600

600

Inconel Alloy 600 is a nickel-based alloy with excellent carburization, and good oxidation resistance at elevated temperatures. The alloy has long been used in the heat treating industry for many of the same applications as RA330®. Alloy 600 has useful resistance to dry Cl2 and HCl gases at moderately elevated temperatures. Alloy 600 is not suggested for use at red heat when sulfur is present due to elevated nickel quantities.

Grades 200 and 201 nickel are normally preferred for handling concentrated, high temperature caustic. However, when sulfur compounds are present as well, or for ammonium hydroxide service, 600 alloy is suggested. 600 alloy is subject to stress corrosion cracking in hot, concentrated caustic alkalies. To avoid stress corrosion cracking, the 600 alloy fabrication should be fully stress relieved prior to use. A minimum treatment of 1650°F for 1 hour is suggested, but 1800-1850°F for 1 hour preferred.

Chemistry

 NiCrCMnCuSiSFe
MIN 72.00 14.00 -- -- -- -- -- 6.00
MAX  -- 17.00 0.15 1.00 0.50 0.50 0.015 10.00

*ASTM specification 0.20 max C.

Specifications

AMS 5540AMS 5665
ASME SB 166ASME SB 167ASME SB 168
ASTM B 166ASTM B 167ASTM B 168
EN 2.4816
UNS N06600
Werkstoff 2.4816

Inventory

600 Plate, 600 Rod Coil, 600 Round Bar, 600 Sheet, 600 Welding Products

Common Trade Names

Alloy 600, Inconel® 600, Nickel 600

Features

  • Virtually immune to chloride ion stress corrosion cracking
  • Good caustic corrosion resistance
  • Resistant to dry Cl2 to about 1000°F
  • Oxidation resistance to 2000°F
  • Carburization resistance

Applications

  • Heat treating muffles and retorts
  • Vacuum furnace fixtures
  • Chlorination equipment to 1000°F
  • Titanium dioxide plants

Physical Properties

Density: 0.304 lb/in3
Melting Point: 2470- 2575°F
Poisson's Ratio: 0.29
Electrical Resistivity: 620 Ohm-circ mil/ft

Temperature, °F 70 1000 1200 1400 1600 2000
Coefficient* of Thermal Expansion, in/in°F x 10-6 - 8.4 8.6 8.7 9.1 9.3
Thermal Conductivity
Btu • ft/ft2 • hr • °F
8.6 13.2 14.3 13.0 16.7 -
Modulus of Elasticity, Dynamic psi x 106 30.0 25.6 24.5 23.6 22.2 20.4

* 70°F to indicated temperature.

Mechanical Properties

Representative Tensile Properties

Temperature,°F 70 1000 1200 1400 1600 1800
Ultimate Tensile Strength, ksi 93 84 65 27.5 15 7.5
0.2% Yield Strength, ksi 37 28.5 26.5 17 9.0 4.0
Charpy Impact V-notch, ft-lbs 45 47 39 46 80 118

Static Corrosion in Molten Caustic Soda

Corrosion Rate, Mils Per Year

Temperature, °F 750 932 1076 1256
Alloy 201 0.9 1.3 2.5 37.8
Alloy 400 1.8 5.1 17.6 -
Alloy 600 1.1 2.4 5.1 66.4

INCONEL® and INCOLOY® are registered trademarks of Special Metals (PCC)