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VDM® Alloy 600 H

Alternative and trade names
Nicrofer 7216 H, Inconel 600
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Description

Nicrofer® 7216 H is a nickel-chromium-iron alloy, characterized by:

  • Good resistance to oxidation, carburization and nitridation
  • Good resistance to stress corrosion cracking at both room and elevated temperatures
  • Good resistance to dry chlorine and hydrogen chloride
  • Good mechanical properties at sub-zero, room and elevated temperatures.


Nicrofer® 7216 H is recommended for service above 700 °C because of its higher creep-rupture properties, obtained via controlled carbon content and, except for strip products, coarse grain size.

Related Standards

Properties

Electrical

Electrical resistivity ρel

1.03E-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

1.05 [-] at 20 °C

Mechanical

Creep limit Rp,creep

153 MPa at 500 °C

Rp 1.0/10⁴ h measured for solution annealed at 1120 °C.

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Creep strength Rm,creep

297 MPa at 500 °C

Rm/10⁴ h measured in the solution annealed (1120°C) condition

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Elastic modulus E

214 GPa at 20 °C

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Elongation A5 A5

35 % at 20 °C

Typical mechanical property in the solution annealed condition

Hardness, Brinell HB

185 [-] at 20 °C

Typical mechanical property in the solution annealed condition

Tensile strength Rm

500 MPa at 20 °C

Typical mechanical properties in the solution annealed condition

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Yield strength Rp0.2 Rp0.2

180 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

1370 - 1425 °C

Specific heat capacity cp

455 J/(kg·K) at 20 °C

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Thermal conductivity λ

14.8 W/(m·K) at 20 °C

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Chemical properties

Element

Weight %

Comment

Ni

72 %

Cr

14 - 17 %

Fe

6 - 10 %

Mn

1 %

max

Si

0.5 %

max

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Technological properties

Application areas

Thermocouple sheathing in aggressive atmospheres, vinyl chloride monomer production (resistance to chlorine, hydrogen chloride, oxidation and carburization), conversion of uranium oxide to hexafluoride (resistance to attack by hydrogen fluoride, production and use of caustic alkalis, particularly in the presence of sulphur compounds), production of titanium dioxide by the chlorine route, production of organic and inorganic chlorinated and fluorinated compounds (resistance to attack by chlorine and fluorine), nuclear reactor components, heat treatment furnace retorts, furnace belts and components, particularly with carburizing or nitriding atmospheres, catalyst regenerators in petrochemical production.

Corrosion properties

Nicrofer 7216 H is resistant to a wide range of corrosive media. Due to the chromium content the alloy possesses better corrosion resistance than Nickel 99.2 (alloy 200) and LC-Nickel 99.2 (alloy 201) under oxidizing conditions. At the same time, the high nickel content results in good corrosion resistance under reducing conditions and in alkaline solutions and leads to virtual immunity to chloride-ion stress-corrosion cracking. Nicrofer 7216 show moderate resistance to mineral acids and good resistance to acetic, formic, stearic and other organic acids. Excellent resistance is shown in high purity water, as used in the primary and secondary circuits of some nuclear reactors. Nicrofer 7216 is particularly resistant to attack by dry chlorine or hydrogen chloride, even at temperatures up to 650 °C. At high temperatures in air the soft-annealed and solution annealed alloy shows good resistance to oxide scaling and has high strength. The alloy also resists ammonia bearing atmospheres, as well as nitrogen and carburizing gases. Under alternating oxidizing and reducing conditions the alloy may suffer from selective oxidation (green rot).

General machinability

Nicrofer 7216 H should preferably be machined in the heat-treated condition. As the alloy is prone to work-hardening, only low cutting speeds should be used and the tool should be engaged at all time. An adequate depth of cut is important in order to cut below the previously formed work-hardened zone.

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.