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Zirconium is highly ductile and extremely resistant to corrosion and heat. Its symbol in the periodic table is Zr, and its atomic number is 40. It melts at 1855 degrees Celsius (°C) and boils at 4409 °C, and it is not corroded by acids, alkalis or seawater. Zirconium is a very strong, malleable, ductile, lustrous silver-gray metal. Its chemical and physical properties are similar to those of titanium.
Zirconium is a ductile metal and as a fine powder is highly flammable. Zirconium is almost always found paired with the element hafnium (Hf).
Zirconium is regarded as both a reactive and refractory metal because of its high melting point of 1855 °C. However, zirconium is not suitable for high temperature applications because of its reactivity. Zirconium reacts with many metallic and nonmetallic elements at elevated temperatures, that is why zirconium needs a clean surface and argon shielding in welding. Heat treatments may be done in air, but only with a clean surface.
Zr Melting Point: 2128 K, 1855 °C, 3371 °F
Zr Boiling Point: 4409°C 7968 °F
Density: 6.52 g·cm−3
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