Keywords: quenching, treatment, workpiece, HRC, tissue stress, heat treatment, alternating,

　fine pearlite isothermal quenching is to isothermally austenitize the steel in a hot bath at about 500 ℃, as shown in the figure. as a result of such treatment, the workpiece obtains a fine pearlite structure. (sorbite or troosbite). With high strength, toughness and ductility, hardness between HRC27 ~ 36, due to the transformation of austenite to pearlite is a diffusive transformation, the transformation rate is very slow, and the change of specific volume is not large, it does not cause lattice distortion, so the tissue stress is very small.

　　the so-called padden treatment used in industry for some low alloy steel or high carbon steel spring wires or belts and piano wires is fine pearlite austempering.
　　fine pearlite isothermal quenching can replace the heat treatment of some other parts that need quenching and tempering treatment but do not work under heavy load or alternating load, such as tool holder screws and small taper pins of machine tools.

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