stri - surf
- substrate
- substructural strengthening
- subsurface corrosion
- subsurface ladling
- subsurface pinholes
- subsurface porosity
- subversive gas
- subversive liquid
- subzero hardening
- subzero treatment
- succession of passes
- successive work expansion
- sucking
- sucking socket
- suction
- suction basket
- suction casting
- suction cup
- suction cups
- suction fan
- suction filter
- suction flue
- suction gas producer
- suction hose
- suction lift
- suction manifold
- suction output
- suction pyrometer
- suction wheel compartment
- suction-cup lifting device
- sudden alternation of cross-section
- sudden drop in pressure
- sudden heating
- suds
- suds pump
- suffix number
- sulfate
- sulfidation
- sulfide stress cracking
- sulfidizing