Heating treatment issues during the rounding of thick plates
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Is heating always required for rounding thick plates in manufacturing plants? What does the heating curve look like? Then, if the tube section test plate also needs to be heated simultaneously, and if, after one round of straightening, the ellipticity still does not meet the requirements for processing (for machining grooves on a vertical lathe), it becomes necessary to heat one or several of the tube sections; in that case, does the test plate also need to be heated along with the tube sections (assuming that the test plate is not attached to the tube section that needs to be straightened again)? Furthermore, in the case of austenitic stainless steel composite sheets, what adverse effects does such repeated heating have on the composite layer?
It mainly depends on the rolling machine capacity of the pressure vessel manufacturer; if the requirements are met, heating may not be necessary.
Regarding the issue raised by the original poster, it might be useful to refer to the processes involved in hot stamping of end caps; there should be similarities between the two. Additionally, this discussion is based on the assumption that hot-rolled steel plates are being used; if normalized steel plates are used, then normalization treatment is necessary.