Zirconium

Ideal for specialized chemical environments (primarily acetic and hydrochloric acids), Zirconium and its alloys provide extreme corrosion resistance. Because it performs well in superheated water and it’s transparent to thermal neutrons, zirconium has been used since the 1950s as cladding for nuclear fuels. Although it’s still used in water-cooled nuclear reactors, the list of beneficial applications for zirconium and its alloys continues to grow. The material is also used in the chemical processing industry for flashbulbs and incendiary ordnance, as well as gettering material in sealed vacuum devices. It’s also useful for construction materials.

United Titanium carries two common grades – 702 and 705. As a commercially pure grade, zirconium 702 offers excellent corrosion protection with resistance to stress-corrosion cracking and crevice corrosion. It’s often used for chemical processing. Alloyed with 2 to 3 percent Columbium, zirconium 705 is significantly stronger and more ductile than zirconium 702 with almost equal corrosion resistance, making it the alloy of choice for most zirconium fasteners.

Resistant to corrosion in most organic and mineral acids, alkalis, and some molten salts, zirconium gets its protection from a critical oxide layer produced on the surface by heat treatment. Other than the natural regeneration of oxide that occurs when oxygen is present, zirconium oxide can be formed or enhanced by anodizing or by heating in air, water, or steam. To provide the most enhanced oxide layer on machined parts, especially on threaded fasteners, it’s crucial that these parts are heat treated to specific parameters.

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  • Zirconium 702

    Zirconium 702 is a commercially pure Zirconium. Zirconium is a reactive metal that has a high affinity for oxygen resulting in the formation of a protective oxide layer in air at room temperature. This protective oxide gives Zirconium alloys their superior corrosion resistance. 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 restance in certain aggressive environments.                        

    Zirconium alloys exhibit good ductility even at cryogenic temperatures and good strength comparable with other common engineering alloys.

  • Zirconium 705

    Zirconium 705 is alloyed with Niobium to increase its strength and improve its formability. Zirconium is a reactive metal that has a high affinity for oxygen resulting in the formation of a protective oxide layer in air at room temperature. This protective oxide gives Zirconium alloys their superior corrosion resistance.    

    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 restance in certain aggressive environments.

    Zirconium alloys exhibit good ductility even at cryogenic temperatures and good strength comparable with other common engineering alloys. 

Specifications

Zirconium Mechanical Properties

Common Name UTS (ksi) YS (ksi) EI (%) Ra (%)
  min. min. min. min.
Z702 55 30 16 -
Z705 80 55 16 -

Zirconium 702 Material Specifications

ASTM B493 and B55 Rod (Bar)
ASME SB493 and SB550 Rod (Bar) 
ASTM SB551 Plate, Sheet and Strip
ASME SB551 Plate, Sheet and Strip
ASTM B658 Pipe
ASME SB658 Pipe
ASTM B523 Tube
ASME SB523 Tube
ASTM/ASME  B/SB653 Fittings

Zirconium 705 Material Specifications

ASTM B493 and B550 Rod (Bar)
ASME SB493 and SB550 Rod (Bar)