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VDM® Alloy 690

Alternative and trade names
Nicrofer 6030, Inconel 690
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Description

VDM® Alloy 690 is a nickel-chromium-iron alloy with approx. 30 % of chromium, which is particularly suitable for use in oxidising media.


VDM® Alloy 690 is characterised by:

  • Very good resistance to fluoride containing hot nitric acid
  • Good resistance to stress corrosion cracking caused by alkalis
  • Excellent resistance to stress corrosion cracking caused by media containing chloride and polythionic acids
  • Excellent resistance to many aggressive aqueous media or in the primary and secondary loops of nuclear reactors
  • Good resistance to oxidation, sulphidation and metal dusting in hot gases
  • Good mechanical properties at room temperature and high temperature, paired with high ductility

Related Standards

Properties

Electrical

Electrical resistivity ρel

1.16E-6 Ω·m at 20 °C

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General

Density ρ

8.2 g/cm³ at 20 °C

Magnetic

Relative magnetic permeability μrel

1.01 [-] at 20 °C

Mechanical

Creep limit Rp,creep

42 MPa at 700 °C

Rp 1.0/10⁴ h measured for solution annealed condition

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Creep strength Rm,creep

56 MPa at 700 °C

Rm/10⁴ h measured in the solution annealed condition

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Elastic modulus E

212 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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Tensile strength Rm

590 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Yield strength Rp0.2 Rp0.2

240 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Thermal

Coefficient of thermal expansion α

1.37E-5 1/K at 100 °C

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Melting point Tm

1390 - 1410 °C

Specific heat capacity cp

496 J/(kg·K) at 100 °C

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Thermal conductivity λ

13.9 W/(m·K) at 100 °C

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Chemical properties

Element

Weight %

Comment

Ni

58 %

Cr

27 - 31 %

Fe

7 - 11 %

Cu

0.5 %

max

Mn

0.5 %

max

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Technological properties

Application areas

Thanks to its excellent resistance to wet and high-temperature corrosion, and its good mechanical properties, VDM® Alloy 690 is suitable for a wide range of applications. Typical applications are: Treatment of radioactive waste, components in boilers and steam generators in pressurised water reactors, production of alkali metal sulphates using Mannheim furnaces, fittings in combustion units for crude oil (oil ash corrosion) and, glass and silicate production.

Corrosion properties

VDM® Alloy 690 is resistant to a wide range of corrosive media and atmospheres. The high chromium content makes the material particularly suitable for strongly oxidising conditions. The high chromium content also confers resistance to high-temperature corrosion in gases having an oxidising and sulphidising effect. Due to its high nickel content, VDM® Alloy 690 is exceptionally resistant to stress corrosion cracking which can occur in the primary water loops of nuclear power stations. The material also shows good resistance in mixtures of nitric and hydrofluoric acid. It demonstrates remarkable behaviour in concentrated (98.5%) sulphuric acid at temperatures of up to 150°C.

General machinability

VDM® Alloy 690 should preferably be machined in the annealed condition. Since the material exhibits a considerable work hardening rate, low cutting speeds should be used and the tool should remain continuously in contact. An adequate cutting depth is important in order to cut below the previously formed work-hardened zone. Optimum heat dissipation through the use of large quantities of suitable, preferably aqueous, lubricants has considerable influence on a stable machining process.

Other

VDM® Alloy 690 has a cubic face-centred structure.

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.