Metals

Metal Properties

Mechanical Properties, Physical Properties and Chemical Properties

In large part, the ways of distinguishing metals can be broken down into three categories: mechanical propertiesphysical properties and chemical properties.

Physical properties refer to observable characteristics of a material. Examples of physical properties include color, melting point and density. Mechanical Properties describe how a material reacts to external forces like pushing, pulling or twisting. Strength, hardness and elasticity are examples of mechanical properties.

Chemical properties explain how a material interacts with other materials in a given environment. These properties determine how the material will behave on a molecular level. Chemical properties are the basis for physical and mechanical properties.

Neither physical nor mechanical properties are constant; they change according to the environment. For example, elasticity (mechanical property) and density (physical property) are dependent on material temperature.

Metals are all around us, in the things we use to cook, drive, work, and live. When choosing a metal for a cast product or other specific application, it’s important to make sure that its properties will be suitable for the expected operating conditions.

There’s a big difference between the kind of metal used in a skyscraper and the kind of metal used in a gate valve. Some metals are pure elements, like iron (Fe) and aluminum (Al), but most products are made from alloys, or mixtures of metals. Manufacturers must consider many variables before deciding which alloy to use for a particular product.

Factors that go into choosing the right metal alloy include:

  • Structure,
  • Properties,
  • Processing,
  • Performance, as well as the interrelations between these four factors.