VDM® Alloy 800 HP

Alternative and trade names
Nicrofer 3220 HP, Incoloy 800HT, VDM® Alloy 800 HP
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Description

1.4959 (X8NiCrAlTi32-218) is an austenitic nickel-ironchromium alloy with increased content of (Al + Ti), compared to VDM® Alloy 800 H. A special solution annealing results in a grain sizes ≥90 µm (ASTM No. 4) and highest creep rupture strength above 700°C (1,290°F) due to titanium carbide precipitation. Below 700°C (1,290°F), γ´ precipitates combined with a loss of ductility. It shows the following features and properties:


  • Excellent creep rupture strength at temperatures above 700°C
  • Good resistance to reducing, oxidizing and nitriding atmospheres and to atmospheres which alternate between reducing and oxidizing conditions
  • Metallurgical stability in long-term use at high temperatures
  • Equivalent Materials

    This material data has been provided by VDM Metals.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    Properties

    General

    PropertyTemperatureValue

    Density

    23.0 °C

    8 g/cm³

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    Mechanical

    PropertyTemperatureValueComment

    Elastic modulus

    20.0 °C

    194 GPa

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    100.0 °C

    189 GPa

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    200.0 °C

    183 GPa

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    300.0 °C

    177 GPa

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    400.0 °C

    170 GPa

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    500.0 °C

    163 GPa

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    600.0 °C

    156 GPa

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    700.0 °C

    149 GPa

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    800.0 °C

    141 GPa

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    900.0 °C

    134 GPa

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    1000.0 °C

    127 GPa

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    1100.0 °C

    120 GPa

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    1200.0 °C

    113 GPa

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    Elongation

    23.0 °C

    35 %

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    Typical mechanical properties

    Elongation, transverse

    23.0 °C

    30 %

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    Impact strength, Charpy notched

    23.0 °C

    1500 kJ/m²

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    Tensile strength

    20.0 °C

    450 - 700 MPa

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    Typical mechanical properties

    100.0 °C

    425 MPa

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    Typical mechanical properties

    200.0 °C

    400 MPa

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    Typical mechanical properties

    300.0 °C

    390 MPa

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    Typical mechanical properties

    400.0 °C

    380 MPa

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    Typical mechanical properties

    500.0 °C

    360 MPa

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    Typical mechanical properties

    600.0 °C

    300 MPa

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    Typical mechanical properties

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    Yield strength Rp0.2

    20.0 °C

    170 MPa

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    Typical mechanical properties

    100.0 °C

    140 MPa

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    Typical mechanical properties

    200.0 °C

    115 MPa

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    Typical mechanical properties

    300.0 °C

    95 MPa

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    Typical mechanical properties

    400.0 °C

    85 MPa

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    Typical mechanical properties

    500.0 °C

    80 MPa

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    Typical mechanical properties

    600.0 °C

    75 MPa

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    Typical mechanical properties

