VDM® Alloy 330

Alternative and trade names
Nicrofer 3718, VDM® Alloy 330
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Description

1.4864 (X12NiCrSi36-16) is a nickel-iron-chromium solid-solution alloy with the addition of approximately 2% silicon that shows the following features and properties:


  • Good oxidation and scale resistance
  • Excellent resistance to carburisation and to alternating carburising and oxidising atmospheres
  • Good mechanical properties with high strength at elevated 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

    -100.0 °C

    201 GPa

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    0.0 °C

    196 GPa

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    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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    Elongation A5

    23.0 °C

    30 %

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    for 20 to 800°C

    Hardness, Brinell

    23.0 °C

    210 [-]

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    max.

    Tensile strength

    20.0 °C

    650 MPa

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    100.0 °C

    630 MPa

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    200.0 °C

    615 MPa

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    300.0 °C

    605 MPa

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    400.0 °C

    590 MPa

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    500.0 °C

    555 MPa

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    600.0 °C

    480 MPa

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    700.0 °C

    340 MPa

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    800.0 °C

    210 MPa

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    900.0 °C

    120 MPa

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    1000.0 °C

    80 MPa

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    Yield strength Rp0.2

    20.0 °C

    285 MPa

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    100.0 °C

    265 MPa

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    200.0 °C

    240 MPa

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    300.0 °C

    220 MPa

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    400.0 °C

    210 MPa

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    500.0 °C

    200 MPa

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    600.0 °C

    195 MPa

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    700.0 °C

    175 MPa

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    800.0 °C

    135 MPa

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    900.0 °C

    85 MPa

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    1000.0 °C

    48 MPa

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    Yield strength Rp1.0

    20.0 °C

    310 MPa

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    100.0 °C

    290 MPa

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    200.0 °C

    265 MPa

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    300.0 °C

    250 MPa

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    400.0 °C

    235 MPa

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    500.0 °C

    225 MPa

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    600.0 °C

    215 MPa

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    700.0 °C

    190 MPa

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    800.0 °C

    145 MPa

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    900.0 °C

    100 MPa

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    1000.0 °C

    55 MPa

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    Thermal

    PropertyTemperatureValue

    Coefficient of thermal expansion

    -100.0 °C

    1.36E-5 1/K

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    100.0 °C

    1.51E-5 1/K

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    200.0 °C

    1.57E-5 1/K

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    300.0 °C

    1.62E-5 1/K

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    400.0 °C

    1.66E-5 1/K

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    500.0 °C

    1.7E-5 1/K

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    600.0 °C

    1.74E-5 1/K

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    700.0 °C

    1.77E-5 1/K

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    800.0 °C

    1.8E-5 1/K

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    900.0 °C

    1.83E-5 1/K

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    1000.0 °C

    1.86E-5 1/K

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    Melting point

    1330 - 1400 °C

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    Specific heat capacity

    -100.0 °C

    394 J/(kg·K)

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    0.0 °C

    467 J/(kg·K)

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    20.0 °C

    472 J/(kg·K)

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    100.0 °C

    501 J/(kg·K)

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    200.0 °C

    525 J/(kg·K)

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    300.0 °C

    532 J/(kg·K)

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    400.0 °C

    555 J/(kg·K)

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    500.0 °C

    582 J/(kg·K)

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    600.0 °C

    604 J/(kg·K)

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    700.0 °C

    610 J/(kg·K)

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    800.0 °C

    609 J/(kg·K)

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    900.0 °C

    615 J/(kg·K)

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    1000.0 °C

    641 J/(kg·K)

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    Thermal conductivity

