Definitions for "critical temperature"
A certain temperature, different for different gases, but always the same for each gas, regarded as the temperature above which no amount of pressure can produce condensation to a liquid; the temperature above which a gas cannot be liquified.
The highest temperature at which well-defined liquid and vapor states exist.
Above this temperature the steel crystal structure changes from Body Centered Cubic to Face Centered Cubic. Quenching carbon steel after it has reached this point freezes the steel in its harder Face Centered Cubic state.
Keywords:  peritectic, point
Peritectic Point
Crosshead assembly Crosshead compressor