material materials with Hardness, Brinell of 277 [-] | min., typical mechanical property for rod and bar in the solution annealed condition, >331, rod, bar, solution-annealed and age hardened condition |

Reduction of area | 23.0 °C | 15 % Show Supplier Material materials with Reduction of area of 15 % | for 20 to 800°C |

Tensile strength | 20.0 °C | 1280 MPa Show Supplier Material materials with Tensile strength of 1280 MPa | Typical mechanical properties |

100.0 °C | 1280 MPa Show Supplier Material materials with Tensile strength of 1280 MPa | Typical mechanical properties | |

200.0 °C | 1250 MPa Show Supplier Material materials with Tensile strength of 1250 MPa | Typical mechanical properties | |

300.0 °C | 1220 MPa Show Supplier Material materials with Tensile strength of 1220 MPa | Typical mechanical properties | |

400.0 °C | 1180 MPa Show Supplier Material materials with Tensile strength of 1180 MPa | Typical mechanical properties | |

500.0 °C | 1150 MPa Show Supplier Material materials with Tensile strength of 1150 MPa | Typical mechanical properties | |

600.0 °C | 1060 MPa Show Supplier Material materials with Tensile strength of 1060 MPa | Typical mechanical properties | |

650.0 °C | 1000 MPa Show Supplier Material materials with Tensile strength of 1000 MPa | Typical mechanical properties | |

700.0 °C | 1040 MPa Show Supplier Material materials with Tensile strength of 1040 MPa | Typical mechanical properties | |

750.0 °C | 880 MPa Show Supplier Material materials with Tensile strength of 880 MPa | Typical mechanical properties | |

800.0 °C | 780 MPa Show Supplier Material materials with Tensile strength of 780 MPa | Typical mechanical properties | |

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Yield strength Rp0.2 | 20.0 °C | 1030 MPa Show Supplier Material materials with Yield strength Rp0.2 of 1030 MPa | Typical mechanical properties |

100.0 °C | 1060 MPa Show Supplier Material materials with Yield strength Rp0.2 of 1060 MPa | Typical mechanical properties | |

200.0 °C | 1040 MPa Show Supplier Material materials with Yield strength Rp0.2 of 1040 MPa | Typical mechanical properties | |

300.0 °C | 1020 MPa Show Supplier Material materials with Yield strength Rp0.2 of 1020 MPa | Typical mechanical properties | |

400.0 °C | 1000 MPa Show Supplier Material materials with Yield strength Rp0.2 of 1000 MPa | Typical mechanical properties | |

500.0 °C | 980 MPa Show Supplier Material materials with Yield strength Rp0.2 of 980 MPa | Typical mechanical properties | |

600.0 °C | 950 MPa Show Supplier Material materials with Yield strength Rp0.2 of 950 MPa | Typical mechanical properties | |

650.0 °C | 860 MPa Show Supplier Material materials with Yield strength Rp0.2 of 860 MPa | Typical mechanical properties | |

700.0 °C | 870 MPa Show Supplier Material materials with Yield strength Rp0.2 of 870 MPa | Typical mechanical properties | |

750.0 °C | 760 MPa Show Supplier Material materials with Yield strength Rp0.2 of 760 MPa | Typical mechanical properties | |

800.0 °C | 640 MPa Show Supplier Material materials with Yield strength Rp0.2 of 640 MPa | Typical mechanical properties | |

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Thermal

Property | Temperature | Value |
---|---|---|

Coefficient of thermal expansion | 20.0 °C | 1.41E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.41E-5 1/K |

100.0 °C | 1.41E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.41E-5 1/K | |

200.0 °C | 1.41E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.41E-5 1/K | |

300.0 °C | 1.42E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.42E-5 1/K | |

400.0 °C | 1.44E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.44E-5 1/K | |

500.0 °C | 1.48E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.48E-5 1/K | |

600.0 °C | 1.53E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.53E-5 1/K | |

700.0 °C | 1.64E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.64E-5 1/K | |

800.0 °C | 1.7E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.7E-5 1/K | |

900.0 °C | 1.74E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.74E-5 1/K | |

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Melting point | 1257 - 1342 °C Show Supplier Material materials with Melting point of 1257 - 1342 °C | |

Specific heat capacity | 20.0 °C | 460 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 460 J/(kg·K) |

100.0 °C | 458 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 458 J/(kg·K) | |

200.0 °C | 468 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 468 J/(kg·K) | |

300.0 °C | 485 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 485 J/(kg·K) | |

400.0 °C | 501 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 501 J/(kg·K) | |

500.0 °C | 514 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 514 J/(kg·K) | |

