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Hotel Door Lock
Oct 29, 2018

Hotel Door Lock

Basic knowledge of metal materials

Overview

The metal material refers to a metal element or a material having a metal property mainly composed 

of a metal element. Including pure metals, alloys, metal materials intermetallic compounds and 

special metal materials. (Note: Metal oxides (such as alumina) are not metal materials)


1. Meaning

The development of human civilization and the improvement of society are closely related to metal 

materials. After the Stone Age, the Bronze Age and the Iron Age were all marked by the application 

of metal materials. Modern, a wide variety of metal materials has become an important material 

basis for the development of human society.


2. Type

Metal materials are usually classified into black metal, non-ferrous metals and special metal 

materials.

(1) Black metal, also known as steel material, includes industrial pure iron containing more than 

90% of iron, cast iron containing 2% to 4% carbon, carbon steel containing less than 2% carbon, 

and structural steel and stainless steel for various purposes. , heat-resistant steel, high-temperature 

alloy, stainless steel, precision alloys, etc. The broad black metal also includes chromium, 

manganese and their alloys.

(2) Non-ferrous metals refer to all metals and their alloys other than iron, chromium and 

manganese. They are usually classified into light metals, heavy metals, precious metals, 

semi-metals, rare metals and rare earth metals. Non-ferrous alloys generally have higher strength 

and hardness than pure metals, and have large electrical resistance and small temperature 

coefficient of resistance.

(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.

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    Address: No.1 Dongsan RD, Xinlian Industrial Area, Lishui Town, Nanhai District, Foshan City, Guangdong Province, China
    Mob: +86-13826111091
    Tel: +86-757-85619957
    Fax: +86-757-85619955

    Email: hyh5@china-hyh.com


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