P460Q tempering after quenching of reheated P460Q to below the critical temperature Ac1 (heating pearlite to austenite transformation start temperature) to the appropriate temperature, heat preservation for a period of time after cooling in air or water, oil and other medium metal heat treatment process.
Or after quenching P460Q of heating to proper temperature, heat preservation several time, and then slowly or fast cooling. Commonly used to reduce or eliminate the internal stress of quenching P460Q, or reduce the hardness and strength, in order to improve the ductility and toughness.
P460Q should promptly tempering after quenching, through the combination of quenching and tempering, can obtain the required mechanical properties.
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