aluminium alloys - auxiliary tuyere
- assay
- assaying
- Assel mill (elongator)
- assembling die
- assembly
- associated (casinghead) gas
- associated flow rule
- associated gas
- astatium
- At
- atmosphere
- atmospheric corrosion
- atmospheric valve
- atom
- atomic nucleii activation
- atomic nucleus
- atomic plane
- atomization
- atomized powders
- attritor
- Au
- Auger effect
- Auger electron
- Auger microscope
- Auger spectrometer
- Auger spectroscopy
- ausforming
- austempering
- austenite
- austenite stabilization
- austenitic cast iron
- autoclave
- autoclave process
- autogenous furnace
- autogenous grinding
- autogenous grinding
- autogenous process
- autogenous smelting
- automatic (plug, plug-rolling, high) mill
- automatic control
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