VDM® Alloy 330

Alternative and trade names
Nicrofer 3718


Nicrofer 3718 is a nickel-iron-chromium solid-solution alloy with the addition of approximately 2% silicon.

Nicrofer 3718 is characterized by:

  • 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

Related Standards

Equivalent Materials



Electrical resistivity ρel

1.04E-6 Ω·m at 20 °C

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Density ρ

8 g/cm³ at 20 °C


Relative magnetic permeability μrel

1.01 [-] at 20 °C


Elastic modulus E

201 GPa at -100 °C

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Elongation A5 A5

30 % at 20 °C

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Tensile strength Rm

650 MPa at 20 °C

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Yield strength Rp0.2 Rp0.2

285 MPa at 20 °C

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Yield strength Rp1.0 Rp1.0

310 MPa at 20 °C

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Coefficient of thermal expansion α

1.36E-5 1/K at -100 °C

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Melting point Tm

1330 - 1400 °C

Specific heat capacity cp

394 J/(kg·K) at -100 °C

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Thermal conductivity λ

11.4 W/(m·K) at 20 °C

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Chemical properties


Weight %






34 - 37 %


15 - 17 %


2 %



1 - 2 %


Technological properties

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.

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'.

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.