How are the metallic materials classified for industrial products divided? Including their scope of application? I'd like to ask for some guidance.

Metallurgical industry classification: ferrous metals: iron, chromium, manganese three Non-ferrous metals: aluminum, magnesium, potassium, sodium, calcium, strontium, barium, copper, lead, zinc, tin, cobalt, nickel, antimony, mercury, cadmium, bismuth, gold, silver, platinum, ruthenium, rhodium, palladium, osmium, iridium, beryllium, lithium, rubidium, cesium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, tungsten, molybdenum, gallium, indium, thallium, germanium, rhenium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium, and thorium.

Metals can also be divided into: neodymium metal

Common metals: such as iron, aluminum, copper, zinc, etc. Rare metals: such as zirconium, hafnium, niobium, tantalum, etc.;

1. Light metals. Density less than 4500 kg/m3, such as aluminum, magnesium, potassium, sodium, calcium, strontium, barium and so on. 2.Heavy metals. Density greater than 4500 kg/m3, such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury and so on. 3. Precious metals. More expensive than commonly used metals, low abundance in the earth's crust, purification difficulties, such as gold, silver and platinum group metals. 4. Quasi-metallic elements. The nature of the price of metal and non-metal, such as silicon, selenium, tellurium, arsenic, boron and so on. 5. Rare metals. Including rare light metals, such as lithium, rubidium, cesium, etc.; 6. rare refractory metals, such as titanium, zirconium, molybdenum, tungsten, etc.; 7. rare dispersed metals, such as gallium, indium, germanium, thallium, etc.; 8. rare earth metals such as scandium, yttrium, lanthanide metals; 9. radioactive metals such as radium, francium, polonium, and uranium in the a-system elements, thorium, etc.