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Zirconium (Zr)

Zirconium - Zr , a reactive metal, has a high affinity for oxygen that results in the formation of a protective oxide layer in air at room temperature. This protective oxide gives Zirconium alloys their superior corrosion resistance and this oxide layer can be enhanced through a heat treating process. A properly formed enhanced oxide layer serves as an excellent bearing surface against a variety of materials, imparts impressive erosion resistance in high velocity systems, and can improve the corrosion resistance in certain aggressive environments.(ref. ATI Wah Chang)

Zirconium alloys are composed of 95.5% to 99.2% zirconium and hafnium with a maximum hafnium content of 4.5%. Zirconium mill products are available in two chemical grades each sharing excellent corrosion resistance and also having slightly different physical and mechanical properties. Zirconium 702 is commercially pure zirconium. Zirconium 705 zirconium is alloyed with niobium to increase its strength and improve its formability. (Zircodyne 702 & Zircodyne 705 are Registered Tradenames of ATI Wahchang.)

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> Zirconium Sheet / Plate > Zirconium Wire > Zirconium Pipe Fittings
> Zirconium Tube > Zirconium Welding Rod / Wire > Zirconium Flanges


Zr 702
UNS R60702
Zr 705
UNS R60705
zirconium 99.2 95.5
hafnium max  4.5 4.5
niobium - 2.0-3.0
Iron + Chromium 0.20 0.20
H max 0.005 0.005
N max 0.025 0.025
C max 0.05 0.05
O max 0.16 0.16
ultimate tensile strength,
 MPa [ksi]
379(55) 552(80)
yeild strength, MPa [ksi] 207(30) 379(55)
elongation, % 16 16

 Zirconium alloys have a thermal conductivity that is more than 30% higher than those of stainless steel alloys making Zirconium alloys ideal for heat exchanger applications. The linear coefficient of thermal expansion of Zirconium alloys is nearly one-third of the value for stainless steel giving Zirconium alloys superior dimensional stability at elevated temperatures.

Gr1, Gr2, Gr3, Gr5(Ti6Al4V), Gr7, Gr9
Zr 702, Zr 705
Pure Unalloyed, 2.5% W + 97.5% Ta Alloy

Nickel Alloys
Inconel, Monel, Invar, Kovar, Hastelloy, Incoloy
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