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Machinability- the capacity of a metal to be easily machined.

Manganese- Chemical Symbol Mn, Manganese is a reddy white metal found in most steels.  It's presence deoxidises and also gives strength and responsiveness in heat treatment.  Normally only makes up a very small percentage of an alloys composition (0.5-2%) but some speciality steels contain between 10 and 15%.

Macrostructure- the structure of a metal as revealed under macrograph.

Malleability- determines the ease of forming of a metal when subject to rolling or hammering.  The more malleable the metal, the easier it is to form.

Martensite- a solid solution of iron (Fe)  containing up to 1% Carbon (C), formed when steel is cooled so rapidly that the change from austenite to pearlite is suppressed.

Mechanical Properties- a generic term given to the qualities of a material which indicate its elasticity (or inelasticity) when force is applied- such as hardness, tensile strength, modulus of elasticity etc.

Melting Range- the range of temperature from which a metal begins to melt until it is completely molten.

Metal- one of a number of chemical elements, normally shiny reflective solids,  which are good heat and electricity conductors.

Microstructure- the surface structure of a metal as viewed under a microscope (of magnification more than ten diameters)

Mild Steel- a steel containing less than 0.15% C (Carbon)

Mold- a vessel or cavity into which liquid or semi-liquid metal is poured and cooled to form a desired shape.

Molybdenum- Chemical Symbol Mo, a hard, grayish white , when alloyed in steels increases toughness and hardness of the steel, and helps resist softening at high temperatures.  Can also increase corrosion resistance in stainless steels.

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