Glossary
A glossary of terms relating to alloys, their properties, and the processes used in metallurgy.

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Term Definition
HardnessResistance to plastic deformation, usually by indentation.
 
Hardness, BrinellBrinell hardness of aluminum alloys is obtained by measuring the permanent impression in the material made by a ball indenter lo millimeters in diameter after applying a load of 500 kilograms for 30 seconds and dividing the applied load by the area of the impression.
 
Heat Treatment

Heating and cooling a solid metal or alloy in such a way as to obtain desired conditions or properties. Commonly used as a shop term to denote a thermal treatment to increase strength. Heating for the sole purpose of hot working is excluded from the meaning of this definition.

See our encyclopedia page on Heat Treatment for more information.

 
Heat-Exchanger TubeA tube for use in apparatus in which fluid inside the tube will be heated or cooled by fluid outside the tube. The term usually is not applied to coiled tubes or to tubes for use in refrigerators or radiators.
 
Heat-Treat StainA discoloration due to oxidation of the metal surface during thermal treatment.
 
Heat-Treatable AlloyAn alloy which may be strengthened by a suitable thermal treatment.
 
Herringbone StreaksElongated alternate bright and dull markings at an angle to the rolling direction and having the appearance of a herringbone pattern.
 
HomogenizingA high temperature soaking treatment to eliminate or reduce segregation by diffusion.
 
Hot WorkingPlastic deformation of metal at such temperature and rate that strain hardening does not occur.
 


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