600.0 °C | 533 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 533 J/(kg·K) | |

700.0 °C | 604 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 604 J/(kg·K) | |

800.0 °C | 615 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 615 J/(kg·K) | |

900.0 °C | 626 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 626 J/(kg·K) | |

1000.0 °C | 637 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 637 J/(kg·K) | |

1100.0 °C | 635 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 635 J/(kg·K) | |

1200.0 °C | 658 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 658 J/(kg·K) | |

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Thermal conductivity | 20.0 °C | 11.5 W/(m·K) Show Supplier Material materials with Thermal conductivity of 11.5 W/(m·K) |

100.0 °C | 12.1 W/(m·K) Show Supplier Material materials with Thermal conductivity of 12.1 W/(m·K) | |

200.0 °C | 13.5 W/(m·K) Show Supplier Material materials with Thermal conductivity of 13.5 W/(m·K) | |

300.0 °C | 15.2 W/(m·K) Show Supplier Material materials with Thermal conductivity of 15.2 W/(m·K) | |

400.0 °C | 17.1 W/(m·K) Show Supplier Material materials with Thermal conductivity of 17.1 W/(m·K) | |

500.0 °C | 18.8 W/(m·K) Show Supplier Material materials with Thermal conductivity of 18.8 W/(m·K) | |

600.0 °C | 20.6 W/(m·K) Show Supplier Material materials with Thermal conductivity of 20.6 W/(m·K) | |

700.0 °C | 24.1 W/(m·K) Show Supplier Material materials with Thermal conductivity of 24.1 W/(m·K) | |

800.0 °C | 24.2 W/(m·K) Show Supplier Material materials with Thermal conductivity of 24.2 W/(m·K) | |

900.0 °C | 25 W/(m·K) Show Supplier Material materials with Thermal conductivity of 25 W/(m·K) | |

1000.0 °C | 25.8 W/(m·K) Show Supplier Material materials with Thermal conductivity of 25.8 W/(m·K) | |

1100.0 °C | 26.6 W/(m·K) Show Supplier Material materials with Thermal conductivity of 26.6 W/(m·K) | |

1200.0 °C | 28.7 W/(m·K) Show Supplier Material materials with Thermal conductivity of 28.7 W/(m·K) | |

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Electrical

Property | Temperature | Value |
---|---|---|

Electrical resistivity | 20.0 °C | 1.18E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.18E-6 Ω·m |

100.0 °C | 1.2E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.2E-6 Ω·m | |

200.0 °C | 1.23E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.23E-6 Ω·m | |

300.0 °C | 1.25E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.25E-6 Ω·m | |

400.0 °C | 1.27E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.27E-6 Ω·m | |

500.0 °C | 1.28E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.28E-6 Ω·m | |

600.0 °C | 1.3E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.3E-6 Ω·m | |

700.0 °C | 1.31E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.31E-6 Ω·m | |

800.0 °C | 1.32E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.32E-6 Ω·m | |

900.0 °C | 1.33E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.33E-6 Ω·m | |

1000.0 °C | 1.34E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.34E-6 Ω·m | |

1100.0 °C | 1.18E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.18E-6 Ω·m | |

1200.0 °C | 1.2E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.2E-6 Ω·m | |

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Magnetic

Property | Temperature | Value | Comment |
---|---|---|---|

Curie temperature | -195 °C Show Supplier Material materials with Curie temperature of -195 °C | Typical material property in solution annealed condition, Solution annealed and age hardened: -112 °C | |

Relative magnetic permeability | 23.0 °C | 1 [-] Show Supplier Material materials with Relative magnetic permeability of 1 [-] | max. |

Chemical properties

Property | Value | Comment | |
---|---|---|---|

Aluminium | 0.2 - 0.8 % Show Supplier Material materials with Aluminium of 0.2 - 0.8 % | ||

Bismuth | 3E-5 % Show Supplier Material materials with Bismuth of 3E-5 % | max. | |

Boron | 6E-3 % Show Supplier Material materials with Boron of 6E-3 % | max. | |

Carbon | 0.08 % Show Supplier Material materials with Carbon of 0.08 % | max. | |

Chromium | 17 - 21 % Show Supplier Material materials with Chromium of 17 - 21 % | ||

Cobalt | 1 % Show Supplier Material materials with Cobalt of 1 % | max. | |

Copper | 0.3 % Show Supplier Material materials with Copper of 0.3 % | max. | |

Iron | Balance | ||

Lead | 5E-4 % Show Supplier Material materials with Lead of 5E-4 % | max. | |

Manganese | 0.35 % Show Supplier Material materials with Manganese of 0.35 % | max. | |

