It has been observed that 2.25 Cr1 Mo steel specimens subjected to a simulated HAZ thermal cycle with a peak temperature of 1000C exhibit intragranular cracking when reheated to 500700C under strain. However, under the same testing conditions the same specimens subjected to a simulated thermal cycle with a 1350C peak temperature exhibit intergranular cracking typical of reheat cracking. Comment on these observations from the viewpoint of grain growth and carbide dissolution at high temperatures and carbide reprecipitation during reheating.