Metal materials are usually classified into ferrous metals, non-ferrous metals, and specialty metallic materials.
1. Black metal, also known as steel material, includes industrial pure iron with a total impurity content of <0.2% and a carbon content of not more than 0.0218%, steel with a carbon content of 0.0218% to 2.11%, and cast iron with a carbon content greater than 2.11%. The broad ferrous metals also include chromium, manganese and their alloys.
2. Non-ferrous metals refer to all metals and their alloys except iron, chromium and manganese. They are usually classified into light metals, heavy metals, precious metals, semi-metals, rare metals and rare earth metals. The strength and hardness of colored alloys are generally higher than those of pure metals. And the resistance is large and the temperature coefficient of resistance is small.
3. Special metal materials include structural metal materials and functional metal materials for different purposes. Among them are amorphous metal materials obtained by rapid condensation process, as well as quasi-crystal, microcrystalline, nanocrystalline metal materials, etc.; and special functional alloys such as stealth, hydrogen, superconductivity, shape memory, wear resistance, vibration damping and the like. And metal matrix composite materials.
