Heat treatment issues in tube boxes
Thread Content
GB151 stipulates that tube boxes with lateral openings exceeding 1/3 of the cylinder’s inner diameter must undergo heat treatment after welding; so what about nozzles with openings exceeding 1/3 on the head? Is heat treatment also required?
Heat treatment is probably not required for the cover
Those on the head need no heat treatment and do not belong to the lateral category. In this case, we will not perform heat treatment
Reply to 2# d63729386: Thank you. I just don’t understand why heat treatment is applied to the side sections, but not to the end caps; haha
The tube sheet is rolled; excessive openings can lead to stress concentration, but this problem does not occur with end caps, as cold-formed end caps are all subject to heat treatment