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Zirconium 705 (Zr 705) Pipes & Tubes

Material Description

UNS R60705

Chemical Composition, %

Zr + Ha


Fe + Cr






95.5 min

4.5 max

.2 max

.005 max

.025 max

.05 max


.18 max

Zirconium 705 is zirconium alloyed with niobium to increase its strength and improve its formability

Corrosion Resistance

No metal or alloy is resistant to corrosive attack in all chemical environments. Zirconium is no exception, but it does have excellent resistance to a wide variety of chemicals. Zirconium has outstanding resistance to hydrochloric acid, sulfuric acid, organic acids, and alkaline media such as sodium hydroxide. Its resistance to nitric acid is equalled only by the noble metals such as tantalum. The most common application areas for cast zirconium equipment are in hydrochloric acid, sulfuric acid, and hot organic acids.
Zirconium shows excellent corrosion resistance to all concentrations of hydrochloric acid even at temperatures exceeding the normal boiling point. However, zirconium is not resistant to hydrochloric acid containing oxidizing species such as cupric chloride, ferric chloride, or wet chlorine. Zr 705 is resistant to concentrations up to 55 percent to the normal boiling point of sulfuric acid. Poor resistance is obtained with higher concentrations, even at room temperature. Zirconium is superior to stainless steels, nickel alloys, and titanium in organic acids. This alloy is considered for these applications at high temperatures where its marked superior- ity results in a distinct economic advantage. Zirconium has poor resistance to concentrated sulfuric acid, hydrofluoric acid, concentrated phosphoric acid, ferric chloride, cupric chloride, wet chlorine, and other oxidizing chloride environments.

Seamless Tube Information

Specification: ASTM B-523 / ASME SB-523, ASTM B-658 / ASME SB-658

Outside Diameter: 6.0-114 mm

Wall Thickness: 0.5-15 mm

Length: Max.24000mm (the maximum length is for the scope of special diameters and walls)

Other sizes are on the request