Nomag - overpressing
- odontometer
- off
- off-center segregation
- off-take
- OG (oxygen converter gas recovery) system
- OG system
- ohm
- ohmmeter
- oil
- oil
- oil country tubular goods
- oil flotation
- oil separator
- oil-gas burner
- olivine
- OLP (Oxygen Lime Powder) process
- OLP process
- one-strand CCM
- Onia-Novalfer-process
- open die
- open pass
- open pass
- open porosity
- open-die forging
- open-hearth charge
- open-hearth process
- open-hearth steelmaking
- open-top housing
- opening
- operating control
- operating rate
- operating time
- operation
- operation technique
- optical density
- optical furnace
- optical image
- optical spectra
- optical visual inspection
- order
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