Issues regarding heat treatment for the recovery properties of Q345R/Q245R head parts after hot stamping
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Premise: 1. A pressure vessel device, made of material Q345R (or Q245R)； 2. The design specifications have no special requirements for the steel plate; hot-rolled condition is sufficient for delivery. Actual situation: There are steel plates in stock that meet the material and specifications specified in the design drawings, but they are in a normalized state upon delivery. Question: Is it necessary to carry out a heat treatment to restore properties after forming the head using these stock steel plates via hot stamping? (i.e., normalizing treatment)
Since the design drawings require hot rolling, it is fine to use stock normalized plates. As for whether performance-restoring heat treatment is required, it depends on the forming method of the head; if it is cold-formed and the degree of deformation exceeds the requirements specified in GB150.4, then performance-restoring heat treatment is necessary, but normalizing is not required.
For cold forming heat treatment, refer to 6.4.5 in 25198