Zirconium 702

Zirconium 702 has excellent thermal conductivity, corrosion resistant, and is inert to all organic and inorganic substances. Its qualities make it the perfect substance for corrosion-resistant process equipment. Any piece of process equipment where corrosion is a concern should be given zirconium consideration due to its long-term advantages of decreased downtime, greater life expectancy, and profitability.

Zirconium is widely recognized for its resistance to pitting and crevice corrosion as well as its immunity to stress corrosion cracking. At ambient temperature, a protective oxide layer forms on this reactive metal because of its high affinity for oxygen.

Zirconium offers excellent corrosion resistance to:

  • Reducing environments
  • All chlorides except ferric & cupric
  • Hydrochloride & sulfuric acids below 70% concentration
  • Phosphoric, nitric acids & alkaline solutions


It has poor resistance to oxidizing agents

Chemical Composition:

Element Percentage
Zirconium ( Zr ) 95.5%
Hafnium ( Hf ) 4.5%
Iron ( Fe ) + Chromium ( Cr ) 0.2%
Nitrogen 0.025%

Corrosion Rating:

RATINGS - 0:Unsuitable 1:Poor to Fair 2:Fair 3:Fair to good 4:Good 5:Good to Excellent 6:Normally Excellent

Materials Non-oxidizing or reducing media Liquids Gases
Acid solutions excluding Hydrochloric, phosphoric, sulfuric Neutral solutions, e.g. many Non-oxidizing salt solutions, chlorides, sulfates Alkaline solutions Oxidizing Media Halogen & derivatives
Caustic & mild alkalis, excluding ammonium hydroxide Ammonium hydroxide & amines Acid solutions, e.g. nitric Neutral or alkaline solutions e.g. per sulfates, peroxides, chromates Pitting media, acid ferric chloride solutions Halogen Hydrogen halides, dry, e.g., dry, hydrogen chloride
Moist, e.g. chlorine below dew point Dry, e.g. fluorine above dew point
Zirconium 3 6 2 6 6 6 2 6 1 6

Note: Maximum Design Temperature: 316°C

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