    20.0 °C

    11.4 W/(m·K)

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    100.0 °C

    12.8 W/(m·K)

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    200.0 °C

    14.6 W/(m·K)

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    300.0 °C

    16.3 W/(m·K)

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    400.0 °C

    17.9 W/(m·K)

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    500.0 °C

    19.5 W/(m·K)

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    600.0 °C

    21 W/(m·K)

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    700.0 °C

    22.6 W/(m·K)

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    800.0 °C

    24.1 W/(m·K)

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    900.0 °C

    25.6 W/(m·K)

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    1000.0 °C

    27 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    20.0 °C

    1.04E-6 Ω·m

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    100.0 °C

    1.07E-6 Ω·m

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    200.0 °C

    1.11E-6 Ω·m

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    300.0 °C

    1.14E-6 Ω·m

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    400.0 °C

    1.17E-6 Ω·m

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    500.0 °C

    1.19E-6 Ω·m

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    600.0 °C

    1.22E-6 Ω·m

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    700.0 °C

    1.23E-6 Ω·m

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    800.0 °C

    1.25E-6 Ω·m

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    900.0 °C

    1.27E-6 Ω·m

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    1000.0 °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

    Carbon

    0.15 %

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    max.

    Chromium

    15 - 17 %

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    Iron

    Balance

    Manganese

    2 %

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    max.

    Nickel

    34 - 37 %

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    Phosphorus

    0.04 %

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    max.

    Silicon

    1 - 2 %

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    Sulfur

    0.02 %

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    max.

    Titanium

    0.2 %

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    max.

    Technological properties

    Property
    Application areas

    Nicrofer 3718 finds wide application in high-temperature processes: fans operating at high temperatures in carburising furnaces resisting carburisation, boxes and baskets used in carburising resisting carburisation and showing weight savings when compared with cast boxes, hangers, hooks and conveyor chains used to carry vitreous-enamelled components during firing resisting oxide spalling so that oxide does not fall on the enamel, combustion tubes resisting oxidation to carburisation and alternating oxidising and carburising conditions, jigs and fixtures used in furnace brazing and wire mesh belts to carry components in heat-treatment processes, thermocouple sheaths resisting carburisation and nitriding, flare-stack tips resisting alternating conditions, components handling cracked ammonia.

    Cold Forming

    Cold working should be carried out on annealed material. Nicrofer 3718 has a similar work-hardening rate compared to austenitic stainless steel and the forming equipment must be adapted accordingly. When cold working is performed, interstage annealing may become necessary. After cold reduction of more than 15%, final annealing is required before use, in so far as the creep-strength is important. Bending property and formability is given even with oxidised sheets. Nevertheless the bending radius should be 3 times sheet thickness.

    Corrosion properties

    The nickel-chromium-iron alloy Nicrofer 3718 containing about 2% silicon is a general-purpose heat-resisting material. It has good oxidation resistance up to about 1000°C, particularly under cyclic conditions of heating and cooling. It also has excellent resistance to carburisation and is widely used in industry under such conditions. Its resistance to nitrogen-containing atmospheres where oxygen content is low makes them suitable for environments such as cracked ammonia.

    General machinability

    Nicrofer 3718 should be machined in the annealed condition. As the alloy is susceptible to work-hardening, a low cutting speed should be used and tools should be engaged at all times. Heavy feeds are important in betting below the work-hardened 'skin'.

    Heat Treatment

    Annealing should be carried out in the temperature range 1020 to 1120°C (1870 to 2050°F). Water quenching is essential for maximum creep resistance. During any heating operation, the precautions outlined earlier regarding cleanliness must be observed.

    Hot forming

    Nicrofer 3718 may be hot-worked in the range 1150 to 950 °C (2100 to 1740 °F). Cooling should be by water quenching or as fast as possible. Annealing is recommended after hot working to ensure maximum corrosion resistance and optimum structure. The material may be charged into the furnace at maximum working temperature.

    Other

    Nicrofer 3718 is a solid solution alloy with small amounts of precipitated titanium nitride and carbide as well as carbonitrides in the austenitic matrix.

    Welding

    Nicrofer 3718 can be welded by GTAW, plasma arc and SMAW processes. Prior to welding, material should be in the annealed condition, clean and free from scale, grease, marking paints etc. A zone approximately 25 mm (1 in) wide on each side of the joint should be ground to bright metal. Interpass temperature should not exceed 150°C (300°F). Neither pre- nor post-weld heat treatment is required.