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VDM Metals

VDM® Alloy 800 H

Alternative and trade names
Nicrofer 3220 H, Incoloy 800H
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Description

VDM® Alloy 800 is an austenitic, heat resistant iron-nickel-chromium alloy with controlled levels of carbon, aluminum and titanium. The analysis of VDM® Alloy 800 H is identical to that of VDM® Alloy 800. A special solution annealing results in grain sizes > 90 µm (ASTM No. 4), which increases the creep rupture strength above 600 °C significantly. VDM® Alloy 800 is characterized by: good creep rupture strength at temperatures above 600 °C, good resistance in oxidizing, nitriding and carburizing conditions, metallurgical stability in long-term use at high temperatures.

Primary standard name

Properties

Electrical

Electrical resistivity ρel

1.0E-6 Ω·m at 20 °C

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General

Density ρ

8.4 g/cm³ at 20 °C

Magnetic

Relative magnetic permeability μrel

1.01 [-] at 20 °C

Mechanical

Elastic modulus E

194 GPa at 20 °C

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Elongation A

35 % at 20 °C

Typical mechanical property in the solution annealed condition

Impact strength, Charpy notched Ivnot

2000 kJ/m²

Tensile strength Rm

450 - 700 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

Yield strength Rp0.2 Rp0.2

170 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Thermal

Coefficient of thermal expansion α

1.4E-5 1/K at 100 °C

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Melting point Tm

1350 - 1400 °C

Specific heat capacity cp

443 J/(kg·K) at 20 °C

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Thermal conductivity λ

12.4 W/(m·K) at 20 °C

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Chemical properties

Element

Weight %

Comment

Fe

43 - 50 %

Ni

30 - 32 %

Cr

19 - 21 %

Other

0.7 %

Al+Ti, max

Mn

0.5 - 1 %

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Technological properties

Application areas

VDM® Alloy 800 H 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/ hydrocarbon reformers, ethylene pyrolysis, Equipment for acetic anhydride and ketone production.

Corrosion properties

The high nickel and chromium contents in VDM® Alloy 800 H 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 H is excellent, so that the alloys can be used in the production of hydrogen and steam/hydrocarbon reformers.

Machinability

VDM® Alloy 800 H 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.

Other

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

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.