Nb-1 Zr Alloy

It was discovered that the addition of 1% zirconium to niobium greatly improved the creep strength over the soft pure metal. Thus Nb-1Zr became the replacement for pure niobium in applications requiring the chemical resistance of niobium and a material with high melting temperature. In addition to greatly increasing the strength of pure niobium at higher temperatures, Nb-1Zr also has low thermal nuclear capture cross-section properties. Therefore, this alloy has been closely associated with the nuclear industry, which requires specified elevated temperature strength in the range of 1800º F to 2200º F. Because of the increasing need for better strengths, as technology has advanced, Nb-1Zr has been replaced by alloys such as C-103, which has greater strength and thus improved reliability, but still retains all the desirable characteristics of Nb-1Zr. Nb-1Zr has the advantage of being less expensive than the higher strength alloys, and can be used in applications where a high temperature material is needed with low loads such as a load free thermal shield. Due to the excellent fabricability and ductility, this material is readily available in all desired mill product forms.

PHYSICAL PROPERTIES of Nb-1Zr

Density 0.31 lbs./cu. in. or 8.57 gms./cu. cm.
Melting Point 4365 ± 15ºF or 2410 ± 10ºC
Thermal Conductivity 24.2 BTu/(hr.) (ft.)2 (ºF/ft.) (25ºC)

Nb-1Zr Chemical Composition

Tungsten500 ppm
Halnium200 ppm
Tantalum1000 ppm
Zirconium0.8% 1.2%
Carbon200 ppm
Oxygen300 ppm
Nitrogen100 ppm
Hydrogen15 ppm

Portions of the information are copyrighted by ATI Wah Chang and are reproduced here by Metal
Technology with the permission of ATI Wah Chang, Albany, Oregon 97321.

   
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