Ferritic steel can't through strengthening heat treatment.To eliminate because of cold plastic deformation caused by machining and welding stress, can be conducted in 650 ~ 830 ℃ annealing treatment, rapid cooling after annealing, so as to rapidly after 475 ℃ brittle temperature range.USES mostly austenitic antioxidant steel high temperature solid solution heat treatment, in order to obtain good cold deformation.Austenite body strong steel with high temperature solid solution treatment first, and then used in above 60 ~ 100 ℃ temperature conditions aging treatment, make the organization stabilization, the second phase precipitation at the same time, to strengthen the matrix.Heat resistant cast steel is used in the as-cast more, there are also using the corresponding heat treatment according to the types of heat resistant steel.