Heat treatment issues related to cold forming recovery properties
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GB150 stipulates that for cold-formed carbon steel and low-alloy steel pressure components, heat treatment to restore their properties is required when the deformation rate exceeds 5%. However, the standard does not specify the exact parameters for such heat treatment. How can container manufacturing companies determine the heat treatment temperature and holding time? :'(
Personally, I think the experts in the drafting team have made this rule too theoretical, lacking practical applicability!
How do fellow sailors handle such problems? Please give some guidance. Thank you!
It does not exceed the required value, so only stress-relief annealing is necessary. If it exceeds the required value, normalizing or normalizing followed by tempering is necessary, depending on the material.
Thank you, but is your answer based on any evidence? Is it an answer from the Rights and Equality Commission?
Hello, we are dealing with Q345R material (normalized). The cold-formed head has exceeded the required deformation rate; how should heat treatment be carried out to restore its properties? Is re-tempering necessary?
This post was last edited by zhangjuhua on 2016-9-27 at 23:49. The temperature at which stress relief can restore mechanical properties seems to be lower; stress relief treatment cannot be carried out if the deformation rate exceeds the specified value
Re-normalizing definitely poses no problem; in the case of not normalizing, as long as the deformation is within limits. The standards are a bit vague.
Does a cold-formed head require heat treatment? The head standards do not specify the deformation rate...
If the deformation rate is exceeded, your head is likely to be very small; the problem with normalizing is not significant, and the cost is not high either – only performance tests need to be conducted.