Principal Features

HAYNES® NS-163® alloy is a Co – 28Cr – 21Fe – 8Ni – 1.3Ti – 1Nb alloy produced as wrought sheet, strip and wire material with high creep strength and relatively low density.  Its properties bridge the gap between the capabilities of current solid-solution strengthened alloys and the oxide-dispersion strengthened (ODS) mechanical alloys. HAYNES® NS-163® alloy exhibits good oxidation resistance up to 1800ºF (982ºC), but is capable of being coated for exceptional oxidation resistance at even higher temperatures.

The high level of creep strength in HAYNES® NS-163® alloy is achieved via a unique high-temperature Nitride Dispersion Strengthening (NDS) treatment performed after forming, welding and fabrication is complete.  Unlike other materials of comparable performance, produced by powder metallurgy, HAYNES® NS-163® alloy is conventionally melted (VIM + ESR) and processed (via hot and cold rolling) in the same manner as the solid solution strengthened materials and can be conventionally formed, fabricated and welded into nearly any conceivable shape currently produced in other superalloys.

*Please contact our technical support team if you have technical questions about this alloy.

Nominal Composition

Weight %
Cobalt:  Balance 
Iron:  21 
Chromium:  28 
Manganese:  0.5 max. 
Silicon:  0.5 max. 
Aluminum:  0.5 max. 
Titanium:  1.3 
Carbon:  0.1 
Boron:  0.015 max. 

Heat Treatment

Solution Heat Treatment:

Typical Solution Annealing Temperature: 2100 to 2150°F (1150 to 1177°C) in dry hydrogen.

NDS (Nitride Dispersion Strengthening) Treatment:

NDS treatments have been developed for this alloy.  Please contact Haynes International for more detailed information.

Material Properties (Nitrided)

0.287 lb/in3
7.95 g/cm3
Melting Range 2523 - 2586°F 1382 - 1419°C


Physical Properties (Nitrided)

Temperature Specific Heat Thermal Conductivity Dynamic Modulus of Elasticity Electrical Resistivity Mean Coefficient of Thermal Expansion
(°F) (BTU/lb-°F)
(106 psi)
(µohm-in) (µin/in-°F)
800 0.133 138 31.5 39.5 8.8
1000 0.137 156 27.5 40.9 9
1200 0.146 173 26 42.2 9.3
1400 0.155 190 24.5 43.2 9.6
1600 0.159 203 23.1 44.3 9.8
1800 0.162 212 21.5 45.3 10.1
Temperature Specific Heat Thermal Conductivity Dynamic Modulus of Elasticity Electrical Resistivity Mean Coefficient of Thermal Expansion
(°C) (J/kg-°C) (W/m-°C) (GPa) (µohm-cm) (µm/m-°C)
400 553 19.6 201 99 15.7
500 566 21.1 193 103 16.1
600 584 22.7 184 106 16.5
700 638 26.1 175 108 17
800 654 27.6 165 111 17.4
900 668 28.7 156 113 17.8
1000 681 29.5 146 115 18.1


Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums.  It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.

For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc.  All trademarks are owned by Haynes International, Inc., unless otherwise indicated.

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