SHIM. A thin piece of material placed between two surfaces to obtain a proper fit, adjustment, or alignment. The piece can also be analyzed to measure furnace carbon potential (that is, because while in the furnace it will quickly carburize to a level equal to the furnace carbon potential).
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TOUGHNESS. The ability of a metal to absorb energy and deform plastically before fracturing.
SHAKER-HEARTH FURNACE. A continuous type furnace that uses a reciprocating shaker motion to move the parts along the hearth.
SUPERCOOLING. Cooling below the temperature at which an equilibrium phase transformation can take place, without actually obtaining the transformation.
SNAP TEMPER. A precautionary interim stress-relieving treatment applied to high-hardenability steels immediately after quenching to prevent cracking because of delay in tempering them […]