Analysis of the unfolded dimensions of S2205 composite plates
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Recently, our company received a batch of pipe fittings made of S2205+Q245R material, with a thickness of 3+10 and a diameter of DN1350. Previously, when working with composite plate cylinders, the expanded dimensions did not vary much, and since they were pipe components, the expanded dimensions were set at 4282, with a 30° external bevel and a 5mm root margin. It was rolled on-site and welded; afterwards, it was found that the perimeter of the cylinder had increased by around 25–30 mm, which caused significant difficulties in manufacturing. I reviewed some literature, and it all states that the actual expanded size is calculated using formulas; the theoretical diameter should be only 5-10 mm smaller, but currently the diameter is around 9 mm. I would like to ask the experts: have you encountered such a problem before? How is the cutting size before rolling addressed?
It’s necessary to standardize the baseline for determining which radius to use before rolling. Should it be aligned by inner diameter, mean diameter, or outer diameter?
It must be measured by the mean diameter before rolling. After rolling, only the outer diameter can be used for conversion.