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Nb-1 Zr Alloy

Due to its excellent fabric-ability and ductility, this material is readily available in all desired mill product forms.

PHYSICAL PROPERTIES
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)
CHEMICAL COMPOSTION
Tungsten: 500 ppm
Halnium: 200 ppm
Tantalum: 1000 ppm
Zirconium: 0.8% 1.2%
Carbon: 200 ppm
Oxygen: 300 ppm
Nitrogen: 100 ppm
Hydrogen: 15 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.
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of 1800º F to 2200º F. Because of the increasing need for better strengths, as technology has advanced, Nb-1Zr has been replaced by alloys such as C-103, which has greater strength and thus improved reliability, but still retains all the desirable characteristics of Nb-1Zr.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.