Is heat treatment required for the skirt of the tower?
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There is currently a piece of equipment whose tower is made of S30408 (δ54mm) with a diameter of DN2900. The skirt portion has a conical structure, made of Q345C material with a thickness of 34mm; the foundation ring plate has a thickness of 50mm. The drawings do not specify any heat treatment requirements for the skirt portion. In my opinion, given the material used, its thickness, and the welding processes involved, significant welding stresses will arise after welding. If these welding stresses are not effectively reduced, various instability issues may occur during future use. Therefore, I believe that stress-relief heat treatment should be applied to the skirt portion. What do you all think?
The thickness of the skirt seat material is 34 mm; no heat treatment is required as long as the weld joint is preheated to above 100 °C before welding.
This post was last edited by Gusixicun on 2018-11-2 at 16:59. This is a screenshot from GB150-2011, provided for your reference :)