How about the spheroidizing annealing process of mold stainless steel?
There are several spheroidizing annealing methods for mold stainless steel: heating the steel to a temperature slightly lower than A1 for a long time. This method is mainly used for spheroidizing steel after quenching or cold working. Heat the steel to be slightly higher than A1 for a period of time, then cool to lower than A1 for heat preservation, then warm to the first heating temperature, and then cool to slightly lower than A1.
repeated for many times, the Carbide on the grain boundary in the steel and the cementite in the pearlite are dissolved, re-precipitated and aggregated to achieve the goal of spheroidization. It is recommended to use a small furnace that is easy to control the temperature. This method is suitable for pearlite steel. Heat the steel to be slightly higher than Acm to dissolve all carbides, and then quickly cool to prevent reticular carbides from precipitating until it is slightly lower than A1 and keep warm for a long time.
The stainless steel ball manufacturer heats the steel slightly higher than A1, keeps it warm, then cools it to slightly lower than A1 and keeps it warm for a long time. Heat the steel to slightly higher than Acm to completely dissolve the reticular carbide, and then quickly cool to a lower temperature. The steel is then reheated to a slightly lower temperature than A1. 5th)This method is similar, only 2nd is used for spheroidization)Method.
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