Aberration
Absolute temperature
Absorber
Absorption
ACR-process
Activation energy
Additional charging
Additions
Adsorption
Afterblow
Agglomeration
Agitator
AIS-process
Alloy
Alloyed additions
Alloying
Alloying elements
Alumina
Aluminium
Aluminum ferrosilicon
Alumosilicates
Alundum
Anode
Annealing colors
AOD-process
Apparent density
AP-process
Approximate analysis
Arch
Argon
Armco iron
ASEA-SKF process
Ash
Austenite
Autoclave
Automotive sheet
Autoradiography
Avial
Axial looseness