In order to make the high manganese steel lining plate under uniform temperature in low temperature stage, to prevent the crack of excessive thermal stress in the heating process, the larger wall thickness or shape complex lining, generally during the period of 600 ~ 700 ℃ heat preservation should be 1 ~ 2 hours.
But in this temperature range, high manganese steel lining board organization transformation, there will be a major is a large amount of carbide precipitation and coarsening, although these carbide at high temperatures will back into austenite, but because of the carbide and worse than the volume of austenite and rejoined carbide area will appear microporosity, reduce the mechanical properties of high manganese steel lining plate, therefore, for the wall thickness is small and simple structure of the high manganese steel lining board, suggest to cancel midway through heating insulation; Whether large or complex pieces are cancelled remains to be studied. In the case of non - canceling, it is necessary to shorten the heat preservation time by using the liner.
