VDM® Alloy 601

Alternative and trade names
Nicrofer 6023 H, Inconel 601


VDM® Alloy 601 is a nickel-chromium-iron alloy with additions of aluminum and titanium.

VDM® Alloy 601 is characterized by:

  • Outstanding resistance to oxidation at high temperatures
  • Good resistance to carburizing conditions
  • Good resistance in oxidizing, sulfuric atmospheres
  • Good mechanical properties at both room temperature and elevated temperatures
  • Good resistance to stress-corrosion cracking

VDM® Alloy 601 is specifically recommended for service above 550 °C because of its higher creep-rupture properties resulting from its controlled carbon content and coarse grain size.

Related Standards



Density ρ

8.05 g/cm³ at 20 °C


Creep strength Rm,creep

205 MPa at 600 °C

Rm/10⁴ h measured in the solution annealed condition

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Elastic modulus E

207 GPa at 20 °C

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Elongation A

30 % at 20 °C

Typical mechanical properties in the solution annealed condition

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Hardness, Brinell HB

220 [-] at 20 °C

Tensile strength Rm

620 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Yield strength Rp0.2 Rp0.2

270 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Coefficient of thermal expansion α

1.446E-5 1/K at 100 °C

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Melting point Tm

1330 - 1370 °C

Specific heat capacity cp

472 J/(kg·K) at 20 °C

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Thermal conductivity λ

11.3 W/(m·K) at 20 °C

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Thermal diffusivity αdiff

2.97 mm²/s at 20 °C

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Electrical resistivity ρel

1.22E-6 Ω·m at 20 °C

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Curie temperature Tc

-196 °C

Relative magnetic permeability μrel

1.01 [-] at 20 °C

Chemical properties


Weight %



58 - 63 %


21 - 25 %


18 %



1 - 1.7 %



1 %



Technological properties

Application areas

VDM® Alloy 601 has found a wide variety of applications in high temperature areas in furnace construction, the chemical industry, in environmental protection facilities, in the automobile industry and in power plants. Typical application fields include: rays, baskets and fixtures for heat treatment plants, e. g. in carburizing or carbonitriding environments, refractory anchors, strand-annealing and radiant heater tubes, high-velocity gas burners, wire mesh belts in industrial furnaces, isolating inserts in ammonia crackers and catalyst support grids in nitric acid production, high temperature components in automotive parts, e. g. manifolds, glow plug tubes or sensor caps, combustion chambers in solid waste incinerators, tube supports and ash-handling components, components in exhaust gas systems, oxygen preheaters.

Corrosion properties

According to DIN EN 10095 VDM® Alloy 601 is termed a heat resistant alloy on account of its excellent resistance above 550 °C against hot gases and combustion products, as well as against molten salt, while at the same time exhibiting good mechanical short-time and long-term properties. Even under severe conditions, such as under cyclic heating and cooling, VDM® Alloy 601 retains a tightly adherent oxide layer which is very resistant to spalling. According to DIN EN 10095, the maximum operating temperature in air is 1200 °C, while the loss of weight from scaling is not higher than 1 g/m² h on average. Resistance to carburization is good. VDM® Alloy 601 has also shown good resistance in (carbo) nitriding conditions, if a sufficiently high oxygen partial pressure is present.

General machinability

VDM® Alloy 601 should be machined in the solution annealed condition. As the alloy is 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.


VDM® Alloy 601 has a face-centered cubic lattice. The good mechanical properties are determined by the precipitation of carbides below 1150 °C. Below 800 °C, additional γ’ precipitations may occur.

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.