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Hafnium is a rare transition metal that has a silvery color and luster. Powdered dark grey. Refers to strong and refractory, becomes liquid at 2233 °C. Thanks to the oxide film, it is quite inert, resistant to acids on a par with glass, and has a water-repellent property. In its pure form, this metal is characterized by good ductility and high ductility to machining.
Zirconium is a gray transition metal with a silvery sheen. Plastic. It melts at 1855 °C, in powder form it is capable of self-ignition at ordinary temperatures. Refers to paramagnets. It is resistant to corrosion, radiation, is immune to alkali solutions, sulfuric (up to 50%) and hydrochloric acids.
Molybdenum is a soft transition metal that has a light silvery color and a bright sheen when cut. Refers to rare elements found in minerals and sea water. Its amount in the earth’s crust does not exceed 0.0003% by weight.
Iron-based alloys are called special, having special properties due to alloying with various chemical elements or special processing.
They may be:
Stainless.
Heat resistant and heat resistant.
Wear resistant, etc.
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