Molybdenum | 2.8 - 3.3 % Show Supplier Material materials with Molybdenum of 2.8 - 3.3 % | ||

Nickel | 50 - 55 % Show Supplier Material materials with Nickel of 50 - 55 % | ||

Niobium | 4.75 - 5.5 % Show Supplier Material materials with Niobium of 4.75 - 5.5 % | ||

Phosphorus | 0.02 % Show Supplier Material materials with Phosphorus of 0.02 % | max. | |

Selenium | 3E-4 % Show Supplier Material materials with Selenium of 3E-4 % | max. | |

Silicon | 0.35 % Show Supplier Material materials with Silicon of 0.35 % | max. | |

Sulfur | 0.015 % Show Supplier Material materials with Sulfur of 0.015 % | max. | |

Tantalum | 0.05 % Show Supplier Material materials with Tantalum of 0.05 % | max | |

Titanium | 0.65 - 1.15 % Show Supplier Material materials with Titanium of 0.65 - 1.15 % |

Technological properties

Property | ||
---|---|---|

Application areas | Based on its high-temperature resistance up to 700 °C, its excellent oxidation and corrosion resistance, and its good workability, VDM® Alloy 718 is used in many demanding applications. Originally, it was developed and used for static and rotating components in aircraft turbines such as housings, mounting elements and turbine disks, where tough requirements apply for creep resistance and fatigue behavior, in particular for the rotating applications. Due to its properties, its good workability and efficiency, the material is additionally widely used for static and rotating components in stationary gas turbines, rocket drives and spacecraft, motor vehicle turbo chargers, high-strength screws, springs and mounting elements, and for heat-resistant tools in forgeries, extruders and separating shearers. The variant VDM® Alloy 718 CTP, which is laid out specifically for the requirements of the oil and gas industry, finds increasing uses in drilling equipment and pump shafts. The components used must ensure an efficient and safe oil and gas extraction with increasing drilling hole depth and pressures and temperatures becoming more critical, and withstand the acid gas environment (H₂S, CO₂, chloride) that is prevalent there (see special data sheet VDM® Alloy 718 CTP). | |

Cold Forming | Cold working should take place in the solution-annealed condition. The material has a higher work hardening rate than austenitic stainless steels. This must be taken into account during design and selection of forming tools and equipment and during the planning of the forming processes. | |

Corrosion properties | Based on the high chrome and molybdenum concentrations, VDM® Alloy 718 has a good resistance in many media against abrasive and local corrosion such as pitting. By virtue of its high nickel content, VDM® Alloy 718 also has good resistance against stress corrosion cracking. | |

General machinability | While VDM® Alloy 718 in the solution annealed condition is easier to process and the strain on tools is less, better surface quality is achieved in the hardened condition. The best results in terms of the surface quality of the finished product are achieved by pre-treatment before hardening and by finishing in the hardened condition. As the alloy is more prone to work-hardening than other low alloyed materials, low cutting speeds and appropriate feed rates should be used and the tool should stay engaged at all times. Sufficient chip depths are important to get below the work-hardened surface layer. | |

Heat Treatment | Through various heat treatments, the mechanical properties of VDM® Alloy 718 can be adjusted specifically. In the solution-annealed condition, the material can be processed and worked more easily. In the solution-annealed and age hardened condition, VDM® Alloy 718 has a high mechanical strength. The solution-annealed condition is obtained through a heat treatment in the temperature range from 940 to 1,065°C (1,724 to 1,949°F). Here, for example, annealing by inserting into a pre-heated furnace at a temperature of 980°C (1,796°F) for 1 hour is common. Cooling can be done by placing the workpiece in water or oil or also in open air. The hardening takes place by annealing in the temperature range from 620 to 790°C (1,148 to 1,454°F). A two-stage heat treatment is common here with insertion in a pre-heated furnace at 720°C (1,328°F) for 8 hours, followed by a furnace cool down to 620°C (1,148°F) and repeated holding for 8 hours. Cooling is usually done in open air. | |

Hot forming | The hot working should generally be conducted after the homogenization with subsequent cooling in air. It should be done evenly in order to receive a homogeneous structure and to prevent the formation of a duplex grain structure. | |

Other | VDM® Alloy 718 has an austenitic structure; multiple phases can be precipitated. By means of different heat treatments, graduated mechanical properties of the material can be reached. The excellent mechanical properties of VDM® Alloy 718 result from the γ’’-formation during the precipitation hardening. | |

Welding | It must be ensured that work is carried out using targeted heat application and low heat input. The interpass temperature should not exceed 100°C (212°F). The stringer bead technique is recommended. In principle, checking of welding parameters is necessary. |