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    impactTransVNotch

    23.0 °C

    1000 kJ/m²

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    Thermal

    PropertyTemperatureValue

    Coefficient of thermal expansion

    20.0 °C

    1.4E-5 1/K

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    100.0 °C

    1.41E-5 1/K

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    200.0 °C

    1.46E-5 1/K

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    300.0 °C

    1.49E-5 1/K

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    400.0 °C

    1.52E-5 1/K

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    500.0 °C

    1.55E-5 1/K

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    600.0 °C

    1.59E-5 1/K

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    700.0 °C

    1.64E-5 1/K

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    800.0 °C

    1.7E-5 1/K

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    900.0 °C

    1.74E-5 1/K

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    1000.0 °C

    1.78E-5 1/K

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    1100.0 °C

    1.83E-5 1/K

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    1200.0 °C

    1.87E-5 1/K

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    Melting point

    1350 - 1400 °C

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    Specific heat capacity

    20.0 °C

    443 J/(kg·K)

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    100.0 °C

    457 J/(kg·K)

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    200.0 °C

    474 J/(kg·K)

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    300.0 °C

    492 J/(kg·K)

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    400.0 °C

    512 J/(kg·K)

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    500.0 °C

    548 J/(kg·K)

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    600.0 °C

    578 J/(kg·K)

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    700.0 °C

    588 J/(kg·K)

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    800.0 °C

    598 J/(kg·K)

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    900.0 °C

    602 J/(kg·K)

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    1000.0 °C

    613 J/(kg·K)

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    1100.0 °C

    628 J/(kg·K)

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    1200.0 °C

    634 J/(kg·K)

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    Thermal conductivity

    20.0 °C

    12.4 W/(m·K)

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    100.0 °C

    13.7 W/(m·K)

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    200.0 °C

    15.3 W/(m·K)

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    300.0 °C

    17 W/(m·K)

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    400.0 °C

    18.9 W/(m·K)

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    500.0 °C

    21.4 W/(m·K)

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    600.0 °C

    23.6 W/(m·K)

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    700.0 °C

    24.7 W/(m·K)

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    800.0 °C

    25.8 W/(m·K)

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    900.0 °C

    26.7 W/(m·K)

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    1000.0 °C

    28 W/(m·K)

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    1100.0 °C

    29.6 W/(m·K)

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    1200.0 °C

    30.6 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    20.0 °C

    1.01E-6 Ω·m

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    100.0 °C

    1.04E-6 Ω·m

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    200.0 °C

    1.08E-6 Ω·m

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    300.0 °C

    1.12E-6 Ω·m

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    400.0 °C

    1.15E-6 Ω·m

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    500.0 °C

    1.18E-6 Ω·m

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    600.0 °C

    1.2E-6 Ω·m

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    700.0 °C

    1.22E-6 Ω·m

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    800.0 °C

    1.24E-6 Ω·m

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    900.0 °C

    1.26E-6 Ω·m

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    1000.0 °C

    1.27E-6 Ω·m

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    1100.0 °C

    1.28E-6 Ω·m

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    1200.0 °C

    1.29E-6 Ω·m

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    Magnetic

    PropertyTemperatureValue

    Relative magnetic permeability

    23.0 °C

    1.01 [-]

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    Chemical properties

    PropertyValueComment

    Aluminium

    0.2 - 0.6 %

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    Carbon

    0.06 - 0.1 %

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    Chromium

    19 - 22 %

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    Copper

    0.5 %

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    max.

    Iron

    43 - 50 %

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    Manganese

    0.5 - 1 %

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    Nickel

    30 - 32 %

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    Other

    0.85 - 1.2 %

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    Al+Ti

    Phosphorus

    0.02 %

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    max.

    Silicon

    0.2 - 0.6 %

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    Sulfur

    0.01 %

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    max.

    Titanium

    0.3 - 0.6 %

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    Technological properties

    Property
    Application areas

    VDM® Alloy 800 HP has a wide range of applications in areas of elevated temperatures in furnace construction, in the chemical industry, in environmental protection equipment, in the automotive industry and in power plants. Typical applications include furnace muffles, containers, bins, holders in various heat treatment plants and burner components. Because of its resistance to carburization and nitriding, the alloy is furthermore used in the areas of: steam and hydrocarbon reformers, ethylene pyrolysis, Equipment for acetic anhydride and ketone production.

    Cold Forming

    Cold working should be carried out on annealed material. VDM® Alloy 800 HP 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. Intermediate annealing may be necessary at high degrees of cold working deformation. After cold working with more than 10 % deformation the material should be solution annealed.

    Corrosion properties

    The high nickel and chromium contents in VDM® Alloy 800 HP ensure excellent resistance to oxidation. The alloy is also highly resistant to carburizing, nitriding and oxidation in sulphurous atmospheres. The protective oxide layer is adherent under static and cyclic thermal stress. The material is particularly resistant to carburization if a thin oxide film was formed by pre-oxidation. The resistance to hydrogen embrittlement of VDM® Alloy 800 HP is excellent, so that the alloys can be used in the production of hydrogen and steam and hydrocarbon reformers.

    General machinability

    VDM® Alloy 800 HP should be machined in the solution annealed condition. As the alloys are prone to work-hardening, low cutting speeds and appropriate feed rates should be used and the tool should be engaged at all times. Sufficient chip depths are important to get below the work-hardened surface layer. Due to the high temperature loads on the cutting edge during machining, large amounts of cooling lubricants should be used. Water-based emulsions, as they are also used for construction and stainless steels, are suitable for instance.

    Heat Treatment

    Solution heat treatment should be carried out at 1,150-1,200°C. Water quenching should be carried out rapidly if the material should be further fabricated after solution annealing. Workpieces of less than 3 mm (0.12 in) thickness can be cooled down using air nozzles. If the solution annealing is the last fabrication step, the material can be cooled down more slowly in order to avoid material distortion. Solution annealed VDM® Alloy 800 HP is prone to stress relaxation cracks in the temperature range of 550 and 750°C and should therefore be subjected to stabilizing annealing when a continuous operation (> 100 h) in the mentioned temperature range is intended. The stabilizing annealing temperature depends on the welding material and should be determined with VDM Metals’ Technical Customer Support. If possible, the stabilizing annealing should be carried out when all welding work is completed, because the heat-affected zones of the welds are particularly susceptible to cracking. Heating rates are critical and should not be too high to avoid disortion.

    Hot forming

    VDM® Alloy 800 HP may be hot-worked in the temperature range 1,200 to 900°C (2,192 to 1,650°F) with subsequent rapid cooling down in water or by using air. In particular the temperature range from 760 to 540 °C (1,400 to 1,004°F) must be passed quickly. Hot bending is carried out at 1,150 to 1,000°C (2,102 to 1,832°F). The furnace should be heated up to maximum working temperature (1,200°C/2,192°F) before workpieces are inserted into the preheated furnace. The holding time is about 60 minutes per 100 mm thickness. After the hot forming a solution heat treatment is recommended in order to achieve optimum creep strength.

    Other

    VDM® Alloy 800 HP is an austenitic solid solution alloy which precipitates carbides and γ’ phase during high-temperature ageing.

    Welding

    For welding, VDM® Alloy 800 HP should be in the annealed condition and be free from scale, grease and markings. VDM® Alloy 800 H can be welded using the following procedures: GTAW (TIG), GTAW (TIG) hot wire, plasma, SMAW (MMA), GMAW (MIG/MAG) and submerged arc welding.